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File: /var/www/quadcode.com/node_modules/svelte/src/compiler/parse/read/expression.js
import { parse_expression_at } from '../acorn.js';
import { regex_whitespace } from '../../utils/patterns.js';
import parser_errors from '../errors.js';

/**
 * @param {import('../index.js').Parser} parser
 * @returns {import('estree').Node | undefined}
 */
export default function read_expression(parser) {
	try {
		const node = parse_expression_at(parser.template, parser.index);

		let num_parens = 0;

		for (let i = parser.index; i < node.start; i += 1) {
			if (parser.template[i] === '(') num_parens += 1;
		}

		let index = node.end;
		while (num_parens > 0) {
			const char = parser.template[index];

			if (char === ')') {
				num_parens -= 1;
			} else if (!regex_whitespace.test(char)) {
				parser.error(parser_errors.unexpected_token(')'), index);
			}

			index += 1;
		}

		parser.index = index;

		return node;
	} catch (err) {
		parser.acorn_error(err);
	}
}