Fixing from review

Bumps golang from 1.18.3 to 1.18.4.

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/codeql.yml

@@ -0,0 +1,70 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ master ]
+  schedule:
+    - cron: '24 3 * * 1'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python', 'ruby' ]
+        # Learn more about CodeQL language support at https://aka.ms/codeql-docs/language-support
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v2
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v2
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v2

.github/workflows/docker-release.yml

@@ -0,0 +1,62 @@
+name: Release Docker
+
+on:
+  release:
+    types: [released]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  publishDocker:
+    environment: dockerhub
+    env:
+      IMAGE_NAME: mikefarah/yq
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+        with:
+          platforms: all
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v2
+        with:
+          version: latest
+
+      - name: Available platforms
+        run: echo ${{ steps.buildx.outputs.platforms }} && docker version
+
+      - name: Build and push image
+        run: |
+          echo "GithubRef: ${GITHUB_REF}"
+          VERSION=${GITHUB_REF##*/}
+          echo "VERSION: ${VERSION}"
+          IMAGE_VERSION=${VERSION:1}
+          echo "IMAGE_VERSION: ${IMAGE_VERSION}"
+
+          PLATFORMS="linux/amd64,linux/ppc64le,linux/arm64"
+
+          echo "Building and pushing version ${IMAGE_VERSION} of image ${IMAGE_NAME}"
+          echo '${{ secrets.DOCKER_PASSWORD }}' | docker login -u '${{ secrets.DOCKER_USERNAME }}' --password-stdin
+          docker buildx build \
+            --label "org.opencontainers.image.authors=https://github.com/mikefarah/yq/graphs/contributors" \
+            --label "org.opencontainers.image.created=$(date --rfc-3339=seconds)" \
+            --label "org.opencontainers.image.description=yq is a portable command-line YAML processor" \
+            --label "org.opencontainers.image.documentation=https://mikefarah.gitbook.io/yq/" \
+            --label "org.opencontainers.image.licenses=MIT" \
+            --label "org.opencontainers.image.revision=$(git rev-parse HEAD)" \
+            --label "org.opencontainers.image.source=https://github.com/mikefarah/yq" \
+            --label "org.opencontainers.image.title=yq" \
+            --label "org.opencontainers.image.url=https://mikefarah.gitbook.io/yq/" \
+            --label "org.opencontainers.image.version=${IMAGE_VERSION}" \
+            --platform "${PLATFORMS}" \
+            --pull \
+            --push \
+            -t "${IMAGE_NAME}:${IMAGE_VERSION}" \
+            -t "${IMAGE_NAME}:4" \
+            -t "${IMAGE_NAME}:latest" \
+            .

.github/workflows/go.yml

@@ -1,5 +1,8 @@
 name: Build
 on: [push, pull_request]
+permissions:
+  contents: read
+
 jobs:
 
   build:
@@ -7,10 +10,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-    - name: Set up Go 1.17
-      uses: actions/setup-go@v2
+    - name: Set up Go 1.18
+      uses: actions/setup-go@v3
       with:
-        go-version: 1.17
+        go-version: 1.18
       id: go
 
     - name: Check out code into the Go module directory

.github/workflows/release.yml

@@ -3,15 +3,16 @@ on:
   push:
     tags:
       - 'v*'
+      - 'draft-*'
 
 jobs:
   publishGitRelease:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - uses: actions/setup-go@v2
+      - uses: actions/setup-go@v3
         with:
-          go-version: '^1.17.5'
+          go-version: '^1.18'
       - name: Compile man page markup
         id: gen-man-page-md
         run: |
@@ -39,72 +40,14 @@ jobs:
       - name: Cross compile
         run: |
           sudo apt-get install rhash -y
-          go get github.com/mitchellh/gox
+          go install github.com/mitchellh/gox@v1.0.1
           mkdir -p build
           cp yq.1 build/yq.1
           ./scripts/xcompile.sh
 
-      - name: Create Release
-        id: create_release
-        uses: actions/create-release@v1.1.4
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Release
+        uses: softprops/action-gh-release@v1
         with:
-          tag_name: ${{ github.ref }}
-          release_name: ${{ github.ref }}
+          files: build/*
           draft: true
-          prerelease: false
-
-      - uses: shogo82148/actions-upload-release-asset@v1
-        with:
-          upload_url: ${{ steps.create_release.outputs.upload_url }}
-          asset_path: build/*
-
-  publishDocker:
-    environment: dockerhub
-    env:
-      IMAGE_NAME: mikefarah/yq
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v1
-        with:
-          platforms: all
-
-      - name: Set up Docker Buildx
-        id: buildx
-        uses: docker/setup-buildx-action@v1
-        with:
-          version: latest
-
-      - name: Available platforms
-        run: echo ${{ steps.buildx.outputs.platforms }} && docker version
-
-      - name: Build and push image
-        run: |
-          IMAGE_V_VERSION="$(git describe --tags --abbrev=0)"
-          IMAGE_VERSION=${IMAGE_V_VERSION:1}
-          PLATFORMS="linux/amd64,linux/ppc64le,linux/arm64"
-
-          echo "Building and pushing version ${IMAGE_VERSION} of image ${IMAGE_NAME}"
-          echo '${{ secrets.DOCKER_PASSWORD }}' | docker login -u '${{ secrets.DOCKER_USERNAME }}' --password-stdin
-          docker buildx build \
-            --label "org.opencontainers.image.authors=https://github.com/mikefarah/yq/graphs/contributors" \
-            --label "org.opencontainers.image.created=$(date --rfc-3339=seconds)" \
-            --label "org.opencontainers.image.description=yq is a portable command-line YAML processor" \
-            --label "org.opencontainers.image.documentation=https://mikefarah.gitbook.io/yq/" \
-            --label "org.opencontainers.image.licenses=MIT" \
-            --label "org.opencontainers.image.revision=$(git rev-parse HEAD)" \
-            --label "org.opencontainers.image.source=https://github.com/mikefarah/yq" \
-            --label "org.opencontainers.image.title=yq" \
-            --label "org.opencontainers.image.url=https://mikefarah.gitbook.io/yq/" \
-            --label "org.opencontainers.image.version=${IMAGE_VERSION}" \
-            --platform "${PLATFORMS}" \
-            --pull \
-            --push \
-            -t "${IMAGE_NAME}:${IMAGE_VERSION}" \
-            -t "${IMAGE_NAME}:4" \
-            -t "${IMAGE_NAME}:latest" \
-            .
+          fail_on_unmatched_files: true

.github/workflows/test-yq.yml

@@ -1,5 +1,8 @@
 name: Test Yq Action
 on: [push]
+permissions:
+  contents: read
+
 jobs:
 
   build:

.gitignore

@@ -41,6 +41,7 @@ yq*.snap
 
 test.yml
 test*.yml
+test*.yaml
 0.yml
 1.yml
 2.yml
@@ -53,3 +54,6 @@ yq.1
 # debian pkg
 _build
 debian/files
+
+# intellij
+/.idea

CONTRIBUTING.md

@@ -1,3 +1,5 @@
+# Development
+
 1. Install (golang)[https://golang.org/]
 1. Run  `scripts/devtools.sh` to install the required devtools
 2. Run `make [local] vendor` to install the vendor dependencies
@@ -6,3 +8,33 @@
 4. Make the code changes.
 5. `make [local] test` to lint code and run tests
 6. Profit! ok no profit, but raise a PR and get kudos :)
+
+
+# Documentation
+
+The documentation is a bit of a mixed bag (sorry in advanced, I do plan on simplifying it...) - with some parts automatically generated and stiched together and some statically defined.
+
+Documentation is written in markdown, and is published in the 'gitbook' branch.
+
+The various operator documentation (e.g. 'strings') are generated from the 'master' branch, and have a statically defined header (e.g. `pkg/yqlib/doc/operators/headers/add.md`) and the bulk of the docs are generated from the unit tests e.g. `pkg/yqlib/operator_add_test.go`.
+
+The pipeline will run the tests and automatically concatenate the files together, and put them under 
+`pkg/qylib/doc/add.md`. These files are checked in the master branch (and are copied to the gitbook branch as part of the release process).
+
+## How to contribute
+
+The first step is to find if what you want is automatically generated or not - start by looking in the master branch. 
+
+### Updating dynamic documentation from master
+- Search for the documentation you want to update. If you find matches in a `*_test.go` file - update that, as that will automatically update the matching `*.md` file 
+- Assuming you are updating a `*_test.go` file, once updated, run the test to regenerated the docs. E.g. for the 'Add' test generated docs, from the pkg/yqlib folder run:
+`go test -run TestAddOperatorScenarios` which will run that test defined in the `operator_add_test.go` file.
+- Ensure the tests still pass, and check the generated documentation have your update.
+- Note: If the documentation is only in a `headers/*.md` file, then just update that directly
+- Raise a PR to merge the changes into master!
+
+### Updating static documentation from the gitbook branch
+If you haven't found what you want to update in the master branch, then check the gitbook branch directly as there are a few pages in there that are not in master.
+
+- Update the `*.md` files
+- Raise a PR to merge the changes into gitbook.

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.17 as builder
+FROM golang:1.18.4 as builder
 
 WORKDIR /go/src/mikefarah/yq
 

Dockerfile.dev

@@ -1,4 +1,4 @@
-FROM golang:1.17
+FROM golang:1.18.4
 
 COPY scripts/devtools.sh /opt/devtools.sh
 

README.md

@@ -1,6 +1,6 @@
 # yq
 
-![Build](https://github.com/mikefarah/yq/workflows/Build/badge.svg)  ![Docker Pulls](https://img.shields.io/docker/pulls/mikefarah/yq.svg) ![Github Releases (by Release)](https://img.shields.io/github/downloads/mikefarah/yq/total.svg) ![Go Report](https://goreportcard.com/badge/github.com/mikefarah/yq)
+![Build](https://github.com/mikefarah/yq/workflows/Build/badge.svg)  ![Docker Pulls](https://img.shields.io/docker/pulls/mikefarah/yq.svg) ![Github Releases (by Release)](https://img.shields.io/github/downloads/mikefarah/yq/total.svg) ![Go Report](https://goreportcard.com/badge/github.com/mikefarah/yq) ![CodeQL](https://github.com/mikefarah/yq/workflows/CodeQL/badge.svg)
 
 
 a lightweight and portable command-line YAML, JSON and XML processor. `yq` uses [jq](https://github.com/stedolan/jq) like syntax but works with yaml files as well as json and xml. It doesn't yet support everything `jq` does - but it does support the most common operations and functions, and more is being added continuously.
@@ -18,21 +18,18 @@ TLDR:
 
 Prior to 4.18.1 
 ```bash
-cat file.yaml | yq e '.cool' -
+yq e '.cool' - < file.yaml
 ```
 
 4.18+ 
 ```bash
-cat file.yaml | yq '.cool'
+yq '.cool' < file.yaml
 ```
 
 When merging multiple files together, `eval-all/ea` is still required to tell `yq` to run the expression against all the document at once.
 
 ## Quick Usage Guide
 
-
-
-
 Read a value:
 ```bash
 yq '.a.b[0].c' file.yaml
@@ -40,7 +37,7 @@ yq '.a.b[0].c' file.yaml
 
 Pipe from STDIN:
 ```bash
-cat file.yaml | yq '.a.b[0].c'
+yq '.a.b[0].c' < file.yaml
 ```
 
 Update a yaml file, inplace
@@ -60,7 +57,6 @@ Merge multiple files
 yq ea '. as $item ireduce ({}; . * $item )' path/to/*.yml
 ```
 
-
 Multiple updates to a yaml file
 ```bash
 yq -i '
@@ -70,7 +66,12 @@ yq -i '
 ' file.yaml
 ```
 
-See the [documentation](https://mikefarah.gitbook.io/yq/) for more.
+Convert JSON to YAML
+```bash
+yq -P sample.json
+```
+
+See the [documentation](https://mikefarah.gitbook.io/yq/) for more examples.
 
 ## Install
 
@@ -142,11 +143,11 @@ podman run --rm -v "${PWD}":/workdir mikefarah/yq [command] [flags] [expression
 You'll need to pass the `-i\--interactive` flag to docker:
 
 ```bash
-cat myfile.yml | docker run -i --rm mikefarah/yq '.this.thing'
+docker run -i --rm mikefarah/yq '.this.thing' < myfile.yml
 ```
 
 ```bash
-cat myfile.yml | podman run -i --rm mikefarah/yq '.this.thing'
+podman run -i --rm mikefarah/yq '.this.thing' < myfile.yml
 ```
 
 #### Run commands interactively:
@@ -172,8 +173,6 @@ yq() {
   podman run --rm -i -v "${PWD}":/workdir mikefarah/yq "$@"
 }
 ```
-
-
 #### Running as root:
 
 `yq`'s container image no longer runs under root (https://github.com/mikefarah/yq/pull/860). If you'd like to install more things in the container image, or you're having permissions issues when attempting to read/write files you'll need to either:
@@ -208,7 +207,6 @@ RUN apk add --no-cache tzdata
 USER yq
 ```
 
-
 ### GitHub Action
 ```
   - name: Set foobar to cool
@@ -219,9 +217,9 @@ USER yq
 
 See https://mikefarah.gitbook.io/yq/usage/github-action for more.
 
-### Go Get:
+### Go Install:
 ```
-GO111MODULE=on go get github.com/mikefarah/yq/v4
+go install github.com/mikefarah/yq/v4@latest
 ```
 
 ## Community Supported Installation methods
@@ -312,7 +310,7 @@ Usage:
 Examples:
 
 # yq defaults to 'eval' command if no command is specified. See "yq eval --help" for more examples.
-cat myfile.yml | yq '.stuff' # outputs the data at the "stuff" node from "myfile.yml"
+yq '.stuff' < myfile.yml # outputs the data at the "stuff" node from "myfile.yml"
 
 yq -i '.stuff = "foo"' myfile.yml # update myfile.yml inplace
 

acceptance_tests/basic.sh

@@ -12,6 +12,62 @@ testBasicEvalRoundTrip() {
   assertEquals 123 "$X"
 }
 
+testBasicTrailingContent() {
+  cat >test-trailing.yml <<EOL
+test:
+# this comment will be removed
+EOL
+
+  read -r -d '' expected << EOM
+test:
+# this comment will be removed
+EOM
+  X=$(./yq test-trailing.yml -P)
+  assertEquals "$expected" "$X"
+}
+
+testBasicTrailingContent() {
+  cat >test-trailing.yml <<EOL
+test:
+# this comment will be removed
+EOL
+
+  read -r -d '' expected << EOM
+test:
+# hi
+EOM
+  X=$(./yq '. footComment = "hi"' test-trailing.yml)
+  assertEquals "$expected" "$X"
+}
+
+testBasicTrailingContentEvalAll() {
+  cat >test-trailing.yml <<EOL
+test:
+# this comment will be removed
+EOL
+
+  read -r -d '' expected << EOM
+test:
+# this comment will be removed
+EOM
+  X=$(./yq ea test-trailing.yml -P)
+  assertEquals "$expected" "$X"
+}
+
+testBasicTrailingContentEvalAll() {
+  cat >test-trailing.yml <<EOL
+test:
+# this comment will be removed
+EOL
+
+  read -r -d '' expected << EOM
+test:
+# hi
+EOM
+  X=$(./yq ea '. footComment = "hi"' test-trailing.yml)
+  assertEquals "$expected" "$X"
+}
+
 testBasicPipeWithDot() {
   ./yq -n ".a = 123" > test.yml
   X=$(cat test.yml | ./yq '.')
@@ -86,6 +142,12 @@ testBasicCatWithFilesNoDash() {
   assertEquals "$Y" "$X"
 }
 
+# when the nullinput flag is used
+# dont automatically read STDIN (this breaks github actions)
+testBasicCreateFileGithubAction() {
+  cat /dev/null | ./yq -n ".a = 123" > test.yml
+}
+
 testBasicEvalAllCatWithFilesNoDash() {
   ./yq -n ".a = 123" > test.yml
   ./yq -n ".a = 124" > test2.yml
@@ -188,6 +250,40 @@ EOL
   assertEquals "10" "$X"
 }
 
+testBasicUpdateInPlaceMultipleFilesNoExpressionEval() {
+  cat >test.yml <<EOL
+a: 0
+EOL
+  cat >test2.yml <<EOL
+a: 1
+EOL
+read -r -d '' expected << EOM
+0
+---
+1
+EOM
+  ./yq -i test.yml test2.yml
+  X=$(./yq e '.a' test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testBasicUpdateInPlaceMultipleFilesNoExpressionEvalAll() {
+  cat >test.yml <<EOL
+a: 0
+EOL
+  cat >test2.yml <<EOL
+a: 1
+EOL
+read -r -d '' expected << EOM
+0
+---
+1
+EOM
+  ./yq -i ea test.yml test2.yml
+  X=$(./yq e '.a' test.yml)
+  assertEquals "$expected" "$X"
+}
+
 testBasicNoExitStatus() {
   echo "a: cat" > test.yml
   X=$(./yq e '.z' test.yml)
@@ -235,4 +331,26 @@ EOM
   assertEquals "$expected" "$X"
 }
 
+testBasicMultiplyAssignMultiDoc() {
+      cat >test.yml <<EOL
+a: 1
+---
+b: 2
+EOL
+
+read -r -d '' expected << EOM
+a: 1
+c: 3
+---
+b: 2
+c: 3
+EOM
+
+
+  X=$(./yq '. *= {"c":3}' test.yml)
+  assertEquals "$expected" "$X"
+}
+
+
+
 source ./scripts/shunit2

acceptance_tests/inputs-format.sh

@@ -3,6 +3,8 @@
 setUp() {
   rm test*.yml 2>/dev/null || true
   rm test*.properties 2>/dev/null || true
+  rm test*.csv 2>/dev/null || true
+  rm test*.tsv 2>/dev/null || true
   rm test*.xml 2>/dev/null || true
 }
 
@@ -40,6 +42,51 @@ EOM
   assertEquals "$expected" "$X"
 }
 
+testInputCSV() {
+  cat >test.csv <<EOL
+fruit,yumLevel
+apple,5
+banana,4
+EOL
+
+  read -r -d '' expected << EOM
+- fruit: apple
+  yumLevel: 5
+- fruit: banana
+  yumLevel: 4
+EOM
+
+  X=$(./yq e -p=csv test.csv)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=csv test.csv)
+  assertEquals "$expected" "$X"
+}
+
+testInputTSV() {
+  cat >test.tsv <<EOL
+fruit	yumLevel
+apple	5
+banana	4
+EOL
+
+  read -r -d '' expected << EOM
+- fruit: apple
+  yumLevel: 5
+- fruit: banana
+  yumLevel: 4
+EOM
+
+  X=$(./yq e -p=t test.tsv)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=t test.tsv)
+  assertEquals "$expected" "$X"
+}
+
+
+
+
 testInputXml() {
   cat >test.yml <<EOL
 <cat legs="4">BiBi</cat>
@@ -58,6 +105,48 @@ EOM
   assertEquals "$expected" "$X"
 }
 
+testInputXmlNamespaces() {
+  cat >test.yml <<EOL
+<?xml version="1.0"?>
+<map xmlns="some-namespace" xmlns:xsi="some-instance" xsi:schemaLocation="some-url">
+</map>
+EOL
+
+  read -r -d '' expected << EOM
+map:
+  +xmlns: some-namespace
+  +xmlns:xsi: some-instance
+  +xsi:schemaLocation: some-url
+EOM
+
+  X=$(./yq e -p=xml test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -p=xml test.yml)
+  assertEquals "$expected" "$X"
+}
+
+
+testInputXmlStrict() {
+  cat >test.yml <<EOL
+<?xml version="1.0"?>
+<!DOCTYPE root [
+<!ENTITY writer "Catherine.">
+<!ENTITY copyright "(r) Great">
+]>
+<root>
+    <item>&writer;&copyright;</item>
+</root>
+EOL
+
+  X=$(./yq -p=xml --xml-strict-mode test.yml 2>&1)
+  assertEquals 1 $?
+  assertEquals "Error: bad file 'test.yml': XML syntax error on line 7: invalid character entity &writer;" "$X"
+
+  X=$(./yq ea -p=xml --xml-strict-mode test.yml 2>&1)
+  assertEquals "Error: bad file 'test.yml': XML syntax error on line 7: invalid character entity &writer;" "$X"
+}
+
 testInputXmlGithubAction() {
   cat >test.yml <<EOL
 <cat legs="4">BiBi</cat>

acceptance_tests/output-format.sh

@@ -102,6 +102,48 @@ EOM
   assertEquals "$expected" "$X"
 }
 
+testOutputCSV() {
+  cat >test.yml <<EOL
+- fruit: apple
+  yumLevel: 5
+- fruit: banana
+  yumLevel: 4
+EOL
+
+  read -r -d '' expected << EOM
+fruit,yumLevel
+apple,5
+banana,4
+EOM
+
+  X=$(./yq -o=c test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -o=csv test.yml)
+  assertEquals "$expected" "$X"
+}
+
+testOutputTSV() {
+  cat >test.yml <<EOL
+- fruit: apple
+  yumLevel: 5
+- fruit: banana
+  yumLevel: 4
+EOL
+
+  read -r -d '' expected << EOM
+fruit	yumLevel
+apple	5
+banana	4
+EOM
+
+  X=$(./yq -o=t test.yml)
+  assertEquals "$expected" "$X"
+
+  X=$(./yq ea -o=tsv test.yml)
+  assertEquals "$expected" "$X"
+}
+
 testOutputXml() {
   cat >test.yml <<EOL
 a: {b: {c: ["cat"]}}

acceptance_tests/split-printer.sh

@@ -25,6 +25,56 @@ EOM
   assertEquals "$expectedDoc2" "$doc2"
 }
 
+testBasicSplitWithNameCustomExtension() {
+  rm test*.yaml || true
+  cat >test.yml <<EOL
+a: test_doc1
+--- 
+a: test_doc2
+EOL
+
+  ./yq e test.yml -s '.a + ".yaml"'
+
+  doc1=$(cat test_doc1.yaml)
+  
+  assertEquals "a: test_doc1" "$doc1"
+
+  doc2=$(cat test_doc2.yaml)
+  read -r -d '' expectedDoc2 << EOM
+---
+a: test_doc2
+EOM
+  assertEquals "$expectedDoc2" "$doc2"
+}
+
+
+
+
+testSplitFromFile() {
+  cat >test.yml <<EOL
+a: test_doc1
+--- 
+a: test_doc2
+EOL
+
+cat >test_splitExp.yml <<EOL
+.a
+EOL
+
+  ./yq test.yml --split-exp-file test_splitExp.yml
+
+  doc1=$(cat test_doc1.yml)
+  
+  assertEquals "a: test_doc1" "$doc1"
+
+  doc2=$(cat test_doc2.yml)
+  read -r -d '' expectedDoc2 << EOM
+---
+a: test_doc2
+EOM
+  assertEquals "$expectedDoc2" "$doc2"
+}
+
 testBasicSplitWithNameEvalAll() {
   cat >test.yml <<EOL
 a: test_doc1

cmd/constant.go

@@ -10,6 +10,9 @@ var inputFormat = "yaml"
 
 var xmlAttributePrefix = "+"
 var xmlContentName = "+content"
+var xmlStrictMode = false
+var xmlKeepNamespace = true
+var xmlUseRawToken = true
 
 var exitStatus = false
 var forceColor = false
@@ -26,6 +29,7 @@ var prettyPrint = false
 var frontMatter = ""
 
 var splitFileExp = ""
+var splitFileExpFile = ""
 
 var completedSuccessfully = false
 

cmd/evaluate_all_command.go

@@ -2,7 +2,6 @@ package cmd
 
 import (
 	"errors"
-	"os"
 
 	"github.com/mikefarah/yq/v4/pkg/yqlib"
 	"github.com/spf13/cobra"
@@ -47,36 +46,17 @@ func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {
 
 	var err error
 
-	firstFileIndex, err := initCommand(cmd, args)
+	expression, args, err := initCommand(cmd, args)
 	if err != nil {
 		return err
 	}
 
-	stat, _ := os.Stdin.Stat()
-	pipingStdIn := (stat.Mode() & os.ModeCharDevice) == 0
-	yqlib.GetLogger().Debug("pipingStdIn: %v", pipingStdIn)
-
-	yqlib.GetLogger().Debug("stat.Mode(): %v", stat.Mode())
-	yqlib.GetLogger().Debug("ModeDir: %v", stat.Mode()&os.ModeDir)
-	yqlib.GetLogger().Debug("ModeAppend: %v", stat.Mode()&os.ModeAppend)
-	yqlib.GetLogger().Debug("ModeExclusive: %v", stat.Mode()&os.ModeExclusive)
-	yqlib.GetLogger().Debug("ModeTemporary: %v", stat.Mode()&os.ModeTemporary)
-	yqlib.GetLogger().Debug("ModeSymlink: %v", stat.Mode()&os.ModeSymlink)
-	yqlib.GetLogger().Debug("ModeDevice: %v", stat.Mode()&os.ModeDevice)
-	yqlib.GetLogger().Debug("ModeNamedPipe: %v", stat.Mode()&os.ModeNamedPipe)
-	yqlib.GetLogger().Debug("ModeSocket: %v", stat.Mode()&os.ModeSocket)
-	yqlib.GetLogger().Debug("ModeSetuid: %v", stat.Mode()&os.ModeSetuid)
-	yqlib.GetLogger().Debug("ModeSetgid: %v", stat.Mode()&os.ModeSetgid)
-	yqlib.GetLogger().Debug("ModeCharDevice: %v", stat.Mode()&os.ModeCharDevice)
-	yqlib.GetLogger().Debug("ModeSticky: %v", stat.Mode()&os.ModeSticky)
-	yqlib.GetLogger().Debug("ModeIrregular: %v", stat.Mode()&os.ModeIrregular)
-
 	out := cmd.OutOrStdout()
 
 	if writeInplace {
 		// only use colors if its forced
 		colorsEnabled = forceColor
-		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[firstFileIndex])
+		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[0])
 		out, err = writeInPlaceHandler.CreateTempFile()
 		if err != nil {
 			return err
@@ -109,12 +89,12 @@ func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {
 	printer := yqlib.NewPrinter(encoder, printerWriter)
 
 	if frontMatter != "" {
-		frontMatterHandler := yqlib.NewFrontMatterHandler(args[firstFileIndex])
+		frontMatterHandler := yqlib.NewFrontMatterHandler(args[0])
 		err = frontMatterHandler.Split()
 		if err != nil {
 			return err
 		}
-		args[firstFileIndex] = frontMatterHandler.GetYamlFrontMatterFilename()
+		args[0] = frontMatterHandler.GetYamlFrontMatterFilename()
 
 		if frontMatter == "process" {
 			reader := frontMatterHandler.GetContentReader()
@@ -126,12 +106,6 @@ func evaluateAll(cmd *cobra.Command, args []string) (cmdError error) {
 
 	allAtOnceEvaluator := yqlib.NewAllAtOnceEvaluator()
 
-	expression, args, err := processArgs(pipingStdIn, args)
-	if err != nil {
-		return err
-	}
-	yqlib.GetLogger().Debugf("processed args: %v", args)
-
 	switch len(args) {
 	case 0:
 		if nullInput {

cmd/evalute_sequence_command.go

@@ -3,7 +3,6 @@ package cmd
 import (
 	"errors"
 	"fmt"
-	"os"
 
 	"github.com/mikefarah/yq/v4/pkg/yqlib"
 	"github.com/spf13/cobra"
@@ -59,42 +58,19 @@ func evaluateSequence(cmd *cobra.Command, args []string) (cmdError error) {
 	// 1 arg, read file in sequence
 	// 2+ args, [0] = expression, file the rest
 
+	out := cmd.OutOrStdout()
+
 	var err error
-	firstFileIndex, err := initCommand(cmd, args)
+
+	expression, args, err := initCommand(cmd, args)
 	if err != nil {
 		return err
 	}
 
-	stat, _ := os.Stdin.Stat()
-	pipingStdIn := (stat.Mode() & os.ModeCharDevice) == 0
-	yqlib.GetLogger().Debug("pipingStdIn: %v", pipingStdIn)
-
-	yqlib.GetLogger().Debug("stat.Mode(): %v", stat.Mode())
-	yqlib.GetLogger().Debug("ModeDir: %v", stat.Mode()&os.ModeDir)
-	yqlib.GetLogger().Debug("ModeAppend: %v", stat.Mode()&os.ModeAppend)
-	yqlib.GetLogger().Debug("ModeExclusive: %v", stat.Mode()&os.ModeExclusive)
-	yqlib.GetLogger().Debug("ModeTemporary: %v", stat.Mode()&os.ModeTemporary)
-	yqlib.GetLogger().Debug("ModeSymlink: %v", stat.Mode()&os.ModeSymlink)
-	yqlib.GetLogger().Debug("ModeDevice: %v", stat.Mode()&os.ModeDevice)
-	yqlib.GetLogger().Debug("ModeNamedPipe: %v", stat.Mode()&os.ModeNamedPipe)
-	yqlib.GetLogger().Debug("ModeSocket: %v", stat.Mode()&os.ModeSocket)
-	yqlib.GetLogger().Debug("ModeSetuid: %v", stat.Mode()&os.ModeSetuid)
-	yqlib.GetLogger().Debug("ModeSetgid: %v", stat.Mode()&os.ModeSetgid)
-	yqlib.GetLogger().Debug("ModeCharDevice: %v", stat.Mode()&os.ModeCharDevice)
-	yqlib.GetLogger().Debug("ModeSticky: %v", stat.Mode()&os.ModeSticky)
-	yqlib.GetLogger().Debug("ModeIrregular: %v", stat.Mode()&os.ModeIrregular)
-
-	// Mask for the type bits. For regular files, none will be set.
-	yqlib.GetLogger().Debug("ModeType: %v", stat.Mode()&os.ModeType)
-
-	yqlib.GetLogger().Debug("ModePerm: %v", stat.Mode()&os.ModePerm)
-
-	out := cmd.OutOrStdout()
-
 	if writeInplace {
 		// only use colors if its forced
 		colorsEnabled = forceColor
-		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[firstFileIndex])
+		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[0])
 		out, err = writeInPlaceHandler.CreateTempFile()
 		if err != nil {
 			return err
@@ -129,12 +105,12 @@ func evaluateSequence(cmd *cobra.Command, args []string) (cmdError error) {
 
 	if frontMatter != "" {
 		yqlib.GetLogger().Debug("using front matter handler")
-		frontMatterHandler := yqlib.NewFrontMatterHandler(args[firstFileIndex])
+		frontMatterHandler := yqlib.NewFrontMatterHandler(args[0])
 		err = frontMatterHandler.Split()
 		if err != nil {
 			return err
 		}
-		args[firstFileIndex] = frontMatterHandler.GetYamlFrontMatterFilename()
+		args[0] = frontMatterHandler.GetYamlFrontMatterFilename()
 
 		if frontMatter == "process" {
 			reader := frontMatterHandler.GetContentReader()
@@ -143,10 +119,6 @@ func evaluateSequence(cmd *cobra.Command, args []string) (cmdError error) {
 		}
 		defer frontMatterHandler.CleanUp()
 	}
-	expression, args, err := processArgs(pipingStdIn, args)
-	if err != nil {
-		return err
-	}
 
 	switch len(args) {
 	case 0:

cmd/root.go

@@ -18,10 +18,13 @@ See https://mikefarah.gitbook.io/yq/ for detailed documentation and examples.`,
 # yq defaults to 'eval' command if no command is specified. See "yq eval --help" for more examples.
 
 # read the "stuff" node from "myfile.yml"
-cat myfile.yml | yq '.stuff' 
+yq '.stuff' < myfile.yml
 
 # update myfile.yml in place
-yq -i '.stuff = "foo"' myfile.yml # update myfile.yml inplace
+yq -i '.stuff = "foo"' myfile.yml
+
+# print contents of sample.json as idiomatic YAML
+yq -P sample.json
 `,
 
 		RunE: func(cmd *cobra.Command, args []string) error {
@@ -51,6 +54,7 @@ yq -i '.stuff = "foo"' myfile.yml # update myfile.yml inplace
 			yqlib.InitExpressionParser()
 			yqlib.XMLPreferences.AttributePrefix = xmlAttributePrefix
 			yqlib.XMLPreferences.ContentName = xmlContentName
+			yqlib.XMLPreferences.StrictMode = xmlStrictMode
 		},
 	}
 
@@ -67,6 +71,9 @@ yq -i '.stuff = "foo"' myfile.yml # update myfile.yml inplace
 
 	rootCmd.PersistentFlags().StringVar(&xmlAttributePrefix, "xml-attribute-prefix", "+", "prefix for xml attributes")
 	rootCmd.PersistentFlags().StringVar(&xmlContentName, "xml-content-name", "+content", "name for xml content (if no attribute name is present).")
+	rootCmd.PersistentFlags().BoolVar(&xmlStrictMode, "xml-strict-mode", false, "enables strict parsing of XML. See https://pkg.go.dev/encoding/xml for more details.")
+	rootCmd.PersistentFlags().BoolVar(&xmlKeepNamespace, "xml-keep-namespace", true, "enables keeping namespace after parsing attributes")
+	rootCmd.PersistentFlags().BoolVar(&xmlUseRawToken, "xml-raw-token", true, "enables using RawToken method instead Token. Commonly disables namespace translations. See https://pkg.go.dev/encoding/xml#Decoder.RawToken for details.")
 
 	rootCmd.PersistentFlags().BoolVarP(&nullInput, "null-input", "n", false, "Don't read input, simply evaluate the expression given. Useful for creating docs from scratch.")
 	rootCmd.PersistentFlags().BoolVarP(&noDocSeparators, "no-doc", "N", false, "Don't print document separators (---)")
@@ -74,7 +81,7 @@ yq -i '.stuff = "foo"' myfile.yml # update myfile.yml inplace
 	rootCmd.PersistentFlags().IntVarP(&indent, "indent", "I", 2, "sets indent level for output")
 	rootCmd.Flags().BoolVarP(&version, "version", "V", false, "Print version information and quit")
 	rootCmd.PersistentFlags().BoolVarP(&writeInplace, "inplace", "i", false, "update the file inplace of first file given.")
-	rootCmd.PersistentFlags().BoolVarP(&unwrapScalar, "unwrapScalar", "", true, "unwrap scalar, print the value with no quotes, colors or comments")
+	rootCmd.PersistentFlags().BoolVarP(&unwrapScalar, "unwrapScalar", "r", true, "unwrap scalar, print the value with no quotes, colors or comments")
 	rootCmd.PersistentFlags().BoolVarP(&prettyPrint, "prettyPrint", "P", false, "pretty print, shorthand for '... style = \"\"'")
 	rootCmd.PersistentFlags().BoolVarP(&exitStatus, "exit-status", "e", false, "set exit status if there are no matches or null or false is returned")
 
@@ -85,6 +92,7 @@ yq -i '.stuff = "foo"' myfile.yml # update myfile.yml inplace
 	rootCmd.PersistentFlags().BoolVarP(&leadingContentPreProcessing, "header-preprocess", "", true, "Slurp any header comments and separators before processing expression.")
 
 	rootCmd.PersistentFlags().StringVarP(&splitFileExp, "split-exp", "s", "", "print each result (or doc) into a file named (exp). [exp] argument must return a string. You can use $index in the expression as the result counter.")
+	rootCmd.PersistentFlags().StringVarP(&splitFileExpFile, "split-exp-file", "", "", "Use a file to specify the split-exp expression.")
 
 	rootCmd.PersistentFlags().StringVarP(&expressionFile, "from-file", "", "", "Load expression from specified file.")
 

cmd/utils.go

@@ -10,7 +10,7 @@ import (
 	"gopkg.in/op/go-logging.v1"
 )
 
-func initCommand(cmd *cobra.Command, args []string) (firstFileIndex int, err error) {
+func initCommand(cmd *cobra.Command, args []string) (string, []string, error) {
 	cmd.SilenceUsage = true
 
 	fileInfo, _ := os.Stdout.Stat()
@@ -19,11 +19,17 @@ func initCommand(cmd *cobra.Command, args []string) (firstFileIndex int, err err
 		colorsEnabled = true
 	}
 
-	firstFileIndex = -1
-	if !nullInput && len(args) == 1 {
-		firstFileIndex = 0
-	} else if len(args) > 1 {
-		firstFileIndex = 1
+	expression, args, err := processArgs(args)
+	if err != nil {
+		return "", nil, err
+	}
+
+	if splitFileExpFile != "" {
+		splitExpressionBytes, err := os.ReadFile(splitFileExpFile)
+		if err != nil {
+			return "", nil, err
+		}
+		splitFileExp = string(splitExpressionBytes)
 	}
 
 	// backwards compatibility
@@ -31,19 +37,23 @@ func initCommand(cmd *cobra.Command, args []string) (firstFileIndex int, err err
 		outputFormat = "json"
 	}
 
-	if writeInplace && (firstFileIndex == -1) {
-		return 0, fmt.Errorf("write inplace flag only applicable when giving an expression and at least one file")
+	if writeInplace && (len(args) == 0 || args[0] == "-") {
+		return "", nil, fmt.Errorf("write inplace flag only applicable when giving an expression and at least one file")
+	}
+
+	if frontMatter != "" && len(args) == 0 {
+		return "", nil, fmt.Errorf("front matter flag only applicable when giving an expression and at least one file")
 	}
 
 	if writeInplace && splitFileExp != "" {
-		return 0, fmt.Errorf("write inplace cannot be used with split file")
+		return "", nil, fmt.Errorf("write inplace cannot be used with split file")
 	}
 
-	if nullInput && len(args) > 1 {
-		return 0, fmt.Errorf("cannot pass files in when using null-input flag")
+	if nullInput && len(args) > 0 {
+		return "", nil, fmt.Errorf("cannot pass files in when using null-input flag")
 	}
 
-	return firstFileIndex, nil
+	return expression, args, nil
 }
 
 func configureDecoder() (yqlib.Decoder, error) {
@@ -53,9 +63,15 @@ func configureDecoder() (yqlib.Decoder, error) {
 	}
 	switch yqlibInputFormat {
 	case yqlib.XMLInputFormat:
-		return yqlib.NewXMLDecoder(xmlAttributePrefix, xmlContentName), nil
+		return yqlib.NewXMLDecoder(xmlAttributePrefix, xmlContentName, xmlStrictMode, xmlKeepNamespace, xmlUseRawToken), nil
 	case yqlib.PropertiesInputFormat:
 		return yqlib.NewPropertiesDecoder(), nil
+	case yqlib.JsonInputFormat:
+		return yqlib.NewJSONDecoder(), nil
+	case yqlib.CSVObjectInputFormat:
+		return yqlib.NewCSVObjectDecoder(','), nil
+	case yqlib.TSVObjectInputFormat:
+		return yqlib.NewCSVObjectDecoder('\t'), nil
 	}
 
 	return yqlib.NewYamlDecoder(), nil
@@ -81,9 +97,9 @@ func configurePrinterWriter(format yqlib.PrinterOutputFormat, out io.Writer) (yq
 func configureEncoder(format yqlib.PrinterOutputFormat) yqlib.Encoder {
 	switch format {
 	case yqlib.JSONOutputFormat:
-		return yqlib.NewJONEncoder(indent)
+		return yqlib.NewJSONEncoder(indent, colorsEnabled)
 	case yqlib.PropsOutputFormat:
-		return yqlib.NewPropertiesEncoder()
+		return yqlib.NewPropertiesEncoder(unwrapScalar)
 	case yqlib.CSVOutputFormat:
 		return yqlib.NewCsvEncoder(',')
 	case yqlib.TSVOutputFormat:
@@ -116,12 +132,15 @@ func maybeFile(str string) bool {
 	return result
 }
 
-func processStdInArgs(pipingStdin bool, args []string) []string {
+func processStdInArgs(args []string) []string {
+	stat, _ := os.Stdin.Stat()
+	pipingStdin := (stat.Mode() & os.ModeCharDevice) == 0
+
 	// if we've been given a file, don't automatically
 	// read from stdin.
 	// this happens if there is more than one argument
 	// or only one argument and its a file
-	if !pipingStdin || len(args) > 1 || (len(args) > 0 && maybeFile(args[0])) {
+	if nullInput || !pipingStdin || len(args) > 1 || (len(args) > 0 && maybeFile(args[0])) {
 		return args
 	}
 
@@ -137,7 +156,7 @@ func processStdInArgs(pipingStdin bool, args []string) []string {
 	return append(args, "-")
 }
 
-func processArgs(pipingStdin bool, originalArgs []string) (string, []string, error) {
+func processArgs(originalArgs []string) (string, []string, error) {
 	expression := forceExpression
 	if expressionFile != "" {
 		expressionBytes, err := os.ReadFile(expressionFile)
@@ -147,7 +166,7 @@ func processArgs(pipingStdin bool, originalArgs []string) (string, []string, err
 		expression = string(expressionBytes)
 	}
 
-	args := processStdInArgs(pipingStdin, originalArgs)
+	args := processStdInArgs(originalArgs)
 	yqlib.GetLogger().Debugf("processed args: %v", args)
 	if expression == "" && len(args) > 0 && args[0] != "-" && !maybeFile(args[0]) {
 		yqlib.GetLogger().Debug("assuming expression is '%v'", args[0])

cmd/version.go

@@ -11,7 +11,7 @@ var (
 	GitDescribe string
 
 	// Version is main version number that is being run at the moment.
-	Version = "4.22.1"
+	Version = "4.26.1"
 
 	// VersionPrerelease is a pre-release marker for the version. If this is "" (empty string)
 	// then it means that it is a final release. Otherwise, this is a pre-release

examples/data1.yaml

@@ -1 +1,12 @@
-cat: purrs
+# --------------------------------------------------
+# It's a test with comment
+# --------------------------------------------------
+test:
+  - name: a
+  - name: b
+  - name: c
+groups:
+  - name: a
+  - name: b
+  - name: c
+  - name: c

examples/data2.yaml

@@ -1,2 +1,5 @@
-c:
-  d: hamster
+# --------------------------------------------------
+# It's a test with comment
+# --------------------------------------------------
+groups:
+  - name: d

examples/sample_objects.csv

@@ -0,0 +1,3 @@
+name,numberOfCats,likesApples,height
+Gary,1,true,168.8
+Samantha's Rabbit,2,false,-188.8

go.mod

@@ -2,17 +2,19 @@ module github.com/mikefarah/yq/v4
 
 require (
 	github.com/a8m/envsubst v1.3.0
+	github.com/alecthomas/participle/v2 v2.0.0-beta.4
+	github.com/alecthomas/repr v0.1.0
 	github.com/elliotchance/orderedmap v1.4.0
 	github.com/fatih/color v1.13.0
+	github.com/goccy/go-json v0.9.10
 	github.com/goccy/go-yaml v1.9.5
 	github.com/jinzhu/copier v0.3.5
 	github.com/magiconair/properties v1.8.6
 	github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e
-	github.com/spf13/cobra v1.3.0
-	github.com/timtadh/lexmachine v0.2.2
-	golang.org/x/net v0.0.0-20210813160813-60bc85c4be6d
+	github.com/spf13/cobra v1.5.0
+	golang.org/x/net v0.0.0-20220708220712-1185a9018129
 	gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473
-	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
+	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
@@ -20,10 +22,9 @@ require (
 	github.com/mattn/go-colorable v0.1.12 // indirect
 	github.com/mattn/go-isatty v0.0.14 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
-	github.com/timtadh/data-structures v0.5.3 // indirect
-	golang.org/x/sys v0.0.0-20211205182925-97ca703d548d // indirect
+	golang.org/x/sys v0.0.0-20220712014510-0a85c31ab51e // indirect
 	golang.org/x/text v0.3.7 // indirect
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	golang.org/x/xerrors v0.0.0-20220609144429-65e65417b02f // indirect
 )
 
-go 1.17
+go 1.18

go.sum

@@ -1,797 +1,81 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
-cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
-cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
-cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
-cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
-cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
-cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
-cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
-cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
-cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
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-google.golang.org/grpc v1.27.1/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
-google.golang.org/grpc v1.28.0/go.mod h1:rpkK4SK4GF4Ach/+MFLZUBavHOvF2JJB5uozKKal+60=
-google.golang.org/grpc v1.29.1/go.mod h1:itym6AZVZYACWQqET3MqgPpjcuV5QH3BxFS3IjizoKk=
-google.golang.org/grpc v1.30.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
-google.golang.org/grpc v1.31.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
-google.golang.org/grpc v1.31.1/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
-google.golang.org/grpc v1.33.1/go.mod h1:fr5YgcSWrqhRRxogOsw7RzIpsmvOZ6IcH4kBYTpR3n0=
-google.golang.org/grpc v1.33.2/go.mod h1:JMHMWHQWaTccqQQlmk3MJZS+GWXOdAesneDmEnv2fbc=
-google.golang.org/grpc v1.34.0/go.mod h1:WotjhfgOW/POjDeRt8vscBtXq+2VjORFy659qA51WJ8=
-google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
-google.golang.org/grpc v1.36.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
-google.golang.org/grpc v1.36.1/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
-google.golang.org/grpc v1.37.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
-google.golang.org/grpc v1.37.1/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
-google.golang.org/grpc v1.38.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
-google.golang.org/grpc v1.39.0/go.mod h1:PImNr+rS9TWYb2O4/emRugxiyHZ5JyHW5F+RPnDzfrE=
-google.golang.org/grpc v1.39.1/go.mod h1:PImNr+rS9TWYb2O4/emRugxiyHZ5JyHW5F+RPnDzfrE=
-google.golang.org/grpc v1.40.0/go.mod h1:ogyxbiOoUXAkP+4+xa6PZSE9DZgIHtSpzjDTB9KAK34=
-google.golang.org/grpc v1.40.1/go.mod h1:ogyxbiOoUXAkP+4+xa6PZSE9DZgIHtSpzjDTB9KAK34=
-google.golang.org/grpc v1.42.0/go.mod h1:k+4IHHFw41K8+bbowsex27ge2rCb65oeWqe4jJ590SU=
-google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0/go.mod h1:6Kw0yEErY5E/yWrBtf03jp27GLLJujG4z/JK95pnjjw=
-google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
-google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
-google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
-google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
-google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
-google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
-google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
+golang.org/x/xerrors v0.0.0-20220609144429-65e65417b02f h1:uF6paiQQebLeSXkrTqHqz0MXhXXS1KgF41eUdBNvxK0=
+golang.org/x/xerrors v0.0.0-20220609144429-65e65417b02f/go.mod h1:K8+ghG5WaK9qNqU5K3HdILfMLy1f3aNYFI/wnl100a8=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/ini.v1 v1.66.2/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473 h1:6D+BvnJ/j6e222UW8s2qTSe3wGBtvo0MbVQG/c5k8RE=
 gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473/go.mod h1:N1eN2tsCx0Ydtgjl4cqmbRCsY4/+z4cYDeqwZTk6zog=
-gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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-gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
-honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
-honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
-rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
-rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
-rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

how-it-works.md

@@ -19,7 +19,7 @@ with an expression:
 .a = .b
 ```
 
