Mercurial > lbo > hg > rcombinators
view src/parser.rs @ 0:6286f0ed89a7
Initial commit
author | Lewin Bormann <lewin@lewin-bormann.info> |
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date | Wed, 29 May 2019 23:32:37 +0200 |
parents | |
children | 0ad857b005ae |
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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>; }