includes/wikiengine/Parse/Default/Blockquote.php
author Dan
Mon, 02 Mar 2009 16:46:10 -0500
changeset 851 b98798f6572d
parent 1 fe660c52c48f
permissions -rw-r--r--
Redesigned installer sysreqs page to cover more features, be more comprehensive, and look better
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<?php
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/**
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* 
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* Parse for block-quoted text.
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* 
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* @category Text
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* 
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* @package Text_Wiki
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* 
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* @author Paul M. Jones <pmjones@php.net>
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* 
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* @license LGPL
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* 
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* @version $Id: Blockquote.php,v 1.3 2005/02/23 17:38:29 pmjones Exp $
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* 
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*/
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/**
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* 
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* Parse for block-quoted text.
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* 
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* Find source text marked as a blockquote, identified by any number of
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* greater-than signs '>' at the start of the line, followed by a space,
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* and then the quote text; each '>' indicates an additional level of
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* quoting.
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* 
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* @category Text
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* 
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* @package Text_Wiki
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* 
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* @author Paul M. Jones <pmjones@php.net>
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* 
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*/
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class Text_Wiki_Parse_Blockquote extends Text_Wiki_Parse {
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    /**
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    * 
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    * Regex for parsing the source text.
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    * 
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    * @access public
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    * 
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    * @var string
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    * 
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    * @see parse()
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    * 
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    */
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    var $regex = '/\n((\>).*\n)(?!(\>))/Us';
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    /**
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    * 
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    * Generates a replacement for the matched text.
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    * 
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    * Token options are:
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    * 
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    * 'type' =>
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    *     'start' : the start of a blockquote
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    *     'end'   : the end of a blockquote
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    *
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    * 'level' => the indent level (0 for the first level, 1 for the
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    * second, etc)
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    * 
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    * @access public
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    *
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    * @param array &$matches The array of matches from parse().
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    *
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    * @return A series of text and delimited tokens marking the different
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    * list text and list elements.
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    *
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    */
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    function process(&$matches)
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    {
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        // the replacement text we will return to parse()
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        $return = '';
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        // the list of post-processing matches
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        $list = array();
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        // $matches[1] is the text matched as a list set by parse();
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        // create an array called $list that contains a new set of
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        // matches for the various list-item elements.
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        preg_match_all(
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            '=^(\>+) (.*\n)=Ums',
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            $matches[1],
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            $list,
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            PREG_SET_ORDER
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        );
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        // a stack of starts and ends; we keep this so that we know what
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        // indent level we're at.
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        $stack = array();
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        // loop through each list-item element.
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        foreach ($list as $key => $val) {
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            // $val[0] is the full matched list-item line
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            // $val[1] is the number of initial '>' chars (indent level)
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            // $val[2] is the quote text
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            // we number levels starting at 1, not zero
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            $level = strlen($val[1]);
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            // get the text of the line
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            $text = $val[2];
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            // add a level to the list?
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            while ($level > count($stack)) {
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                // the current indent level is greater than the number
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                // of stack elements, so we must be starting a new
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                // level.  push the new level onto the stack with a 
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                // dummy value (boolean true)...
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                array_push($stack, true);
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                $return .= "\n";
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                // ...and add a start token to the return.
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                $return .= $this->wiki->addToken(
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                    $this->rule, 
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                    array(
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                        'type' => 'start',
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                        'level' => $level - 1
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                    )
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                );
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                $return .= "\n\n";
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            }
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            // remove a level?
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            while (count($stack) > $level) {
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                // as long as the stack count is greater than the
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                // current indent level, we need to end list types.
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                // continue adding end-list tokens until the stack count
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                // and the indent level are the same.
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                array_pop($stack);
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                $return .= "\n\n";
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                $return .= $this->wiki->addToken(
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                    $this->rule, 
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                    array (
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                        'type' => 'end',
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                        'level' => count($stack)
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                    )
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                );
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                $return .= "\n";
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            }
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            // add the line text.
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            $return .= $text;
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        }
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        // the last line may have been indented.  go through the stack
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        // and create end-tokens until the stack is empty.
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        $return .= "\n";
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        while (count($stack) > 0) {
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            array_pop($stack);
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            $return .= $this->wiki->addToken(
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                $this->rule, 
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                array (
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                    'type' => 'end',
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                    'level' => count($stack)
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                )
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            );
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        }
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        // we're done!  send back the replacement text.
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        return "\n$return\n\n";
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    }
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}
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?>