class CSSCompression_Selectors in Advanced CSS/JS Aggregation 7

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

Hierarchy

• class \CSSCompression_Selectors

File

advagg_css_compress/css-compressor-3.x/src/lib/Selectors.inc, line 8

class CSSCompression_Selectors {

  /**
   * Selector patterns
   *
   * @class Control: Compression Controller
   * @param (string) token: Copy of the injection token
   * @param (regex) ridattr: ID Attribute matcher (combined with token)
   * @param (regex) rclassattr: class Attribute matcher (combined with token)
   * @param (array) options: Reference to options
   * @param (regex) rmark: Stop points during selector parsing
   * @param (regex) ridclassend: End of a id/class string
   * @param (regex) rescapedspace: for replacement in class attributes
   * @param (regex) rquote: Checks for the next quote character
   * @param (regex) rcomma: looks for an unescaped comma character
   * @param (regex) rspace: looks for an unescaped space character
   * @param (regex) rid: looks for an unescaped hash character
   * @param (regex) rpseudo: Add space after first-letter|line pseudo selector
   * --- when it occurs before comma or rule set
   */
  private $Control;
  private $token = '';
  private $ridattr = "";
  private $rclassattr = "";
  private $options = array();
  private $rmark = "/(?<!\\\\)(#|\\.|=)/";
  private $ridclassend = "/(?<!\\\\)[:#>~\\[\\+\\*\\. ]/";
  private $rquote = "/(?<!\\\\)(\"|')?\\]/";
  private $rescapedspace = "/\\\\ /";
  private $rcomma = "/(?<!\\\\),/";
  private $rspace = "/(?<!\\\\)\\s/";
  private $rid = "/(?<!\\\\)#/";
  private $rpseudo = "/:first-(letter|line)(,|\$)/i";

  /**
   * Stash a reference to the controller on each instantiation
   *
   * @param (class) control: CSSCompression Controller
   */
  public function __construct(CSSCompression_Control $control) {
    $this->Control = $control;
    $this->token = CSSCompression::TOKEN;
    $this->ridattr = "/\\[id={$this->token}(.*?){$this->token}\\]/";
    $this->rclassattr = "/\\[class={$this->token}(.*?){$this->token}\\]/";
    $this->options =& $control->Option->options;
  }

  /**
   * Selector specific optimizations
   *
   * @param (array) selectors: Array of selectors
   */
  public function selectors(&$selectors = array()) {
    foreach ($selectors as &$selector) {

      // Auto ignore sections
      if (strpos($selector, $this->token) === 0) {
        continue;
      }

      // Smart casing and token injection
      $selector = $this
        ->parse($selector);

      // Converting attr to shorthanded selectors
      if ($this->options['attr2selector']) {

        // Use id hash instead of id attr
        $selector = $this
          ->idAttribute($selector);

        // Use class notation instead of class attr
        $selector = $this
          ->classAttribute($selector);
      }

      // Remove everything before final id in a selector
      if ($this->options['strict-id']) {
        $selector = $this
          ->strictid($selector);
      }

      // Get rid of possible repeated selectors
      $selector = $this
        ->repeats($selector);

      // Add space after pseudo selectors (so ie6 doesn't complain)
      if ($this->options['pseudo-space']) {
        $selector = $this
          ->pseudoSpace($selector);
      }
    }
    return $selectors;
  }

  /**
   * Converts selectors like BODY => body, DIV => div
   * and injects tokens wrappers for attribute values
   *
   * @param (string) selector: CSS Selector
   */
  private function parse($selector) {
    $clean = '';
    $substr = '';
    $pos = 0;
    while (preg_match($this->rmark, $selector, $match, PREG_OFFSET_CAPTURE, $pos)) {
      $substr = substr($selector, $pos, $match[0][1] + 1 - $pos);
      $clean .= $this->options['lowercase-selectors'] ? strtolower($substr) : $substr;
      $pos = $match[0][1] + strlen($match[1][0]);

      // Class or id match
      if ($match[1][0] == '#' || $match[1][0] == '.') {
        if (preg_match($this->ridclassend, $selector, $m, PREG_OFFSET_CAPTURE, $pos)) {
          $clean .= substr($selector, $pos, $m[0][1] - $pos);
          $pos = $m[0][1];
        }
        else {
          $clean .= substr($selector, $pos);
          $pos = strlen($selector);
          break;
        }
      }
      else {
        if (preg_match($this->rquote, $selector, $m, PREG_OFFSET_CAPTURE, $pos)) {
          if ($selector[$pos] == "\"" || $selector[$pos] == "'") {
            $pos++;
          }
          $clean .= $this->token . substr($selector, $pos, $m[0][1] - $pos) . $this->token . ']';
          $pos = $m[0][1] + strlen($m[0][0]);
        }
        else {
          $clean .= substr($selector, $pos);
          $pos = strlen($selector);
          break;
        }
      }
    }
    return $clean . ($this->options['lowercase-selectors'] ? strtolower(substr($selector, $pos)) : substr($selector, $pos));
  }

