1 files changed, 90 insertions, 0 deletions
diff --git a/min/lib/Minify/CommentPreserver.php b/min/lib/Minify/CommentPreserver.php
new file mode 100644
index 0000000..f56eb34
--- /dev/null
+++ b/min/lib/Minify/CommentPreserver.php
@@ -0,0 +1,90 @@
+<?php
+/**
+ * Class Minify_CommentPreserver 
+ * @package Minify
+ */
+
+/**
+ * Process a string in pieces preserving C-style comments that begin with "/*!"
+ * 
+ * @package Minify
+ * @author Stephen Clay <steve@mrclay.org>
+ */
+class Minify_CommentPreserver {
+    
+    /**
+     * String to be prepended to each preserved comment
+     *
+     * @var string
+     */
+    public static $prepend = "\n";
+    
+    /**
+     * String to be appended to each preserved comment
+     *
+     * @var string
+     */
+    public static $append = "\n";
+    
+    /**
+     * Process a string outside of C-style comments that begin with "/*!"
+     *
+     * On each non-empty string outside these comments, the given processor 
+     * function will be called. The first "!" will be removed from the 
+     * preserved comments, and the comments will be surrounded by 
+     * Minify_CommentPreserver::$preprend and Minify_CommentPreserver::$append.
+     * 
+     * @param string $content
+     * @param callback $processor function
+     * @param array $args array of extra arguments to pass to the processor 
+     * function (default = array())
+     * @return string
+     */
+    public static function process($content, $processor, $args = array())
+    {
+        $ret = '';
+        while (true) {
+            list($beforeComment, $comment, $afterComment) = self::_nextComment($content);
+            if ('' !== $beforeComment) {
+                $callArgs = $args;
+                array_unshift($callArgs, $beforeComment);
+                $ret .= call_user_func_array($processor, $callArgs);    
+            }
+            if (false === $comment) {
+                break;
+            }
+            $ret .= $comment;
+            $content = $afterComment;
+        }
+        return $ret;
+    }
+    
+    /**
+     * Extract comments that YUI Compressor preserves.
+     * 
+     * @param string $in input
+     * 
+     * @return array 3 elements are returned. If a YUI comment is found, the
+     * 2nd element is the comment and the 1st and 2nd are the surrounding
+     * strings. If no comment is found, the entire string is returned as the 
+     * 1st element and the other two are false.
+     */
+    private static function _nextComment($in)
+    {
+        if (
+            false === ($start = strpos($in, '/*!'))
+            || false === ($end = strpos($in, '*/', $start + 3))
+        ) {
+            return array($in, false, false);
+        }
+        $ret = array(
+            substr($in, 0, $start)
+            ,self::$prepend . '/*' . substr($in, $start + 3, $end - $start - 1) . self::$append
+        );
+        $endChars = (strlen($in) - $end - 2);
+        $ret[] = (0 === $endChars)
+            ? ''
+            : substr($in, -$endChars);
+        return $ret;
+    }
+}