Method parseExpression

src/parser.ts:1751–1770

()

    // https://tc39.github.io/ecma262/#sec-comma-operator

    parseExpression(): Node.Expression | Node.SequenceExpression {
        const startToken = this.lookahead;
        let expr = this.isolateCoverGrammar(this.parseAssignmentExpression);

        if (this.match(',')) {
            const expressions: Node.Expression[] = [];
            expressions.push(expr);
            while (this.lookahead.type !== Token.EOF) {
                if (!this.match(',')) {
                    break;
                }
                this.nextToken();
                expressions.push(this.isolateCoverGrammar(this.parseAssignmentExpression));
            }

            expr = this.finalize(this.startNode(startToken), new Node.SequenceExpression(expressions));
        }

        return expr;
    }

    // https://tc39.github.io/ecma262/#sec-block