1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39

use crate::Token;
use crate::TokenType;

use logos::Logos;
use std::convert::TryFrom;
use std::ops::Range;
use text_size::{TextRange, TextSize};

pub struct Lexer<'l> {
    inner: logos::Lexer<'l, TokenType<'l>>,
}

impl<'l> Lexer<'l> {
    pub fn new(source: &'l str) -> Self {
        Self {
            inner: TokenType::lexer(source),
        }
    }
}

impl<'l> Iterator for Lexer<'l> {
    type Item = Token<'l>;

    fn next(&mut self) -> Option<Self::Item> {
        let kind = self.inner.next()?;
        let slice = self.inner.slice();

        let range = {
            let Range { start, end } = self.inner.span();

            TextRange::new(
                TextSize::try_from(start).unwrap(),
                TextSize::try_from(end).unwrap(),
            )
        };

        Some(Self::Item { kind, slice, range })
    }
}