First step of support for parsing and ignoring generic methods.

pkg/compiler/lib/src/patch_parser.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.
 
 /**
  * This library contains the infrastructure to parse and integrate patch files.
  *
  * Three types of elements can be patched: [LibraryElement], [ClassElement],
  * [FunctionElement]. Patches are introduced in patch libraries which are loaded
  * together with the corresponding origin library. Which libraries that are
@@ skipping 123 matching lines @@
     MetadataAnnotationX,
     SetterElementX;
 import 'js_backend/js_backend.dart' show
     JavaScriptBackend;
 import 'library_loader.dart' show
     LibraryLoader;
 import 'parser/listener.dart' show
     Listener,
     ParserError;
 import 'parser/element_listener.dart' show
-    ElementListener;
+    ElementListener,
+    ParserOptions;
 import 'parser/member_listener.dart' show
     MemberListener;
 import 'parser/partial_elements.dart' show
-  PartialClassElement;
+    PartialClassElement;
 import 'parser/partial_parser.dart' show
     PartialParser;
 import 'parser/parser.dart' show
     Parser;
 import 'scanner/scanner.dart' show
     Scanner;
 import 'script.dart';
 import 'tokens/token.dart' show
     StringToken,
     Token;
 
 class PatchParserTask extends CompilerTask {
   final String name = "Patching Parser";
   final bool _enableConditionalDirectives;
+  final bool _enableGenericMethods;
 
-  PatchParserTask(Compiler compiler, {bool enableConditionalDirectives})
-      : this._enableConditionalDirectives = enableConditionalDirectives,
+  PatchParserTask(Compiler compiler, ParserOptions parserOptions)
+      : this._enableConditionalDirectives =
+            parserOptions.enableConditionalDirectives,
+        this._enableGenericMethods = parserOptions.enableGenericMethods,
         super(compiler);
 
   /**
    * Scans a library patch file, applies the method patches and
    * injections to the library, and returns a list of class
    * patches.
    */
   Future patchLibrary(LibraryLoader loader,
                       Uri patchUri, LibraryElement originLibrary) {
     return compiler.readScript(originLibrary, patchUri)
@@ skipping 16 matching lines @@
     measure(() {
       // TODO(johnniwinther): Test that parts and exports are handled correctly.
       Script script = compilationUnit.script;
       Token tokens = new Scanner(script.file).tokenize();
       Function idGenerator = compiler.getNextFreeClassId;
       Listener patchListener = new PatchElementListener(compiler,
                                                         compilationUnit,
                                                         idGenerator);
       try {
         new PartialParser(patchListener,
-            enableConditionalDirectives: _enableConditionalDirectives)
+            enableConditionalDirectives: _enableConditionalDirectives,
+            enableGenericMethods: _enableGenericMethods)
             .parseUnit(tokens);
       } on ParserError catch (e) {
         // No need to recover from a parser error in platform libraries, user
         // will never see this if the libraries are tested correctly.
         reporter.internalError(
             compilationUnit, "Parser error in patch file: $e");
       }
     });
   }
 
   void parsePatchClassNode(PartialClassElement cls) {
     // Parse [PartialClassElement] using a "patch"-aware parser instead
     // of calling its [parseNode] method.
     if (cls.cachedNode != null) return;
 
     measure(() => reporter.withCurrentElement(cls, () {
       MemberListener listener = new PatchMemberListener(compiler, cls);
       Parser parser = new PatchClassElementParser(
-          listener, enableConditionalDirectives: _enableConditionalDirectives);
+          listener,
+          enableConditionalDirectives: _enableConditionalDirectives,
+          enableGenericMethods: _enableGenericMethods);
       try {
         Token token = parser.parseTopLevelDeclaration(cls.beginToken);
         assert(identical(token, cls.endToken.next));
       } on ParserError catch (e) {
         // No need to recover from a parser error in platform libraries, user
         // will never see this if the libraries are tested correctly.
         reporter.internalError(
             cls, "Parser error in patch file: $e");
       }
       cls.cachedNode = listener.popNode();
@@ skipping 31 matching lines @@
       enclosingClass.addMember(patch, reporter);
     }
   }
 }
 
 /**
  * Partial parser for patch files that also handles the members of class
  * declarations.
  */
 class PatchClassElementParser extends PartialParser {
-  PatchClassElementParser(Listener listener, {bool enableConditionalDirectives})
+  PatchClassElementParser(Listener listener,
+      {bool enableConditionalDirectives: false,
+       bool enableGenericMethods: false})
       : super(listener,
-          enableConditionalDirectives: enableConditionalDirectives);
+          enableConditionalDirectives: enableConditionalDirectives,
+          enableGenericMethods: enableGenericMethods);
 
   Token parseClassBody(Token token) => fullParseClassBody(token);
 }
 
 /**
  * Extension of [ElementListener] for parsing patch files.
  */
 class PatchElementListener extends ElementListener implements Listener {
   final Compiler compiler;
 
@@ skipping 410 matching lines @@
 
 class PatchVersion {
   final String tag;
 
   const PatchVersion(this.tag);
 
   bool isActive(String patchTag) => tag == null || tag == patchTag;
 
   String toString() => 'PatchVersion($tag)';
 }