  /**
   * Convert [id=blah] attribute selectors into id form selector (#blah)
   *
   * @param (string) selector: CSS Selector
   */
  private function idAttribute($selector) {
    $pos = 0;
    while (preg_match($this->ridattr, $selector, $match, PREG_OFFSET_CAPTURE, $pos)) {

      // Don't convert if space found (not valid hash selector)
      if (strpos($match[1][0], ' ') !== false) {
        $pos = $match[0][1] + strlen($match[0][0]);
        continue;
      }
      $selector = substr_replace($selector, '#' . $match[1][0], $match[0][1], strlen($match[0][0]));
      $pos = $match[0][1] + strlen($match[1][0]) + 1;
    }
    return $selector;
  }

  /**
   * Convert [class=blah] attribute selectors into class form selector (.blah)
   *
   * @param (string) selector: CSS Selector
   */
  private function classAttribute($selector) {
    $pos = 0;
    while (preg_match($this->rclassattr, $selector, $match, PREG_OFFSET_CAPTURE, $pos)) {

      // Don't convert if prescense of dot separator found
      if (strpos($match[1][0], '.') !== false) {
        $pos = $match[0][1] + strlen($match[0][0]);
        continue;
      }
      $replace = '.' . preg_replace($this->rescapedspace, ".", $match[1][0]);
      $selector = substr_replace($selector, $replace, $match[0][1], strlen($match[0][0]));
      $pos = $match[0][1] + strlen($match[1][0]) + 1;
    }
    return $selector;
  }

  /**
   * Promotes nested id's to the front of the selector
   *
   * @param (string) selector: CSS Selector
   */
  private function strictid($selector) {
    $parts = preg_split($this->rcomma, $selector);
    foreach ($parts as &$s) {
      if (preg_match($this->rid, $s)) {
        $p = preg_split($this->rid, $s);
        $s = '#' . array_pop($p);
      }
    }
    return implode(',', $parts);
  }

  /**
   * Removes repeated selectors that have been comma separated
   *
   * @param (string) selector: CSS Selector
   */
  private function repeats($selector) {
    $parts = preg_split($this->rcomma, $selector);
    $parts = array_flip($parts);
    $parts = array_flip($parts);
    return implode(',', $parts);
  }

  /**
   * Adds space after pseudo selector for ie6 like a:first-child{ => a:first-child {
   *
   * @param (string) selector: CSS Selector
   */
  private function pseudoSpace($selector) {
    return preg_replace($this->rpseudo, ":first-\$1 \$2", $selector);
  }

  /**
   * 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, $method)) {
      if ($method == 'selectors') {
        return $this
          ->selectors($args[0]);
      }
      else {
        return call_user_func_array(array(
          $this,
          $method,
        ), $args);
      }
    }
    else {
      throw new CSSCompression_Exception("Unknown method in Selectors Class - " . $method);
    }
  }

}

Members

Name	Modifiers	Type	Description	Overrides
CSSCompression_Selectors::$Control	private	property	Selector patterns
CSSCompression_Selectors::$options	private	property
CSSCompression_Selectors::$rclassattr	private	property
CSSCompression_Selectors::$rcomma	private	property
CSSCompression_Selectors::$rescapedspace	private	property
CSSCompression_Selectors::$rid	private	property
CSSCompression_Selectors::$ridattr	private	property
CSSCompression_Selectors::$ridclassend	private	property
CSSCompression_Selectors::$rmark	private	property
CSSCompression_Selectors::$rpseudo	private	property
CSSCompression_Selectors::$rquote	private	property
CSSCompression_Selectors::$rspace	private	property
CSSCompression_Selectors::$token	private	property
CSSCompression_Selectors::access	public	function	Access to private methods for testing
CSSCompression_Selectors::classAttribute	private	function	Convert [class=blah] attribute selectors into class form selector (.blah)
CSSCompression_Selectors::idAttribute	private	function	Convert [id=blah] attribute selectors into id form selector (#blah)
CSSCompression_Selectors::parse	private	function	Converts selectors like BODY => body, DIV => div and injects tokens wrappers for attribute values
CSSCompression_Selectors::pseudoSpace	private	function	Adds space after pseudo selector for ie6 like a:first-child{ => a:first-child {
CSSCompression_Selectors::repeats	private	function	Removes repeated selectors that have been comma separated
CSSCompression_Selectors::selectors	public	function	Selector specific optimizations
CSSCompression_Selectors::strictid	private	function	Promotes nested id's to the front of the selector
CSSCompression_Selectors::__construct	public	function	Stash a reference to the controller on each instantiation