-Like math expression - operator precedence is important. 
+Like math expressions - operator precedence is important. 
 
 The `=` operator takes two arguments, a `lhs` expression, which in this case is `.a` and `rhs` expression which is `.b`. 
 
@@ -47,7 +47,7 @@ b: dog
 
 ## Complex assignment, operator precedence rules
 
-Just like math expression - `yq` expression have an order of precedence. The pipe `|` operator has a low order of precedence, so operators with higher precedence will get evalated first. 
+Just like math expressions - `yq` expressions have an order of precedence. The pipe `|` operator has a low order of precedence, so operators with higher precedence will get evaluated first. 
 
 Most of the time, this is intuitively what you'd want, for instance `.a = "cat" | .b = "dog"` is effectively: `(.a = "cat") | (.b = "dog")`.
 
@@ -66,7 +66,7 @@ Lets say you had:
 Lets say you wanted to update the `sally` entry to have fruit: 'mango'. The _incorrect_ way to do that is:
 `.[] | select(.name == "sally") | .fruit = "mango"`.
 
-Becasue `|` has a low operator precedence, this will be evaluated (_incorrectly_) as : `(.[]) | (select(.name == "sally")) | (.fruit = "mango")`. What you'll see is only the updated segment returned:
+Because `|` has a low operator precedence, this will be evaluated (_incorrectly_) as : `(.[]) | (select(.name == "sally")) | (.fruit = "mango")`. What you'll see is only the updated segment returned:
 
 ```yaml
 name: sally

pkg/yqlib/all_at_once_evaluator.go

@@ -22,6 +22,7 @@ type allAtOnceEvaluator struct {
 }
 
 func NewAllAtOnceEvaluator() Evaluator {
+	InitExpressionParser()
 	return &allAtOnceEvaluator{treeNavigator: NewDataTreeNavigator()}
 }
 

pkg/yqlib/all_at_once_evaluator_test.go

@@ -31,7 +31,6 @@ var evaluateNodesScenario = []expressionScenario{
 }
 
 func TestAllAtOnceEvaluateNodes(t *testing.T) {
-	InitExpressionParser()
 	var evaluator = NewAllAtOnceEvaluator()
 	for _, tt := range evaluateNodesScenario {
 		node := test.ParseData(tt.document)

pkg/yqlib/candidate_node.go

@@ -14,14 +14,15 @@ type CandidateNode struct {
 	Parent *CandidateNode // parent node
 	Key    *yaml.Node     // node key, if this is a value from a map (or index in an array)
 
-	LeadingContent string
+	LeadingContent  string
+	TrailingContent string
 
 	Path      []interface{} /// the path we took to get to this node
 	Document  uint          // the document index of this node
 	Filename  string
 	FileIndex int
 	// when performing op against all nodes given, this will treat all the nodes as one
-	// (e.g. top level cross document merge). This property does not propegate to child nodes.
+	// (e.g. top level cross document merge). This property does not propagate to child nodes.
 	EvaluateTogether bool
 	IsMapKey         bool
 }
@@ -96,6 +97,13 @@ func (n *CandidateNode) CreateReplacement(node *yaml.Node) *CandidateNode {
 	}
 }
 
+func (n *CandidateNode) CreateReplacementWithDocWrappers(node *yaml.Node) *CandidateNode {
+	replacement := n.CreateReplacement(node)
+	replacement.LeadingContent = n.LeadingContent
+	replacement.TrailingContent = n.TrailingContent
+	return replacement
+}
+
 func (n *CandidateNode) createChildPath(path interface{}) []interface{} {
 	if path == nil {
 		newPath := make([]interface{}, len(n.Path))
@@ -169,6 +177,9 @@ func (n *CandidateNode) UpdateAttributesFrom(other *CandidateNode, prefs assignP
 	if other.Node.FootComment != "" {
 		n.Node.FootComment = other.Node.FootComment
 	}
+	if other.TrailingContent != "" {
+		n.TrailingContent = other.TrailingContent
+	}
 	if other.Node.HeadComment != "" {
 		n.Node.HeadComment = other.Node.HeadComment
 	}

pkg/yqlib/compare_operators.go

@@ -0,0 +1,133 @@
+package yqlib
+
+import (
+	"fmt"
+	"strconv"
+	"time"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+type compareTypePref struct {
+	OrEqual bool
+	Greater bool
+}
+
+func compareOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
+	log.Debugf("-- compareOperator")
+	prefs := expressionNode.Operation.Preferences.(compareTypePref)
+	return crossFunction(d, context.ReadOnlyClone(), expressionNode, compare(prefs), true)
+}
+
+func compare(prefs compareTypePref) func(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+	return func(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+		log.Debugf("-- compare cross function")
+		if lhs == nil && rhs == nil {
+			owner := &CandidateNode{}
+			return createBooleanCandidate(owner, prefs.OrEqual), nil
+		} else if lhs == nil {
+			log.Debugf("lhs nil, but rhs is not")
+			return createBooleanCandidate(rhs, false), nil
+		} else if rhs == nil {
+			log.Debugf("rhs nil, but rhs is not")
+			return createBooleanCandidate(lhs, false), nil
+		}
+
+		lhs.Node = unwrapDoc(lhs.Node)
+		rhs.Node = unwrapDoc(rhs.Node)
+
+		switch lhs.Node.Kind {
+		case yaml.MappingNode:
+			return nil, fmt.Errorf("maps not yet supported for comparison")
+		case yaml.SequenceNode:
+			return nil, fmt.Errorf("arrays not yet supported for comparison")
+		default:
+			if rhs.Node.Kind != yaml.ScalarNode {
+				return nil, fmt.Errorf("%v (%v) cannot be subtracted from %v", rhs.Node.Tag, rhs.Path, lhs.Node.Tag)
+			}
+			target := lhs.CreateReplacement(&yaml.Node{})
+			boolV, err := compareScalars(context, prefs, lhs.Node, rhs.Node)
+
+			return createBooleanCandidate(target, boolV), err
+		}
+	}
+}
+
+func compareDateTime(layout string, prefs compareTypePref, lhs *yaml.Node, rhs *yaml.Node) (bool, error) {
+	lhsTime, err := time.Parse(layout, lhs.Value)
+	if err != nil {
+		return false, err
+	}
+
+	rhsTime, err := time.Parse(layout, rhs.Value)
+	if err != nil {
+		return false, err
+	}
+
+	if prefs.OrEqual && lhsTime.Equal(rhsTime) {
+		return true, nil
+	}
+	if prefs.Greater {
+		return lhsTime.After(rhsTime), nil
+	}
+	return lhsTime.Before(rhsTime), nil
+
+}
+
+func compareScalars(context Context, prefs compareTypePref, lhs *yaml.Node, rhs *yaml.Node) (bool, error) {
+	lhsTag := guessTagFromCustomType(lhs)
+	rhsTag := guessTagFromCustomType(rhs)
+
+	isDateTime := lhs.Tag == "!!timestamp"
+	// if the lhs is a string, it might be a timestamp in a custom format.
+	if lhsTag == "!!str" && context.GetDateTimeLayout() != time.RFC3339 {
+		_, err := time.Parse(context.GetDateTimeLayout(), lhs.Value)
+		isDateTime = err == nil
+	}
+	if isDateTime {
+		return compareDateTime(context.GetDateTimeLayout(), prefs, lhs, rhs)
+	} else if lhsTag == "!!int" && rhsTag == "!!int" {
+		_, lhsNum, err := parseInt64(lhs.Value)
+		if err != nil {
+			return false, err
+		}
+		_, rhsNum, err := parseInt64(rhs.Value)
+		if err != nil {
+			return false, err
+		}
+
+		if prefs.OrEqual && lhsNum == rhsNum {
+			return true, nil
+		}
+		if prefs.Greater {
+			return lhsNum > rhsNum, nil
+		}
+		return lhsNum < rhsNum, nil
+	} else if (lhsTag == "!!int" || lhsTag == "!!float") && (rhsTag == "!!int" || rhsTag == "!!float") {
+		lhsNum, err := strconv.ParseFloat(lhs.Value, 64)
+		if err != nil {
+			return false, err
+		}
+		rhsNum, err := strconv.ParseFloat(rhs.Value, 64)
+		if err != nil {
+			return false, err
+		}
+		if prefs.OrEqual && lhsNum == rhsNum {
+			return true, nil
+		}
+		if prefs.Greater {
+			return lhsNum > rhsNum, nil
+		}
+		return lhsNum < rhsNum, nil
+	} else if lhsTag == "!!str" && rhsTag == "!!str" {
+		if prefs.OrEqual && lhs.Value == rhs.Value {
+			return true, nil
+		}
+		if prefs.Greater {
+			return lhs.Value > rhs.Value, nil
+		}
+		return lhs.Value < rhs.Value, nil
+	}
+
+	return false, fmt.Errorf("%v not yet supported for comparison", lhs.Tag)
+}

pkg/yqlib/compare_operators_test.go

@@ -0,0 +1,371 @@
+package yqlib
+
+import (
+	"testing"
+)
+
+var compareOperatorScenarios = []expressionScenario{
+	// ints, not equal
+	{
+		description: "Compare numbers (>)",
+		document:    "a: 5\nb: 4",
+		expression:  ".a > .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5\nb: 4",
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:     true,
+		description: "Compare integers (>=)",
+		document:    "a: 5\nb: 4",
+		expression:  ".a >= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5\nb: 4",
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+
+	// ints, equal
+	{
+		skipDoc:     true,
+		description: "Compare equal numbers (>)",
+		document:    "a: 5\nb: 5",
+		expression:  ".a > .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5\nb: 5",
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		description: "Compare equal numbers (>=)",
+		document:    "a: 5\nb: 5",
+		expression:  ".a >= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5\nb: 5",
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+
+	// floats, not equal
+	{
+		skipDoc:    true,
+		document:   "a: 5.2\nb: 4.1",
+		expression: ".a > .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5.2\nb: 4.1",
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5.2\nb: 4.1",
+		expression: ".a >= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5.5\nb: 4.1",
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+
+	// floats, equal
+	{
+		skipDoc:    true,
+		document:   "a: 5.5\nb: 5.5",
+		expression: ".a > .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5.5\nb: 5.5",
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5.1\nb: 5.1",
+		expression: ".a >= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 5.1\nb: 5.1",
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+
+	// strings, not equal
+	{
+		description:    "Compare strings",
+		subdescription: "Compares strings by their bytecode.",
+		document:       "a: zoo\nb: apple",
+		expression:     ".a > .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: zoo\nb: apple",
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: zoo\nb: apple",
+		expression: ".a >= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: zoo\nb: apple",
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+
+	// strings, equal
+	{
+		skipDoc:    true,
+		document:   "a: cat\nb: cat",
+		expression: ".a > .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: cat\nb: cat",
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: cat\nb: cat",
+		expression: ".a >= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: cat\nb: cat",
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+
+	// datetime, not equal
+	{
+		description:    "Compare date times",
+		subdescription: "You can compare date times. Assumes RFC3339 date time format, see [date-time operators](https://mikefarah.gitbook.io/yq/operators/date-time-operators) for more information.",
+		document:       "a: 2021-01-01T03:10:00Z\nb: 2020-01-01T03:10:00Z",
+		expression:     ".a > .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 2021-01-01T03:10:00Z\nb: 2020-01-01T03:10:00Z",
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 2021-01-01T03:10:00Z\nb: 2020-01-01T03:10:00Z",
+		expression: ".a >= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 2021-01-01T03:10:00Z\nb: 2020-01-01T03:10:00Z",
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+
+	// datetime, equal
+	{
+		skipDoc:    true,
+		document:   "a: 2021-01-01T03:10:00Z\nb: 2021-01-01T03:10:00Z",
+		expression: ".a > .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 2021-01-01T03:10:00Z\nb: 2021-01-01T03:10:00Z",
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 2021-01-01T03:10:00Z\nb: 2021-01-01T03:10:00Z",
+		expression: ".a >= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   "a: 2021-01-01T03:10:00Z\nb: 2021-01-01T03:10:00Z",
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::true\n",
+		},
+	},
+	// both null
+	{
+		description: "Both sides are null: > is false",
+		expression:  ".a > .b",
+		expected: []string{
+			"D0, P[], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[], (!!bool)::false\n",
+		},
+	},
+	{
+		description: "Both sides are null: >= is true",
+		expression:  ".a >= .b",
+		expected: []string{
+			"D0, P[], (!!bool)::true\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[], (!!bool)::true\n",
+		},
+	},
+
+	// one null
+	{
+		skipDoc:     true,
+		description: "One side is null: > is false",
+		document:    `a: 5`,
+		expression:  ".a > .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `a: 5`,
+		expression: ".a < .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:     true,
+		description: "One side is null: >= is false",
+		document:    `a: 5`,
+		expression:  ".a >= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `a: 5`,
+		expression: ".a <= .b",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `a: 5`,
+		expression: ".b <= .a",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `a: 5`,
+		expression: ".b < .a",
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+		},
+	},
+}
+
+func TestCompareOperatorScenarios(t *testing.T) {
+	for _, tt := range compareOperatorScenarios {
+		testScenario(t, &tt)
+	}
+	documentOperatorScenarios(t, "compare", compareOperatorScenarios)
+}

pkg/yqlib/csv_test.go

@@ -0,0 +1,273 @@
+package yqlib
+
+import (
+	"bufio"
+	"fmt"
+	"testing"
+
+	"github.com/mikefarah/yq/v4/test"
+)
+
+const csvSimple = `name,numberOfCats,likesApples,height
+Gary,1,true,168.8
+Samantha's Rabbit,2,false,-188.8
+`
+
+const expectedUpdatedSimpleCsv = `name,numberOfCats,likesApples,height
+Gary,3,true,168.8
+Samantha's Rabbit,2,false,-188.8
+`
+
+const csvSimpleShort = `Name,Number of Cats
+Gary,1
+Samantha's Rabbit,2
+`
+
+const tsvSimple = `name	numberOfCats	likesApples	height
+Gary	1	true	168.8
+Samantha's Rabbit	2	false	-188.8
+`
+
+const expectedYamlFromCSV = `- name: Gary
+  numberOfCats: 1
+  likesApples: true
+  height: 168.8
+- name: Samantha's Rabbit
+  numberOfCats: 2
+  likesApples: false
+  height: -188.8
+`
+
+const expectedYamlFromCSVMissingData = `- name: Gary
+  numberOfCats: 1
+  height: 168.8
+- name: Samantha's Rabbit
+  height: -188.8
+  likesApples: false
+`
+
+const csvSimpleMissingData = `name,numberOfCats,height
+Gary,1,168.8
+Samantha's Rabbit,,-188.8
+`
+
+const csvTestSimpleYaml = `- [i, like, csv]
+- [because, excel, is, cool]`
+
+const expectedSimpleCsv = `i,like,csv
+because,excel,is,cool
+`
+
+const tsvTestExpectedSimpleCsv = `i	like	csv
+because	excel	is	cool
+`
+
+var csvScenarios = []formatScenario{
+	{
+		description:  "Encode CSV simple",
+		input:        csvTestSimpleYaml,
+		expected:     expectedSimpleCsv,
+		scenarioType: "encode-csv",
+	},
+	{
+		description:  "Encode TSV simple",
+		input:        csvTestSimpleYaml,
+		expected:     tsvTestExpectedSimpleCsv,
+		scenarioType: "encode-tsv",
+	},
+	{
+		description:  "Encode Empty",
+		skipDoc:      true,
+		input:        `[]`,
+		expected:     "",
+		scenarioType: "encode-csv",
+	},
+	{
+		description:  "Comma in value",
+		skipDoc:      true,
+		input:        `["comma, in, value", things]`,
+		expected:     "\"comma, in, value\",things\n",
+		scenarioType: "encode-csv",
+	},
+	{
+		description:  "Encode array of objects to csv",
+		input:        expectedYamlFromCSV,
+		expected:     csvSimple,
+		scenarioType: "encode-csv",
+	},
+	{
+		description:    "Encode array of objects to custom csv format",
+		subdescription: "Add the header row manually, then the we convert each object into an array of values - resulting in an array of arrays. Pick the columns and call the header whatever you like.",
+		input:          expectedYamlFromCSV,
+		expected:       csvSimpleShort,
+		expression:     `[["Name", "Number of Cats"]] +  [.[] | [.name, .numberOfCats ]]`,
+		scenarioType:   "encode-csv",
+	},
+	{
+		description:    "Encode array of objects to csv - missing fields behaviour",
+		subdescription: "First entry is used to determine the headers, and it is missing 'likesApples', so it is not included in the csv. Second entry does not have 'numberOfCats' so that is blank",
+		input:          expectedYamlFromCSVMissingData,
+		expected:       csvSimpleMissingData,
+		scenarioType:   "encode-csv",
+	},
+	{
+		description:    "Parse CSV into an array of objects",
+		subdescription: "First row is assumed to be the header row.",
+		input:          csvSimple,
+		expected:       expectedYamlFromCSV,
+		scenarioType:   "decode-csv-object",
+	},
+	{
+		description:    "Parse TSV into an array of objects",
+		subdescription: "First row is assumed to be the header row.",
+		input:          tsvSimple,
+		expected:       expectedYamlFromCSV,
+		scenarioType:   "decode-tsv-object",
+	},
+	{
+		description:  "Round trip",
+		input:        csvSimple,
+		expected:     expectedUpdatedSimpleCsv,
+		expression:   `(.[] | select(.name == "Gary") | .numberOfCats) = 3`,
+		scenarioType: "roundtrip-csv",
+	},
+}
+
+func testCSVScenario(t *testing.T, s formatScenario) {
+	switch s.scenarioType {
+	case "encode-csv":
+		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewYamlDecoder(), NewCsvEncoder(',')), s.description)
+	case "encode-tsv":
+		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewYamlDecoder(), NewCsvEncoder('\t')), s.description)
+	case "decode-csv-object":
+		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewCSVObjectDecoder(','), NewYamlEncoder(2, false, true, true)), s.description)
+	case "decode-tsv-object":
+		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewCSVObjectDecoder('\t'), NewYamlEncoder(2, false, true, true)), s.description)
+	case "roundtrip-csv":
+		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewCSVObjectDecoder(','), NewCsvEncoder(',')), s.description)
+	default:
+		panic(fmt.Sprintf("unhandled scenario type %q", s.scenarioType))
+	}
+}
+
+func documentCSVDecodeObjectScenario(t *testing.T, w *bufio.Writer, s formatScenario, formatType string) {
+	writeOrPanic(w, fmt.Sprintf("## %v\n", s.description))
+
+	if s.subdescription != "" {
+		writeOrPanic(w, s.subdescription)
+		writeOrPanic(w, "\n\n")
+	}
+
+	writeOrPanic(w, fmt.Sprintf("Given a sample.%v file of:\n", formatType))
+	writeOrPanic(w, fmt.Sprintf("```%v\n%v\n```\n", formatType, s.input))
+
+	writeOrPanic(w, "then\n")
+	writeOrPanic(w, fmt.Sprintf("```bash\nyq -p=%v sample.%v\n```\n", formatType, formatType))
+	writeOrPanic(w, "will output\n")
+
+	separator := ','
+	if formatType == "tsv" {
+		separator = '\t'
+	}
+
+	writeOrPanic(w, fmt.Sprintf("```yaml\n%v```\n\n",
+		processFormatScenario(s, NewCSVObjectDecoder(separator), NewYamlEncoder(s.indent, false, true, true))),
+	)
+}
+
+func documentCSVEncodeScenario(w *bufio.Writer, s formatScenario, formatType string) {
+	writeOrPanic(w, fmt.Sprintf("## %v\n", s.description))
+
+	if s.subdescription != "" {
+		writeOrPanic(w, s.subdescription)
+		writeOrPanic(w, "\n\n")
+	}
+
+	writeOrPanic(w, "Given a sample.yml file of:\n")
+	writeOrPanic(w, fmt.Sprintf("```yaml\n%v\n```\n", s.input))
+
+	writeOrPanic(w, "then\n")
+
+	expression := s.expression
+
+	if expression != "" {
+		writeOrPanic(w, fmt.Sprintf("```bash\nyq -o=%v '%v' sample.yml\n```\n", formatType, expression))
+	} else {
+		writeOrPanic(w, fmt.Sprintf("```bash\nyq -o=%v sample.yml\n```\n", formatType))
+	}
+	writeOrPanic(w, "will output\n")
+
+	separator := ','
+	if formatType == "tsv" {
+		separator = '\t'
+	}
+
+	writeOrPanic(w, fmt.Sprintf("```%v\n%v```\n\n", formatType,
+		processFormatScenario(s, NewYamlDecoder(), NewCsvEncoder(separator))),
+	)
+}
+
+func documentCSVRoundTripScenario(w *bufio.Writer, s formatScenario, formatType string) {
+	writeOrPanic(w, fmt.Sprintf("## %v\n", s.description))
+
+	if s.subdescription != "" {
+		writeOrPanic(w, s.subdescription)
+		writeOrPanic(w, "\n\n")
+	}
+
+	writeOrPanic(w, fmt.Sprintf("Given a sample.%v file of:\n", formatType))
+	writeOrPanic(w, fmt.Sprintf("```%v\n%v\n```\n", formatType, s.input))
+
+	writeOrPanic(w, "then\n")
+
+	expression := s.expression
+
+	if expression != "" {
+		writeOrPanic(w, fmt.Sprintf("```bash\nyq -p=%v -o=%v '%v' sample.%v\n```\n", formatType, formatType, expression, formatType))
+	} else {
+		writeOrPanic(w, fmt.Sprintf("```bash\nyq -p=%v -o=%v sample.%v\n```\n", formatType, formatType, formatType))
+	}
+	writeOrPanic(w, "will output\n")
+
+	separator := ','
+	if formatType == "tsv" {
+		separator = '\t'
+	}
+
+	writeOrPanic(w, fmt.Sprintf("```%v\n%v```\n\n", formatType,
+		processFormatScenario(s, NewCSVObjectDecoder(separator), NewCsvEncoder(separator))),
+	)
+}
+
+func documentCSVScenario(t *testing.T, w *bufio.Writer, i interface{}) {
+	s := i.(formatScenario)
+	if s.skipDoc {
+		return
+	}
+	switch s.scenarioType {
+	case "encode-csv":
+		documentCSVEncodeScenario(w, s, "csv")
+	case "encode-tsv":
+		documentCSVEncodeScenario(w, s, "tsv")
+	case "decode-csv-object":
+		documentCSVDecodeObjectScenario(t, w, s, "csv")
+	case "decode-tsv-object":
+		documentCSVDecodeObjectScenario(t, w, s, "tsv")
+	case "roundtrip-csv":
+		documentCSVRoundTripScenario(w, s, "csv")
+
+	default:
+		panic(fmt.Sprintf("unhandled scenario type %q", s.scenarioType))
+	}
+}
+
+func TestCSVScenarios(t *testing.T) {
+	for _, tt := range csvScenarios {
+		testCSVScenario(t, tt)
+	}
+	genericScenarios := make([]interface{}, len(csvScenarios))
+	for i, s := range csvScenarios {
+		genericScenarios[i] = s
+	}
+	documentScenarios(t, "usage", "csv-tsv", genericScenarios, documentCSVScenario)
+}

pkg/yqlib/decoder.go

@@ -14,6 +14,9 @@ const (
 	XMLInputFormat
 	PropertiesInputFormat
 	Base64InputFormat
+	JsonInputFormat
+	CSVObjectInputFormat
+	TSVObjectInputFormat
 )
 
 type Decoder interface {
@@ -29,6 +32,12 @@ func InputFormatFromString(format string) (InputFormat, error) {
 		return XMLInputFormat, nil
 	case "props", "p":
 		return PropertiesInputFormat, nil
+	case "json", "ndjson", "j":
+		return JsonInputFormat, nil
+	case "csv", "c":
+		return CSVObjectInputFormat, nil
+	case "tsv", "t":
+		return TSVObjectInputFormat, nil
 	default:
 		return 0, fmt.Errorf("unknown format '%v' please use [yaml|xml|props]", format)
 	}

pkg/yqlib/decoder_base64.go

@@ -9,9 +9,10 @@ import (
 )
 
 type base64Decoder struct {
-	reader   io.Reader
-	finished bool
-	encoding base64.Encoding
+	reader       io.Reader
+	finished     bool
+	readAnything bool
+	encoding     base64.Encoding
 }
 
 func NewBase64Decoder() Decoder {
@@ -20,6 +21,7 @@ func NewBase64Decoder() Decoder {
 
 func (dec *base64Decoder) Init(reader io.Reader) {
 	dec.reader = reader
+	dec.readAnything = false
 	dec.finished = false
 }
 
@@ -35,8 +37,15 @@ func (dec *base64Decoder) Decode(rootYamlNode *yaml.Node) error {
 	}
 	if buf.Len() == 0 {
 		dec.finished = true
-		return io.EOF
+
+		// if we've read _only_ an empty string, lets return that
+		// otherwise if we've already read some bytes, and now we get
+		// an empty string, then we are done.
+		if dec.readAnything {
+			return io.EOF
+		}
 	}
+	dec.readAnything = true
 	rootYamlNode.Kind = yaml.ScalarNode
 	rootYamlNode.Tag = "!!str"
 	rootYamlNode.Value = buf.String()

pkg/yqlib/decoder_csv_object.go

@@ -0,0 +1,77 @@
+package yqlib
+
+import (
+	"encoding/csv"
+	"errors"
+	"io"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+type csvObjectDecoder struct {
+	separator rune
+	reader    csv.Reader
+	finished  bool
+}
+
+func NewCSVObjectDecoder(separator rune) Decoder {
+	return &csvObjectDecoder{separator: separator}
+}
+
+func (dec *csvObjectDecoder) Init(reader io.Reader) {
+	dec.reader = *csv.NewReader(reader)
+	dec.reader.Comma = dec.separator
+	dec.finished = false
+}
+
+func (dec *csvObjectDecoder) convertToYamlNode(content string) *yaml.Node {
+	node, err := parseSnippet(content)
+	if err != nil {
+		return createScalarNode(content, content)
+	}
+	return node
+}
+
+func (dec *csvObjectDecoder) createObject(headerRow []string, contentRow []string) *yaml.Node {
+	objectNode := &yaml.Node{Kind: yaml.MappingNode, Tag: "!!map"}
+
+	for i, header := range headerRow {
+		objectNode.Content = append(
+			objectNode.Content,
+			createScalarNode(header, header),
+			dec.convertToYamlNode(contentRow[i]))
+	}
+	return objectNode
+}
+
+func (dec *csvObjectDecoder) Decode(rootYamlNode *yaml.Node) error {
+	if dec.finished {
+		return io.EOF
+	}
+	headerRow, err := dec.reader.Read()
+	log.Debugf(": headerRow%v", headerRow)
+	if err != nil {
+		return err
+	}
+
+	rootArray := &yaml.Node{Kind: yaml.SequenceNode, Tag: "!!seq"}
+
+	contentRow, err := dec.reader.Read()
+
+	for err == nil && len(contentRow) > 0 {
+		log.Debugf("Adding contentRow: %v", contentRow)
+		rootArray.Content = append(rootArray.Content, dec.createObject(headerRow, contentRow))
+		contentRow, err = dec.reader.Read()
+		log.Debugf("Read next contentRow: %v, %v", contentRow, err)
+	}
+	if !errors.Is(err, io.EOF) {
+		return err
+	}
+
+	log.Debugf("finished, contentRow%v", contentRow)
+	log.Debugf("err: %v", err)
+
+	rootYamlNode.Kind = yaml.DocumentNode
+	rootYamlNode.Content = []*yaml.Node{rootArray}
+	return nil
+}

pkg/yqlib/decoder_json.go

@@ -0,0 +1,85 @@
+package yqlib
+
+import (
+	"fmt"
+	"io"
+
+	"github.com/goccy/go-json"
+	yaml "gopkg.in/yaml.v3"
+)
+
+type jsonDecoder struct {
+	decoder json.Decoder
+}
+
+func NewJSONDecoder() Decoder {
+	return &jsonDecoder{}
+}
+
+func (dec *jsonDecoder) Init(reader io.Reader) {
+	dec.decoder = *json.NewDecoder(reader)
+}
+
+func (dec *jsonDecoder) Decode(rootYamlNode *yaml.Node) error {
+
+	var dataBucket interface{}
+	log.Debug("going to decode")
+	err := dec.decoder.Decode(&dataBucket)
+	if err != nil {
+		return err
+	}
+	node, err := dec.convertToYamlNode(dataBucket)
+
+	if err != nil {
+		return err
+	}
+	rootYamlNode.Kind = yaml.DocumentNode
+	rootYamlNode.Content = []*yaml.Node{node}
+	return nil
+}
+
+func (dec *jsonDecoder) convertToYamlNode(data interface{}) (*yaml.Node, error) {
+	switch data := data.(type) {
+	case nil:
+		return createScalarNode(nil, "null"), nil
+	case float64, float32:
+		// json decoder returns ints as float.
+		return parseSnippet(fmt.Sprintf("%v", data))
+	case int, int64, int32, string, bool:
+		return createScalarNode(data, fmt.Sprintf("%v", data)), nil
+	case map[string]interface{}:
+		return dec.parseMap(data)
+	case []interface{}:
+		return dec.parseArray(data)
+	default:
+		return nil, fmt.Errorf("unrecognised type :(")
+	}
+}
+
+func (dec *jsonDecoder) parseMap(dataMap map[string]interface{}) (*yaml.Node, error) {
+
+	var yamlMap = &yaml.Node{Kind: yaml.MappingNode}
+
+	for key, value := range dataMap {
+		yamlValue, err := dec.convertToYamlNode(value)
+		if err != nil {
+			return nil, err
+		}
+		yamlMap.Content = append(yamlMap.Content, createScalarNode(key, fmt.Sprintf("%v", key)), yamlValue)
+	}
+	return yamlMap, nil
+}
+
+func (dec *jsonDecoder) parseArray(dataArray []interface{}) (*yaml.Node, error) {
+
+	var yamlMap = &yaml.Node{Kind: yaml.SequenceNode}
+
+	for _, value := range dataArray {
+		yamlValue, err := dec.convertToYamlNode(value)
+		if err != nil {
+			return nil, err
+		}
+		yamlMap.Content = append(yamlMap.Content, yamlValue)
+	}
+	return yamlMap, nil
+}

pkg/yqlib/decoder_xml.go

@@ -2,6 +2,7 @@ package yqlib
 
 import (
 	"encoding/xml"
+	"errors"
 	"io"
 	"strings"
 	"unicode"
@@ -12,25 +13,37 @@ import (
 
 type xmlDecoder struct {
 	reader          io.Reader
+	readAnything    bool
 	attributePrefix string
 	contentName     string
+	strictMode      bool
+	keepNamespace   bool
+	useRawToken     bool
 	finished        bool
 }
 
-func NewXMLDecoder(attributePrefix string, contentName string) Decoder {
+func NewXMLDecoder(attributePrefix string, contentName string, strictMode bool, keepNamespace bool, useRawToken bool) Decoder {
 	if contentName == "" {
 		contentName = "content"
 	}
-	return &xmlDecoder{attributePrefix: attributePrefix, contentName: contentName, finished: false}
+	return &xmlDecoder{
+		attributePrefix: attributePrefix,
+		contentName:     contentName,
+		finished:        false,
+		strictMode:      strictMode,
+		keepNamespace:   keepNamespace,
+		useRawToken:     useRawToken,
+	}
 }
 
 func (dec *xmlDecoder) Init(reader io.Reader) {
 	dec.reader = reader
+	dec.readAnything = false
 	dec.finished = false
 }
 
 func (dec *xmlDecoder) createSequence(nodes []*xmlNode) (*yaml.Node, error) {
-	yamlNode := &yaml.Node{Kind: yaml.SequenceNode}
+	yamlNode := &yaml.Node{Kind: yaml.SequenceNode, Tag: "!!seq"}
 	for _, child := range nodes {
 		yamlChild, err := dec.convertToYamlNode(child)
 		if err != nil {
@@ -51,7 +64,7 @@ func (dec *xmlDecoder) processComment(c string) string {
 
 func (dec *xmlDecoder) createMap(n *xmlNode) (*yaml.Node, error) {
 	log.Debug("createMap: headC: %v, footC: %v", n.HeadComment, n.FootComment)
-	yamlNode := &yaml.Node{Kind: yaml.MappingNode}
+	yamlNode := &yaml.Node{Kind: yaml.MappingNode, Tag: "!!map"}
 
 	if len(n.Data) > 0 {
 		label := dec.contentName
@@ -135,8 +148,11 @@ func (dec *xmlDecoder) Decode(rootYamlNode *yaml.Node) error {
 		return err
 	} else if firstNode.Tag == "!!null" {
 		dec.finished = true
-		return io.EOF
+		if dec.readAnything {
+			return io.EOF
+		}
 	}
+	dec.readAnything = true
 	rootYamlNode.Kind = yaml.DocumentNode
 	rootYamlNode.Content = []*yaml.Node{firstNode}
 	dec.finished = true
@@ -189,7 +205,7 @@ type element struct {
 // of the map keys.
 func (dec *xmlDecoder) decodeXML(root *xmlNode) error {
 	xmlDec := xml.NewDecoder(dec.reader)
-
+	xmlDec.Strict = dec.strictMode
 	// That will convert the charset if the provided XML is non-UTF-8
 	xmlDec.CharsetReader = charset.NewReaderLabel
 
@@ -199,8 +215,18 @@ func (dec *xmlDecoder) decodeXML(root *xmlNode) error {
 		n:      root,
 	}
 
+	getToken := func() (xml.Token, error) {
+		if dec.useRawToken {
+			return xmlDec.RawToken()
+		}
+		return xmlDec.Token()
+	}
+
 	for {
-		t, _ := xmlDec.Token()
+		t, e := getToken()
+		if e != nil && !errors.Is(e, io.EOF) {
+			return e
+		}
 		if t == nil {
 			break
 		}
@@ -218,6 +244,11 @@ func (dec *xmlDecoder) decodeXML(root *xmlNode) error {
 
 			// Extract attributes as children
 			for _, a := range se.Attr {
+				if dec.keepNamespace {
+					if a.Name.Space != "" {
+						a.Name.Local = a.Name.Space + ":" + a.Name.Local
+					}
+				}
 				elem.n.AddChild(dec.attributePrefix+a.Name.Local, &xmlNode{Data: a.Value})
 			}
 		case xml.CharData:

pkg/yqlib/doc/operators/add.md

@@ -135,7 +135,9 @@ a:
     b:
       - dog
       - mouse
-  a3: {b: [mouse]}
+  a3:
+    b:
+      - mouse
 ```
 
 ## String concatenation

pkg/yqlib/doc/operators/assign-update.md

@@ -107,13 +107,13 @@ c: fieldC
 ```
 then
 ```bash
-yq '(.a, .c) = "potatoe"' sample.yml
+yq '(.a, .c) = "potato"' sample.yml
 ```
 will output
 ```yaml
-a: potatoe
+a: potato
 b: fieldB
-c: potatoe
+c: potato
 ```
 
 ## Update string value
@@ -151,7 +151,7 @@ a:
 ```
 
 ## Update deeply selected results
-Note that the LHS is wrapped in brackets! This is to ensure we dont first filter out the yaml and then update the snippet.
+Note that the LHS is wrapped in brackets! This is to ensure we don't first filter out the yaml and then update the snippet.
 
 Given a sample.yml file of:
 ```yaml
@@ -199,7 +199,8 @@ yq '.a.b |= "bogs"' sample.yml
 ```
 will output
 ```yaml
-{a: {b: bogs}}
+a:
+  b: bogs
 ```
 
 ## Update node value that has an anchor
@@ -229,6 +230,8 @@ yq '.a.b.[0] |= "bogs"' sample.yml
 ```
 will output
 ```yaml
-{a: {b: [bogs]}}
+a:
+  b:
+    - bogs
 ```
 

pkg/yqlib/doc/operators/boolean-operators.md

@@ -10,6 +10,12 @@ The `or` and `and` operators take two parameters and return a boolean result.
 
 These are most commonly used with the `select` operator to filter particular nodes.
 
+## Related Operators
+
+- equals / not equals (`==`, `!=`) operators [here](https://mikefarah.gitbook.io/yq/operators/equals)
+- comparison (`>=`, `<` etc) operators [here](https://mikefarah.gitbook.io/yq/operators/compare)
+- select operator [here](https://mikefarah.gitbook.io/yq/operators/select)
+
 {% hint style="warning" %}
 Note that versions prior to 4.18 require the 'eval/e' command to be specified.&#x20;
 

pkg/yqlib/doc/operators/comment-operators.md

@@ -74,7 +74,6 @@ yq '. foot_comment=.a' sample.yml
 will output
 ```yaml
 a: cat
-
 # cat
 ```
 
@@ -117,6 +116,7 @@ b:
 Given a sample.yml file of:
 ```yaml
 a: cat # meow
+# have a great day
 ```
 then
 ```bash

pkg/yqlib/doc/operators/compare.md

@@ -0,0 +1,106 @@
+# Compare Operators
+
+Comparison operators (`>`, `>=`, `<`, `<=`) can be used for comparing scalar values of the same time.
+
+The following types are currently supported:
+
+- numbers
+- strings
+- datetimes
+
+## Related Operators
+
+- equals / not equals (`==`, `!=`) operators [here](https://mikefarah.gitbook.io/yq/operators/equals)
+- boolean operators (`and`, `or`, `any` etc) [here](https://mikefarah.gitbook.io/yq/operators/boolean-operators)
+- select operator [here](https://mikefarah.gitbook.io/yq/operators/select)
+
+{% hint style="warning" %}
+Note that versions prior to 4.18 require the 'eval/e' command to be specified.&#x20;
+
+`yq e <exp> <file>`
+{% endhint %}
+
+## Compare numbers (>)
+Given a sample.yml file of:
+```yaml
+a: 5
+b: 4
+```
+then
+```bash
+yq '.a > .b' sample.yml
+```
+will output
+```yaml
+true
+```
+
+## Compare equal numbers (>=)
+Given a sample.yml file of:
+```yaml
+a: 5
+b: 5
+```
+then
+```bash
+yq '.a >= .b' sample.yml
+```
+will output
+```yaml
+true
+```
+
+## Compare strings
+Compares strings by their bytecode.
+
+Given a sample.yml file of:
+```yaml
+a: zoo
+b: apple
+```
+then
+```bash
+yq '.a > .b' sample.yml
+```
+will output
+```yaml
+true
+```
+
+## Compare date times
+You can compare date times. Assumes RFC3339 date time format, see [date-time operators](https://mikefarah.gitbook.io/yq/operators/date-time-operators) for more information.
+
+Given a sample.yml file of:
+```yaml
+a: 2021-01-01T03:10:00Z
+b: 2020-01-01T03:10:00Z
+```
+then
+```bash
+yq '.a > .b' sample.yml
+```
+will output
+```yaml
+true
+```
+
+## Both sides are null: > is false
+Running
+```bash
+yq --null-input '.a > .b'
+```
+will output
+```yaml
+false
+```
+
+## Both sides are null: >= is true
+Running
+```bash
+yq --null-input '.a >= .b'
+```
+will output
+```yaml
+true
+```
+

pkg/yqlib/doc/operators/create-collect-into-object.md

@@ -86,3 +86,16 @@ will output
 wrap: frog
 ```
 
+## Creating yaml from scratch with multiple objects
+Running
+```bash
+yq --null-input '(.a.b = "foo") | (.d.e = "bar")'
+```
+will output
+```yaml
+a:
+  b: foo
+d:
+  e: bar
+```
+

pkg/yqlib/doc/operators/encode-decode.md

@@ -4,21 +4,21 @@ Encode operators will take the piped in object structure and encode it as a stri
 
 Note that you can optionally pass an indent value to the encode functions (see below).
 
-These operators are useful to process yaml documents that have stringified embeded yaml/json/props in them.
+These operators are useful to process yaml documents that have stringified embedded yaml/json/props in them.
 
 
 | Format | Decode (from string) | Encode (to string) |
 | --- | -- | --|
 | Yaml | from_yaml | to_yaml(i)/@yaml |
 | JSON | from_json | to_json(i)/@json |
-| Properties |  | to_props/@props |
-| CSV |  | to_csv/@csv |
-| TSV |  | to_tsv/@tsv |
+| Properties | from_props/@propsd  | to_props/@props |
+| CSV | from_csv/@csvd | to_csv/@csv |
+| TSV | from_tsv/@tsvd | to_tsv/@tsv |
 | XML | from_xml | to_xml(i)/@xml |
 | Base64 | @base64d | @base64 |
 
 
-CSV and TSV format both accept either a single array or scalars (representing a single row), or an array of array of scalars (representing multiple rows). 
+See CSV and TSV [documentation](https://mikefarah.gitbook.io/yq/usage/csv-tsv) for accepted formats.
 
 XML uses the `--xml-attribute-prefix` and `xml-content-name` flags to identify attributes and content fields.
 
@@ -123,6 +123,60 @@ b: |
   cool = thing
 ```
 
+## Decode props encoded string
+Given a sample.yml file of:
+```yaml
+a: |-
+  cats=great
+  dogs=cool as well
+```
+then
+```bash
+yq '.a |= @propsd' sample.yml
+```
+will output
+```yaml
+a:
+  cats: great
+  dogs: cool as well
+```
+
+## Decode csv encoded string
+Given a sample.yml file of:
+```yaml
+a: |-
+  cats,dogs
+  great,cool as well
+```
+then
+```bash
+yq '.a |= @csvd' sample.yml
+```
+will output
+```yaml
+a:
+  - cats: great
+    dogs: cool as well
+```
+
+## Decode tsv encoded string
+Given a sample.yml file of:
+```yaml
+a: |-
+  cats	dogs
+  great	cool as well
+```
+then
+```bash
+yq '.a |= @tsvd' sample.yml
+```
+will output
+```yaml
+a:
+  - cats: great
+    dogs: cool as well
+```
+
 ## Encode value as yaml string
 Indent defaults to 2
 

pkg/yqlib/doc/operators/env-variable-operators.md

@@ -3,11 +3,24 @@
 These operators are used to handle environment variables usage in expressions and documents. While environment variables can, of course, be passed in via your CLI with string interpolation, this often comes with complex quote escaping and can be tricky to write and read. 
 
 There are three operators:
+
 -  `env` which takes a single environment variable name and parse the variable as a yaml node (be it a map, array, string, number of boolean) 
 - `strenv` which also takes a single environment variable name, and always parses the variable as a string.
 - `envsubst` which you pipe strings into and it interpolates environment variables in strings using [envsubst](https://github.com/a8m/envsubst). 
 
 
+## EnvSubst Options
+You can optionally pass envsubst any of the following options:
+
+  - nu: NoUnset, this will fail if there are any referenced variables that are not set
+  - ne: NoEmpty, this will fail if there are any referenced variables that are empty
+  - ff: FailFast, this will abort on the first failure (rather than collect all the errors)
+
+E.g:
+`envsubst(ne, ff)` will fail on the first empty variable.
+
+See [Imposing Restrictions](https://github.com/a8m/envsubst#imposing-restrictions) in the `envsubst` documentation for more information, and below for examples.
+
 ## Tip
 To replace environment variables across all values in a document, `envsubst` can be used with the recursive descent operator
 as follows:
@@ -133,23 +146,83 @@ the cat meows
 ## Replace strings with envsubst, missing variables
 Running
 ```bash
-myenv="cat" yq --null-input '"the ${myenvnonexisting} meows" | envsubst'
+yq --null-input '"the ${myenvnonexisting} meows" | envsubst'
 ```
 will output
 ```yaml
 the  meows
 ```
 
+## Replace strings with envsubst(nu), missing variables
+(nu) not unset, will fail if there are unset (missing) variables
+
+Running
+```bash
+yq --null-input '"the ${myenvnonexisting} meows" | envsubst(nu)'
+```
+will output
+```bash
+Error: variable ${myenvnonexisting} not set
+```
+
+## Replace strings with envsubst(ne), missing variables
+(ne) not empty, only validates set variables
+
+Running
+```bash
+yq --null-input '"the ${myenvnonexisting} meows" | envsubst(ne)'
+```
+will output
+```yaml
+the  meows
+```
+
+## Replace strings with envsubst(ne), empty variable
+(ne) not empty, will fail if a references variable is empty
+
+Running
+```bash
+myenv="" yq --null-input '"the ${myenv} meows" | envsubst(ne)'
+```
+will output
+```bash
+Error: variable ${myenv} set but empty
+```
+
 ## Replace strings with envsubst, missing variables with defaults
 Running
 ```bash
-myenv="cat" yq --null-input '"the ${myenvnonexisting-dog} meows" | envsubst'
+yq --null-input '"the ${myenvnonexisting-dog} meows" | envsubst'
 ```
 will output
 ```yaml
 the dog meows
 ```
 
+## Replace strings with envsubst(nu), missing variables with defaults
+Having a default specified skips over the missing variable.
+
+Running
+```bash
+yq --null-input '"the ${myenvnonexisting-dog} meows" | envsubst(nu)'
+```
+will output
+```yaml
+the dog meows
+```
+
+## Replace strings with envsubst(ne), missing variables with defaults
+Fails, because the variable is explicitly set to blank.
+
+Running
+```bash
+myEmptyEnv="" yq --null-input '"the ${myEmptyEnv-dog} meows" | envsubst(ne)'
+```
+will output
+```bash
+Error: variable ${myEmptyEnv} set but empty
+```
+
 ## Replace string environment variable in document
 Given a sample.yml file of:
 ```yaml
@@ -164,3 +237,26 @@ will output
 v: cat meow
 ```
 
+## (Default) Return all envsubst errors
+By default, all errors are returned at once.
+
+Running
+```bash
+yq --null-input '"the ${notThere} ${alsoNotThere}" | envsubst(nu)'
+```
+will output
+```bash
+Error: variable ${notThere} not set
+variable ${alsoNotThere} not set
+```
+
+## Fail fast, return the first envsubst error (and abort)
+Running
+```bash
+yq --null-input '"the ${notThere} ${alsoNotThere}" | envsubst(nu,ff)'
+```
+will output
+```bash
+Error: variable ${notThere} not set
+```
+

pkg/yqlib/doc/operators/equals.md

@@ -1,4 +1,4 @@
-# Equals
+# Equals / Not Equals
 
 This is a boolean operator that will return `true` if the LHS is equal to the RHS and `false` otherwise.
 
