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perf: Simplify reading of tokens.

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This avoids checking isIdentifierStart for every single token
This commit is contained in:
Daniel Tschinder
2019-01-15 13:00:27 -08:00
parent e4b8cfc768
commit 8df0500f55
4 changed files with 19 additions and 19 deletions
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4
packages/babel-parser/src/plugins/flow.js
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@@ -1933,7 +1933,7 @@ export default (superClass: Class<Parser>): Class<Parser> =>
}
// ensure that inside flow types, we bypass the jsx parser plugin
readToken(code: number): void {
getTokenFromCode(code: number): void {
const next = this.state.input.charCodeAt(this.state.pos + 1);
if (
this.state.inType &&
@@ -1944,7 +1944,7 @@ export default (superClass: Class<Parser>): Class<Parser> =>
this.state.isIterator = true;
return super.readWord();
} else {
return super.readToken(code);
return super.getTokenFromCode(code);
}
}

8
packages/babel-parser/src/plugins/jsx/index.js
View File

@@ -93,7 +93,7 @@ export default (superClass: Class<Parser>): Class<Parser> =>
++this.state.pos;
return this.finishToken(tt.jsxTagStart);
}
return this.getTokenFromCode(ch);
return super.getTokenFromCode(ch);
}
out += this.state.input.slice(chunkStart, this.state.pos);
return this.finishToken(tt.jsxText, out);
@@ -520,8 +520,8 @@ export default (superClass: Class<Parser>): Class<Parser> =>
}
}
readToken(code: number): void {
if (this.state.inPropertyName) return super.readToken(code);
getTokenFromCode(code: number): void {
if (this.state.inPropertyName) return super.getTokenFromCode(code);
const context = this.curContext();
@@ -557,7 +557,7 @@ export default (superClass: Class<Parser>): Class<Parser> =>
return this.finishToken(tt.jsxTagStart);
}
return super.readToken(code);
return super.getTokenFromCode(code);
}
updateContext(prevType: TokenType): void {

4
packages/babel-parser/src/plugins/typescript.js
View File

@@ -2213,11 +2213,11 @@ export default (superClass: Class<Parser>): Class<Parser> =>
}
// ensure that inside types, we bypass the jsx parser plugin
readToken(code: number): void {
getTokenFromCode(code: number): void {
if (this.state.inType && (code === 62 || code === 60)) {
return this.finishOp(tt.relational, 1);
} else {
return super.readToken(code);
return super.getTokenFromCode(code);
}
}