Bumping version

- improved comment handling
- yaml decoder now responsible for leading content work around

cmd/version.go

@@ -11,7 +11,7 @@ var (
 	GitDescribe string
 
 	// Version is main version number that is being run at the moment.
-	Version = "4.28.2"
+	Version = "4.29.2"
 
 	// 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/array.yaml

@@ -1,11 +1,2 @@
----
-- become: true
-  gather_facts: false
-  hosts: lalaland
-  name: "Apply smth"
-  roles:
-    - lala
-    - land
-  serial: 1
-- become: false
-  gather_facts: true
+- [cat, dog, frog, cow]
+- [apple, banana, grape, mango]

examples/sample_objects.csv

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

go.mod

@@ -8,11 +8,11 @@ require (
 	github.com/elliotchance/orderedmap v1.5.0
 	github.com/fatih/color v1.13.0
 	github.com/goccy/go-json v0.9.11
-	github.com/goccy/go-yaml v1.9.5
+	github.com/goccy/go-yaml v1.9.6
 	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 v1.6.0
+	github.com/spf13/cobra v1.6.1
 	golang.org/x/net v0.0.0-20220708220712-1185a9018129
 	gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473
 	gopkg.in/yaml.v3 v3.0.1

go.sum

@@ -21,8 +21,8 @@ github.com/go-playground/universal-translator v0.17.0/go.mod h1:UkSxE5sNxxRwHyU+
 github.com/go-playground/validator/v10 v10.4.1/go.mod h1:nlOn6nFhuKACm19sB/8EGNn9GlaMV7XkbRSipzJ0Ii4=
 github.com/goccy/go-json v0.9.11 h1:/pAaQDLHEoCq/5FFmSKBswWmK6H0e8g4159Kc/X/nqk=
 github.com/goccy/go-json v0.9.11/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
-github.com/goccy/go-yaml v1.9.5 h1:Eh/+3uk9kLxG4koCX6lRMAPS1OaMSAi+FJcya0INdB0=
-github.com/goccy/go-yaml v1.9.5/go.mod h1:U/jl18uSupI5rdI2jmuCswEA2htH9eXfferR3KfscvA=
+github.com/goccy/go-yaml v1.9.6 h1:KhAu1zf9JXnm3vbG49aDE0E5uEBUsM4uwD31/58ZWyI=
+github.com/goccy/go-yaml v1.9.6/go.mod h1:JubOolP3gh0HpiBc4BLRD4YmjEjHAmIIB2aaXKkTfoE=
 github.com/hexops/gotextdiff v1.0.3 h1:gitA9+qJrrTCsiCl7+kh75nPqQt1cx4ZkudSTLoUqJM=
 github.com/inconshreveable/mousetrap v1.0.1 h1:U3uMjPSQEBMNp1lFxmllqCPM6P5u/Xq7Pgzkat/bFNc=
 github.com/inconshreveable/mousetrap v1.0.1/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
@@ -43,8 +43,8 @@ github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e/go.mod h1:pJLUxLENpZxwdsK
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
-github.com/spf13/cobra v1.6.0 h1:42a0n6jwCot1pUmomAp4T7DeMD+20LFv4Q54pxLf2LI=
-github.com/spf13/cobra v1.6.0/go.mod h1:IOw/AERYS7UzyrGinqmz6HLUo219MORXGxhbaJUqzrY=
+github.com/spf13/cobra v1.6.1 h1:o94oiPyS4KD1mPy2fmcYYHHfCxLqYjJOhGsCHFZtEzA=
+github.com/spf13/cobra v1.6.1/go.mod h1:IOw/AERYS7UzyrGinqmz6HLUo219MORXGxhbaJUqzrY=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
@@ -62,6 +62,7 @@ golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220406163625-3f8b81556e12/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220712014510-0a85c31ab51e h1:NHvCuwuS43lGnYhten69ZWqi2QOj/CiDNcKbVqwVoew=
 golang.org/x/sys v0.0.0-20220712014510-0a85c31ab51e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