@@ -12,6 +12,15 @@ It is most often used with the select operator to find particular nodes:
 select(.a == .b)
 ```
 
+The not equals `!=` operator returns `false` if the LHS is equal to the RHS.
+
+## Related Operators
+
+- comparison (`>=`, `<` etc) operators [here](https://mikefarah.gitbook.io/yq/operators/compare)
+- boolean operators (`and`, `or`, `any` etc) [here](https://mikefarah.gitbook.io/yq/operators/boolean-operators)
+- select operator [here](https://mikefarah.gitbook.io/yq/operators/select)
+
+
 {% hint style="warning" %}
 Note that versions prior to 4.18 require the 'eval/e' command to be specified.&#x20;
 
@@ -72,7 +81,7 @@ true
 false
 ```
 
-## Dont match number
+## Don't match number
 Given a sample.yml file of:
 ```yaml
 - 3
@@ -100,7 +109,7 @@ will output
 true
 ```
 
-## Non exisitant key doesn't equal a value
+## Non existent key doesn't equal a value
 Given a sample.yml file of:
 ```yaml
 a: frog

pkg/yqlib/doc/operators/error.md

@@ -0,0 +1,56 @@
+# Error
+
+Use this operation to short-circuit expressions. Useful for validation.
+
+{% hint style="warning" %}
+Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
+
+`yq e <exp> <file>`
+{% endhint %}
+
+## Validate a particular value
+Given a sample.yml file of:
+```yaml
+a: hello
+```
+then
+```bash
+yq 'select(.a == "howdy") or error(".a [" + .a + "] is not howdy!")' sample.yml
+```
+will output
+```bash
+Error: .a [hello] is not howdy!
+```
+
+## Validate the environment variable is a number - invalid
+Running
+```bash
+numberOfCats="please" yq --null-input 'env(numberOfCats) | select(tag == "!!int") or error("numberOfCats is not a number :(")'
+```
+will output
+```bash
+Error: numberOfCats is not a number :(
+```
+
+## Validate the environment variable is a number - valid
+`with` can be a convenient way of encapsulating validation.
+
+Given a sample.yml file of:
+```yaml
+name: Bob
+favouriteAnimal: cat
+```
+then
+```bash
+numberOfCats="3" yq '
+	with(env(numberOfCats); select(tag == "!!int") or error("numberOfCats is not a number :(")) | 
+	.numPets = env(numberOfCats)
+' sample.yml
+```
+will output
+```yaml
+name: Bob
+favouriteAnimal: cat
+numPets: 3
+```
+

pkg/yqlib/doc/operators/headers/boolean-operators.md

@@ -9,3 +9,9 @@ The `or` and `and` operators take two parameters and return a boolean result.
 `any_c(condition)` and `all_c(condition)` are like `any` and `all` but they take a condition expression that is used against each element to determine if it's `true`. Note: in `jq` you can simply pass a condition to `any` or `all` and it simply works - `yq` isn't that clever..yet
 
 These are most commonly used with the `select` operator to filter particular nodes.
+
+## Related Operators
+
+- equals / not equals (`==`, `!=`) operators [here](https://mikefarah.gitbook.io/yq/operators/equals)
+- comparison (`>=`, `<` etc) operators [here](https://mikefarah.gitbook.io/yq/operators/compare)
+- select operator [here](https://mikefarah.gitbook.io/yq/operators/select)

pkg/yqlib/doc/operators/headers/compare.md

@@ -0,0 +1,15 @@
+# Compare Operators
+
+Comparison operators (`>`, `>=`, `<`, `<=`) can be used for comparing scalar values of the same time.
+
+The following types are currently supported:
+
+- numbers
+- strings
+- datetimes
+
+## Related Operators
+
+- equals / not equals (`==`, `!=`) operators [here](https://mikefarah.gitbook.io/yq/operators/equals)
+- boolean operators (`and`, `or`, `any` etc) [here](https://mikefarah.gitbook.io/yq/operators/boolean-operators)
+- select operator [here](https://mikefarah.gitbook.io/yq/operators/select)

pkg/yqlib/doc/operators/headers/encode-decode.md

@@ -4,21 +4,21 @@ Encode operators will take the piped in object structure and encode it as a stri
 
 Note that you can optionally pass an indent value to the encode functions (see below).
 
-These operators are useful to process yaml documents that have stringified embeded yaml/json/props in them.
+These operators are useful to process yaml documents that have stringified embedded yaml/json/props in them.
 
 
 | Format | Decode (from string) | Encode (to string) |
 | --- | -- | --|
 | Yaml | from_yaml | to_yaml(i)/@yaml |
 | JSON | from_json | to_json(i)/@json |
-| Properties |  | to_props/@props |
-| CSV |  | to_csv/@csv |
-| TSV |  | to_tsv/@tsv |
+| Properties | from_props/@propsd  | to_props/@props |
+| CSV | from_csv/@csvd | to_csv/@csv |
+| TSV | from_tsv/@tsvd | to_tsv/@tsv |
 | XML | from_xml | to_xml(i)/@xml |
 | Base64 | @base64d | @base64 |
 
 
-CSV and TSV format both accept either a single array or scalars (representing a single row), or an array of array of scalars (representing multiple rows). 
+See CSV and TSV [documentation](https://mikefarah.gitbook.io/yq/usage/csv-tsv) for accepted formats.
 
 XML uses the `--xml-attribute-prefix` and `xml-content-name` flags to identify attributes and content fields.
 

pkg/yqlib/doc/operators/headers/env-variable-operators.md

@@ -3,11 +3,24 @@
 These operators are used to handle environment variables usage in expressions and documents. While environment variables can, of course, be passed in via your CLI with string interpolation, this often comes with complex quote escaping and can be tricky to write and read. 
 
 There are three operators:
+
 -  `env` which takes a single environment variable name and parse the variable as a yaml node (be it a map, array, string, number of boolean) 
 - `strenv` which also takes a single environment variable name, and always parses the variable as a string.
 - `envsubst` which you pipe strings into and it interpolates environment variables in strings using [envsubst](https://github.com/a8m/envsubst). 
 
 
+## EnvSubst Options
+You can optionally pass envsubst any of the following options:
+
+  - nu: NoUnset, this will fail if there are any referenced variables that are not set
+  - ne: NoEmpty, this will fail if there are any referenced variables that are empty
+  - ff: FailFast, this will abort on the first failure (rather than collect all the errors)
+
+E.g:
+`envsubst(ne, ff)` will fail on the first empty variable.
+
+See [Imposing Restrictions](https://github.com/a8m/envsubst#imposing-restrictions) in the `envsubst` documentation for more information, and below for examples.
+
 ## Tip
 To replace environment variables across all values in a document, `envsubst` can be used with the recursive descent operator
 as follows:

pkg/yqlib/doc/operators/headers/equals.md

@@ -1,4 +1,4 @@
-# Equals
+# Equals / Not Equals
 
 This is a boolean operator that will return `true` if the LHS is equal to the RHS and `false` otherwise.
 
@@ -11,3 +11,12 @@ It is most often used with the select operator to find particular nodes:
 ```
 select(.a == .b)
 ```
+
+The not equals `!=` operator returns `false` if the LHS is equal to the RHS.
+
+## Related Operators
+
+- comparison (`>=`, `<` etc) operators [here](https://mikefarah.gitbook.io/yq/operators/compare)
+- boolean operators (`and`, `or`, `any` etc) [here](https://mikefarah.gitbook.io/yq/operators/boolean-operators)
+- select operator [here](https://mikefarah.gitbook.io/yq/operators/select)
+

pkg/yqlib/doc/operators/headers/error.md

@@ -0,0 +1,3 @@
+# Error
+
+Use this operation to short-circuit expressions. Useful for validation.

pkg/yqlib/doc/operators/headers/multiply-merge.md

@@ -15,9 +15,22 @@ You can control how objects are merged by using one or more of the following fla
 - `?` only merge _existing_ fields
 - `n` only merge _new_ fields
 
-### Merging files
+
+### Merge two files together
+This uses the load operator to merge file2 into file1.
+```bash
+yq '. *= load("file2.yml")' file1.yml
+```
+
+### Merging all files
 Note the use of `eval-all` to ensure all documents are loaded into memory.
 
 ```bash
-yq eval-all 'select(fileIndex == 0) * select(fileIndex == 1)' file1.yaml file2.yaml
+yq eval-all '. as $item ireduce ({}; . * $item )' *.yml
 ```
+
+# Merging complex arrays together by a key field
+By default - `yq` merge is naive. It merges maps when they match the key name, and arrays are merged either by appending them together, or merging the entries by their position in the array.
+
+For more complex array merging (e.g. merging items that match on a certain key) please see the example [here](https://mikefarah.gitbook.io/yq/operators/multiply-merge#merge-arrays-of-objects-together-matching-on-a-key)
+

pkg/yqlib/doc/operators/headers/reduce.md

@@ -19,4 +19,4 @@ On the RHS there is `<init>`, the starting value of the accumulator and `<block>
 ## yq vs jq syntax
 Reduce syntax in `yq` is a little different from `jq` - as `yq` (currently) isn't as sophisticated as `jq` and its only supports infix notation (e.g. a + b, where the operator is in the middle of the two parameters) - where as `jq` uses a mix of infix notation with _prefix_ notation (e.g. `reduce a b` is like writing `+ a b`).
 
-To that end, the reduce operator is called `ireduce` for backwards compatability if a `jq` like prefix version of `reduce` is ever added.
+To that end, the reduce operator is called `ireduce` for backwards compatibility if a `jq` like prefix version of `reduce` is ever added.

pkg/yqlib/doc/operators/headers/select.md

@@ -1,3 +1,9 @@
 # Select
 
 Select is used to filter arrays and maps by a boolean expression.
+
+## Related Operators
+
+- equals / not equals (`==`, `!=`) operators [here](https://mikefarah.gitbook.io/yq/operators/equals)
+- comparison (`>=`, `<` etc) operators [here](https://mikefarah.gitbook.io/yq/operators/compare)
+- boolean operators (`and`, `or`, `any` etc) [here](https://mikefarah.gitbook.io/yq/operators/boolean-operators)

pkg/yqlib/doc/operators/headers/string-operators.md

@@ -1,8 +1,21 @@
 # String Operators
 
 ## RegEx
-This uses golangs native regex functions under the hood - See https://github.com/google/re2/wiki/Syntax for the supported syntax.
+This uses golangs native regex functions under the hood - See their [docs](https://github.com/google/re2/wiki/Syntax) for the supported syntax.
 
+Case insensitive tip: prefix the regex with `(?i)` - e.g. `test("(?i)cats)"`.
+
+### match(regEx)
+This operator returns the substring match details of the given regEx.
+
+### capture(regEx)
+Capture returns named RegEx capture groups in a map. Can be more convenient than `match` depending on what you are doing.
+
+## test(regEx)
+Returns true if the string matches the RegEx, false otherwise.
+
+## sub(regEx, replacement)
+Substitutes matched substrings. The first parameter is the regEx to match substrings within the original string. The second is a what to replace those matches with. This can refer to capture groups from the first RegEx.
 
 ## String blocks, bash and newlines
 Bash is notorious for chomping on precious trailing newline characters, making it tricky to set strings with newlines properly. In particular, the `$( exp )` _will trim trailing newlines_.

pkg/yqlib/doc/operators/headers/unique.md

@@ -1,3 +1,4 @@
 # Unique
 
-This is used to filter out duplicated items in an array.
+This is used to filter out duplicated items in an array. Note that the original order of the array is maintained.
+

pkg/yqlib/doc/operators/multiply-merge.md

@@ -15,13 +15,26 @@ You can control how objects are merged by using one or more of the following fla
 - `?` only merge _existing_ fields
 - `n` only merge _new_ fields
 
-### Merging files
+
+### Merge two files together
+This uses the load operator to merge file2 into file1.
+```bash
+yq '. *= load("file2.yml")' file1.yml
+```
+
+### Merging all files
 Note the use of `eval-all` to ensure all documents are loaded into memory.
 
 ```bash
-yq eval-all 'select(fileIndex == 0) * select(fileIndex == 1)' file1.yaml file2.yaml
+yq eval-all '. as $item ireduce ({}; . * $item )' *.yml
 ```
 
+# Merging complex arrays together by a key field
+By default - `yq` merge is naive. It merges maps when they match the key name, and arrays are merged either by appending them together, or merging the entries by their position in the array.
+
+For more complex array merging (e.g. merging items that match on a certain key) please see the example [here](https://mikefarah.gitbook.io/yq/operators/multiply-merge#merge-arrays-of-objects-together-matching-on-a-key)
+
+
 {% hint style="warning" %}
 Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
 

pkg/yqlib/doc/operators/reduce.md

@@ -19,7 +19,7 @@ On the RHS there is `<init>`, the starting value of the accumulator and `<block>
 ## yq vs jq syntax
 Reduce syntax in `yq` is a little different from `jq` - as `yq` (currently) isn't as sophisticated as `jq` and its only supports infix notation (e.g. a + b, where the operator is in the middle of the two parameters) - where as `jq` uses a mix of infix notation with _prefix_ notation (e.g. `reduce a b` is like writing `+ a b`).
 
-To that end, the reduce operator is called `ireduce` for backwards compatability if a `jq` like prefix version of `reduce` is ever added.
+To that end, the reduce operator is called `ireduce` for backwards compatibility if a `jq` like prefix version of `reduce` is ever added.
 
 {% hint style="warning" %}
 Note that versions prior to 4.18 require the 'eval/e' command to be specified.&#x20;

pkg/yqlib/doc/operators/select.md

@@ -2,6 +2,12 @@
 
 Select is used to filter arrays and maps by a boolean expression.
 
+## Related Operators
+
+- equals / not equals (`==`, `!=`) operators [here](https://mikefarah.gitbook.io/yq/operators/equals)
+- comparison (`>=`, `<` etc) operators [here](https://mikefarah.gitbook.io/yq/operators/compare)
+- boolean operators (`and`, `or`, `any` etc) [here](https://mikefarah.gitbook.io/yq/operators/boolean-operators)
+
 {% hint style="warning" %}
 Note that versions prior to 4.18 require the 'eval/e' command to be specified.&#x20;
 

pkg/yqlib/doc/operators/string-operators.md

@@ -1,8 +1,21 @@
 # String Operators
 
 ## RegEx
-This uses golangs native regex functions under the hood - See https://github.com/google/re2/wiki/Syntax for the supported syntax.
+This uses golangs native regex functions under the hood - See their [docs](https://github.com/google/re2/wiki/Syntax) for the supported syntax.
 
+Case insensitive tip: prefix the regex with `(?i)` - e.g. `test("(?i)cats)"`.
+
+### match(regEx)
+This operator returns the substring match details of the given regEx.
+
+### capture(regEx)
+Capture returns named RegEx capture groups in a map. Can be more convenient than `match` depending on what you are doing.
+
+## test(regEx)
+Returns true if the string matches the RegEx, false otherwise.
+
+## sub(regEx, replacement)
+Substitutes matched substrings. The first parameter is the regEx to match substrings within the original string. The second is a what to replace those matches with. This can refer to capture groups from the first RegEx.
 
 ## String blocks, bash and newlines
 Bash is notorious for chomping on precious trailing newline characters, making it tricky to set strings with newlines properly. In particular, the `$( exp )` _will trim trailing newlines_.
@@ -253,7 +266,7 @@ will output
 ```
 
 ## Test using regex
-Like jq'q equivalent, this works like match but only returns true/false instead of full match details
+Like jq's equivalent, this works like match but only returns true/false instead of full match details
 
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/operators/tag.md

@@ -31,6 +31,29 @@ will output
 !!seq
 ```
 
+## type is an alias for tag
+Given a sample.yml file of:
+```yaml
+a: cat
+b: 5
+c: 3.2
+e: true
+f: []
+```
+then
+```bash
+yq '.. | type' sample.yml
+```
+will output
+```yaml
+!!map
+!!str
+!!int
+!!float
+!!bool
+!!seq
+```
+
 ## Set custom tag
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/doc/operators/unique.md

@@ -1,6 +1,7 @@
 # Unique
 
-This is used to filter out duplicated items in an array.
+This is used to filter out duplicated items in an array. Note that the original order of the array is maintained.
+
 
 {% hint style="warning" %}
 Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
@@ -9,10 +10,12 @@ Note that versions prior to 4.18 require the 'eval/e' command to be specified.&#
 {% endhint %}
 
 ## Unique array of scalars (string/numbers)
+Note that unique maintains the original order of the array.
+
 Given a sample.yml file of:
 ```yaml
-- 1
 - 2
+- 1
 - 3
 - 2
 ```
@@ -22,8 +25,8 @@ yq 'unique' sample.yml
 ```
 will output
 ```yaml
-- 1
 - 2
+- 1
 - 3
 ```
 

pkg/yqlib/doc/operators/variable-operators.md

@@ -46,7 +46,7 @@ Example taken from [jq](https://stedolan.github.io/jq/manual/#Variable/SymbolicB
 Given a sample.yml file of:
 ```yaml
 "posts":
-  - "title": Frist psot
+  - "title": First post
     "author": anon
   - "title": A well-written article
     "author": person1
@@ -60,7 +60,7 @@ yq '.realnames as $names | .posts[] | {"title":.title, "author": $names[.author]
 ```
 will output
 ```yaml
-title: Frist psot
+title: First post
 author: Anonymous Coward
 title: A well-written article
 author: Person McPherson

pkg/yqlib/doc/usage/convert.md

@@ -1,6 +1,8 @@
 # JSON
 
-Encode and decode to and from JSON. Note that YAML is a _superset_ of JSON - so `yq` can read any json file without doing anything special.
+Encode and decode to and from JSON. Note that, unless you have multiple JSON documents in a single file, YAML is a _superset_ of JSON - so `yq` can read any json file without doing anything special.
+
+If you do have mulitple JSON documents in a single file (e.g. NDJSON) then you will need to explicity use the json parser `-p=json`.
 
 This means you don't need to 'convert' a JSON file to YAML - however if you want idiomatic YAML styling, then you can use the `-P/--prettyPrint` flag, see examples below.
 
@@ -130,3 +132,129 @@ will output
 {"whatever":"cat"}
 ```
 
+## Roundtrip NDJSON
+Unfortunately the json encoder strips leading spaces of values.
+
+Given a sample.json file of:
+```json
+{"this": "is a multidoc json file"}
+{"each": ["line is a valid json document"]}
+{"a number": 4}
+
+```
+then
+```bash
+yq -p=json -o=json -I=0 sample.json
+```
+will output
+```yaml
+{"this":"is a multidoc json file"}
+{"each":["line is a valid json document"]}
+{"a number":4}
+```
+
+## Roundtrip multi-document JSON
+The NDJSON parser can also handle multiple multi-line json documents in a single file!
+
+Given a sample.json file of:
+```json
+{
+	"this": "is a multidoc json file"
+}
+{
+	"it": [
+		"has",
+		"consecutive",
+		"json documents"
+	]
+}
+{
+	"a number": 4
+}
+
+```
+then
+```bash
+yq -p=json -o=json -I=2 sample.json
+```
+will output
+```yaml
+{
+  "this": "is a multidoc json file"
+}
+{
+  "it": [
+    "has",
+    "consecutive",
+    "json documents"
+  ]
+}
+{
+  "a number": 4
+}
+```
+
+## Update a specific document in a multi-document json
+Documents are indexed by the `documentIndex` or `di` operator.
+
+Given a sample.json file of:
+```json
+{"this": "is a multidoc json file"}
+{"each": ["line is a valid json document"]}
+{"a number": 4}
+
+```
+then
+```bash
+yq -p=json -o=json -I=0 '(select(di == 1) | .each ) += "cool"' sample.json
+```
+will output
+```yaml
+{"this":"is a multidoc json file"}
+{"each":["line is a valid json document","cool"]}
+{"a number":4}
+```
+
+## Find and update a specific document in a multi-document json
+Use expressions as you normally would.
+
+Given a sample.json file of:
+```json
+{"this": "is a multidoc json file"}
+{"each": ["line is a valid json document"]}
+{"a number": 4}
+
+```
+then
+```bash
+yq -p=json -o=json -I=0 '(select(has("each")) | .each ) += "cool"' sample.json
+```
+will output
+```yaml
+{"this":"is a multidoc json file"}
+{"each":["line is a valid json document","cool"]}
+{"a number":4}
+```
+
+## Decode NDJSON
+Given a sample.json file of:
+```json
+{"this": "is a multidoc json file"}
+{"each": ["line is a valid json document"]}
+{"a number": 4}
+
+```
+then
+```bash
+yq -p=json sample.json
+```
+will output
+```yaml
+this: is a multidoc json file
+---
+each:
+    - line is a valid json document
+---
+a number: 4
+```
+

pkg/yqlib/doc/usage/csv-tsv.md

@@ -0,0 +1,214 @@
+# CSV
+Encode/Decode/Roundtrip CSV and TSV files.
+
+## Encode 
+Currently supports arrays of homogenous flat objects, that is: no nesting and it assumes the _first_ object has all the keys required:
+
+```yaml
+- name: Bobo
+  type: dog
+- name: Fifi
+  type: cat
+```
+
+As well as arrays of arrays of scalars (strings/numbers/booleans):
+
+```yaml
+- [Bobo, dog]
+- [Fifi, cat]
+```
+
+## Decode
+Decode assumes the first CSV/TSV row is the header row, and all rows beneath are the entries.
+The data will be coded into an array of objects, using the header rows as keys.
+
+```csv
+name,type
+Bobo,dog
+Fifi,cat
+```
+
+
+{% hint style="warning" %}
+Note that versions prior to 4.18 require the 'eval/e' command to be specified. 
+
+`yq e <exp> <file>`
+{% endhint %}
+
+## Encode CSV simple
+Given a sample.yml file of:
+```yaml
+- [i, like, csv]
+- [because, excel, is, cool]
+```
+then
+```bash
+yq -o=csv sample.yml
+```
+will output
+```csv
+i,like,csv
+because,excel,is,cool
+```
+
+## Encode TSV simple
+Given a sample.yml file of:
+```yaml
+- [i, like, csv]
+- [because, excel, is, cool]
+```
+then
+```bash
+yq -o=tsv sample.yml
+```
+will output
+```tsv
+i	like	csv
+because	excel	is	cool
+```
+
+## Encode array of objects to csv
+Given a sample.yml file of:
+```yaml
+- name: Gary
+  numberOfCats: 1
+  likesApples: true
+  height: 168.8
+- name: Samantha's Rabbit
+  numberOfCats: 2
+  likesApples: false
+  height: -188.8
+
+```
+then
+```bash
+yq -o=csv sample.yml
+```
+will output
+```csv
+name,numberOfCats,likesApples,height
+Gary,1,true,168.8
+Samantha's Rabbit,2,false,-188.8
+```
+
+## Encode array of objects to custom csv format
+Add the header row manually, then the we convert each object into an array of values - resulting in an array of arrays. Pick the columns and call the header whatever you like.
+
+Given a sample.yml file of:
+```yaml
+- name: Gary
+  numberOfCats: 1
+  likesApples: true
+  height: 168.8
+- name: Samantha's Rabbit
+  numberOfCats: 2
+  likesApples: false
+  height: -188.8
+
+```
+then
+```bash
+yq -o=csv '[["Name", "Number of Cats"]] +  [.[] | [.name, .numberOfCats ]]' sample.yml
+```
+will output
+```csv
+Name,Number of Cats
+Gary,1
+Samantha's Rabbit,2
+```
+
+## Encode array of objects to csv - missing fields behaviour
+First entry is used to determine the headers, and it is missing 'likesApples', so it is not included in the csv. Second entry does not have 'numberOfCats' so that is blank
+
+Given a sample.yml file of:
+```yaml
+- name: Gary
+  numberOfCats: 1
+  height: 168.8
+- name: Samantha's Rabbit
+  height: -188.8
+  likesApples: false
+
+```
+then
+```bash
+yq -o=csv sample.yml
+```
+will output
+```csv
+name,numberOfCats,height
+Gary,1,168.8
+Samantha's Rabbit,,-188.8
+```
+
+## Parse CSV into an array of objects
+First row is assumed to be the header row.
+
+Given a sample.csv file of:
+```csv
+name,numberOfCats,likesApples,height
+Gary,1,true,168.8
+Samantha's Rabbit,2,false,-188.8
+
+```
+then
+```bash
+yq -p=csv sample.csv
+```
+will output
+```yaml
+- name: Gary
+  numberOfCats: 1
+  likesApples: true
+  height: 168.8
+- name: Samantha's Rabbit
+  numberOfCats: 2
+  likesApples: false
+  height: -188.8
+```
+
+## Parse TSV into an array of objects
+First row is assumed to be the header row.
+
+Given a sample.tsv file of:
+```tsv
+name	numberOfCats	likesApples	height
+Gary	1	true	168.8
+Samantha's Rabbit	2	false	-188.8
+
+```
+then
+```bash
+yq -p=tsv sample.tsv
+```
+will output
+```yaml
+- name: Gary
+  numberOfCats: 1
+  likesApples: true
+  height: 168.8
+- name: Samantha's Rabbit
+  numberOfCats: 2
+  likesApples: false
+  height: -188.8
+```
+
+## Round trip
+Given a sample.csv file of:
+```csv
+name,numberOfCats,likesApples,height
+Gary,1,true,168.8
+Samantha's Rabbit,2,false,-188.8
+
+```
+then
+```bash
+yq -p=csv -o=csv '(.[] | select(.name == "Gary") | .numberOfCats) = 3' sample.csv
+```
+will output
+```csv
+name,numberOfCats,likesApples,height
+Gary,3,true,168.8
+Samantha's Rabbit,2,false,-188.8
+```
+

pkg/yqlib/doc/usage/headers/convert.md

@@ -1,5 +1,7 @@
 # JSON
 
-Encode and decode to and from JSON. Note that YAML is a _superset_ of JSON - so `yq` can read any json file without doing anything special.
+Encode and decode to and from JSON. Note that, unless you have multiple JSON documents in a single file, YAML is a _superset_ of JSON - so `yq` can read any json file without doing anything special.
+
+If you do have mulitple JSON documents in a single file (e.g. NDJSON) then you will need to explicity use the json parser `-p=json`.
 
 This means you don't need to 'convert' a JSON file to YAML - however if you want idiomatic YAML styling, then you can use the `-P/--prettyPrint` flag, see examples below.

pkg/yqlib/doc/usage/headers/csv-tsv.md

@@ -0,0 +1,30 @@
+# CSV
+Encode/Decode/Roundtrip CSV and TSV files.
+
+## Encode 
+Currently supports arrays of homogenous flat objects, that is: no nesting and it assumes the _first_ object has all the keys required:
+
+```yaml
+- name: Bobo
+  type: dog
+- name: Fifi
+  type: cat
+```
+
+As well as arrays of arrays of scalars (strings/numbers/booleans):
+
+```yaml
+- [Bobo, dog]
+- [Fifi, cat]
+```
+
+## Decode
+Decode assumes the first CSV/TSV row is the header row, and all rows beneath are the entries.
+The data will be coded into an array of objects, using the header rows as keys.
+
+```csv
+name,type
+Bobo,dog
+Fifi,cat
+```
+

pkg/yqlib/doc/usage/headers/properties.md

@@ -1,5 +1,5 @@
 # Properties
 
-Encode to a property file (decode not yet supported). Line comments on value nodes will be copied across.
+Encode/Decode/Roundtrip to/from a property file. Line comments on value nodes will be copied across.
 
 By default, empty maps and arrays are not encoded - see below for an example on how to encode a value for these.

pkg/yqlib/doc/usage/properties.md

@@ -1,6 +1,6 @@
 # Properties
 
-Encode to a property file (decode not yet supported). Line comments on value nodes will be copied across.
+Encode/Decode/Roundtrip to/from a property file. Line comments on value nodes will be copied across.
 
 By default, empty maps and arrays are not encoded - see below for an example on how to encode a value for these.
 
