prism_parser/core/
pos.rs

1use crate::core::span::Span;
2use serde::{Deserialize, Serialize};
3use std::fmt::{Display, Formatter};
4use std::ops::Sub;
5
6#[derive(Copy, Clone, Hash, Ord, PartialOrd, Eq, PartialEq, Debug, Serialize, Deserialize)]
7pub struct Pos(usize);
8
9impl Pos {
10    pub fn start() -> Self {
11        Self(0)
12    }
13
14    pub fn end(input: &str) -> Self {
15        Self(input.len())
16    }
17
18    pub fn span_to(self, other: Self) -> Span {
19        Span::new(self, other)
20    }
21
22    pub fn next(self, input: &str) -> (Self, Option<(Span, char)>) {
23        match input[self.0..].chars().next() {
24            None => (self, None),
25            Some(c) => (
26                Self(self.0 + c.len_utf8()),
27                Some((Span::new(self, Self(self.0 + c.len_utf8())), c)),
28            ),
29        }
30    }
31
32    pub const fn invalid() -> Self {
33        Self(usize::MAX)
34    }
35}
36
37impl Display for Pos {
38    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
39        write!(f, "{}", self.0)
40    }
41}
42
43impl Sub<Pos> for Pos {
44    type Output = usize;
45
46    fn sub(self, rhs: Pos) -> Self::Output {
47        self.0 - rhs.0
48    }
49}
50
51impl From<Pos> for usize {
52    fn from(val: Pos) -> Self {
53        val.0
54    }
55}
prism_parser/core/pos.rs

prism_parser/core/
pos.rs
