beginnings of HTML minification support (again)

lib/htmlmin.php

@@ -0,0 +1,69 @@
+<?php
+class HTMLMin {
+  // -- Public Static Methods --------------------------------------------------
+  public static function minify($string) {
+    $htmlmin = new HTMLMin($string);
+    return $htmlmin->getMinifiedHtml();
+  }
+
+  // -- Private Instance Variables ---------------------------------------------
+  private $input;
+
+  // -- Private Instance Methods -----------------------------------------------
+  private function replaceCSS($matches) {
+    // Remove HTML comment markers from the CSS (they shouldn't be there
+    // anyway).
+    $css = preg_replace('/<!--([\s\S]*?)-->/', "$1", $matches[2]);
+    
+    return '<style'.$matches[1].'>'.trim(Minify::min($css, Minify::TYPE_CSS)).
+        '</style>';
+  }
+
+  private function replaceJavaScript($matches) {
+    // Remove HTML comment markers from the JS (they shouldn't be there anyway).
+    $js = preg_replace('/<!--([\s\S]*?)-->/', "$1", $matches[2]);
+
+    return '<script'.$matches[1].'>'.trim(Minify::min($js, Minify::TYPE_JS)).
+        '</script>';
+  }
+
+  // -- Public Instance Methods ------------------------------------------------
+  public function __construct($input = '') {
+    $this->setInput($input);
+  }
+
+  public function getInput() {
+    return $this->input;
+  }
+
+  public function getMinifiedHtml() {
+    $html = trim($this->input);
+
+    // Run JavaScript blocks through JSMin.
+    $html = preg_replace_callback('/<script(\s+[\s\S]*?)?>([\s\S]*?)<\/script>/i',
+        array($this, 'replaceJavaScript'), $html);
+
+    // Run CSS blocks through Minify's CSS minifier.
+    $html = preg_replace_callback('/<style(\s+[\s\S]*?)?>([\s\S]*?)<\/style>/i',
+        array($this, 'replaceCSS'), $html);
+
+    // Remove HTML comments (but not IE conditional comments).
+    $html = preg_replace('/<!--[^[][\s\S]*?-->/', '', $html);
+
+    // Remove leading and trailing whitespace from each line.
+    // FIXME: This needs to take into account attribute values that span multiple lines.
+    $html = preg_replace('/^\s*(.*?)\s*$/m', "$1", $html);
+    
+    // Remove unnecessary whitespace between and inside elements.
+    $html = preg_replace('/>\s+(\S[\s\S]*?)?</', "> $1<", $html);
+    $html = preg_replace('/>(\S[\s\S]*?)?\s+</', ">$1 <", $html);
+    $html = preg_replace('/>\s+</', "> <", $html);
+    
+    return $html;
+  }
+
+  public function setInput($input) {
+    $this->input = $input;
+  }
+}
+?>