From 9439bf61fa3aa6b4edb163cc6f162949073559fa Mon Sep 17 00:00:00 2001
From: Lea Verou <lea@verou.me>
Date: Thu, 15 Oct 2020 20:19:32 +0300
Subject: [PATCH] Strip url() before matching colors

Rel #32
---
 js/32-colors.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/js/32-colors.js b/js/32-colors.js
index 545639f..d377c4a 100644
--- a/js/32-colors.js
+++ b/js/32-colors.js
@@ -47,7 +47,7 @@ function countMatches(haystack, needle) {
 	for (let match of haystack.matchAll(needle)) {
 		ret++;
 	}
-	
+
 	return ret;
 }
 
@@ -86,6 +86,12 @@ function lin_P3_to_sRGB (linP3) {
 }
 
 walkDeclarations(ast, ({property, value}) => {
+	// First remove url() references to avoid them mucking the results
+	for (let f of extractFunctionCalls(value, {names: "url"})) {
+		let [start, end] = f.pos;
+		value = value.substring(0, start) + "url()" + " ".repeat(end - start - 5) + value.substring(end);
+	}
+
 	usage.hex[3] += countMatches(value, /#[a-f0-9]{3}\b/gi);
 	usage.hex[4] += countMatches(value, /#[a-f0-9]{4}\b/gi);
 	usage.hex[6] += countMatches(value, /#[a-f0-9]{6}\b/gi);