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Add string slicing support (#2639)

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* Initial plan

* Add string slicing support to yq

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* Fix sliceStringNode signature and fix test descriptions/expressions

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* Update pkg/yqlib/operator_slice.go

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* Fix array slice out-of-bounds panic with very negative indices

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* S2-S4: tighten lexer condition, fix doc header, add Unicode example

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* Fix spelling: multibyte -> multi-byte in Unicode test subdescription

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---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: mikefarah <1151925+mikefarah@users.noreply.github.com>
Co-authored-by: Mike Farah <mikefarah@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
This commit is contained in:
Copilot
2026-04-06 19:29:07 +10:00
committed by GitHub
co-authored by mikefarah Copilot copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Mike Farah
parent 68f0322ba3
commit 3b2423e871
7 changed files with 203 additions and 10 deletions
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pkg/yqlib/operator_slice.go
+25 -2
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@@ -31,6 +31,24 @@ func clampSliceIndex(index, length int) int {
return index
}
func sliceStringNode(lhsNode *CandidateNode, firstNumber int, secondNumber int) *CandidateNode {
runes := []rune(lhsNode.Value)
length := len(runes)
relativeFirstNumber := clampSliceIndex(firstNumber, length)
relativeSecondNumber := clampSliceIndex(secondNumber, length)
if relativeSecondNumber < relativeFirstNumber {
relativeSecondNumber = relativeFirstNumber
}
log.Debugf("sliceStringNode: slice from %v to %v", relativeFirstNumber, relativeSecondNumber)
slicedString := string(runes[relativeFirstNumber:relativeSecondNumber])
replacement := lhsNode.CreateReplacement(ScalarNode, lhsNode.Tag, slicedString)
replacement.Style = lhsNode.Style
return replacement
}
func sliceArrayOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
log.Debug("slice array operator!")
@@ -43,16 +61,21 @@ func sliceArrayOperator(d *dataTreeNavigator, context Context, expressionNode *E
lhsNode := el.Value.(*CandidateNode)
firstNumber, err := getSliceNumber(d, context, lhsNode, expressionNode.LHS)
if err != nil {
return Context{}, err
}
relativeFirstNumber := clampSliceIndex(firstNumber, len(lhsNode.Content))
secondNumber, err := getSliceNumber(d, context, lhsNode, expressionNode.RHS)
if err != nil {
return Context{}, err
}
if lhsNode.Kind == ScalarNode && lhsNode.guessTagFromCustomType() == "!!str" {
results.PushBack(sliceStringNode(lhsNode, firstNumber, secondNumber))
continue
}
relativeFirstNumber := clampSliceIndex(firstNumber, len(lhsNode.Content))
relativeSecondNumber := clampSliceIndex(secondNumber, len(lhsNode.Content))
log.Debugf("calculateIndicesToTraverse: slice from %v to %v", relativeFirstNumber, relativeSecondNumber)