MarginPadding.inc in Advanced CSS/JS Aggregation 6

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advagg_css_compress/css-compressor-3.x/src/lib/Combine/MarginPadding.inc

<?php

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

  /**
   * Combine Patterns
   *
   * @class Control: Compression Controller
   * @class Combine: Combine Controller
   * @param (regex) rspace: Checks for space without an escape '\' character before it
   * @param (regex) rmp: Margin/Padding matching
   * @param (regex) rmpbase: Margin/Padding base match
   */
  private $Control;
  private $Combine;
  private $rspace = "/(?<!\\\\)\\s/";
  private $rmp = "/(^|(?<!\\\\);)(margin|padding)-(top|right|bottom|left):(.*?)((?<!\\\\);|\$)/";
  private $rmpbase = "/(^|(?<!\\\\);)(margin|padding):(.*?)((?<!\\\\);|\$)/";

  /**
   * Stash a reference to the controller & combiner
   *
   * @param (class) control: CSSCompression Controller
   * @param (class) combine: CSSCompression Combiner
   */
  public function __construct(CSSCompression_Control $control, CSSCompression_Combine $combine) {
    $this->Control = $control;
    $this->Combine = $combine;
  }

  /**
   * Combines multiple directional properties of
   * margin/padding into single definition.
   *
   * @param (string) val: Rule Set
   */
  public function combine($val) {
    $val = $this
      ->expand($val);
    $storage = $this
      ->storage($val);
    $pos = 0;

    // Now rebuild the string replacing all instances of margin/padding if shorthand exists
    while (preg_match($this->rmp, $val, $match, PREG_OFFSET_CAPTURE, $pos)) {
      $prop = $match[2][0];
      if (isset($storage[$prop])) {
        $colon = strlen($match[1][0]);
        $val = substr_replace($val, $storage[$prop], $match[0][1] + $colon, strlen($match[0][0]) - $colon);
        $pos = $match[0][1] + strlen($storage[$prop]) - $colon - 1;
        $storage[$prop] = '';
      }
      else {
        $pos = $match[0][1] + strlen($match[0][0]) - 1;
      }
    }

    // Return converted val
    return $val;
  }

  /**
   * Build the storage object for iteration
   *
   * @param (string) val: Rule Set
   */
  private function storage($val) {
    $storage = array();
    $pos = 0;

    // Find all possible occurences of margin/padding and mark their directional value
    while (preg_match($this->rmp, $val, $match, PREG_OFFSET_CAPTURE, $pos)) {
      if (!isset($storage[$match[2][0]])) {
        $storage[$match[2][0]] = array(
          $match[3][0] => $match[4][0],
        );
      }

      // Override double written properties
      $storage[$match[2][0]][$match[3][0]] = $match[4][0];
      $pos = $match[0][1] + strlen($match[0][0]) - 1;
    }

    // Go through each tag for possible combination
    foreach ($storage as $tag => $arr) {

      // Only combine if all 4 definitions are found
      if (count($arr) == 4 && !$this->Combine
        ->checkUncombinables($arr)) {

        // All 4 are the same
        if ($arr['top'] == $arr['bottom'] && $arr['left'] == $arr['right'] && $arr['top'] == $arr['left']) {
          $storage[$tag] = "{$tag}:" . $arr['top'] . ';';
        }
        else {
          if ($arr['top'] == $arr['bottom'] && $arr['left'] == $arr['right']) {
            $storage[$tag] = "{$tag}:" . $arr['top'] . ' ' . $arr['left'] . ';';
          }
          else {
            if ($arr['right'] == $arr['left']) {
              $storage[$tag] = "{$tag}:" . $arr['top'] . ' ' . $arr['right'] . ' ' . $arr['bottom'] . ';';
            }
            else {
              $storage[$tag] = "{$tag}:" . $arr['top'] . ' ' . $arr['right'] . ' ' . $arr['bottom'] . ' ' . $arr['left'] . ';';
            }
          }
        }
      }
      else {
        unset($storage[$tag]);
      }
    }
    return $storage;
  }

  /**
   * Explodes shorthanded margin/padding properties for later combination
   *
   * @param (string) val: Rule set
   */
  private function expand($val) {
    $pos = 0;
    while (preg_match($this->rmpbase, $val, $match, PREG_OFFSET_CAPTURE, $pos)) {
      $replace = '';
      $prop = $match[2][0];
      $value = preg_split($this->rspace, trim($match[3][0]));
      $positions = array(
        'top' => 0,
        'right' => 0,
        'bottom' => 0,
        'left' => 0,
      );

      // Skip uncombinables
      if ($this->Combine
        ->checkUncombinables($value)) {
        $pos = $match[0][1] + strlen($match[0][0]);
        continue;
      }

      // Each position needs a value
      switch (count($value)) {
        case 1:
          $positions['top'] = $positions['right'] = $positions['bottom'] = $positions['left'] = $value[0];
          break;
        case 2:
          $positions['top'] = $positions['bottom'] = $value[0];
          $positions['right'] = $positions['left'] = $value[1];
          break;
        case 3:
          $positions['top'] = $value[0];
          $positions['right'] = $positions['left'] = $value[1];
          $positions['bottom'] = $value[2];
          break;
        case 4:
          $positions['top'] = $value[0];
          $positions['right'] = $value[1];
          $positions['bottom'] = $value[2];
          $positions['left'] = $value[3];
          break;
        default:
          continue;
      }

      // Build the replacement
      foreach ($positions as $p => $v) {
        $replace .= "{$prop}-{$p}:{$v};";
      }
      $colon = strlen($match[1][0]);
      $val = substr_replace($val, $replace, $match[0][1] + $colon, strlen($match[0][0]) - $colon);
      $pos = $match[0][1] + strlen($replace) - $colon - 1;
    }
    return $val;
  }

  /**
   * 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 MarginPadding Class - " . $method);
    }
  }

}

Classes

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