[Binding] Support primitive type for union member

Source/bindings/scripts/CodeGeneratorV8.pm

 # Copyright (C) 2005, 2006 Nikolas Zimmermann <zimmermann@kde.org>
 # Copyright (C) 2006 Anders Carlsson <andersca@mac.com>
 # Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
 # Copyright (C) 2006 Alexey Proskuryakov <ap@webkit.org>
 # Copyright (C) 2006 Apple Computer, Inc.
 # Copyright (C) 2007, 2008, 2009, 2012 Google Inc.
 # Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
 # Copyright (C) Research In Motion Limited 2010. All rights reserved.
 # Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
 # Copyright (C) 2012 Ericsson AB. All rights reserved.
@@ skipping 3012 matching lines @@
         for my $i (0 .. scalar(@$types)-1) {
             my $unionMemberType = $types->[$i];
             my $unionMemberVariable = $variableName . $i;
             my $isNull = GenerateIsNullExpression($unionMemberType, $unionMemberVariable);
             push @expression, $isNull;
         }
         return join " && ", @expression;
     }
     if (IsRefPtrType($type)) {
         return "!${variableName}";
+    } elsif ($type eq "DOMString") {
+        return "${variableName}.isNull()";
     } else {
-        return "${variableName}.isNull()";
+        return "";
     }
 }
 
 sub GenerateImplementationIndexedProperty
 {
     my $interface = shift;
     my $interfaceName = $interface->name;
     my $implClassName = GetImplName($interface);
     my $v8ClassName = GetV8ClassName($interface);
 
@@ skipping 145 matching lines @@
         push @arguments, "ec";
     }
 
     if (IsUnionType($returnType)) {
         my $code = "";
         my @extraArguments = ();
         for my $i (0..scalar(@{$returnType->unionMemberTypes})-1) {
             my $unionMemberType = $returnType->unionMemberTypes->[$i];
             my $nativeType = GetNativeType($unionMemberType);
             my $unionMemberVariable = $returnName . $i;
+            my $unionMemberEnabledVariable = $returnName . $i . "Enabled";
+            $code .= "    bool ${unionMemberEnabledVariable} = false;\n";
             $code .= "    ${nativeType} ${unionMemberVariable};\n";
+            push @extraArguments, $unionMemberEnabledVariable;
             push @extraArguments, $unionMemberVariable;
         }
         push @arguments, @extraArguments;
         $code .= "    ${functionExpression}(" . (join ", ", @arguments) . ");";
         return $code;
     } else {
         my $nativeType = GetNativeType($returnType);
         return "    ${nativeType} element = ${functionExpression}(" . (join ", ", @arguments) . ");"
     }
 }
@@ skipping 1503 matching lines @@
     my $returnHandleTypeArg = $returnHandleType ? ", $returnHandleType" : "";
     my $forMainWorldSuffix = shift || "";
 
     if (IsUnionType($type)) {
         my $types = $type->unionMemberTypes;
         my @codes = ();
         for my $i (0 .. scalar(@$types)-1) {
             my $unionMemberType = $types->[$i];
             my $unionMemberNumber = $i + 1;
             my $unionMemberVariable = $nativeValue . $i;
+            my $unionMemberEnabledVariable = $nativeValue . $i . "Enabled";
             my $unionMemberNativeValue = $unionMemberVariable;
             $unionMemberNativeValue .= ".release()" if (IsRefPtrType($unionMemberType));
             my $returnJSValueCode = NativeToJSValue($unionMemberType, $extendedAttributes, $unionMemberNativeValue, $indent . "    ", $receiver, $getCreationContext, $getIsolate, $getHolderContainer, $getScriptWrappable, $returnHandleType, $forMainWorldSuffix);
-            my $isNotNull = "!" . GenerateIsNullExpression($unionMemberType, $unionMemberVariable);
+            my $isNotNull = GenerateIsNullExpression($unionMemberType, $unionMemberVariable);
+            $isNotNull = " && !" . $isNotNull if $isNotNull;
             my $code = "";
-            $code .= "${indent}if (${isNotNull})\n";
+            $code .= "${indent}if (${unionMemberEnabledVariable}${isNotNull})\n";
             $code .= "${returnJSValueCode}";
             push @codes, $code;
         }
         return join "\n", @codes;
     }
 
     return "$indent$receiver v8Boolean($nativeValue, $getIsolate);" if $type eq "boolean";
     return "$indent$receiver v8Undefined();" if $type eq "void";     # equivalent to v8Undefined()
 
     # HTML5 says that unsigned reflected attributes should be in the range
@@ skipping 641 matching lines @@
         if ($currentInterface->extendedAttributes->{$extendedAttribute}) {
             $found = 1;
         }
         return 1 if $found;
     }, 0);
 
     return $found;
 }
 
 1;