src/compiler/parse/read/expression.ts


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// @ts-nocheck

import { parse_expression_at } from '../acorn.js';
import { Parser } from '../index.js';
import { whitespace } from '../../utils/patterns.js';
// import { Node } from 'estree';

export default function read_expression(parser: Parser): string {
	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 (!whitespace.test(char)) {
				parser.error({
					code: 'unexpected-token',
					message: 'Expected )'
				}, index);
			}

			index += 1;
		}

		parser.index = index;
		
		return parser.template.substring(node.start, node.end);
		// return node as Node;
	} catch (err) {
		parser.acorn_error(err);
	}
}