Removed obsolete code

utils/template/codegen.dart

Index: utils/template/codegen.dart
diff --git a/utils/template/codegen.dart b/utils/template/codegen.dart
deleted file mode 100644
index d2b07ab7ff25ed4a9a11aea24ef3f6e91d2582bf..0000000000000000000000000000000000000000
--- a/utils/template/codegen.dart
+++ /dev/null
@@ -1,1013 +0,0 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-class CGBlock {
-  int _blockType;             // Code type of this block
-  int _indent;                // Number of spaces to prefix for each statement
-  bool _inEach;               // This block or any currently active blocks is a
-                              // #each.  If so then any element marked with a
-                              // var attribute is repeated therefore the var
-                              // is a List type instead of an Element type.
-  String _localName;          // optional local name for #each or #with
-  List<CGStatement> _stmts;
-  int localIndex;             // Local variable index (e.g., e0, e1, etc.)
-
-  // Block Types:
-  static const int CONSTRUCTOR = 0;
-  static const int EACH = 1;
-  static const int WITH = 2;
-
-  CGBlock([this._indent = 4,
-           this._blockType = CGBlock.CONSTRUCTOR,
-           this._inEach = false,
-           this._localName = null]) :
-      _stmts = new List<CGStatement>(), localIndex = 0 {
-    assert(_blockType >= CGBlock.CONSTRUCTOR && _blockType <= CGBlock.WITH);
-  }
-
-  bool get anyStatements => !_stmts.isEmpty;
-  bool get isConstructor => _blockType == CGBlock.CONSTRUCTOR;
-  bool get isEach => _blockType == CGBlock.EACH;
-  bool get isWith => _blockType == CGBlock.WITH;
-
-  bool get hasLocalName => _localName != null;
-  String get localName => _localName;
-
-  CGStatement push(var elem, var parentName, [bool exact = false]) {
-    var varName;
-    if (elem is TemplateElement && elem.hasVar) {
-      varName = elem.varName;
-    } else {
-      varName = localIndex++;
-    }
-
-    CGStatement stmt = new CGStatement(elem, _indent, parentName, varName,
-        exact, _inEach);
-    _stmts.add(stmt);
-
-    return stmt;
-  }
-
-  void pop() {
-    _stmts.removeLast();
-  }
-
-  void add(String value) {
-    if (_stmts.last != null) {
-      _stmts.last.add(value);
-    }
-  }
-
-  CGStatement get last => _stmts.length > 0 ? _stmts.last : null;
-
-  /**
-   * Returns mixed list of elements marked with the var attribute.  If the
-   * element is inside of a #each the name exposed is:
-   *
-   *      List varName;
-   *
-   * otherwise it's:
-   *
-   *      var varName;
-   *
-   * TODO(terry): For scalars var varName should be Element tag type e.g.,
-   *
-   *                   DivElement varName;
-   */
-  String get globalDeclarations {
-    StringBuffer buff = new StringBuffer();
-    for (final CGStatement stmt in _stmts) {
-      buff.write(stmt.globalDeclaration());
-    }
-
-    return buff.toString();
-  }
-
-  /**
-   * List of statement constructors for each var inside a #each.
-   *
-   *    ${#each products}
-   *      <div var=myVar>...</div>
-   *    ${/each}
-   *
-   * returns:
-   *
-   *    myVar = [];
-   */
-  String get globalInitializers {
-    StringBuffer buff = new StringBuffer();
-    for (final CGStatement stmt in _stmts) {
-      buff.write(stmt.globalInitializers());
-    }
-
-    return buff.toString();
-  }
-
-  String get codeBody {
-    StringBuffer buff = new StringBuffer();
-
-    for (final CGStatement stmt in _stmts) {
-      buff.write(stmt.emitDartStatement());
-    }
-
-    return buff.toString();
-  }
-}
-
-class CGStatement {
-  bool _exact;                  // If True not HTML construct instead exact stmt
-  bool _repeating;              // Stmt in a #each this block or nested block.
