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Do not use lookahead when parsing jsx expression containers (#9988)

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Daniel Tschinder 2019-05-16 17:27:07 -07:00 committed by GitHub
parent 5661de5908
commit 3f0590de2a
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1 changed files with 15 additions and 13 deletions
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28
packages/babel-parser/src/plugins/jsx/index.js
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@ -269,7 +269,9 @@ export default (superClass: Class<Parser>): Class<Parser> =>
let node;
switch (this.state.type) {
case tt.braceL:
node = this.jsxParseExpressionContainer();
node = this.startNode();
this.next();
node = this.jsxParseExpressionContainer(node);
if (node.expression.type === "JSXEmptyExpression") {
throw this.raise(
node.start,
@ -310,10 +312,8 @@ export default (superClass: Class<Parser>): Class<Parser> =>
// Parse JSX spread child
jsxParseSpreadChild(): N.JSXSpreadChild {
const node = this.startNode();
this.expect(tt.braceL);
this.expect(tt.ellipsis);
jsxParseSpreadChild(node: N.JSXSpreadChild): N.JSXSpreadChild {
this.next(); // ellipsis
node.expression = this.parseExpression();
this.expect(tt.braceR);
@ -322,9 +322,9 @@ export default (superClass: Class<Parser>): Class<Parser> =>
// Parses JSX expression enclosed into curly brackets.
jsxParseExpressionContainer(): N.JSXExpressionContainer {
const node = this.startNode();
this.next();
jsxParseExpressionContainer(
node: N.JSXExpressionContainer,
): N.JSXExpressionContainer {
if (this.match(tt.braceR)) {
node.expression = this.jsxParseEmptyExpression();
} else {
@ -423,15 +423,17 @@ export default (superClass: Class<Parser>): Class<Parser> =>
children.push(this.parseExprAtom());
break;
case tt.braceL:
if (this.lookahead().type === tt.ellipsis) {
children.push(this.jsxParseSpreadChild());
case tt.braceL: {
const node = this.startNode();
this.next();
if (this.match(tt.ellipsis)) {
children.push(this.jsxParseSpreadChild(node));
} else {
children.push(this.jsxParseExpressionContainer());
children.push(this.jsxParseExpressionContainer(node));
}
break;
}
// istanbul ignore next - should never happen
default:
throw this.unexpected();