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parse_options.cpp
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115 lines (107 loc) · 3.27 KB
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/*
* Copyright 2014 Andrew Ayer
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name(s) of the above copyright
* holders shall not be used in advertising or otherwise to promote the
* sale, use or other dealings in this Software without prior written
* authorization.
*/
#include "parse_options.hpp"
#include <cstring>
static const Option_def* find_option (const Options_list& options, const std::string& name)
{
for (Options_list::const_iterator opt(options.begin()); opt != options.end(); ++opt) {
if (opt->name == name) {
return &*opt;
}
}
return 0;
}
int parse_options (const Options_list& options, int argc, const char** argv)
{
int argi = 0;
while (argi < argc && argv[argi][0] == '-' && argv[argi][1] != '\0') {
if (std::strcmp(argv[argi], "--") == 0) {
++argi;
break;
} else if (std::strncmp(argv[argi], "--", 2) == 0) {
std::string option_name;
const char* option_value = 0;
if (const char* eq = std::strchr(argv[argi], '=')) {
option_name.assign(argv[argi], eq);
option_value = eq + 1;
} else {
option_name = argv[argi];
}
++argi;
const Option_def* opt(find_option(options, option_name));
if (!opt) {
throw Option_error(option_name, "Invalid option");
}
if (opt->is_set) {
*opt->is_set = true;
}
if (opt->value) {
if (option_value) {
*opt->value = option_value;
} else {
if (argi >= argc) {
throw Option_error(option_name, "Option requires a value");
}
*opt->value = argv[argi];
++argi;
}
} else {
if (option_value) {
throw Option_error(option_name, "Option takes no value");
}
}
} else {
const char* arg = argv[argi] + 1;
++argi;
while (*arg) {
std::string option_name("-");
option_name.push_back(*arg);
++arg;
const Option_def* opt(find_option(options, option_name));
if (!opt) {
throw Option_error(option_name, "Invalid option");
}
if (opt->is_set) {
*opt->is_set = true;
}
if (opt->value) {
if (*arg) {
*opt->value = arg;
} else {
if (argi >= argc) {
throw Option_error(option_name, "Option requires a value");
}
*opt->value = argv[argi];
++argi;
}
break;
}
}
}
}
return argi;
}