@@ -17,7 +17,7 @@ Given a sample.yml file of:
 ```yaml
 # block comments don't come through
 person: # neither do comments on maps
-    name: Mike # comments on values appear
+    name: Mike Wazowski # comments on values appear
     pets: 
     - cat # comments on array values appear
     food: [pizza] # comments on arrays do not
@@ -32,7 +32,36 @@ yq -o=props sample.yml
 will output
 ```properties
 # comments on values appear
-person.name = Mike
+person.name = Mike Wazowski
+
+# comments on array values appear
+person.pets.0 = cat
+person.food.0 = pizza
+```
+
+## Encode properties: scalar encapsulation
+Note that string values with blank characters in them are encapsulated with double quotes
+
+Given a sample.yml file of:
+```yaml
+# block comments don't come through
+person: # neither do comments on maps
+    name: Mike Wazowski # comments on values appear
+    pets: 
+    - cat # comments on array values appear
+    food: [pizza] # comments on arrays do not
+emptyArray: []
+emptyMap: []
+
+```
+then
+```bash
+yq -o=props --unwrapScalar=false sample.yml
+```
+will output
+```properties
+# comments on values appear
+person.name = "Mike Wazowski"
 
 # comments on array values appear
 person.pets.0 = cat
@@ -44,7 +73,7 @@ Given a sample.yml file of:
 ```yaml
 # block comments don't come through
 person: # neither do comments on maps
-    name: Mike # comments on values appear
+    name: Mike Wazowski # comments on values appear
     pets: 
     - cat # comments on array values appear
     food: [pizza] # comments on arrays do not
@@ -58,7 +87,7 @@ yq -o=props '... comments = ""' sample.yml
 ```
 will output
 ```properties
-person.name = Mike
+person.name = Mike Wazowski
 person.pets.0 = cat
 person.food.0 = pizza
 ```
@@ -70,7 +99,7 @@ Given a sample.yml file of:
 ```yaml
 # block comments don't come through
 person: # neither do comments on maps
-    name: Mike # comments on values appear
+    name: Mike Wazowski # comments on values appear
     pets: 
     - cat # comments on array values appear
     food: [pizza] # comments on arrays do not
@@ -85,7 +114,7 @@ yq -o=props '(.. | select( (tag == "!!map" or tag =="!!seq") and length == 0)) =
 will output
 ```properties
 # comments on values appear
-person.name = Mike
+person.name = Mike Wazowski
 
 # comments on array values appear
 person.pets.0 = cat
@@ -98,7 +127,7 @@ emptyMap =
 Given a sample.properties file of:
 ```properties
 # comments on values appear
-person.name = Mike
+person.name = Mike Wazowski
 
 # comments on array values appear
 person.pets.0 = cat
@@ -112,7 +141,7 @@ yq -p=props sample.properties
 will output
 ```yaml
 person:
-    name: Mike # comments on values appear
+    name: Mike Wazowski # comments on values appear
     pets:
         - cat # comments on array values appear
     food:
@@ -123,7 +152,7 @@ person:
 Given a sample.properties file of:
 ```properties
 # comments on values appear
-person.name = Mike
+person.name = Mike Wazowski
 
 # comments on array values appear
 person.pets.0 = cat
@@ -137,7 +166,7 @@ yq -p=props -o=props '.person.pets.0 = "dog"' sample.properties
 will output
 ```properties
 # comments on values appear
-person.name = Mike
+person.name = Mike Wazowski
 
 # comments on array values appear
 person.pets.0 = dog

pkg/yqlib/doc/usage/xml.md

@@ -120,6 +120,31 @@ cat:
   +legs: "4"
 ```
 
+## Parse xml: custom dtd
+DTD entities are ignored.
+
+Given a sample.xml file of:
+```xml
+
+<?xml version="1.0"?>
+<!DOCTYPE root [
+<!ENTITY writer "Blah.">
+<!ENTITY copyright "Blah">
+]>
+<root>
+    <item>&writer;&copyright;</item>
+</root>
+```
+then
+```bash
+yq -p=xml '.' sample.xml
+```
+will output
+```yaml
+root:
+  item: '&writer;&copyright;'
+```
+
 ## Parse xml: with comments
 A best attempt is made to preserve comments.
 
@@ -167,6 +192,52 @@ cat:
 # after cat
 ```
 