-  StringBuffer _buff;
-  var _elem;
-  int _indent;
-  var parentName;
-  String varName;
-  bool _globalVariable;
-  bool _closed;
-
-  CGStatement(this._elem, this._indent, this.parentName, var varNameOrIndex,
-      [this._exact = false, this._repeating = false]) :
-        _buff = new StringBuffer(), _closed = false {
-
-    if (varNameOrIndex is String) {
-      // We have the global variable name
-      varName = varNameOrIndex;
-      _globalVariable = true;
-    } else {
-      // local index generate local variable name.
-      varName = "e${varNameOrIndex}";
-      _globalVariable = false;
-    }
-  }
-
-  bool get hasGlobalVariable => _globalVariable;
-  String get variableName => varName;
-
-  String globalDeclaration() {
-    if (hasGlobalVariable) {
-      String spaces = Codegen.spaces(_indent);
-      return (_repeating) ?
-        "  List ${varName};    // Repeated elements.\n" : "  var ${varName};\n";
-    }
-
-    return "";
-  }
-
-  String globalInitializers() {
-    if (hasGlobalVariable && _repeating) {
-      return "    ${varName} = [];\n";
-    }
-
-    return "";
-  }
-
-  void add(String value) {
-    _buff.write(value);
-  }
-
-  bool get isClosed => _closed;
-
-  void close() {
-    if (_elem is TemplateElement && _elem.scoped) {
-      add("</${_elem.tagName}>");
-    }
-    _closed = true;
-  }
-
-  String emitDartStatement() {
-    StringBuffer statement = new StringBuffer();
-
-    String spaces = Codegen.spaces(_indent);
-
-    if (_exact) {
-      statement.add("${spaces}${_buff.toString()};\n");
-    } else {
-      String localVar = "";
-      String tmpRepeat;
-      if (hasGlobalVariable) {
-        if (_repeating) {
-          tmpRepeat = "tmp_${varName}";
-          localVar = "var ";
-        }
-      } else {
-        localVar = "var ";
-      }
-
-      /* Emiting the following code fragment where varName is the attribute
-         value for var=
-
-            varName = new Element.html('HTML GOES HERE');
-            parent.elements.add(varName);
-
-         for repeating elements in a #each:
-
-            var tmp_nnn = new Element.html('HTML GOES HERE');
-            varName.add(tmp_nnn);
-            parent.elements.add(tmp_nnn);
-
-         for elements w/o var attribute set:
-
-            var eNNN = new Element.html('HTML GOES HERE');
-            parent.elements.add(eNNN);
-       */
-      if (_elem is TemplateCall) {
-        // Call template NameEntry2
-        String cls = _elem.toCall;
-        String params = _elem.params;
-        statement.add("\n${spaces}// Call template ${cls}.\n");
-        statement.add(
-            "${spaces}${localVar}${varName} = new ${cls}${params};\n");
-        statement.add(
-            "${spaces}${parentName}.elements.add(${varName}.root);\n");
-      } else {
-        bool isTextNode = _elem is TemplateText;
-        String createType = isTextNode ? "Text" : "Element.html";
-        if (tmpRepeat == null) {
-          statement.add("${spaces}${localVar}${varName} = new ${createType}('");
-        } else {
-          statement.add(
-              "${spaces}${localVar}${tmpRepeat} = new ${createType}('");
-        }
-        statement.add(isTextNode ? _buff.toString().trim() : _buff.toString());
-
-        if (tmpRepeat == null) {
-          statement.add(
-            "');\n${spaces}${parentName}.elements.add(${varName});\n");
-        } else {
-          statement.add(
-            "');\n${spaces}${parentName}.elements.add(${tmpRepeat});\n");
-          statement.add("${spaces}${varName}.add(${tmpRepeat});\n");
-        }
-      }
-    }
-
-    return statement.toString();
-  }
-}
-
-class Codegen {
-  static const String SPACES = "                                              ";
-  static String spaces(int numSpaces) {
-    return SPACES.substring(0, numSpaces);
-  }
-
-  // TODO(terry): Before generating Dart class need a validate phase that
-  //              checks mangles all class names to be prefix with the
-  //              template name to avoid any class name collisions.  Also,
-  //              investigate possible runtime check mode to insure that only
-  //              valid CSS class names are used (in case someone uses strings
-  //              and not the generated getters to the CSS class selector.  This
-  //              mode would be slower would require that every class name set
-  //              (maybe jQuery too) is for a particular view (requires walking
-  //              the HTML tree looking for a parent template prefix that
-  //              matches the CSS prefix. (more thinking needed).