pkg/yqlib/csv_test.go

@@ -12,7 +12,9 @@ const csvSimple = `name,numberOfCats,likesApples,height
 Gary,1,true,168.8
 Samantha's Rabbit,2,false,-188.8
 `
-
+const csvMissing = `name,numberOfCats,likesApples,height
+,null,,168.8
+`
 const expectedUpdatedSimpleCsv = `name,numberOfCats,likesApples,height
 Gary,3,true,168.8
 Samantha's Rabbit,2,false,-188.8
@@ -110,6 +112,13 @@ var csvScenarios = []formatScenario{
 		expected:       csvSimpleMissingData,
 		scenarioType:   "encode-csv",
 	},
+	{
+		description:  "decode csv missing",
+		skipDoc:      true,
+		input:        csvMissing,
+		expected:     csvMissing,
+		scenarioType: "roundtrip-csv",
+	},
 	{
 		description:    "Parse CSV into an array of objects",
 		subdescription: "First row is assumed to be the header row.",

pkg/yqlib/doc/operators/headers/slice-array.md

@@ -0,0 +1,5 @@
+# Slice Array
+
+The slice array operator takes an array as input and returns a subarray. Like the `jq` equivalent, `.[10:15]` will return an array of length 5, starting from index 10 inclusive, up to index 15 exclusive. Negative numbers count backwards from the end of the array.
+
+You may leave out the first or second number, which will will refer to the start or end of the array respectively.

pkg/yqlib/doc/operators/slice-array.md

@@ -0,0 +1,82 @@
+# Slice Array
+
+The slice array operator takes an array as input and returns a subarray. Like the `jq` equivalent, `.[10:15]` will return an array of length 5, starting from index 10 inclusive, up to index 15 exclusive. Negative numbers count backwards from the end of the array.
+
+You may leave out the first or second number, which will will refer to the start or end of the array respectively.
+
+## Slicing arrays
+Given a sample.yml file of:
+```yaml
+- cat
+- dog
+- frog
+- cow
+```
+then
+```bash
+yq '.[1:3]' sample.yml
+```
+will output
+```yaml
+- dog
+- frog
+```
+
+## Slicing arrays - without the first number
+Starts from the start of the array
+
+Given a sample.yml file of:
+```yaml
+- cat
+- dog
+- frog
+- cow
+```
+then
+```bash
+yq '.[:2]' sample.yml
+```
+will output
+```yaml
+- cat
+- dog
+```
+
+## Slicing arrays - without the second number
+Finishes at the end of the array
+
+Given a sample.yml file of:
+```yaml
+- cat
+- dog
+- frog
+- cow
+```
+then
+```bash
+yq '.[2:]' sample.yml
+```
+will output
+```yaml
+- frog
+- cow
+```
+
+## Slicing arrays - use negative numbers to count backwards from the end
+Given a sample.yml file of:
+```yaml
+- cat
+- dog
+- frog
+- cow
+```
+then
+```bash
+yq '.[1:-1]' sample.yml
+```
+will output
+```yaml
+- dog
+- frog
+```
+

pkg/yqlib/lexer.go

@@ -3,7 +3,6 @@ package yqlib
 import (
 	"fmt"
 	"regexp"
-	"strconv"
 )
 
 type expressionTokeniser interface {
@@ -64,11 +63,11 @@ func unwrap(value string) string {
 func extractNumberParameter(value string) (int, error) {
 	parameterParser := regexp.MustCompile(`.*\(([0-9]+)\)`)
 	matches := parameterParser.FindStringSubmatch(value)
-	var indent, errParsingInt = strconv.ParseInt(matches[1], 10, 32)
+	var indent, errParsingInt = parseInt(matches[1])
 	if errParsingInt != nil {
 		return 0, errParsingInt
 	}
-	return int(indent), nil
+	return indent, nil
 }
 
 func hasOptionParameter(value string, option string) bool {

pkg/yqlib/lexer_participle.go

@@ -1,6 +1,7 @@
 package yqlib
 
 import (
+	"regexp"
 	"strconv"
 	"strings"
 
