Function match_directive

cranelift/filetests/src/match_directive.rs:7–14

Look for a directive in a comment string. The directive is of the form "foo:" and should follow the leading `;` in the comment: ; dominates: block3 block4 Return the comment text following the directive.

(comment: &'a str, directive: &str)

///
/// Return the comment text following the directive.
pub fn match_directive<'a>(comment: &'a str, directive: &str) -> Option<&'a str> {
    assert!(
        directive.ends_with(':'),
        "Directive must include trailing colon"
    );
    let text = comment.trim_start_matches(';').trim_start();
    text.strip_prefix(directive).map(|s| s.trim())
}

#[test]
fn test_match_directive() {