<?php
/**
 * Box Plugin: Draw highlighting boxes around wiki markup
 *
 * Syntax:     <box width% classes|title>
 *   width%    width of the box, must use % unit
 *   classes   one or more classes used to style the box, several predefined styles included in style.css
 *   title     (optional) all text after '|' will be rendered above the main code text with a
 *             different style.
 *
 * Acknowledgements:
 *  Rounded corners based on snazzy borders by Stu Nicholls (http://www.cssplay.co.uk/boxes/snazzy) 
 *  which is in turn based on nifty corners by Alessandro Fulciniti (http://pro.html.it/esempio/nifty/)
 * 
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     Christopher Smith <chris@jalakai.co.uk>  
 */

if(!defined('DOKU_INC')) define('DOKU_INC',realpath(dirname(__FILE__).'/../../').'/');
if(!defined('DOKU_PLUGIN')) define('DOKU_PLUGIN',DOKU_INC.'lib/plugins/');
require_once(DOKU_PLUGIN.'syntax.php');

/**
 * All DokuWiki plugins to extend the parser/rendering mechanism
 * need to inherit from this class
 */
class syntax_plugin_box extends DokuWiki_Syntax_Plugin {

    var $title_mode = false;

    // the following are used in rendering and are set by _xhtml_boxopen()
    var $_xb_colours      = '';
    var $_content_colours = '';
    var $_title_colours   = '';

    function getType(){ return 'protected';}
    function getAllowedTypes() { return array('container','substition','protected','disabled','formatting','paragraphs'); }
    function getPType(){ return 'block';}

    // must return a number lower than returned by native 'code' mode (200)
    function getSort(){ return 195; }

    // override default accepts() method to allow nesting 
    // - ie, to get the plugin accepts its own entry syntax
    function accepts($mode) {
        if ($mode == substr(get_class($this), 7)) return true;

        return parent::accepts($mode);
    }

    /**
     * Connect pattern to lexer
     */
    function connectTo($mode) {       
      $this->Lexer->addEntryPattern('<box>(?=.*?</box.*?>)',$mode,'plugin_box');
      $this->Lexer->addEntryPattern('<box\s[^\r\n\|]*?>(?=.*?</box.*?>)',$mode,'plugin_box');
      $this->Lexer->addEntryPattern('<box\|(?=[^\r\n]*?\>.*?</box.*?\>)',$mode,'plugin_box');      
      $this->Lexer->addEntryPattern('<box\s[^\r\n\|]*?\|(?=[^\r\n]*?>.*?</box.*?>)',$mode,'plugin_box');      
    }

    function postConnect() {
      $this->Lexer->addPattern('>', 'plugin_box');
      $this->Lexer->addExitPattern('</box.*?>', 'plugin_box');
    }

    /**
     * Handle the match
     */
    function handle($match, $state, $pos, Doku_Handler $handler){

        switch ($state) {
            case DOKU_LEXER_ENTER:
                $data = $this->_boxstyle(trim(substr($match, 4, -1)));
                if (substr($match, -1) == '|') {
                    $this->title_mode = true;
                    return array('title_open',$data);
                } else {
                    return array('box_open',$data);
                }

            case DOKU_LEXER_MATCHED:
                if ($this->title_mode) {
                    $this->title_mode = false;
                    return array('box_open','');
                } else {
                    return array('data', $match);
                }

            case DOKU_LEXER_UNMATCHED:                
                $handler->_addCall('cdata',array($match), $pos);
                return false;

            case DOKU_LEXER_EXIT:
                $data = trim(substr($match, 5, -1));
                $title =  ($data && $data{0} == "|") ? substr($data,1) : '';

                return array('box_close', $title);

        }       
        return false;
    }

    /**
     * Create output
     */
    function render($mode, Doku_Renderer $renderer, $indata) {

      if (empty($indata)) return false;
      list($instr, $data) = $indata;

      if($mode == 'xhtml'){
          switch ($instr) {
          case 'title_open' : 
            $this->title_mode = true;
            $renderer->doc .= $this->_xhtml_boxopen($data)."<p class='box_title' {$this->_title_colours}>";
            break;

          case 'box_open' :   
            if ($this->title_mode) {
              $this->title_mode = false;
              $renderer->doc .= "</p>\n<div class='box_content' {$this->_content_colours}>";
            } else {
              $renderer->doc .= $this->_xhtml_boxopen($data)."<div class='box_content' {$this->_content_colours}>";
            }
            break;

          case 'data' :      
            $renderer->doc .= $renderer->_xmlEntities($data); 
            break;

          case 'box_close' : 
            $renderer->doc .= "</div>\n";

            if ($data) { 
              $renderer->doc .= "<p class='box_caption' {$this->_title_colours}>".$renderer->_xmlEntities($data)."</p>\n";
            }
            $renderer->doc .= $this->_xhtml_boxclose(); 
            break;
        }

        return true;
      }
      return false;
    }

    function _boxstyle($str) {
      if (!strlen($str)) return array();

