<?php

require_once 'classes/LightPressPlugin.php';

class GeshiHighlighter extends LightPressPlugin {

    var $default_context = LP_CONTEXT_POST;
    var $active = true;
    var $hooks = array('parse_post');

    var $description = 'Formats code with Geshi.';
    var $constructor_args = array(
        'code_tag' => 'Tag that triggers Geshi',
        'code_class' =>      'Class name for the Geshi tag',
        'geshi_path' => 'Location where Geshi is installed'
        );
    
    var $_frontend;
	
    // options
	var $code_tag = 'pre';
	var $code_class = 'geshi';
    var $geshi_path;
    
    var $_geshi_re;
    
    function GeshiHighlighter(&$frontend, $args, $dummy_run=false) {
		$this->LightPressPlugin($frontend, $args, $dummy_run);
        if (!$dummy_run) {
            if (!isset($this->geshi_path))
                $this->geshi_path = implode(DIRECTORY_SEPARATOR, array($frontend->options['basedir'], 'plugins', 'geshi'));
            $geshi_class_path = implode(DIRECTORY_SEPARATOR, array($this->geshi_path, 'geshi.php'));
            if (!is_file($geshi_class_path))
                $this->active = false;
            else if (!include_once($geshi_class_path))
                $this->active = false;
            if ($this->active)
                $this->_geshi_re = '/(<' . $this->code_tag . '[^>]*class="([^"]*)"[^>]*>)(.*?)(<\/' . $this->code_tag . '>)/ims';
        }
    }
    
    function _geshi($matches) {
        //$g =& new Geshi();
        // 0 is the full match
        // 1 is the full open tag
        // 2 are the css classes
        // 3 is the code
        // 4 is the close tag
        $classes = explode(' ', $matches[2]);
        $found = false;
        foreach ($classes as $k=>$v) {
            if ($v == $this->code_class) {
                $found = true;
                unset($classes[$k]);
            }
        }
        if (!$found || count($classes) == 0)
            return $matches[0];
        $lang = array_shift($classes);
        $g =& new Geshi($matches[3], $lang);
        // TODO: make the following configurable by the user
        //$g->enable_line_numbers(GESHI_NORMAL_LINE_NUMBERS);
        return $g->parse_code();
    }
        
    function run($hook, &$post) {
        if (!$this->active)
            return ($this->hide());
        $post['post_content'] = preg_replace_callback($this->_geshi_re, array(&$this, '_geshi'), $post['post_content']);
        if (isset($post['more']) && $post['more'])
            $post['post_more'] = preg_replace_callback($this->_geshi_re, array(&$this, '_geshi'), $post['post_more']);
    }
    
	function hide() {
    }
}

?>