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88 lines
2.8 KiB
88 lines
2.8 KiB
/* |
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* Copyright (C) 2015 The Android Open Source Project |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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#ifndef _INIT_KEYWORD_MAP_H_ |
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#define _INIT_KEYWORD_MAP_H_ |
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#include <map> |
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#include <string> |
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#include <android-base/stringprintf.h> |
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namespace android { |
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namespace init { |
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template <typename Function> |
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class KeywordMap { |
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public: |
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using FunctionInfo = std::tuple<std::size_t, std::size_t, Function>; |
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using Map = std::map<std::string, FunctionInfo>; |
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virtual ~KeywordMap() { |
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} |
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const Function FindFunction(const std::vector<std::string>& args, std::string* err) const { |
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using android::base::StringPrintf; |
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if (args.empty()) { |
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*err = "keyword needed, but not provided"; |
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return nullptr; |
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} |
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auto& keyword = args[0]; |
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auto num_args = args.size() - 1; |
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auto function_info_it = map().find(keyword); |
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if (function_info_it == map().end()) { |
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*err = StringPrintf("invalid keyword '%s'", keyword.c_str()); |
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return nullptr; |
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} |
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auto function_info = function_info_it->second; |
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auto min_args = std::get<0>(function_info); |
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auto max_args = std::get<1>(function_info); |
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if (min_args == max_args && num_args != min_args) { |
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*err = StringPrintf("%s requires %zu argument%s", |
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keyword.c_str(), min_args, |
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(min_args > 1 || min_args == 0) ? "s" : ""); |
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return nullptr; |
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} |
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if (num_args < min_args || num_args > max_args) { |
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if (max_args == std::numeric_limits<decltype(max_args)>::max()) { |
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*err = StringPrintf("%s requires at least %zu argument%s", |
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keyword.c_str(), min_args, |
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min_args > 1 ? "s" : ""); |
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} else { |
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*err = StringPrintf("%s requires between %zu and %zu arguments", |
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keyword.c_str(), min_args, max_args); |
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} |
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return nullptr; |
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} |
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return std::get<Function>(function_info); |
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} |
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private: |
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// Map of keyword -> |
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// (minimum number of arguments, maximum number of arguments, function pointer) |
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virtual const Map& map() const = 0; |
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}; |
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} // namespace init |
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} // namespace android |
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#endif
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