--- /dev/null
+<?php
+/**
+ * Class to convert HTML to Markdown with PHP Markdown Extra syntax support.
+ *
+ * @version 1.0.0 alpha
+ * @author Milian Wolff (<mail@milianw.de>, <http://milianw.de>)
+ * @license LGPL, see LICENSE_LGPL.txt and the summary below
+ * @copyright (C) 2007 Milian Wolff
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * standard Markdownify class
+ */
+require_once dirname(__FILE__) . '/markdownify.php';
+
+class Markdownify_Extra extends Markdownify {
+ /**
+ * table data, including rows with content and the maximum width of each col
+ *
+ * @var array
+ */
+ var $table = array();
+ /**
+ * current col
+ *
+ * @var int
+ */
+ var $col = -1;
+ /**
+ * current row
+ *
+ * @var int
+ */
+ var $row = 0;
+ /**
+ * constructor, see Markdownify::Markdownify() for more information
+ */
+ function Markdownify_Extra($linksAfterEachParagraph = MDFY_LINKS_EACH_PARAGRAPH, $bodyWidth = MDFY_BODYWIDTH, $keepHTML = MDFY_KEEPHTML) {
+ parent::Markdownify($linksAfterEachParagraph, $bodyWidth, $keepHTML);
+
+ ### new markdownable tags & attributes
+ # header ids: # foo {bar}
+ $this->isMarkdownable['h1']['id'] = 'optional';
+ $this->isMarkdownable['h2']['id'] = 'optional';
+ $this->isMarkdownable['h3']['id'] = 'optional';
+ $this->isMarkdownable['h4']['id'] = 'optional';
+ $this->isMarkdownable['h5']['id'] = 'optional';
+ $this->isMarkdownable['h6']['id'] = 'optional';
+ # tables
+ $this->isMarkdownable['table'] = array();
+ $this->isMarkdownable['th'] = array(
+ 'align' => 'optional',
+ );
+ $this->isMarkdownable['td'] = array(
+ 'align' => 'optional',
+ );
+ $this->isMarkdownable['tr'] = array();
+ array_push($this->ignore, 'thead');
+ array_push($this->ignore, 'tbody');
+ array_push($this->ignore, 'tfoot');
+ # definition lists
+ $this->isMarkdownable['dl'] = array();
+ $this->isMarkdownable['dd'] = array();
+ $this->isMarkdownable['dt'] = array();
+ # footnotes
+ $this->isMarkdownable['fnref'] = array(
+ 'target' => 'required',
+ );
+ $this->isMarkdownable['footnotes'] = array();
+ $this->isMarkdownable['fn'] = array(
+ 'name' => 'required',
+ );
+ $this->parser->blockElements['fnref'] = false;
+ $this->parser->blockElements['fn'] = true;
+ $this->parser->blockElements['footnotes'] = true;
+ # abbr
+ $this->isMarkdownable['abbr'] = array(
+ 'title' => 'required',
+ );
+ # build RegEx lookahead to decide wether table can pe parsed or not
+ $inlineTags = array_keys($this->parser->blockElements, false);
+ $colContents = '(?:[^<]|<(?:'.implode('|', $inlineTags).'|[^a-z]))+';
+ $this->tableLookaheadHeader = '{
+ ^\s*(?:<thead\s*>)?\s* # open optional thead
+ <tr\s*>\s*(?: # start required row with headers
+ <th(?:\s+align=("|\')(?:left|center|right)\1)?\s*> # header with optional align
+ \s*'.$colContents.'\s* # contents
+ </th>\s* # close header