-  static String generate(List<Template> templates, String filename) {
-    List<String> fileParts = filename.split('.');
-    assert(fileParts.length == 2);
-    filename = fileParts[0];
-
-    StringBuffer buff = new StringBuffer();
-    int injectId = 0;         // Inject function id
-
-    buff.write("// Generated Dart class from HTML template.\n");
-    buff.write("// DO NOT EDIT.\n\n");
-
-    String addStylesheetFuncName = "add_${filename}_templatesStyles";
-
-    for (final template in templates) {
-      // Emit the template class.
-      TemplateSignature sig = template.signature;
-      buff.write(_emitClass(sig.name, sig.params, template.content,
-        addStylesheetFuncName));
-    }
-
-    // TODO(terry): Stylesheet aggregator should not be global needs to be
-    //              bound to this template file not global to the app.
-
-    // Emit the stylesheet aggregator.
-    buff.write("\n\n// Inject all templates stylesheet once into the head.\n");
-    buff.write("bool ${filename}_stylesheet_added = false;\n");
-    buff.write("void ${addStylesheetFuncName}() {\n");
-    buff.write("  if (!${filename}_stylesheet_added) {\n");
-    buff.write("    StringBuffer styles = new StringBuffer();\n\n");
-
-    buff.write("    // All templates stylesheet.\n");
-
-    for (final template in templates) {
-      TemplateSignature sig = template.signature;
-      buff.write("    styles.add(${sig.name}.stylesheet);\n");
-    }
-
-    buff.write("\n    ${filename}_stylesheet_added = true;\n");
-
-    buff.write("    document.head.elements.add(new Element.html('<style>"
-             "\${styles.toString()}</style>'));\n");
-    buff.write("  }\n");
-    buff.write("}\n");
-
-    return buff.toString();
-  }
-
-  static String _emitCSSSelectors(css.Stylesheet stylesheet) {
-    if (stylesheet == null) {
-      return "";
-    }
-
-    List<String> classes = [];
-
-    for (final production in stylesheet.topLevels) {
-      if (production is css.IncludeDirective) {
-        for (final topLevel in production.styleSheet.topLevels) {
-          if (topLevel is css.RuleSet) {
-            classes = css.Generate.computeClassSelectors(topLevel, classes);
-          }
-        }
-      } else if (production is css.RuleSet) {
-        classes = css.Generate.computeClassSelectors(production, classes);
-      }
-    }
-
-    List<String> dartNames = [];
-
-    for (final String knownClass in classes) {
-      StringBuffer dartName = new StringBuffer();
-      List<String> splits = knownClass.split('-');
-      if (splits.length > 0) {
-        dartName.add(splits[0]);
-        for (int idx = 1; idx < splits.length; idx++) {
-          String part = splits[idx];
-          // Character between 'a'..'z' mapped to 'A'..'Z'
-          dartName.add("${part[0].toUpperCase()}${part.substring(1)}");
-        }
-        dartNames.add(dartName.toString());
-      }
-    }
-
-    StringBuffer buff = new StringBuffer();
-    if (classes.length > 0) {
-      assert(classes.length == dartNames.length);
-      buff.write("\n  // CSS class selectors for this template.\n");
-      for (int i = 0; i < classes.length; i++) {
-        buff.write(
-          "  static String get ${dartNames[i]} => \"${classes[i]}\";\n");
-      }
-    }
-
-    return buff.toString();
-  }
-
-  static String _emitClass(String className,
-                           List<Map<Identifier, Identifier>> params,
-                           TemplateContent content,
-                           String addStylesheetFuncName) {
-    StringBuffer buff = new StringBuffer();
-
-    // Emit the template class.
