new handleInvalidTopLevelDeclaration event in fasta parser

pkg/analyzer/lib/src/fasta/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' show Token, TokenType;
@@ skipping 1106 matching lines @@
         name,
         ast.functionExpression(typeParameters, parameters, body)));
   }
 
   @override
   void endTopLevelDeclaration(Token token) {
     debugEvent("TopLevelDeclaration");
   }
 
   @override
+  void handleInvalidTopLevelDeclaration(Token endToken) {
+    debugEvent("InvalidTopLevelDeclaration");
+    pop(); // metadata star
+    // TODO(danrubel): consider creating a AST node
+    // representing the invalid declaration to better support code completion,
+    // quick fixes, etc, rather than discarding the metadata and token
+    push(NullValue.InvalidTopLevelDeclaration);
+  }
+
+  @override
   void beginCompilationUnit(Token token) {
     push(token);
   }
 
   @override
   void endCompilationUnit(int count, Token endToken) {
     debugEvent("CompilationUnit");
     List<Object> elements = popList(count);
     Token beginToken = pop();
 
     ScriptTag scriptTag = null;
     var directives = <Directive>[];
     var declarations = <CompilationUnitMember>[];
     if (elements != null) {
       for (AstNode node in elements) {
         if (node is ScriptTag) {
           scriptTag = node;
         } else if (node is Directive) {
           directives.add(node);
         } else if (node is CompilationUnitMember) {
           declarations.add(node);
+        } else if (node == NullValue.InvalidTopLevelDeclaration) {
+          // TODO(danrubel): consider creating a AST node
+          // representing the invalid declaration to better support code completion,

[ahe, 2017/08/16 13:22:45]

Long line! P0!!! ;-)

[danrubel, 2017/08/16 13:34:29]

Fixed. :-)

+          // quick fixes, etc, rather than discarding the metadata and token
         } else {
           unhandled(
               "${node.runtimeType}", "compilation unit", node?.offset, uri);
         }
       }
     }
 
     push(ast.compilationUnit(
         beginToken, scriptTag, directives, declarations, endToken));
   }
@@ skipping 852 matching lines @@
       } else if (identical('var', s)) {
         finalConstOrVarKeyword = token;
       } else if (identical('covariant', s)) {
         covariantKeyword = token;
       } else {
         unhandled("$s", "modifier", token.charOffset, null);
       }
     }
   }
 }