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Miscellaneous perf tweak (#10421)

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* refactor: early return on hot path

* refactor: read next2 only when next is dot

* perf: mini refactor
This commit is contained in:
Huáng Jùnliàng 2019-09-10 13:47:52 -04:00 committed by Nicolò Ribaudo
parent 610d6bdc62
commit 4395c22f3a
2 changed files with 11 additions and 8 deletions
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5
packages/babel-parser/src/parser/comments.js
View File

@ -39,10 +39,11 @@ export default class CommentsParser extends BaseParser {
}
adjustCommentsAfterTrailingComma(node: Node, elements: Node[]) {
if (elements.length === 0) {
if (this.state.leadingComments.length === 0) {
return;
}
if (this.state.leadingComments.length === 0) {
if (elements.length === 0) {
return;
}

12
packages/babel-parser/src/tokenizer/index.js
View File

@ -234,8 +234,8 @@ export default class Tokenizer extends LocationParser {
skipBlockComment(): void {
const startLoc = this.state.curPosition();
const start = this.state.pos;
const end = this.input.indexOf("*/", (this.state.pos += 2));
if (end === -1) this.raise(this.state.pos - 2, "Unterminated comment");
const end = this.input.indexOf("*/", this.state.pos + 2);
if (end === -1) this.raise(start, "Unterminated comment");
this.state.pos = end + 2;
lineBreakG.lastIndex = start;
@ -404,8 +404,10 @@ export default class Tokenizer extends LocationParser {
return;
}
const next2 = this.input.charCodeAt(this.state.pos + 2);
if (next === charCodes.dot && next2 === charCodes.dot) {
if (
next === charCodes.dot &&
this.input.charCodeAt(this.state.pos + 2) === charCodes.dot
) {
this.state.pos += 3;
this.finishToken(tt.ellipsis);
} else {
@ -900,9 +902,9 @@ export default class Tokenizer extends LocationParser {
let val;
if (this.hasPlugin("numericSeparator")) {
if (code === charCodes.underscore) {
const prev = this.input.charCodeAt(this.state.pos - 1);
const next = this.input.charCodeAt(this.state.pos + 1);
if (code === charCodes.underscore) {
if (allowedSiblings.indexOf(next) === -1) {
this.raise(this.state.pos, "Invalid or unexpected token");
}