Remove support for script tags.

sdk/lib/_internal/compiler/implementation/tree/nodes.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.
 
 part of tree;
 
 abstract class Visitor<R> {
   const Visitor();
 
   R visitNode(Node node);
@@ skipping 48 matching lines @@
   R visitOperator(Operator node) => visitIdentifier(node);
   R visitParenthesizedExpression(ParenthesizedExpression node) {
     return visitExpression(node);
   }
   R visitPart(Part node) => visitLibraryTag(node);
   R visitPartOf(PartOf node) => visitNode(node);
   R visitPostfix(Postfix node) => visitNodeList(node);
   R visitPrefix(Prefix node) => visitNodeList(node);
   R visitRethrow(Rethrow node) => visitStatement(node);
   R visitReturn(Return node) => visitStatement(node);
-  R visitScriptTag(ScriptTag node) => visitNode(node);
   R visitSend(Send node) => visitExpression(node);
   R visitSendSet(SendSet node) => visitSend(node);
   R visitStatement(Statement node) => visitNode(node);
   R visitStringNode(StringNode node) => visitExpression(node);
   R visitStringInterpolation(StringInterpolation node) => visitStringNode(node);
   R visitStringInterpolationPart(StringInterpolationPart node) {
     return visitNode(node);
   }
   R visitSwitchCase(SwitchCase node) => visitNode(node);
   R visitSwitchStatement(SwitchStatement node) => visitStatement(node);
@@ skipping 94 matching lines @@
   Modifiers asModifiers() => null;
   NamedArgument asNamedArgument() => null;
   NamedMixinApplication asNamedMixinApplication() => null;
   NodeList asNodeList() => null;
   Operator asOperator() => null;
   ParenthesizedExpression asParenthesizedExpression() => null;
   Part asPart() => null;
   PartOf asPartOf() => null;
   Rethrow asRethrow() => null;
   Return asReturn() => null;
-  ScriptTag asScriptTag() => null;
   Send asSend() => null;
   SendSet asSendSet() => null;
   Statement asStatement() => null;
   StringInterpolation asStringInterpolation() => null;
   StringInterpolationPart asStringInterpolationPart() => null;
   StringJuxtaposition asStringJuxtaposition() => null;
   StringNode asStringNode() => null;
   SwitchCase asSwitchCase() => null;
   SwitchStatement asSwitchStatement() => null;
   Throw asThrow() => null;
@@ skipping 1493 matching lines @@
 
   Token getBeginToken() => labels.getBeginToken();
 
   Token getEndToken() => statement.getEndToken();
 
   bool isValidContinueTarget() => statement.isValidContinueTarget();
 
   Node getBody() => statement;
 }
 
-class ScriptTag extends Node {
-  final Identifier tag;
-  final StringNode argument;
-  final Identifier prefixIdentifier;
-  final StringNode prefix;
-
-  final Token beginToken;
-  final Token endToken;
-
-  ScriptTag(this.tag, this.argument, this.prefixIdentifier, this.prefix,
-            this.beginToken, this.endToken);
-
-  bool isImport() => tag.source == const SourceString("import");
-  bool isSource() => tag.source == const SourceString("source");
-  bool isLibrary() => tag.source == const SourceString("library");
-
-  ScriptTag asScriptTag() => this;
-
-  accept(Visitor visitor) => visitor.visitScriptTag(this);
-
-  visitChildren(Visitor visitor) {
-    tag.accept(visitor);
-    argument.accept(visitor);
-    if (prefixIdentifier != null) prefixIdentifier.accept(visitor);
-    if (prefix != null) prefix.accept(visitor);
-  }
-
-  Token getBeginToken() => beginToken;
-
-  Token getEndToken() => endToken;
-
-  LibraryTag toLibraryTag() {
-    if (isImport()) {
-      Identifier prefixNode;
-      if (prefix != null) {
-        SourceString source = prefix.dartString.source;
-        Token prefixToken = prefix.getBeginToken();
-        Token token = new StringToken.fromSource(IDENTIFIER_INFO, source,
-                                                 prefixToken.charOffset);
-        token.next = prefixToken.next;
-        prefixNode = new Identifier(token);
-      }
-      return new Import(tag.token, argument, prefixNode, null, null);
-    } else if (isLibrary()) {
-      return new LibraryName(tag.token, argument, null);
-    } else if (isSource()) {
-      return new Part(tag.token, argument, null);
-    } else {
-      throw 'Unknown script tag ${tag.token.slowToString()}';
-    }
-  }
-}
-
 abstract class LibraryTag extends Node {
   final Link<MetadataAnnotation> metadata;
 
   LibraryTag(this.metadata);
 
   bool get isLibraryName => false;
   bool get isImport => false;
   bool get isExport => false;
   bool get isPart => false;
   bool get isPartOf => false;
@@ skipping 346 matching lines @@
  * argument).
  *
  * TODO(ahe): This method is controversial, the team needs to discuss
  * if top-level methods are acceptable and what naming conventions to
  * use.
  */
 initializerDo(Node node, f(Node node)) {
   SendSet send = node.asSendSet();
   if (send != null) return f(send.arguments.head);
 }