Parse script tags with Fasta.

pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart

 // Copyright (c) 2016, 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 fasta.analyzer.ast_builder;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/dart/ast/ast_factory.dart' show AstFactory;
 import 'package:analyzer/dart/ast/standard_ast_factory.dart' as standard;
 import 'package:analyzer/dart/ast/token.dart' as analyzer show Token;
@@ skipping 126 matching lines @@
           internalError(
               "Unexpected part in string interpolation: ${part.runtimeType}");
         }
       }
       elements.add(ast.interpolationString(
           toAnalyzerToken(last), unescapeLastStringPart(last.value, quote)));
       push(ast.stringInterpolation(elements));
     }
   }
 
+  void handleScript(Token token) {
+    debugEvent("Script");
+    push(ast.scriptTag(toAnalyzerToken(token)));
+  }
+
   void handleStringJuxtaposition(int literalCount) {
     debugEvent("StringJuxtaposition");
     push(ast.adjacentStrings(popList(literalCount)));
   }
 
   void endArguments(int count, Token beginToken, Token endToken) {
     debugEvent("Arguments");
     List expressions = popList(count);
     ArgumentList arguments = ast.argumentList(
         toAnalyzerToken(beginToken), expressions, toAnalyzerToken(endToken));
@@ skipping 684 matching lines @@
 
   @override
   void endTopLevelDeclaration(Token token) {
     debugEvent("TopLevelDeclaration");
   }
 
   @override
   void endCompilationUnit(int count, Token token) {
     debugEvent("CompilationUnit");
     analyzer.Token beginToken = null; // TODO(paulberry)
-    ScriptTag scriptTag = null; // TODO(paulberry)
+    ScriptTag scriptTag = null;
     var directives = <Directive>[];
     var declarations = <CompilationUnitMember>[];
     analyzer.Token endToken = null; // TODO(paulberry)
     List<Object> elements = popList(count);
     if (elements != null) {
       for (AstNode node in elements) {
-        if (node is Directive) {
+        if (node is ScriptTag) {
+          scriptTag = node;
+        } else if (node is Directive) {
           directives.add(node);
         } else if (node is CompilationUnitMember) {
           declarations.add(node);
         } else {
           internalError(
               'Unrecognized compilation unit member: ${node.runtimeType}');
         }
       }
     }
     push(ast.compilationUnit(
@@ skipping 614 matching lines @@
       } else if (identical('static', s)) {
         staticKeyword = token;
       } else if (identical('var', s)) {
         finalConstOrVarKeyword = token;
       } else {
         internalError('Unhandled modifier: $s');
       }
     }
   }
 }