From 7c8d817e4c95b96468fac76177e652dace28f682 Mon Sep 17 00:00:00 2001
From: Robert Sesek <rsesek@bluestatic.org>
Date: Tue, 3 Apr 2007 19:24:28 +0000
Subject: [PATCH] Markdown parser in progress....
---
Markdown.php | 224 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 224 insertions(+)
diff --git a/Markdown.php b/Markdown.php
index 9da0d21..0526275 100644
--- a/Markdown.php
+++ b/Markdown.php
@@ -19,6 +19,8 @@
|| ###################################################################
\*=====================================================================*/
+require_once('ISSO/Functions.php');
+
/**
* Markdown
*
@@ -34,6 +36,36 @@
*/
class BSMarkdown
{
+ /**
+ * Remove HTML rather than ignoring it?
+ * @var bool
+ */
+ public $removeHtml = false;
+
+ /**
+ * Map of HTML blocks extracted from the text
+ * @var array
+ */
+ private $htmlBlockMap = array();
+
+ /**
+ * The working parser text that at any given moment is only partially parsed
+ * @var string
+ */
+ private $text;
+
+ /**
+ * HTML block element tags
+ * @var array
+ */
+ private $htmlBockTags = array(
+ 'p', 'div', 'blockquote',
+ 'pre', 'table', 'form', 'ol',
+ 'ul', 'h1', 'h2', 'h3', 'h4',
+ 'h5', 'h6', 'iframe', 'script',
+ 'noscript'
+ );
+
// ###################################################################
/**
* Quick parsing function that uses the system defaults for parsing.
@@ -44,7 +76,199 @@ class BSMarkdown
*/
public static function Parse($text)
{
+ $parser = new BSMarkdown();
+ return $parser->transform($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->_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, $start);
+ }
+ else if (preg_match("#^</($regex)>#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);
+ $html = '<h' . strlen($matches[1]) . '>' . $this->_expandHtmlBlocks($matches[2]) . '</h' . strlen($matches[1]) . '>';
+ $hash = md5($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 = '<h1>' . $text . '</h1>';
+ }
+ else
+ {
+ $text = '<h2>' . $text . '</h2>';
+ }
+ $hash = md5($text . microtime());
+ $this->htmlBlockMap[$hash] = $text;
+ return $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] = "<p>$value</p>";
+ }
+ }
+
+ $this->text = implode("\n\n", $blocks);
+ }
+
+ // ###################################################################
+ /**
+ * Converts two spaces followed by a new line with text on it to
+ * a hard line break (<br />)
+ */
+ private function _convertHardLineBreaks()
+ {
+ $this->text = preg_replace('/ {2,}\n/m', " <br />\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);
}
}
--
2.43.5