diff options
Diffstat (limited to 'src/libsyntax/parse/parser.rs')
| -rw-r--r-- | src/libsyntax/parse/parser.rs | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs index 722f8969fb0..75ab768d55d 100644 --- a/src/libsyntax/parse/parser.rs +++ b/src/libsyntax/parse/parser.rs @@ -511,13 +511,15 @@ impl<'a> Parser<'a> { is_present } + /// If the next token is the given keyword, returns `true` without eating it. + /// An expectation is also added for diagnostics purposes. fn check_keyword(&mut self, kw: Symbol) -> bool { self.expected_tokens.push(TokenType::Keyword(kw)); self.token.is_keyword(kw) } - /// If the next token is the given keyword, eats it and returns - /// `true`. Otherwise, returns `false`. + /// If the next token is the given keyword, eats it and returns `true`. + /// Otherwise, returns `false`. An expectation is also added for diagnostics purposes. pub fn eat_keyword(&mut self, kw: Symbol) -> bool { if self.check_keyword(kw) { self.bump(); @@ -896,6 +898,8 @@ impl<'a> Parser<'a> { self.expected_tokens.clear(); } + /// Look-ahead `dist` tokens of `self.token` and get access to that token there. + /// When `dist == 0` then the current token is looked at. pub fn look_ahead<R>(&self, dist: usize, looker: impl FnOnce(&Token) -> R) -> R { if dist == 0 { return looker(&self.token); |