@@ -12,6 +13,10 @@ var participleYqRules = []*participleYqRule{
 	{"HEAD_COMMENT", `head_?comment|headComment`, opTokenWithPrefs(getCommentOpType, assignCommentOpType, commentOpPreferences{HeadComment: true}), 0},
 	{"FOOT_COMMENT", `foot_?comment|footComment`, opTokenWithPrefs(getCommentOpType, assignCommentOpType, commentOpPreferences{FootComment: true}), 0},
 
+	{"SliceArray", `\.\[-?[0-9]+:-?[0-9]+\]`, sliceArrayTwoNumbers(), 0},
+	{"SliceArraySecond", `\.\[\:-?[0-9]+\]`, sliceArraySecondNumberOnly(), 0},
+	{"SliceArrayFirst", `\.\[-?[0-9]+\:\]`, sliceArrayFirstNumberOnly(), 0},
+
 	{"OpenBracket", `\(`, literalToken(openBracket, false), 0},
 	{"CloseBracket", `\)`, literalToken(closeBracket, true), 0},
 	{"OpenTraverseArrayCollect", `\.\[`, literalToken(traverseArrayCollect, false), 0},
@@ -300,6 +305,84 @@ func flattenWithDepth() yqAction {
 	}
 }
 
+func sliceArrayTwoNumbers() yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		value := rawToken.Value
+		sliceArrayNumbers := regexp.MustCompile(`\.\[(-?[0-9]+)\:(-?[0-9]+)\]`)
+		matches := sliceArrayNumbers.FindStringSubmatch(value)
+		log.Debug("sliceArrayTwoNumbers value: %v", value)
+		log.Debug("Matches: %v", matches)
+
+		firstNumber, err := parseInt(matches[1])
+		if err != nil {
+			return nil, err
+		}
+		secondNumber, err := parseInt(matches[2])
+		if err != nil {
+			return nil, err
+		}
+
+		prefs := sliceArrayPreferences{
+			firstNumber:         firstNumber,
+			secondNumber:        secondNumber,
+			secondNumberDefined: true,
+		}
+		log.Debug("%v", prefs)
+
+		op := &Operation{OperationType: sliceArrayOpType, Value: sliceArrayOpType.Type, StringValue: value, Preferences: prefs}
+		return &token{TokenType: operationToken, Operation: op}, nil
+	}
+}
+
+func sliceArraySecondNumberOnly() yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		value := rawToken.Value
+		sliceArrayNumbers := regexp.MustCompile(`\.\[\:(-?[0-9]+)\]`)
+		matches := sliceArrayNumbers.FindStringSubmatch(value)
+		log.Debug("sliceArraySecondNumberOnly value: %v", value)
+		log.Debug("Matches: %v", matches)
+
+		secondNumber, err := parseInt(matches[1])
+		if err != nil {
+			return nil, err
+		}
+
+		prefs := sliceArrayPreferences{
+			firstNumber:         0,
+			secondNumber:        secondNumber,
+			secondNumberDefined: true,
+		}
+		log.Debug("%v", prefs)
+
+		op := &Operation{OperationType: sliceArrayOpType, Value: sliceArrayOpType.Type, StringValue: value, Preferences: prefs}
+		return &token{TokenType: operationToken, Operation: op}, nil
+	}
+}
+
+func sliceArrayFirstNumberOnly() yqAction {
+	return func(rawToken lexer.Token) (*token, error) {
+		value := rawToken.Value
+		sliceArrayNumbers := regexp.MustCompile(`\.\[(-?[0-9]+)\:\]`)
+		matches := sliceArrayNumbers.FindStringSubmatch(value)
+		log.Debug("sliceArrayFirstNumberOnly value: %v", value)
+		log.Debug("Matches: %v", matches)
+
+		firstNumber, err := parseInt(matches[1])
+		if err != nil {
+			return nil, err
+		}
+
+		prefs := sliceArrayPreferences{
+			firstNumber:         firstNumber,
+			secondNumberDefined: false,
+		}
+		log.Debug("%v", prefs)
+
+		op := &Operation{OperationType: sliceArrayOpType, Value: sliceArrayOpType.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)

