41 lines
1.4 KiB
C++
41 lines
1.4 KiB
C++
/*
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* ArgParseUtil.h
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2022 Apple Inc. and the FoundationDB project authors
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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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#pragma once
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#ifndef FLOW_ARGPARSEUTIL_H
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#define FLOW_ARGPARSEUTIL_H
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#include "flow/Arena.h"
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// Extracts the key for command line arguments that are specified with a prefix (e.g. --knob-).
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// This function converts any hyphens in the extracted key to underscores.
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Optional<std::string> extractPrefixedArgument(std::string prefix, std::string arg) {
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if (arg.size() <= prefix.size() || arg.find(prefix) != 0 ||
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(arg[prefix.size()] != '-' && arg[prefix.size()] != '_')) {
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return Optional<std::string>();
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}
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arg = arg.substr(prefix.size() + 1);
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std::transform(arg.begin(), arg.end(), arg.begin(), [](int c) { return c == '-' ? '_' : c; });
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return arg;
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}
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#endif
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