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Updated README, better xml docs

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Mike Farah 2022-01-22 12:35:33 +11:00
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4 changed files with 116 additions and 66 deletions
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25
README.md
View File

@ -3,7 +3,7 @@
![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)
a lightweight and portable command-line YAML processor. `yq` uses [jq](https://github.com/stedolan/jq) like syntax but works with yaml files as well as json. It doesn't yet support everything `jq` does - but it does support the most common operations and functions, and more is being added continuously.
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.
yq is written in go - so you can download a dependency free binary for your platform and you are good to go! If you prefer there are a variety of package managers that can be used as well as Docker and Podman, all listed below.
@ -241,19 +241,21 @@ Supported by @rmescandon (https://launchpad.net/~rmescandon/+archive/ubuntu/yq)
## Features
- [Detailed documentation with many examples](https://mikefarah.gitbook.io/yq/)
- Written in portable go, so you can download a lovely dependency free binary
- Uses similar syntax as `jq` but works with YAML and JSON files
- Uses similar syntax as `jq` but works with YAML, [JSON](https://mikefarah.gitbook.io/yq/usage/convert) and [XML](https://mikefarah.gitbook.io/yq/usage/xml) files
- Fully supports multi document yaml files
- Supports yaml [front matter](https://mikefarah.gitbook.io/yq/usage/front-matter) blocks (e.g. jekyll/assemble)
- Colorized yaml output
- [Deeply traverse yaml](https://mikefarah.gitbook.io/yq/operators/traverse-read)
- [Sort yaml by keys](https://mikefarah.gitbook.io/yq/operators/sort-keys)
- [Deeply data structures](https://mikefarah.gitbook.io/yq/operators/traverse-read)
- [Sort keys](https://mikefarah.gitbook.io/yq/operators/sort-keys)
- Manipulate yaml [comments](https://mikefarah.gitbook.io/yq/operators/comment-operators), [styling](https://mikefarah.gitbook.io/yq/operators/style), [tags](https://mikefarah.gitbook.io/yq/operators/tag) and [anchors and aliases](https://mikefarah.gitbook.io/yq/operators/anchor-and-alias-operators).
- [Update yaml inplace](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate#flags)
- [Update inplace](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate#flags)
- [Complex expressions to select and update](https://mikefarah.gitbook.io/yq/operators/select#select-and-update-matching-values-in-map)
- Keeps yaml formatting and comments when updating (though there are issues with whitespace)
- [Load content from other files](https://mikefarah.gitbook.io/yq/operators/load)
- [Convert to/from json](https://mikefarah.gitbook.io/yq/v/v4.x/usage/convert)
- [Convert to/from xml](https://mikefarah.gitbook.io/yq/v/v4.x/usage/xml)
- [Convert to properties](https://mikefarah.gitbook.io/yq/v/v4.x/usage/properties)
- [Convert to csv/tsv](https://mikefarah.gitbook.io/yq/usage/csv-tsv)
- [Pipe data in by using '-'](https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate)
- [General shell completion scripts (bash/zsh/fish/powershell)](https://mikefarah.gitbook.io/yq/v/v4.x/commands/shell-completion)
- [Reduce](https://mikefarah.gitbook.io/yq/operators/reduce) to merge multiple files or sum an array or other fancy things.
@ -269,6 +271,7 @@ Usage:
yq [command]
Available Commands:
completion Generate the autocompletion script for the specified shell
eval Apply the expression to each document in each yaml file in sequence
eval-all Loads _all_ yaml documents of _all_ yaml files and runs expression once
help Help about any command
@ -278,18 +281,22 @@ Flags:
-C, --colors force print with colors
-e, --exit-status set exit status if there are no matches or null or false is returned
-f, --front-matter string (extract|process) first input as yaml front-matter. Extract will pull out the yaml content, process will run the expression against the yaml content, leaving the remaining data intact
--header-preprocess Slurp any header comments and seperators before processing expression. This is a workaround for go-yaml to persist header content (default true)
--header-preprocess Slurp any header comments and separators before processing expression. (default true)
-h, --help help for yq
-I, --indent int sets indent level for output (default 2)
-i, --inplace update the yaml file inplace of first yaml file given.
-i, --inplace update the file inplace of first file given.
-p, --input-format string [yaml|y|xml|x] parse format for input. Note that json is a subset of yaml. (default "yaml")
-M, --no-colors force print with no colors
-N, --no-doc Don't print document separators (---)
-n, --null-input Don't read input, simply evaluate the expression given. Useful for creating yaml docs from scratch.
