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198 lines
5.9 KiB
198 lines
5.9 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// Utility functions for working with FlatBuffers.
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#ifndef LIBTEXTCLASSIFIER_UTILS_FLATBUFFERS_REFLECTION_H_
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#define LIBTEXTCLASSIFIER_UTILS_FLATBUFFERS_REFLECTION_H_
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#include "utils/flatbuffers/flatbuffers_generated.h"
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#include "utils/optional.h"
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#include "utils/strings/stringpiece.h"
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#include "utils/variant.h"
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#include "flatbuffers/reflection.h"
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#include "flatbuffers/reflection_generated.h"
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namespace libtextclassifier3 {
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template <typename T>
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struct flatbuffers_base_type {
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static const reflection::BaseType value;
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};
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template <typename T>
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inline const reflection::BaseType flatbuffers_base_type<T>::value =
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reflection::None;
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template <>
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inline const reflection::BaseType flatbuffers_base_type<bool>::value =
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reflection::Bool;
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template <>
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inline const reflection::BaseType flatbuffers_base_type<int8>::value =
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reflection::Byte;
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template <>
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inline const reflection::BaseType flatbuffers_base_type<uint8>::value =
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reflection::UByte;
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template <>
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inline const reflection::BaseType flatbuffers_base_type<int16>::value =
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reflection::Short;
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template <>
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inline const reflection::BaseType flatbuffers_base_type<uint16>::value =
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reflection::UShort;
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template <>
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inline const reflection::BaseType flatbuffers_base_type<int32>::value =
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reflection::Int;
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template <>
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inline const reflection::BaseType flatbuffers_base_type<uint32>::value =
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reflection::UInt;
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template <>
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inline const reflection::BaseType flatbuffers_base_type<int64>::value =
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reflection::Long;
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template <>
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inline const reflection::BaseType flatbuffers_base_type<uint64>::value =
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reflection::ULong;
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template <>
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inline const reflection::BaseType flatbuffers_base_type<float>::value =
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reflection::Float;
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template <>
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inline const reflection::BaseType flatbuffers_base_type<double>::value =
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reflection::Double;
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template <>
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inline const reflection::BaseType flatbuffers_base_type<StringPiece>::value =
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reflection::String;
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template <reflection::BaseType>
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struct flatbuffers_cpp_type;
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template <>
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struct flatbuffers_cpp_type<reflection::BaseType::Bool> {
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using value = bool;
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};
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template <>
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struct flatbuffers_cpp_type<reflection::BaseType::Byte> {
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using value = int8;
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};
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template <>
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struct flatbuffers_cpp_type<reflection::BaseType::UByte> {
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using value = uint8;
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};
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template <>
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struct flatbuffers_cpp_type<reflection::BaseType::Short> {
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using value = int16;
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};
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template <>
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struct flatbuffers_cpp_type<reflection::BaseType::UShort> {
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using value = uint16;
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};
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template <>
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struct flatbuffers_cpp_type<reflection::BaseType::Int> {
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using value = int32;
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};
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template <>
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struct flatbuffers_cpp_type<reflection::BaseType::UInt> {
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using value = uint32;
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};
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template <>
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struct flatbuffers_cpp_type<reflection::BaseType::Long> {
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using value = int64;
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};
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template <>
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struct flatbuffers_cpp_type<reflection::BaseType::ULong> {
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using value = uint64;
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};
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template <>
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struct flatbuffers_cpp_type<reflection::BaseType::Float> {
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using value = float;
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};
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template <>
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struct flatbuffers_cpp_type<reflection::BaseType::Double> {
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using value = double;
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};
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// Gets the field information for a field name, returns nullptr if the
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// field was not defined.
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const reflection::Field* GetFieldOrNull(const reflection::Object* type,
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const StringPiece field_name);
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// Gets the field information for a field offet, returns nullptr if no field was
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// defined with the given offset.
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const reflection::Field* GetFieldOrNull(const reflection::Object* type,
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const int field_offset);
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// Gets a field by name or offset, returns nullptr if no field was found.
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const reflection::Field* GetFieldOrNull(const reflection::Object* type,
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const StringPiece field_name,
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const int field_offset);
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// Gets a field by a field spec, either by name or offset. Returns nullptr if no
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// such field was found.
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const reflection::Field* GetFieldOrNull(const reflection::Object* type,
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const FlatbufferField* field);
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const reflection::Field* GetFieldOrNull(const reflection::Object* type,
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const FlatbufferFieldT* field);
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// Gets the type information for the given type name or nullptr if not
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// specified.
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const reflection::Object* TypeForName(const reflection::Schema* schema,
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const StringPiece type_name);
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// Gets the type id for a type name.
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Optional<int> TypeIdForName(const reflection::Schema* schema,
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const StringPiece type_name);
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// Gets the type id for a type.
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Optional<int> TypeIdForObject(const reflection::Schema* schema,
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const reflection::Object* type);
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// Resolves field lookups by name to the concrete field offsets.
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bool SwapFieldNamesForOffsetsInPath(const reflection::Schema* schema,
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FlatbufferFieldPathT* path);
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// Checks whether a type denotes an enum.
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inline bool IsEnum(const reflection::Type* type) {
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return flatbuffers::IsInteger(type->base_type()) && type->index() >= 0;
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}
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// Parses an enum value.
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Variant ParseEnumValue(const reflection::Schema* schema,
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const reflection::Type* type, StringPiece value);
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} // namespace libtextclassifier3
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#endif // LIBTEXTCLASSIFIER_UTILS_FLATBUFFERS_REFLECTION_H_
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