<?php
/**
*
* Parses for bulleted and numbered lists.
*
* @category Text
*
* @package Text_Wiki
*
* @author Justin Patrin <papercrane@reversefold.com>
* @author Paul M. Jones <pmjones@php.net>
*
* @license LGPL
*
* @version $Id: List.php,v 1.1 2006/03/28 04:46:09 ritzmo Exp $
*
*/
/**
*
* Parses for bulleted and numbered lists.
*
* This class implements a Text_Wiki_Parse to find source text marked as
* a bulleted or numbered list. In short, if a line starts with '* ' then
* it is a bullet list item; if a line starts with '# ' then it is a
* number list item. Spaces in front of the * or # indicate an indented
* sub-list. The list items must be on sequential lines, and may be
* separated by blank lines to improve readability. Using a non-* non-#
* non-whitespace character at the beginning of a line ends the list.
*
* @category Text
*
* @package Text_Wiki
*
* @author Justin Patrin <papercrane@reversefold.com>
* @author Paul M. Jones <pmjones@php.net>
*
*/
class Text_Wiki_Parse_List extends Text_Wiki_Parse {
/**
*
* The regular expression used to parse the source text and find
* matches conforming to this rule. Used by the parse() method.
*
* @access public
*
* @var string
*
* @see parse()
*
*/
//TODO: add text continuations (any number of + signs) and expandable areas (- after *s ot #s)
var $regex = '/\n((?:\*|#)+.*?\n(?!(?:\*|#)+))/s';
/**
*
* Generates a replacement for the matched text. Token options are:
*
* 'type' =>
* 'bullet_start' : the start of a bullet list
* 'bullet_end' : the end of a bullet list
* 'number_start' : the start of a number list
* 'number_end' : the end of a number list
* 'item_start' : the start of item text (bullet or number)
* 'item_end' : the end of item text (bullet or number)
* 'unknown' : unknown type of list or item
*
* 'level' => the indent level (0 for the first level, 1 for the
* second, etc)
*
* 'count' => the list item number at this level. not needed for
* xhtml, but very useful for PDF and RTF.
*
* @access public
*
* @param array &$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
$return = '';
// the list of post-processing matches
$list = array();
// a stack of list-start and list-end types; we keep this
// so that we know what kind of list we're working with
// (bullet or number) and what indent level we're at.
$stack = array();
// the item count is the number of list items for any
// given list-type on the stack
$itemcount = array();
// have we processed the very first list item?
$pastFirst = false;
// populate $list with this set of matches. $matches[1] is the
// text matched as a list set by parse().
preg_match_all(
'/^((\*|#)+)(.*?)$/ms',
$matches[1],
$list,
PREG_SET_ORDER
);
// loop through each list-item element.
foreach ($list as $key => $val) {
// $val[0] is the full matched list-item line
// $val[1] is the type (* or #)
// $val[2] is the level (number)
// $val[3] is the list item text
// how many levels are we indented? (1 means the "root"
// list level, no indenting.)
$level = strlen($val[1]);
// get the list item type
if ($val[2] == '*') {
$type = 'bullet';
} elseif ($val[2] == '#') {
$type = 'number';
} else {
$type = 'unknown';
}
// get the text of the list item
$text = $val[3];
// add a level to the list?
if ($level > count($stack)) {
// the current indent level is greater than the
// number of stack elements, so we must be starting
// a new list. push the new list type onto the
// stack...
array_push($stack, $type);
// ...and add a list-start token to the return.
$return .= $this->wiki->addToken(
$this->rule,
array(
'type' => $type . '_list_start',
'level' => $level - 1
)
);
}
// remove a level from the list?
while (count($stack) > $level) {
// so we don't keep counting the stack, we set up a temp
// var for the count. -1 becuase we're going to pop the
// stack in the next command. $tmp will then equal the
// current level of indent.
$tmp = count($stack) - 1;
// 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.
$return .= $this->wiki->addToken(
$this->rule,
array (
'type' => array_pop($stack) . '_list_end',
'level' => $tmp
)
);
// reset to the current (previous) list type so that
// the new list item matches the proper list type.
$type = $stack[$tmp - 1];
// reset the item count for the popped indent level
unset($itemcount[$tmp + 1]);
}
// add to the item count for this list (taking into account
// which level we are at).
if (! isset($itemcount[$level])) {
// first count
$itemcount[$level] = 0;
} else {
// increment count
$itemcount[$level]++;
}
// is this the very first item in the list?
if (! $pastFirst) {
$first = true;
$pastFirst = true;
} else {
$first = false;
}
// create a list-item starting token.
$start = $this->wiki->addToken(
$this->rule,
array(
'type' => $type . '_item_start',
'level' => $level,
'count' => $itemcount[$level],
'first' => $first
)
);
// create a list-item ending token.
$end = $this->wiki->addToken(
$this->rule,
array(
'type' => $type . '_item_end',
'level' => $level,
'count' => $itemcount[$level]
)
);
// add the starting token, list-item text, and ending token
// to the return.
$return .= $start . $text . $end;
}
// the last list-item may have been indented. go through the
// list-type stack and create end-list tokens until the stack
// is empty.
while (count($stack) > 0) {
$return .= $this->wiki->addToken(
$this->rule,
array (
'type' => array_pop($stack) . '_list_end',
'level' => count($stack)
)
);
}
// we're done! send back the replacement text.
return "\n" . $return . "\n\n";
}
}
?>