+## Parse xml: keep attribute namespace
+Given a sample.xml file of:
+```xml
+
+<?xml version="1.0"?>
+<map xmlns="some-namespace" xmlns:xsi="some-instance" xsi:schemaLocation="some-url">
+</map>
+
+```
+then
+```bash
+yq -p=xml -o=xml --xml-keep-namespace '.' sample.xml
+```
+will output
+```xml
+<map xmlns="some-namespace" xmlns:xsi="some-instance" some-instance:schemaLocation="some-url"></map>
+```
+
+instead of
+```xml
+<map xmlns="some-namespace" xsi="some-instance" schemaLocation="some-url"></map>
+```
+
+## Parse xml: keep raw attribute namespace
+Given a sample.xml file of:
+```xml
+
+<?xml version="1.0"?>
+<map xmlns="some-namespace" xmlns:xsi="some-instance" xsi:schemaLocation="some-url">
+</map>
+
+```
+then
+```bash
+yq -p=xml -o=xml --xml-keep-namespace --xml-raw-token '.' sample.xml
+```
+will output
+```xml
+<map xmlns="some-namespace" xmlns:xsi="some-instance" xsi:schemaLocation="some-url"></map>
+```
+
+instead of
+```xml
+<map xmlns="some-namespace" xsi="some-instance" schemaLocation="some-url"></map>
+```
+
 ## Encode xml: simple
 Given a sample.yml file of:
 ```yaml

pkg/yqlib/encoder_csv.go

@@ -13,7 +13,7 @@ type csvEncoder struct {
 }
 
 func NewCsvEncoder(separator rune) Encoder {
-	return &csvEncoder{separator}
+	return &csvEncoder{separator: separator}
 }
 
 func (e *csvEncoder) CanHandleAliases() bool {
@@ -41,6 +41,67 @@ func (e *csvEncoder) encodeRow(csvWriter *csv.Writer, contents []*yaml.Node) err
 	return csvWriter.Write(stringValues)
 }
 
+func (e *csvEncoder) encodeArrays(csvWriter *csv.Writer, content []*yaml.Node) error {
+	for i, child := range content {
+
+		if child.Kind != yaml.SequenceNode {
+			return fmt.Errorf("csv encoding only works for arrays of scalars (string/numbers/booleans), child[%v] is a %v", i, child.Tag)
+		}
+		err := e.encodeRow(csvWriter, child.Content)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (e *csvEncoder) extractHeader(child *yaml.Node) ([]*yaml.Node, error) {
+	if child.Kind != yaml.MappingNode {
+		return nil, fmt.Errorf("csv object encoding only works for arrays of flat objects (string key => string/numbers/boolean value), child[0] is a %v", child.Tag)
+	}
+	mapKeys := getMapKeys(child)
+	return mapKeys.Content, nil
+}
+
+func (e *csvEncoder) createChildRow(child *yaml.Node, headers []*yaml.Node) []*yaml.Node {
+	childRow := make([]*yaml.Node, 0)
+	for _, header := range headers {
+		keyIndex := findKeyInMap(child, header)
+		value := createScalarNode(nil, "")
+		if keyIndex != -1 {
+			value = child.Content[keyIndex+1]
+		}
+		childRow = append(childRow, value)
+	}
+	return childRow
+
+}
+
+func (e *csvEncoder) encodeObjects(csvWriter *csv.Writer, content []*yaml.Node) error {
+	headers, err := e.extractHeader(content[0])
+	if err != nil {
+		return nil
+	}
+
+	err = e.encodeRow(csvWriter, headers)
+	if err != nil {
+		return nil
+	}
+
+	for i, child := range content {
+		if child.Kind != yaml.MappingNode {
+			return fmt.Errorf("csv object encoding only works for arrays of flat objects (string key => string/numbers/boolean value), child[%v] is a %v", i, child.Tag)
+		}
+		row := e.createChildRow(child, headers)
+		err = e.encodeRow(csvWriter, row)
+		if err != nil {
+			return err
+		}
+
+	}
+	return nil
+}
+
 func (e *csvEncoder) Encode(writer io.Writer, originalNode *yaml.Node) error {
 	csvWriter := csv.NewWriter(writer)
 	csvWriter.Comma = e.separator
@@ -56,15 +117,10 @@ func (e *csvEncoder) Encode(writer io.Writer, originalNode *yaml.Node) error {
 		return e.encodeRow(csvWriter, node.Content)
 	}
 
-	for i, child := range node.Content {
-
-		if child.Kind != yaml.SequenceNode {
-			return fmt.Errorf("csv encoding only works for arrays of scalars (string/numbers/booleans), child[%v] is a %v", i, child.Tag)
-		}
-		err := e.encodeRow(csvWriter, child.Content)
-		if err != nil {
-			return err
-		}
+	if node.Content[0].Kind == yaml.MappingNode {
+		return e.encodeObjects(csvWriter, node.Content)
 	}
-	return nil
+
+	return e.encodeArrays(csvWriter, node.Content)
+
 }

pkg/yqlib/encoder_csv_test.go

@@ -1,60 +0,0 @@
-package yqlib
-
-import (
-	"bufio"
-	"bytes"
-	"strings"
-	"testing"
-
-	"github.com/mikefarah/yq/v4/test"
-)
-
-func yamlToCsv(sampleYaml string, separator rune) string {
-	var output bytes.Buffer
-	writer := bufio.NewWriter(&output)
-
-	var jsonEncoder = NewCsvEncoder(separator)
-	inputs, err := readDocuments(strings.NewReader(sampleYaml), "sample.yml", 0, NewYamlDecoder())
-	if err != nil {
-		panic(err)
-	}
-	node := inputs.Front().Value.(*CandidateNode).Node
-	err = jsonEncoder.Encode(writer, node)
-	if err != nil {
-		panic(err)
-	}
-	writer.Flush()
-
-	return strings.TrimSuffix(output.String(), "\n")
-}
-
-var sampleYaml = `["apple", apple2, "comma, in, value", "new
-line", 3, 3.40, true, "tab	here"]`
-
-var sampleYamlArray = "[" + sampleYaml + ", [bob, cat, meow, puss]]"
-
-func TestCsvEncoderEmptyArray(t *testing.T) {
-	var actualCsv = yamlToCsv(`[]`, ',')
-	test.AssertResult(t, "", actualCsv)
-}
-
-func TestCsvEncoder(t *testing.T) {
-	var expectedCsv = `apple,apple2,"comma, in, value",new line,3,3.40,true,tab	here`
-
-	var actualCsv = yamlToCsv(sampleYaml, ',')
-	test.AssertResult(t, expectedCsv, actualCsv)
-}
-
-func TestCsvEncoderArrayOfArrays(t *testing.T) {
-	var actualCsv = yamlToCsv(sampleYamlArray, ',')
-	var expectedCsv = "apple,apple2,\"comma, in, value\",new line,3,3.40,true,tab	here\nbob,cat,meow,puss"
-	test.AssertResult(t, expectedCsv, actualCsv)
-}
-
-func TestTsvEncoder(t *testing.T) {
-
-	var expectedCsv = `apple	apple2	comma, in, value	new line	3	3.40	true	"tab	here"`
-
-	var actualCsv = yamlToCsv(sampleYaml, '\t')
-	test.AssertResult(t, expectedCsv, actualCsv)
-}

pkg/yqlib/encoder_json.go

@@ -1,14 +1,16 @@
 package yqlib
 
 import (
-	"encoding/json"
+	"bytes"
 	"io"
 
+	"github.com/goccy/go-json"
 	yaml "gopkg.in/yaml.v3"
 )
 
 type jsonEncoder struct {
 	indentString string
+	colorise     bool
 }
 
 func mapKeysToStrings(node *yaml.Node) {
@@ -26,14 +28,14 @@ func mapKeysToStrings(node *yaml.Node) {
 	}
 }
 
-func NewJONEncoder(indent int) Encoder {
+func NewJSONEncoder(indent int, colorise bool) Encoder {
 	var indentString = ""
 
 	for index := 0; index < indent; index++ {
 		indentString = indentString + " "
 	}
 
-	return &jsonEncoder{indentString}
+	return &jsonEncoder{indentString, colorise}
 }
 
 func (je *jsonEncoder) CanHandleAliases() bool {
@@ -49,7 +51,14 @@ func (je *jsonEncoder) PrintLeadingContent(writer io.Writer, content string) err
 }
 
 func (je *jsonEncoder) Encode(writer io.Writer, node *yaml.Node) error {
-	var encoder = json.NewEncoder(writer)
+
+	destination := writer
+	tempBuffer := bytes.NewBuffer(nil)
+	if je.colorise {
+		destination = tempBuffer
+	}
+
+	var encoder = json.NewEncoder(destination)
 	encoder.SetEscapeHTML(false) // do not escape html chars e.g. &, <, >
 	encoder.SetIndent("", je.indentString)
 
@@ -60,5 +69,12 @@ func (je *jsonEncoder) Encode(writer io.Writer, node *yaml.Node) error {
 	if errorDecoding != nil {
 		return errorDecoding
 	}
-	return encoder.Encode(dataBucket)
+	err := encoder.Encode(dataBucket)
+	if err != nil {
+		return err
+	}
+	if je.colorise {
+		return colorizeAndPrint(tempBuffer.Bytes(), writer)
+	}
+	return nil
 }

pkg/yqlib/encoder_properties.go

@@ -12,10 +12,13 @@ import (
 )
 
 type propertiesEncoder struct {
+	unwrapScalar bool
 }
 
-func NewPropertiesEncoder() Encoder {
-	return &propertiesEncoder{}
+func NewPropertiesEncoder(unwrapScalar bool) Encoder {
+	return &propertiesEncoder{
+		unwrapScalar: unwrapScalar,
+	}
 }
 
 func (pe *propertiesEncoder) CanHandleAliases() bool {
@@ -75,7 +78,13 @@ func (pe *propertiesEncoder) doEncode(p *properties.Properties, node *yaml.Node,
 	p.SetComment(path, headAndLineComment(node))
 	switch node.Kind {
 	case yaml.ScalarNode:
-		_, _, err := p.Set(path, node.Value)
+		var nodeValue string
+		if pe.unwrapScalar || !strings.Contains(node.Value, " ") {
+			nodeValue = node.Value
+		} else {
+			nodeValue = fmt.Sprintf("%q", node.Value)
+		}
+		_, _, err := p.Set(path, nodeValue)
 		return err
 	case yaml.DocumentNode:
 		return pe.doEncode(p, node.Content[0], path)

pkg/yqlib/encoder_properties_test.go

@@ -9,11 +9,11 @@ import (
 	"github.com/mikefarah/yq/v4/test"
 )
 
-func yamlToProps(sampleYaml string) string {
+func yamlToProps(sampleYaml string, unwrapScalar bool) string {
 	var output bytes.Buffer
 	writer := bufio.NewWriter(&output)
 
-	var propsEncoder = NewPropertiesEncoder()
+	var propsEncoder = NewPropertiesEncoder(unwrapScalar)
 	inputs, err := readDocuments(strings.NewReader(sampleYaml), "sample.yml", 0, NewYamlDecoder())
 	if err != nil {
 		panic(err)
@@ -28,51 +28,100 @@ func yamlToProps(sampleYaml string) string {
 	return strings.TrimSuffix(output.String(), "\n")
 }
 
-func TestPropertiesEncoderSimple(t *testing.T) {
+func TestPropertiesEncoderSimple_Unwrapped(t *testing.T) {
 	var sampleYaml = `a: 'bob cool'`
 
 	var expectedProps = `a = bob cool`
-	var actualProps = yamlToProps(sampleYaml)
+	var actualProps = yamlToProps(sampleYaml, true)
 	test.AssertResult(t, expectedProps, actualProps)
 }
 
-func TestPropertiesEncoderSimpleWithComments(t *testing.T) {
+func TestPropertiesEncoderSimple_Wrapped(t *testing.T) {
+	var sampleYaml = `a: 'bob cool'`
+
+	var expectedProps = `a = "bob cool"`
+	var actualProps = yamlToProps(sampleYaml, false)
+	test.AssertResult(t, expectedProps, actualProps)
+}
+
+func TestPropertiesEncoderSimpleWithComments_Unwrapped(t *testing.T) {
 	var sampleYaml = `a: 'bob cool' # line`
 
 	var expectedProps = `# line
 a = bob cool`
-	var actualProps = yamlToProps(sampleYaml)
+	var actualProps = yamlToProps(sampleYaml, true)
 	test.AssertResult(t, expectedProps, actualProps)
 }
 
-func TestPropertiesEncoderDeep(t *testing.T) {
+func TestPropertiesEncoderSimpleWithComments_Wrapped(t *testing.T) {
+	var sampleYaml = `a: 'bob cool' # line`
+
+	var expectedProps = `# line
+a = "bob cool"`
+	var actualProps = yamlToProps(sampleYaml, false)
+	test.AssertResult(t, expectedProps, actualProps)
+}
+
+func TestPropertiesEncoderDeep_Unwrapped(t *testing.T) {
 	var sampleYaml = `a: 
   b: "bob cool"
 `
 
 	var expectedProps = `a.b = bob cool`
-	var actualProps = yamlToProps(sampleYaml)
+	var actualProps = yamlToProps(sampleYaml, true)
 	test.AssertResult(t, expectedProps, actualProps)
 }
 
-func TestPropertiesEncoderDeepWithComments(t *testing.T) {
+func TestPropertiesEncoderDeep_Wrapped(t *testing.T) {
+	var sampleYaml = `a: 
+  b: "bob cool"
+`
+
+	var expectedProps = `a.b = "bob cool"`
+	var actualProps = yamlToProps(sampleYaml, false)
+	test.AssertResult(t, expectedProps, actualProps)
+}
+
+func TestPropertiesEncoderDeepWithComments_Unwrapped(t *testing.T) {
 	var sampleYaml = `a:  # a thing
   b: "bob cool" # b thing
 `
 
 	var expectedProps = `# b thing
 a.b = bob cool`
-	var actualProps = yamlToProps(sampleYaml)
+	var actualProps = yamlToProps(sampleYaml, true)
 	test.AssertResult(t, expectedProps, actualProps)
 }
 
-func TestPropertiesEncoderArray(t *testing.T) {
+func TestPropertiesEncoderDeepWithComments_Wrapped(t *testing.T) {
+	var sampleYaml = `a:  # a thing
+  b: "bob cool" # b thing
+`
+
+	var expectedProps = `# b thing
+a.b = "bob cool"`
+	var actualProps = yamlToProps(sampleYaml, false)
+	test.AssertResult(t, expectedProps, actualProps)
+}
+
+func TestPropertiesEncoderArray_Unwrapped(t *testing.T) {
 	var sampleYaml = `a: 
   b: [{c: dog}, {c: cat}]
 `
 
 	var expectedProps = `a.b.0.c = dog
 a.b.1.c = cat`
-	var actualProps = yamlToProps(sampleYaml)
+	var actualProps = yamlToProps(sampleYaml, true)
+	test.AssertResult(t, expectedProps, actualProps)
+}
+
+func TestPropertiesEncoderArray_Wrapped(t *testing.T) {
+	var sampleYaml = `a: 
+  b: [{c: dog named jim}, {c: cat named jam}]
+`
+
+	var expectedProps = `a.b.0.c = "dog named jim"
+a.b.1.c = "cat named jam"`
+	var actualProps = yamlToProps(sampleYaml, false)
 	test.AssertResult(t, expectedProps, actualProps)
 }

pkg/yqlib/encoder_test.go

@@ -13,7 +13,7 @@ func yamlToJSON(sampleYaml string, indent int) string {
 	var output bytes.Buffer
 	writer := bufio.NewWriter(&output)
 
-	var jsonEncoder = NewJONEncoder(indent)
+	var jsonEncoder = NewJSONEncoder(indent, false)
 	inputs, err := readDocuments(strings.NewReader(sampleYaml), "sample.yml", 0, NewYamlDecoder())
 	if err != nil {
 		panic(err)

pkg/yqlib/encoder_xml.go

@@ -9,7 +9,7 @@ import (
 	yaml "gopkg.in/yaml.v3"
 )
 
-var XMLPreferences = xmlPreferences{AttributePrefix: "+", ContentName: "+content"}
+var XMLPreferences = xmlPreferences{AttributePrefix: "+", ContentName: "+content", StrictMode: false, UseRawToken: false}
 
 type xmlEncoder struct {
 	attributePrefix string

pkg/yqlib/expression_parser.go

@@ -21,7 +21,7 @@ type expressionParserImpl struct {
 }
 
 func newExpressionParser() ExpressionParserInterface {
-	return &expressionParserImpl{newExpressionTokeniser(), newExpressionPostFixer()}
+	return &expressionParserImpl{newParticipleLexer(), newExpressionPostFixer()}
 }
 
 func (p *expressionParserImpl) ParseExpression(expression string) (*ExpressionNode, error) {

pkg/yqlib/expression_parser_test.go

@@ -7,9 +7,7 @@ import (
 )
 
 func getExpressionParser() ExpressionParserInterface {
-	if ExpressionParser == nil {
-		ExpressionParser = newExpressionParser()
-	}
+	InitExpressionParser()
 	return ExpressionParser
 }
 

pkg/yqlib/expression_postfix.go

@@ -50,7 +50,7 @@ func (p *expressionPostFixerImpl) ConvertToPostfix(infixTokens []*token) ([]*Ope
 			log.Debugf("put %v onto the opstack", currentToken.toString(true))
 		case closeCollect, closeCollectObject:
 			var opener tokenType = openCollect
-			var collectOperator *operationType = collectOpType
+			var collectOperator = collectOpType
 			if currentToken.TokenType == closeCollectObject {
 				opener = openCollectObject
 				collectOperator = collectObjectOpType
@@ -76,7 +76,7 @@ func (p *expressionPostFixerImpl) ConvertToPostfix(infixTokens []*token) ([]*Ope
 			// on the close op - move it to the traverse array op
 			// allows for .["cat"]?
 			prefs := traversePreferences{}
-			closeTokenMatch := string(currentToken.Match.Bytes)
+			closeTokenMatch := currentToken.Match
 			if closeTokenMatch[len(closeTokenMatch)-1:] == "?" {
 				prefs.OptionalTraverse = true
 			}

pkg/yqlib/expression_processing_test.go

@@ -15,6 +15,26 @@ var pathTests = []struct {
 	expectedTokens  []interface{}
 	expectedPostFix []interface{}
 }{
+	{
+		`envsubst(ne)`,
+		append(make([]interface{}, 0), "ENVSUBST_NO_EMPTY"),
+		append(make([]interface{}, 0), "ENVSUBST_NO_EMPTY"),
+	},
+	{
+		`envsubst(nu)`,
+		append(make([]interface{}, 0), "ENVSUBST_NO_UNSET"),
+		append(make([]interface{}, 0), "ENVSUBST_NO_UNSET"),
+	},
+	{
+		`envsubst(nu, ne)`,
+		append(make([]interface{}, 0), "ENVSUBST_NO_EMPTY_NO_UNSET"),
+		append(make([]interface{}, 0), "ENVSUBST_NO_EMPTY_NO_UNSET"),
+	},
+	{
+		`envsubst(ne, nu)`,
+		append(make([]interface{}, 0), "ENVSUBST_NO_EMPTY_NO_UNSET"),
+		append(make([]interface{}, 0), "ENVSUBST_NO_EMPTY_NO_UNSET"),
+	},
 	{
 		`[.a, .b]`,
 		append(make([]interface{}, 0), "[", "a", "UNION", "b", "]"),
@@ -292,7 +312,7 @@ var pathTests = []struct {
 	},
 }
 
-var tokeniser = newExpressionTokeniser()
+var tokeniser = newParticipleLexer()
 var postFixer = newExpressionPostFixer()
 
 func TestPathParsing(t *testing.T) {

pkg/yqlib/expression_tokeniser.go

@@ -1,642 +0,0 @@
-package yqlib
-
-import (
-	"fmt"
-	"regexp"
-	"strconv"
-	"strings"
-
-	lex "github.com/timtadh/lexmachine"
-	"github.com/timtadh/lexmachine/machines"
-)
-
-func skip(*lex.Scanner, *machines.Match) (interface{}, error) {
-	return nil, nil
-}
-
-type tokenType uint32
-
-const (
-	operationToken = 1 << iota
-	openBracket
-	closeBracket
-	openCollect
-	closeCollect
-	openCollectObject
-	closeCollectObject
-	traverseArrayCollect
-)
-
-type token struct {
-	TokenType            tokenType
-	Operation            *Operation
-	AssignOperation      *Operation      // e.g. tag (GetTag) op becomes AssignTag if '=' follows it
-	CheckForPostTraverse bool            // e.g. [1]cat should really be [1].cat
-	Match                *machines.Match // match that created this token
-
-}
-
-func (t *token) toString(detail bool) string {
-	if t.TokenType == operationToken {
-		if detail {
-			return fmt.Sprintf("%v (%v)", t.Operation.toString(), t.Operation.OperationType.Precedence)
-		}
-		return t.Operation.toString()
-	} else if t.TokenType == openBracket {
-		return "("
-	} else if t.TokenType == closeBracket {
-		return ")"
-	} else if t.TokenType == openCollect {
-		return "["
-	} else if t.TokenType == closeCollect {
-		return "]"
-	} else if t.TokenType == openCollectObject {
-		return "{"
-	} else if t.TokenType == closeCollectObject {
-		return "}"
-	} else if t.TokenType == traverseArrayCollect {
-		return ".["
-
-	} else {
-		return "NFI"
-	}
-}
-
-func pathToken(wrapped bool) lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		value := string(m.Bytes)
-		prefs := traversePreferences{}
-
-		if value[len(value)-1:] == "?" {
-			prefs.OptionalTraverse = true
-			value = value[:len(value)-1]
-		}
-
-		value = value[1:]
-		if wrapped {
-			value = unwrap(value)
-		}
-		log.Debug("PathToken %v", value)
-		op := &Operation{OperationType: traversePathOpType, Value: value, StringValue: value, Preferences: prefs}
-		return &token{TokenType: operationToken, Operation: op, CheckForPostTraverse: true}, nil
-	}
-}
-
-func opToken(op *operationType) lex.Action {
-	return opTokenWithPrefs(op, nil, nil)
-}
-
-func opAssignableToken(opType *operationType, assignOpType *operationType) lex.Action {
-	return opTokenWithPrefs(opType, assignOpType, nil)
-}
-
-func assignOpToken(updateAssign bool) lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		log.Debug("assignOpToken %v", string(m.Bytes))
-		value := string(m.Bytes)
-		prefs := assignPreferences{DontOverWriteAnchor: true}
-		op := &Operation{OperationType: assignOpType, Value: assignOpType.Type, StringValue: value, UpdateAssign: updateAssign, Preferences: prefs}
-		return &token{TokenType: operationToken, Operation: op}, nil
-	}
-}
-
-func multiplyWithPrefs(op *operationType) lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		prefs := multiplyPreferences{}
-		options := string(m.Bytes)
-		if strings.Contains(options, "+") {
-			prefs.AppendArrays = true
-		}
-		if strings.Contains(options, "?") {
-			prefs.TraversePrefs = traversePreferences{DontAutoCreate: true}
-		}
-		if strings.Contains(options, "n") {
-			prefs.AssignPrefs = assignPreferences{OnlyWriteNull: true}
-		}
-		if strings.Contains(options, "d") {
-			prefs.DeepMergeArrays = true
-		}
-		prefs.TraversePrefs.DontFollowAlias = true
-		op := &Operation{OperationType: op, Value: multiplyOpType.Type, StringValue: options, Preferences: prefs}
-		return &token{TokenType: operationToken, Operation: op}, nil
-	}
-}
-
-func opTokenWithPrefs(op *operationType, assignOpType *operationType, preferences interface{}) lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		log.Debug("opTokenWithPrefs %v", string(m.Bytes))
-		value := string(m.Bytes)
-		op := &Operation{OperationType: op, Value: op.Type, StringValue: value, Preferences: preferences}
-		var assign *Operation
-		if assignOpType != nil {
-			assign = &Operation{OperationType: assignOpType, Value: assignOpType.Type, StringValue: value, Preferences: preferences}
-		}
-		return &token{TokenType: operationToken, Operation: op, AssignOperation: assign}, nil
-	}
-}
-
-func extractNumberParamter(value string) (int, error) {
-	parameterParser := regexp.MustCompile(`.*\(([0-9]+)\)`)
-	matches := parameterParser.FindStringSubmatch(value)
-	var indent, errParsingInt = strconv.ParseInt(matches[1], 10, 32)
-	if errParsingInt != nil {
-		return 0, errParsingInt
-	}
-	return int(indent), nil
-}
-
-func flattenWithDepth() lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		value := string(m.Bytes)
-		var depth, errParsingInt = extractNumberParamter(value)
-		if errParsingInt != nil {
-			return nil, errParsingInt
-		}
-
-		prefs := flattenPreferences{depth: depth}
-		op := &Operation{OperationType: flattenOpType, Value: flattenOpType.Type, StringValue: value, Preferences: prefs}
-		return &token{TokenType: operationToken, Operation: op}, nil
-	}
-}
-
-func encodeWithIndent(outputFormat PrinterOutputFormat) lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		value := string(m.Bytes)
-		var indent, errParsingInt = extractNumberParamter(value)
-		if errParsingInt != nil {
-			return nil, errParsingInt
-		}
-
-		prefs := encoderPreferences{format: outputFormat, indent: indent}
-		op := &Operation{OperationType: encodeOpType, Value: encodeOpType.Type, StringValue: value, Preferences: prefs}
-		return &token{TokenType: operationToken, Operation: op}, nil
-	}
-}
-
-func assignAllCommentsOp(updateAssign bool) lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		log.Debug("assignAllCommentsOp %v", string(m.Bytes))
-		value := string(m.Bytes)
-		op := &Operation{
-			OperationType: assignCommentOpType,
-			Value:         assignCommentOpType.Type,
-			StringValue:   value,
-			UpdateAssign:  updateAssign,
-			Preferences:   commentOpPreferences{LineComment: true, HeadComment: true, FootComment: true},
-		}
-		return &token{TokenType: operationToken, Operation: op}, nil
-	}
-}
-
-func literalToken(pType tokenType, checkForPost bool) lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		return &token{TokenType: pType, CheckForPostTraverse: checkForPost, Match: m}, nil
-	}
-}
-
-func unwrap(value string) string {
-	return value[1 : len(value)-1]
-}
-
-func numberValue() lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		var numberString = string(m.Bytes)
-		var number, errParsingInt = strconv.ParseInt(numberString, 10, 64)
-		if errParsingInt != nil {
-			return nil, errParsingInt
-		}
-
-		return &token{TokenType: operationToken, Operation: createValueOperation(number, numberString)}, nil
-	}
-}
-
-func hexValue() lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		var originalString = string(m.Bytes)
-		var numberString = originalString[2:]
-		log.Debugf("numberString: %v", numberString)
-		var number, errParsingInt = strconv.ParseInt(numberString, 16, 64)
-		if errParsingInt != nil {
-			return nil, errParsingInt
-		}
-
-		return &token{TokenType: operationToken, Operation: createValueOperation(number, originalString)}, nil
-	}
-}
-
-func floatValue() lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		var numberString = string(m.Bytes)
-		var number, errParsingInt = strconv.ParseFloat(numberString, 64)
-		if errParsingInt != nil {
-			return nil, errParsingInt
-		}
-		return &token{TokenType: operationToken, Operation: createValueOperation(number, numberString)}, nil
-	}
-}
-
-func booleanValue(val bool) lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		return &token{TokenType: operationToken, Operation: createValueOperation(val, string(m.Bytes))}, nil
-	}
-}
-
-func stringValue(wrapped bool) lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		value := string(m.Bytes)
-		if wrapped {
-			value = unwrap(value)
-		}
-		value = strings.ReplaceAll(value, "\\\"", "\"")
-		return &token{TokenType: operationToken, Operation: createValueOperation(value, value)}, nil
-	}
-}
-
-func getVariableOpToken() lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		value := string(m.Bytes)
-
-		value = value[1:]
-
-		getVarOperation := createValueOperation(value, value)
-		getVarOperation.OperationType = getVariableOpType
-
-		return &token{TokenType: operationToken, Operation: getVarOperation, CheckForPostTraverse: true}, nil
-	}
-}
-
-func envOp(strenv bool) lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		value := string(m.Bytes)
-		preferences := envOpPreferences{}
-
-		if strenv {
-			// strenv( )
-			value = value[7 : len(value)-1]
-			preferences.StringValue = true
-		} else {
-			//env( )
-			value = value[4 : len(value)-1]
-		}
-
-		envOperation := createValueOperation(value, value)
-		envOperation.OperationType = envOpType
-		envOperation.Preferences = preferences
-
-		return &token{TokenType: operationToken, Operation: envOperation}, nil
-	}
-}
-
-func nullValue() lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		return &token{TokenType: operationToken, Operation: createValueOperation(nil, string(m.Bytes))}, nil
-	}
-}
-
-func selfToken() lex.Action {
-	return func(s *lex.Scanner, m *machines.Match) (interface{}, error) {
-		op := &Operation{OperationType: selfReferenceOpType}
-		return &token{TokenType: operationToken, Operation: op}, nil
-	}
-}
-
-func initLexer() (*lex.Lexer, error) {
-	lexer := lex.NewLexer()
-	lexer.Add([]byte(`\(`), literalToken(openBracket, false))
-	lexer.Add([]byte(`\)`), literalToken(closeBracket, true))
-
-	lexer.Add([]byte(`\.\[`), literalToken(traverseArrayCollect, false))
-	lexer.Add([]byte(`\.\.`), opTokenWithPrefs(recursiveDescentOpType, nil, recursiveDescentPreferences{RecurseArray: true,
-		TraversePreferences: traversePreferences{DontFollowAlias: true, IncludeMapKeys: false}}))
-
-	lexer.Add([]byte(`\.\.\.`), opTokenWithPrefs(recursiveDescentOpType, nil, recursiveDescentPreferences{RecurseArray: true,
-		TraversePreferences: traversePreferences{DontFollowAlias: true, IncludeMapKeys: true}}))
-
-	lexer.Add([]byte(`,`), opToken(unionOpType))
-	lexer.Add([]byte(`:\s*`), opToken(createMapOpType))
-	lexer.Add([]byte(`length`), opToken(lengthOpType))
-	lexer.Add([]byte(`line`), opToken(lineOpType))
-	lexer.Add([]byte(`column`), opToken(columnOpType))
-
-	lexer.Add([]byte(`eval`), opToken(evalOpType))
-
-	lexer.Add([]byte(`map`), opToken(mapOpType))
-	lexer.Add([]byte(`map_values`), opToken(mapValuesOpType))
-	lexer.Add([]byte(`pick`), opToken(pickOpType))
-
-	lexer.Add([]byte(`flatten\([0-9]+\)`), flattenWithDepth())
-	lexer.Add([]byte(`flatten`), opTokenWithPrefs(flattenOpType, nil, flattenPreferences{depth: -1}))
