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| // | ||
| // Copyright Aliaksei Levin ([email protected]), Arseny Smirnov ([email protected]) 2014-2020 | ||
| // | ||
| // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| // | ||
| #include "td/utils/OptionParser.h" | ||
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| #include "td/utils/misc.h" | ||
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| #include <cstring> | ||
| #include <unordered_map> | ||
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| namespace td { | ||
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| void OptionParser::set_description(string description) { | ||
| description_ = std::move(description); | ||
| } | ||
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| void OptionParser::add_option(Option::Type type, char short_key, Slice long_key, Slice description, | ||
| std::function<Status(Slice)> callback) { | ||
| options_.push_back(Option{type, short_key, long_key.str(), description.str(), std::move(callback)}); | ||
| } | ||
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| void OptionParser::add_option(char short_key, Slice long_key, Slice description, | ||
| std::function<Status(Slice)> callback) { | ||
| add_option(Option::Type::Arg, short_key, long_key, description, std::move(callback)); | ||
| } | ||
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| void OptionParser::add_option(char short_key, Slice long_key, Slice description, std::function<Status(void)> callback) { | ||
| // Ouch. There must be some better way | ||
| add_option(Option::Type::NoArg, short_key, long_key, description, | ||
| std::bind([](std::function<Status(void)> &func, Slice) { return func(); }, std::move(callback), | ||
| std::placeholders::_1)); | ||
| } | ||
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| Result<vector<char *>> OptionParser::run(int argc, char *argv[]) { | ||
| std::unordered_map<char, const Option *> short_options; | ||
| std::unordered_map<string, const Option *> long_options; | ||
| for (auto &opt : options_) { | ||
| if (opt.short_key != '\0') { | ||
| short_options[opt.short_key] = &opt; | ||
| } | ||
| if (!opt.long_key.empty()) { | ||
| long_options[opt.long_key] = &opt; | ||
| } | ||
| } | ||
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| vector<char *> non_options; | ||
| for (int arg_pos = 1; arg_pos < argc; arg_pos++) { | ||
| const char *arg = argv[arg_pos]; | ||
| if (arg[0] != '-' || arg[1] == '\0') { | ||
| non_options.push_back(argv[arg_pos]); | ||
| continue; | ||
| } | ||
| if (arg[1] == '-' && arg[2] == '\0') { | ||
| // "--"; after it everything is non-option | ||
| while (++arg_pos < argc) { | ||
| non_options.push_back(argv[arg_pos]); | ||
| } | ||
| break; | ||
| } | ||
|
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| if (arg[1] == '-') { | ||
| // long option | ||
| Slice long_arg(arg + 2, std::strlen(arg + 2)); | ||
| Slice param; | ||
| auto equal_pos = long_arg.find('='); | ||
| bool has_equal = equal_pos != Slice::npos; | ||
| if (has_equal) { | ||
| param = long_arg.substr(equal_pos + 1); | ||
| long_arg = long_arg.substr(0, equal_pos); | ||
| } | ||
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| auto it = long_options.find(long_arg.str()); | ||
| if (it == long_options.end()) { | ||
| return Status::Error(PSLICE() << "Option " << long_arg << " was unrecognized"); | ||
| } | ||
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| auto option = it->second; | ||
| switch (option->type) { | ||
| case Option::Type::NoArg: | ||
| if (has_equal) { | ||
| return Status::Error(PSLICE() << "Option " << long_arg << " must not have argument"); | ||
| } | ||
| break; | ||
| case Option::Type::Arg: | ||
| if (!has_equal) { | ||
| if (++arg_pos == argc) { | ||
| return Status::Error(PSLICE() << "Option " << long_arg << " must have argument"); | ||
| } | ||
| param = Slice(argv[arg_pos], std::strlen(argv[arg_pos])); | ||
| } | ||
| break; | ||
| default: | ||
| UNREACHABLE(); | ||
| } | ||
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| TRY_STATUS(option->arg_callback(param)); | ||
| continue; | ||
| } | ||
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| for (size_t opt_pos = 1; arg[opt_pos] != '\0'; opt_pos++) { | ||
| auto it = short_options.find(arg[opt_pos]); | ||
| if (it == short_options.end()) { | ||
| return Status::Error(PSLICE() << "Option " << arg[opt_pos] << " was unrecognized"); | ||
| } | ||
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| auto option = it->second; | ||
| Slice param; | ||
| switch (option->type) { | ||
| case Option::Type::NoArg: | ||
| // nothing to do | ||
| break; | ||
| case Option::Type::Arg: | ||
| if (arg[opt_pos + 1] == '\0') { | ||
| if (++arg_pos == argc) { | ||
| return Status::Error(PSLICE() << "Option " << arg[opt_pos] << " must have argument"); | ||
| } | ||
| param = Slice(argv[arg_pos], std::strlen(argv[arg_pos])); | ||
| } else { | ||
| param = Slice(arg + opt_pos + 1, std::strlen(arg + opt_pos + 1)); | ||
| opt_pos += param.size(); | ||
| } | ||
| break; | ||
| default: | ||
| UNREACHABLE(); | ||
| } | ||
|
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| TRY_STATUS(option->arg_callback(param)); | ||
| } | ||
| } | ||
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| return std::move(non_options); | ||
| } | ||
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| StringBuilder &operator<<(StringBuilder &sb, const OptionParser &o) { | ||
| sb << o.description_ << "\n"; | ||
| for (auto &opt : o.options_) { | ||
| sb << "-" << opt.short_key; | ||
| if (!opt.long_key.empty()) { | ||
| sb << "|--" << opt.long_key; | ||
| } | ||
| if (opt.type != OptionParser::Option::Type::NoArg) { | ||
| sb << "<arg>"; | ||
| } | ||
| sb << "\t" << opt.description; | ||
| sb << "\n"; | ||
| } | ||
| return sb; | ||
| } | ||
|
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| } // namespace td |
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