HTML-5 Tree Code Generator

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  /* Module function, reading input */
  var buildTreeElements = function(inputTreeText, expandedLevelCharacter, collapsedLevelCharacter)
  {
    var getIndent = function(trimmedLine) {
      var expanded = true;
      var regExp = new RegExp("^\\"+expandedLevelCharacter+"*");
      var level = regExp.exec(trimmedLine)[0].length;
      if (level <= 0) {
        regExp = new RegExp("^\\"+collapsedLevelCharacter+"*");
        level = regExp.exec(trimmedLine)[0].length;
        expanded = false;
      }
      return {
        level: level,
        expanded: expanded
      };
    };
    
    var getTreeElement = function(lines, startLineIndex, precedingTreeElement) {
      var line = lines[startLineIndex].trim();
      var indent = getIndent(line);
      
      if (indent.level <= 0) { /* text nested into previous tree element */
        if (precedingTreeElement === undefined)
          throw "First tree element must start with '"+expandedLevelCharacter+"' or '"+collapsedLevelCharacter+"' character: '"+line+"'";
      
        return getElementContent(lines, startLineIndex, precedingTreeElement.level + 1);
      }
      
      if (precedingTreeElement && indent.level > precedingTreeElement.level + 1) /* would have no parent */
        throw "Tree level too deep: '"+line+"'";
      
      line = line.slice(indent.level, line.length).trim();
      
      return {
        level: indent.level,
        expanded: indent.expanded,
        content: line,
        endLineIndex: startLineIndex
      };
    };
      
    var getElementContent = function(lines, startLineIndex, level) {
      var LINE_SEPARATOR = "<br/>"; /* catenation character for multiple lines */
      var multiLines = lines[startLineIndex].trim();
      var i = startLineIndex + 1;
      var endLineIndex = i;
      
      for (var done = false; ! done && i < lines.length; i++) {
        var nextLine = lines[i].trim();
        var indent = getIndent(nextLine);
        if (indent.level <= 0) {
          multiLines = multiLines + LINE_SEPARATOR + nextLine;
          endLineIndex = i;
        }
        else { /* next tree element detected */
          done = true;
          endLineIndex = i - 1; /* un-read line */
        }
      }
      
      return {
        level: level,
        expanded: undefined,
        content: multiLines,
        endLineIndex: endLineIndex
      };
    };
    
    var buildTreeElementsImpl = function() {
      var lines = inputTreeText.split(/\r?\n/);
      var treeElements = [];
      var index = 0;
      
      while (index < lines.length) {
        if (lines[index].trim()) { /* not empty */
          var precedingTreeElement = (treeElements.length > 0) ? treeElements[treeElements.length - 1] : undefined;
          var treeElement = getTreeElement(lines, index, precedingTreeElement);
          
          treeElements.push(treeElement);
          index = treeElement.endLineIndex + 1;
        }
        else {
          index++;
        }
      }
      
      return treeElements;
    };
    
    return buildTreeElementsImpl();
  };
  
  /* Module function, generating output */
  var outputTree = function(treeElements, htmlPrintln, allElementsAreFolders, rootLevelBold, nonFoldersItalic)
  {
    var hasChildren = function(treeElements, i) {
      if (i >= treeElements.length - 1)
        return false;
        
      return treeElements[i].level < treeElements[i + 1].level;
    };
    
    var printTree = function(treeElements) {
      var INITIAL_LEVEL = 1; /* minimal number of leading dashes */
      var level = INITIAL_LEVEL;
      
      for (var i = 0; i < treeElements.length; i++) {
        var treeElement = treeElements[i];
        
        for (; level > treeElement.level; level--) /* close preceding element */
          htmlPrintln("</details>");
        
        level = treeElement.level;
        
        var isFolder = hasChildren(treeElements, i);
        if (isFolder || (allElementsAreFolders && treeElement.expanded != undefined))
          htmlPrintln(
              "<details "+
              (treeElement.expanded ? "open" : "")+
              " class=\"tree\"><summary>"+
              treeElement.content+
              "</summary>"+
              (isFolder ? "" : "</details>"));
        else
          htmlPrintln(
              "<div class=\"tree\">"+
              treeElement.content+
              "</div>");
      }
      
      for ( ; level > INITIAL_LEVEL; level--)
        htmlPrintln("</details>");
    };
    
    var printTreeStyles = function() {
      htmlPrintln("<style>");
      htmlPrintln("  details.tree {");
      htmlPrintln("    padding-left: 1em;");
      if (rootLevelBold)
        htmlPrintln("    font-weight: bold;");
      htmlPrintln("  }");
      htmlPrintln("  div.tree {");
      htmlPrintln("    padding-left: 2.06em;");
      if (nonFoldersItalic)
        htmlPrintln("    font-style: italic;");
      if (rootLevelBold)
        htmlPrintln("    font-weight: bold;");
      htmlPrintln("  }");
      if (rootLevelBold) {
        htmlPrintln("  details.tree details.tree, details.tree div.tree {");
        htmlPrintln("    font-weight: normal;");
        htmlPrintln("  }");
      }
      htmlPrintln("</style>");
    };
    
    var printHtml5Tree = function() {
      htmlPrintln("<div>");
      printTreeStyles();
      printTree(treeElements);
      htmlPrintln("</div>");
    };
    
    printHtml5Tree();
  };
  
  
  /* Global variables */
  var outputTextarea = document.getElementById("output-tree");
  var sample = document.getElementById("sample");
  
  /* "Generate" callback function */
  var generate = function() {
    var inputTreeArea = document.getElementById("input-tree");
    var inputTreeText = inputTreeArea.value.trim();
    var expandedLevelCharacter = document.getElementById("expandedLevelCharacter").value;
    var collapsedLevelCharacter = document.getElementById("collapsedLevelCharacter").value;
    
    try {
      var treeElements = buildTreeElements(inputTreeText, expandedLevelCharacter, collapsedLevelCharacter);
      outputTextarea.value = ""; /* clear output */
      
      var htmlPrintln = function(htmlText) {
        var currentText = outputTextarea.value;
        outputTextarea.value = (currentText ? currentText+"\n" : "")+htmlText
      };
      
      var allElementsAreFolders = document.getElementById("allElementsAreFolders").checked;
      var rootLevelBold = document.getElementById("rootLevelBold").checked;
      var nonFoldersItalic = document.getElementById("nonFoldersItalic").checked;
      
      outputTree(treeElements, htmlPrintln, allElementsAreFolders, rootLevelBold, nonFoldersItalic);
      
      toHtml();
    }
    catch (error) {
      alert(error);
    }
  };
  
  /* "Display" callback function */
  var toHtml = function() {
    sample.innerHTML =  outputTextarea.value;
  };
  
  /* "Copy" callback function */
  var copyToClipboard = function() {
    document.getElementById('output-tree').select();
    document.execCommand('copy');
  };