+ )+</tr> # close row with headers
+ \s*(?:</thead>)? # close optional thead
+ }sxi';
+ $this->tdSubstitute = '\s*'.$colContents.'\s* # contents
+ </td>\s*';
+ $this->tableLookaheadBody = '{
+ \s*(?:<tbody\s*>)?\s* # open optional tbody
+ (?:<tr\s*>\s* # start row
+ %s # cols to be substituted
+ </tr>)+ # close row
+ \s*(?:</tbody>)? # close optional tbody
+ \s*</table> # close table
+ }sxi';
+ }
+ /**
+ * handle header tags (<h1> - <h6>)
+ *
+ * @param int $level 1-6
+ * @return void
+ */
+ function handleHeader($level) {
+ static $id = null;
+ if ($this->parser->isStartTag) {
+ if (isset($this->parser->tagAttributes['id'])) {
+ $id = $this->parser->tagAttributes['id'];
+ }
+ } else {
+ if (!is_null($id)) {
+ $this->out(' {#'.$id.'}');
+ $id = null;
+ }
+ }
+ parent::handleHeader($level);
+ }
+ /**
+ * handle <abbr> tags
+ *
+ * @param void
+ * @return void
+ */
+ function handleTag_abbr() {
+ if ($this->parser->isStartTag) {
+ $this->stack();
+ $this->buffer();
+ } else {
+ $tag = $this->unstack();
+ $tag['text'] = $this->unbuffer();
+ $add = true;
+ foreach ($this->stack['abbr'] as $stacked) {
+ if ($stacked['text'] == $tag['text']) {
+ /** TODO: differing abbr definitions, i.e. different titles for same text **/
+ $add = false;
+ break;
+ }
+ }
+ $this->out($tag['text']);
+ if ($add) {
+ array_push($this->stack['abbr'], $tag);
+ }
+ }
+ }
+ /**
+ * flush stacked abbr tags
+ *
+ * @param void
+ * @return void
+ */
+ function flushStacked_abbr() {
+ $out = array();
+ foreach ($this->stack['abbr'] as $k => $tag) {
+ if (!isset($tag['unstacked'])) {
+ array_push($out, ' *['.$tag['text'].']: '.$tag['title']);
+ $tag['unstacked'] = true;
+ $this->stack['abbr'][$k] = $tag;
+ }
+ }
+ if (!empty($out)) {
+ $this->out("\n\n".implode("\n", $out));
+ }
+ }
+ /**
+ * handle <table> tags
+ *
+ * @param void
+ * @return void
+ */
+ function handleTag_table() {
+ if ($this->parser->isStartTag) {
+ # check if upcoming table can be converted
+ if ($this->keepHTML) {
+ if (preg_match($this->tableLookaheadHeader, $this->parser->html, $matches)) {
+ # header seems good, now check body
+ # get align & number of cols
+ preg_match_all('#<th(?:\s+align=("|\')(left|right|center)\1)?\s*>#si', $matches[0], $cols);
+ $regEx = '';
+ $i = 1;
+ $aligns = array();
+ foreach ($cols[2] as $align) {
+ $align = strtolower($align);
+ array_push($aligns, $align);
+ if (empty($align)) {
+ $align = 'left'; # default value
+ }
+ $td = '\s+align=("|\')'.$align.'\\'.$i;
+ $i++;
+ if ($align == 'left') {
+ # look for empty align or left
+ $td = '(?:'.$td.')?';
+ }
+ $td = '<td'.$td.'\s*>';
+ $regEx .= $td.$this->tdSubstitute;
+ }
+ $regEx = sprintf($this->tableLookaheadBody, $regEx);
+ if (preg_match($regEx, $this->parser->html, $matches, null, strlen($matches[0]))) {
+ # this is a markdownable table tag!
