IDL: Enumeration support in union types

Source/bindings/templates/union.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file has been auto-generated by {{code_generator}}. DO NOT MODIFY!
 
 #include "config.h"
 #include "{{header_filename}}"
 
 {% macro assign_and_return_if_hasinstance(member) %}
@@ skipping 18 matching lines @@
 {% for member in container.members %}
 {{member.rvalue_cpp_type}} {{container.cpp_class}}::getAs{{member.type_name}}() const
 {
     ASSERT(is{{member.type_name}}());
     return m_{{member.cpp_name}};
 }
 
 void {{container.cpp_class}}::set{{member.type_name}}({{member.rvalue_cpp_type}} value)
 {
     ASSERT(isNull());
+    {% if member.enum_validation_expression %}
+    String string = value;
+    if (!({{member.enum_validation_expression}})) {
+        ASSERT_NOT_REACHED();
+        return;
+    }
+    {% endif %}
     m_{{member.cpp_name}} = value;
     m_type = {{member.specific_type_enum}};
 }
 
 {% endfor %}
 {% if container.needs_trace %}
 void {{container.cpp_class}}::trace(Visitor* visitor)
 {
     {% for member in container.members if member.is_traceable %}
     visitor->trace(m_{{member.cpp_name}});
@@ skipping 68 matching lines @@
         {{container.numeric_type.v8_value_to_local_cpp_value}};
         impl.set{{container.numeric_type.type_name}}(cppValue);
         return;
     }
 
     {% endif %}
     {% if container.string_type %}
     {# 16. String #}
     {
         {{container.string_type.v8_value_to_local_cpp_value}};
+        {% if container.string_type.enum_validation_expression %}
+        String string = cppValue;
+        if (!({{container.string_type.enum_validation_expression}})) {
+            exceptionState.throwTypeError("'" + string + "' is not a valid enum value.");
+            return;
+        }
+        {% endif %}
         impl.set{{container.string_type.type_name}}(cppValue);
         return;
     }
 
     {# 17. Number (fallback) #}
     {% elif container.numeric_type %}
     {
         {{container.numeric_type.v8_value_to_local_cpp_value}};
         impl.set{{container.numeric_type.type_name}}(cppValue);
         return;
@@ skipping 30 matching lines @@
 
 {{container.cpp_class}} NativeValueTraits<{{container.cpp_class}}>::nativeValue(const v8::Local<v8::Value>& value, v8::Isolate* isolate, ExceptionState& exceptionState)
 {
     {{container.cpp_class}} impl;
     V8{{container.cpp_class}}::toImpl(isolate, value, impl, exceptionState);
     return impl;
 }
 
 {% endfor %}
 } // namespace blink