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// Copyright 2022 The Tint Authors.
//
// 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 SRC_TINT_TRANSFORM_EXPAND_COMPOUND_ASSIGNMENT_H_
#define SRC_TINT_TRANSFORM_EXPAND_COMPOUND_ASSIGNMENT_H_
#include "src/tint/transform/transform.h"
namespace tint::transform {
/// Converts compound assignment statements to regular assignment statements,
/// hoisting the LHS expression if necessary.
///
/// Before:
/// ```
/// a += 1;
/// vector_array[foo()][bar()] *= 2.0;
/// ```
///
/// After:
/// ```
/// a = a + 1;
/// let _vec = &vector_array[foo()];
/// let _idx = bar();
/// (*_vec)[_idx] = (*_vec)[_idx] * 2.0;
/// ```
///
/// This transform also handles increment and decrement statements in the same
/// manner, by replacing `i++` with `i = i + 1`.
class ExpandCompoundAssignment final : public Castable<ExpandCompoundAssignment, Transform> {
public:
/// Constructor
ExpandCompoundAssignment();
/// Destructor
~ExpandCompoundAssignment() override;
/// @param program the program to inspect
/// @param data optional extra transform-specific input data
/// @returns true if this transform should be run for the given program
bool ShouldRun(const Program* program, const DataMap& data = {}) const override;
protected:
/// Runs the transform using the CloneContext built for transforming a
/// program. Run() is responsible for calling Clone() on the CloneContext.
/// @param ctx the CloneContext primed with the input program and
/// ProgramBuilder
/// @param inputs optional extra transform-specific input data
/// @param outputs optional extra transform-specific output data
void Run(CloneContext& ctx, const DataMap& inputs, DataMap& outputs) const override;
};
} // namespace tint::transform
#endif // SRC_TINT_TRANSFORM_EXPAND_COMPOUND_ASSIGNMENT_H_