pkg/yqlib/lexer_participle_test.go

@@ -14,6 +14,62 @@ type participleLexerScenario struct {
 }
 
 var participleLexerScenarios = []participleLexerScenario{
+	{
+		expression: ".[1:3]",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: sliceArrayOpType,
+					Value:         "SLICE",
+					StringValue:   ".[1:3]",
+					Preferences:   sliceArrayPreferences{firstNumber: 1, secondNumber: 3, secondNumberDefined: true},
+				},
+			},
+		},
+	},
+	{
+		expression: ".[:3]",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: sliceArrayOpType,
+					Value:         "SLICE",
+					StringValue:   ".[:3]",
+					Preferences:   sliceArrayPreferences{firstNumber: 0, secondNumber: 3, secondNumberDefined: true},
+				},
+			},
+		},
+	},
+	{
+		expression: ".[1:]",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: sliceArrayOpType,
+					Value:         "SLICE",
+					StringValue:   ".[1:]",
+					Preferences:   sliceArrayPreferences{firstNumber: 1, secondNumber: 0, secondNumberDefined: false},
+				},
+			},
+		},
+	},
+	{
+		expression: ".[-100:-54]",
+		tokens: []*token{
+			{
+				TokenType: operationToken,
+				Operation: &Operation{
+					OperationType: sliceArrayOpType,
+					Value:         "SLICE",
+					StringValue:   ".[-100:-54]",
+					Preferences:   sliceArrayPreferences{firstNumber: -100, secondNumber: -54, secondNumberDefined: true},
+				},
+			},
+		},
+	},
 	{
 		expression: ".a",
 		tokens: []*token{

pkg/yqlib/lib.go

@@ -81,6 +81,7 @@ var lineOpType = &operationType{Type: "LINE", NumArgs: 0, Precedence: 50, Handle
 var columnOpType = &operationType{Type: "LINE", NumArgs: 0, Precedence: 50, Handler: columnOperator}
 
 var collectOpType = &operationType{Type: "COLLECT", NumArgs: 1, Precedence: 50, Handler: collectOperator}
+var sliceArrayOpType = &operationType{Type: "SLICE", NumArgs: 0, Precedence: 50, Handler: sliceArrayOperator}
 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}
@@ -248,6 +249,12 @@ func guessTagFromCustomType(node *yaml.Node) string {
 }
 
 func parseSnippet(value string) (*yaml.Node, error) {
+	if value == "" {
+		return &yaml.Node{
+			Kind: yaml.ScalarNode,
+			Tag:  "!!null",
+		}, nil
+	}
 	decoder := NewYamlDecoder(ConfiguredYamlPreferences)
 	err := decoder.Init(strings.NewReader(value))
 	if err != nil {
@@ -352,8 +359,8 @@ func parseInt(numberString string) (int, error) {
 
 	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)
+	} else if parsed > math.MaxInt || parsed < math.MinInt {
+		return 0, fmt.Errorf("%v is not within [%v, %v]", parsed, math.MinInt, math.MaxInt)
 	}
 
 	return int(parsed), err

pkg/yqlib/lib_test.go

@@ -1,6 +1,11 @@
 package yqlib
 
-import "testing"
+import (
+	"testing"
+
+	"github.com/mikefarah/yq/v4/test"
+	yaml "gopkg.in/yaml.v3"
+)
 
