transform($text);
}
// ###################################################################
/**
* Resets the parser
*/
public function __construct()
{
$this->htmlBlockMap = array();
$this->text = '';
}
// ###################################################################
/**
* Transforms the Markdown text into XHTML with the parser's set options
*
* @param string Text to transform
*
* @return string HTML output
*/
public function transform($text)
{
// reset the data arrays
$this->__construct();
// convert line breaks and remove empty lines of whitespace
$this->text = BSFunctions::ConvertLineBreaks($text);
$this->text = preg_replace('/^\s*?$/m', '', $this->text);
$this->_extractHtmlBlocks();
$this->_convertHardLineBreaks();
$this->_convertAtxHeaders();
$this->_convertSetextHeaders();
$this->_convertHorizontalRules();
$this->_formatParagraphs();
$this->text = $this->_expandHtmlBlocks($this->text);
// convert entitites
$this->_convertFloatingEntities();
return $this->text;
}
// ###################################################################
/**
* Description of the function
*
* @param string A string param
*
* @return integer Return value
*/
private function _extractHtmlBlocks()
{
$start = -1;
$blockStart = 0;
$nest = array();
$matches = array();
// find the first insance of a block tag
$regex = implode('|', $this->htmlBockTags);
while ($start <= strlen($this->text))
{
$start++;
if (preg_match("/^<($regex)/i", substr($this->text, $start)) === 1)
{
if (sizeof($nest) == 0)
{
$blockStart = $start;
}
array_push($nest, $start);
}
else if (preg_match("#^#i", substr($this->text, $start), $matches) === 1)
{
array_pop($nest);
if (sizeof($nest) == 0)
{
$block = substr($this->text, $blockStart, $start - $blockStart + strlen($matches[0]));
$hash = md5($block . microtime());
$this->htmlBlockMap[$hash] = $block;
$this->text = substr_replace($this->text, $hash, $blockStart, strlen($block));
$start = $blockStart;
}
}
}
}
// ###################################################################
/**
* Expands the hashed HTML blocks back into their originial form
*/
private function _expandHtmlBlocks($text)
{
return str_replace(array_keys($this->htmlBlockMap), array_values($this->htmlBlockMap), $text);
}
// ###################################################################
/**
* Converts text surrounded by #sings to headers (## Heading 2)
*/
private function _convertAtxHeaders()
{
$this->text = preg_replace_callback('/^(\#{1,6})\s*(.+)(\s*\#+)?$/', array(&$this, '_convertAtxHeadersCallback'), $this->text);
}
// ###################################################################
/**
* Callback function for preg_replace() in _convertAtxHeaders()
*
* @param array Matches
*/
private function _convertAtxHeadersCallback($matches)
{
var_dump($matches);
$html = '' . $this->_expandHtmlBlocks($matches[2]) . '';
$hash = md5($html . microtime());
$this->htmlBlockMap[$hash] = $html;
return $hash;
}
// ###################################################################
/**
* Converts headers that are formed by underlines into headings
*/
private function _convertSetextHeaders()
{
$this->text = preg_replace_callback('/(.+)\n(-|=){1,}$/m', array(&$this, '_convertSetextHeadersCallback'), $this->text);
}
// ###################################################################
/**
* Callback function for _convertSetextHeaders(). This does the actual
* conversion and then hashes it into a block
*
* @param array Matches from the preg_replace_callback()
*/
private function _convertSetextHeadersCallback($matches)
{
$text = $this->_expandHtmlBlocks($matches[1]);
if ($matches[2][0] == '=')
{
$text = '' . $text . '
';
}
else
{
$text = '' . $text . '
';
}
$hash = md5($text . microtime());
$this->htmlBlockMap[$hash] = $text;
return $hash;
}
// ###################################################################
/**
* Converts three stars or dashes (optionally separated by spaces) into
* a horizontal rule.
*/
private function _convertHorizontalRules()
{
$hash = md5('
' . microtime());
$count = 0;
$this->text = preg_replace('/((-|\*) ?){3,}/', $hash, $this->text, -1, $count);
if ($count > 0)
{
$this->htmlBlockMap[$hash] = '
';
}
}
// ###################################################################
/**
* Wraps blocks into paragraphs
*/
private function _formatParagraphs()
{
$blocks = preg_split('/\n{2,}/', $this->text, -1, PREG_SPLIT_NO_EMPTY);
foreach ($blocks AS $key => $value)
{
if (!isset($this->htmlBlockMap[$value]))
{
$blocks[$key] = "$value
";
}
}
$this->text = implode("\n\n", $blocks);
}
// ###################################################################
/**
* Converts two spaces followed by a new line with text on it to
* a hard line break (
)
*/
private function _convertHardLineBreaks()
{
$this->text = preg_replace('/ {2,}\n/m', "
\n", $this->text);
}
// ###################################################################
/**
* Converts all angle brackets and ampersands that are floating into
* HTML entities
*/
private function _convertFloatingEntities()
{
// encode ampersands
$this->text = preg_replace('/&(?!#?x?[0-9a-z]+;)/i', '&', $this->text);
// encode brackets who aren't followed by text
$this->text = preg_replace('#<(?![/?a-z])#i', '<', $this->text);
}
}
/*=====================================================================*\
|| ###################################################################
|| # $HeadURL$
|| # $Id$
|| ###################################################################
\*=====================================================================*/
?>