Commit 18ad3b16595c856df936a84304f47c923f160ca3
1 parent
65c13302
exception on parse error
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2 changed files
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122 additions
and
91 deletions
src/cxxopts.hpp
| ... | ... | @@ -28,6 +28,8 @@ THE SOFTWARE. |
| 28 | 28 | #include <exception> |
| 29 | 29 | #include <sstream> |
| 30 | 30 | |
| 31 | +#include <iostream> | |
| 32 | + | |
| 31 | 33 | namespace cxxopts |
| 32 | 34 | { |
| 33 | 35 | class Value |
| ... | ... | @@ -41,97 +43,6 @@ namespace cxxopts |
| 41 | 43 | has_arg() const = 0; |
| 42 | 44 | }; |
| 43 | 45 | |
| 44 | - namespace values | |
| 45 | - { | |
| 46 | - template <typename T> | |
| 47 | - void | |
| 48 | - parse_value(const std::string& text, T& value) | |
| 49 | - { | |
| 50 | - std::istringstream is(text); | |
| 51 | - if (!(is >> value)) | |
| 52 | - { | |
| 53 | - } | |
| 54 | - | |
| 55 | - if (!is.eof()) | |
| 56 | - { | |
| 57 | - } | |
| 58 | - } | |
| 59 | - | |
| 60 | - template <typename T> | |
| 61 | - void | |
| 62 | - parse_value(const std::string& text, std::vector<T>& value) | |
| 63 | - { | |
| 64 | - T v; | |
| 65 | - parse_value(text, v); | |
| 66 | - value.push_back(v); | |
| 67 | - } | |
| 68 | - | |
| 69 | - template <typename T> | |
| 70 | - struct value_has_arg | |
| 71 | - { | |
| 72 | - static constexpr bool value = true; | |
| 73 | - }; | |
| 74 | - | |
| 75 | - template <> | |
| 76 | - struct value_has_arg<bool> | |
| 77 | - { | |
| 78 | - static constexpr bool value = false; | |
| 79 | - }; | |
| 80 | - | |
| 81 | - template <typename T> | |
| 82 | - class default_value : public Value | |
| 83 | - { | |
| 84 | - public: | |
| 85 | - default_value() | |
| 86 | - : m_result(std::make_shared<T>()) | |
| 87 | - , m_store(m_result.get()) | |
| 88 | - { | |
| 89 | - } | |
| 90 | - | |
| 91 | - default_value(T* t) | |
| 92 | - : m_store(t) | |
| 93 | - { | |
| 94 | - } | |
| 95 | - | |
| 96 | - void | |
| 97 | - parse(const std::string& text) const | |
| 98 | - { | |
| 99 | - parse_value(text, *m_store); | |
| 100 | - } | |
| 101 | - | |
| 102 | - bool | |
| 103 | - has_arg() const | |
| 104 | - { | |
| 105 | - return value_has_arg<T>::value; | |
| 106 | - } | |
| 107 | - | |
| 108 | - const T& | |
| 109 | - get() const | |
| 110 | - { | |
| 111 | - if (m_store == nullptr) | |
| 112 | - { | |
| 113 | - return *m_result; | |
| 114 | - } | |
| 115 | - else | |
| 116 | - { | |
| 117 | - return *m_store; | |
| 118 | - } | |
| 119 | - } | |
| 120 | - | |
| 121 | - private: | |
| 122 | - std::shared_ptr<T> m_result; | |
| 123 | - T* m_store; | |
| 124 | - }; | |
| 125 | - | |
| 126 | - } | |
| 127 | - | |
| 128 | - template <typename T> | |
| 129 | - std::shared_ptr<Value> | |
| 130 | - value() | |
| 131 | - { | |
| 132 | - return std::make_shared<values::default_value<T>>(); | |
| 133 | - } | |
| 134 | - | |
| 135 | 46 | class OptionException : public std::exception |
| 136 | 47 | { |
| 137 | 48 | public: |
| ... | ... | @@ -238,6 +149,120 @@ namespace cxxopts |
| 238 | 149 | } |
| 239 | 150 | }; |
| 240 | 151 | |
| 152 | + class argument_incorrect_type : public OptionParseException | |
| 153 | + { | |
| 154 | + public: | |
| 155 | + argument_incorrect_type | |
| 156 | + ( | |
| 157 | + const std::string& arg | |
| 158 | + ) | |
| 159 | + : OptionParseException( | |
| 160 | + u8"Argument โ" + arg + u8"โ failed to parse" | |
| 161 | + ) | |
| 162 | + { | |
| 163 | + } | |
| 164 | + }; | |
| 165 | + | |
| 166 | + namespace values | |
