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Code Editor : wiki_to_markdown.php

<?php

// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Utility function to convert wiki-like to Markdown format
 *
 * @package    core
 * @subpackage lib
 * @copyright  Howard Miller, 2005
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

/**#@+
 *  state defines
 */
define( "STATE_NONE",1 ); // blank line has been detected, so looking for first line on next para
define( "STATE_PARAGRAPH",2 ); // currently processing vanilla paragraph
define( "STATE_BLOCKQUOTE",3 ); // currently processing blockquote section
define( "STATE_PREFORM",4 ); // currently processing preformatted text
define( "STATE_NOTIKI",5 ); // currently processing preformatted / no formatting
/**#@-*/
/**#@+
 * list defines
 */
define( "LIST_NONE", 1 ); // no lists active
define( "LIST_UNORDERED", 2 ); // unordered list active
define( "LIST_ORDERED", 3 ); // ordered list active
define( "LIST_DEFINITION", 4 ); // definition list active
/**#@-*/

/**
 * @package   moodlecore
 * @copyright Howard Miller, 2005
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class WikiToMarkdown {

var $block_state;
  var $list_state;
  var $list_depth;
  var $list_backtrack;
  var $output; // output buffer
  var $courseid;

function close_block( $state ) {
    // provide appropriate closure for block according to state

// if in list close this first
    $lclose = "";
    if ($this->list_state != LIST_NONE) {
      $lclose = $this->do_list( " ",true );
    }

$sclose = "";
    switch ($state) {
      case STATE_PARAGRAPH:
        $sclose =  "\n";
        break;
      case STATE_BLOCKQUOTE:
        $sclose =  "\n";
        break;
      case STATE_PREFORM:
        $sclose =  "</pre>\n";
        break;
      case STATE_NOTIKI:
        $sclose =  "\n";
        break;
    }

return $lclose . $sclose;
  }

function do_replace( $line, $mark, $tag ) {
    // do the regex thingy for things like bold, italic etc
    // $mark is the magic character, and $tag the HTML tag to insert

// BODGE: replace inline $mark characters in places where we want them ignored
    // they will be put back after main substitutue, stops problems with eg, and/or
    $bodge = chr(1);
    $line = preg_replace( '/([[:alnum:]])'.$mark.'([[:alnum:]])/i', '\\1'.$bodge.'\\2',$line );

$regex = '/(^| |[(.,])'.$mark.'([^'.$mark.']*)'.$mark.'([^[:alnum:]]|$)/i';
    $replace = '\\1<'.$tag.'>\\2</'.$tag.'>\\3';
    $line = preg_replace( $regex, $replace, $line );

// BODGE: back we go
    $line = preg_replace( '/'.$bodge.'/i', $mark, $line );

return $line;
  }

function do_replace_markdown( $line, $mark, $tag ) {
    // do the regex thingy for things like bold, italic etc
    // $mark is the magic character, and $tag the HTML tag to insert
    // MARKDOWN version does not generate HTML tags, just straigt replace

$regex = '/(^| |[(.,])'.$mark.'([^'.$mark.']*)'.$mark.'([^[:alnum:]]|$)/i';
    $replace = '\\1'.$tag.'\\2'.$tag.'\\3';
    $line = preg_replace( $regex, $replace, $line );

// BODGE: back we go
    $line = preg_replace( '/'.$bodge.'/i', $mark, $line );

return $line;
  }

function do_replace_sub( $line, $mark, $tag ) {
    // do regex for subscript and superscript (slightly different)
    // $mark is the magic character and $tag the HTML tag to insert

$regex = '/'.$mark.'([^'.$mark.']*)'.$mark.'/i';
    $replace = '<'.$tag.'>\\1</'.$tag.'>';

return preg_replace( $regex, $replace, $line );
  }

function do_list( $line, $blank=false ) {
    // handle line with list character on it
    // if blank line implies drop to level 0

// get magic character and then delete it from the line if not blank
    if ($blank) {
      $listchar="";
      $count = 0;
    }
    else {
      $listchar = $line[0];
      $count = strspn( $line, $listchar );
      $line = preg_replace( "/^[".$listchar."]+ /i", "", $line );
    }

