Function item_match

std/re/src/main/matcher.rs:272–283

Predefined class predicates lean on std, so Unicode needs no tables. */

(item: &ClassItem, c: char)

/* Predefined class predicates lean on std, so Unicode needs no tables. */
fn item_match(item: &ClassItem, c: char) -> bool {
    match item {
        ClassItem::Ch(x) => c == *x,
        ClassItem::Range(lo, hi) => *lo <= c && c <= *hi,
        ClassItem::Digit => c.is_numeric(),
        ClassItem::NotDigit => !c.is_numeric(),
        ClassItem::Word => is_word(c),
        ClassItem::NotWord => !is_word(c),
        ClassItem::Space => c.is_whitespace(),
        ClassItem::NotSpace => !c.is_whitespace(),
    }
}

fn class_contains(items: &[ClassItem], c: char) -> bool {
    items.iter().any(|it| item_match(it, c))