| 167 | + { | |
| 168 | + template <typename T> | |
| 169 | + void | |
| 170 | + parse_value(const std::string& text, T& value) | |
| 171 | + { | |
| 172 | + std::istringstream is(text); | |
| 173 | + if (!(is >> value)) | |
| 174 | + { | |
| 175 | + std::cerr << "cannot parse empty value" << std::endl; | |
| 176 | + throw argument_incorrect_type(text); | |
| 177 | + } | |
| 178 | + | |
| 179 | + if (!is.eof()) | |
| 180 | + { | |
| 181 | + throw argument_incorrect_type(text); | |
| 182 | + } | |
| 183 | + } | |
| 184 | + | |
| 185 | + template <typename T> | |
| 186 | + void | |
| 187 | + parse_value(const std::string& text, std::vector<T>& value) | |
| 188 | + { | |
| 189 | + T v; | |
| 190 | + parse_value(text, v); | |
| 191 | + value.push_back(v); | |
| 192 | + } | |
| 193 | + | |
| 194 | + void | |
| 195 | + parse_value(const std::string& text, bool& value) | |
| 196 | + { | |
| 197 | + value = true; | |
| 198 | + } | |
| 199 | + | |
| 200 | + template <typename T> | |
| 201 | + struct value_has_arg | |
| 202 | + { | |
| 203 | + static constexpr bool value = true; | |
| 204 | + }; | |
| 205 | + | |
| 206 | + template <> | |
| 207 | + struct value_has_arg<bool> | |
| 208 | + { | |
| 209 | + static constexpr bool value = false; | |
| 210 | + }; | |
| 211 | + | |
| 212 | + template <typename T> | |
| 213 | + class default_value : public Value | |
| 214 | + { | |
| 215 | + public: | |
| 216 | + default_value() | |
| 217 | + : m_result(std::make_shared<T>()) | |
| 218 | + , m_store(m_result.get()) | |
| 219 | + { | |
| 220 | + } | |
| 221 | + | |
| 222 | + default_value(T* t) | |
| 223 | + : m_store(t) | |
| 224 | + { | |
| 225 | + } | |
| 226 | + | |
| 227 | + void | |
| 228 | + parse(const std::string& text) const | |
| 229 | + { | |
| 230 | + parse_value(text, *m_store); | |
| 231 | + } | |
| 232 | + | |
| 233 | + bool | |
| 234 | + has_arg() const | |
| 235 | + { | |
| 236 | + return value_has_arg<T>::value; | |
| 237 | + } | |
| 238 | + | |
| 239 | + const T& | |
| 240 | + get() const | |
| 241 | + { | |
| 242 | + if (m_store == nullptr) | |
| 243 | + { | |
| 244 | + return *m_result; | |
| 245 | + } | |
| 246 | + else | |
| 247 | + { | |
| 248 | + return *m_store; | |
| 249 | + } | |
| 250 | + } | |
| 251 | + | |
| 252 | + private: | |
| 253 | + std::shared_ptr<T> m_result; | |
| 254 | + T* m_store; | |
| 255 | + }; | |
| 256 | + | |
| 257 | + } | |
| 258 | + | |
| 259 | + template <typename T> | |
| 260 | + std::shared_ptr<Value> | |
| 261 | + value() | |
| 262 | + { | |
| 263 | + return std::make_shared<values::default_value<T>>(); | |
| 264 | + } | |
| 265 | + | |
| 241 | 266 | class OptionAdder; |
| 242 | 267 | |
| 243 | 268 | class OptionDetails | ... | ... |
src/example.cpp
| ... | ... | @@ -43,6 +43,7 @@ int main(int argc, char* argv[]) |
| 43 | 43 | ("long-description", |
| 44 | 44 | "thisisareallylongwordthattakesupthewholelineandcannotbebrokenataspace") |
| 45 | 45 | ("help", "Print help") |
| 46 | + ("int", "An integer", cxxopts::value<int>()) | |
| 46 | 47 | ; |
| 47 | 48 | |
| 48 | 49 | options.parse_positional("positional"); |
| ... | ... | @@ -80,6 +81,11 @@ int main(int argc, char* argv[]) |
| 80 | 81 | << std::endl; |
| 81 | 82 | } |
| 82 | 83 | |
| 84 | + if (options.count("int")) | |
| 85 | + { | |
| 86 | + std::cout << "int = " << options["int"].as<int>() << std::endl; | |
| 87 | + } | |
| 88 | + | |
| 83 | 89 | std::cout << "Arguments remain = " << argc << std::endl; |
| 84 | 90 | |
| 85 | 91 | } catch (const cxxopts::OptionException& e) | ... | ... |