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annotate C++/OptionParser.cpp @ 229:96ff112d05cf

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Add OptionParser, getopt(3) replacement
author David Demelier <markand@malikania.fr>
date Tue, 17 Jun 2014 17:11:56 +0200
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children ff2db0ed78f1
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229
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1 /*
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2 * OptionParser.cpp -- safe getopt(3) replacement
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3 *
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4 * Copyright (c) 2013, 2014 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 <iostream>
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20 #include <iomanip>
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21
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22 #include "OptionParser.h"
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23
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24 /* --------------------------------------------------------
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25 * Option class
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26 * -------------------------------------------------------- */
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27
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28 Option::Option(const std::string &name, const std::string &help, Type type, int flags)
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29 : m_name(name)
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30 , m_help(help)
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31 , m_type(type)
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32 , m_flags(flags)
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33 {
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34 }
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35
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36 const std::string &Option::name() const
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37 {
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38 return m_name;
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39 }
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40
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41 const std::string &Option::help() const
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42 {
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43 return m_help;
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44 }
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45
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46 Option::Type Option::type() const
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47 {
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48 return m_type;
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49 }
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50
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51 int Option::flags() const
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52 {
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53 return m_flags;
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54 }
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55
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56 /* --------------------------------------------------------
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57 * OptionValue class
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58 * -------------------------------------------------------- */
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59
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60 OptionValue::OptionValue(const std::string &name)
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61 : m_name(name)
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62 , m_enabled(true)
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63 {
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64 }
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65
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66 OptionValue::OptionValue(const std::string &name, const std::string &value)
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67 : m_name(name)
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68 , m_value(value)
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69 {
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70 }
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71
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72 const std::string &OptionValue::name() const
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73 {
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74 return m_name;
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75 }
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76
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77 const std::string &OptionValue::value() const
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78 {
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79 return m_value;
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80 }
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81
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82 OptionValue::operator bool() const
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83 {
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84 return m_enabled;
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85 }
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86
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87 OptionValue::operator std::string() const
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88 {
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89 return m_value;
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90 }
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91
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92 /* --------------------------------------------------------
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93 * OptionResult class
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94 * -------------------------------------------------------- */
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95
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96 auto OptionResult::begin() -> decltype(m_values.begin())
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97 {
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98 return m_values.begin();
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99 }
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100
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101 auto OptionResult::begin() const -> decltype(m_values.begin())
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102 {
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103 return m_values.begin();
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104 }
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105
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106 auto OptionResult::cbegin() const -> decltype(m_values.cbegin())
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107 {
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108 return m_values.begin();
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109 }
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110
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111 auto OptionResult::end() -> decltype(m_values.end())
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112 {
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113 return m_values.end();
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114 }
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115
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116 auto OptionResult::end() const -> decltype(m_values.end())
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117 {
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118 return m_values.end();
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119 }
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120
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121 auto OptionResult::cend() const -> decltype(m_values.cend())
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122 {
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123 return m_values.cend();
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124 }
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125
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126 int OptionResult::count() const
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127 {
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128 return static_cast<int>(m_values.size());
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129 }
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130
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131 int OptionResult::total() const
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132 {
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133 return m_total;
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134 }
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135
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136 /* --------------------------------------------------------
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137 * OptionParser class
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138 * -------------------------------------------------------- */
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139
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140 void OptionParser::add(Option &&option)
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141 {
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142 const auto &name = option.name();
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143
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144 if (name.length() > m_maxlength)
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145 m_maxlength = name.length();
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146
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147 m_options.emplace(std::make_pair(name, std::move(option)));
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148 }
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149
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150 void OptionParser::add(const Option &option)
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151 {
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152 add(const_cast<Option &>(option));
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153 }
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154
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155 OptionResult OptionParser::parse(int argc, char **argv, int flags)
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156 {
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157 OptionResult result;
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158 int i;
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159
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160 for (i = 0; i < argc; ++i) {
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161 /* Not a valid option at all? */
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162 if (m_options.count(argv[i]) == 0) {
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163 log(argv[i], std::string(argv[i]) + " is not a valid option");
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164
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165 if (flags & Strict) {
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166 usage();
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167 break;
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168 } else
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169 continue;
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170 }
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171
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172 /*
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173 * At this step, we have an option name valid, check if it requires
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174 * an argument or not.
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175 */
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176 const auto &option = m_options.at(argv[i]);
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177 const auto &name = option.name();
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178 auto type = option.type();
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179
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180 /*
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181 * Already present and must appears only once?
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182 */
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183 if (option.flags() & Option::Single && m_placed.count(name) > 0) {
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184 if (!(flags & Silent)) {
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185 log(name, "option " + name + " must appear only once");
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186
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187 if (flags & Strict) {
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188 usage();
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189 break;
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190 }
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191 } else if (flags & Strict)
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192 break;
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193 }
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194
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195 /*
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196 * Need an argument or it is a simple switch ?
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197 */
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198 if (type == Option::Type::Switch)
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199 result.m_values.push_back(OptionValue(name));
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200 else {
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201 if (i + 1 >= argc)
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202 result.m_values.push_back(OptionValue(name, ""));
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203 else {
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204 result.m_values.push_back(OptionValue(name, argv[i + 1]));
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205 ++ i;
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206 }
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207 }
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208
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209 m_placed.insert(name);
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210 }
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211
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212 result.m_total = i;
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213
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214 return result;
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215 }
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216
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217 void OptionParser::usage()
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218 {
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219 std::cout << "options available: " << std::endl;
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220
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221 for (const auto &option : m_options)
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222 std::cout << " " << std::setw(m_maxlength) << option.second.name() << "\t" << option.second.help() << std::endl;
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223 }
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224
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225 void OptionParser::log(const std::string &, const std::string &error)
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226 {
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227 std::cout << error << std::endl;
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228 }