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1 /* |
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2 * options.cpp -- parse Unix command line options |
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3 * |
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4 * Copyright (c) 2015 David Demelier <markand@malikania.fr> |
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5 * |
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6 * Permission to use, copy, modify, and/or distribute this software for any |
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7 * purpose with or without fee is hereby granted, provided that the above |
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8 * copyright notice and this permission notice appear in all copies. |
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9 * |
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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17 */ |
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18 |
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19 #include <cassert> |
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20 |
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21 #include "options.h" |
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22 |
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23 namespace option { |
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24 |
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25 namespace { |
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26 |
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27 using Iterator = std::vector<std::string>::iterator; |
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28 using Args = std::vector<std::string>; |
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29 |
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30 inline bool isOption(const std::string &arg) noexcept |
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31 { |
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32 return arg.size() >= 2 && arg[0] == '-'; |
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33 } |
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34 |
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35 inline bool isLongOption(const std::string &arg) noexcept |
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36 { |
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37 assert(isOption(arg)); |
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38 |
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39 return arg.size() >= 3 && arg[1] == '-'; |
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40 } |
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41 |
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42 inline bool isShortSimple(const std::string &arg) noexcept |
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43 { |
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44 assert(isOption(arg)); |
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45 assert(!isLongOption(arg)); |
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46 |
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47 return arg.size() == 2; |
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48 } |
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49 |
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50 void parseLongOption(Result &result, Args &args, Iterator &it, Iterator &end, const Options &definition) |
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51 { |
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52 auto arg = *it++; |
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53 auto opt = definition.find(arg); |
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54 |
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55 if (opt == definition.end()) { |
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56 throw InvalidOption{arg}; |
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57 } |
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58 |
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59 /* Need argument? */ |
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60 if (opt->second) { |
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61 if (it == end || isOption(*it)) { |
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62 throw MissingValue{arg}; |
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63 } |
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64 |
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65 result.insert(std::make_pair(arg, *it++)); |
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66 it = args.erase(args.begin(), it); |
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67 end = args.end(); |
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68 } else { |
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69 result.insert(std::make_pair(arg, "")); |
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70 it = args.erase(args.begin()); |
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71 end = args.end(); |
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72 } |
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73 } |
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74 |
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75 void parseShortOption(Result &result, Args &args, Iterator &it, Iterator &end, const Options &definition) |
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76 { |
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77 if (isShortSimple(*it)) { |
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78 /* |
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79 * Here two cases: |
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80 * |
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81 * -v (no option) |
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82 * -c value |
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83 */ |
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84 auto arg = *it++; |
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85 auto opt = definition.find(arg); |
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86 |
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87 if (opt == definition.end()) { |
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88 throw InvalidOption{arg}; |
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89 } |
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90 |
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91 /* Need argument? */ |
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92 if (opt->second) { |
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93 if (it == end || isOption(*it)) { |
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94 throw MissingValue{arg}; |
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95 } |
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96 |
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97 result.insert(std::make_pair(arg, *it++)); |
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98 it = args.erase(args.begin(), it); |
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99 end = args.end(); |
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100 } else { |
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101 result.insert(std::make_pair(arg, "")); |
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102 it = args.erase(args.begin()); |
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103 end = args.end(); |
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104 } |
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105 } else { |
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106 /* |
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107 * Here multiple scenarios: |
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108 * |
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109 * 1. -abc (-a -b -c if all are simple boolean arguments) |
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110 * 2. -vc foo.conf (-v -c foo.conf if -c is argument dependant) |
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111 * 3. -vcfoo.conf (-v -c foo.conf also) |
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112 */ |
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113 auto value = it->substr(1); |
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114 auto len = value.length(); |
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115 int toremove = 1; |
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116 |
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117 for (decltype(len) i = 0; i < len; ++i) { |
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118 auto arg = std::string{'-'} + value[i]; |
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119 auto opt = definition.find(arg); |
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120 |
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121 if (opt == definition.end()) { |
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122 throw InvalidOption{arg}; |
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123 } |
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124 |
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125 if (opt->second) { |
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126 if (i == (len - 1)) { |
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127 /* End of string, get the next argument (see 2.) */ |
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128 if (++it == end || isOption(*it)) { |
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129 throw MissingValue{arg}; |
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130 } |
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131 |
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132 result.insert(std::make_pair(arg, *it)); |
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133 toremove += 1; |
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134 } else { |
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135 result.insert(std::make_pair(arg, value.substr(i + 1))); |
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136 i = len; |
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137 } |
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138 } else { |
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139 result.insert(std::make_pair(arg, "")); |
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140 } |
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141 } |
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142 |
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143 it = args.erase(args.begin(), args.begin() + toremove); |
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144 end = args.end(); |
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145 } |
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146 } |
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147 |
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148 } // !namespace |
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149 |
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150 Result read(std::vector<std::string> &args, const Options &definition) |
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151 { |
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152 Result result; |
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153 |
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154 auto it = args.begin(); |
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155 auto end = args.end(); |
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156 |
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157 while (it != end) { |
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158 if (!isOption(*it)) { |
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159 break; |
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160 } |
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161 |
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162 if (isLongOption(*it)) { |
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163 parseLongOption(result, args, it, end, definition); |
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164 } else { |
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165 parseShortOption(result, args, it, end, definition); |
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166 } |
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167 } |
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168 |
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169 return result; |
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170 } |
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171 |
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172 Result read(int &argc, char **&argv, const Options &definition) |
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173 { |
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174 std::vector<std::string> args; |
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175 |
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176 for (int i = 0; i < argc; ++i) { |
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177 args.push_back(argv[i]); |
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178 } |
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179 |
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180 auto before = args.size(); |
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181 auto result = read(args, definition); |
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182 |
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183 argc -= before - args.size(); |
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184 argv += before - args.size(); |
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185 |
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186 return result; |
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187 } |
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188 |
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189 } // !option |
