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, 34 insertions, 0 deletions

diff --git a/src/compiler/utils/nodes_match.ts b/src/compiler/utils/nodes_match.ts
new file mode 100644
index 000000000..9c8e1fb48
--- /dev/null
+++ b/src/compiler/utils/nodes_match.ts
@@ -0,0 +1,34 @@
+// @ts-nocheck
+
+export function nodes_match(a, b) {
+	if (!!a !== !!b) return false;
+	if (Array.isArray(a) !== Array.isArray(b)) return false;
+
+	if (a && typeof a === 'object') {
+		if (Array.isArray(a)) {
+			if (a.length !== b.length) return false;
+			return a.every((child, i) => nodes_match(child, b[i]));
+		}
+
+		const a_keys = Object.keys(a).sort();
+		const b_keys = Object.keys(b).sort();
+
+		if (a_keys.length !== b_keys.length) return false;
+
+		let i = a_keys.length;
+		while (i--) {
+			const key = a_keys[i];
+			if (b_keys[i] !== key) return false;
+
+			if (key === 'start' || key === 'end') continue;
+
+			if (!nodes_match(a[key], b[key])) {
+				return false;
+			}
+		}
+
+		return true;
+	}
+
+	return a === b;
+}