Function extract_class_name_backward

src/completion/named_args.rs:353–364

Extract a class name (possibly namespace-qualified) before `::`. `colon_pos` points to the first `:` of `::`.

(chars: &[char], colon_pos: usize)

///
/// `colon_pos` points to the first `:` of `::`.
pub fn extract_class_name_backward(chars: &[char], colon_pos: usize) -> String {
    let mut i = colon_pos;
    // Skip whitespace
    while i > 0 && chars[i - 1] == ' ' {
        i -= 1;
    }
    let end = i;
    while i > 0 && (chars[i - 1].is_alphanumeric() || chars[i - 1] == '_' || chars[i - 1] == '\\') {
        i -= 1;
    }
    chars[i..end].iter().collect()
}

/// Parse the arguments text between `(` and the cursor to determine:
/// - Which parameter names have already been used as named arguments