src/tint/lang/glsl/writer/printer/helper_test.h

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#ifndef SRC_TINT_LANG_GLSL_WRITER_PRINTER_HELPER_TEST_H_
#define SRC_TINT_LANG_GLSL_WRITER_PRINTER_HELPER_TEST_H_

#include <string>

#include "gtest/gtest.h"
#include "src/tint/lang/core/ir/builder.h"
#include "src/tint/lang/core/ir/validator.h"
#include "src/tint/lang/glsl/writer/common/version.h"
#include "src/tint/lang/glsl/writer/printer/printer.h"
#include "src/tint/lang/glsl/writer/raise/raise.h"

namespace tint::glsl::writer {

/// Base helper class for testing the GLSL generator implementation.
template <typename BASE>
class GlslPrinterTestHelperBase : public BASE {
  public:
    /// The test module.
    core::ir::Module mod;
    /// The test builder.
    core::ir::Builder b{mod};
    /// The type manager.
    core::type::Manager& ty{mod.Types()};
    /// The GLSL version
    Version version{};

  protected:
    /// Validation errors
    std::string err_;

    /// Generated GLSL
    std::string output_;

    /// Run the writer on the IR module and validate the result.
    /// @returns true if generation and validation succeeded
    bool Generate() {
        if (auto raised = Raise(mod); raised != Success) {
            err_ = raised.Failure().reason.Str();
            return false;
        }

        auto result = Print(mod, version);
        if (result != Success) {
            err_ = result.Failure().reason.Str();
            return false;
        }
        output_ = result.Get();

        return true;
    }

    /// @returns the metal header string
    std::string GlslHeader() const {
        std::stringstream ver;
        ver << "#version " << version.major_version << version.minor_version << "0";
        if (version.IsES()) {
            ver << " es";
        }
        ver << "\n";
        return ver.str();
    }
};

using GlslPrinterTest = GlslPrinterTestHelperBase<testing::Test>;

template <typename T>
using GlslPrinterTestWithParam = GlslPrinterTestHelperBase<testing::TestWithParam<T>>;

}  // namespace tint::glsl::writer

#endif  // SRC_TINT_LANG_GLSL_WRITER_PRINTER_HELPER_TEST_H_