+ $this->table = array(
+ 'rows' => array(),
+ 'col_widths' => array(),
+ 'aligns' => $aligns,
+ );
+ $this->row = 0;
+ } else {
+ # non markdownable table
+ $this->handleTagToText();
+ }
+ } else {
+ # non markdownable table
+ $this->handleTagToText();
+ }
+ } else {
+ $this->table = array(
+ 'rows' => array(),
+ 'col_widths' => array(),
+ 'aligns' => array(),
+ );
+ $this->row = 0;
+ }
+ } else {
+ # finally build the table in Markdown Extra syntax
+ $separator = array();
+ # seperator with correct align identifikators
+ foreach($this->table['aligns'] as $col => $align) {
+ if (!$this->keepHTML && !isset($this->table['col_widths'][$col])) {
+ break;
+ }
+ $left = ' ';
+ $right = ' ';
+ switch ($align) {
+ case 'left':
+ $left = ':';
+ break;
+ case 'center':
+ $right = ':';
+ $left = ':';
+ case 'right':
+ $right = ':';
+ break;
+ }
+ array_push($separator, $left.str_repeat('-', $this->table['col_widths'][$col]).$right);
+ }
+ $separator = '|'.implode('|', $separator).'|';
+
+ $rows = array();
+ # add padding
+ array_walk_recursive($this->table['rows'], array(&$this, 'alignTdContent'));
+ $header = array_shift($this->table['rows']);
+ array_push($rows, '| '.implode(' | ', $header).' |');
+ array_push($rows, $separator);
+ foreach ($this->table['rows'] as $row) {
+ array_push($rows, '| '.implode(' | ', $row).' |');
+ }
+ $this->out(implode("\n".$this->indent, $rows));
+ $this->table = array();
+ $this->setLineBreaks(2);
+ }
+ }
+ /**
+ * properly pad content so it is aligned as whished
+ * should be used with array_walk_recursive on $this->table['rows']
+ *
+ * @param string &$content
+ * @param int $col
+ * @return void
+ */
+ function alignTdContent(&$content, $col) {
+ switch ($this->table['aligns'][$col]) {
+ default:
+ case 'left':
+ $content .= str_repeat(' ', $this->table['col_widths'][$col] - $this->strlen($content));
+ break;
+ case 'right':
+ $content = str_repeat(' ', $this->table['col_widths'][$col] - $this->strlen($content)).$content;
+ break;
+ case 'center':
+ $paddingNeeded = $this->table['col_widths'][$col] - $this->strlen($content);
+ $left = floor($paddingNeeded / 2);
+ $right = $paddingNeeded - $left;
+ $content = str_repeat(' ', $left).$content.str_repeat(' ', $right);
+ break;
+ }
+ }
+ /**
+ * handle <tr> tags
+ *
+ * @param void
+ * @return void
+ */
+ function handleTag_tr() {
+ if ($this->parser->isStartTag) {
+ $this->col = -1;
+ } else {
+ $this->row++;
+ }
+ }
+ /**
+ * handle <td> tags
+ *
+ * @param void
+ * @return void
+ */
+ function handleTag_td() {
+ if ($this->parser->isStartTag) {
+ $this->col++;
+ if (!isset($this->table['col_widths'][$this->col])) {
+ $this->table['col_widths'][$this->col] = 0;
+ }
+ $this->buffer();
+ } else {
+ $buffer = trim($this->unbuffer());
+ $this->table['col_widths'][$this->col] = max($this->table['col_widths'][$this->col], $this->strlen($buffer));
+ $this->table['rows'][$this->row][$this->col] = $buffer;
+ }
+ }
+ /**
+ * handle <th> tags
+ *
+ * @param void
+ * @return void
+ */
+ function handleTag_th() {
+ if (!$this->keepHTML && !isset($this->table['rows'][1]) && !isset($this->table['aligns'][$this->col+1])) {
+ if (isset($this->parser->tagAttributes['align'])) {
+ $this->table['aligns'][$this->col+1] = $this->parser->tagAttributes['align'];
+ } else {
+ $this->table['aligns'][$this->col+1] = '';
+ }
+ }
+ $this->handleTag_td();
+ }
+ /**
+ * handle <dl> tags
+ *
+ * @param void
+ * @return void
+ */
+ function handleTag_dl() {
+ if (!$this->parser->isStartTag) {
