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Improve shebang handling.

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Avoid doing stuff until it's necessary.
This commit is contained in:
Nicholas Nethercote 2022-07-27 12:15:35 +10:00
parent 038f9e6bef
commit 55185992d6
1 changed files with 5 additions and 8 deletions
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13
compiler/rustc_parse/src/lexer/mod.rs
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@ -64,14 +64,11 @@ impl<'a> StringReader<'a> {
let mut spacing = Spacing::Joint;
// Skip `#!` at the start of the file
let start_src_index = self.src_index(self.pos);
let text: &str = &self.src[start_src_index..self.end_src_index];
let is_beginning_of_file = self.pos == self.start_pos;
if is_beginning_of_file {
if let Some(shebang_len) = rustc_lexer::strip_shebang(text) {
self.pos = self.pos + BytePos::from_usize(shebang_len);
spacing = Spacing::Alone;
}
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);
spacing = Spacing::Alone;
}
// Skip trivial (whitespace & comments) tokens