      $styles = array();

      $tokens = preg_split('/\s+/', $str, 9);                      // limit is defensive
      foreach ($tokens as $token) {
          if (preg_match('/^\d*\.?\d+(%|px|em|ex|pt|cm|mm|pi|in)$/', $token)) {
            $styles['width'] = $token;
            continue;
          }

          if (preg_match('/^(
              (\#([0-9a-fA-F]{3}|[0-9a-fA-F]{6}))|        #colorvalue
              (rgb\(([0-9]{1,3}%?,){2}[0-9]{1,3}%?\))     #rgb triplet
              )$/x', $token)) {
            $styles['colour'][] = $token;
            continue;
          }

          // restrict token (class names) characters to prevent any malicious data
          if (preg_match('/[^A-Za-z0-9_-]/',$token)) continue;
          $styles['class'] = (isset($styles['class']) ? $styles['class'].' ' : '').$token;
      }
      if (!empty($styles['colour'])) {
        $styles['colour'] = $this->_box_colours($styles['colour']);
      }

      return $styles;
    }

    function _box_colours($colours) {
      $triplets = array();

      // only need the first four colours
      if (count($colours) > 4) $colours = array_slice($colours,0,4);
      foreach ($colours as $colour) {
        $triplet[] = $this->_colourToTriplet($colour);
      }

      // there must be one colour to get here - the primary background
      // calculate title background colour if not present
      if (empty($triplet[1])) {
        $triplet[1] = $triplet[0];
      }

      // calculate outer background colour if not present
      if (empty($triplet[2])) {
        $triplet[2] = $triplet[0];
      }

      // calculate border colour if not present
      if (empty($triplet[3])) {
        $triplet[3] = $triplet[0];
      }

      // convert triplets back to style sheet colours
      $style_colours['content_background'] = 'rgb('.join(',',$triplet[0]).')';
      $style_colours['title_background'] = 'rgb('.join(',',$triplet[1]).')';
      $style_colours['outer_background'] = 'rgb('.join(',',$triplet[2]).')';
      $style_colours['borders'] = 'rgb('.join(',',$triplet[3]).')';

      return $style_colours;
    }

    function _colourToTriplet($colour) {
      if ($colour{0} == '#') {
        if (strlen($colour) == 4) {
          // format #FFF
          return array(hexdec($colour{1}.$colour{1}),hexdec($colour{2}.$colour{2}),hexdec($colour{3}.$colour{3}));
        } else {
          // format #FFFFFF
          return array(hexdec(substr($colour,1,2)),hexdec(substr($colour,3,2)), hexdec(substr($colour,5,2)));
        }
      } else {
        // format rgb(x,y,z)
        return explode(',',substr($colour,4,-1));
      }
    }

    function _xhtml_boxopen($styles) {
      $class = 'class="box' . (isset($styles['class']) ? ' '.$styles['class'] : '') . '"';
      $style = isset($styles['width']) ? "width: {$styles['width']};" : '';

      if (isset($styles['colour'])) {
        $colours = 'background-color: '.$styles['colour']['outer_background'].'; ';
        $colours .= 'border-color: '.$styles['colour']['borders'].';';

        $this->_content_colours = 'style="background-color: '.$styles['colour']['content_background'].'; border-color: '.$styles['colour']['borders'].'"';
        $this->_title_colours = 'style="background-color: '.$styles['colour']['title_background'].';"';

      } else {
        $colours = '';

        $this->_content_colours = '';
        $this->_title_colours = '';
      }

      if ($style || $colours) $style = ' style="'.$style.' '.$colours.'"';
      if ($colours) $colours = ' style="'.$colours.'"';

      $this->_xb_colours = $colours;

      $html = "<div $class$style>\n";
      $html .="  <b class='xtop'><b class='xb1'$colours></b><b class='xb2'$colours></b><b class='xb3'$colours></b><b class='xb4'$colours></b></b>\n";
      $html .="  <div class='xbox'$colours>\n";

      return $html;
    }

    function _xhtml_boxclose() {

      $colours = $this->_xb_colours;

      $html = "  </div>\n";
      $html .= "  <b class='xbottom'><b class='xb4'$colours></b><b class='xb3'$colours></b><b class='xb2'$colours></b><b class='xb1'$colours></b></b>\n";
      $html .= "</div>\n";

      return $html;
    }

}

//Setup VIM: ex: et ts=4 enc=utf-8 :