-
-	lexer.Add([]byte(`format_datetime`), opToken(formatDateTimeOpType))
-	lexer.Add([]byte(`now`), opToken(nowOpType))
-	lexer.Add([]byte(`tz`), opToken(tzOpType))
-	lexer.Add([]byte(`with_dtf`), opToken(withDtFormatOpType))
-
-	lexer.Add([]byte(`toyaml\([0-9]+\)`), encodeWithIndent(YamlOutputFormat))
-	lexer.Add([]byte(`to_yaml\([0-9]+\)`), encodeWithIndent(YamlOutputFormat))
-
-	lexer.Add([]byte(`toxml\([0-9]+\)`), encodeWithIndent(XMLOutputFormat))
-	lexer.Add([]byte(`to_xml\([0-9]+\)`), encodeWithIndent(XMLOutputFormat))
-
-	lexer.Add([]byte(`tojson\([0-9]+\)`), encodeWithIndent(JSONOutputFormat))
-	lexer.Add([]byte(`to_json\([0-9]+\)`), encodeWithIndent(JSONOutputFormat))
-
-	lexer.Add([]byte(`toyaml`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: YamlOutputFormat, indent: 2}))
-	lexer.Add([]byte(`to_yaml`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: YamlOutputFormat, indent: 2}))
-	// 0 indent doesn't work with yaml.
-	lexer.Add([]byte(`@yaml`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: YamlOutputFormat, indent: 2}))
-
-	lexer.Add([]byte(`tojson`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: JSONOutputFormat, indent: 2}))
-	lexer.Add([]byte(`to_json`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: JSONOutputFormat, indent: 2}))
-	lexer.Add([]byte(`@json`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: JSONOutputFormat, indent: 0}))
-
-	lexer.Add([]byte(`toprops`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: PropsOutputFormat, indent: 2}))
-	lexer.Add([]byte(`to_props`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: PropsOutputFormat, indent: 2}))
-	lexer.Add([]byte(`@props`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: PropsOutputFormat, indent: 2}))
-
-	lexer.Add([]byte(`tocsv`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: CSVOutputFormat}))
-	lexer.Add([]byte(`to_csv`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: CSVOutputFormat}))
-	lexer.Add([]byte(`@csv`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: CSVOutputFormat}))
-
-	lexer.Add([]byte(`totsv`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: TSVOutputFormat}))
-	lexer.Add([]byte(`to_tsv`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: TSVOutputFormat}))
-	lexer.Add([]byte(`@tsv`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: TSVOutputFormat}))
-
-	lexer.Add([]byte(`toxml`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: XMLOutputFormat}))
-	lexer.Add([]byte(`to_xml`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: XMLOutputFormat, indent: 2}))
-	lexer.Add([]byte(`@xml`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: XMLOutputFormat, indent: 0}))
-
-	lexer.Add([]byte(`@base64`), opTokenWithPrefs(encodeOpType, nil, encoderPreferences{format: Base64OutputFormat}))
-	lexer.Add([]byte(`@base64d`), opTokenWithPrefs(decodeOpType, nil, decoderPreferences{format: Base64InputFormat}))
-
-	lexer.Add([]byte(`fromyaml`), opTokenWithPrefs(decodeOpType, nil, decoderPreferences{format: YamlInputFormat}))
-	lexer.Add([]byte(`fromjson`), opTokenWithPrefs(decodeOpType, nil, decoderPreferences{format: YamlInputFormat}))
-	lexer.Add([]byte(`fromxml`), opTokenWithPrefs(decodeOpType, nil, decoderPreferences{format: XMLInputFormat}))
-
-	lexer.Add([]byte(`from_yaml`), opTokenWithPrefs(decodeOpType, nil, decoderPreferences{format: YamlInputFormat}))
-	lexer.Add([]byte(`from_json`), opTokenWithPrefs(decodeOpType, nil, decoderPreferences{format: YamlInputFormat}))
-	lexer.Add([]byte(`from_xml`), opTokenWithPrefs(decodeOpType, nil, decoderPreferences{format: XMLInputFormat}))
-
-	lexer.Add([]byte(`sortKeys`), opToken(sortKeysOpType))
-	lexer.Add([]byte(`sort_keys`), opToken(sortKeysOpType))
-
-	lexer.Add([]byte(`load`), opTokenWithPrefs(loadOpType, nil, loadPrefs{loadAsString: false, decoder: NewYamlDecoder()}))
-
-	lexer.Add([]byte(`xmlload`), opTokenWithPrefs(loadOpType, nil, loadPrefs{loadAsString: false, decoder: NewXMLDecoder(XMLPreferences.AttributePrefix, XMLPreferences.ContentName)}))
-	lexer.Add([]byte(`load_xml`), opTokenWithPrefs(loadOpType, nil, loadPrefs{loadAsString: false, decoder: NewXMLDecoder(XMLPreferences.AttributePrefix, XMLPreferences.ContentName)}))
-	lexer.Add([]byte(`loadxml`), opTokenWithPrefs(loadOpType, nil, loadPrefs{loadAsString: false, decoder: NewXMLDecoder(XMLPreferences.AttributePrefix, XMLPreferences.ContentName)}))
-
-	lexer.Add([]byte(`load_base64`), opTokenWithPrefs(loadOpType, nil, loadPrefs{loadAsString: false, decoder: NewBase64Decoder()}))
-
-	lexer.Add([]byte(`load_props`), opTokenWithPrefs(loadOpType, nil, loadPrefs{loadAsString: false, decoder: NewPropertiesDecoder()}))
-	lexer.Add([]byte(`loadprops`), opTokenWithPrefs(loadOpType, nil, loadPrefs{loadAsString: false, decoder: NewPropertiesDecoder()}))
-
-	lexer.Add([]byte(`strload`), opTokenWithPrefs(loadOpType, nil, loadPrefs{loadAsString: true}))
-	lexer.Add([]byte(`load_str`), opTokenWithPrefs(loadOpType, nil, loadPrefs{loadAsString: true}))
-	lexer.Add([]byte(`loadstr`), opTokenWithPrefs(loadOpType, nil, loadPrefs{loadAsString: true}))
-
-	lexer.Add([]byte(`select`), opToken(selectOpType))
-	lexer.Add([]byte(`has`), opToken(hasOpType))
-	lexer.Add([]byte(`unique`), opToken(uniqueOpType))
-	lexer.Add([]byte(`unique_by`), opToken(uniqueByOpType))
-	lexer.Add([]byte(`group_by`), opToken(groupByOpType))
-	lexer.Add([]byte(`explode`), opToken(explodeOpType))
-	lexer.Add([]byte(`or`), opToken(orOpType))
-	lexer.Add([]byte(`and`), opToken(andOpType))
-	lexer.Add([]byte(`not`), opToken(notOpType))
-	lexer.Add([]byte(`ireduce`), opToken(reduceOpType))
-	lexer.Add([]byte(`;`), opToken(blockOpType))
-	lexer.Add([]byte(`\/\/`), opToken(alternativeOpType))
-
-	lexer.Add([]byte(`documentIndex`), opToken(getDocumentIndexOpType))
-	lexer.Add([]byte(`document_index`), opToken(getDocumentIndexOpType))
-
-	lexer.Add([]byte(`di`), opToken(getDocumentIndexOpType))
-
-	lexer.Add([]byte(`splitDoc`), opToken(splitDocumentOpType))
-	lexer.Add([]byte(`split_doc`), opToken(splitDocumentOpType))
-
-	lexer.Add([]byte(`join`), opToken(joinStringOpType))
-	lexer.Add([]byte(`sub`), opToken(subStringOpType))
-	lexer.Add([]byte(`match`), opToken(matchOpType))
-	lexer.Add([]byte(`capture`), opToken(captureOpType))
-	lexer.Add([]byte(`test`), opToken(testOpType))
-
-	lexer.Add([]byte(`upcase`), opTokenWithPrefs(changeCaseOpType, nil, changeCasePrefs{ToUpperCase: true}))
-	lexer.Add([]byte(`ascii_upcase`), opTokenWithPrefs(changeCaseOpType, nil, changeCasePrefs{ToUpperCase: true}))
-
-	lexer.Add([]byte(`downcase`), opTokenWithPrefs(changeCaseOpType, nil, changeCasePrefs{ToUpperCase: false}))
-	lexer.Add([]byte(`ascii_downcase`), opTokenWithPrefs(changeCaseOpType, nil, changeCasePrefs{ToUpperCase: false}))
-
-	lexer.Add([]byte(`sort`), opToken(sortOpType))
-	lexer.Add([]byte(`sort_by`), opToken(sortByOpType))
-	lexer.Add([]byte(`reverse`), opToken(reverseOpType))
-
-	lexer.Add([]byte(`any`), opToken(anyOpType))
-	lexer.Add([]byte(`any_c`), opToken(anyConditionOpType))
-	lexer.Add([]byte(`all`), opToken(allOpType))
-	lexer.Add([]byte(`all_c`), opToken(allConditionOpType))
-	lexer.Add([]byte(`contains`), opToken(containsOpType))
-
-	lexer.Add([]byte(`split`), opToken(splitStringOpType))
-
-	lexer.Add([]byte(`parent`), opToken(getParentOpType))
-	lexer.Add([]byte(`key`), opToken(getKeyOpType))
-	lexer.Add([]byte(`keys`), opToken(keysOpType))
-
-	lexer.Add([]byte(`style`), opAssignableToken(getStyleOpType, assignStyleOpType))
-
-	lexer.Add([]byte(`tag`), opAssignableToken(getTagOpType, assignTagOpType))
-	lexer.Add([]byte(`anchor`), opAssignableToken(getAnchorOpType, assignAnchorOpType))
-	lexer.Add([]byte(`alias`), opAssignableToken(getAliasOptype, assignAliasOpType))
-	lexer.Add([]byte(`filename`), opToken(getFilenameOpType))
-
-	lexer.Add([]byte(`fileIndex`), opToken(getFileIndexOpType))
-	lexer.Add([]byte(`file_index`), opToken(getFileIndexOpType))
-
-	lexer.Add([]byte(`fi`), opToken(getFileIndexOpType))
-	lexer.Add([]byte(`path`), opToken(getPathOpType))
-	lexer.Add([]byte(`to_entries`), opToken(toEntriesOpType))
-	lexer.Add([]byte(`from_entries`), opToken(fromEntriesOpType))
-	lexer.Add([]byte(`with_entries`), opToken(withEntriesOpType))
-
-	lexer.Add([]byte(`with`), opToken(withOpType))
-
-	lexer.Add([]byte(`lineComment`), opTokenWithPrefs(getCommentOpType, assignCommentOpType, commentOpPreferences{LineComment: true}))
-	lexer.Add([]byte(`line_comment`), opTokenWithPrefs(getCommentOpType, assignCommentOpType, commentOpPreferences{LineComment: true}))
-
-	lexer.Add([]byte(`headComment`), opTokenWithPrefs(getCommentOpType, assignCommentOpType, commentOpPreferences{HeadComment: true}))
-	lexer.Add([]byte(`head_comment`), opTokenWithPrefs(getCommentOpType, assignCommentOpType, commentOpPreferences{HeadComment: true}))
-
-	lexer.Add([]byte(`footComment`), opTokenWithPrefs(getCommentOpType, assignCommentOpType, commentOpPreferences{FootComment: true}))
-	lexer.Add([]byte(`foot_comment`), opTokenWithPrefs(getCommentOpType, assignCommentOpType, commentOpPreferences{FootComment: true}))
-
-	lexer.Add([]byte(`comments\s*=`), assignAllCommentsOp(false))
-	lexer.Add([]byte(`comments\s*\|=`), assignAllCommentsOp(true))
-
-	lexer.Add([]byte(`collect`), opToken(collectOpType))
-
-	lexer.Add([]byte(`\s*==\s*`), opToken(equalsOpType))
-	lexer.Add([]byte(`\s*!=\s*`), opToken(notEqualsOpType))
-	lexer.Add([]byte(`\s*=\s*`), assignOpToken(false))
-
-	lexer.Add([]byte(`del`), opToken(deleteChildOpType))
-
-	lexer.Add([]byte(`\s*\|=\s*`), assignOpToken(true))
-
-	lexer.Add([]byte("( |\t|\n|\r)+"), skip)
-
-	lexer.Add([]byte(`\."[^ "]+"\??`), pathToken(true))
-	lexer.Add([]byte(`\.[^ ;\}\{\:\[\],\|\.\[\(\)=\n]+\??`), pathToken(false))
-	lexer.Add([]byte(`\.`), selfToken())
-
-	lexer.Add([]byte(`\|`), opToken(pipeOpType))
-
-	lexer.Add([]byte(`0[xX][0-9A-Fa-f]+`), hexValue())
-	lexer.Add([]byte(`-?\d+(\.\d+)`), floatValue())
-	lexer.Add([]byte(`-?[1-9](\.\d+)?[Ee][-+]?\d+`), floatValue())
-	lexer.Add([]byte(`-?\d+`), numberValue())
-
-	lexer.Add([]byte(`[Tt][Rr][Uu][Ee]`), booleanValue(true))
-	lexer.Add([]byte(`[Ff][Aa][Ll][Ss][Ee]`), booleanValue(false))
-
-	lexer.Add([]byte(`[Nn][Uu][Ll][Ll]`), nullValue())
-	lexer.Add([]byte(`~`), nullValue())
-
-	lexer.Add([]byte(`"([^"\\]*(\\.[^"\\]*)*)"`), stringValue(true))
-	lexer.Add([]byte(`strenv\([^\)]+\)`), envOp(true))
-	lexer.Add([]byte(`env\([^\)]+\)`), envOp(false))
-
-	lexer.Add([]byte(`envsubst`), opToken(envsubstOpType))
-
-	lexer.Add([]byte(`\[`), literalToken(openCollect, false))
-	lexer.Add([]byte(`\]\??`), literalToken(closeCollect, true))
-	lexer.Add([]byte(`\{`), literalToken(openCollectObject, false))
-	lexer.Add([]byte(`\}`), literalToken(closeCollectObject, true))
-	lexer.Add([]byte(`\*=[\+|\?dn]*`), multiplyWithPrefs(multiplyAssignOpType))
-	lexer.Add([]byte(`\*[\+|\?dn]*`), multiplyWithPrefs(multiplyOpType))
-
-	lexer.Add([]byte(`\+`), opToken(addOpType))
-	lexer.Add([]byte(`\+=`), opToken(addAssignOpType))
-
-	lexer.Add([]byte(`\-`), opToken(subtractOpType))
-	lexer.Add([]byte(`\-=`), opToken(subtractAssignOpType))
-	lexer.Add([]byte(`\$[a-zA-Z_-0-9]+`), getVariableOpToken())
-	lexer.Add([]byte(`as`), opTokenWithPrefs(assignVariableOpType, nil, assignVarPreferences{}))
-	lexer.Add([]byte(`ref`), opTokenWithPrefs(assignVariableOpType, nil, assignVarPreferences{IsReference: true}))
-
-	err := lexer.CompileNFA()
-	if err != nil {
-		return nil, err
-	}
-	return lexer, nil
-}
-
-type expressionTokeniser interface {
-	Tokenise(expression string) ([]*token, error)
-}
-
-type expressionTokeniserImpl struct {
-	lexer *lex.Lexer
-}
-
-func newExpressionTokeniser() expressionTokeniser {
-	var lexer, err = initLexer()
-	if err != nil {
-		panic(err)
-	}
-	return &expressionTokeniserImpl{lexer}
-}
-
-func (p *expressionTokeniserImpl) Tokenise(expression string) ([]*token, error) {
-	scanner, err := p.lexer.Scanner([]byte(expression))
-
-	if err != nil {
-		return nil, fmt.Errorf("parsing expression: %w", err)
-	}
-	var tokens []*token
-	for tok, err, eof := scanner.Next(); !eof; tok, err, eof = scanner.Next() {
-
-		if tok != nil {
-			currentToken := tok.(*token)
-			log.Debugf("Tokenising %v", currentToken.toString(true))
-			tokens = append(tokens, currentToken)
-		}
-		if err != nil {
-			return nil, fmt.Errorf("parsing expression: %w", err)
-		}
-	}
-	var postProcessedTokens = make([]*token, 0)
-
-	skipNextToken := false
-
-	for index := range tokens {
-		if skipNextToken {
-			skipNextToken = false
-		} else {
-			postProcessedTokens, skipNextToken = p.handleToken(tokens, index, postProcessedTokens)
-		}
-	}
-
-	return postProcessedTokens, nil
-}
-
-func (p *expressionTokeniserImpl) handleToken(tokens []*token, index int, postProcessedTokens []*token) (tokensAccum []*token, skipNextToken bool) {
-	skipNextToken = false
-	currentToken := tokens[index]
-
-	log.Debug("processing %v", currentToken.toString(true))
-
-	if currentToken.TokenType == traverseArrayCollect {
-		// `.[exp]`` works by creating a traversal array of [self, exp] and piping that into the traverse array operator
-		//need to put a traverse array then a collect currentToken
-		// do this by adding traverse then converting currentToken to collect
-
-		log.Debug("  adding self")
-		op := &Operation{OperationType: selfReferenceOpType, StringValue: "SELF"}
-		postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: op})
-
-		log.Debug("  adding traverse array")
-		op = &Operation{OperationType: traverseArrayOpType, StringValue: "TRAVERSE_ARRAY"}
-		postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: op})
-
-		currentToken = &token{TokenType: openCollect}
-
-	}
-
-	if index != len(tokens)-1 && currentToken.AssignOperation != nil &&
-		tokens[index+1].TokenType == operationToken &&
-		tokens[index+1].Operation.OperationType == assignOpType {
-		log.Debug("  its an update assign")
-		currentToken.Operation = currentToken.AssignOperation
-		currentToken.Operation.UpdateAssign = tokens[index+1].Operation.UpdateAssign
-		skipNextToken = true
-	}
-
-	log.Debug("  adding token to the fixed list")
-	postProcessedTokens = append(postProcessedTokens, currentToken)
-
-	if index != len(tokens)-1 &&
-		((currentToken.TokenType == openCollect && tokens[index+1].TokenType == closeCollect) ||
-			(currentToken.TokenType == openCollectObject && tokens[index+1].TokenType == closeCollectObject)) {
-		log.Debug("  adding empty")
-		op := &Operation{OperationType: emptyOpType, StringValue: "EMPTY"}
-		postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: op})
-	}
-
-	if index != len(tokens)-1 && currentToken.CheckForPostTraverse &&
-		((tokens[index+1].TokenType == operationToken && (tokens[index+1].Operation.OperationType == traversePathOpType)) ||
-			(tokens[index+1].TokenType == traverseArrayCollect)) {
-		log.Debug("  adding pipe because the next thing is traverse")
-		op := &Operation{OperationType: shortPipeOpType, Value: "PIPE", StringValue: "."}
-		postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: op})
-	}
-	if index != len(tokens)-1 && currentToken.CheckForPostTraverse &&
-		tokens[index+1].TokenType == openCollect {
-
-		log.Debug("  adding traverArray because next is opencollect")
-		op := &Operation{OperationType: traverseArrayOpType}
-		postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: op})
-	}
-	return postProcessedTokens, skipNextToken
-}

pkg/yqlib/file_utils.go

@@ -39,7 +39,7 @@ func copyFileContents(src, dst string) (err error) {
 		return err
 	}
 	defer safelyCloseFile(in)
-	out, err := os.Create(dst)
+	out, err := os.Create(dst) // #nosec
 	if err != nil {
 		return err
 	}

pkg/yqlib/json_test.go

@@ -9,7 +9,7 @@ import (
 	"github.com/mikefarah/yq/v4/test"
 )
 
-var complexExpectYaml = `D0, P[], (!!map)::a: Easy! as one two three
+const complexExpectYaml = `D0, P[], (!!map)::a: Easy! as one two three
 b:
     c: 2
     d:
@@ -17,6 +17,59 @@ b:
         - 4
 `
 
+const sampleNdJson = `{"this": "is a multidoc json file"}
+{"each": ["line is a valid json document"]}
+{"a number": 4}
+`
+
+const expectedNdJsonYaml = `this: is a multidoc json file
+---
+each:
+  - line is a valid json document
+---
+a number: 4
+`
+
+const expectedRoundTripSampleNdJson = `{"this":"is a multidoc json file"}
+{"each":["line is a valid json document"]}
+{"a number":4}
+`
+
+const expectedUpdatedMultilineJson = `{"this":"is a multidoc json file"}
+{"each":["line is a valid json document","cool"]}
+{"a number":4}
+`
+
+const sampleMultiLineJson = `{
+	"this": "is a multidoc json file"
+}
+{
+	"it": [
+		"has",
+		"consecutive",
+		"json documents"
+	]
+}
+{
+	"a number": 4
+}
+`
+
+const roundTripMultiLineJson = `{
+  "this": "is a multidoc json file"
+}
+{
+  "it": [
+    "has",
+    "consecutive",
+    "json documents"
+  ]
+}
+{
+  "a number": 4
+}
+`
+
 var jsonScenarios = []formatScenario{
 	{
 		description:    "Parse json: simple",
@@ -68,6 +121,120 @@ var jsonScenarios = []formatScenario{
 		expected:       "{\"stuff\":\"cool\"}\n{\"whatever\":\"cat\"}\n",
 		scenarioType:   "encode",
 	},
+	{
+		description:    "Roundtrip NDJSON",
+		subdescription: "Unfortunately the json encoder strips leading spaces of values.",
+		input:          sampleNdJson,
+		expected:       expectedRoundTripSampleNdJson,
+		scenarioType:   "roundtrip-ndjson",
+	},
+	{
+		description:    "Roundtrip multi-document JSON",
+		subdescription: "The NDJSON parser can also handle multiple multi-line json documents in a single file!",
+		input:          sampleMultiLineJson,
+		expected:       roundTripMultiLineJson,
+		scenarioType:   "roundtrip-multi",
+	},
+	{
+		description:    "Update a specific document in a multi-document json",
+		subdescription: "Documents are indexed by the `documentIndex` or `di` operator.",
+		input:          sampleNdJson,
+		expected:       expectedUpdatedMultilineJson,
+		expression:     `(select(di == 1) | .each ) += "cool"`,
+		scenarioType:   "roundtrip-ndjson",
+	},
+	{
+		description:    "Find and update a specific document in a multi-document json",
+		subdescription: "Use expressions as you normally would.",
+		input:          sampleNdJson,
+		expected:       expectedUpdatedMultilineJson,
+		expression:     `(select(has("each")) | .each ) += "cool"`,
+		scenarioType:   "roundtrip-ndjson",
+	},
+	{
+		description:  "Decode NDJSON",
+		input:        sampleNdJson,
+		expected:     expectedNdJsonYaml,
+		scenarioType: "decode-ndjson",
+	},
+	{
+		description:  "numbers",
+		skipDoc:      true,
+		input:        "[3, 3.0, 3.1, -1]",
+		expected:     "- 3\n- 3\n- 3.1\n- -1\n",
+		scenarioType: "decode-ndjson",
+	},
+	{
+		description:  "strings",
+		skipDoc:      true,
+		input:        `["", "cat"]`,
+		expected:     "- \"\"\n- cat\n",
+		scenarioType: "decode-ndjson",
+	},
+	{
+		description:  "null",
+		skipDoc:      true,
+		input:        `null`,
+		expected:     "null\n",
+		scenarioType: "decode-ndjson",
+	},
+	{
+		description:  "booleans",
+		skipDoc:      true,
+		input:        `[true, false]`,
+		expected:     "- true\n- false\n",
+		scenarioType: "decode-ndjson",
+	},
+}
+
+func documentRoundtripNdJsonScenario(w *bufio.Writer, s formatScenario, indent int) {
+	writeOrPanic(w, fmt.Sprintf("## %v\n", s.description))
+
+	if s.subdescription != "" {
+		writeOrPanic(w, s.subdescription)
+		writeOrPanic(w, "\n\n")
+	}
+
+	writeOrPanic(w, "Given a sample.json file of:\n")
+	writeOrPanic(w, fmt.Sprintf("```json\n%v\n```\n", s.input))
+
+	writeOrPanic(w, "then\n")
+
+	expression := s.expression
+	if expression != "" {
+		writeOrPanic(w, fmt.Sprintf("```bash\nyq -p=json -o=json -I=%v '%v' sample.json\n```\n", indent, expression))
+	} else {
+		writeOrPanic(w, fmt.Sprintf("```bash\nyq -p=json -o=json -I=%v sample.json\n```\n", indent))
+	}
+
+	writeOrPanic(w, "will output\n")
+
+	writeOrPanic(w, fmt.Sprintf("```yaml\n%v```\n\n", processFormatScenario(s, NewJSONDecoder(), NewJSONEncoder(indent, false))))
+}
+
+func documentDecodeNdJsonScenario(w *bufio.Writer, s formatScenario) {
+	writeOrPanic(w, fmt.Sprintf("## %v\n", s.description))
+
+	if s.subdescription != "" {
+		writeOrPanic(w, s.subdescription)
+		writeOrPanic(w, "\n\n")
+	}
+
+	writeOrPanic(w, "Given a sample.json file of:\n")
+	writeOrPanic(w, fmt.Sprintf("```json\n%v\n```\n", s.input))
+
+	writeOrPanic(w, "then\n")
+
+	expression := s.expression
+	if expression != "" {
+		writeOrPanic(w, fmt.Sprintf("```bash\nyq -p=json '%v' sample.json\n```\n", expression))
+	} else {
+		writeOrPanic(w, "```bash\nyq -p=json sample.json\n```\n")
+	}
+
+	writeOrPanic(w, "will output\n")
+
+	writeOrPanic(w, fmt.Sprintf("```yaml\n%v```\n\n", processFormatScenario(s, NewJSONDecoder(), NewYamlEncoder(s.indent, false, true, true))))
 }
 
 func decodeJSON(t *testing.T, jsonString string) *CandidateNode {
@@ -96,11 +263,21 @@ func decodeJSON(t *testing.T, jsonString string) *CandidateNode {
 }
 
 func testJSONScenario(t *testing.T, s formatScenario) {
-	if s.scenarioType == "encode" || s.scenarioType == "roundtrip" {
-		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewYamlDecoder(), NewJONEncoder(s.indent)), s.description)
-	} else {
+	switch s.scenarioType {
+	case "encode", "decode":
+		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewYamlDecoder(), NewJSONEncoder(s.indent, false)), s.description)
+	case "":
 		var actual = resultToString(t, decodeJSON(t, s.input))
 		test.AssertResultWithContext(t, s.expected, actual, s.description)
+	case "decode-ndjson":
+		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewJSONDecoder(), NewYamlEncoder(2, false, true, true)), s.description)
+	case "roundtrip-ndjson":
+		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewJSONDecoder(), NewJSONEncoder(0, false)), s.description)
+	case "roundtrip-multi":
+		test.AssertResultWithContext(t, s.expected, processFormatScenario(s, NewJSONDecoder(), NewJSONEncoder(2, false)), s.description)
+
+	default:
+		panic(fmt.Sprintf("unhandled scenario type %q", s.scenarioType))
 	}
 }
 
@@ -135,14 +312,23 @@ func documentJSONDecodeScenario(t *testing.T, w *bufio.Writer, s formatScenario)
 
 func documentJSONScenario(t *testing.T, w *bufio.Writer, i interface{}) {
 	s := i.(formatScenario)
-
 	if s.skipDoc {
 		return
 	}
-	if s.scenarioType == "encode" {
-		documentJSONEncodeScenario(w, s)
-	} else {
+	switch s.scenarioType {
+	case "":
 		documentJSONDecodeScenario(t, w, s)
+	case "encode":
+		documentJSONEncodeScenario(w, s)
+	case "decode-ndjson":
+		documentDecodeNdJsonScenario(w, s)
+	case "roundtrip-ndjson":
+		documentRoundtripNdJsonScenario(w, s, 0)
+	case "roundtrip-multi":
+		documentRoundtripNdJsonScenario(w, s, 2)
+
+	default:
+		panic(fmt.Sprintf("unhandled scenario type %q", s.scenarioType))
 	}
 }
 
@@ -171,7 +357,7 @@ func documentJSONEncodeScenario(w *bufio.Writer, s formatScenario) {
 	}
 	writeOrPanic(w, "will output\n")
 
-	writeOrPanic(w, fmt.Sprintf("```json\n%v```\n\n", processFormatScenario(s, NewYamlDecoder(), NewJONEncoder(s.indent))))
+	writeOrPanic(w, fmt.Sprintf("```json\n%v```\n\n", processFormatScenario(s, NewYamlDecoder(), NewJSONEncoder(s.indent, false))))
 }
 
 func TestJSONScenarios(t *testing.T) {

pkg/yqlib/lexer.go

@@ -0,0 +1,159 @@
+package yqlib
+
+import (
+	"fmt"
+	"regexp"
+	"strconv"
+)
+
+type expressionTokeniser interface {
+	Tokenise(expression string) ([]*token, error)
+}
+
+type tokenType uint32
+
+const (
+	operationToken = 1 << iota
+	openBracket
+	closeBracket
+	openCollect
+	closeCollect
+	openCollectObject
+	closeCollectObject
+	traverseArrayCollect
+)
+
+type token struct {
+	TokenType            tokenType
+	Operation            *Operation
+	AssignOperation      *Operation // e.g. tag (GetTag) op becomes AssignTag if '=' follows it
+	CheckForPostTraverse bool       // e.g. [1]cat should really be [1].cat
+	Match                string
+}
+
+func (t *token) toString(detail bool) string {
+	if t.TokenType == operationToken {
+		if detail {
+			return fmt.Sprintf("%v (%v)", t.Operation.toString(), t.Operation.OperationType.Precedence)
+		}
+		return t.Operation.toString()
+	} else if t.TokenType == openBracket {
+		return "("
+	} else if t.TokenType == closeBracket {
+		return ")"
+	} else if t.TokenType == openCollect {
+		return "["
+	} else if t.TokenType == closeCollect {
+		return "]"
+	} else if t.TokenType == openCollectObject {
+		return "{"
+	} else if t.TokenType == closeCollectObject {
+		return "}"
+	} else if t.TokenType == traverseArrayCollect {
+		return ".["
+
+	} else {
+		return "NFI"
+	}
+}
+
+func unwrap(value string) string {
+	return value[1 : len(value)-1]
+}
+
+func extractNumberParameter(value string) (int, error) {
+	parameterParser := regexp.MustCompile(`.*\(([0-9]+)\)`)
+	matches := parameterParser.FindStringSubmatch(value)
+	var indent, errParsingInt = strconv.ParseInt(matches[1], 10, 32)
+	if errParsingInt != nil {
+		return 0, errParsingInt
+	}
+	return int(indent), nil
+}
+
+func hasOptionParameter(value string, option string) bool {
+	parameterParser := regexp.MustCompile(`.*\([^\)]*\)`)
+	matches := parameterParser.FindStringSubmatch(value)
+	if len(matches) == 0 {
+		return false
+	}
+	parameterString := matches[0]
+	optionParser := regexp.MustCompile(fmt.Sprintf("\\b%v\\b", option))
+	return len(optionParser.FindStringSubmatch(parameterString)) > 0
+}
+
+func postProcessTokens(tokens []*token) []*token {
+	var postProcessedTokens = make([]*token, 0)
+
+	skipNextToken := false
+
+	for index := range tokens {
+		if skipNextToken {
+			skipNextToken = false
+		} else {
+			postProcessedTokens, skipNextToken = handleToken(tokens, index, postProcessedTokens)
+		}
+	}
+
+	return postProcessedTokens
+}
+
+func handleToken(tokens []*token, index int, postProcessedTokens []*token) (tokensAccum []*token, skipNextToken bool) {
+	skipNextToken = false
+	currentToken := tokens[index]
+
