Mercurial > lbo > hg > rcombinators
view src/parser.rs @ 1:0ad857b005ae
Implement Int parser
author | Lewin Bormann <lewin@lewin-bormann.info> |
---|---|
date | Wed, 29 May 2019 23:49:47 +0200 |
parents | 6286f0ed89a7 |
children | 7873119002f7 |
line wrap: on
line source
use std::fmt; use crate::state::ParseState; #[derive(Debug, PartialEq)] pub enum ParseError { EOF, Fail(&'static str, usize), } impl fmt::Display for ParseError { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { match self { ParseError::EOF => f.write_str("EOF"), ParseError::Fail(s, pos) => write!(f, "Parse fail: {} at {}", s, pos), } } } pub type ParseResult<R> = Result<R, ParseError>; pub trait Parser { type Result; fn parse( &mut self, st: &mut ParseState<impl Iterator<Item = char>>, ) -> ParseResult<Self::Result>; }