Subversion Repositories Applications.papyrus

<?php

/**

*

* Parse for block-quoted text.

*

* Find source text marked as a blockquote, identified by any number of

* greater-than signs '>' at the start of the line, followed by a space,

* and then the quote text; each '>' indicates an additional level of

* quoting.

*

* $Id: Blockquote.php,v 1.1 2005-01-20 19:43:20 jpm Exp $

*

* @author Paul M. Jones <pmjones@ciaweb.net>

*

* @package Text_Wiki

*

*/

class Text_Wiki_Parse_Blockquote extends Text_Wiki_Parse {

    /**

    *

    * Regex for parsing the source text.

    *

    * @access public

    *

    * @var string

    *

    * @see parse()

    *

    */

    var $regex = '/\n((\>).*\n)(?!(\>))/Us';

    /**

    *

    * Generates a replacement for the matched text.

    *

    * Token options are:

    *

    * 'type' =>

    *     'start' : the start of a blockquote

    *     'end'   : the end of a blockquote

    *

    * 'level' => the indent level (0 for the first level, 1 for the

    * second, etc)

    *

    * @access public

    *

    * @param array &$matches The array of matches from parse().

    *

    * @return A series of text and delimited tokens marking the different

    * list text and list elements.

    *

    */

    function process(&$matches)

    {

        // the replacement text we will return to parse()

        $return = '';

        // the list of post-processing matches

        $list = array();

        // $matches[1] is the text matched as a list set by parse();

        // create an array called $list that contains a new set of

        // matches for the various list-item elements.

        preg_match_all(

            '=^(\>+) (.*\n)=Ums',

            $matches[1],

            $list,

            PREG_SET_ORDER

        );

        // a stack of starts and ends; we keep this so that we know what

        // indent level we're at.

        $stack = array();

        // loop through each list-item element.

        foreach ($list as $key => $val) {

            // $val[0] is the full matched list-item line

            // $val[1] is the number of initial '>' chars (indent level)

            // $val[2] is the quote text

            // we number levels starting at 1, not zero

            $level = strlen($val[1]);

            // get the text of the line

            $text = $val[2];

            // add a level to the list?

            while ($level > count($stack)) {

                // the current indent level is greater than the number

                // of stack elements, so we must be starting a new

                // level.  push the new level onto the stack with a

                // dummy value (boolean true)...

                array_push($stack, true);

                $return .= "\n";

                // ...and add a start token to the return.

                $return .= $this->wiki->addToken(

                    $this->rule,

                    array(

                        'type' => 'start',

                        'level' => $level - 1

                    )

                );

                $return .= "\n\n";

            }

            // remove a level?

            while (count($stack) > $level) {

                // as long as the stack count is greater than the

                // current indent level, we need to end list types.

                // continue adding end-list tokens until the stack count

                // and the indent level are the same.

                array_pop($stack);

                $return .= "\n\n";

                $return .= $this->wiki->addToken(

                    $this->rule,

                    array (

                        'type' => 'end',

                        'level' => count($stack)

                    )

                );

                $return .= "\n";

            }

            // add the line text.

            $return .= $text;

        }

        // the last line may have been indented.  go through the stack

        // and create end-tokens until the stack is empty.

        $return .= "\n";

        while (count($stack) > 0) {

            array_pop($stack);

            $return .= $this->wiki->addToken(

                $this->rule,

                array (

                    'type' => 'end',

                    'level' => count($stack)

                )

            );

        }

        // we're done!  send back the replacement text.

        return "\n$return\n\n";

    }

}

?>