-    buff.write("class ${className} {\n");
-
-    buff.write("  Map<String, Object> _scopes;\n");
-    buff.write("  Element _fragment;\n\n");
-
-    bool anyParams = false;
-    for (final param in params) {
-      buff.write("  ${param['type']} ${param['name']};\n");
-      anyParams = true;
-    }
-    if (anyParams) buff.write("\n");
-
-    ElemCG ecg = new ElemCG();
-
-    if (!ecg.pushBlock()) {
-      world.error("Error at ${content}");
-    }
-
-    var root = content.html.children.length > 0 ? content.html.children[0] :
-        content.html;
-    bool firstTime = true;
-    for (var child in root.children) {
-      if (child is TemplateText) {
-        if (!firstTime) {
-          ecg.closeStatement();
-        }
-
-        String textNodeValue = child.value.trim();
-        if (textNodeValue.length > 0) {
-          CGStatement stmt = ecg.pushStatement(child, "_fragment");
-        }
-      }
-      ecg.emitConstructHtml(child, "", "_fragment");
-      firstTime = false;
-    }
-
-    // Create all element names marked with var.
-    String decls = ecg.globalDeclarations;
-    if (decls.length > 0) {
-      buff.write("\n  // Elements bound to a variable:\n");
-      buff.write("${decls}\n");
-    }
-
-    // Create the constructor.
-    buff.write("  ${className}(");
-    bool firstParam = true;
-    for (final param in params) {
-      if (!firstParam) {
-        buff.write(", ");
-      }
-      buff.write("this.${param['name']}");
-      firstParam = false;
-    }
-    buff.write(") : _scopes = new Map<String, Object>() {\n");
-
-    String initializers = ecg.globalInitializers;
-    if (initializers.length > 0) {
-      buff.write("    //Global initializers.\n");
-      buff.write("${initializers}\n");
-    }
-
-    buff.write("    // Insure stylesheet for template exist in the document.\n");
-    buff.write("    ${addStylesheetFuncName}();\n\n");
-
-    buff.write("    _fragment = new DocumentFragment();\n");
-
-    buff.write(ecg.codeBody);     // HTML for constructor to build.
-
-    buff.write("  }\n\n");        // End constructor
-
-    buff.write(emitGetters(content.getters));
-
-    buff.write("  Element get root => _fragment;\n");
-
-    // Emit all CSS class selectors:
-    buff.write(_emitCSSSelectors(content.css));
-
-    // Emit the injection functions.
-    buff.write("\n  // Injection functions:");
-    for (final expr in ecg.expressions) {
-      buff.write("${expr}");
-    }
-
-    buff.write("\n  // Each functions:\n");
-    for (var eachFunc in ecg.eachs) {
-      buff.write("${eachFunc}\n");
-    }
-
-    buff.write("\n  // With functions:\n");
-    for (var withFunc in ecg.withs) {
-      buff.write("${withFunc}\n");
-    }
-
-    buff.write("\n  // CSS for this template.\n");
-    buff.write("  static const String stylesheet = ");
-
-    if (content.css != null) {
-      buff.write("\'\'\'\n    ${content.css.toString()}\n");
-      buff.write("  \'\'\';\n\n");
-
-      // TODO(terry): Emit all known selectors for this template.
-      buff.write("  // Stylesheet class selectors:\n");
-    } else {
-      buff.write("\"\";\n");
-    }
-
-    buff.write("  String safeHTML(String html) {\n");
-    buff.write("    // TODO(terry): Escaping for XSS vulnerabilities TBD.\n");
-    buff.write("    return html;\n");
-    buff.write("  }\n");
-
-    buff.write("}\n");              // End class
-
-    return buff.toString();
-  }
-
-  // TODO(terry): Need to generate function to inject any TemplateExpressions
-  //              to call SafeHTML wrapper.
-  static String emitGetters(List<TemplateGetter> getters) {
-    StringBuffer buff = new StringBuffer();
-    for (final TemplateGetter getter in getters) {
-      buff.write('  String ${getter.getterSignatureAsString()} {\n');
-      buff.write('    return \'\'\'');
-      var docFrag = getter.docFrag.children[0];
-      for (final child in docFrag.children) {
-        buff.write(child.toString().trim());
-      }
-      buff.write('\'\'\';\n');
-      buff.write('  }\n\n');
-    }
-
-    return buff.toString();
-  }
-}
-
-class ElemCG {
-  // List of identifiers and quoted strings (single and double quoted).
