minify in chunks for JS

min/lib/Minify.php

@@ -487,10 +487,21 @@ class Minify {
             ? self::$_options['minifiers'][$type]
             : false;
 
-        // minify each source with its own options and minifier, then combine.
-        // Here we used to combine all first but this was probably
-        // bad for PCRE performance, esp. in CSS.
-        foreach (self::$_controller->sources as $source) {
+        // process groups of sources with identical minifiers/options
+        $content = array();
+        $i = 0;
+        $l = count(self::$_controller->sources);
+        $groupToProcessTogether = array();
+        $lastMinifier = null;
+        $lastOptions = null;
+        do {
+            // get next source
+            $source = null;
+            if ($i < $l) {
+                $source = self::$_controller->sources[$i];
+                /* @var Minify_Source $source */
+                $sourceContent = $source->getContent();
+
                 // allow the source to override our minifier and options
                 $minifier = (null !== $source->minifier)
                     ? $source->minifier
@@ -498,20 +509,40 @@ class Minify {
                 $options = (null !== $source->minifyOptions)
                     ? array_merge($defaultOptions, $source->minifyOptions)
                     : $defaultOptions;
-            if ($minifier) {
-                self::$_controller->loadMinifier($minifier);
-                // get source content and minify it
+            }
+            // do we need to process our group right now?
+            if ($i > 0                               // no, the first group doesn't exist yet
+                && (
+                    ! $source                        // yes, we ran out of sources
+                    || $type === self::TYPE_CSS      // yes, to process CSS individually (avoiding PCRE bugs/limits)
+                    || $minifier !== $lastMinifier   // yes, minifier changed
+                    || $options !== $lastOptions)    // yes, options changed
+                )
+            {
+                // minify previous sources with last settings
+                $imploded = implode($implodeSeparator, $groupToProcessTogether);
+                $groupToProcessTogether = array();
+                if ($lastMinifier) {
+                    self::$_controller->loadMinifier($lastMinifier);
                     try {
-                    $pieces[] = call_user_func($minifier, $source->getContent(), $options);
+                        $content[] = call_user_func($lastMinifier, $imploded, $lastOptions);
                     } catch (Exception $e) {
-                    throw new Exception("Exception in " . $source->getId() .
-                        ": " . $e->getMessage());
+                        throw new Exception("Exception in minifier: " . $e->getMessage());
                     }
                 } else {
-                $pieces[] = $source->getContent();
+                    $content[] = $imploded;
                 }
             }
-        $content = implode($implodeSeparator, $pieces);
+            // add content to the group
+            if ($source) {
+                $groupToProcessTogether[] = $sourceContent;
+                $lastMinifier = $minifier;
+                $lastOptions = $options;
+            }
+            $i++;
+        } while ($source);
+
+        $content = implode($implodeSeparator, $content);
         
         if ($type === self::TYPE_CSS && false !== strpos($content, '@import')) {
             $content = self::_handleCssImports($content);

min_unit_tests/_test_files/minify/minified.js

@@ -1,6 +1,5 @@
 (function(){var
-reMailto=/^mailto:my_name_is_(\S+)_and_the_domain_is_(\S+)$/,reRemoveTitleIf=/^my name is/,oo=window.onload,fixHrefs=function(){var i=0,l,m;while(l=document.links[i++]){if(m=l.href.match(reMailto)){l.href='mailto:'+m[1]+'@'+m[2];if(reRemoveTitleIf.test(l.title)){l.title='';}}}};window.onload=function(){oo&&oo();fixHrefs();};})();
-;var MrClay=window.MrClay||{};MrClay.QueryString=function(){var parse=function(str){var assignments=str.split('&'),obj={},propValue;for(var i=0,l=assignments.length;i<l;++i){propValue=assignments[i].split('=');if(propValue.length>2||-1!=propValue[0].indexOf('+')||propValue[0]==''){continue;}
+reMailto=/^mailto:my_name_is_(\S+)_and_the_domain_is_(\S+)$/,reRemoveTitleIf=/^my name is/,oo=window.onload,fixHrefs=function(){var i=0,l,m;while(l=document.links[i++]){if(m=l.href.match(reMailto)){l.href='mailto:'+m[1]+'@'+m[2];if(reRemoveTitleIf.test(l.title)){l.title='';}}}};window.onload=function(){oo&&oo();fixHrefs();};})();;var MrClay=window.MrClay||{};MrClay.QueryString=function(){var parse=function(str){var assignments=str.split('&'),obj={},propValue;for(var i=0,l=assignments.length;i<l;++i){propValue=assignments[i].split('=');if(propValue.length>2||-1!=propValue[0].indexOf('+')||propValue[0]==''){continue;}
 if(propValue.length==1){propValue[1]=propValue[0];}
 obj[unescape(propValue[0])]=unescape(propValue[1].replace(/\+/g,' '));}
 return obj;};function construct_(spec){spec=spec||window;if(typeof spec=='object'){this.window=spec;spec=spec.location.search.substr(1);}else{this.window=window;}

min_unit_tests/test_Minify.php

@@ -98,7 +98,7 @@ function test_Minify()
     // test for Issue 73
     Minify::setCache(null);
     
-    $expected = "\n;function h(){}";
+    $expected = ";function h(){}";
     $output = Minify::serve('Files', array(
         'files' => array(
             $minifyTestPath . '/issue73_1.js'