Merge branch 'master' of git://github.com/friendica/friendica

1 files changed, 489 insertions, 0 deletions

diff --git a/include/markdownify/markdownify_extra.php b/include/markdownify/markdownify_extra.php
new file mode 100644
index 000000000..e978a1c8a
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+++ b/include/markdownify/markdownify_extra.php
@@ -0,0 +1,489 @@
+<?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">&#8617;</a></p>
+    # </li>
+    # => <fn name="1">...</fn>
+    # remove footnote link
+    $fns = preg_replace('@\s*(&#160;\s*)?<a href="#fnref:[^"]+" rev="footnote"[^>]*>&#8617;</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);
+  }
+}
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