-  var identRe = new RegExp(
-    "\s*('\"\\'\\\"[^'\"\\'\\\"]+'\"\\'\\\"|[_A-Za-z][_A-Za-z0-9]*)");
-
-  List<CGBlock> _cgBlocks;
-  StringBuffer _globalDecls;        // Global var declarations for all blocks.
-  StringBuffer _globalInits;        // Global List var initializtion for all
-                                    // blocks in a #each.
-  String funcCall;                  // Func call after element creation?
-  List<String> expressions;         // List of injection function declarations.
-  List<String> eachs;               // List of each function declarations.
-  List<String> withs;               // List of with function declarations.
-
-  ElemCG() :
-    expressions = [],
-    eachs = [],
-    withs = [],
-    _cgBlocks = [],
-    _globalDecls = new StringBuffer(),
-    _globalInits = new StringBuffer();
-
-  bool get isLastBlockConstructor {
-    CGBlock block = _cgBlocks.last;
-    return block.isConstructor;
-  }
-
-  List<String> activeBlocksLocalNames() {
-    List<String> result = [];
-
-    for (final CGBlock block in _cgBlocks) {
-      if (block.isEach || block.isWith) {
-        if (block.hasLocalName) {
-          result.add(block.localName);
-        }
-      }
-    }
-
-    return result;
-  }
-
-  /**
-   * Active block with this localName.
-   */
-  bool matchBlocksLocalName(String name) {
-    for (final CGBlock block in _cgBlocks) {
-      if (block.isEach || block.isWith) {
-        if (block.hasLocalName && block.localName == name) {
-          return true;
-        }
-      }
-    }
-
-    return false;
-  }
-
-  /**
-   * Any active blocks?
-   */
-  bool isNestedBlock() {
-    for (final CGBlock block in _cgBlocks) {
-      if (block.isEach || block.isWith) {
-        return true;
-      }
-    }
-
-    return false;
-  }
-
-  /**
-   * Any active blocks with localName?
-   */
-  bool isNestedNamedBlock() {
-    for (final CGBlock block in _cgBlocks) {
-      if ((block.isEach || block.isWith) && block.hasLocalName) {
-        return true;
-      }
-    }
-
-    return false;
-  }
-
-  // Any current active #each blocks.
-  bool anyEachBlocks(int blockToCreateType) {
-    bool result = blockToCreateType == CGBlock.EACH;
-
-    for (final CGBlock block in _cgBlocks) {
-      if (block.isEach) {
-        result = result || true;
-      }
-    }
-
-    return result;
-  }
-
-  bool pushBlock([int indent = 4, int blockType = CGBlock.CONSTRUCTOR,
-                  String itemName = null]) {
-    if (itemName != null && matchBlocksLocalName(itemName)) {
-      world.error("Active block already exist with local name: ${itemName}.");
-      return false;
-    } else if (itemName == null && this.isNestedBlock()) {
-      world.error('''
-Nested #each or #with must have a localName;
- \n  #each list [localName]\n  #with object [localName]''');
-      return false;
-    }
-    _cgBlocks.add(
-        new CGBlock(indent, blockType, anyEachBlocks(blockType), itemName));
-
-    return true;
-  }
-
-  void popBlock() {
-    _globalDecls.add(lastBlock.globalDeclarations);
-    _globalInits.add(lastBlock.globalInitializers);
-    _cgBlocks.removeLast();
-  }
-
-  CGStatement pushStatement(var elem, var parentName) {
-    return lastBlock.push(elem, parentName, false);
-  }
-
-  CGStatement pushExactStatement(var elem, var parentName) {
-    return lastBlock.push(elem, parentName, true);
-  }
-
-  bool get isClosedStatement {
-    return (lastBlock != null && lastBlock.last != null) ?
-        lastBlock.last.isClosed : false;
-  }
-
-  void closeStatement() {
-    if (lastBlock != null && lastBlock.last != null &&
-        !lastBlock.last.isClosed) {
-      lastBlock.last.close();
-    }
-  }
-
-  String get lastVariableName {
-    if (lastBlock != null && lastBlock.last != null) {
-      return lastBlock.last.variableName;
-    }
-  }
-
-  String get lastParentName {
-    if (lastBlock != null && lastBlock.last != null) {
-      return lastBlock.last.parentName;
-    }
-  }
-
-  CGBlock get lastBlock => _cgBlocks.length > 0 ? _cgBlocks.last : null;
-
-  void add(String str) {
-    _cgBlocks.last.add(str);
-  }
-
-  String get globalDeclarations {
-    assert(_cgBlocks.length == 1);    // Only constructor body should be left.
