Template parser

utils/template/htmltree.dart

Index: utils/template/htmltree.dart
diff --git a/utils/template/htmltree.dart b/utils/template/htmltree.dart
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+// 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.
+// Generated by scripts/tree_gen.py.
+
+/////////////////////////////////////////////////////////////////////////
+// CSS specific types:
+/////////////////////////////////////////////////////////////////////////
+
+class Identifier extends ASTNode {
+  String name;
+
+  Identifier(this.name, SourceSpan span): super(span);
+
+  visit(TreeVisitor visitor) => visitor.visitIdentifier(this);
+
+  String toString() => name;
+}
+
+class StringValue extends ASTNode {
+  String value;
+
+  StringValue(this.value, SourceSpan span): super(span);
+
+  visit(TreeVisitor visitor) => visitor.visitStringValue(this);
+
+  String toString() => value;
+}
+
+// CDO/CDC (Comment Definition Open <!-- and Comment Definition Close -->).
+class CommentDefinition extends ASTNode {
+  String comment;
+
+  CommentDefinition(this.comment, SourceSpan span): super(span);
+
+  visit(TreeVisitor visitor) => visitor.visitCommentDefinition(this);
+
+  String toString() => '<!-- ${comment} -->';
+}
+
+class Template extends ASTNode {
+  TemplateSignature signature;
+  TemplateContent content;
+
+  Template(this.signature, this.content, SourceSpan span):
+      super(span);
+
+  visit(TreeVisitor visitor) => visitor.visitTemplate(this);
+
+  String toString() => "${signature.toString()} \r{\r${content.toString()}\r}\r";
+}
+
+class TemplateSignature extends ASTNode {
+  String name;
+  List<Map<Identifier, Identifier>> params;   // Map of {type:, name:}
+
+  TemplateSignature(this.name, this.params, SourceSpan span): super(span);
+
+  visit(TreeVisitor visitor) => visitor.visitTemplateSignature(this);
+
+  String paramsAsString() {
+    StringBuffer buff = new StringBuffer();
+    bool first = true;
+    for (final param in params) {
+      if (!first) {
+        buff.add(", ");
+      }
+      if (param['type'] != null) {
+        buff.add(param['type']);
+        buff.add(' ');
+      }
+      buff.add(param['name']);
+      first = false;
+    }
+
+    return buff.toString();
+  }
+
+  String toString() => "template ${name}(${paramsAsString()})";
+}
+
+class TemplateChildren extends ASTNode {
+  List<ASTNode> children;
+
+  TemplateChildren(this.children, SourceSpan span): super(span);
+  TemplateChildren.empty(SourceSpan span): super(span);
+
+  add(var child) {
+    if (children == null) {
+      children = new List<ASTNode>();
+    }
+    children.add(child);
+  }
+
+  ASTNode last() => children.last();
+  ASTNode removeLast() => children.removeLast();
+  bool get anyChildren() => children != null && children.length > 0;
+
+  visit(TreeVisitor visitor) => visitor.visitTemplateChildren(this);
+
+  String toString() {
+    StringBuffer buff = new StringBuffer();
+    if (children != null) {
+      for (final child in children) {
+        buff.add(child.toString());
+      }
+    }
+
+    return buff.toString();
+  }
+}
+
+class TemplateContent extends ASTNode {
+  css.Stylesheet css;
+  TemplateDocument html;
+
+  TemplateContent(this.css, this.html, SourceSpan span) : super(span);
+
+  visit(TreeVisitor visitor) => visitor.visitTemplateContent(this);
+}
+
+class TemplateDocument extends TemplateChildren {
+  TemplateDocument(List<ASTNode> children, SourceSpan span):
+    super(children, span);
+
+  visit(TreeVisitor visitor) => visitor.visitTemplateDocument(this);
+}
+
+class TemplateElement extends TemplateChildren {
+  int tagTokenId;
+  List<TemplateAttribute> attributes;
+  StringValue _varName;
+
+  TemplateElement(this.tagTokenId, SourceSpan span): super.empty(span);
+  TemplateElement.fragment(SourceSpan span) : super.empty(span), tagTokenId = -1;
+  TemplateElement.attributes(this.tagTokenId, this.attributes, this._varName,
+    SourceSpan span): super.empty(span);
+
+  bool get isFragment() => tagTokenId == -1;
+  bool get anyAttributes() => attributes != null;
+
+  visit(TreeVisitor visitor) => visitor.visitTemplateElement(this);
+
+  bool get hasVar() => _varName != null;
+  String get varName() => hasVar ? _varName.value : null;
+
+  String attributesToString() {
+    StringBuffer buff = new StringBuffer();
+
+    for (final attr in attributes) {
+      buff.add(' ${attr.toString()}');
+    }
+
+    return buff.toString();
+  }
+
+  String get tagName() => isFragment ?
