use range::Range;
use std::rc::Rc;
use {
ret_err,
update,
DebugId,
ParseResult,
Rule,
Tokenizer,
TokenizerState,
};
#[derive(Clone)]
pub struct Sequence {
pub args: Vec<Rule>,
pub debug_id: DebugId,
}
impl Sequence {
pub fn parse(
&self,
tokenizer: &mut Tokenizer,
state: &TokenizerState,
mut chars: &[char],
start_offset: usize,
refs: &[(Rc<String>, Rule)]
) -> ParseResult<TokenizerState> {
let mut offset = start_offset;
let mut state = state.clone();
let mut opt_error = None;
for sub_rule in &self.args {
state = match sub_rule.parse(
tokenizer, &state, chars, offset, refs
) {
Ok((range, state, err)) => {
update(range, err, &mut chars, &mut offset, &mut opt_error);
state
}
Err(err) => {
return Err(ret_err(err, opt_error));
}
}
}
Ok((Range::new(start_offset, offset - start_offset), state, opt_error))
}
}