-    _globalDecls.add(lastBlock.globalDeclarations);
-    return _globalDecls.toString();
-  }
-
-  String get globalInitializers {
-    assert(_cgBlocks.length == 1);    // Only constructor body should be left.
-    _globalInits.add(lastBlock.globalInitializers);
-    return _globalInits.toString();
-  }
-
-  String get codeBody {
-    closeStatement();
-    return _cgBlocks.last.codeBody;
-  }
-
-  /* scopeName for expression
-   * parentVarOrIndex if # it's a local variable if string it's an exposed
-   * name (specified by the var attribute) for this element.
-   *
-   */
-  emitElement(var elem,
-              [String scopeName = "",
-               var parentVarOrIdx = 0,
-               bool immediateNestedEach = false]) {
-    if (elem is TemplateElement) {
-      if (!elem.isFragment) {
-        add("<${elem.tagName}${elem.attributesToString()}>");
-      }
-      String prevParent = lastVariableName;
-      for (var childElem in elem.children) {
-        if (childElem is TemplateElement) {
-          closeStatement();
-          if (childElem.hasVar) {
-            emitConstructHtml(childElem, scopeName, prevParent,
-              childElem.varName);
-          } else {
-            emitConstructHtml(childElem, scopeName, prevParent);
-          }
-          closeStatement();
-        } else {
-          emitElement(childElem, scopeName, parentVarOrIdx);
-        }
-      }
-
-      // Close this tag.
-      closeStatement();
-    } else if (elem is TemplateText) {
-      String outputValue = elem.value.trim();
-      if (outputValue.length > 0) {
-        bool emitTextNode = false;
-        if (isClosedStatement) {
-          String prevParent = lastParentName;
-          CGStatement stmt = pushStatement(elem, prevParent);
-          emitTextNode = true;
-        }
-
-        // TODO(terry): Need to interpolate following:
-        //      {sp}  → space
-        //      {nil} → empty string
-        //      {\r}  → carriage return
-        //      {\n}  → new line (line feed)
-        //      {\t}  → tab
-        //      {lb}  → left brace
-        //      {rb}  → right brace
-
-        add("${outputValue}");            // remove leading/trailing whitespace.
-
-        if (emitTextNode) {
-          closeStatement();
-        }
-      }
-    } else if (elem is TemplateExpression) {
-      emitExpressions(elem, scopeName);
-    } else if (elem is TemplateEachCommand) {
-      // Signal to caller new block coming in, returns "each_" prefix
-      emitEach(elem, "List", elem.listName.name, "parent", immediateNestedEach,
-          elem.hasLoopItem ? elem.loopItem.name : null);
-    } else if (elem is TemplateWithCommand) {
-      // Signal to caller new block coming in, returns "each_" prefix
-      emitWith(elem, "var", elem.objectName.name, "parent",
-          elem.hasBlockItem ? elem.blockItem.name : null);
-    } else if (elem is TemplateCall) {
-      emitCall(elem, parentVarOrIdx);
-    }
-  }
-
-  // TODO(terry): Hack prefixing all names with "${scopeName}." but don't touch
-  //              quoted strings.
-  String _resolveNames(String expr, String prefixPart) {
-    StringBuffer newExpr = new StringBuffer();
-    Iterable<Match> matches = identRe.allMatches(expr);
-
-    int lastIdx = 0;
-    for (Match m in matches) {
-      if (m.start > lastIdx) {
-        newExpr.add(expr.substring(lastIdx, m.start));
-      }
-
-      bool identifier = true;
-      if (m.start > 0)  {
-        int charCode = expr.codeUnitAt(m.start - 1);
-        // Starts with ' or " then it's not an identifier.
-        identifier = charCode != 34 /* " */ && charCode != 39 /* ' */;
-      }
-
-      String strMatch = expr.substring(m.start, m.end);
-      if (identifier) {
-        newExpr.add("${prefixPart}.${strMatch}");
-      } else {
-        // Quoted string don't touch.
