Program Listing for File yaml_parser.hpp

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/* * SPDX-FileCopyrightText: Copyright (c) 2022-2023 NVIDIA CORPORATION & AFFILIATES. All rights reserved. * SPDX-License-Identifier: Apache-2.0 * * 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 HOLOSCAN_UTILS_YAML_PARSER_HPP #define HOLOSCAN_UTILS_YAML_PARSER_HPP #include <yaml-cpp/yaml.h> #include <iostream> #include <memory> #include <regex> #include <sstream> #include <string> #include <utility> #include <vector> #include "../core/common.hpp" namespace { bool is_space(unsigned char c) { return c == ' '; } } // namespace template <typename typeT> struct YAML::convert<std::complex<typeT>> { static Node encode(const std::complex<typeT>& data) { Node node; node = std::string{fmt::format("{}{}{}j", data.real(), (data.imag() < 0) ? "" : "+", data.imag())}; return node; } static bool decode(const Node& node, std::complex<typeT>& data) { if (!node.IsScalar()) { HOLOSCAN_LOG_ERROR("complex<T> decode: expected a scalar"); return false; } std::string value = node.as<std::string>(); std::regex complex_reg("\\s*([+-]?\\s?\\d*\\.?\\d+)\\s?([+-]{1}\\s?\\d*\\.?\\d+)[ij]{1}\\s*$"); std::smatch m; if (std::regex_search(value, m, complex_reg)) { if (m.size() != 3) { HOLOSCAN_LOG_ERROR("unexpected match size: {}, matched: {}", m.size(), m.str(0)); } // extract the real and imaginary components of the number std::string real_str = m.str(1); std::string imag_str = m.str(2); // remove any white space around + or - (necessary for std::stod to work) real_str.erase(std::remove_if(real_str.begin(), real_str.end(), is_space), real_str.end()); imag_str.erase(std::remove_if(imag_str.begin(), imag_str.end(), is_space), imag_str.end()); // format real and imaginary strings as floating point double real = std::stod(real_str); double imag = std::stod(imag_str); data = std::complex<typeT>(real, imag); } else { HOLOSCAN_LOG_ERROR("failed to match expected regex for complex<T>"); return false; } return true; } }; namespace holoscan { template <typename typeT, typename valueT = void> struct YAMLNodeParser; template <typename typeT> struct YAMLNodeParser<typeT> { static typeT parse(const YAML::Node& node) { try { return node.as<typeT>(); } catch (...) { std::stringstream ss; ss << node; HOLOSCAN_LOG_ERROR("Unable to parse YAML node: '{}'", ss.str()); return typeT(); } } }; template <> struct YAMLNodeParser<int8_t> { static uint8_t parse(const YAML::Node& node) { try { return static_cast<int8_t>(node.as<int32_t>()); } catch (...) { std::stringstream ss; ss << node; HOLOSCAN_LOG_ERROR("Unable to parse YAML node: '{}'", ss.str()); return 0; } } }; template <> struct YAMLNodeParser<uint8_t> { static uint8_t parse(const YAML::Node& node) { try { return static_cast<uint8_t>(node.as<uint32_t>()); } catch (...) { std::stringstream ss; ss << node; HOLOSCAN_LOG_ERROR("Unable to parse YAML node: '{}'", ss.str()); return 0; } } }; template <typename typeT> struct YAMLNodeParser<std::complex<typeT>> { static std::complex<typeT> parse(const YAML::Node& node) { try { return static_cast<std::complex<typeT>>(node.as<std::complex<typeT>>()); } catch (...) { std::stringstream ss; ss << node; HOLOSCAN_LOG_ERROR("Unable to parse YAML node: '{}'", ss.str()); return 0; } } }; template <typename typeT> struct YAMLNodeParser<std::vector<typeT>> { static std::vector<typeT> parse(const YAML::Node& node) { if (!node.IsSequence()) { std::stringstream ss; ss << node; HOLOSCAN_LOG_ERROR("Unable to parse YAML node: '{}'. It is not a sequence.", ss.str()); return std::vector<typeT>(); } std::vector<typeT> result(node.size()); for (size_t i = 0; i < node.size(); i++) { const auto value = YAMLNodeParser<typeT>::parse(node[i]); // TODO: check if value is valid result[i] = std::move(value); } return result; } }; template <typename typeT, std::size_t N> struct YAMLNodeParser<std::array<typeT, N>> { static std::array<typeT, N> parse(const YAML::Node& node) { if (!node.IsSequence()) { std::stringstream ss; ss << node; HOLOSCAN_LOG_ERROR("Unable to parse YAML node: '{}'. It is not a sequence.", ss.str()); return std::array<typeT, N>(); } if (node.size() != N) { std::stringstream ss; ss << node; HOLOSCAN_LOG_ERROR( "Unable to parse YAML node: '{}'. It is not a sequence of size {}.", ss.str(), N); return std::array<typeT, N>(); } std::array<typeT, N> result; for (size_t i = 0; i < node.size(); i++) { const auto value = YAMLNodeParser<typeT>::parse(node[i]); // TODO: check if value is valid result[i] = std::move(value); } return result; } }; // Skip std::shared_ptr<Resource> and std::shared_ptr<Condition> template <typename typeT> struct YAMLNodeParser<std::shared_ptr<typeT>> { static std::shared_ptr<typeT> parse(const YAML::Node&) { return {}; } }; // Skip IOSpec* template <> struct YAMLNodeParser<IOSpec*> { static IOSpec* parse(const YAML::Node&) { return nullptr; } }; // Skip std::vector<IOSpec*> template <> struct YAMLNodeParser<std::vector<IOSpec*>> { static std::vector<IOSpec*> parse(const YAML::Node&) { return {}; } }; } // namespace holoscan #endif/* HOLOSCAN_UTILS_YAML_PARSER_HPP */

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