// find what sort of list this character represents
    $list_tag = "";
    $list_close_tag = "";
    $item_tag = "";
    $item_close_tag = "";
    $list_style = LIST_NONE;
    switch ($listchar) {
      case '*':
        $list_tag = "";
        $list_close_tag = "";
        $item_tag = "*";
        $item_close_tag = "";
        $list_style = LIST_UNORDERED;
        break;
      case '#':
        $list_tag = "";
        $list_close_tag = "";
        $item_tag = "1.";
        $item_close_tag = "";
        $list_style = LIST_ORDERED;
        break;
      case ';':
        $list_tag = "<dl>";
        $list_close_tag = "</dl>";
        $item_tag = "<dd>";
        $item_close_tag = "</dd>";
        $list_style = LIST_DEFINITION;
        break;
      case ':':
        $list_tag = "<dl>";
        $list_close_tag = "</dl>";
        $item_tag = "<dt>";
        $item_close_tag = "</dt>";
        $list_style = LIST_DEFINITION;
        break;
      }

// tag opening/closing regime now - fun bit :-)
    $tags = "";

// if depth has reduced do number of closes to restore level
    for ($i=$this->list_depth; $i>$count; $i-- ) {
      $close_tag = array_pop( $this->list_backtrack );
      $tags = $tags . $close_tag;
      }

// if depth has increased do number of opens to balance
    for ($i=$this->list_depth; $i<$count; $i++ ) {
      array_push( $this->list_backtrack, "$list_close_tag" );
      $tags = $tags . "$list_tag";
    }

// ok, so list state is now same as style and depth same as count
    $this->list_state = $list_style;
    $this->list_depth = $count;

// get indent
    $indent = substr( "                      ",1,$count-1 );

if ($blank) {
      $newline = $tags;
    }
    else {
      $newline = $tags . $indent . "$item_tag " . $line . "$item_close_tag";
    }

return $newline;
  }

function line_replace( $line ) {
    // return line after various formatting replacements
    // have been made - order is vital to stop them interfering with each other

global $CFG;

// ---- (at least) means a <hr />
    // MARKDOWN: no change so leave

// is this a list line (starts with * # ; :)
    if (preg_match( "/^([*]+|[#]+|[;]+|[:]+) /i", $line )) {
      $line = $this->do_list( $line );
    }

// typographic conventions
   // MARKDOWN: no equiv. so convert to entity as before
    // $line = str_replace( "--", "&#8212;", $line );
    // $line = str_replace( " - ", " &#8211; ", $line );
    $line = str_replace( "...", " &#8230; ", $line );
    $line = str_replace( "(R)", "&#174;", $line );
    $line = str_replace( "(r)", "&#174;", $line );
    $line = str_replace( "(TM)", "&#8482;", $line );
    $line = str_replace( "(tm)", "&#8482;", $line );
    $line = str_replace( "(C)", "&#169;", $line );
    $line = str_replace( "1/4", "&#188;", $line );
    $line = str_replace( "1/2", "&#189;", $line );
    $line = str_replace( "3/4", "&#190;", $line );
    $line = preg_replace( "/([[:digit:]]+[[:space:]]*)x([[:space:]]*[[:digit:]]+)/i", "\\1&#215;\\2", $line ); // (digits) x (digits) - multiply
    // do formatting tags
    // NOTE: The / replacement  *has* to be first, or it will screw the
    //    HTML tags that are added by the other ones
    // MARKDOWN: only bold and italic change, rest are just HTML
    $line = $this->do_replace_markdown( $line, "\*", "**" );
    $line = $this->do_replace_markdown( $line, "/", "*" );
    $line = $this->do_replace( $line, "\+", "ins" );
    // $line = $this->do_replace( $line, "-", "del" );
    $line = $this->do_replace_sub( $line, "~", "sub" );
    $line = $this->do_replace_sub( $line, "\^", "sup" );
    $line = $this->do_replace( $line, "%", "code" );
    $line = $this->do_replace( $line, "@", "cite" );

// convert urls into proper link with optional link text URL(text)
    // MARDOWN: HTML conversion should work fine
    $line = preg_replace("/([[:space:]]|^)([[:alnum:]]+)://([^[:space:]]*)([[:alnum:]#?/&=])$([^)]+)$/i",
      "\\1[\\5](\\2://\\3\\4)", $line);
    $line = preg_replace("/([[:space:]])www\.([^[:space:]]*)([[:alnum:]#?/&=])$([^)]+)$/i",
      "\\1[\\5](http://www.\\2\\3)", $line);

// make urls (with and without httpd) into proper links
    $line = preg_replace("/([[:space:]]|^)([[:alnum:]]+)://([^[:space:]]*)([[:alnum:]#?/&=])/i",
      "\\1<\\2://\\3\\4>", $line);
    $line = preg_replace("/([[:space:]])www\.([^[:space:]]*)([[:alnum:]#?/&=])/i",
      "\\1<http://www.\\2\\3\>", $line);

