Function find_identical_occurrences

src/util.rs:1946–1980

Find all occurrences of `needle` in `content` within the byte range `[scope_start, scope_end)` that are textually identical to the selected expression, excluding the original selection `[sel_start, sel_end)`. Returns `(start, end)` byte offset pairs. Word boundaries are checked so that substrings of longer identifiers are not matched.

(
    content: &str,
    needle: &str,
    sel_start: usize,
    sel_end: usize,
    scope_start: usize,
    scope_end: usize,
)

/// Returns `(start, end)` byte offset pairs. Word boundaries are checked
/// so that substrings of longer identifiers are not matched.
pub(crate) fn find_identical_occurrences(
    content: &str,
    needle: &str,
    sel_start: usize,
    sel_end: usize,
    scope_start: usize,
    scope_end: usize,
) -> Vec<(usize, usize)> {
    if needle.is_empty() || scope_start >= scope_end || scope_end > content.len() {
        return Vec::new();
    }
    let haystack = &content[scope_start..scope_end];
    let mut results = Vec::new();
    let mut search_from = 0;
    while let Some(pos) = haystack[search_from..].find(needle) {
        let abs_start = scope_start + search_from + pos;
        let abs_end = abs_start + needle.len();
        // Skip the original selection.
        if abs_start != sel_start || abs_end != sel_end {
            // Check word boundaries to avoid matching substrings.
            let before_ok = abs_start == 0
                || !content.as_bytes()[abs_start - 1].is_ascii_alphanumeric()
                    && content.as_bytes()[abs_start - 1] != b'_'
                    && content.as_bytes()[abs_start - 1] != b'$';
            let after_ok = abs_end >= content.len()
                || !content.as_bytes()[abs_end].is_ascii_alphanumeric()
                    && content.as_bytes()[abs_end] != b'_';
            if before_ok && after_ok {
                results.push((abs_start, abs_end));
            }
        }
        search_from = search_from + pos + 1;
    }
    results
}

/// Infer a [`PhpType`] from a literal expression string.
///