IDL: Generate union type containers

Source/bindings/templates/union.cpp

Index: Source/bindings/templates/union.cpp
diff --git a/Source/bindings/templates/union.cpp b/Source/bindings/templates/union.cpp
index d3523387f89a93d6f1a4de2575ba5b8a8293128b..7d9a501aa0a4bef1c0ef2e5a89dd99eca764f082 100644
--- a/Source/bindings/templates/union.cpp
+++ b/Source/bindings/templates/union.cpp
@@ -2,4 +2,131 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// FIXME: Implement
+// This file has been auto-generated by {{code_generator}}. DO NOT MODIFY!
+
+#include "config.h"
+#include "{{header_filename}}"
+
+{% for filename in cpp_includes %}
+#include "{{filename}}"
+{% endfor %}
+
+namespace blink {
+
+{% for container in containers %}
+{{container.cpp_class}}::{{container.cpp_class}}()
+    : m_type(SpecificTypeNone)
+{
+}
+
+{% for member in container.members %}
+{{member.rvalue_cpp_type}} {{container.cpp_class}}::getAs{{member.type_name}}()
+{
+    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());
+    m_{{member.cpp_name}} = value;
+    m_type = {{member.specific_type_enum}};
+}
+
+{% endfor %}
+void V8{{container.cpp_class}}::toImpl(v8::Isolate* isolate, v8::Handle<v8::Value> v8Value, {{container.cpp_class}}& impl, ExceptionState& exceptionState)
+{
+    {# FIXME: We don't follow the spec on handling null and undefined at this
+       moment. Should be fixed once we implement all necessary conversion steps
+       below. #}
+    if (v8Value.IsEmpty() || isUndefinedOrNull(v8Value))
+        return;
+
+    {# The numbers in the following comments refer to the steps described in
+       http://heycam.github.io/webidl/#es-union
+       FIXME: Implement all necessary steps #}
+    {# 3. Platform objects (interfaces) #}
+    {% for interface in container.interface_types %}
+    if (V8{{interface.type_name}}::hasInstance(v8Value, isolate)) {
+        {{interface.cpp_local_type}} cppValue = V8{{interface.type_name}}::toImpl(v8::Handle<v8::Object>::Cast(v8Value));
+        impl.set{{interface.type_name}}(cppValue);
+        return;
+    }
+
+    {% endfor %}
+    {% if container.dictionary_type %}
+    {# 12. Dictionaries #}
+    {# FIXME: This should be "object but not Date or RegExp". Add checks when
+       we implement conversions for Date and RegExp. #}
+    if (v8Value->IsObject()) {
+        {{container.dictionary_type.cpp_local_type}} cppValue = V8{{container.dictionary_type.type_name}}::toImpl(isolate, v8Value, exceptionState);
+        if (!exceptionState.hadException())
+            impl.set{{container.dictionary_type.type_name}}(cppValue);
+        return;
+    }
+
+    {% endif %}
+    {# FIXME: In some cases, we can omit boolean and numeric type checks because
+       we have fallback conversions. (step 17 and 18) #}
+    {% if container.boolean_type %}
+    {# 14. Boolean #}
+    if (v8Value->IsBoolean()) {
+        impl.setBoolean(v8Value->ToBoolean()->Value());
+        return;
+    }
+
+    {% endif %}
+    {% if container.numeric_type %}
+    {# 15. Number #}
+    if (v8Value->IsNumber()) {
+        {{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}};
+        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;
+    }
+
+    {# 18. Boolean (fallback) #}
+    {% elif container.boolean_type %}
+    {
+        impl.setBoolean(v8Value->ToBoolean()->Value());
+        return;
+    }
+
+    {% endif %}
+    {# 19. TypeError #}
+    exceptionState.throwTypeError("Not a valid union member.");
+}
+
+v8::Handle<v8::Value> toV8({{container.cpp_class}}& impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
+{
+    {# FIXME: We might want to return undefined in some cases #}
+    if (impl.isNull())
+        return v8::Null(isolate);
+
+    {% for member in container.members %}
+    if (impl.is{{member.type_name}}())
+        return {{member.cpp_value_to_v8_value}};
+
+    {% endfor %}
+    ASSERT_NOT_REACHED();
+    return v8::Handle<v8::Value>();
+}
+
+{% endfor %}
+} // namespace blink