+    'root' : TokenKind.tagNameFromTokenId(tagTokenId);
+
+  String tagStartToString() => "<${tagName} ${attributesToString()}>";
+
+  String tagEndToString() => "</${tagName}>";
+
+  String toString() {
+    StringBuffer buff = new StringBuffer(tagStartToString());
+
+    if (children != null) {
+      for (final child in children) {
+        buff.add(child.toString());
+      }
+
+      buff.add(tagEndToString());
+    }
+
+    return buff.toString();
+  }
+}
+
+class TemplateAttribute extends ASTNode {
+  String name;
+  String value;
+
+  TemplateAttribute(this.name, this.value, SourceSpan span): super(span);
+
+  visit(TreeVisitor visitor) => visitor.visitTemplateAttribute(this);
+
+  String toString() => "${name}=\"${value}\"";
+}
+
+class TemplateText extends ASTNode {
+  String value;
+
+  TemplateText(this.value, SourceSpan span): super(span);
+
+  visit(TreeVisitor visitor) => visitor.visitTemplateText(this);
+
+  String toString() => value;
+}
+
+class TemplateExpression extends ASTNode {
+  String expression;
+
+  TemplateExpression(this.expression, SourceSpan span): super(span);
+
+  visit(TreeVisitor visitor) => visitor.visitTemplateExpression(this);
+
+  String toString() => "\$\{value}";
+}
+
+class TemplateEachCommand extends ASTNode {
+  String listName;
+  TemplateDocument documentFragment;
+
+  TemplateEachCommand(this.listName, this.documentFragment, SourceSpan span):
+    super(span);
+
+  visit(TreeVisitor visitor) => visitor.visitTemplateEachCommand(this);
+
+  String toString() => "\$\{#each ${listName}}";
+}
+
+class TemplateWithCommand extends ASTNode {
+  String objectName;
+  TemplateDocument documentFragment;
+
+  TemplateWithCommand(this.objectName, this.documentFragment, SourceSpan span):
+    super(span);
+
+  visit(TreeVisitor visitor) => visitor.visitTemplateWithCommand(this);
+
+  String toString() => "\$\{#with ${objectName}}";
+}
+
+interface TreeVisitor {
+  void visitIdentifier(Identifier node);
+  void visitStringValue(StringValue node);
+  void visitCommentDefinition(CommentDefinition node);
+  void visitTemplate(Template node);
+  void visitTemplateSignature(TemplateSignature node);
+  void visitTemplateChildren(TemplateChildren node);
+  void visitTemplateDocument(TemplateDocument node);
+  void visitTemplateContent(TemplateContent node);
+  void visitTemplateElement(TemplateElement node);
+  void visitTemplateAttribute(TemplateAttribute node);
+  void visitTemplateText(TemplateText node);
+  void visitTemplateExpression(TemplateExpression node);
+  void visitTemplateEachCommand(TemplateEachCommand node);
+  void visitTemplateWithCommand(TemplateWithCommand node);
+}
+
+class TreePrinter implements TreeVisitor {
+  var output;
+  TreePrinter(this.output) { output.printer = this; }
+
+  void visitIdentifier(Identifier node) {
+    output.heading('Identifier(${output.toValue(node.name)})', node.span);
+  }
+
+  void visitStringValue(StringValue node) {
+    output.heading('"${output.toValue(node.value)}"', node.span);
+  }
+
+  void visitCommentDefinition(CommentDefinition node) {
+    output.heading('CommentDefinition (CDO/CDC)', node.span);
+    output.depth++;
+    output.writeValue('comment value', node.comment);
+    output.depth--;
+  }
+
+  void visitTemplate(Template node) {
+    output.heading('Template', node.span);
+    output.depth++;
+    visitTemplateSignature(node.signature);
+    visitTemplateContent(node.content);
+    output.depth--;
+  }
+
+  void visitTemplateSignature(TemplateSignature node) {
+    output.heading('TemplateSignature', node.span);
+    output.depth++;
+    output.writeValue('Template', node);
+    output.depth--;
+  }
+
+  void visitTemplateChildren(TemplateChildren node) {
+    output.writeNodeList('children', node.children);
+  }
+
+  void visitTemplateContent(TemplateContent node) {
+    visitTemplateDocument(node.html);
+    if (node.css != null) {
+      output.depth++;
+      output.writeValue('---CSS---', node.css.toString());
+      output.depth--;
+    }
+  }
+
+  void visitTemplateDocument(TemplateDocument node) {
+    output.heading('Content', node.span);
+    output.depth++;
+    var child = node.children[0];
+    assert(node.children.length == 1 && child.tagTokenId == -1);
+    output.writeNodeList("document", node.children);
+    output.depth--;
+  }
+
+  void visitTemplateElement(TemplateElement node) {
+    output.heading('Element', node.span);
+    output.depth++;
+    output.writeValue('tag', node.tagName);
+    if (node.attributes != null && (node.attributes.length > 0)) {
+      output.writeNodeList("attributes", node.attributes);
+    }
+    visitTemplateChildren(node);
+    output.depth--;
+  }
+
+  void visitTemplateAttribute(TemplateAttribute node) {
+    output.heading('Attribute', node.span);
+    output.depth++;
+    output.writeValue('name', node.name);
+    output.writeValue('value', node.value);
+    output.depth--;
+  }
+
+  void visitTemplateText(TemplateText node) {
+    output.heading('Text', node.span);
+    output.writeValue('value', node.value);
+  }
+
+  void visitTemplateExpression(TemplateExpression node) {
+    output.heading('Interpolate', node.span);
+    output.writeValue('expression', "\$\{${node.expression}\}");
+  }
+
+  void visitTemplateEachCommand(TemplateEachCommand node) {
+    output.heading('#each', node.span);
+    output.writeValue('list', node.listName);
+    visitTemplateDocument(node.documentFragment);
+  }
+
+  void visitTemplateWithCommand(TemplateWithCommand node) {
+    output.heading('#with', node.span);
+    output.writeValue('object', node.objectName);
+    visitTemplateDocument(node.documentFragment);
+  }
+}
+