-        newExpr.add("${strMatch}");
-      }
-      lastIdx = m.end;
-    }
-
-    if (expr.length > lastIdx) {
-      newExpr.add(expr.substring(lastIdx));
-    }
-
-    return newExpr.toString();
-  }
-
-  /**
-   * Construct the HTML each top-level node get's it's own variable.
-   *
-   * TODO(terry): Might want to optimize if the other top-level nodes have no
-   *              control structures (with, each, if, etc.). We could
-   *              synthesize a root node and create all the top-level nodes
-   *              under the root node with one innerHTML.
-   */
-  void emitConstructHtml(var elem,
-                         [String scopeName = "",
-                          String parentName = "parent",
-                          var varIndex = 0,
-                          bool immediateNestedEach = false]) {
-    if (elem is TemplateElement) {
-      CGStatement stmt = pushStatement(elem, parentName);
-      emitElement(elem, scopeName, stmt.hasGlobalVariable ?
-          stmt.variableName : varIndex);
-    } else {
-      emitElement(elem, scopeName, varIndex, immediateNestedEach);
-    }
-  }
-
-  /* Any references to products.sales needs to be remaped to item.sales
-   * for now it's a hack look for first dot and replace with item.
-   */
-  String eachIterNameToItem(String iterName) {
-    String newName = iterName;
-    var dotForIter = iterName.indexOf('.');
-    if (dotForIter >= 0) {
-      newName = "_item${iterName.substring(dotForIter)}";
-    }
-
-    return newName;
-  }
-
-  emitExpressions(TemplateExpression elem, String scopeName) {
-    StringBuffer func = new StringBuffer();
-
-    String newExpr = elem.expression;
-    bool anyNesting = isNestedNamedBlock();
-    if (scopeName.length > 0 && !anyNesting) {
-      // In a block #command need the scope passed in.
-      add("\$\{inject_${expressions.length}(_item)\}");
-      func.add("\n  String inject_${expressions.length}(var _item) {\n");
-      // Escape all single-quotes, this expression is embedded as a string
-      // parameter for the call to safeHTML.
-      newExpr = _resolveNames(newExpr.replaceAll("'", "\\'"), "_item");
-    } else {
-      // Not in a block #command item isn't passed in.
-      add("\$\{inject_${expressions.length}()\}");
-      func.add("\n  String inject_${expressions.length}() {\n");
-
-      if (anyNesting) {
-        func.add(defineScopes());
-      }
-    }
-
-    // Construct the active scope names for name resolution.
-
-    func.add("    return safeHTML('\$\{${newExpr}\}');\n");
-    func.add("  }\n");
-
-    expressions.add(func.toString());
-  }
-
-  emitCall(TemplateCall elem, String scopeName) {
-    pushStatement(elem, scopeName);
-  }
-
-  emitEach(TemplateEachCommand elem, String iterType, String iterName,
-      var parentVarOrIdx, bool nestedImmediateEach, [String itemName = null]) {
-    TemplateDocument docFrag = elem.documentFragment;
-
-    int eachIndex = eachs.length;
-    eachs.add("");
-
-    StringBuffer funcBuff = new StringBuffer();
-    // Prepare function call "each_N(iterName," parent param computed later.
-    String funcName = "each_${eachIndex}";
-
-    funcBuff.add("  ${funcName}(${iterType} items, Element parent) {\n");
-
-    String paramName = injectParamName(itemName);
-    if (paramName == null) {
-      world.error("Use a different local name; ${itemName} is reserved.");
-    }
-    funcBuff.add("    for (var ${paramName} in items) {\n");
-
-    if (!pushBlock(6, CGBlock.EACH, itemName)) {
-      world.error("Error at ${elem}");
-    }
-
-    addScope(6, funcBuff, itemName);
-
-    TemplateElement docFragChild = docFrag.children[0];
-    var children = docFragChild.isFragment ?
-        docFragChild.children : docFrag.children;
-    for (var child in children) {
-      // If any immediate children of the parent #each is an #each then
-      // so we need to pass the outer #each parent not the last statement's
-      // variableName when calling the nested #each.
