// Copyright 2015 The Shaderc Authors. All rights reserved.

//

// 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 GLSLC_FILE_H_

#define GLSLC_FILE_H_

#include "libshaderc_util/string_piece.h"

namespace glslc {

// Given a file name, returns its extension. If no extension exists,

// returns an empty string_piece.

shaderc_util::string_piece GetFileExtension(

    const shaderc_util::string_piece& filename);

// Returns true if the given file name ends with a known shader file extension.

inline bool IsStageFile(const shaderc_util::string_piece& filename) {

  const shaderc_util::string_piece extension =

      glslc::GetFileExtension(filename);

  return extension == "vert" || extension == "frag" || extension == "tesc" ||

         extension == "tese" || extension == "geom" || extension == "comp";

}

// Returns the file extension if is either "glsl" or "hlsl", or an empty

// string otherwise.

inline std::string GetGlslOrHlslExtension(

    const shaderc_util::string_piece& filename) {

  auto extension = glslc::GetFileExtension(filename);

  if ((extension == "glsl") || (extension == "hlsl")) return extension.str();

  return "";

}

}  // namespace glslc

#endif  // GLSLC_FILE_H_