965b93bd2a
This allows us to run the tests via a library call rather than just as a command execution. And, it's a step toward a broader goal, which is to keep the code in the top-level src directory minimal, with important functionality exposed as crates.
28 lines
956 B
Rust
28 lines
956 B
Rust
/// Look for a directive in a comment string.
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/// The directive is of the form "foo:" and should follow the leading `;` in the comment:
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///
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/// ; dominates: ebb3 ebb4
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///
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/// Return the comment text following the directive.
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pub fn match_directive<'a>(comment: &'a str, directive: &str) -> Option<&'a str> {
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assert!(
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directive.ends_with(':'),
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"Directive must include trailing colon"
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);
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let text = comment.trim_left_matches(';').trim_left();
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if text.starts_with(directive) {
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Some(text[directive.len()..].trim())
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} else {
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None
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}
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}
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#[test]
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fn test_match_directive() {
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assert_eq!(match_directive("; foo: bar ", "foo:"), Some("bar"));
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assert_eq!(match_directive(" foo:bar", "foo:"), Some("bar"));
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assert_eq!(match_directive("foo:bar", "foo:"), Some("bar"));
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assert_eq!(match_directive(";x foo: bar", "foo:"), None);
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assert_eq!(match_directive(";;; foo: bar", "foo:"), Some("bar"));
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}
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