Trim.inc in Advanced CSS/JS Aggregation 7

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advagg_css_compress/css-compressor-3.x/src/lib/Trim.inc

<?php

/**
 * CSS Compressor [VERSION]
 * [DATE]
 * Corey Hart @ http://www.codenothing.com
 */
class CSSCompression_Trim {

  /**
   * Trim Patterns
   *
   * @class Control: Compression Controller
   * @param (array) options: Reference to options
   * @param (regex) rcmark: Marking point when traversing through sheet for comments
   * @param (regex) rendcomment: Finds the ending comment point
   * @param (regex) rendquote: Finds the ending quote point
   * @param (regex) rendsinglequote: Finds the ending single quote point
   * @param (array) rescape: Array of patterns of groupings that should be escaped
   * @param (array) trimmings: Stylesheet trimming patterns/replacements
   * @param (array) escaped: Array of characters that need to be escaped
   */
  private $Control;
  private $options = array();
  private $rcmark = "/((?<!\\\\)\\/\\*|(?<!\\\\)\"|(?<!\\\\)')/";
  private $rendcomment = "/\\*\\//";
  private $rendquote = "/(?<!\\\\)\"/";
  private $rendsinglequote = "/(?<!\\\\)'/";
  private $rescape = array(
    "/(url\\()([^'\"].*?)(\\))/is",
    "/((?<!\\\\)\")(.*?)((?<!\\\\)\")/s",
    "/((?<!\\\\)')(.*?)((?<!\\\\)')/s",
  );
  private $trimmings = array(
    'patterns' => array(
      "/(?<!\\\\)(\\s+)?(?<!\\\\)([!,{};>\\~\\+\\/])(?<!\\\\)(\\s+)?/s",
      // Remove un-needed spaces around special characters
      "/url\\((?<!\\\\)\"(.*?)(?<!\\\\)\"\\)/is",
      // Remove quotes from urls
      "/url\\((?<!\\\\)'(.*?)(?<!\\\\)'\\)/is",
      // Remove single quotes from urls
      "/url\\((.*?)\\)/is",
      // Lowercase url wrapper
      "/(?<!\\\\);{2,}/",
      // Remove unecessary semi-colons
      "/(?<!\\\\)\\s+/s",
    ),
    'replacements' => array(
      '$2',
      'url($1)',
      'url($1)',
      'url($1)',
      ';',
      ' ',
    ),
  );
  private $escaped = array(
    'search' => array(
      ":",
      ";",
      "}",
      "{",
      "@",
      "!",
      ",",
      ">",
      "+",
      "~",
      "/",
      "*",
      ".",
      "=",
      "#",
      "\r",
      "\n",
      "\t",
      " ",
    ),
    'replace' => array(
      "\\:",
      "\\;",
      "\\}",
      "\\{",
      "\\@",
      "\\!",
      "\\,",
      "\\>",
      "\\+",
      "\\~",
      "\\/",
      "\\*",
      "\\.",
      "\\=",
      "\\#",
      "\\r",
      "\\n",
      "\\t",
      "\\ ",
    ),
  );

  /**
   * Stash a reference to the controller on each instantiation
   *
   * @param (class) control: CSSCompression Controller
   */
  public function __construct(CSSCompression_Control $control) {
    $this->Control = $control;
    $this->options =& $control->Option->options;
  }

  /**
   * Central trim handler
   *
   * @param (string) css: Stylesheet to trim
   */
  public function trim($css) {
    $css = $this
      ->comments($css);
    $css = $this
      ->escape($css);
    $css = $this
      ->strip($css);
    return $css;
  }

  /**
   * Does a quick run through the script to remove all comments from the sheet,
   *
   * @param (string) css: Stylesheet to trim
   */
  private function comments($css) {
    $pos = 0;
    while (preg_match($this->rcmark, $css, $match, PREG_OFFSET_CAPTURE, $pos)) {
      switch ($match[1][0]) {

        // Start of comment block
        case "/*":
          if (preg_match($this->rendcomment, $css, $m, PREG_OFFSET_CAPTURE, $match[1][1] + 1)) {
            $end = $m[0][1] - $match[1][1] + strlen($m[0][0]);
            $css = substr_replace($css, '', $match[1][1], $end);
            $pos = $match[0][1];
          }
          else {
            $css = substr($css, 0, $match[1][1]);
            break 2;
          }
          break;

        // Start of string
        case "\"":
          if (preg_match($this->rendquote, $css, $m, PREG_OFFSET_CAPTURE, $match[1][1] + 1)) {
            $pos = $m[0][1] + strlen($m[0][0]);
          }
          else {
            break 2;
          }
          break;

        // Start of string
        case "'":
          if (preg_match($this->rendsinglequote, $css, $m, PREG_OFFSET_CAPTURE, $match[1][1] + 1)) {
            $pos = $m[0][1] + strlen($m[0][0]);
          }
          else {
            break 2;
          }
          break;

        // Should have never gotten here
        default:
          break 2;
      }
    }
    return $css;
  }

  /**
   * Escape out possible splitter characters within urls
   *
   * @param (string) css: Full stylesheet
   */
  private function escape($css) {
    foreach ($this->rescape as $regex) {
      $start = 0;
      while (preg_match($regex, $css, $match, PREG_OFFSET_CAPTURE, $start)) {
        $value = $match[1][0] . str_replace($this->escaped['search'], $this->escaped['replace'], $match[2][0]) . $match[3][0];
        $css = substr_replace($css, $value, $match[0][1], strlen($match[0][0]));
        $start = $match[0][1] + strlen($value) + 1;
      }
    }
    return $css;
  }

  /**
   * Runs initial formatting to setup for compression
   *
   * @param (string) css: CSS Contents
   */
  private function strip($css) {

    // Run replacements
    return trim(preg_replace($this->trimmings['patterns'], $this->trimmings['replacements'], $css));
  }

  /**
   * Access to private methods for testing
   *
   * @param (string) method: Method to be called
   * @param (array) args: Array of paramters to be passed in
   */
  public function access($method, $args) {
    if (method_exists($this, $method)) {
      return call_user_func_array(array(
        $this,
        $method,
      ), $args);
    }
    else {
      throw new CSSCompression_Exception("Unknown method in Trim Class - " . $method);
    }
  }

}

Classes

Name	Description
CSSCompression_Trim	CSS Compressor [VERSION] [DATE] Corey Hart @ http://www.codenothing.com