+ $this->setLineBreaks(2);
+ }
+ }
+ /**
+ * handle <dt> tags
+ *
+ * @param void
+ * @return void
+ **/
+ function handleTag_dt() {
+ if (!$this->parser->isStartTag) {
+ $this->setLineBreaks(1);
+ }
+ }
+ /**
+ * handle <dd> tags
+ *
+ * @param void
+ * @return void
+ */
+ function handleTag_dd() {
+ if ($this->parser->isStartTag) {
+ if (substr(ltrim($this->parser->html), 0, 3) == '<p>') {
+ # next comes a paragraph, so we'll need an extra line
+ $this->out("\n".$this->indent);
+ } elseif (substr($this->output, -2) == "\n\n") {
+ $this->output = substr($this->output, 0, -1);
+ }
+ $this->out(': ');
+ $this->indent(' ', false);
+ } else {
+ # lookahead for next dt
+ if (substr(ltrim($this->parser->html), 0, 4) == '<dt>') {
+ $this->setLineBreaks(2);
+ } else {
+ $this->setLineBreaks(1);
+ }
+ $this->indent(' ');
+ }
+ }
+ /**
+ * handle <fnref /> tags (custom footnote references, see markdownify_extra::parseString())
+ *
+ * @param void
+ * @return void
+ */
+ function handleTag_fnref() {
+ $this->out('[^'.$this->parser->tagAttributes['target'].']');
+ }
+ /**
+ * handle <fn> tags (custom footnotes, see markdownify_extra::parseString()
+ * and markdownify_extra::_makeFootnotes())
+ *
+ * @param void
+ * @return void
+ */
+ function handleTag_fn() {
+ if ($this->parser->isStartTag) {
+ $this->out('[^'.$this->parser->tagAttributes['name'].']:');
+ $this->setLineBreaks(1);
+ } else {
+ $this->setLineBreaks(2);
+ }
+ $this->indent(' ');
+ }
+ /**
+ * handle <footnotes> tag (custom footnotes, see markdownify_extra::parseString()
+ * and markdownify_extra::_makeFootnotes())
+ *
+ * @param void
+ * @return void
+ */
+ function handleTag_footnotes() {
+ if (!$this->parser->isStartTag) {
+ $this->setLineBreaks(2);
+ }
+ }
+ /**
+ * parse a HTML string, clean up footnotes prior
+ *
+ * @param string $HTML input
+ * @return string Markdown formatted output
+ */
+ function parseString($html) {
+ /** TODO: custom markdown-extra options, e.g. titles & classes **/
+ # <sup id="fnref:..."><a href"#fn..." rel="footnote">...</a></sup>
+ # => <fnref target="..." />
+ $html = preg_replace('@<sup id="fnref:([^"]+)">\s*<a href="#fn:\1" rel="footnote">\s*\d+\s*</a>\s*</sup>@Us', '<fnref target="$1" />', $html);
+ # <div class="footnotes">
+ # <hr />
+ # <ol>
+ #
+ # <li id="fn:...">...</li>
+ # ...
+ #
+ # </ol>
+ # </div>
+ # =>
+ # <footnotes>
+ # <fn name="...">...</fn>
+ # ...
+ # </footnotes>
+ $html = preg_replace_callback('#<div class="footnotes">\s*<hr />\s*<ol>\s*(.+)\s*</ol>\s*</div>#Us', array(&$this, '_makeFootnotes'), $html);
+ return parent::parseString($html);
+ }
+ /**
+ * replace HTML representation of footnotes with something more easily parsable
+ *
+ * @note this is a callback to be used in parseString()
+ *
+ * @param array $matches
+ * @return string
+ */
+ function _makeFootnotes($matches) {
+ # <li id="fn:1">
+ # ...
+ # <a href="#fnref:block" rev="footnote">↩</a></p>
+ # </li>
+ # => <fn name="1">...</fn>
+ # remove footnote link
+ $fns = preg_replace('@\s*( \s*)?<a href="#fnref:[^"]+" rev="footnote"[^>]*>↩</a>\s*@s', '', $matches[1]);
+ # remove empty paragraph
+ $fns = preg_replace('@<p>\s*</p>@s', '', $fns);
+ # <li id="fn:1">...</li> -> <footnote nr="1">...</footnote>
+ $fns = str_replace('<li id="fn:', '<fn name="', $fns);
+
+ $fns = '<footnotes>'.$fns.'</footnotes>';
+ return preg_replace('#</li>\s*(?=(?:<fn|</footnotes>))#s', '</fn>$1', $fns);
+ }
+}
\ No newline at end of file
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