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More lexer improvements #102302

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merged 15 commits into from
Sep 28, 2022
Merged

More lexer improvements #102302

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66e9b11
Rearrange `TokenTreesReader::parse_token_tree`.
nnethercote Sep 21, 2022
14281e6
Remove unnecessary `spacing` assignment.
nnethercote Sep 21, 2022
9640d1c
Move `#!` checking.
nnethercote Sep 21, 2022
d7928a9
Clarify spacing computation.
nnethercote Sep 21, 2022
5b2075e
Remove `TokenTreesReader::bump`.
nnethercote Sep 21, 2022
33ba277
Remove `ast::Token::take`.
nnethercote Sep 26, 2022
33516ac
[ui] Rearrange `StringReader`/`TokenTreesReader` creation.
nnethercote Sep 25, 2022
aa6bfaf
Make `rustc_lexer::cursor::Cursor` public.
nnethercote Sep 25, 2022
ceb25d1
Use less DRY in `cook_lexer_token`.
nnethercote Sep 26, 2022
cc0022a
Rename some things.
nnethercote Sep 26, 2022
da84f0f
Add `rustc_lexer::TokenKind::Eof`.
nnethercote Sep 26, 2022
fb4dba0
Inline and remove `cook_lexer_token`.
nnethercote Sep 26, 2022
880ebb6
Minor improvements.
nnethercote Sep 26, 2022
7f7e216
Rename some variables.
nnethercote Sep 27, 2022
d0a26ac
Address review comments.
nnethercote Sep 28, 2022
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17 changes: 8 additions & 9 deletions compiler/rustc_parse/src/lexer/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -38,10 +38,16 @@ pub struct UnmatchedBrace {

pub(crate) fn parse_token_trees<'a>(
sess: &'a ParseSess,
src: &'a str,
start_pos: BytePos,
mut src: &'a str,
mut start_pos: BytePos,
override_span: Option<Span>,
) -> (PResult<'a, TokenStream>, Vec<UnmatchedBrace>) {
// Skip `#!`, if present.
if let Some(shebang_len) = rustc_lexer::strip_shebang(src) {
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src = &src[shebang_len..];
start_pos = start_pos + BytePos::from_usize(shebang_len);
}

StringReader { sess, start_pos, pos: start_pos, src, override_span }.into_token_trees()
}

Expand All @@ -65,13 +71,6 @@ impl<'a> StringReader<'a> {
fn next_token(&mut self) -> (Spacing, Token) {
let mut spacing = Spacing::Joint;

// Skip `#!` at the start of the file
if self.pos == self.start_pos
&& let Some(shebang_len) = rustc_lexer::strip_shebang(self.src)
{
self.pos = self.pos + BytePos::from_usize(shebang_len);
}

// Skip trivial (whitespace & comments) tokens
loop {
let start_src_index = self.src_index(self.pos);
Expand Down