Function buildToken

static/editor.md/lib/codemirror/lib/codemirror.js:6771–6822

(builder, text, style, startStyle, endStyle, title, css)

  // Build up the DOM representation for a single token, and add it to
  // the line map. Takes care to render special characters separately.
  function buildToken(builder, text, style, startStyle, endStyle, title, css) {
    if (!text) return;
    var special = builder.cm.options.specialChars, mustWrap = false;
    if (!special.test(text)) {
      builder.col += text.length;
      var content = document.createTextNode(text);
      builder.map.push(builder.pos, builder.pos + text.length, content);
      if (ie && ie_version < 9) mustWrap = true;
      builder.pos += text.length;
    } else {
      var content = document.createDocumentFragment(), pos = 0;
      while (true) {
        special.lastIndex = pos;
        var m = special.exec(text);
        var skipped = m ? m.index - pos : text.length - pos;
        if (skipped) {
          var txt = document.createTextNode(text.slice(pos, pos + skipped));
          if (ie && ie_version < 9) content.appendChild(elt("span", [txt]));
          else content.appendChild(txt);
          builder.map.push(builder.pos, builder.pos + skipped, txt);
          builder.col += skipped;
          builder.pos += skipped;
        }
        if (!m) break;
        pos += skipped + 1;
        if (m[0] == "\t") {
          var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize;
          var txt = content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
          txt.setAttribute("role", "presentation");
          txt.setAttribute("cm-text", "\t");
          builder.col += tabWidth;
        } else {
          var txt = builder.cm.options.specialCharPlaceholder(m[0]);
          txt.setAttribute("cm-text", m[0]);
          if (ie && ie_version < 9) content.appendChild(elt("span", [txt]));
          else content.appendChild(txt);
          builder.col += 1;
        }
        builder.map.push(builder.pos, builder.pos + 1, txt);
        builder.pos++;
      }
    }
    if (style || startStyle || endStyle || mustWrap || css) {
      var fullStyle = style || "";
      if (startStyle) fullStyle += startStyle;
      if (endStyle) fullStyle += endStyle;
      var token = elt("span", [content], fullStyle, css);
      if (title) token.title = title;
      return builder.content.appendChild(token);
    }
    builder.content.appendChild(content);
  }

  function buildTokenSplitSpaces(inner) {
    function split(old) {