 func TestGetLogger(t *testing.T) {
 	l := GetLogger()
@@ -8,3 +13,69 @@ func TestGetLogger(t *testing.T) {
 		t.Fatal("GetLogger should return the yq logger instance, not a copy")
 	}
 }
+
+type parseSnippetScenario struct {
+	snippet  string
+	expected *yaml.Node
+}
+
+var parseSnippetScenarios = []parseSnippetScenario{
+	{
+		snippet: "",
+		expected: &yaml.Node{
+			Kind: yaml.ScalarNode,
+			Tag:  "!!null",
+		},
+	},
+	{
+		snippet: "3",
+		expected: &yaml.Node{
+			Kind:   yaml.ScalarNode,
+			Tag:    "!!int",
+			Value:  "3",
+			Line:   1,
+			Column: 1,
+		},
+	},
+	{
+		snippet: "cat",
+		expected: &yaml.Node{
+			Kind:   yaml.ScalarNode,
+			Tag:    "!!str",
+			Value:  "cat",
+			Line:   1,
+			Column: 1,
+		},
+	},
+	{
+		snippet: "3.1",
+		expected: &yaml.Node{
+			Kind:   yaml.ScalarNode,
+			Tag:    "!!float",
+			Value:  "3.1",
+			Line:   1,
+			Column: 1,
+		},
+	},
+	{
+		snippet: "true",
+		expected: &yaml.Node{
+			Kind:   yaml.ScalarNode,
+			Tag:    "!!bool",
+			Value:  "true",
+			Line:   1,
+			Column: 1,
+		},
+	},
+}
+
+func TestParseSnippet(t *testing.T) {
+	for _, tt := range parseSnippetScenarios {
+		actual, err := parseSnippet(tt.snippet)
+		if err != nil {
+			t.Error(tt.snippet)
+			t.Error(err)
+		}
+		test.AssertResultComplexWithContext(t, tt.expected, actual, tt.snippet)
+	}
+}

pkg/yqlib/operator_slice.go

@@ -0,0 +1,63 @@
+package yqlib
+
+import (
+	"container/list"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+type sliceArrayPreferences struct {
+	firstNumber         int
+	secondNumber        int
+	secondNumberDefined bool
+}
+
+func sliceArrayOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
+
+	lhs, err := d.GetMatchingNodes(context, expressionNode.LHS)
+	if err != nil {
+		return Context{}, err
+	}
+	prefs := expressionNode.Operation.Preferences.(sliceArrayPreferences)
+	firstNumber := prefs.firstNumber
+	secondNumber := prefs.secondNumber
+
+	results := list.New()
+
+	for el := lhs.MatchingNodes.Front(); el != nil; el = el.Next() {
+		lhsNode := el.Value.(*CandidateNode)
+		original := unwrapDoc(lhsNode.Node)
+
+		relativeFirstNumber := firstNumber
+		if relativeFirstNumber < 0 {
+			relativeFirstNumber = len(original.Content) + firstNumber
+		}
+
+		relativeSecondNumber := len(original.Content)
+		if prefs.secondNumberDefined {
+			relativeSecondNumber = secondNumber
+			if relativeSecondNumber < 0 {
+				relativeSecondNumber = len(original.Content) + secondNumber
+			}
+		}
+
+		log.Debug("calculateIndicesToTraverse: slice from %v to %v", relativeFirstNumber, relativeSecondNumber)
+
+		var newResults []*yaml.Node
+		for i := relativeFirstNumber; i < relativeSecondNumber; i++ {
+			newResults = append(newResults, original.Content[i])
+		}
+
+		slicedArrayNode := &yaml.Node{
+			Kind:    yaml.SequenceNode,
+			Tag:     original.Tag,
+			Content: newResults,
+		}
+		results.PushBack(lhsNode.CreateReplacement(slicedArrayNode))
+
+	}
+
+	// result is now the context that has the nodes we need to put back into a sequence.
+	//what about multiple arrays in the context? I think we need to create an array for each one
+	return context.ChildContext(results), nil
+}

