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

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Co-authored-by: mikefarah <1151925+mikefarah@users.noreply.github.com>
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copilot-swe-agent[bot] 2026-04-06 08:45:00 +00:00 committed by GitHub
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3 changed files with 24 additions and 3 deletions
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2
pkg/yqlib/doc/operators/headers/slice-array.md
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@ -1,4 +1,4 @@
# Slice/Splice Array or String # Slice Array or String
The slice operator works on both arrays and strings. Like the `jq` equivalent, `.[10:15]` will return a subarray (or substring) of length 5, starting from index 10 inclusive, up to index 15 exclusive. Negative numbers count backwards from the end of the array or string. The slice operator works on both arrays and strings. Like the `jq` equivalent, `.[10:15]` will return a subarray (or substring) of length 5, starting from index 10 inclusive, up to index 15 exclusive. Negative numbers count backwards from the end of the array or string.

18
pkg/yqlib/doc/operators/slice-array.md
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@ -1,4 +1,4 @@
# Slice/Splice Array or String # Slice Array or String
The slice operator works on both arrays and strings. Like the `jq` equivalent, `.[10:15]` will return a subarray (or substring) of length 5, starting from index 10 inclusive, up to index 15 exclusive. Negative numbers count backwards from the end of the array or string. The slice operator works on both arrays and strings. Like the `jq` equivalent, `.[10:15]` will return a subarray (or substring) of length 5, starting from index 10 inclusive, up to index 15 exclusive. Negative numbers count backwards from the end of the array or string.
@ -165,3 +165,19 @@ will output
ralia ralia
``` ```
## Slicing strings - Unicode
Indices are rune-based, so multibyte characters are handled correctly
Given a sample.yml file of:
```yaml
greeting: héllo
```
then
```bash
yq '.greeting[1:3]' sample.yml
```
will output
```yaml
él
```

7
pkg/yqlib/lexer.go
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@ -127,10 +127,15 @@ func handleToken(tokens []*token, index int, postProcessedTokens []*token) (toke
if tokenIsOpType(currentToken, createMapOpType) { if tokenIsOpType(currentToken, createMapOpType) {
log.Debugf("tokenIsOpType: createMapOpType") log.Debugf("tokenIsOpType: createMapOpType")
// check the previous token is '[', means we are slice, but dont have a first number // check the previous token is '[', means we are slice, but dont have a first number
if index > 0 && (tokens[index-1].TokenType == traverseArrayCollect || tokens[index-1].TokenType == openCollect) { if index > 0 && tokens[index-1].TokenType == traverseArrayCollect {
log.Debugf("previous token is : traverseArrayOpType") log.Debugf("previous token is : traverseArrayOpType")
// need to put the number 0 before this token, as that is implied // need to put the number 0 before this token, as that is implied
postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: createValueOperation(0, "0")}) postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: createValueOperation(0, "0")})
} else if index >= 2 && tokens[index-1].TokenType == openCollect &&
(tokens[index-2].TokenType == operationToken || tokens[index-2].TokenType == closeCollect || tokens[index-2].TokenType == closeCollectObject) {
log.Debugf("previous token is : openCollect following a traversal, implying 0 start")
// need to put the number 0 before this token, as that is implied
postProcessedTokens = append(postProcessedTokens, &token{TokenType: operationToken, Operation: createValueOperation(0, "0")})
} }
} }