Support for @mixin, @include and @extend

pkg/csslib/lib/visitor.dart

 // Copyright (c) 2012, 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.
 
 library csslib.visitor;
 
 import 'package:source_maps/span.dart' show Span;
 import 'parser.dart';
 
 part 'src/css_printer.dart';
 part 'src/tree.dart';
 part 'src/tree_base.dart';
 part 'src/tree_printer.dart';
 
 abstract class VisitorBase {
   void visitCssComment(CssComment node);
   void visitCommentDefinition(CommentDefinition node);
   void visitStyleSheet(StyleSheet node);
+  void visitNoOp(NoOp node);
   void visitTopLevelProduction(TopLevelProduction node);
   void visitDirective(Directive node);
   void visitMediaExpression(MediaExpression node);
   void visitMediaQuery(MediaQuery node);
   void visitMediaDirective(MediaDirective node);
   void visitHostDirective(HostDirective node);
   void visitPageDirective(PageDirective node);
   void visitCharsetDirective(CharsetDirective node);
   void visitImportDirective(ImportDirective node);
   void visitKeyFrameDirective(KeyFrameDirective node);
   void visitKeyFrameBlock(KeyFrameBlock node);
   void visitFontFaceDirective(FontFaceDirective node);
   void visitStyletDirective(StyletDirective node);
   void visitNamespaceDirective(NamespaceDirective node);
   void visitVarDefinitionDirective(VarDefinitionDirective node);
+  void visitMixinDefinition(MixinDefinition node);
+  void visitMixinRulesetDirective(MixinRulesetDirective node);
+  void visitMixinDeclarationDirective(MixinDeclarationDirective node);
+  void visitIncludeDirective(IncludeDirective node);
+  void visitContentDirective(ContentDirective node);
 
   void visitRuleSet(RuleSet node);
   void visitDeclarationGroup(DeclarationGroup node);
   void visitMarginGroup(DeclarationGroup node);
   void visitDeclaration(Declaration node);
   void visitVarDefinition(VarDefinition node);
+  void visitIncludeMixinAtDeclaration(IncludeMixinAtDeclaration node);
+  void visitExtendDeclaration(ExtendDeclaration node);
   void visitSelectorGroup(SelectorGroup node);
   void visitSelector(Selector node);
   void visitSimpleSelectorSequence(SimpleSelectorSequence node);
   void visitSimpleSelector(SimpleSelector node);
   void visitElementSelector(ElementSelector node);
   void visitNamespaceSelector(NamespaceSelector node);
   void visitAttributeSelector(AttributeSelector node);
   void visitIdSelector(IdSelector node);
   void visitClassSelector(ClassSelector node);
   void visitPseudoClassSelector(PseudoClassSelector node);
@@ skipping 61 matching lines @@
       list[index].visit(this);
     }
   }
 
   void visitTree(StyleSheet tree) => visitStyleSheet(tree);
 
   void visitStyleSheet(StyleSheet ss) {
     _visitNodeList(ss.topLevels);
   }
 
+  void visitNoOp(NoOp node) { }
+
   void visitTopLevelProduction(TopLevelProduction node) { }
 
   void visitDirective(Directive node) { }
 
   void visitCssComment(CssComment node) { }
 
   void visitCommentDefinition(CommentDefinition node) { }
 
   void visitMediaExpression(MediaExpression node) {
     visitExpressions(node.exprs);
@@ skipping 55 matching lines @@
   void visitStyletDirective(StyletDirective node) {
     _visitNodeList(node._rulesets);
   }
 
   void visitNamespaceDirective(NamespaceDirective node) { }
 
   void visitVarDefinitionDirective(VarDefinitionDirective node) {
     visitVarDefinition(node.def);
   }
 
+  void visitMixinRulesetDirective(MixinRulesetDirective node) {
+    _visitNodeList(node.rulesets);
+  }
+
+  void visitMixinDefinition(MixinDefinition node) { }
+
+  void visitMixinDeclarationDirective(MixinDeclarationDirective node) {
+    visitDeclarationGroup(node.declarations);
+  }
+
+  void visitIncludeDirective(IncludeDirective node) {
+    for (var index = 0; index < node.args.length; index++) {
+      var param = node.args[index];
+      _visitNodeList(param);
+    }
+  }
+
+  void visitContentDirective(ContentDirective node) {
+    // TODO(terry): TBD
+  }
+
   void visitRuleSet(RuleSet node) {
     visitSelectorGroup(node._selectorGroup);
     visitDeclarationGroup(node._declarationGroup);
   }
 
   void visitDeclarationGroup(DeclarationGroup node) {
     _visitNodeList(node._declarations);
   }
 
   void visitMarginGroup(MarginGroup node) => visitDeclarationGroup(node);
 
   void visitDeclaration(Declaration node) {
     visitIdentifier(node._property);
     if (node._expression != null) node._expression.visit(this);
   }
 
   void visitVarDefinition(VarDefinition node) {
     visitIdentifier(node._property);
     if (node._expression != null) node._expression.visit(this);
   }
 
+  void visitIncludeMixinAtDeclaration(IncludeMixinAtDeclaration node) {
+    visitIncludeDirective(node.include);
+  }
+
+  void visitExtendDeclaration(ExtendDeclaration node) {
+    _visitNodeList(node.selectors);
+  }
+
   void visitSelectorGroup(SelectorGroup node) {
     _visitNodeList(node.selectors);
   }
 
   void visitSelector(Selector node) {
     _visitNodeList(node._simpleSelectorSequences);
   }
 
   void visitSimpleSelectorSequence(SimpleSelectorSequence node) {
     var selector = node._selector;
@@ skipping 209 matching lines @@
   void visitPaddingExpression(PaddingExpression node) {
     // TODO(terry): TBD
     throw UnimplementedError;
   }
 
   void visitWidthExpression(WidthExpression node) {
     // TODO(terry): TBD
     throw UnimplementedError;
   }
 }