lite_parser/
impls.rs

1use crate::traits::{Error, Position};
2
3#[cfg(not(feature = "std"))]
4extern crate alloc;
5
6#[cfg(not(feature = "std"))]
7use alloc::fmt::Formatter;
8#[cfg(not(feature = "std"))]
9use alloc::vec::Vec;
10
11#[cfg_attr(feature = "std", derive(Debug))]
12#[derive(Copy, Clone, Default, PartialEq, Eq)]
13pub struct SimplePosition {
14    pub index: u32,
15    pub line: u32,
16    pub column: u32,
17}
18
19impl SimplePosition {
20    pub fn next(&self, c: char) -> Self {
21        let new_line = c == '\n';
22        Self {
23            index: self.index + 1,
24            line: if new_line { self.line + 1 } else { self.line },
25            column: if new_line { 0 } else { self.column + 1 },
26        }
27    }
28}
29
30impl Position for SimplePosition {
31    fn index(&self) -> u32 {
32        self.index
33    }
34
35    fn line(&self) -> u32 {
36        self.line
37    }
38
39    fn column(&self) -> u32 {
40        self.column
41    }
42}
43
44impl core::ops::Sub<Self> for SimplePosition {
45    type Output = i32;
46
47    fn sub(self, rhs: SimplePosition) -> Self::Output {
48        if self.index > rhs.index {
49            (self.index - rhs.index) as i32
50        } else {
51            -((rhs.index - self.index) as i32)
52        }
53    }
54}
55
56#[cfg_attr(feature = "std", derive(Debug, PartialEq, Eq))]
57pub struct SimpleError {
58    pub reasons: Vec<(SimplePosition, &'static str)>,
59}
60
61#[cfg(not(feature = "std"))]
62impl core::fmt::Debug for SimpleError {
63    fn fmt(&self, _f: &mut Formatter<'_>) -> core::fmt::Result {
64        Ok(())
65    }
66}
67
68impl Error for SimpleError {
69    type Position = SimplePosition;
70
71    fn reasons(&self) -> &[(Self::Position, &'static str)] {
72        &self.reasons[..]
73    }
74
75    fn add_reason(self, position: Self::Position, reason: &'static str) -> Self {
76        let mut reasons = self.reasons;
77        reasons.push((position, reason));
78        Self { reasons }
79    }
80}
lite_parser/impls.rs

lite_parser/
impls.rs
