lrlex/
defaults.rs

1use std::{cmp, error::Error, fmt, hash::Hash, marker};
2
3use cfgrammar::Span;
4use lrpar::{Lexeme, LexerTypes};
5use num_traits::{AsPrimitive, PrimInt, Unsigned};
6
7use crate::LRLexError;
8
9/// lrlex's standard [LexerTypes] `struct`, provided as a convenience.
10#[derive(Debug)]
11pub struct DefaultLexerTypes<T = u32>
12where
13    T: 'static + fmt::Debug + Hash + PrimInt + Unsigned,
14    usize: AsPrimitive<T>,
15{
16    phantom: std::marker::PhantomData<T>,
17}
18
19impl<T> LexerTypes for DefaultLexerTypes<T>
20where
21    usize: AsPrimitive<T>,
22    T: 'static + fmt::Debug + Hash + PrimInt + Unsigned,
23{
24    type LexemeT = DefaultLexeme<T>;
25    type StorageT = T;
26    type LexErrorT = LRLexError;
27}
28
29/// lrlex's standard lexeme struct, provided as a convenience.
30#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
31pub struct DefaultLexeme<StorageT: fmt::Debug = u32> {
32    start: usize,
33    len: usize,
34    faulty: bool,
35    tok_id: StorageT,
36}
37
38impl<StorageT: Copy + fmt::Debug + Hash + cmp::Eq> Lexeme<StorageT> for DefaultLexeme<StorageT> {
39    fn new(tok_id: StorageT, start: usize, len: usize) -> Self {
40        DefaultLexeme {
41            start,
42            len,
43            faulty: false,
44            tok_id,
45        }
46    }
47
48    fn new_faulty(tok_id: StorageT, start: usize, len: usize) -> Self {
49        DefaultLexeme {
50            start,
51            len,
52            faulty: true,
53            tok_id,
54        }
55    }
56
57    fn tok_id(&self) -> StorageT {
58        self.tok_id
59    }
60
61    fn span(&self) -> Span {
62        Span::new(self.start, self.start + self.len)
63    }
64
65    fn faulty(&self) -> bool {
66        self.faulty
67    }
68}
69
70impl<StorageT: Copy + fmt::Debug + cmp::Eq + Hash + marker::Copy> fmt::Display
71    for DefaultLexeme<StorageT>
72{
73    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
74        write!(
75            f,
76            "DefaultLexeme[{}..{}]",
77            self.span().start(),
78            self.span().end()
79        )
80    }
81}
82
83impl<StorageT: Copy + fmt::Debug + cmp::Eq + Hash + marker::Copy> Error
84    for DefaultLexeme<StorageT>
85{
86}
lrlex/defaults.rs

lrlex/
defaults.rs
