| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| #include "linkerconfig/variables.h" |
| |
| #include <android-base/properties.h> |
| #include <regex> |
| #include <sstream> |
| |
| #include "linkerconfig/log.h" |
| |
| namespace { |
| constexpr const char* kVariableRegex = |
| "@\\{([^@\\{\\}:]+)(:([^@\\{\\}:]*))?\\}"; |
| } |
| |
| namespace android { |
| namespace linkerconfig { |
| namespace modules { |
| |
| std::map<std::string, std::string> Variables::variables_; |
| |
| std::optional<std::string> Variables::GetValue(const std::string& variable) { |
| // If variable is in predefined key-value pair, use this value |
| if (variables_.find(variable) != variables_.end() && |
| !variables_[variable].empty()) { |
| return {variables_[variable]}; |
| } |
| |
| // If variable is defined as property, use this value |
| std::string prop_value = android::base::GetProperty(variable, ""); |
| if (!prop_value.empty()) { |
| return {prop_value}; |
| } |
| |
| // If cannot find variable, return default value |
| return std::nullopt; |
| } |
| |
| void Variables::AddValue(const std::string& key, const std::string& value) { |
| variables_[key] = value; |
| } |
| |
| std::string Variables::ResolveVariables(const std::string& str) { |
| std::string result = str; |
| std::regex variable_regex(kVariableRegex); |
| std::smatch sm; |
| |
| while (std::regex_search(result, sm, variable_regex)) { |
| std::stringstream ss; |
| ss << sm.prefix(); |
| auto resolved_value = GetValue(sm[1]); |
| if (resolved_value.has_value()) { |
| ss << resolved_value.value(); |
| } else { |
| LOG(WARNING) << "Unable to find value for " << sm[1]; |
| bool contains_default = sm[2].length() > 0; |
| if (contains_default) { |
| ss << sm[3]; |
| } else { |
| LOG(FATAL) << "There is no default value defined for " << sm[1]; |
| } |
| } |
| ss << ResolveVariables(sm.suffix()); |
| result = ss.str(); |
| } |
| |
| return result; |
| } |
| } // namespace modules |
| } // namespace linkerconfig |
| } // namespace android |