+	log.Debug("processing %v", currentToken.toString(true))
+
+	if currentToken.TokenType == traverseArrayCollect {
+		// `.[exp]`` works by creating a traversal array of [self, exp] and piping that into the traverse array operator
+		//need to put a traverse array then a collect currentToken
+		// do this by adding traverse then converting currentToken to collect
+
+		log.Debug("  adding self")
+		op := &Operation{OperationType: selfReferenceOpType, StringValue: "SELF"}
+		postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: op})
+
+		log.Debug("  adding traverse array")
+		op = &Operation{OperationType: traverseArrayOpType, StringValue: "TRAVERSE_ARRAY"}
+		postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: op})
+
+		currentToken = &token{TokenType: openCollect}
+
+	}
+
+	if index != len(tokens)-1 && currentToken.AssignOperation != nil &&
+		tokens[index+1].TokenType == operationToken &&
+		tokens[index+1].Operation.OperationType == assignOpType {
+		log.Debug("  its an update assign")
+		currentToken.Operation = currentToken.AssignOperation
+		currentToken.Operation.UpdateAssign = tokens[index+1].Operation.UpdateAssign
+		skipNextToken = true
+	}
+
+	log.Debug("  adding token to the fixed list")
+	postProcessedTokens = append(postProcessedTokens, currentToken)
+
+	if index != len(tokens)-1 &&
+		((currentToken.TokenType == openCollect && tokens[index+1].TokenType == closeCollect) ||
+			(currentToken.TokenType == openCollectObject && tokens[index+1].TokenType == closeCollectObject)) {
+		log.Debug("  adding empty")
+		op := &Operation{OperationType: emptyOpType, StringValue: "EMPTY"}
+		postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: op})
+	}
+
+	if index != len(tokens)-1 && currentToken.CheckForPostTraverse &&
+		((tokens[index+1].TokenType == operationToken && (tokens[index+1].Operation.OperationType == traversePathOpType)) ||
+			(tokens[index+1].TokenType == traverseArrayCollect)) {
+		log.Debug("  adding pipe because the next thing is traverse")
+		op := &Operation{OperationType: shortPipeOpType, Value: "PIPE", StringValue: "."}
+		postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: op})
+	}
+	if index != len(tokens)-1 && currentToken.CheckForPostTraverse &&
+		tokens[index+1].TokenType == openCollect {
+
+		log.Debug("  adding traverArray because next is opencollect")
+		op := &Operation{OperationType: traverseArrayOpType}
+		postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: op})
+	}
+	return postProcessedTokens, skipNextToken
+}

pkg/yqlib/lexer_participle.go

@@ -0,0 +1,533 @@
+package yqlib
+
+import (
+	"strconv"
+	"strings"
+
+	"github.com/alecthomas/participle/v2/lexer"
+)
+
+var participleYqRules = []*participleYqRule{
+	{"LINE_COMMENT", `line_?comment|lineComment`, opTokenWithPrefs(getCommentOpType, assignCommentOpType, commentOpPreferences{LineComment: true}), 0},
+	{"HEAD_COMMENT", `head_?comment|headComment`, opTokenWithPrefs(getCommentOpType, assignCommentOpType, commentOpPreferences{HeadComment: true}), 0},
+	{"FOOT_COMMENT", `foot_?comment|footComment`, opTokenWithPrefs(getCommentOpType, assignCommentOpType, commentOpPreferences{FootComment: true}), 0},
+
+	{"OpenBracket", `\(`, literalToken(openBracket, false), 0},
+	{"CloseBracket", `\)`, literalToken(closeBracket, true), 0},
+	{"OpenTraverseArrayCollect", `\.\[`, literalToken(traverseArrayCollect, false), 0},
+
+	{"OpenCollect", `\[`, literalToken(openCollect, false), 0},
+	{"CloseCollect", `\]\??`, literalToken(closeCollect, true), 0},
+
+	{"OpenCollectObject", `\{`, literalToken(openCollectObject, false), 0},
+	{"CloseCollectObject", `\}`, literalToken(closeCollectObject, true), 0},
+
+	{"RecursiveDecentIncludingKeys", `\.\.\.`, recursiveDecentOpToken(true), 0},
+	{"RecursiveDecent", `\.\.`, recursiveDecentOpToken(false), 0},
+
+	{"GetVariable", `\$[a-zA-Z_\-0-9]+`, getVariableOpToken(), 0},
+	{"AsignAsVariable", `as`, opTokenWithPrefs(assignVariableOpType, nil, assignVarPreferences{}), 0},
+	{"AsignRefVariable", `ref`, opTokenWithPrefs(assignVariableOpType, nil, assignVarPreferences{IsReference: true}), 0},
+
+	{"CreateMap", `:\s*`, opToken(createMapOpType), 0},
+	simpleOp("length", lengthOpType),
+	simpleOp("line", lineOpType),
+	simpleOp("column", columnOpType),
+	simpleOp("eval", evalOpType),
+
+	{"MapValues", `map_?values`, opToken(mapValuesOpType), 0},
+	simpleOp("map", mapOpType),
+	simpleOp("pick", pickOpType),
+
+	{"FlattenWithDepth", `flatten\([0-9]+\)`, flattenWithDepth(), 0},
+	{"Flatten", `flatten`, opTokenWithPrefs(flattenOpType, nil, flattenPreferences{depth: -1}), 0},
+
+	simpleOp("format_datetime", formatDateTimeOpType),
+	simpleOp("now", nowOpType),
+	simpleOp("tz", tzOpType),
+	simpleOp("with_dtf", withDtFormatOpType),
+	simpleOp("error", errorOpType),
+	simpleOp("sortKeys", sortKeysOpType),
+	simpleOp("sort_?keys", sortKeysOpType),
+
+	{"YamlEncodeWithIndent", `to_?yaml\([0-9]+\)`, encodeParseIndent(YamlOutputFormat), 0},
+	{"XMLEncodeWithIndent", `to_?xml\([0-9]+\)`, encodeParseIndent(XMLOutputFormat), 0},
+	{"JSONEncodeWithIndent", `to_?json\([0-9]+\)`, encodeParseIndent(JSONOutputFormat), 0},
+
+	{"YamlDecode", `from_?yaml|@yamld|from_?json|@jsond`, decodeOp(YamlInputFormat), 0},
+	{"YamlEncode", `to_?yaml|@yaml`, encodeWithIndent(YamlOutputFormat, 2), 0},
+
+	{"JSONEncode", `to_?json`, encodeWithIndent(JSONOutputFormat, 2), 0},
+	{"JSONEncodeNoIndent", `@json`, encodeWithIndent(JSONOutputFormat, 0), 0},
+
+	{"PropertiesDecode", `from_?props|@propsd`, decodeOp(PropertiesInputFormat), 0},
+	{"PropsEncode", `to_?props|@props`, encodeWithIndent(PropsOutputFormat, 2), 0},
+
+	{"XmlDecode", `from_?xml|@xmld`, decodeOp(XMLInputFormat), 0},
+	{"XMLEncode", `to_?xml`, encodeWithIndent(XMLOutputFormat, 2), 0},
+	{"XMLEncodeNoIndent", `@xml`, encodeWithIndent(XMLOutputFormat, 0), 0},
+
+	{"CSVDecode", `from_?csv|@csvd`, decodeOp(CSVObjectInputFormat), 0},
+	{"CSVEncode", `to_?csv|@csv`, encodeWithIndent(CSVOutputFormat, 0), 0},
+
+	{"TSVDecode", `from_?tsv|@tsvd`, decodeOp(TSVObjectInputFormat), 0},
+	{"TSVEncode", `to_?tsv|@tsv`, encodeWithIndent(TSVOutputFormat, 0), 0},
+
+	{"Base64d", `@base64d`, decodeOp(Base64InputFormat), 0},
+	{"Base64", `@base64`, encodeWithIndent(Base64OutputFormat, 0), 0},
+
+	{"LoadXML", `load_?xml|xml_?load`, loadOp(NewXMLDecoder(XMLPreferences.AttributePrefix, XMLPreferences.ContentName, XMLPreferences.StrictMode, XMLPreferences.KeepNamespace, XMLPreferences.UseRawToken), false), 0},
+
+	{"LoadBase64", `load_?base64`, loadOp(NewBase64Decoder(), false), 0},
+
+	{"LoadProperties", `load_?props`, loadOp(NewPropertiesDecoder(), false), 0},
+
+	{"LoadString", `load_?str|str_?load`, loadOp(nil, true), 0},
+
+	{"LoadYaml", `load`, loadOp(NewYamlDecoder(), false), 0},
+
+	{"SplitDocument", `splitDoc|split_?doc`, opToken(splitDocumentOpType), 0},
+
+	simpleOp("select", selectOpType),
+	simpleOp("has", hasOpType),
+	simpleOp("unique_?by", uniqueByOpType),
+	simpleOp("unique", uniqueOpType),
+
+	simpleOp("group_?by", groupByOpType),
+	simpleOp("explode", explodeOpType),
+	simpleOp("or", orOpType),
+	simpleOp("and", andOpType),
+	simpleOp("not", notOpType),
+	simpleOp("ireduce", reduceOpType),
+
+	simpleOp("join", joinStringOpType),
+	simpleOp("sub", subStringOpType),
+	simpleOp("match", matchOpType),
+	simpleOp("capture", captureOpType),
+	simpleOp("test", testOpType),
+
+	simpleOp("sort_?by", sortByOpType),
+	simpleOp("sort", sortOpType),
+
+	simpleOp("reverse", reverseOpType),
+
+	simpleOp("any_c", anyConditionOpType),
+	simpleOp("any", anyOpType),
+
+	simpleOp("all_c", allConditionOpType),
+	simpleOp("all", allOpType),
+
+	simpleOp("contains", containsOpType),
+	simpleOp("split", splitStringOpType),
+	simpleOp("parent", getParentOpType),
+
+	simpleOp("keys", keysOpType),
+	simpleOp("key", getKeyOpType),
+
+	simpleOp("file_?name|fileName", getFilenameOpType),
+	simpleOp("file_?index|fileIndex|fi", getFileIndexOpType),
+	simpleOp("path", getPathOpType),
+
+	simpleOp("to_?entries|toEntries", toEntriesOpType),
+	simpleOp("from_?entries|fromEntries", fromEntriesOpType),
+	simpleOp("with_?entries|withEntries", withEntriesOpType),
+
+	simpleOp("with", withOpType),
+
+	simpleOp("collect", collectOpType),
+	simpleOp("del", deleteChildOpType),
+
+	assignableOp("style", getStyleOpType, assignStyleOpType),
+	assignableOp("tag|type", getTagOpType, assignTagOpType),
+	assignableOp("anchor", getAnchorOpType, assignAnchorOpType),
+	assignableOp("alias", getAliasOpType, assignAliasOpType),
+
+	{"ALL_COMMENTS", `comments\s*=`, assignAllCommentsOp(false), 0},
+	{"ALL_COMMENTS_ASSIGN_RELATIVE", `comments\s*\|=`, assignAllCommentsOp(true), 0},
+
+	{"Block", `;`, opToken(blockOpType), 0},
+	{"Alternative", `\/\/`, opToken(alternativeOpType), 0},
+
+	{"DocumentIndex", `documentIndex|document_?index|di`, opToken(getDocumentIndexOpType), 0},
+
+	{"Uppercase", `upcase|ascii_?upcase`, opTokenWithPrefs(changeCaseOpType, nil, changeCasePrefs{ToUpperCase: true}), 0},
+	{"Downcase", `downcase|ascii_?downcase`, opTokenWithPrefs(changeCaseOpType, nil, changeCasePrefs{ToUpperCase: false}), 0},
+
+	{"HexValue", `0[xX][0-9A-Fa-f]+`, hexValue(), 0},
+	{"FloatValueScientific", `-?[1-9](\.\d+)?[Ee][-+]?\d+`, floatValue(), 0},
+	{"FloatValue", `-?\d+(\.\d+)`, floatValue(), 0},
+
+	{"NumberValue", `-?\d+`, numberValue(), 0},
+
+	{"TrueBooleanValue", `[Tt][Rr][Uu][Ee]`, booleanValue(true), 0},
+	{"FalseBooleanValue", `[Ff][Aa][Ll][Ss][Ee]`, booleanValue(false), 0},
+
+	{"NullValue", `[Nn][Uu][Ll][Ll]|~`, nullValue(), 0},
+
+	{"QuotedStringValue", `"([^"\\]*(\\.[^"\\]*)*)"`, stringValue(), 0},
+
+	{"StrEnvOp", `strenv\([^\)]+\)`, envOp(true), 0},
+	{"EnvOp", `env\([^\)]+\)`, envOp(false), 0},
+
+	{"EnvSubstWithOptions", `envsubst\((ne|nu|ff| |,)+\)`, envSubstWithOptions(), 0},
+	simpleOp("envsubst", envsubstOpType),
+
+	{"Equals", `\s*==\s*`, opToken(equalsOpType), 0},
+	{"NotEquals", `\s*!=\s*`, opToken(notEqualsOpType), 0},
+
+	{"GreaterThanEquals", `\s*>=\s*`, opTokenWithPrefs(compareOpType, nil, compareTypePref{OrEqual: true, Greater: true}), 0},
+	{"LessThanEquals", `\s*<=\s*`, opTokenWithPrefs(compareOpType, nil, compareTypePref{OrEqual: true, Greater: false}), 0},
+
+	{"GreaterThan", `\s*>\s*`, opTokenWithPrefs(compareOpType, nil, compareTypePref{OrEqual: false, Greater: true}), 0},
+	{"LessThan", `\s*<\s*`, opTokenWithPrefs(compareOpType, nil, compareTypePref{OrEqual: false, Greater: false}), 0},
+
+	{"AssignRelative", `\|=`, assignOpToken(true), 0},
+	{"Assign", `=`, assignOpToken(false), 0},
+
+	{`whitespace`, `[ \t\n]+`, nil, 0},
+
+	{"WrappedPathElement", `\."[^ "]+"\??`, pathToken(true), 0},
+	{"PathElement", `\.[^ ;\}\{\:\[\],\|\.\[\(\)=\n]+\??`, pathToken(false), 0},
+	{"Pipe", `\|`, opToken(pipeOpType), 0},
+	{"Self", `\.`, opToken(selfReferenceOpType), 0},
+
+	{"Union", `,`, opToken(unionOpType), 0},
+
+	{"MultiplyAssign", `\*=[\+|\?dn]*`, multiplyWithPrefs(multiplyAssignOpType), 0},
+	{"Multiply", `\*[\+|\?dn]*`, multiplyWithPrefs(multiplyOpType), 0},
+
+	{"AddAssign", `\+=`, opToken(addAssignOpType), 0},
+	{"Add", `\+`, opToken(addOpType), 0},
+
+	{"SubtractAssign", `\-=`, opToken(subtractAssignOpType), 0},
+	{"Subtract", `\-`, opToken(subtractOpType), 0},
+}
+
+type yqAction func(lexer.Token) (*token, error)
+
+type participleYqRule struct {
+	Name                string
+	Pattern             string
+	CreateYqToken       yqAction
+	ParticipleTokenType lexer.TokenType
+}
+
+type participleLexer struct {
+	lexerDefinition lexer.StringDefinition
+}
+
+func simpleOp(name string, opType *operationType) *participleYqRule {
+	return &participleYqRule{strings.ToUpper(string(name[1])) + name[1:], name, opToken(opType), 0}
+}
+
+func assignableOp(name string, opType *operationType, assignOpType *operationType) *participleYqRule {
+	return &participleYqRule{strings.ToUpper(string(name[1])) + name[1:], name, opTokenWithPrefs(opType, assignOpType, nil), 0}
+}
+
+func newParticipleLexer() expressionTokeniser {
+	simpleRules := make([]lexer.SimpleRule, len(participleYqRules))
+	for i, yqRule := range participleYqRules {
+		simpleRules[i] = lexer.SimpleRule{Name: yqRule.Name, Pattern: yqRule.Pattern}
+	}
+	lexerDefinition := lexer.MustSimple(simpleRules)
+	symbols := lexerDefinition.Symbols()
+
+	for _, yqRule := range participleYqRules {
+		yqRule.ParticipleTokenType = symbols[yqRule.Name]
+	}
+
+	return &participleLexer{lexerDefinition}
+}
+
+func pathToken(wrapped bool) yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		value := rawToken.Value
+		prefs := traversePreferences{}
+
+		if value[len(value)-1:] == "?" {
+			prefs.OptionalTraverse = true
+			value = value[:len(value)-1]
+		}
+
+		value = value[1:]
+		if wrapped {
+			value = unwrap(value)
+		}
+		log.Debug("PathToken %v", value)
+		op := &Operation{OperationType: traversePathOpType, Value: value, StringValue: value, Preferences: prefs}
+		return &token{TokenType: operationToken, Operation: op, CheckForPostTraverse: true}, nil
+	}
+}
+
+func recursiveDecentOpToken(includeMapKeys bool) yqAction {
+	prefs := recursiveDescentPreferences{
+		RecurseArray: true,
+		TraversePreferences: traversePreferences{
+			DontFollowAlias: true,
+			IncludeMapKeys:  includeMapKeys,
+		},
+	}
+	return opTokenWithPrefs(recursiveDescentOpType, nil, prefs)
+}
+
+func opTokenWithPrefs(opType *operationType, assignOpType *operationType, preferences interface{}) yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		value := rawToken.Value
+		op := &Operation{OperationType: opType, Value: opType.Type, StringValue: value, Preferences: preferences}
+		var assign *Operation
+		if assignOpType != nil {
+			assign = &Operation{OperationType: assignOpType, Value: assignOpType.Type, StringValue: value, Preferences: preferences}
+		}
+		return &token{TokenType: operationToken, Operation: op, AssignOperation: assign}, nil
+	}
+}
+
+func flattenWithDepth() yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		value := rawToken.Value
+		var depth, errParsingInt = extractNumberParameter(value)
+		if errParsingInt != nil {
+			return nil, errParsingInt
+		}
+
+		prefs := flattenPreferences{depth: depth}
+		op := &Operation{OperationType: flattenOpType, Value: flattenOpType.Type, StringValue: value, Preferences: prefs}
+		return &token{TokenType: operationToken, Operation: op}, nil
+	}
+}
+
+func assignAllCommentsOp(updateAssign bool) yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		log.Debug("assignAllCommentsOp %v", rawToken.Value)
+		value := rawToken.Value
+		op := &Operation{
+			OperationType: assignCommentOpType,
+			Value:         assignCommentOpType.Type,
+			StringValue:   value,
+			UpdateAssign:  updateAssign,
+			Preferences:   commentOpPreferences{LineComment: true, HeadComment: true, FootComment: true},
+		}
+		return &token{TokenType: operationToken, Operation: op}, nil
+	}
+}
+
+func assignOpToken(updateAssign bool) yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		log.Debug("assignOpToken %v", rawToken.Value)
+		value := rawToken.Value
+		prefs := assignPreferences{DontOverWriteAnchor: true}
+		op := &Operation{OperationType: assignOpType, Value: assignOpType.Type, StringValue: value, UpdateAssign: updateAssign, Preferences: prefs}
+		return &token{TokenType: operationToken, Operation: op}, nil
+	}
+}
+
+func booleanValue(val bool) yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		return &token{TokenType: operationToken, Operation: createValueOperation(val, rawToken.Value)}, nil
+	}
+}
+
+func nullValue() yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		return &token{TokenType: operationToken, Operation: createValueOperation(nil, rawToken.Value)}, nil
+	}
+}
+
+func stringValue() yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		value := unwrap(rawToken.Value)
+		value = strings.ReplaceAll(value, "\\\"", "\"")
+		return &token{TokenType: operationToken, Operation: createValueOperation(value, value)}, nil
+	}
+}
+
+func envOp(strenv bool) yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		value := rawToken.Value
+		preferences := envOpPreferences{}
+
+		if strenv {
+			// strenv( )
+			value = value[7 : len(value)-1]
+			preferences.StringValue = true
+		} else {
+			//env( )
+			value = value[4 : len(value)-1]
+		}
+
+		envOperation := createValueOperation(value, value)
+		envOperation.OperationType = envOpType
+		envOperation.Preferences = preferences
+
+		return &token{TokenType: operationToken, Operation: envOperation}, nil
+	}
+}
+
+func envSubstWithOptions() yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		value := rawToken.Value
+		noEmpty := hasOptionParameter(value, "ne")
+		noUnset := hasOptionParameter(value, "nu")
+		failFast := hasOptionParameter(value, "ff")
+		envsubstOpType.Type = "ENVSUBST"
+		prefs := envOpPreferences{NoUnset: noUnset, NoEmpty: noEmpty, FailFast: failFast}
+		if noEmpty {
+			envsubstOpType.Type = envsubstOpType.Type + "_NO_EMPTY"
+		}
+		if noUnset {
+			envsubstOpType.Type = envsubstOpType.Type + "_NO_UNSET"
+		}
+
+		op := &Operation{OperationType: envsubstOpType, Value: envsubstOpType.Type, StringValue: value, Preferences: prefs}
+		return &token{TokenType: operationToken, Operation: op}, nil
+	}
+}
+
+func multiplyWithPrefs(op *operationType) yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		prefs := multiplyPreferences{}
+		options := rawToken.Value
+		if strings.Contains(options, "+") {
+			prefs.AppendArrays = true
+		}
+		if strings.Contains(options, "?") {
+			prefs.TraversePrefs = traversePreferences{DontAutoCreate: true}
+		}
+		if strings.Contains(options, "n") {
+			prefs.AssignPrefs = assignPreferences{OnlyWriteNull: true}
+		}
+		if strings.Contains(options, "d") {
+			prefs.DeepMergeArrays = true
+		}
+		prefs.TraversePrefs.DontFollowAlias = true
+		op := &Operation{OperationType: op, Value: multiplyOpType.Type, StringValue: options, Preferences: prefs}
+		return &token{TokenType: operationToken, Operation: op}, nil
+	}
+
+}
+
+func getVariableOpToken() yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		value := rawToken.Value
+
+		value = value[1:]
+
+		getVarOperation := createValueOperation(value, value)
+		getVarOperation.OperationType = getVariableOpType
+
+		return &token{TokenType: operationToken, Operation: getVarOperation, CheckForPostTraverse: true}, nil
+	}
+}
+
+func hexValue() yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		var originalString = rawToken.Value
+		var numberString = originalString[2:]
+		log.Debugf("numberString: %v", numberString)
+		var number, errParsingInt = strconv.ParseInt(numberString, 16, 64)
+		if errParsingInt != nil {
+			return nil, errParsingInt
+		}
+
+		return &token{TokenType: operationToken, Operation: createValueOperation(number, originalString)}, nil
+	}
+}
+
+func floatValue() yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		var numberString = rawToken.Value
+		var number, errParsingInt = strconv.ParseFloat(numberString, 64)
+		if errParsingInt != nil {
+			return nil, errParsingInt
+		}
+		return &token{TokenType: operationToken, Operation: createValueOperation(number, numberString)}, nil
+	}
+}
+
+func numberValue() yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		var numberString = rawToken.Value
+		var number, errParsingInt = strconv.ParseInt(numberString, 10, 64)
+		if errParsingInt != nil {
+			return nil, errParsingInt
+		}
+
+		return &token{TokenType: operationToken, Operation: createValueOperation(number, numberString)}, nil
+	}
+}
+
+func encodeParseIndent(outputFormat PrinterOutputFormat) yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		value := rawToken.Value
+		var indent, errParsingInt = extractNumberParameter(value)
+		if errParsingInt != nil {
+			return nil, errParsingInt
+		}
+
+		prefs := encoderPreferences{format: outputFormat, indent: indent}
+		op := &Operation{OperationType: encodeOpType, Value: encodeOpType.Type, StringValue: value, Preferences: prefs}
+		return &token{TokenType: operationToken, Operation: op}, nil
+	}
+}
+
+func encodeWithIndent(outputFormat PrinterOutputFormat, indent int) yqAction {
+	prefs := encoderPreferences{format: outputFormat, indent: indent}
+	return opTokenWithPrefs(encodeOpType, nil, prefs)
+}
+
+func decodeOp(inputFormat InputFormat) yqAction {
+	prefs := decoderPreferences{format: inputFormat}
+	return opTokenWithPrefs(decodeOpType, nil, prefs)
+}
+
+func loadOp(decoder Decoder, loadAsString bool) yqAction {
+	prefs := loadPrefs{decoder: decoder, loadAsString: loadAsString}
+	return opTokenWithPrefs(loadOpType, nil, prefs)
+}
+
+func opToken(op *operationType) yqAction {
+	return opTokenWithPrefs(op, nil, nil)
+}
+
+func literalToken(tt tokenType, checkForPost bool) yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		return &token{TokenType: tt, CheckForPostTraverse: checkForPost, Match: rawToken.Value}, nil
+	}
+}
+
+func (p *participleLexer) getYqDefinition(rawToken lexer.Token) *participleYqRule {
+	for _, yqRule := range participleYqRules {
+		if yqRule.ParticipleTokenType == rawToken.Type {
+			return yqRule
+		}
+	}
+	return &participleYqRule{}
+}
+
+func (p *participleLexer) Tokenise(expression string) ([]*token, error) {
+	myLexer, err := p.lexerDefinition.LexString("", expression)
+	if err != nil {
+		return nil, err
+	}
+	tokens := make([]*token, 0)
+
+	for {
+		rawToken, e := myLexer.Next()
+		if e != nil {
+			return nil, e
+		} else if rawToken.Type == lexer.EOF {
+			return postProcessTokens(tokens), nil
+		}
+
+		definition := p.getYqDefinition(rawToken)
+		if definition.CreateYqToken != nil {
+			token, e := definition.CreateYqToken(rawToken)
+			if e != nil {
+				return nil, e
+			}
+			tokens = append(tokens, token)
+		}
+
+	}
+
+}

pkg/yqlib/lexer_participle_test.go

@@ -0,0 +1,537 @@
+package yqlib
+
+import (
+	"testing"
+
+	"github.com/alecthomas/repr"
+	"github.com/mikefarah/yq/v4/test"
+	"gopkg.in/yaml.v3"
+)
+
+type participleLexerScenario struct {
+	expression string
+	tokens     []*token
+}
+
+var participleLexerScenarios = []participleLexerScenario{
+	{
+		expression: ".a",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: traversePathOpType,
+					Value:         "a",
+					StringValue:   "a",
+					Preferences:   traversePreferences{},
+				},
+				CheckForPostTraverse: true,
+			},
+		},
+	},
+	{
+		expression: ".a.b",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: traversePathOpType,
+					Value:         "a",
+					StringValue:   "a",
+					Preferences:   traversePreferences{},
+				},
+				CheckForPostTraverse: true,
+			},
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: shortPipeOpType,
+					Value:         "PIPE",
+					StringValue:   ".",
+					Preferences:   nil,
+				},
+			},
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: traversePathOpType,
+					Value:         "b",
+					StringValue:   "b",
+					Preferences:   traversePreferences{},
+				},
+				CheckForPostTraverse: true,
+			},
+		},
+	},
+	{
+		expression: ".a.b?",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: traversePathOpType,
+					Value:         "a",
+					StringValue:   "a",
+					Preferences:   traversePreferences{},
+				},
+				CheckForPostTraverse: true,
+			},
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: shortPipeOpType,
+					Value:         "PIPE",
+					StringValue:   ".",
+					Preferences:   nil,
+				},
+			},
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: traversePathOpType,
+					Value:         "b",
+					StringValue:   "b",
+					Preferences: traversePreferences{
+						OptionalTraverse: true,
+					},
+				},
+				CheckForPostTraverse: true,
+			},
+		},
+	},
+	{
+		expression: `.a."b?"`,
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: traversePathOpType,
+					Value:         "a",
+					StringValue:   "a",
+					Preferences:   traversePreferences{},
+				},
+				CheckForPostTraverse: true,
+			},
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: shortPipeOpType,
+					Value:         "PIPE",
+					StringValue:   ".",
+					Preferences:   nil,
+				},
+			},
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: traversePathOpType,
+					Value:         "b?",
+					StringValue:   "b?",
+					Preferences:   traversePreferences{},
+				},
+				CheckForPostTraverse: true,
+			},
+		},
+	},
+	{
+		expression: `   .a  ."b?"`,
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: traversePathOpType,
+					Value:         "a",
+					StringValue:   "a",
+					Preferences:   traversePreferences{},
+				},
+				CheckForPostTraverse: true,
+			},
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: shortPipeOpType,
+					Value:         "PIPE",
+					StringValue:   ".",
+					Preferences:   nil,
+				},
+			},
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: traversePathOpType,
+					Value:         "b?",
+					StringValue:   "b?",
+					Preferences:   traversePreferences{},
+				},
+				CheckForPostTraverse: true,
+			},
+		},
+	},
+	{
+		expression: `.a | .b`,
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: traversePathOpType,
+					Value:         "a",
+					StringValue:   "a",
+					Preferences:   traversePreferences{},
+				},
+				CheckForPostTraverse: true,
+			},
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: pipeOpType,
+					Value:         "PIPE",
+					StringValue:   "|",
+					Preferences:   nil,
+				},
+			},
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: traversePathOpType,
+					Value:         "b",
+					StringValue:   "b",
+					Preferences:   traversePreferences{},
+				},
+				CheckForPostTraverse: true,
+			},
+		},
+	},
+	{
+		expression: "(.a)",
+		tokens: []*token{
+			{
+				TokenType: openBracket,
+				Match:     "(",
+			},
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: traversePathOpType,
+					Value:         "a",
+					StringValue:   "a",
+					Preferences:   traversePreferences{},
+				},
+				CheckForPostTraverse: true,
+			},
+			{
