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https://issues.apache.org/jira/browse/GROOVY-12435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18121673#comment-18121673
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Eric Milles commented on GROOVY-12435:
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Looks like this is where the line number is determined:
https://github.com/antlr/antlr4/blob/7d5770395bb7b02eb56e7c62662cb1d7c08f42a3/runtime/Java/src/org/antlr/v4/runtime/atn/LexerATNSimulator.java#L735
> carriage-return only line ending does not increment line number
> ---------------------------------------------------------------
>
> Key: GROOVY-12435
> URL: https://issues.apache.org/jira/browse/GROOVY-12435
> Project: Groovy
> Issue Type: Bug
> Components: parser-antlr4
> Affects Versions: 3.0.25, 4.0.33, 5.1.3, 6.0.0
> Reporter: Eric Milles
> Priority: Major
> Attachments: LineEndings.groovy, image-2026-09-30-09-41-06-973.png
>
>
> [^LineEndings.groovy]I had a source file with mixed line endings that caused
> a lot of trouble with the editor. I traced this back to the parser's handling
> of line endings. It seems when a line ending is just a carriage-return (\r)
> the line number is not incremented.
> !image-2026-09-30-09-41-06-973.png!
> In this example, the import and script statement have lines 2 and 6
> respectively. They should be at lines 3 and 7 as can be seen by the line
> numbering in the editor's gutter. The antlr2 parser handled this case
> properly.
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