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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef AAPT_VALUE_TRANSFORMER_H
#define AAPT_VALUE_TRANSFORMER_H
#include <memory>
#include "StringPool.h"
namespace aapt {
class Value;
struct Item;
struct Reference;
struct Id;
struct RawString;
struct String;
struct StyledString;
struct FileReference;
struct BinaryPrimitive;
struct Attribute;
struct Style;
struct Array;
struct Plural;
struct Styleable;
struct Macro;
#define AAPT_TRANSFORM_VALUE(T) \
virtual std::unique_ptr<T> TransformDerived(const T* value) = 0; \
virtual std::unique_ptr<Value> TransformValue(const T* value);
#define AAPT_TRANSFORM_ITEM(T) \
virtual std::unique_ptr<Item> TransformItem(const T* value); \
AAPT_TRANSFORM_VALUE(T)
/**
* An interface for consuming a Value type and transforming it into another Value.
*
* The interface defines 2 methods for each type (T) that inherits from TransformableValue:
* std::unique_ptr<T> TransformDerived(const T*)
* std::unique_ptr<Value> TransformValue(const T*)
*
* The interface defines 3 method for each type (T) that inherits from TransformableItem:
* std::unique_ptr<T> TransformDerived(const T*)
* std::unique_ptr<Item> TransformItem(const T*)
* std::unique_ptr<Value> TransformValue(const T*)
*
* TransformDerived is invoked when Transform is invoked on the derived type T.
* TransformItem is invoked when Transform is invoked on an Item type.
* TransformValue is invoked when Transform is invoked on a Value type.
*
* ValueTransformerImpl transformer(&string_pool);
* T* derived = ...;
* std::unique_ptr<T> new_type = derived->Transform(transformer); // Invokes TransformDerived
*
* Item* item = derived;
* std::unique_ptr<Item> new_item = item->TransformItem(transformer); // Invokes TransformItem
*
* Value* value = item;
* std::unique_ptr<Value> new_value = value->TransformValue(transformer); // Invokes TransformValue
*
* For types that inherit from AbstractTransformableItem, the default implementation of
* TransformValue invokes TransformItem which invokes TransformDerived.
*
* For types that inherit from AbstractTransformableValue, the default implementation of
* TransformValue invokes TransformDerived.
*/
struct ValueTransformer {
// `new_pool` is the new StringPool that newly created Values should use for string storing string
// values.
explicit ValueTransformer(StringPool* new_pool);
virtual ~ValueTransformer() = default;
AAPT_TRANSFORM_ITEM(Id);
AAPT_TRANSFORM_ITEM(Reference);
AAPT_TRANSFORM_ITEM(RawString);
AAPT_TRANSFORM_ITEM(String);
AAPT_TRANSFORM_ITEM(StyledString);
AAPT_TRANSFORM_ITEM(FileReference);
AAPT_TRANSFORM_ITEM(BinaryPrimitive);
AAPT_TRANSFORM_VALUE(Attribute);
AAPT_TRANSFORM_VALUE(Style);
AAPT_TRANSFORM_VALUE(Array);
AAPT_TRANSFORM_VALUE(Plural);
AAPT_TRANSFORM_VALUE(Styleable);
AAPT_TRANSFORM_VALUE(Macro);
protected:
StringPool* const pool_;
};
#undef AAPT_TRANSFORM_VALUE
#undef AAPT_TRANSFORM_ITEM
template <typename Derived, typename Base>
struct TransformableValue : public Base {
// Transform this Derived into another Derived using the transformer.
std::unique_ptr<Derived> Transform(ValueTransformer& transformer) const;
private:
Value* TransformValueImpl(ValueTransformer& transformer) const override;
};
template <typename Derived, typename Base>
struct TransformableItem : public TransformableValue<Derived, Base> {
private:
Item* TransformItemImpl(ValueTransformer& transformer) const override;
};
} // namespace aapt
// Implementation
#include "ValueTransformer_inline.h"
#endif // AAPT_VALUE_TRANSFORMER_H
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