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
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
use {SyntaxKind, TextRange, TextUnit, Token};
use syntax_kinds::EOF;
use super::is_insignificant;
use std::ops::{Add, AddAssign};
pub(crate) struct ParserInput<'t> {
#[allow(unused)]
text: &'t str,
#[allow(unused)]
start_offsets: Vec<TextUnit>,
tokens: Vec<Token>, // non-whitespace tokens
}
impl<'t> ParserInput<'t> {
pub fn new(text: &'t str, raw_tokens: &'t [Token]) -> ParserInput<'t> {
let mut tokens = Vec::new();
let mut start_offsets = Vec::new();
let mut len = TextUnit::new(0);
for &token in raw_tokens.iter() {
if !is_insignificant(token.kind) {
tokens.push(token);
start_offsets.push(len);
}
len += token.len;
}
ParserInput {
text,
start_offsets,
tokens,
}
}
pub fn kind(&self, pos: InputPosition) -> SyntaxKind {
let idx = pos.0 as usize;
if !(idx < self.tokens.len()) {
return EOF;
}
self.tokens[idx].kind
}
#[allow(unused)]
pub fn text(&self, pos: InputPosition) -> &'t str {
let idx = pos.0 as usize;
if !(idx < self.tokens.len()) {
return "";
}
let range = TextRange::from_len(self.start_offsets[idx], self.tokens[idx].len);
&self.text[range]
}
}
#[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq)]
pub(crate) struct InputPosition(u32);
impl InputPosition {
pub fn new() -> Self {
InputPosition(0)
}
}
impl Add<u32> for InputPosition {
type Output = InputPosition;
fn add(self, rhs: u32) -> InputPosition {
InputPosition(self.0 + rhs)
}
}
impl AddAssign<u32> for InputPosition {
fn add_assign(&mut self, rhs: u32) {
self.0 += rhs
}
}
|