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   1  function parse()
   2  {
   3      var pos = text.indexOf('![');
   4      if (pos === -1)
   5      {
   6          return;
   7      }
   8      if (text.indexOf('](', pos) > 0)
   9      {
  10          parseInlineImages();
  11      }
  12      if (hasReferences)
  13      {
  14          parseReferenceImages();
  15      }
  16  }
  17  
  18  /**
  19  * Add an image tag for given text span
  20  *
  21  * @param {number} startPos Start tag position
  22  * @param {number} endPos   End tag position
  23  * @param {number} endLen   End tag length
  24  * @param {string} linkInfo URL optionally followed by space and a title
  25  * @param {string} alt      Value for the alt attribute
  26  */
  27  function addImageTag(startPos, endPos, endLen, linkInfo, alt)
  28  {
  29      var tag = addTagPair('IMG', startPos, 2, endPos, endLen);
  30      setLinkAttributes(tag, linkInfo, 'src');
  31      tag.setAttribute('alt', decode(alt));
  32  
  33      // Overwrite the markup
  34      overwrite(startPos, endPos + endLen - startPos);
  35  }
  36  
  37  /**
  38  * Parse inline images markup
  39  */
  40  function parseInlineImages()
  41  {
  42      var m, regexp = /!\[(?:[^\x17[\]]|\[[^\x17[\]]*\])*\]\(( *(?:[^\x17\s()]|\([^\x17\s()]*\))*(?=[ )]) *(?:"[^\x17]*?"|'[^\x17]*?'|\([^\x17)]*\))? *)\)/g;
  43      while (m = regexp.exec(text))
  44      {
  45          var linkInfo = m[1],
  46              startPos = +m['index'],
  47              endLen   = 3 + linkInfo.length,
  48              endPos   = startPos + m[0].length - endLen,
  49              alt      = m[0].substr(2, m[0].length - endLen - 2);
  50  
  51          addImageTag(startPos, endPos, endLen, linkInfo, alt);
  52      }
  53  }
  54  
  55  /**
  56  * Parse reference images markup
  57  */
  58  function parseReferenceImages()
  59  {
  60      var m, regexp = /!\[((?:[^\x17[\]]|\[[^\x17[\]]*\])*)\](?: ?\[([^\x17[\]]+)\])?/g;
  61      while (m = regexp.exec(text))
  62      {
  63          var startPos = +m['index'],
  64              endPos   = startPos + 2 + m[1].length,
  65              endLen   = 1,
  66              alt      = m[1],
  67              id       = alt;
  68  
  69          if (m[2] > '' && linkReferences[m[2]])
  70          {
  71              endLen = m[0].length - alt.length - 2;
  72              id     = m[2];
  73          }
  74          else if (!linkReferences[id])
  75          {
  76              continue;
  77          }
  78  
  79          addImageTag(startPos, endPos, endLen, linkReferences[id], alt);
  80      }
  81  }