Bring compiler into Astro (#4)

* include source compiler

* Import from JS

* Conditionally use the instance contents

Co-authored-by: Fred K. Schott <fkschott@gmail.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/src/compiler/parse/read/expression.ts b/src/compiler/parse/read/expression.ts
new file mode 100644
index 000000000..3af2868e6
--- /dev/null
+++ b/src/compiler/parse/read/expression.ts
@@ -0,0 +1,41 @@
+// @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);
+	}
+}