Add a new bindings2/scripts directory for Dart bindings

sky/engine/bindings2/scripts/templates/interface_cpp.template

+{% extends 'interface_base_cpp.template' %}
+
+
+{# TODO(terry): Implement setter and deleter too #}
+
+
+{##############################################################################}
+{% block indexed_property_getter %}
+{% if indexed_property_getter and not indexed_property_getter.is_custom %}
+  {% set getter = indexed_property_getter %}
+static void indexedPropertyGetter(Dart_NativeArguments args)
+{
+    {{cpp_class}}* /* FIXME(vsm): Remove this. */ ALLOW_UNUSED receiver = GetReceiver<{{cpp_class}}>(args);
+    Dart_Handle exception = nullptr;
+    {
+  {% if indexed_property_getter.is_raises_exception %}
+        ExceptionState es;
+  {% endif %}
+
+        {# TODO(terry): Assume index is unsigned long, which all currently are. #}
+        unsigned index = DartConverter<unsigned>::FromArguments(args, 1, exception);
+        if (exception)
+            goto fail;
+        {{indexed_property_getter.cpp_type}} result = {{indexed_property_getter.cpp_value}};
+        if (!result)
+            return;
+        {{indexed_property_getter.dart_set_return_value}};
+
+        return;
+    }
+
+fail:
+    Dart_ThrowException(exception);
+    ASSERT_NOT_REACHED();
+}
+
+{% endif %}
+{# TODO(terry): Should handle custom index getter - none today. #}
+{% endblock %}
+
+
+{##############################################################################}
+{% block indexed_property_getter_resolver %}
+    {# TODO(terry): Support all indexed and named properties today only indexed getter is supported. #}
+    {# Resolver indexed properties #}
+    {% if indexed_property_getter and not indexed_property_getter.is_custom %}
+      {% for native_entry in indexed_property_getter.native_entries %}
+        {% set resolver_string = native_entry.resolver_string %}
+if (argumentCount == 2 && name == "{{resolver_string}}") {
+    *autoSetupScope = true;
+    return {{dart_class}}Internal::indexedPropertyGetter;
+}
+      {% endfor %}
+    {% endif %}
+{% endblock %}
+
+{##############################################################################}
+{% block named_property_getter_resolver %}
+    {# Resolver named properties #}
+    {% if named_property_getter %}
+      {% for native_entry in named_property_getter.native_entries %}
+        {% set resolver_string = native_entry.resolver_string %}
+if (argumentCount == 2 && (name == "{{resolver_string}}")) {
+    *autoSetupScope = true;
+    return {{dart_class}}Internal::propertyQuery;
+}
+      {% endfor %}
+    {% endif %}
+{% endblock %}
+
+{##############################################################################}
+{% block generate_symbolizer_indexed_property_getter %}
+    {% if indexed_property_getter and not indexed_property_getter.is_custom %}
+      {% for native_entry in indexed_property_getter.native_entries %}
+        {% set resolver_string = native_entry.resolver_string %}
+if (native_function == {{dart_class}}Internal::indexedPropertyGetter) {
+    return reinterpret_cast<const uint8_t*>("{{resolver_string}}");
+}
+      {% endfor %}
+    {% endif %}
+{% endblock %}
+
+{##############################################################################}
+{% block generate_symbolizer_named_property_getter %}
+    {# Resolver named properties #}
+    {% if named_property_getter %}
+      {% for native_entry in named_property_getter.native_entries %}
+        {% set resolver_string = native_entry.resolver_string %}
+if (native_function == {{dart_class}}Internal::propertyQuery) {
+    return reinterpret_cast<const uint8_t*>("{{resolver_string}}");
+}
+      {% endfor %}
+    {% endif %}
+{% endblock %}
+
+{##############################################################################}
+
+{% from 'methods_cpp.template' import static_method_name with context %}
+
+{##############################################################################}
+{% block overloaded_constructor %}
+{% if constructor_overloads %}
+static void constructorCallbackDispatcher(Dart_NativeArguments args)
+{
+    Dart_Handle exception = nullptr;
+    const int argOffset = 0;
+    int argCount = Dart_GetNativeArgumentCount(args) + argOffset;
+    {# 2. Initialize argcount to be min(maxarg, n). #}
+    switch (std::min({{constructor_overloads.maxarg}}, argCount)) {
+    {# 3. Remove from S all entries whose type list is not of length argcount. #}
+    {% for length, tests_constructors in constructor_overloads.length_tests_methods %}
+    case {{length}}:
+        {# Then resolve by testing argument #}
+        {% for test, constructor in tests_constructors %}
+        {# 10. If i = d, then: #}
+        if ({{test}}) {
+          {% if constructor.is_custom %}
+            {{static_method_name(constructor.name)}}(args);
+          {% else %}
+            {{static_method_name(constructor.name, constructor.overload_index)}}(args);
+          {% endif %}
+            return;
+        }
+        {% endfor %}
+        break;
+    {% endfor %}
+    default:
+        {# Invalid arity, throw error #}
+        {# Report full list of valid arities if gaps and above minimum #}
+        {% if constructor_overloads.valid_arities %}
+        if (argCount >= {{overloads.minarg}}) {
+            const String message = "Wrong arity, expected one of {{constructor_overloads.valid_arities}}";
+            // TODO(dart): exception = DartUtilities::coreArgumentErrorException(message);
+            goto fail;
+        }
+        {% endif %}
+        {# Otherwise just report "not enough arguments" #}
+        {
+            const String message = "Not enough arguments (at least {{constructor_overloads.minarg}} required)";
+            // TODO(dart): exception = DartUtilities::coreArgumentErrorException(message);
+            goto fail;
+        }
+        return;
+    }
+    {# No match, throw error #}
+    {
+        const String message = "No matching constructor signature.";
+        // TODO(dart): exception = DartUtilities::coreArgumentErrorException(message);
+        goto fail;
+    }
+    return;
+fail:
+    Dart_ThrowException(exception);
+    ASSERT_NOT_REACHED();
+}
+{% endif %}
+{% endblock %}
+
+
+{##############################################################################}