Flatten the parse logic in line_directive
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99fb653d1d
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@ -650,27 +650,22 @@ pub fn local_pass_mode(&self) -> Option<PassMode> {
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/// See [`HeaderLine`] for a diagram.
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pub fn line_directive<'line>(
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comment: &str,
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ln: &'line str,
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original_line: &'line str,
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) -> Option<(Option<&'line str>, &'line str)> {
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let ln = ln.trim_start();
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if ln.starts_with(comment) {
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let ln = ln[comment.len()..].trim_start();
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if ln.starts_with('[') {
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// A comment like `//[foo]` is specific to revision `foo`
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let Some(close_brace) = ln.find(']') else {
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// Ignore lines that don't start with the comment prefix.
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let after_comment = original_line.trim_start().strip_prefix(comment)?.trim_start();
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if let Some(after_open_bracket) = after_comment.strip_prefix('[') {
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// A comment like `//@[foo]` only applies to revision `foo`.
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let Some((line_revision, directive)) = after_open_bracket.split_once(']') else {
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panic!(
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"malformed condition directive: expected `{}[foo]`, found `{}`",
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comment, ln
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);
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"malformed condition directive: expected `{comment}[foo]`, found `{original_line}`"
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)
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};
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let line_revision = &ln[1..close_brace];
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Some((Some(line_revision), ln[(close_brace + 1)..].trim_start()))
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Some((Some(line_revision), directive.trim_start()))
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} else {
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Some((None, ln))
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}
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} else {
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None
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Some((None, after_comment))
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}
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}
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