Update handleType event to take questionMark token

... which in this CL will always null.
This is the first step when adding NNDB support as outlined in
dart-lang/language#110

Change-Id: If3810bcaf1b73e70924f09d619e2a84e7d5ba8d6
Reviewed-on: https://dart-review.googlesource.com/c/86860
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Dan Rubel <danrubel@google.com>

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

@@ -960,8 +960,9 @@ class AstBuilder extends StackListener {
   }
 
   @override
-  void handleType(Token beginToken) {
+  void handleType(Token beginToken, Token questionMark) {
     debugEvent("Type");
+    reportErrorIfNullableType(questionMark);
 
     TypeArgumentList arguments = pop();
     Identifier name = pop();
@@ -2552,7 +2553,7 @@ class AstBuilder extends StackListener {
     // keyword up to an element?
     handleIdentifier(voidKeyword, IdentifierContext.typeReference);
     handleNoTypeArguments(voidKeyword);
-    handleType(voidKeyword);
+    handleType(voidKeyword, null);
   }
 
   @override

pkg/analyzer/tool/summary/mini_ast.dart

@@ -478,8 +478,9 @@ class MiniAstBuilder extends StackListener {
   }
 
   @override
-  void handleType(Token beginToken) {
+  void handleType(Token beginToken, Token questionMark) {
     debugEvent("Type");
+    reportErrorIfNullableType(questionMark);
     List<TypeName> typeArguments = popTypedList();
     String name = pop();
     push(new TypeName(name, typeArguments));

pkg/front_end/lib/src/fasta/kernel/body_builder.dart

@@ -2467,9 +2467,10 @@ abstract class BodyBuilder extends ScopeListener<JumpTarget>
   }
 
   @override
-  void handleType(Token beginToken) {
+  void handleType(Token beginToken, Token questionMark) {
     // TODO(ahe): The scope is wrong for return types of generic functions.
     debugEvent("Type");
+    reportErrorIfNullableType(questionMark);
     List<UnresolvedType<KernelTypeBuilder>> arguments = pop();
     Object name = pop();
     if (name is QualifiedName) {

pkg/front_end/lib/src/fasta/parser/forwarding_listener.dart

@@ -1349,8 +1349,8 @@ class ForwardingListener implements Listener {
   }
 
   @override
-  void handleType(Token beginToken) {
-    listener?.handleType(beginToken);
+  void handleType(Token beginToken, Token questionMark) {
+    listener?.handleType(beginToken, questionMark);
   }
 
   @override
@@ -1398,6 +1398,11 @@ class ForwardingListener implements Listener {
     listener?.logEvent(name);
   }
 
+  @override
+  void reportErrorIfNullableType(Token questionMark) {
+    listener?.reportErrorIfNullableType(questionMark);
+  }
+
   @override
   set suppressParseErrors(bool value) {
     listener?.suppressParseErrors = value;

pkg/front_end/lib/src/fasta/parser/listener.dart

@@ -6,7 +6,7 @@ library fasta.parser.listener;
 
 import '../../scanner/token.dart' show Token;
 
-import '../fasta_codes.dart' show Message;
+import '../fasta_codes.dart' show Message, templateUnexpectedToken;
 
 import '../quote.dart' show UnescapeErrorListener;
 
@@ -18,6 +18,8 @@ import 'identifier_context.dart' show IdentifierContext;
 
 import 'member_kind.dart' show MemberKind;
 
+import 'util.dart' show optional;
+
 /// A parser event listener that does nothing except throw exceptions
 /// on parser errors.
 ///
@@ -933,10 +935,22 @@ class Listener implements UnescapeErrorListener {
     logEvent("TryStatement");
   }
 
-  void handleType(Token beginToken) {
+  void handleType(Token beginToken, Token questionMark) {
     logEvent("Type");
   }
 
+  // TODO(danrubel): Remove this once all listeners have been updated
+  // to properly handle nullable types
+  void reportErrorIfNullableType(Token questionMark) {
+    if (questionMark != null) {
+      assert(optional('?', questionMark));
+      handleRecoverableError(
+          templateUnexpectedToken.withArguments(questionMark),
+          questionMark,
+          questionMark);
+    }
+  }
+
   void handleNoName(Token token) {
     logEvent("NoName");
   }

pkg/front_end/lib/src/fasta/parser/type_info_impl.dart

@@ -148,7 +148,7 @@ class PrefixedType implements TypeInfo {
     listener.handleQualified(period);
 
     listener.handleNoTypeArguments(token.next);
-    listener.handleType(start);
+    listener.handleType(start, null);
     return token;
   }
 
@@ -183,10 +183,13 @@ class SimpleTypeWith1Argument implements TypeInfo {
   Token parseType(Token token, Parser parser) {
     Token start = token = token.next;
     assert(token.isKeywordOrIdentifier);
-    Listener listener = parser.listener;
-    listener.handleIdentifier(token, IdentifierContext.typeReference);
+    parser.listener.handleIdentifier(token, IdentifierContext.typeReference);
     token = typeArg.parseArguments(token, parser);
-    listener.handleType(start);
+    return parseTypeRest(start, token, parser);
+  }
+
+  Token parseTypeRest(Token start, Token token, Parser parser) {
+    parser.listener.handleType(start, null);
     return token;
   }
 
@@ -221,10 +224,13 @@ class SimpleType implements TypeInfo {
   Token parseType(Token token, Parser parser) {
     token = token.next;
     assert(isValidTypeReference(token));
-    Listener listener = parser.listener;
-    listener.handleIdentifier(token, IdentifierContext.typeReference);
+    parser.listener.handleIdentifier(token, IdentifierContext.typeReference);
     token = noTypeParamOrArg.parseArguments(token, parser);
-    listener.handleType(token);
+    return parseTypeRest(token, parser);
+  }
+
+  Token parseTypeRest(Token token, Parser parser) {
+    parser.listener.handleType(token, null);
     return token;
   }
 
@@ -372,7 +378,7 @@ class ComplexTypeInfo implements TypeInfo {
           }
         }
         token = typeArguments.parseArguments(token, parser);
-        parser.listener.handleType(typeRefOrPrefix);
+        parser.listener.handleType(typeRefOrPrefix, null);
       }
     }
 

pkg/front_end/lib/src/fasta/source/diet_listener.dart

@@ -148,7 +148,7 @@ class DietListener extends StackListener {
   }
 
   @override
-  void handleType(Token beginToken) {
+  void handleType(Token beginToken, Token questionMark) {
     debugEvent("Type");
     discard(1);
   }

pkg/front_end/lib/src/fasta/source/outline_builder.dart

@@ -961,8 +961,9 @@ class OutlineBuilder extends StackListener {
   }
 
   @override
-  void handleType(Token beginToken) {
+  void handleType(Token beginToken, Token questionMark) {
     debugEvent("Type");
+    reportErrorIfNullableType(questionMark);
     List<TypeBuilder> arguments = pop();
     int charOffset = pop();
     Object name = pop();

pkg/front_end/lib/src/fasta/source/type_promotion_look_ahead_listener.dart

@@ -1212,7 +1212,7 @@ class TypePromotionLookAheadListener extends Listener {
   }
 
   @override
-  void handleType(Token beginToken) {
+  void handleType(Token beginToken, Token questionMark) {
     debugEvent("Type", beginToken);
     state.pop();
   }