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annotate modules/options/options.cpp @ 508:8fc7fe1ec915
Sockets: pass Condition by reference, fix Tls
| author | David Demelier <markand@malikania.fr> |
|---|---|
| date | Tue, 23 Feb 2016 12:04:40 +0100 |
| parents | d8ed4da7688c |
| children | f48bb09bccc7 |
| rev | line source |
|---|---|
| 486 | 1 /* |
| 2 * options.cpp -- parse Unix command line options | |
| 3 * | |
| 4 * Copyright (c) 2015 David Demelier <markand@malikania.fr> | |
| 5 * | |
| 6 * Permission to use, copy, modify, and/or distribute this software for any | |
| 7 * purpose with or without fee is hereby granted, provided that the above | |
| 8 * copyright notice and this permission notice appear in all copies. | |
| 9 * | |
| 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
| 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
| 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
| 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
| 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
| 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
| 17 */ | |
| 18 | |
| 19 #include <cassert> | |
| 20 | |
| 21 #include "options.h" | |
| 22 | |
| 23 namespace option { | |
| 24 | |
| 25 namespace { | |
| 26 | |
| 27 using Iterator = std::vector<std::string>::iterator; | |
| 28 using Args = std::vector<std::string>; | |
| 29 | |
| 30 inline bool isOption(const std::string &arg) noexcept | |
| 31 { | |
| 32 return arg.size() >= 2 && arg[0] == '-'; | |
| 33 } | |
| 34 | |
| 35 inline bool isLongOption(const std::string &arg) noexcept | |
| 36 { | |
| 37 assert(isOption(arg)); | |
| 38 | |
| 39 return arg.size() >= 3 && arg[1] == '-'; | |
| 40 } | |
| 41 | |
| 42 inline bool isShortSimple(const std::string &arg) noexcept | |
| 43 { | |
| 44 assert(isOption(arg)); | |
| 45 assert(!isLongOption(arg)); | |
| 46 | |
| 47 return arg.size() == 2; | |
| 48 } | |
| 49 | |
| 50 void parseLongOption(Result &result, Args &args, Iterator &it, Iterator &end, const Options &definition) | |
| 51 { | |
| 52 auto arg = *it++; | |
| 53 auto opt = definition.find(arg); | |
| 54 | |
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55 if (opt == definition.end()) |
| 486 | 56 throw InvalidOption{arg}; |
| 57 | |
| 58 /* Need argument? */ | |
| 59 if (opt->second) { | |
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60 if (it == end || isOption(*it)) |
| 486 | 61 throw MissingValue{arg}; |
| 62 | |
| 63 result.insert(std::make_pair(arg, *it++)); | |
| 64 it = args.erase(args.begin(), it); | |
| 65 end = args.end(); | |
| 66 } else { | |
| 67 result.insert(std::make_pair(arg, "")); | |
| 68 it = args.erase(args.begin()); | |
| 69 end = args.end(); | |
| 70 } | |
| 71 } | |
| 72 | |
| 73 void parseShortOption(Result &result, Args &args, Iterator &it, Iterator &end, const Options &definition) | |
| 74 { | |
| 75 if (isShortSimple(*it)) { | |
| 76 /* | |
| 77 * Here two cases: | |
| 78 * | |
| 79 * -v (no option) | |
| 80 * -c value | |
| 81 */ | |
| 82 auto arg = *it++; | |
| 83 auto opt = definition.find(arg); | |
| 84 | |
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85 if (opt == definition.end()) |
| 486 | 86 throw InvalidOption{arg}; |
| 87 | |
| 88 /* Need argument? */ | |
| 89 if (opt->second) { | |
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90 if (it == end || isOption(*it)) |
| 486 | 91 throw MissingValue{arg}; |
| 92 | |
| 93 result.insert(std::make_pair(arg, *it++)); | |
| 94 it = args.erase(args.begin(), it); | |
| 95 end = args.end(); | |
| 96 } else { | |
| 97 result.insert(std::make_pair(arg, "")); | |
| 98 it = args.erase(args.begin()); | |
| 99 end = args.end(); | |
| 100 } | |
| 101 } else { | |
| 102 /* | |
| 103 * Here multiple scenarios: | |
| 104 * | |
| 105 * 1. -abc (-a -b -c if all are simple boolean arguments) | |
| 106 * 2. -vc foo.conf (-v -c foo.conf if -c is argument dependant) | |
| 107 * 3. -vcfoo.conf (-v -c foo.conf also) | |
| 108 */ | |
| 109 auto value = it->substr(1); | |
| 110 auto len = value.length(); | |
| 111 int toremove = 1; | |
| 112 | |
| 113 for (decltype(len) i = 0; i < len; ++i) { | |
| 114 auto arg = std::string{'-'} + value[i]; | |
| 115 auto opt = definition.find(arg); | |
| 116 | |
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117 if (opt == definition.end()) |
| 486 | 118 throw InvalidOption{arg}; |
| 119 | |
| 120 if (opt->second) { | |
| 121 if (i == (len - 1)) { | |
| 122 /* End of string, get the next argument (see 2.) */ | |
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123 if (++it == end || isOption(*it)) |
| 486 | 124 throw MissingValue{arg}; |
| 125 | |
| 126 result.insert(std::make_pair(arg, *it)); | |
| 127 toremove += 1; | |
| 128 } else { | |
| 129 result.insert(std::make_pair(arg, value.substr(i + 1))); | |
| 130 i = len; | |
| 131 } | |
| 132 } else { | |
| 133 result.insert(std::make_pair(arg, "")); | |
| 134 } | |
| 135 } | |
| 136 | |
| 137 it = args.erase(args.begin(), args.begin() + toremove); | |
| 138 end = args.end(); | |
| 139 } | |
| 140 } | |
| 141 | |
| 142 } // !namespace | |
| 143 | |
| 144 Result read(std::vector<std::string> &args, const Options &definition) | |
| 145 { | |
| 146 Result result; | |
| 147 | |
| 148 auto it = args.begin(); | |
| 149 auto end = args.end(); | |
| 150 | |
| 151 while (it != end) { | |
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152 if (!isOption(*it)) |
| 486 | 153 break; |
| 154 | |
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parents:
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155 if (isLongOption(*it)) |
| 486 | 156 parseLongOption(result, args, it, end, definition); |
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157 else |
| 486 | 158 parseShortOption(result, args, it, end, definition); |
| 159 } | |
| 160 | |
| 161 return result; | |
| 162 } | |
| 163 | |
| 164 Result read(int &argc, char **&argv, const Options &definition) | |
| 165 { | |
| 166 std::vector<std::string> args; | |
| 167 | |
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parents:
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diff
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168 for (int i = 0; i < argc; ++i) |
| 486 | 169 args.push_back(argv[i]); |
| 170 | |
| 171 auto before = args.size(); | |
| 172 auto result = read(args, definition); | |
| 173 | |
| 174 argc -= before - args.size(); | |
| 175 argv += before - args.size(); | |
| 176 | |
| 177 return result; | |
| 178 } | |
| 179 | |
| 180 } // !option |