Individuals.inc

<?php


/**
 * CSS Compressor [VERSION]
 * [DATE]
 * Corey Hart @ http://www.codenothing.com
 */
class CSSCompression_Individuals {
    
    /**
     * Individual patterns
     *
     * @class Control: Compression Controller
     * @class Numeric: Numeric handler
     * @class Color: Color Handler
     * @param (array) options: Reference to options
     * @param (regex) rdirectional: Properties that may have multiple directions
     * @param (regex) rborderradius: Checks property for border-radius declaration
     * @param (regex) rnoneprop: Properties that can have none as their value(will be converted to 0)
     * @param (regex) rclip: Looks for rect grouping in clip declaration
     * @param (regex) rsplitter: Checks font properties for font-size/line-height split
     * @param (regex) rfilter: Special alpha filter for msie
     * @param (regex) rspace: Checks for unescaped space
     * @param (regex) rspace: Checks for unescaped slash
     * @param (array) weights: Array of font-weight name conversions to their numeric counterpart
     */
    private $Control;
    private $Numeric;
    private $Color;
    private $options = array();
    private $rdirectional = "/^(margin|padding|border-spacing)\$/";
    private $rborderradius = "/border[a-z-]*radius/";
    private $rradiusfull = "/^(-moz-|-webkit-)?border-radius\$/";
    private $rnoneprop = "/^(border|background|border-(top|right|bottom|left))\$/";
    private $rclip = "/^rect\\(\\s*(\\-?\\d*\\.?\\d*?\\w*)(,|\\s)(\\-?\\d*\\.?\\d*?\\w*)(,|\\s)(\\-?\\d*\\.?\\d*?\\w*)(,|\\s)(\\-?\\d*\\.?\\d*?\\w*)\\s*\\)\$/";
    private $rsplitter = "/(^|(?<!\\\\)\\s)([^\\/ ]+)\\/([^\\/ ]+)((?<!\\\\)\\s|\$)/";
    private $rfilter = "/[\"']?PROGID\\\\?:DXImageTransform\\\\?.Microsoft\\\\?.Alpha\\(Opacity\\\\?=(\\d+\\\\?\\.?\\d*)\\)[\"']?/i";
    private $rspace = "/(?<!\\\\)\\s/";
    private $rslash = "/(?<!\\\\)\\//";
    private $weights = array(
        "normal" => 400,
        "bold" => 700,
    );
    
    /**
     * Stash a reference to the controller on each instantiation
     *
     * @param (class) control: CSSCompression Controller
     */
    public function __construct(CSSCompression_Control $control) {
        $this->Control = $control;
        $this->Numeric = $control->Numeric;
        $this->Color = $control->Color;
        $this->options =& $control->Option->options;
    }
    
    /**
     * Runs special unit/directional compressions
     *
     * @param (string) prop: CSS Property
     * @param (string) val: Value of CSS Property
     */
    public function individuals($prop, $val) {
        // Properties should always be lowercase
        $prop = strtolower($prop);
        // Split up each definiton for color and numeric compressions
        $parts = preg_split($this->rspace, $val);
        foreach ($parts as &$v) {
            if (!$v || $v == '') {
                continue;
            }
            // Remove uneeded decimals/units
            if ($this->options['format-units']) {
                $v = $this->Numeric
                    ->numeric($v);
            }
            // Color compression
            $v = $this->Color
                ->color($v);
        }
        $val = trim(implode(' ', $parts));
        // Special border radius handling
        if (preg_match($this->rborderradius, $prop)) {
            $val = $this->borderRadius($prop, $val);
        }
        else {
            if ($this->options['directional-compress'] && count($parts) > 1 && preg_match($this->rdirectional, $prop)) {
                $val = $this->directionals(strtolower($val));
            }
        }
        // Font-weight converter
        if ($this->options['fontweight2num'] && ($prop == 'font-weight' || $prop == 'font')) {
            $val = $this->fontweight($val);
        }
        // Special font value conversions
        if ($prop == 'font') {
            $val = $this->font($val);
        }
        // Special clip value compressions
        if ($prop == 'clip') {
            $val = $this->clip($val);
        }
        // None to 0 converter
        $val = $this->none($prop, $val);
        // MSIE Filters
        $val = $this->filter($prop, $val);
        // Return for list retrival
        return array(
            $prop,
            $val,
        );
    }
    
