rusty_peg/
lib.rs

1#![crate_type="rlib"]
2#![allow(dead_code)] // for now
3
4extern crate regex;
5
6use std::collections::HashMap;
7
8#[derive(Copy,Clone)]
9pub struct Input<'a> {
10    pub text: &'a str,
11    pub offset: usize,
12}
13
14pub trait Symbol<'input, G> {
15    type Output;
16
17    fn pretty_print(&self) -> String;
18
19    fn parse_complete(&self, grammar: &mut G, text: &'input str)
20                      -> Result<Self::Output, Error<'input>>
21    {
22        let (mid, result) = try!(self.parse_prefix(grammar, text));
23        let end = util::skip_whitespace(mid);
24        if end.offset == text.len() {
25            Ok(result)
26        } else {
27            Err(Error { expected: "end of input",
28                        offset: end.offset })
29        }
30    }
31
32    fn parse_prefix(&self, grammar: &mut G, text: &'input str)
33                     -> ParseResult<'input,Self::Output>
34    {
35        let input = Input { text: text, offset: 0 };
36        self.parse(grammar, input)
37    }
38
39    fn parse(&self, grammar: &mut G, input: Input<'input>)
40                 -> ParseResult<'input,Self::Output>;
41}
42
43pub type Cache<'input,T> = HashMap<usize, ParseResult<'input,T>>;
44
45pub type ParseResult<'input,O> = Result<(Input<'input>, O), Error<'input>>;
46
47pub enum Kind<NT> {
48    Text,
49    Option,
50    Repeat,
51    Elem,
52    Group,
53    Symbol(NT)
54}
55
56#[derive(Clone, Debug)]
57pub struct Error<'input> {
58    pub expected: &'input str,
59    pub offset: usize
60}
61
62#[macro_use]
63pub mod macros;
64pub mod util;
65pub mod tree;
66
67impl<'input> Input<'input> {
68    fn offset_by(&self, amount: usize) -> Input<'input> {
69        Input { text: self.text, offset: self.offset + amount }
70    }
71}
72
73#[cfg(test)]
74mod test;
rusty_peg/lib.rs

rusty_peg/
lib.rs
