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simplify isLookaheadRelational method (#11922)

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* refactor: move isLookaheadRelational to flow plugins

* refactor: simplify isLookaheadRelational to isLookaheadToken_lt
This commit is contained in:
Huáng Jùnliàng
2020-08-05 20:21:35 -04:00
committed by GitHub
parent cd577eedfd
commit 76f033f8c7
2 changed files with 13 additions and 14 deletions
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14
packages/babel-parser/src/plugins/flow.js
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@@ -2873,7 +2873,7 @@ export default (superClass: Class<Parser>): Class<Parser> =>
noCalls: ?boolean,
subscriptState: N.ParseSubscriptState,
): N.Expression {
if (this.match(tt.questionDot) && this.isLookaheadRelational("<")) {
if (this.match(tt.questionDot) && this.isLookaheadToken_lt()) {
subscriptState.optionalChainMember = true;
if (noCalls) {
subscriptState.stop = true;
@@ -3475,4 +3475,16 @@ export default (superClass: Class<Parser>): Class<Parser> =>
super.updateContext(prevType);
}
}
// check if the next token is a tt.relation("<")
isLookaheadToken_lt(): boolean {
const next = this.nextTokenStart();
if (this.input.charCodeAt(next) === charCodes.lessThan) {
const afterNext = this.input.charCodeAt(next + 1);
return (
afterNext !== charCodes.lessThan && afterNext !== charCodes.equalsTo
);
}
return false;
}
};