    /**
     * Preps border radius for directional compression
     *
     * @param (string) prop: Property Declaration
     * @param (string) val: Declaration Value
     */
    private function borderRadius($prop, $val) {
        if (preg_match($this->rslash, $val)) {
            $parts = preg_split($this->rslash, $val, 2);
            // We have to redo numeric compression because the slash may hav intruded
            foreach ($parts as &$row) {
                $p = preg_split($this->rspace, $row);
                foreach ($p as &$v) {
                    if (!$v || $v == '') {
                        continue;
                    }
                    // Remove uneeded decimals/units
                    if ($this->options['format-units']) {
                        $v = $this->Numeric
                            ->numeric($v);
                    }
                }
                $row = implode(' ', $p);
                if ($this->options['directional-compress']) {
                    $row = $this->directionals(strtolower($row));
                }
            }
            $val = implode('/', $parts);
        }
        else {
            if ($this->options['directional-compress'] && preg_match($this->rradiusfull, $prop)) {
                $val = $this->directionals(strtolower($val));
            }
        }
        return $val;
    }
    
    /**
     * Finds directional compression on methods like margin/padding
     *
     * @param (string) val: Value of CSS Property
     */
    private function directionals($val) {
        // Split up each definiton
        $direction = preg_split($this->rspace, $val);
        // 4 Direction reduction
        $count = count($direction);
        if ($count == 4) {
            // All 4 sides are the same, combine into 1 definition
            if ($direction[0] == $direction[1] && $direction[2] == $direction[3] && $direction[0] == $direction[3]) {
                $direction = array(
                    $direction[0],
                );
            }
            else {
                if ($direction[0] == $direction[2] && $direction[1] == $direction[3]) {
                    $direction = array(
                        $direction[0],
                        $direction[1],
                    );
                }
                else {
                    if ($direction[1] == $direction[3]) {
                        $direction = array(
                            $direction[0],
                            $direction[1],
                            $direction[2],
                        );
                    }
                }
            }
        }
        else {
            if ($count == 3) {
                // All directions are the same
                if ($direction[0] == $direction[1] && $direction[1] == $direction[2]) {
                    $direction = array(
                        $direction[0],
                    );
                }
                else {
                    if ($direction[0] == $direction[2]) {
                        $direction = array(
                            $direction[0],
                            $direction[1],
                        );
                    }
                }
            }
            else {
                if ($count == 2 && $direction[0] == $direction[1]) {
                    $direction = array(
                        $direction[0],
                    );
                }
            }
        }
        // Return the combined version of the directions
        // Single entries will just return
        return implode(' ', $direction);
    }
    
    /**
     * Converts font-weight names to numbers
     *
     * @param (string) val: font-weight prop value
     */
    private function fontweight($val) {
        if (preg_match($this->rspace, $val)) {
            $parts = preg_split($this->rspace, $val);
            foreach ($parts as &$item) {
                $lower = strtolower($item);
                if (isset($this->weights[$lower]) && $lower != 'normal') {
                    $item = $this->weights[$lower];
                }
            }
            $val = implode(' ', $parts);
        }
        else {
            if (isset($this->weights[strtolower($val)])) {
                $val = $this->weights[strtolower($val)];
            }
        }
        return $val;
    }
    
    /**
     * Special font conversions
     *
     * @param (string) val: property value
     */
    private function font($val) {
        // Split out the font-size/line-height split and run through numerical handlers
        if (preg_match($this->rsplitter, $val, $match, PREG_OFFSET_CAPTURE)) {
            $size = $this->Numeric
                ->numeric($match[2][0]);
            $height = $this->Numeric
                ->numeric($match[3][0]);
            $concat = $match[1][0] . $size . '/' . $height . $match[4][0];
            $val = substr_replace($val, $concat, $match[0][1], strlen($match[0][0]));
        }
        return $val;
    }
    
    /**
     * Special clip conversions
     *
     * @param (string) val: property value
     */
    private function clip($val) {
        if (preg_match($this->rclip, $val, $match)) {
            $positions = array(
                1,
                3,
                5,
                7,
            );
            $clean = 'rect(';
            foreach ($positions as $pos) {
                if (!isset($match[$pos])) {
                    return $val;
                }
                $clean .= $this->Numeric
                    ->numeric($match[$pos]) . (isset($match[$pos + 1]) ? $match[$pos + 1] : '');
            }
            $val = $clean . ')';
        }
        return $val;
    }
    
    /**
     * Convert none vals to 0
     *
     * @param (string) prop: Current Property
     * @param (string) val: property value
     */
    private function none($prop, $val) {
        if (preg_match($this->rnoneprop, $prop) && $val == 'none') {
            $val = '0';
        }
        return $val;
    }
    
    /**
     * MSIE Filter Conversion
     *
     * @param (string) prop: Current Property
     * @param (string) val: property value
     */
    private function filter($prop, $val) {
        if (preg_match("/filter/", $prop)) {
            $val = preg_replace($this->rfilter, "alpha(opacity=\$1)", $val);
        }
        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 Individuals Class - " . $method);
        }
    }

}