// make email addresses into mailtos....
    // MARKDOWN doesn't quite support this, so do as html
    $line = preg_replace("/([[:space:]]|^)([[:alnum:]._-]+@[[:alnum:]._-]+)$([^)]+)$/i",
       "\\1<a href=\"mailto:\\2\">\\3</a>", $line);

// !# at the beginning of any lines means a heading
    // MARKDOWN: value (1-6) becomes number of hashes
    if (preg_match( "/^!([1-6]) (.*)$/i", $line, $regs )) {
      $depth = substr( $line, 1, 1 );
      $out = substr( '##########', 0, $depth);
      $line = preg_replace( "/^!([1-6]) (.*)$/i", "$out \\2", $line );
    }

// acronym handing, example HTML(Hypertext Markyp Language)
    // MARKDOWN: no equiv. so just leave as HTML
    $line = preg_replace( "/([A-Z]+)$([^)]+)$/", "<acronym title=\"\\2\">\\1</acronym>", $line );

// Replace resource link >>##(Description Text)
    // MARKDOWN: change to MD web link style
    $line = preg_replace("/ ([a-zA-Z]+):([0-9]+)$([^)]+)$/i",
       " [\\3](".$CFG->wwwroot."/mod/\\1/view.php?id=\\2) ", $line );

$coursefileurl = array(moodle_url::make_legacyfile_url($this->courseid, null));

// Replace picture resource link
    $line = preg_replace("#/([a-zA-Z0-9./_-]+)(png|gif|jpg)$([^)]+)$#i",
            "![\\3](".$coursefileurl."/\\1\\2)", $line );

// Replace file resource link
    $line = preg_replace("#file:/([[:alnum:]/._-]+)$([^)]+)$#i",
            "[\\2](".$coursefileurl."/\\1)", $line );

return $line;
  }

function convert( $content,$courseid ) {

// main entry point for processing Wiki-like text
    // $content is string containing text with Wiki-Like formatting
    // return: string containing Markdown formatting

// initialisation stuff
    $this->output = "";
    $this->block_state = STATE_NONE;
    $this->list_state = LIST_NONE;
    $this->list_depth = 0;
    $this->list_backtrack = array();
    $this->spelling_on = false;
    $this->courseid = $courseid;

// split content into array of single lines
    $lines = explode( "\n",$content );
    $buffer = "";

// run through lines
    foreach( $lines as $line ) {
      // is this a blank line?
      $blank_line = preg_match( "/^[[:blank:]\r]*$/i", $line );
      if ($blank_line) {
        // first end current block according to state
        $buffer = $buffer . $this->close_block( $this->block_state );
        $this->block_state = STATE_NONE;
        continue;
      }

// act now depending on current block state
      if ($this->block_state == STATE_NONE) {
        // first character of line defines block type
        if (preg_match( "/^> /i",$line )) {
          // blockquote
          $buffer = $buffer . $this->line_replace( $line ). "\n";
          $this->block_state = STATE_BLOCKQUOTE;
        }
        else
        if (preg_match( "/^  /i",$line) ) {
          // preformatted text
          // MARKDOWN: no real equiv. so just use <pre>
          $buffer = $buffer . "<pre>\n";
          $buffer = $buffer . $this->line_replace($line) . "\n";
          $this->block_state = STATE_PREFORM;
        }
        else
        if (preg_match("/^\% /i",$line) ) {
                // preformatted text - no processing
                // MARKDOWN: this is MD code form of a paragraph
                $buffer = $buffer . "    " . preg_replace( "/^\%/i","",$line) . "\n";
                $this->block_state = STATE_NOTIKI;
        }
        else {
          // ordinary paragraph
          $buffer = $buffer . $this->line_replace($line) . "\n";
          $this->block_state = STATE_PARAGRAPH;
        }
        continue;
      }

if (($this->block_state == STATE_PARAGRAPH) |
          ($this->block_state == STATE_BLOCKQUOTE) |
          ($this->block_state == STATE_PREFORM) ) {
        $buffer = $buffer . $this->line_replace($line) . "\n";
        continue;
      }
      elseif ($this->block_state == STATE_NOTIKI) {
        $buffer = $buffer . "    " .$line . "\n";
      }
    }

// close off any block level tags
    $buffer = $buffer . $this->close_block( $this->block_state );

//return $buffer;
    return $buffer;
  }
}

${this.title}

Code Editor : wiki_to_markdown.php