library/HTMLPurifier/DoctypeRegistry.php

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<?php

class HTMLPurifier_DoctypeRegistry
{
    
    protected $doctypes;
    
    protected $aliases;
    
    public function register($doctype, $xml = true, $modules = array(),
        $tidy_modules = array(), $aliases = array(), $dtd_public = null, $dtd_system = null
    ) {
        if (!is_array($modules)) $modules = array($modules);
        if (!is_array($tidy_modules)) $tidy_modules = array($tidy_modules);
        if (!is_array($aliases)) $aliases = array($aliases);
        if (!is_object($doctype)) {
            $doctype = new HTMLPurifier_Doctype(
                $doctype, $xml, $modules, $tidy_modules, $aliases, $dtd_public, $dtd_system
            );
        }
        $this->doctypes[$doctype->name] = $doctype;
        $name = $doctype->name;
        // hookup aliases
        foreach ($doctype->aliases as $alias) {
            if (isset($this->doctypes[$alias])) continue;
            $this->aliases[$alias] = $name;
        }
        // remove old aliases
        if (isset($this->aliases[$name])) unset($this->aliases[$name]);
        return $doctype;
    }
    
    public function get($doctype) {
        if (isset($this->aliases[$doctype])) $doctype = $this->aliases[$doctype];
        if (!isset($this->doctypes[$doctype])) {
            trigger_error('Doctype ' . htmlspecialchars($doctype) . ' does not exist', E_USER_ERROR);
            $anon = new HTMLPurifier_Doctype($doctype);
            return $anon;
        }
        return $this->doctypes[$doctype];
    }
    
    public function make($config) {
        return clone $this->get($this->getDoctypeFromConfig($config));
    }
    
    public function getDoctypeFromConfig($config) {
        // recommended test
        $doctype = $config->get('HTML', 'Doctype');
        if (!empty($doctype)) return $doctype;
        $doctype = $config->get('HTML', 'CustomDoctype');
        if (!empty($doctype)) return $doctype;
        // backwards-compatibility
        if ($config->get('HTML', 'XHTML')) {
            $doctype = 'XHTML 1.0';
        } else {
            $doctype = 'HTML 4.01';
        }
        if ($config->get('HTML', 'Strict')) {
            $doctype .= ' Strict';
        } else {
            $doctype .= ' Transitional';
        }
        return $doctype;
    }
    
}

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