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annotate cpp/options/options.hpp @ 658:868663a44b5e

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options: use std::string_view::compare for better readability
author David Demelier <markand@malikania.fr>
date Mon, 15 Jul 2019 20:58:11 +0200
parents 11fa64b69530
children 913c8ef054d3
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657
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1 /*
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2 * options.hpp -- getopt(3) similar interface for C++
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3 *
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4 * Copyright (c) 2019 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 #ifndef OPTIONS_HPP
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20 #define OPTIONS_HPP
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21
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22 /**
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23 * \file options.hpp
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24 * \brief C++ alternative to getopt(3).
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25 */
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26
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27 #include <stdexcept>
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28 #include <string>
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29 #include <string_view>
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30 #include <tuple>
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31 #include <unordered_map>
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32 #include <vector>
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33
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34 /**
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35 * \brief C++ alternative to getopt(3).
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36 */
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37 namespace options {
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38
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39 /**
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40 * Store the positional arguments and options.
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41 */
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42 using pack = std::tuple<
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43 std::vector<std::string>,
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44 std::unordered_multimap<char, std::string>
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45 >;
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46
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47 /**
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48 * Parse a collection of options and arguments.
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49 *
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50 * This function uses the same format as getopt(3) function, you need specify
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51 * each option in the fmt string and add a colon after the option character if
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52 * it requires a value.
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53 *
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54 * If a -- option appears in the argument list, it stops option parsing and all
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55 * next tokens are considered arguments even if they start with an hyphen.
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56 *
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57 * Example of format strings:
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58 *
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59 * - "abc": are all three boolean options,
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60 * - "c:v": v is a boolean option c requires a value.
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61 *
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62 * Example of invocation:
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63 *
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64 * - `mycli -v -a`: is similar to `-va` if both 'v' and 'a' are boolean options,
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65 * - `mycli -v -- -c`: -c will be a positional argument rather than an option
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66 * but '-v' is still an option.
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67 *
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68 * \tparam InputIt must dereference a string type (literal, std::string_view or
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69 * std::string)
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70 * \param it the first item
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71 * \param end the next item
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72 * \param fmt the format string
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73 * \return the result
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74 */
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75 template <typename InputIt>
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76 inline auto parse(InputIt it, InputIt end, std::string_view fmt) -> pack
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77 {
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78 pack result;
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79
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80 for (; it != end; ++it) {
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81 const std::string_view token(*it);
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82
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83 if (token == "--") {
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84 for (++it; it != end; ++it)
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85 std::get<0>(result).push_back(std::string(*it));
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86 break;
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87 }
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88
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89 if (token.compare(0, 1, "-") != 0) {
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90 std::get<0>(result).push_back(std::string(token));
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91 continue;
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92 }
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93
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94 const auto sub = it->substr(1);
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95
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96 for (std::size_t i = 0U; i < sub.size(); ++i) {
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97 const auto idx = fmt.find(sub[i]);
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98
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99 if (idx == std::string_view::npos)
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100 throw std::runtime_error("invalid option");
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101
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102 if (fmt.compare(idx + 1U, 1, ":") != 0) {
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103 std::get<1>(result).emplace(sub[i], "");
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104 continue;
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105 }
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106
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107 if (idx + 1U < sub.size()) {
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108 std::get<1>(result).emplace(sub[i], std::string(sub.substr(i + 1)));
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109 break;
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110 }
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111
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112 if (++it == end || std::string_view(*it).compare(0U, 1U, "-") == 0)
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113 throw std::runtime_error("option require a value");
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114
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115 std::get<1>(result).emplace(sub[i], std::string(*it));
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116 }
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117 }
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118
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119 return result;
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120 }
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121
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122 /**
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123 * Convenient overload with an initializer_list.
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124 *
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125 * \tparam StringType must be either a std::string or std::string_view
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126 * \param args the arguments
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127 * \param fmt the format string
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128 * \return the result
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129 */
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130 inline auto parse(std::initializer_list<std::string_view> args, std::string_view fmt) -> pack
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131 {
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132 return parse(args.begin(), args.end(), fmt);
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133 }
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134
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135 /**
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136 * Convenient overload for main() arguments.
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137 *
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138 * \param argc the number of arguments
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139 * \param argv the arguments
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140 * \param fmt the format string
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141 * \return the result
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142 */
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143 inline auto parse(int argc, char** argv, std::string_view fmt) -> pack
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144 {
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145 std::vector<std::string_view> args(argc);
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146
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147 for (int i = 0; i < argc; ++i)
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148 args[i] = argv[i];
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149
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150 return parse(args.begin(), args.end(), fmt);
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151 }
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152
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153
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154 } // !options
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155
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156 #endif // !OPTIONS_HPP