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// 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
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#include <string>
#include <vector>
#include "string_piece.h"
namespace shaderc_util {
// Returns true if the given path is an absolute path.
bool IsAbsolutePath(const std::string& path);
// A helper function to return the base file name from either absolute path or
// relative path representation of a file. It keeps the component from the last
// '/' or '\' to the end of the given string. If the component is '..' or '.',
// returns an empty string. If '/' or '\' is the last char of the given string,
// also returns an empty string.
// e.g.: dir_a/dir_b/file_c.vert => file_c.vert
// dir_a/dir_b/.. => <empty string>
// dir_a/dir_b/. => <empty string>
// dir_a/dirb/c/ => <empty string>
// Note that this method doesn't check whether the given path is a valid one or
// not.
std::string GetBaseFileName(const std::string& file_path);
// Reads all of the characters in a given file into input_data. Outputs an
// error message to std::cerr if the file could not be read and returns false if
// there was an error. If the input_file is "-", then input is read from
// std::cin.
bool ReadFile(const std::string& input_file_name,
std::vector<char>* input_data);
// Returns and initializes the file_stream parameter if the output_filename
// refers to a file, or returns &std::cout if the output_filename is "-".
// Returns nullptr and emits an error message to err if the file could
// not be opened for writing. If the output refers to a file, and the open
// failed for writing, file_stream is left with its fail_bit set.
std::ostream* GetOutputStream(const string_piece& output_filename,
std::ofstream* file_stream, std::ostream* err);
// Writes output_data to a file, overwriting if it exists. If output_file_name
// is "-", writes to std::cout.
bool WriteFile(std::ostream* output_stream, const string_piece& output_data);
} // namespace shaderc_util