-o, --output-format string [yaml|y|json|j|props|p] output format type. (default "yaml")
-n, --null-input Don't read input, simply evaluate the expression given. Useful for creating docs from scratch.
-o, --output-format string [yaml|y|json|j|props|p|xml|x] output format type. (default "yaml")
-P, --prettyPrint pretty print, shorthand for '... style = ""'
-s, --split-exp string 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.
--unwrapScalar unwrap scalar, print the value with no quotes, colors or comments (default true)
-v, --verbose verbose mode
-V, --version Print version information and quit
--xml-attribute-prefix string prefix for xml attributes (default "+")
--xml-content-name string name for xml content (if no attribute name is present). (default "+content")
Use "yq [command] --help" for more information about a command.
```

14
pkg/yqlib/doc/usage/headers/xml.md
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@ -4,16 +4,4 @@ Encode and decode to and from XML. Whitespace is not conserved for round trips -
Consecutive xml nodes with the same name are assumed to be arrays.
All values in XML are assumed to be strings - but you can use `from_yaml` to parse them into their correct types:
```
yq e -p=xml '.myNumberField |= from_yaml' my.xml
```
```xml
<cat name="tiger">meow</cat>
```
The content of the node will be set as a field in the map with the key "+content". Use the `--xml-content-name` flag to change this.
XML content data and attributes are created as fields. This can be controlled by the `'--xml-attribute-prefix` and `--xml-content-name` flags - see below for examples.

61
pkg/yqlib/doc/usage/xml.md
View File

@ -4,25 +4,19 @@ Encode and decode to and from XML. Whitespace is not conserved for round trips -
Consecutive xml nodes with the same name are assumed to be arrays.
All values in XML are assumed to be strings - but you can use `from_yaml` to parse them into their correct types:
```
yq e -p=xml '.myNumberField |= from_yaml' my.xml
```
```xml
<cat name="tiger">meow</cat>
```
The content of the node will be set as a field in the map with the key "+content". Use the `--xml-content-name` flag to change this.
XML content data and attributes are created as fields. This can be controlled by the `'--xml-attribute-prefix` and `--xml-content-name` flags - see below for examples.
## Parse xml: simple
Notice how all the values are strings, see the next example on how you can fix that.
Given a sample.xml file of:
```xml
<?xml version="1.0" encoding="UTF-8"?>
<cat>meow</cat>
<cat>
<says>meow</says>
<legs>4</legs>
<cute>true</cute>
</cat>
```
then
```bash
@ -30,7 +24,34 @@ yq e -p=xml '.' sample.xml
```
will output
```yaml
cat: meow
cat:
says: meow
legs: "4"
cute: "true"
```
## Parse xml: number
All values are assumed to be strings when parsing XML, but you can use the `from_yaml` operator on all the strings values to autoparse into the correct type.
Given a sample.xml file of:
```xml
<?xml version="1.0" encoding="UTF-8"?>
<cat>
<says>meow</says>
<legs>4</legs>
<cute>true</cute>
</cat>
```
then
```bash
yq e -p=xml ' (.. | select(tag == "!!str")) |= from_yaml' sample.xml
```
will output
```yaml
cat:
says: meow
legs: 4
cute: true
```
## Parse xml: array
@ -39,8 +60,8 @@ Consecutive nodes with identical xml names are assumed to be arrays.
Given a sample.xml file of:
```xml
<?xml version="1.0" encoding="UTF-8"?>
<animal>1</animal>
<animal>2</animal>
<animal>cat</animal>
<animal>goat</animal>
```
then
```bash
@ -49,8 +70,8 @@ yq e -p=xml '.' sample.xml
will output
```yaml
animal:
- "1"
- "2"
- cat
- goat
```
## Parse xml: attributes
@ -75,7 +96,7 @@ cat:
```
## Parse xml: attributes with content
Content is added as a field, using the default content name of '+content'. Use `--xml-content-name` to set your own.
Content is added as a field, using the default content name of `+content`. Use `--xml-content-name` to set your own.
