From 81136facc9b103334492de24b7c89a5ba5c68b27 Mon Sep 17 00:00:00 2001
From: JangoBrick <mail@jangobrick.de>
Date: Sun, 13 Nov 2016 17:15:50 +0100
Subject: [PATCH] Add support for rgb/rgba colors with percentages

See #11 for details.
---
 src/SVG.php | 38 ++++++++++++++++++++++++++++----------
 1 file changed, 28 insertions(+), 10 deletions(-)

diff --git a/src/SVG.php b/src/SVG.php
index e07625c..b0f614e 100644
--- a/src/SVG.php
+++ b/src/SVG.php
@@ -12,10 +12,10 @@ final class SVG
     /** @var string COLOR_HEX_3 A RegEx for #FFF etc */
     const COLOR_HEX_3 = '/^#([0-9A-F])([0-9A-F])([0-9A-F])$/i';
 
-    /** @var string COLOR_RGB A RegEx for rgb(255, 255, 255) etc */
-    const COLOR_RGB = '/^rgb\(([+-]?\d*\.?\d*)\s*,\s*([+-]?\d*\.?\d*)\s*,\s*([+-]?\d*\.?\d*)\)$/';
-    /** @var string COLOR_RGBA A RegEx for rgba(255, 255, 255, 0.5) etc */
-    const COLOR_RGBA = '/^rgba\(([+-]?\d*\.?\d*)\s*,\s*([+-]?\d*\.?\d*)\s*,\s*([+-]?\d*\.?\d*)\s*,\s*([+-]?\d*\.?\d*)\)$/';
+    /** @var string COLOR_RGB A RegEx for rgb(255, 255, 255) etc (with percentage support) */
+    const COLOR_RGB = '/^rgb\(([+-]?\d*\.?\d*%?)\s*,\s*([+-]?\d*\.?\d*%?)\s*,\s*([+-]?\d*\.?\d*%?)\)$/';
+    /** @var string COLOR_RGBA A RegEx for rgba(255, 255, 255, 0.5) etc (with percentage support) */
+    const COLOR_RGBA = '/^rgba\(([+-]?\d*\.?\d*%?)\s*,\s*([+-]?\d*\.?\d*%?)\s*,\s*([+-]?\d*\.?\d*%?)\s*,\s*([+-]?\d*\.?\d*)\)$/';
 
     /**
      * Converts any valid SVG length string into an absolute pixel length,
@@ -82,13 +82,13 @@ public static function parseColor($color)
             $g = hexdec($matches[2].$matches[2]);
             $b = hexdec($matches[3].$matches[3]);
         } elseif (preg_match(self::COLOR_RGB, $color, $matches)) {
-            $r = intval($matches[1]);
-            $g = intval($matches[2]);
-            $b = intval($matches[3]);
+            $r = self::parseRGBComponent($matches[1]);
+            $g = self::parseRGBComponent($matches[2]);
+            $b = self::parseRGBComponent($matches[3]);
         } elseif (preg_match(self::COLOR_RGBA, $color, $matches)) {
-            $r = intval($matches[1]);
-            $g = intval($matches[2]);
-            $b = intval($matches[3]);
+            $r = self::parseRGBComponent($matches[1]);
+            $g = self::parseRGBComponent($matches[2]);
+            $b = self::parseRGBComponent($matches[3]);
             $a = intval(floatval($matches[4]) * 255);
         }
 
@@ -100,6 +100,24 @@ public static function parseColor($color)
         return array($r, $g, $b, $a);
     }
 
+    /**
+     * Converts the provided component string (either percentage or number)
+     * into a color component int (0 - 255).
+     *
+     * @param string $component The component string.
+     *
+     * @return int The parsed component int (0 - 255).
+     */
+    private static function parseRGBComponent($component)
+    {
+        $matches = array();
+        if (preg_match('/^([+-]?\d*\.?\d*)%$/', $component, $matches)) {
+            return intval(floatval($matches[1]) * (255 / 100));
+        }
+
+        return intval($component);
+    }
+
     /**
      * @var array[] $namedColors A map of color names to their RGBA arrays.
      * @see https://www.w3.org/TR/SVG11/types.html#ColorKeywords For the source.