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// Copyright 2021 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_TEST_HELPER_H_
#define SRC_TINT_TRANSFORM_TEST_HELPER_H_
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "gtest/gtest.h"
#include "src/tint/reader/wgsl/parser.h"
#include "src/tint/transform/manager.h"
#include "src/tint/writer/wgsl/generator.h"
namespace tint::transform {
/// @param program the program to get an output WGSL string from
/// @returns the output program as a WGSL string, or an error string if the
/// program is not valid.
inline std::string str(const Program& program) {
diag::Formatter::Style style;
style.print_newline_at_end = false;
if (!program.IsValid()) {
return diag::Formatter(style).format(program.Diagnostics());
}
writer::wgsl::Options options;
auto result = writer::wgsl::Generate(&program, options);
if (!result.success) {
return "WGSL writer failed:\n" + result.error;
}
auto res = result.wgsl;
if (res.empty()) {
return res;
}
// The WGSL sometimes has two trailing newlines. Strip them
while (res.back() == '\n') {
res.pop_back();
}
if (res.empty()) {
return res;
}
return "\n" + res + "\n";
}
/// Helper class for testing transforms
template <typename BASE>
class TransformTestBase : public BASE {
public:
/// Transforms and returns the WGSL source `in`, transformed using
/// `transform`.
/// @param transform the transform to apply
/// @param in the input WGSL source
/// @param data the optional DataMap to pass to Transform::Run()
/// @return the transformed output
Output Run(std::string in,
std::unique_ptr<transform::Transform> transform,
const DataMap& data = {}) {
std::vector<std::unique_ptr<transform::Transform>> transforms;
transforms.emplace_back(std::move(transform));
return Run(std::move(in), std::move(transforms), data);
}
/// Transforms and returns the WGSL source `in`, transformed using
/// a transform of type `TRANSFORM`.
/// @param in the input WGSL source
/// @param data the optional DataMap to pass to Transform::Run()
/// @return the transformed output
template <typename... TRANSFORMS>
Output Run(std::string in, const DataMap& data = {}) {
auto file = std::make_unique<Source::File>("test", in);
auto program = reader::wgsl::Parse(file.get());
// Keep this pointer alive after Transform() returns
files_.emplace_back(std::move(file));
return Run<TRANSFORMS...>(std::move(program), data);
}
/// Transforms and returns program `program`, transformed using a transform of
/// type `TRANSFORM`.
/// @param program the input Program
/// @param data the optional DataMap to pass to Transform::Run()
/// @return the transformed output
template <typename... TRANSFORMS>
Output Run(Program&& program, const DataMap& data = {}) {
if (!program.IsValid()) {
return Output(std::move(program));
}
Manager manager;
for (auto* transform_ptr : std::initializer_list<Transform*>{new TRANSFORMS()...}) {
manager.append(std::unique_ptr<Transform>(transform_ptr));
}
return manager.Run(&program, data);
}
/// @param program the input program
/// @param data the optional DataMap to pass to Transform::Run()
/// @return true if the transform should be run for the given input.
template <typename TRANSFORM>
bool ShouldRun(Program&& program, const DataMap& data = {}) {
if (!program.IsValid()) {
ADD_FAILURE() << "ShouldRun() called with invalid program: "
<< program.Diagnostics().str();
return false;
}
const Transform& t = TRANSFORM();
DataMap outputs;
auto result = t.Apply(&program, data, outputs);
if (!result) {
return false;
}
if (!result->IsValid()) {
ADD_FAILURE() << "Apply() called by ShouldRun() returned errors: "
<< result->Diagnostics().str();
return true;
}
return result.has_value();
}
/// @param in the input WGSL source
/// @param data the optional DataMap to pass to Transform::Run()
/// @return true if the transform should be run for the given input.
template <typename TRANSFORM>
bool ShouldRun(std::string in, const DataMap& data = {}) {
auto file = std::make_unique<Source::File>("test", in);
auto program = reader::wgsl::Parse(file.get());
return ShouldRun<TRANSFORM>(std::move(program), data);
}
/// @param output the output of the transform
/// @returns the output program as a WGSL string, or an error string if the
/// program is not valid.
std::string str(const Output& output) { return transform::str(output.program); }
private:
std::vector<std::unique_ptr<Source::File>> files_;
};
using TransformTest = TransformTestBase<testing::Test>;
template <typename T>
using TransformTestWithParam = TransformTestBase<testing::TestWithParam<T>>;
} // namespace tint::transform
#endif // SRC_TINT_TRANSFORM_TEST_HELPER_H_