Method flag_state

regex/regex-syntax/src/ast/mod.rs:1302–1316

Returns the state of the given flag in this set. If the given flag is in the set but is negated, then `Some(false)` is returned. If the given flag is in the set and is not negated, then `Some(true)` is returned. Otherwise, `None` is returned.

(&self, flag: Flag)

    ///
    /// Otherwise, `None` is returned.
    pub fn flag_state(&self, flag: Flag) -> Option<bool> {
        let mut negated = false;
        for x in &self.items {
            match x.kind {
                FlagsItemKind::Negation => {
                    negated = true;
                }
                FlagsItemKind::Flag(ref xflag) if xflag == &flag => {
                    return Some(!negated);
                }
                _ => {}
            }
        }
        None
    }
}

/// A single item in a group of flags.