/*
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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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#include "result.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 Result<Function> FindFunction(const std::vector<std::string>& args) const {
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using android::base::StringPrintf;
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if (args.empty()) return Error() << "Keyword needed, but not provided";
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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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return Error() << StringPrintf("Invalid keyword '%s'", keyword.c_str());
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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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return Error() << StringPrintf("%s requires %zu argument%s", keyword.c_str(), min_args,
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(min_args > 1 || min_args == 0) ? "s" : "");
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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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return Error() << StringPrintf("%s requires at least %zu argument%s",
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keyword.c_str(), min_args, min_args > 1 ? "s" : "");
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} else {
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return Error() << 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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}
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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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