+				TokenType:            closeBracket,
+				Match:                ")",
+				CheckForPostTraverse: true,
+			},
+		},
+	},
+	{
+		expression: "..",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: recursiveDescentOpType,
+					Value:         "RECURSIVE_DESCENT",
+					StringValue:   "..",
+					Preferences: recursiveDescentPreferences{
+						RecurseArray: true,
+						TraversePreferences: traversePreferences{
+							DontFollowAlias: true,
+							IncludeMapKeys:  false,
+						},
+					},
+				},
+			},
+		},
+	},
+	{
+		expression: "...",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: recursiveDescentOpType,
+					Value:         "RECURSIVE_DESCENT",
+					StringValue:   "...",
+					Preferences: recursiveDescentPreferences{
+						RecurseArray: true,
+						TraversePreferences: traversePreferences{
+							DontFollowAlias: true,
+							IncludeMapKeys:  true,
+						},
+					},
+				},
+			},
+		},
+	},
+	{
+		expression: ".a,.b",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: traversePathOpType,
+					Value:         "a",
+					StringValue:   "a",
+					Preferences:   traversePreferences{},
+				},
+				CheckForPostTraverse: true,
+			},
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: unionOpType,
+					Value:         "UNION",
+					StringValue:   ",",
+					Preferences:   nil,
+				},
+			},
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: traversePathOpType,
+					Value:         "b",
+					StringValue:   "b",
+					Preferences:   traversePreferences{},
+				},
+				CheckForPostTraverse: true,
+			},
+		},
+	},
+	{
+		expression: "map_values",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: mapValuesOpType,
+					Value:         "MAP_VALUES",
+					StringValue:   "map_values",
+					Preferences:   nil,
+				},
+			},
+		},
+	},
+	{
+		expression: "mapvalues",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: mapValuesOpType,
+					Value:         "MAP_VALUES",
+					StringValue:   "mapvalues",
+					Preferences:   nil,
+				},
+			},
+		},
+	},
+	{
+		expression: "flatten(3)",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: flattenOpType,
+					Value:         "FLATTEN_BY",
+					StringValue:   "flatten(3)",
+					Preferences:   flattenPreferences{depth: 3},
+				},
+			},
+		},
+	},
+	{
+		expression: "flatten",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: flattenOpType,
+					Value:         "FLATTEN_BY",
+					StringValue:   "flatten",
+					Preferences:   flattenPreferences{depth: -1},
+				},
+			},
+		},
+	},
+	{
+		expression: "length",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: lengthOpType,
+					Value:         "LENGTH",
+					StringValue:   "length",
+					Preferences:   nil,
+				},
+			},
+		},
+	},
+	{
+		expression: "format_datetime",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: formatDateTimeOpType,
+					Value:         "FORMAT_DATE_TIME",
+					StringValue:   "format_datetime",
+					Preferences:   nil,
+				},
+			},
+		},
+	},
+	{
+		expression: "to_yaml(3)",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: encodeOpType,
+					Value:         "ENCODE",
+					StringValue:   "to_yaml(3)",
+					Preferences: encoderPreferences{
+						format: YamlOutputFormat,
+						indent: 3,
+					},
+				},
+			},
+		},
+	},
+	{
+		expression: "tojson(2)",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: encodeOpType,
+					Value:         "ENCODE",
+					StringValue:   "tojson(2)",
+					Preferences: encoderPreferences{
+						format: JSONOutputFormat,
+						indent: 2,
+					},
+				},
+			},
+		},
+	},
+	{
+		expression: "@yaml",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: encodeOpType,
+					Value:         "ENCODE",
+					StringValue:   "@yaml",
+					Preferences: encoderPreferences{
+						format: YamlOutputFormat,
+						indent: 2,
+					},
+				},
+			},
+		},
+	},
+	{
+		expression: "to_props",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: encodeOpType,
+					Value:         "ENCODE",
+					StringValue:   "to_props",
+					Preferences: encoderPreferences{
+						format: PropsOutputFormat,
+						indent: 2,
+					},
+				},
+			},
+		},
+	},
+	{
+		expression: "@base64d",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: decodeOpType,
+					Value:         "DECODE",
+					StringValue:   "@base64d",
+					Preferences: decoderPreferences{
+						format: Base64InputFormat,
+					},
+				},
+			},
+		},
+	},
+	{
+		expression: "@base64",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: encodeOpType,
+					Value:         "ENCODE",
+					StringValue:   "@base64",
+					Preferences: encoderPreferences{
+						format: Base64OutputFormat,
+					},
+				},
+			},
+		},
+	},
+	{
+		expression: "@yamld",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: decodeOpType,
+					Value:         "DECODE",
+					StringValue:   "@yamld",
+					Preferences: decoderPreferences{
+						format: YamlInputFormat,
+					},
+				},
+			},
+		},
+	},
+	{
+		expression: `"string with a \""`,
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: valueOpType,
+					Value:         `string with a "`,
+					StringValue:   `string with a "`,
+					Preferences:   nil,
+					CandidateNode: &CandidateNode{
+						Node: &yaml.Node{
+							Kind:  yaml.ScalarNode,
+							Tag:   "!!str",
+							Value: `string with a "`,
+						},
+					},
+				},
+			},
+		},
+	},
+}
+
+func TestParticipleLexer(t *testing.T) {
+	lexer := newParticipleLexer()
+
+	for _, scenario := range participleLexerScenarios {
+		actual, err := lexer.Tokenise(scenario.expression)
+		if err != nil {
+			t.Error(err)
+		} else {
+			test.AssertResultWithContext(t, repr.String(scenario.tokens, repr.Indent(" ")), repr.String(actual, repr.Indent(" ")), scenario.expression)
+		}
+
+	}
+}

pkg/yqlib/lib.go

@@ -6,6 +6,7 @@ import (
 	"bytes"
 	"container/list"
 	"fmt"
+	"math"
 	"strconv"
 	"strings"
 
@@ -24,6 +25,9 @@ func InitExpressionParser() {
 type xmlPreferences struct {
 	AttributePrefix string
 	ContentName     string
+	StrictMode      bool
+	KeepNamespace   bool
+	UseRawToken     bool
 }
 
 var log = logging.MustGetLogger("yq-lib")
@@ -72,7 +76,9 @@ var subtractOpType = &operationType{Type: "SUBTRACT", NumArgs: 2, Precedence: 42
 var alternativeOpType = &operationType{Type: "ALTERNATIVE", NumArgs: 2, Precedence: 42, Handler: alternativeOperator}
 
 var equalsOpType = &operationType{Type: "EQUALS", NumArgs: 2, Precedence: 40, Handler: equalsOperator}
-var notEqualsOpType = &operationType{Type: "EQUALS", NumArgs: 2, Precedence: 40, Handler: notEqualsOperator}
+var notEqualsOpType = &operationType{Type: "NOT_EQUALS", NumArgs: 2, Precedence: 40, Handler: notEqualsOperator}
+
+var compareOpType = &operationType{Type: "COMPARE", NumArgs: 2, Precedence: 40, Handler: compareOperator}
 
 //createmap needs to be above union, as we use union to build the components of the objects
 var createMapOpType = &operationType{Type: "CREATE_MAP", NumArgs: 2, Precedence: 15, Handler: createMapOperator}
@@ -85,6 +91,7 @@ var columnOpType = &operationType{Type: "LINE", NumArgs: 0, Precedence: 50, Hand
 
 var collectOpType = &operationType{Type: "COLLECT", NumArgs: 1, Precedence: 50, Handler: collectOperator}
 var mapOpType = &operationType{Type: "MAP", NumArgs: 1, Precedence: 50, Handler: mapOperator}
+var errorOpType = &operationType{Type: "ERROR", NumArgs: 1, Precedence: 50, Handler: errorOperator}
 var pickOpType = &operationType{Type: "PICK", NumArgs: 1, Precedence: 50, Handler: pickOperator}
 var evalOpType = &operationType{Type: "EVAL", NumArgs: 1, Precedence: 50, Handler: evalOperator}
 var mapValuesOpType = &operationType{Type: "MAP_VALUES", NumArgs: 1, Precedence: 50, Handler: mapValuesOperator}
@@ -119,7 +126,7 @@ var getParentOpType = &operationType{Type: "GET_PARENT", NumArgs: 0, Precedence:
 
 var getCommentOpType = &operationType{Type: "GET_COMMENT", NumArgs: 0, Precedence: 50, Handler: getCommentsOperator}
 var getAnchorOpType = &operationType{Type: "GET_ANCHOR", NumArgs: 0, Precedence: 50, Handler: getAnchorOperator}
-var getAliasOptype = &operationType{Type: "GET_ALIAS", NumArgs: 0, Precedence: 50, Handler: getAliasOperator}
+var getAliasOpType = &operationType{Type: "GET_ALIAS", NumArgs: 0, Precedence: 50, Handler: getAliasOperator}
 var getDocumentIndexOpType = &operationType{Type: "GET_DOCUMENT_INDEX", NumArgs: 0, Precedence: 50, Handler: getDocumentIndexOperator}
 var getFilenameOpType = &operationType{Type: "GET_FILENAME", NumArgs: 0, Precedence: 50, Handler: getFilenameOperator}
 var getFileIndexOpType = &operationType{Type: "GET_FILE_INDEX", NumArgs: 0, Precedence: 50, Handler: getFileIndexOperator}
@@ -198,10 +205,10 @@ func findInArray(array *yaml.Node, item *yaml.Node) int {
 	return -1
 }
 
-func findKeyInMap(array *yaml.Node, item *yaml.Node) int {
+func findKeyInMap(dataMap *yaml.Node, item *yaml.Node) int {
 
-	for index := 0; index < len(array.Content); index = index + 2 {
-		if recursiveNodeEqual(array.Content[index], item) {
+	for index := 0; index < len(dataMap.Content); index = index + 2 {
+		if recursiveNodeEqual(dataMap.Content[index], item) {
 			return index
 		}
 	}
@@ -233,20 +240,28 @@ func guessTagFromCustomType(node *yaml.Node) string {
 		log.Warning("node has no value to guess the type with")
 		return node.Tag
 	}
+	dataBucket, errorReading := parseSnippet(node.Value)
 
-	decoder := NewYamlDecoder()
-	decoder.Init(strings.NewReader(node.Value))
-	var dataBucket yaml.Node
-	errorReading := decoder.Decode(&dataBucket)
 	if errorReading != nil {
 		log.Warning("could not guess underlying tag type %v", errorReading)
 		return node.Tag
 	}
-	guessedTag := unwrapDoc(&dataBucket).Tag
+	guessedTag := unwrapDoc(dataBucket).Tag
 	log.Info("im guessing the tag %v is a %v", node.Tag, guessedTag)
 	return guessedTag
 }
 
+func parseSnippet(value string) (*yaml.Node, error) {
+	decoder := NewYamlDecoder()
+	decoder.Init(strings.NewReader(value))
+	var dataBucket yaml.Node
+	err := decoder.Decode(&dataBucket)
+	if len(dataBucket.Content) == 0 {
+		return nil, fmt.Errorf("bad data")
+	}
+	return dataBucket.Content[0], err
+}
+
 func recursiveNodeEqual(lhs *yaml.Node, rhs *yaml.Node) bool {
 	if lhs.Kind != rhs.Kind {
 		return false
@@ -317,7 +332,7 @@ func deepCloneWithOptions(node *yaml.Node, cloneContent bool) *yaml.Node {
 }
 
 // yaml numbers can be hex encoded...
-func parseInt(numberString string) (string, int64, error) {
+func parseInt64(numberString string) (string, int64, error) {
 	if strings.HasPrefix(numberString, "0x") ||
 		strings.HasPrefix(numberString, "0X") {
 		num, err := strconv.ParseInt(numberString[2:], 16, 64)
@@ -327,6 +342,32 @@ func parseInt(numberString string) (string, int64, error) {
 	return "%v", num, err
 }
 
+func parseInt(numberString string) (int, error) {
+	var err error
+	var parsed int64
+	if strings.HasPrefix(numberString, "0x") ||
+		strings.HasPrefix(numberString, "0X") {
+		parsed, err = strconv.ParseInt(numberString[2:], 16, 64)
+	} else {
+		parsed, err = strconv.ParseInt(numberString, 10, 64)
+	}
+
+	if err != nil {
+		return 0, err
+	} else if parsed > math.MaxInt {
+		return 0, fmt.Errorf("%v is too big (larger than %v)", parsed, math.MaxInt)
+	}
+
+	return int(parsed), err
+}
+
+func createStringScalarNode(stringValue string) *yaml.Node {
+	var node = &yaml.Node{Kind: yaml.ScalarNode}
+	node.Value = stringValue
+	node.Tag = "!!str"
+	return node
+}
+
 func createScalarNode(value interface{}, stringValue string) *yaml.Node {
 	var node = &yaml.Node{Kind: yaml.ScalarNode}
 	node.Value = stringValue

pkg/yqlib/operator_add.go

@@ -56,7 +56,9 @@ func add(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *Candida
 		return lhs.CreateReplacement(rhs.Node), nil
 	}
 
-	target := lhs.CreateReplacement(&yaml.Node{})
+	target := lhs.CreateReplacement(&yaml.Node{
+		Anchor: lhs.Node.Anchor,
+	})
 
 	switch lhsNode.Kind {
 	case yaml.MappingNode:
@@ -103,12 +105,15 @@ func addScalars(context Context, target *CandidateNode, lhs *yaml.Node, rhs *yam
 	} else if lhsTag == "!!str" {
 		target.Node.Tag = lhs.Tag
 		target.Node.Value = lhs.Value + rhs.Value
+	} else if rhsTag == "!!str" {
+		target.Node.Tag = rhs.Tag
+		target.Node.Value = lhs.Value + rhs.Value
 	} else if lhsTag == "!!int" && rhsTag == "!!int" {
-		format, lhsNum, err := parseInt(lhs.Value)
+		format, lhsNum, err := parseInt64(lhs.Value)
 		if err != nil {
 			return err
 		}
-		_, rhsNum, err := parseInt(rhs.Value)
+		_, rhsNum, err := parseInt64(rhs.Value)
 		if err != nil {
 			return err
 		}
@@ -161,15 +166,13 @@ func addSequences(target *CandidateNode, lhs *CandidateNode, rhs *CandidateNode)
 		target.Node.Style = lhs.Node.Style
 	}
 	target.Node.Tag = lhs.Node.Tag
-	target.Node.Content = make([]*yaml.Node, len(lhs.Node.Content))
-	copy(target.Node.Content, lhs.Node.Content)
 
 	extraNodes, err := toNodes(rhs, lhs)
 	if err != nil {
 		return err
 	}
 
-	target.Node.Content = append(target.Node.Content, extraNodes...)
+	target.Node.Content = append(deepCloneContent(lhs.Node.Content), extraNodes...)
 	return nil
 
 }
@@ -185,7 +188,7 @@ func addMaps(target *CandidateNode, lhsC *CandidateNode, rhsC *CandidateNode) {
 		key := rhs.Content[index]
 		value := rhs.Content[index+1]
 		log.Debug("finding %v", key.Value)
-		indexInLHS := findInArray(target.Node, key)
+		indexInLHS := findKeyInMap(target.Node, key)
 		log.Debug("indexInLhs %v", indexInLHS)
 		if indexInLHS < 0 {
 			// not in there, append it

pkg/yqlib/operator_add_test.go

@@ -14,6 +14,23 @@ var addOperatorScenarios = []expressionScenario{
 			"D0, P[1 a], (!!int)::3\n",
 		},
 	},
+	{
+		skipDoc:    true,
+		document:   `a: key`,
+		expression: `. += {"key": "b"}`,
+		expected: []string{
+			"D0, P[], (!!map)::a: key\nkey: b\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `[[c], [b]]`,
+		expression: `.[] | . += "a"`,
+		expected: []string{
+			"D0, P[0], (!!seq)::[c, a]\n",
+			"D0, P[1], (!!seq)::[b, a]\n",
+		},
+	},
 	{
 		skipDoc:    true,
 		document:   `{}`,
@@ -182,6 +199,24 @@ var addOperatorScenarios = []expressionScenario{
 			"D0, P[], (doc)::{a: catmeow, b: meow}\n",
 		},
 	},
+	{
+		description: "String concatenation - str + int",
+		skipDoc:     true,
+		document:    `{a: !cool cat, b: meow}`,
+		expression:  `.a + 3`,
+		expected: []string{
+			"D0, P[a], (!cool)::cat3\n",
+		},
+	},
+	{
+		description: "String concatenation - int + str",
+		skipDoc:     true,
+		document:    `{a: !cool cat, b: meow}`,
+		expression:  `3 + .a`,
+		expected: []string{
+			"D0, P[], (!cool)::3cat\n",
+		},
+	},
 	{
 		description:    "Number addition - float",
 		subdescription: "If the lhs or rhs are floats then the expression will be calculated with floats.",
@@ -306,6 +341,15 @@ var addOperatorScenarios = []expressionScenario{
 			"D0, P[], (doc)::a: !horse [a, b]\nb: !goat [b]\n",
 		},
 	},
+	{
+		skipDoc:     true,
+		description: "Keep anchors",
+		document:    "a: &horse [1]",
+		expression:  `.a += 2`,
+		expected: []string{
+			"D0, P[], (doc)::a: &horse [1, 2]\n",
+		},
+	},
 }
 
 func TestAddOperatorScenarios(t *testing.T) {

pkg/yqlib/operator_assign.go

@@ -22,8 +22,10 @@ func assignUpdateOperator(d *dataTreeNavigator, context Context, expressionNode
 	}
 
 	prefs := assignPreferences{}
-	if expressionNode.Operation.Preferences != nil {
-		prefs = expressionNode.Operation.Preferences.(assignPreferences)
+	// they way *= (multipleAssign) is handled, we set the multiplePrefs
+	// on the node, not assignPrefs. Long story.
+	if p, ok := expressionNode.Operation.Preferences.(assignPreferences); ok {
+		prefs = p
 	}
 
 	if !expressionNode.Operation.UpdateAssign {

pkg/yqlib/operator_assign_test.go

@@ -17,7 +17,7 @@ var assignOperatorScenarios = []expressionScenario{
 		document:   "{}",
 		expression: `.a |= .b`,
 		expected: []string{
-			"D0, P[], (doc)::{a: null}\n",
+			"D0, P[], (doc)::a: null\n",
 		},
 	},
 	{
@@ -25,7 +25,7 @@ var assignOperatorScenarios = []expressionScenario{
 		document:   "{}",
 		expression: `.a = .b`,
 		expected: []string{
-			"D0, P[], (doc)::{a: null}\n",
+			"D0, P[], (doc)::a: null\n",
 		},
 	},
 	{
@@ -101,9 +101,9 @@ var assignOperatorScenarios = []expressionScenario{
 	{
 		description: "Updated multiple paths",
 		document:    `{a: fieldA, b: fieldB, c: fieldC}`,
-		expression:  `(.a, .c) = "potatoe"`,
+		expression:  `(.a, .c) = "potato"`,
 		expected: []string{
-			"D0, P[], (doc)::{a: potatoe, b: fieldB, c: potatoe}\n",
+			"D0, P[], (doc)::{a: potato, b: fieldB, c: potato}\n",
 		},
 	},
 	{
@@ -149,7 +149,7 @@ var assignOperatorScenarios = []expressionScenario{
 	},
 	{
 		description:    "Update deeply selected results",
-		subdescription: "Note that the LHS is wrapped in brackets! This is to ensure we dont first filter out the yaml and then update the snippet.",
+		subdescription: "Note that the LHS is wrapped in brackets! This is to ensure we don't first filter out the yaml and then update the snippet.",
 		document:       `{a: {b: apple, c: cactus}}`,
 		expression:     `(.a[] | select(. == "apple")) = "frog"`,
 		expected: []string{
@@ -178,7 +178,7 @@ var assignOperatorScenarios = []expressionScenario{
 		document:              `{}`,
 		expression:            `.a.b |= "bogs"`,
 		expected: []string{
-			"D0, P[], (doc)::{a: {b: bogs}}\n",
+			"D0, P[], (doc)::a:\n    b: bogs\n",
 		},
 	},
 	{
@@ -197,7 +197,7 @@ var assignOperatorScenarios = []expressionScenario{
 		document:              `{}`,
 		expression:            `.a.b.[0] |= "bogs"`,
 		expected: []string{
-			"D0, P[], (doc)::{a: {b: [bogs]}}\n",
+			"D0, P[], (doc)::a:\n    b:\n        - bogs\n",
 		},
 	},
 	{
@@ -205,7 +205,7 @@ var assignOperatorScenarios = []expressionScenario{
 		document:   `{}`,
 		expression: `.a.b.[1].c |= "bogs"`,
 		expected: []string{
-			"D0, P[], (doc)::{a: {b: [null, {c: bogs}]}}\n",
+			"D0, P[], (doc)::a:\n    b:\n        - null\n        - c: bogs\n",
 		},
 	},
 }

pkg/yqlib/operator_booleans.go

@@ -27,41 +27,48 @@ func isTruthy(c *CandidateNode) (bool, error) {
 	return isTruthyNode(node)
 }
 
-type boolOp func(bool, bool) bool
+func getBoolean(candidate *CandidateNode) (bool, error) {
+	if candidate != nil {
+		candidate.Node = unwrapDoc(candidate.Node)
+		return isTruthy(candidate)
+	}
+	return false, nil
+}
 
-func performBoolOp(op boolOp) func(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
-	return func(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
-		owner := lhs
+func getOwner(lhs *CandidateNode, rhs *CandidateNode) *CandidateNode {
+	owner := lhs
 
-		if lhs == nil && rhs == nil {
-			owner = &CandidateNode{}
-		} else if lhs == nil {
-			owner = rhs
+	if lhs == nil && rhs == nil {
+		owner = &CandidateNode{}
+	} else if lhs == nil {
+		owner = rhs
+	}
+	return owner
+}
+
+func returnRhsTruthy(d *dataTreeNavigator, context Context, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+	owner := getOwner(lhs, rhs)
+	rhsBool, err := getBoolean(rhs)
+	if err != nil {
+		return nil, err
+	}
+
+	return createBooleanCandidate(owner, rhsBool), nil
+}
+
+func returnLHSWhen(targetBool bool) func(lhs *CandidateNode) (*CandidateNode, error) {
+	return func(lhs *CandidateNode) (*CandidateNode, error) {
+		var err error
+		var lhsBool bool
+
+		if lhsBool, err = getBoolean(lhs); err != nil || lhsBool != targetBool {
+			return nil, err
 		}
-
-		var errDecoding error
-		lhsTrue := false
+		owner := &CandidateNode{}
 		if lhs != nil {
-			lhs.Node = unwrapDoc(lhs.Node)
-			lhsTrue, errDecoding = isTruthy(lhs)
-
-			if errDecoding != nil {
-				return nil, errDecoding
-			}
+			owner = lhs
 		}
-		log.Debugf("-- lhsTrue", lhsTrue)
-
-		rhsTrue := false
-		if rhs != nil {
-			rhs.Node = unwrapDoc(rhs.Node)
-			rhsTrue, errDecoding = isTruthy(rhs)
-			if errDecoding != nil {
-				return nil, errDecoding
-			}
-		}
-		log.Debugf("-- rhsTrue", rhsTrue)
-
-		return createBooleanCandidate(owner, op(lhsTrue, rhsTrue)), nil
+		return createBooleanCandidate(owner, targetBool), nil
 	}
 }
 
@@ -133,20 +140,21 @@ func anyOperator(d *dataTreeNavigator, context Context, expressionNode *Expressi
 }
 
 func orOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
-	log.Debugf("-- orOp")
-	return crossFunction(d, context.ReadOnlyClone(), expressionNode, performBoolOp(
-		func(b1 bool, b2 bool) bool {
-			log.Debugf("-- peformingOrOp with %v and %v", b1, b2)
-			return b1 || b2
-		}), true)
+	prefs := crossFunctionPreferences{
+		CalcWhenEmpty:  true,
+		Calculation:    returnRhsTruthy,
+		LhsResultValue: returnLHSWhen(true),
+	}
+	return crossFunctionWithPrefs(d, context.ReadOnlyClone(), expressionNode, prefs)
 }
 
 func andOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
-	log.Debugf("-- AndOp")
-	return crossFunction(d, context.ReadOnlyClone(), expressionNode, performBoolOp(
-		func(b1 bool, b2 bool) bool {
-			return b1 && b2
-		}), true)
+	prefs := crossFunctionPreferences{
+		CalcWhenEmpty:  true,
+		Calculation:    returnRhsTruthy,
+		LhsResultValue: returnLHSWhen(false),
+	}
+	return crossFunctionWithPrefs(d, context.ReadOnlyClone(), expressionNode, prefs)
 }
 
 func notOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {

pkg/yqlib/operator_booleans_test.go

@@ -44,6 +44,22 @@ var booleanOperatorScenarios = []expressionScenario{
 			"D0, P[], (doc)::b: hi\n",
 		},
 	},
+	{
+		skipDoc:     true,
+		description: "And should not run 2nd arg if first is false",
+		expression:  `false and test(3)`,
+		expected: []string{
+			"D0, P[], (!!bool)::false\n",
+		},
+	},
+	{
+		skipDoc:     true,
+		description: "Or should not run 2nd arg if first is true",
+		expression:  `true or test(3)`,
+		expected: []string{
+			"D0, P[], (!!bool)::true\n",
+		},
+	},
 	{
 		description: "`and` example",
 		expression:  `true and false`,
@@ -151,12 +167,21 @@ var booleanOperatorScenarios = []expressionScenario{
 		document:   `{a: true, b: false}`,
 		expression: `.[] or (false, true)`,
 		expected: []string{
-			"D0, P[a], (!!bool)::true\n",
 			"D0, P[a], (!!bool)::true\n",
 			"D0, P[b], (!!bool)::false\n",
 			"D0, P[b], (!!bool)::true\n",
 		},
 	},
+	{
+		skipDoc:    true,
+		document:   `{a: true, b: false}`,
+		expression: `.[] and (false, true)`,
+		expected: []string{
+			"D0, P[a], (!!bool)::false\n",
+			"D0, P[a], (!!bool)::true\n",
+			"D0, P[b], (!!bool)::false\n",
+		},
+	},
 	{
 		skipDoc:    true,
 		document:   `{}`,

pkg/yqlib/operator_collect_object_test.go

@@ -115,12 +115,12 @@ var collectObjectOperatorScenarios = []expressionScenario{
 	},
 	{
 		skipDoc:    true,
-		document:   `{name: Mike, pets: {cows: [apl, bba]}}`,
-		document2:  `{name: Rosey, pets: {sheep: [frog, meow]}}`,
+		document:   "name: Mike\npets:\n  cows:\n    - apl\n    - bba",
+		document2:  "name: Rosey\npets:\n  sheep:\n    - frog\n    - meow",
 		expression: `{"a":.name, "b":.pets}`,
 		expected: []string{
-			"D0, P[], (!!map)::a: Mike\nb: {cows: [apl, bba]}\n",
-			"D0, P[], (!!map)::a: Rosey\nb: {sheep: [frog, meow]}\n",
+			"D0, P[], (!!map)::a: Mike\nb:\n    cows:\n        - apl\n        - bba\n",
+			"D0, P[], (!!map)::a: Rosey\nb:\n    sheep:\n        - frog\n        - meow\n",
 		},
 	},
 	{
@@ -154,6 +154,13 @@ var collectObjectOperatorScenarios = []expressionScenario{
 			"D0, P[], (!!map)::{wrap: {further: {name: Mike}}}\n",
 		},
 	},
+	{
+		description: "Creating yaml from scratch with multiple objects",
+		expression:  `(.a.b = "foo") | (.d.e = "bar")`,
+		expected: []string{
+			"D0, P[], ()::a:\n    b: foo\nd:\n    e: bar\n",
+		},
+	},
 }
 
 func TestCollectObjectOperatorScenarios(t *testing.T) {

pkg/yqlib/operator_collect_test.go

@@ -29,14 +29,23 @@ var collectOperatorScenarios = []expressionScenario{
 		},
 	},
 	{
-		skipDoc:  true,
-		document: "{a: apple}\n---\n{b: frog}",
-
+		skipDoc:    true,
+		document:   "{a: apple}\n---\n{b: frog}",
 		expression: `[.]`,
 		expected: []string{
 			"D0, P[], (!!seq)::- {a: apple}\n- {b: frog}\n",
 		},
 	},
+	{
+		description: "with comments",
+		skipDoc:     true,
+		document:    "# abc\n[{a: apple}]\n\n# xyz\n",
+
+		expression: `[.[]]`,
+		expected: []string{
+			"D0, P[], (!!seq)::- {a: apple}\n",
+		},
+	},
 	{
 		skipDoc:    true,
 		document:   ``,

pkg/yqlib/operator_comments.go

@@ -61,7 +61,9 @@ func assignCommentsOperator(d *dataTreeNavigator, context Context, expressionNod
 			candidate.Node.HeadComment = comment
 			candidate.LeadingContent = "" // clobber the leading content, if there was any.
 		}
-		if preferences.FootComment {
+		if preferences.FootComment && candidate.Node.Kind == yaml.DocumentNode && comment != "" {
+			candidate.TrailingContent = "# " + comment
+		} else if preferences.FootComment && candidate.Node.Kind != yaml.DocumentNode {
 			candidate.Node.FootComment = comment
 		}
 
@@ -97,6 +99,8 @@ func getCommentsOperator(d *dataTreeNavigator, context Context, expressionNode *
 			comment = chompRegexp.ReplaceAllString(comment, "")
 		} else if preferences.HeadComment {
 			comment = candidate.Node.HeadComment
+		} else if preferences.FootComment && candidate.Node.Kind == yaml.DocumentNode && candidate.TrailingContent != "" {
+			comment = candidate.TrailingContent
 		} else if preferences.FootComment {
 			comment = candidate.Node.FootComment
 		}
@@ -105,6 +109,7 @@ func getCommentsOperator(d *dataTreeNavigator, context Context, expressionNode *
 
 		node := &yaml.Node{Kind: yaml.ScalarNode, Value: comment, Tag: "!!str"}
 		result := candidate.CreateReplacement(node)
+		result.LeadingContent = "" // don't include the leading yaml content when retrieving a comment
 		results.PushBack(result)
 	}
 	return context.ChildContext(results), nil

pkg/yqlib/operator_comments_test.go

@@ -59,7 +59,7 @@ var commentOperatorScenarios = []expressionScenario{
 		document:    `a: cat`,
 		expression:  `. foot_comment=.a`,
 		expected: []string{
-			"D0, P[], (doc)::a: cat\n\n# cat\n",
+			"D0, P[], (doc)::a: cat\n# cat\n",
 		},
 	},
 	{