-      bool eachChild = (child is TemplateEachCommand);
-      emitConstructHtml(child, iterName, parentVarOrIdx, 0, eachChild);
-    }
-
-    funcBuff.add(codeBody);
-
-    removeScope(6, funcBuff, itemName);
-
-    popBlock();
-
-    funcBuff.add("    }\n");
-    funcBuff.add("  }\n");
-
-    eachs[eachIndex] = funcBuff.toString();
-
-    // If nested each then we want to pass the parent otherwise we'll use the
-    // varName.
-    var varName = nestedImmediateEach ? "parent" : lastBlockVarName;
-
-    pushExactStatement(elem, parentVarOrIdx);
-
-    // Setup call to each func as "each_n(xxxxx, " the parent param is filled
-    // in later when we known the parent variable.
-    String eachParam =
-        (itemName == null) ? eachIterNameToItem(iterName) : iterName;
-    add("${funcName}(${eachParam}, ${varName})");
-}
-
-  emitWith(TemplateWithCommand elem, String withType, String withName,
-      var parentVarIndex, [String itemName = null]) {
-    TemplateDocument docFrag = elem.documentFragment;
-
-    int withIndex = withs.length;
-    withs.add("");
-
-    StringBuffer funcBuff = new StringBuffer();
-    // Prepare function call "each_N(iterName," parent param computed later.
-    String funcName = "with_${withIndex}";
-
-    String paramName = injectParamName(itemName);
-    if (paramName == null) {
-      world.error("Use a different local name; ${itemName} is reserved.");
-    }
-    funcBuff.add("  ${funcName}(${withType} ${paramName}, Element parent) {\n");
-
-    if (!pushBlock(4, CGBlock.WITH, itemName)) {
-      world.error("Error at ${elem}");
-    }
-
-    TemplateElement docFragChild = docFrag.children[0];
-    var children = docFragChild.isFragment ?
-        docFragChild.children : docFrag.children;
-    for (var child in children) {
-      emitConstructHtml(child, withName, "parent");
-    }
-
-    addScope(4, funcBuff, itemName);
-    funcBuff.add(codeBody);
-    removeScope(4, funcBuff, itemName);
-
-    popBlock();
-
-    funcBuff.add("  }\n");
-
-    withs[withIndex] = funcBuff.toString();
-
-    // Compute parent node variable before pushing with statement.
-    String parentVarName = lastBlockVarName;
-
-    pushExactStatement(elem, parentVarIndex);
-
-    // Setup call to each func as "each_n(xxxxx, " the parent param is filled
-    // in later when we known the parent variable.
-    add("${funcName}(${withName}, ${parentVarName})");
-  }
-
-  String get lastBlockVarName {
-    var varName;
-    if (lastBlock != null && lastBlock.anyStatements) {
-      varName = lastBlock.last.variableName;
-    } else {
-      varName = "_fragment";
-    }
-
-    return varName;
-  }
-
-  String injectParamName(String name) {
-    // Local name _item is reserved.
-    if (name != null && name == "_item") {
-      return null;    // Local name is not valid.
-    }
-
-    return (name == null) ? "_item" : name;
-  }
-
-  addScope(int indent, StringBuffer buff, String item) {
-    String spaces = Codegen.spaces(indent);
-
-    if (item == null) {
-      item = "_item";
-    }
-    buff.write("${spaces}_scopes[\"${item}\"] = ${item};\n");
-  }
-
-  removeScope(int indent, StringBuffer buff, String item) {
-    String spaces = Codegen.spaces(indent);
-
-    if (item == null) {
-      item = "_item";
-    }
-    buff.write("${spaces}_scopes.remove(\"${item}\");\n");
-  }
-
-  String defineScopes() {
-    StringBuffer buff = new StringBuffer();
-
-    // Construct the active scope names for name resolution.
-    List<String> names = activeBlocksLocalNames();
-    if (names.length > 0) {
-      buff.write("    // Local scoped block names.\n");
-      for (String name in names) {
-        buff.write("    var ${name} = _scopes[\"${name}\"];\n");
-      }
-      buff.write("\n");
-    }
-
-    return buff.toString();
-  }
-
-}