library/HTMLPurifier/AttrDef/CSS/Font.php

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<?php

class HTMLPurifier_AttrDef_CSS_Font extends HTMLPurifier_AttrDef
{
    
    protected $info = array();
    
    public function __construct($config) {
        $def = $config->getCSSDefinition();
        $this->info['font-style']   = $def->info['font-style'];
        $this->info['font-variant'] = $def->info['font-variant'];
        $this->info['font-weight']  = $def->info['font-weight'];
        $this->info['font-size']    = $def->info['font-size'];
        $this->info['line-height']  = $def->info['line-height'];
        $this->info['font-family']  = $def->info['font-family'];
    }
    
    public function validate($string, $config, $context) {
        
        static $system_fonts = array(
            'caption' => true,
            'icon' => true,
            'menu' => true,
            'message-box' => true,
            'small-caption' => true,
            'status-bar' => true
        );
        
        // regular pre-processing
        $string = $this->parseCDATA($string);
        if ($string === '') return false;
        
        // check if it's one of the keywords
        $lowercase_string = strtolower($string);
        if (isset($system_fonts[$lowercase_string])) {
            return $lowercase_string;
        }
        
        $bits = explode(' ', $string); // bits to process
        $stage = 0; // this indicates what we're looking for
        $caught = array(); // which stage 0 properties have we caught?
        $stage_1 = array('font-style', 'font-variant', 'font-weight');
        $final = ''; // output
        
        for ($i = 0, $size = count($bits); $i < $size; $i++) {
            if ($bits[$i] === '') continue;
            switch ($stage) {
                
                // attempting to catch font-style, font-variant or font-weight
                case 0:
                    foreach ($stage_1 as $validator_name) {
                        if (isset($caught[$validator_name])) continue;
                        $r = $this->info[$validator_name]->validate(
                                                $bits[$i], $config, $context);
                        if ($r !== false) {
                            $final .= $r . ' ';
                            $caught[$validator_name] = true;
                            break;
                        }
                    }
                    // all three caught, continue on
                    if (count($caught) >= 3) $stage = 1;
                    if ($r !== false) break;
                
                // attempting to catch font-size and perhaps line-height
                case 1:
                    $found_slash = false;
                    if (strpos($bits[$i], '/') !== false) {
                        list($font_size, $line_height) =
                                                    explode('/', $bits[$i]);
                        if ($line_height === '') {
                            // ooh, there's a space after the slash!
                            $line_height = false;
                            $found_slash = true;
                        }
                    } else {
                        $font_size = $bits[$i];
                        $line_height = false;
                    }
                    $r = $this->info['font-size']->validate(
                                              $font_size, $config, $context);
                    if ($r !== false) {
                        $final .= $r;
                        // attempt to catch line-height
                        if ($line_height === false) {
                            // we need to scroll forward
                            for ($j = $i + 1; $j < $size; $j++) {
                                if ($bits[$j] === '') continue;
                                if ($bits[$j] === '/') {
                                    if ($found_slash) {
                                        return false;
                                    } else {
                                        $found_slash = true;
                                        continue;
                                    }
                                }
                                $line_height = $bits[$j];
                                break;
                            }
                        } else {
                            // slash already found
                            $found_slash = true;
                            $j = $i;
                        }
                        if ($found_slash) {
                            $i = $j;
                            $r = $this->info['line-height']->validate(
                                              $line_height, $config, $context);
                            if ($r !== false) {
                                $final .= '/' . $r;
                            }
                        }
                        $final .= ' ';
                        $stage = 2;
                        break;
                    }
                    return false;
                
                // attempting to catch font-family
                case 2:
                    $font_family =
                        implode(' ', array_slice($bits, $i, $size - $i));
                    $r = $this->info['font-family']->validate(
                                              $font_family, $config, $context);
                    if ($r !== false) {
                        $final .= $r . ' ';
                        // processing completed successfully
                        return rtrim($final);
                    }
                    return false;
            }
        }
        return false;
    }
    
}

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