Mercurial > lbo > hg > rcombinators
view src/parser.rs @ 6:7873119002f7
Implement Transform combinator.
author | Lewin Bormann <lewin@lewin-bormann.info> |
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date | Thu, 30 May 2019 14:27:11 +0200 |
parents | 0ad857b005ae |
children | 11802adb59ae |
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use std::fmt; use crate::state::ParseState; #[derive(Debug, PartialEq)] pub enum ParseError { EOF, Fail(&'static str, usize), /// Error during application of Transform. TransformFail(&'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), ParseError::TransformFail(s, pos) => write!(f, "Transform 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>; }