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authorbors[bot] <26634292+bors[bot]@users.noreply.github.com>2020-06-26 20:25:46 +0100
committerGitHub <[email protected]>2020-06-26 20:25:46 +0100
commit7488cd6a1b3604d6b4f11a7f83b6006a34cda0c0 (patch)
treebd1d793159823b525efb359ddd352839fbe24c14 /crates/ra_parser/src
parente628c6635917cb9a280b435cc1cd55bc511ed770 (diff)
parent2c72d2f438fe0f8b1cbc41ac12e578a5817bafc4 (diff)
Merge #5083
5083: Micro-optimize lookahead in composite tokens r=matklad a=lnicola I'm not sure that this is measurable, but can't hurt, I guess. Co-authored-by: LaurenČ›iu Nicola <[email protected]>
Diffstat (limited to 'crates/ra_parser/src')
-rw-r--r--crates/ra_parser/src/parser.rs15
1 files changed, 11 insertions, 4 deletions
diff --git a/crates/ra_parser/src/parser.rs b/crates/ra_parser/src/parser.rs
index 4f59b0a23..d797f2cc9 100644
--- a/crates/ra_parser/src/parser.rs
+++ b/crates/ra_parser/src/parser.rs
@@ -127,17 +127,24 @@ impl<'t> Parser<'t> {
127 127
128 fn at_composite2(&self, n: usize, k1: SyntaxKind, k2: SyntaxKind) -> bool { 128 fn at_composite2(&self, n: usize, k1: SyntaxKind, k2: SyntaxKind) -> bool {
129 let t1 = self.token_source.lookahead_nth(n); 129 let t1 = self.token_source.lookahead_nth(n);
130 if t1.kind != k1 || !t1.is_jointed_to_next {
131 return false;
132 }
130 let t2 = self.token_source.lookahead_nth(n + 1); 133 let t2 = self.token_source.lookahead_nth(n + 1);
131 t1.kind == k1 && t1.is_jointed_to_next && t2.kind == k2 134 t2.kind == k2
132 } 135 }
133 136
134 fn at_composite3(&self, n: usize, k1: SyntaxKind, k2: SyntaxKind, k3: SyntaxKind) -> bool { 137 fn at_composite3(&self, n: usize, k1: SyntaxKind, k2: SyntaxKind, k3: SyntaxKind) -> bool {
135 let t1 = self.token_source.lookahead_nth(n); 138 let t1 = self.token_source.lookahead_nth(n);
139 if t1.kind != k1 || !t1.is_jointed_to_next {
140 return false;
141 }
136 let t2 = self.token_source.lookahead_nth(n + 1); 142 let t2 = self.token_source.lookahead_nth(n + 1);
143 if t2.kind != k2 || !t2.is_jointed_to_next {
144 return false;
145 }
137 let t3 = self.token_source.lookahead_nth(n + 2); 146 let t3 = self.token_source.lookahead_nth(n + 2);
138 (t1.kind == k1 && t1.is_jointed_to_next) 147 t3.kind == k3
139 && (t2.kind == k2 && t2.is_jointed_to_next)
140 && t3.kind == k3
141 } 148 }
142 149
143 /// Checks if the current token is in `kinds`. 150 /// Checks if the current token is in `kinds`.