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use crate::{SyntaxKind::EOF, TextRange, TextSize, Token};
use rslint_lexer::is_linebreak;
use std::collections::HashSet;
pub struct TokenSource<'t> {
source: &'t str,
tokens_after_linebreaks: HashSet<TextSize>,
token_offset_pairs: Vec<(rslint_lexer::Token, TextSize)>,
pub raw_tokens: &'t [rslint_lexer::Token],
cur: (Token, usize),
}
fn mk_token(pos: usize, token_offset_pairs: &[(rslint_lexer::Token, TextSize)]) -> Token {
let kind = match token_offset_pairs.get(pos) {
Some((token, _)) => token.kind,
None => EOF,
};
let range = token_offset_pairs
.get(pos)
.map(|x| {
let start: usize = x.1.into();
let end = start + x.0.len;
start..end
})
.unwrap_or_else(|| {
token_offset_pairs
.last()
.map(|x| {
let start: usize = x.1.into();
let end = start + x.0.len;
start..end
})
.unwrap_or(0..0)
});
Token {
kind,
range: range.to_owned(),
len: TextSize::from(range.len() as u32),
}
}
impl<'t> TokenSource<'t> {
pub fn new(source: &'t str, raw_tokens: &'t [rslint_lexer::Token]) -> TokenSource<'t> {
let mut tokens_after_linebreaks = HashSet::new();
let mut token_offset_pairs = Vec::with_capacity(raw_tokens.len() / 2);
let mut len: TextSize = 0.into();
let mut has_linebreak = false;
for token in raw_tokens {
if token.kind.is_trivia() {
let src = source
.get(len.into()..(usize::from(len) + token.len))
.expect("src and tokens do not match");
if !has_linebreak && src.chars().any(is_linebreak) {
has_linebreak = true;
}
} else {
if has_linebreak {
tokens_after_linebreaks.insert(len);
has_linebreak = false;
}
token_offset_pairs.push((*token, len));
};
len += TextSize::from(token.len as u32);
}
let first = mk_token(0, token_offset_pairs.as_slice());
TokenSource {
source,
token_offset_pairs,
cur: (first, 0),
tokens_after_linebreaks,
raw_tokens,
}
}
pub fn rewind(&mut self, pos: usize) {
self.cur = (mk_token(pos, &self.token_offset_pairs), pos);
}
pub fn last(&self) -> Option<Token> {
if self.cur.1 == 0 {
return None;
}
Some(mk_token(self.cur.1 - 1, &self.token_offset_pairs))
}
pub fn current(&self) -> Token {
self.cur.0.to_owned()
}
pub fn source(&self) -> &str {
self.source
}
pub fn lookahead_nth(&self, n: usize) -> Token {
mk_token(self.cur.1 + n, &self.token_offset_pairs)
}
pub fn bump(&mut self) {
if self.cur.0.kind == EOF {
return;
}
let pos = self.cur.1 + 1;
self.cur = (mk_token(pos, &self.token_offset_pairs), pos);
}
pub fn is_keyword(&self, kw: &str) -> bool {
self.token_offset_pairs
.get(self.cur.1)
.map(|(token, offset)| {
&self.source[TextRange::at(*offset, TextSize::from(token.len as u32))] == kw
})
.unwrap_or(false)
}
pub fn had_linebreak_before_nth(&self, n: usize) -> bool {
if let Some(i) = self.token_offset_pairs.get(self.cur.1 + n) {
self.tokens_after_linebreaks.contains(&i.1)
} else {
false
}
}
pub fn cur_pos(&self) -> usize {
self.token_offset_pairs[self.cur.1].1.into()
}
pub fn cur_token_idx(&self) -> usize {
self.cur.1
}
pub fn size_hint(&self) -> usize {
self.token_offset_pairs.len()
}
}