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perf: Ensure canInsertSemicolon is always called last

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It does a lot of checks and a regex test
This commit is contained in:
Daniel Tschinder 2019-01-15 23:32:18 -08:00
parent 455e003567
commit 58768072ef
2 changed files with 7 additions and 6 deletions
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11
packages/babel-parser/src/parser/expression.js
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@ -869,9 +869,9 @@ export default class ExpressionParser extends LValParser {
return this.parseFunction(node, false, false, true); return this.parseFunction(node, false, false, true);
} else if ( } else if (
canBeArrow && canBeArrow &&
!this.canInsertSemicolon() &&
id.name === "async" && id.name === "async" &&
this.match(tt.name) this.match(tt.name) &&
!this.canInsertSemicolon()
) { ) {
const oldYOAIPAP = this.state.yieldOrAwaitInPossibleArrowParameters; const oldYOAIPAP = this.state.yieldOrAwaitInPossibleArrowParameters;
const oldInAsync = this.state.inAsync; const oldInAsync = this.state.inAsync;
@ -886,7 +886,8 @@ export default class ExpressionParser extends LValParser {
return node; return node;
} }
if (canBeArrow && !this.canInsertSemicolon() && this.eat(tt.arrow)) { if (canBeArrow && this.match(tt.arrow) && !this.canInsertSemicolon()) {
this.next();
const oldYOAIPAP = this.state.yieldOrAwaitInPossibleArrowParameters; const oldYOAIPAP = this.state.yieldOrAwaitInPossibleArrowParameters;
this.state.yieldOrAwaitInPossibleArrowParameters = null; this.state.yieldOrAwaitInPossibleArrowParameters = null;
this.parseArrowExpression(node, [id]); this.parseArrowExpression(node, [id]);
@ -2076,8 +2077,8 @@ export default class ExpressionParser extends LValParser {
this.next(); this.next();
if ( if (
this.match(tt.semi) || this.match(tt.semi) ||
this.canInsertSemicolon() || (!this.match(tt.star) && !this.state.type.startsExpr) ||
(!this.match(tt.star) && !this.state.type.startsExpr) this.canInsertSemicolon()
) { ) {
node.delegate = false; node.delegate = false;
node.argument = null; node.argument = null;

2
packages/babel-parser/src/plugins/flow.js
View File

@ -1398,7 +1398,7 @@ export default (superClass: Class<Parser>): Class<Parser> =>
const startPos = this.state.start, const startPos = this.state.start,
startLoc = this.state.startLoc; startLoc = this.state.startLoc;
let type = this.flowParsePrimaryType(); let type = this.flowParsePrimaryType();
while (!this.canInsertSemicolon() && this.match(tt.bracketL)) { while (this.match(tt.bracketL) && !this.canInsertSemicolon()) {
const node = this.startNodeAt(startPos, startLoc); const node = this.startNodeAt(startPos, startLoc);
node.elementType = type; node.elementType = type;
this.expect(tt.bracketL); this.expect(tt.bracketL);