Given a sample.xml file of:
```xml

58
pkg/yqlib/xml_test.go
View File

@ -11,17 +11,39 @@ import (
yaml "gopkg.in/yaml.v3"
)
func decodeXml(t *testing.T, xml string) *CandidateNode {
func decodeXml(t *testing.T, s formatScenario) *CandidateNode {
decoder := NewXmlDecoder("+", "+content")
decoder.Init(strings.NewReader(xml))
decoder.Init(strings.NewReader(s.input))
node := &yaml.Node{}
err := decoder.Decode(node)
if err != nil {
t.Error(err, "fail to decode", xml)
t.Error(err, "fail to decode", s.input)
}
return &CandidateNode{Node: node}
expression := s.expression
if expression == "" {
expression = "."
}
exp, err := NewExpressionParser().ParseExpression(expression)
if err != nil {
t.Error(err)
return nil
}
candidateNode := CandidateNode{Node: node}
context, err := NewDataTreeNavigator().GetMatchingNodes(Context{MatchingNodes: candidateNode.AsList()}, exp)
if err != nil {
t.Error(err)
return nil
}
return context.MatchingNodes.Front().Value.(*CandidateNode)
}
func processXmlScenario(s formatScenario) string {
@ -208,14 +230,22 @@ var expectedXmlWithComments = `<!-- above_cat inline_cat --><cat><!-- above_arra
var xmlScenarios = []formatScenario{
{
description: "Parse xml: simple",
input: "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<cat>meow</cat>",
expected: "D0, P[], (doc)::cat: meow\n",
subdescription: "Notice how all the values are strings, see the next example on how you can fix that.",
input: "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<cat>\n <says>meow</says>\n <legs>4</legs>\n <cute>true</cute>\n</cat>",
expected: "D0, P[], (doc)::cat:\n says: meow\n legs: \"4\"\n cute: \"true\"\n",
},
{
description: "Parse xml: number",
subdescription: "All values are assumed to be strings when parsing XML, but you can use the `from_yaml` operator on all the strings values to autoparse into the correct type.",
input: "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<cat>\n <says>meow</says>\n <legs>4</legs>\n <cute>true</cute>\n</cat>",
expression: " (.. | select(tag == \"!!str\")) |= from_yaml",
expected: "D0, P[], ()::cat:\n says: meow\n legs: 4\n cute: true\n",
},
{
description: "Parse xml: array",
subdescription: "Consecutive nodes with identical xml names are assumed to be arrays.",
input: "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<animal>1</animal>\n<animal>2</animal>",
expected: "D0, P[], (doc)::animal:\n - \"1\"\n - \"2\"\n",
input: "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<animal>cat</animal>\n<animal>goat</animal>",
expected: "D0, P[], (doc)::animal:\n - cat\n - goat\n",
},
{
description: "Parse xml: attributes",
@ -225,7 +255,7 @@ var xmlScenarios = []formatScenario{
},
{
description: "Parse xml: attributes with content",
subdescription: "Content is added as a field, using the default content name of '+content'. Use `--xml-content-name` to set your own.",
subdescription: "Content is added as a field, using the default content name of `+content`. Use `--xml-content-name` to set your own.",
input: "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<cat legs=\"4\">meow</cat>",
expected: "D0, P[], (doc)::cat:\n +content: meow\n +legs: \"4\"\n",
},
@ -302,7 +332,7 @@ func testXmlScenario(t *testing.T, s formatScenario) {
if s.scenarioType == "encode" || s.scenarioType == "roundtrip" {
test.AssertResultWithContext(t, s.expected, processXmlScenario(s), s.description)
} else {
var actual = resultToString(t, decodeXml(t, s.input))
var actual = resultToString(t, decodeXml(t, s))
test.AssertResultWithContext(t, s.expected, actual, s.description)
}
}
@ -335,13 +365,17 @@ func documentXmlDecodeScenario(t *testing.T, w *bufio.Writer, s formatScenario)
writeOrPanic(w, fmt.Sprintf("```xml\n%v\n```\n", s.input))
writeOrPanic(w, "then\n")
writeOrPanic(w, "```bash\nyq e -p=xml '.' sample.xml\n```\n")
expression := s.expression
if expression == "" {
expression = "."
}
writeOrPanic(w, fmt.Sprintf("```bash\nyq e -p=xml '%v' sample.xml\n```\n", expression))
writeOrPanic(w, "will output\n")
var output bytes.Buffer
printer := NewSimpleYamlPrinter(bufio.NewWriter(&output), YamlOutputFormat, true, false, 2, true)
node := decodeXml(t, s.input)
node := decodeXml(t, s)
err := printer.PrintResults(node.AsList())
if err != nil {