Fixes #17

cssmin.php

@@ -342,7 +342,7 @@ private function minify($css, $linebreak_pos)
         $css = preg_replace('/([^\\\\]\:|\s)0(?:em|ex|ch|rem|vw|vh|vm|vmin|cm|mm|in|px|pt|pc|%)/iS', '${1}0', $css);
 
 		// 0% step in a keyframe? restore the % unit
-		$css = preg_replace_callback('/(@[a-z\-]*?keyframes[^\{]*?\{)(.*?\}\s*\})/iS', array($this, 'replace_keyframe_zero'), $css);
+		$css = preg_replace_callback('/(@[a-z\-]*?keyframes[^\{]+\{)(.*?)(\}\})/iS', array($this, 'replace_keyframe_zero'), $css);
 
         // Replace 0 0; or 0 0 0; or 0 0 0 0; with 0.
         $css = preg_replace('/\:0(?: 0){1,3}(;|\}| \!)/', ':0$1', $css);
@@ -598,7 +598,7 @@ private function preserve_old_IE_specific_matrix_definition($matches)
 
 	private function replace_keyframe_zero($matches)
     {
-        return $matches[1] . preg_replace('/0\s*,/', '0%,', preg_replace('/\s*0\s*\{/', '0%{', $matches[2]));
+        return $matches[1] . preg_replace('/0(\{|,[^\{]+\{)/', '0%$1', $matches[2]) . $matches[3];
     }
 
     private function rgb_to_hex($matches)

tests/mine/keyframes.css

@@ -15,4 +15,7 @@
 @keyframes test3 {
 	50% { opacity: 50 }
     100%, 0% { opacity: 0; }
+}
+@-webkit-keyframes test4{
+    0% { transform: rotate3d(0,0,1,30deg); }
 }

tests/mine/keyframes.css.min

@@ -1 +1 @@
-@keyframes anim{0%{opacity:0}100%{opacity:1}}@-o-keyframes anim{0%{opacity:0}100%{opacity:1}}@keyframes test{0%,100%{opacity:0}}@keyframes test2{0%,100%{opacity:0}}@keyframes test3{50%{opacity:50}100%,0%{opacity:0}}
+@keyframes anim{0%{opacity:0}100%{opacity:1}}@-o-keyframes anim{0%{opacity:0}100%{opacity:1}}@keyframes test{0%,100%{opacity:0}}@keyframes test2{0%,100%{opacity:0}}@keyframes test3{50%{opacity:50}100%,0%{opacity:0}}@-webkit-keyframes test4{0%{transform:rotate3d(0,0,1,30deg)}}

tests/mine/zeros.css

@@ -2,6 +2,7 @@ a{
 	padding: +0000% 0.0% 0in 00.000;
 	margin:-.0em .000pc +0px -00.0000%;
     transition-duration: 0s;
+    left: -20.0px;
 }
 b{
 	leading: 0050% -0010.5% 001.004in -0.45vw;

tests/mine/zeros.css.min

@@ -1 +1 @@
-a{padding:0;margin:0;transition-duration:0s}b{leading:50% -10.5% 1.004in -.45vw;trailing:5000% .5px 1.2001em .405;transition-duration:0ms;transform:rotate3d(0grad,0rad,0deg);pitch:0KHZ;pitch:0hz}body{margin:9px 9.8px 0 .9em;height:9.9;width:.5;z-index:.09;font-size:9;top:0;bottom:0}:lang(de)>p.lang\:0\.234500{height:.2em}#\:34\:0500{width:10.01%}.mg0px .lang\:0em{height:20%}
+a{padding:0;margin:0;transition-duration:0s;left:-20px}b{leading:50% -10.5% 1.004in -.45vw;trailing:5000% .5px 1.2001em .405;transition-duration:0ms;transform:rotate3d(0grad,0rad,0deg);pitch:0KHZ;pitch:0hz}body{margin:9px 9.8px 0 .9em;height:9.9;width:.5;z-index:.09;font-size:9;top:0;bottom:0}:lang(de)>p.lang\:0\.234500{height:.2em}#\:34\:0500{width:10.01%}.mg0px .lang\:0em{height:20%}