pkg/yqlib/operator_slice_test.go

@@ -0,0 +1,81 @@
+package yqlib
+
+import "testing"
+
+var sliceArrayScenarios = []expressionScenario{
+	{
+		description: "Slicing arrays",
+		document:    `[cat, dog, frog, cow]`,
+		expression:  `.[1:3]`,
+		expected: []string{
+			"D0, P[], (!!seq)::- dog\n- frog\n",
+		},
+	},
+	{
+		description:    "Slicing arrays - without the first number",
+		subdescription: "Starts from the start of the array",
+		document:       `[cat, dog, frog, cow]`,
+		expression:     `.[:2]`,
+		expected: []string{
+			"D0, P[], (!!seq)::- cat\n- dog\n",
+		},
+	},
+	{
+		description:    "Slicing arrays - without the second number",
+		subdescription: "Finishes at the end of the array",
+		document:       `[cat, dog, frog, cow]`,
+		expression:     `.[2:]`,
+		expected: []string{
+			"D0, P[], (!!seq)::- frog\n- cow\n",
+		},
+	},
+	{
+		description: "Slicing arrays - use negative numbers to count backwards from the end",
+		document:    `[cat, dog, frog, cow]`,
+		expression:  `.[1:-1]`,
+		expected: []string{
+			"D0, P[], (!!seq)::- dog\n- frog\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `[[cat, dog, frog, cow], [apple, banana, grape, mango]]`,
+		expression: `.[] | .[1:3]`,
+		expected: []string{
+			"D0, P[0], (!!seq)::- dog\n- frog\n",
+			"D0, P[1], (!!seq)::- banana\n- grape\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `[[cat, dog, frog, cow], [apple, banana, grape, mango]]`,
+		expression: `.[] | .[-2:-1]`,
+		expected: []string{
+			"D0, P[0], (!!seq)::- frog\n",
+			"D0, P[1], (!!seq)::- grape\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `[cat1, cat2, cat3, cat4, cat5, cat6, cat7, cat8, cat9, cat10, cat11]`,
+		expression: `.[10:11]`,
+		expected: []string{
+			"D0, P[], (!!seq)::- cat11\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   `[cat1, cat2, cat3, cat4, cat5, cat6, cat7, cat8, cat9, cat10, cat11]`,
+		expression: `.[-11:-10]`,
+		expected: []string{
+			"D0, P[], (!!seq)::- cat1\n",
+		},
+	},
+}
+
+func TestSliceOperatorScenarios(t *testing.T) {
+	for _, tt := range sliceArrayScenarios {
+		testScenario(t, &tt)
+	}
+	documentOperatorScenarios(t, "slice-array", sliceArrayScenarios)
+}

pkg/yqlib/operator_traverse_path.go

@@ -76,7 +76,6 @@ func traverse(context Context, matchingNode *CandidateNode, operation *Operation
 }
 
 func traverseArrayOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
-
 	//lhs may update the variable context, we should pass that into the RHS
 	// BUT we still return the original context back (see jq)
 	// https://stedolan.github.io/jq/manual/#Variable/SymbolicBindingOperator:...as$identifier|...

release_notes.txt

@@ -1,7 +1,15 @@
+4.29.2:
+  - Fixed null pointer exception when parsing CSV with empty field #1404
+
 4.29.1:
   - Fixed Square brackets removing update #1342
+  - Added slice array operator (.[10:15]) #44
   - XML decoder/encoder now parses directives and proc instructions (#1344). Please use the new skip flags [documented here](https://mikefarah.gitbook.io/yq/usage/xml) to ignore them.
+  - XML users note that the default attribute prefix will change to `+@` in the 4.30 release to avoid naming conflicts!
+  - Improved comment handling of decoders (breaking change for yqlib users sorry)
+  - Fixed load operator bug when loading yaml file with multiple documents
   - Bumped Go compiler version
+  - Bumped dependencies
 
 4.28.2:
   - Fixed Github Actions issues (thanks @mattphelps-8451)

snap/snapcraft.yaml

@@ -1,5 +1,5 @@
 name: yq
-version: '4.28.2'
+version: '4.29.2'
 summary: A lightweight and portable command-line YAML processor
 description: |
   The aim of the project is to be the jq or sed of yaml files.