src/tint/lang/wgsl/writer/ast_printer/helper_test.h

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#ifndef SRC_TINT_LANG_WGSL_WRITER_AST_PRINTER_HELPER_TEST_H_
#define SRC_TINT_LANG_WGSL_WRITER_AST_PRINTER_HELPER_TEST_H_

#include <memory>
#include <utility>

#include "gtest/gtest.h"
#include "src/tint/lang/wgsl/program/program_builder.h"
#include "src/tint/lang/wgsl/resolver/resolve.h"
#include "src/tint/lang/wgsl/writer/ast_printer/ast_printer.h"

namespace tint::wgsl::writer {

/// Helper class for testing
template <typename BASE>
class TestHelperBase : public BASE, public ProgramBuilder {
  public:
    TestHelperBase() = default;

    ~TestHelperBase() override = default;

    /// Builds and returns a ASTPrinter from the program.
    /// @param resolve if true, the program will be resolved before returning
    /// @note The generator is only built once. Multiple calls to Build() will
    /// return the same ASTPrinter without rebuilding.
    /// @return the built generator
    ASTPrinter& Build(bool resolve = true) {
        if (gen_) {
            return *gen_;
        }
        if (resolve) {
            program = std::make_unique<Program>(resolver::Resolve(*this));
        } else {
            program = std::make_unique<Program>(std::move(*this));
        }
        if (!program->IsValid()) {
            ADD_FAILURE() << program->Diagnostics();
        }
        gen_ = std::make_unique<ASTPrinter>(*program);
        return *gen_;
    }

    /// The program built with a call to Build()
    std::unique_ptr<Program> program;

  private:
    std::unique_ptr<ASTPrinter> gen_;
};
using TestHelper = TestHelperBase<testing::Test>;

template <typename T>
using TestParamHelper = TestHelperBase<testing::TestWithParam<T>>;

}  // namespace tint::wgsl::writer

#endif  // SRC_TINT_LANG_WGSL_WRITER_AST_PRINTER_HELPER_TEST_H_