Differential D4501 Diff 14126 extern/gltf-draco/draco/src/draco/core/options.h

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extern/gltf-draco/draco/src/draco/core/options.h

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				// Copyright 2016 The Draco 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 DRACO_CORE_OPTIONS_H_
				#define DRACO_CORE_OPTIONS_H_

				#include <cstdlib>
				#include <map>
				#include <string>

				namespace draco {

				// Class for storing generic options as a <name, value> pair in a string map.
				// The API provides helper methods for directly storing values of various types
				// such as ints and bools. One named option should be set with only a single
				// data type.
				class Options {
				public:
				Options();
				void SetInt(const std::string &name, int val);
				void SetFloat(const std::string &name, float val);
				void SetBool(const std::string &name, bool val);
				void SetString(const std::string &name, const std::string &val);
				template <class VectorT>
				void SetVector(const std::string &name, const VectorT &vec) {
				SetVector(name, &vec[0], VectorT::dimension);
				}
				template <typename DataTypeT>
				void SetVector(const std::string &name, const DataTypeT *vec, int num_dims);

				// Getters will return a default value if the entry is not found. The default
				// value can be specified in the overloaded version of each function.
				int GetInt(const std::string &name) const;
				int GetInt(const std::string &name, int default_val) const;
				float GetFloat(const std::string &name) const;
				float GetFloat(const std::string &name, float default_val) const;
				bool GetBool(const std::string &name) const;
				bool GetBool(const std::string &name, bool default_val) const;
				std::string GetString(const std::string &name) const;
				std::string GetString(const std::string &name,
				const std::string &default_val) const;
				template <class VectorT>
				VectorT GetVector(const std::string &name, const VectorT &default_val) const;
				// Unlike other Get functions, this function returns false if the option does
				// not exist, otherwise it fills \|out_val\| with the vector values. If a
				// default value is needed, it can be set in \|out_val\|.
				template <typename DataTypeT>
				bool GetVector(const std::string &name, int num_dims,
				DataTypeT *out_val) const;

				bool IsOptionSet(const std::string &name) const {
				return options_.count(name) > 0;
				}

				private:
				// All entries are internally stored as strings and converted to the desired
				// return type based on the used Get* method.
				// TODO(ostava): Consider adding type safety mechanism that would prevent
				// unsafe operations such as a conversion from vector to int.
				std::map<std::string, std::string> options_;
				};

				template <typename DataTypeT>
				void Options::SetVector(const std::string &name, const DataTypeT *vec,
				int num_dims) {
				std::string out;
				for (int i = 0; i < num_dims; ++i) {
				if (i > 0)
				out += " ";

				// GNU STL on android doesn't include a proper std::to_string, but the libc++
				// version does
				#if defined(ANDROID) && !defined(_LIBCPP_VERSION)
				out += to_string(vec[i]);
				#else
				out += std::to_string(vec[i]);
				#endif
				}
				options_[name] = out;
				}

				template <class VectorT>
				VectorT Options::GetVector(const std::string &name,
				const VectorT &default_val) const {
				VectorT ret = default_val;
				GetVector(name, VectorT::dimension, &ret[0]);
				return ret;
				}

				template <typename DataTypeT>
				bool Options::GetVector(const std::string &name, int num_dims,
				DataTypeT *out_val) const {
				const auto it = options_.find(name);
				if (it == options_.end())
				return false;
				const std::string value = it->second;
				if (value.length() == 0)
				return true; // Option set but no data is present
				const char *act_str = value.c_str();
				char *next_str;
				for (int i = 0; i < num_dims; ++i) {
				if (std::is_integral<DataTypeT>::value) {
				#ifdef ANDROID
				const int val = strtol(act_str, &next_str, 10);
				#else
				const int val = std::strtol(act_str, &next_str, 10);
				#endif
				if (act_str == next_str)
				return true; // End reached.
				act_str = next_str;
				out_val[i] = static_cast<DataTypeT>(val);
				} else {
				#ifdef ANDROID
				const float val = strtof(act_str, &next_str);
				#else
				const float val = std::strtof(act_str, &next_str);
				#endif
				if (act_str == next_str)
				return true; // End reached.
				act_str = next_str;
				out_val[i] = static_cast<DataTypeT>(val);
				}
				}
				return true;
				}

				} // namespace draco

				#endif // DRACO_CORE_OPTIONS_H_