syntax.php

<?php
/**
 * Poll Plugin: allows to create simple polls
 *
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     Esther Brunner <wikidesign@gmail.com>  
 */
 
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_poll extends DokuWiki_Syntax_Plugin {

    function getType() { return 'substition';}
    function getPType() { return 'block';}
    function getSort() { return 167; }

    /**
     * Connect pattern to lexer
     */
    function connectTo($mode) {
        $this->Lexer->addSpecialPattern('<poll.*?>.+?</poll>', $mode, 'plugin_poll');
    }

    /**
     * Handle the match
     */
    function handle($match, $state, $pos, Doku_Handler $handler) {
        $match = substr($match, 6, -7);  // strip markup
        list($title, $options) = preg_split('/>/u', $match, 2);
        if (!$options) {
            $options = $title;
            $title   = NULL;
        }
        $options = explode('*', $options);

        $c = count($options);
        for ($i = 0; $i < $c; $i++) {
            $options[$i] = trim($options[$i]);
        }

        return array(trim($title), $options);
    }

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

        if ($mode == 'xhtml') {
            global $ID;

            $options = $data[1];
            $title   = $renderer->_xmlEntities($data[0]);

            // prevent caching to ensure the poll results are fresh
            $renderer->info['cache'] = false;

            // get poll file contents
            $pfile = metaFN(md5($title), '.poll');
            $poll  = unserialize(@file_get_contents($pfile));

            // output the poll
            $renderer->doc .= '<fieldset class="poll">'.
                '<legend>'.$title.'</legend>';
            $more = trim(array_shift($options));
            if ($more) {
                $renderer->doc .= '<div>'.$renderer->_xmlEntities($more).'</div>';
            }

            // check if user has voted already
            $ip = clientIP(true);
            if (isset($poll['ips']) && in_array($ip, $poll['ips'])) {

                // display results
                $renderer->doc .= $this->_pollResults($poll);

            } elseif ($vote = $_REQUEST['vote']) {

                // user has just voted -> update results
                $c = count($options);
                for ($i = 0; $i < $c; $i++) {
                    $opt = $renderer->_xmlEntities($options[$i]);
                    if ($vote == $opt) {
                        $poll['results'][$opt] += 1;
                        $poll['votes'] += 1;
                        $poll['ips'][] = $ip;
                    } elseif (!isset($poll['results'][$opt])) {
                        $poll['results'][$opt] = 0;
                    }
                }
                $fh = fopen($pfile, 'w');
                fwrite($fh, serialize($poll));
                fclose($fh);

                // display results
                $renderer->doc .= $this->_pollResults($poll);

            } elseif (count($options) > 0) {

                // display poll form
                $renderer->doc .= $this->_pollForm($options, $renderer);

            } else {

                // display results
                $renderer->doc .= $this->_pollResults($poll);

            }
            $renderer->doc .= '</fieldset>';

            return true;
        }
        return false;
    }

    function _pollResults($poll) {
        $total = $poll['votes'];
        if ($total == 0) return '';

        $ret = '<table class="blind">';
        $c = count($poll['results']);
        $options = array_keys($poll['results']);
        $votes   = array_values($poll['results']);
        for ($i = 0; $i < $c; $i++) {
            $absolute = $votes[$i];
            $percent  = round(($absolute*100)/$total);
            $ret .= '<tr><td>'.$options[$i].'</td><td><div class="poll_bar">';
            if ($percent) $ret .= '<div class="poll_full" style="width:'.($percent*2).'px">&nbsp;</div>';
            $ret .= '</div></td><td class="rightalign">'.$percent.'%</td>'.
                '<td class="rightalign">('.$absolute.')</td></tr>';
        }
        $ret .= '</table>';

        return $ret;
    }

    function _pollForm($options, &$renderer) {
        global $lang;
        global $ID;

        $i = 0;
        $ret = '<form id="poll__form" method="post" action="'.script().'" accept-charset="'.$lang['encoding'].'"><div class="no">'.
            '<input type="hidden" name="do" value="show" />'.
            '<input type="hidden" name="id" value="'.$ID.'" />';
        foreach ($options as $option) {
            $i++;
            $option = $renderer->_xmlEntities($option);
            $ret.= '<label class="simple" for="poll__option'.$i.'">'.
                '<input type="radio" name="vote" id="poll__option'.$i.'" '.
                'value="'.$option.'" /> <span>'.$option.'</span></label>';
        }
        $ret .= '<input class="button" type="submit" '.
            'value="'.$this->getLang('btn_vote').'" />'.
            '</div></form>';

        return $ret;
    }
}
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