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130 lines
3.6 KiB
C++
130 lines
3.6 KiB
C++
/*
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* (C) 2009 Jack Lloyd
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*
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* Distributed under the terms of the Botan license
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*/
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#ifndef BOTAN_CHECK_GETOPT_H__
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#define BOTAN_CHECK_GETOPT_H__
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#include <string>
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#include <vector>
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#include <stdexcept>
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#include <map>
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#include <botan/parsing.h>
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class OptionParser
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{
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public:
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std::vector<std::string> leftovers() const { return leftover; }
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bool is_set(const std::string& key) const
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{
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return (options.find(key) != options.end());
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}
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std::string value(const std::string& key) const
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{
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std::map<std::string, std::string>::const_iterator i = options.find(key);
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if(i == options.end())
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throw std::runtime_error("Option " + key + " not found");
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return i->second;
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}
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std::string value_if_set(const std::string& key) const
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{
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return value_or_else(key, "");
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}
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std::string value_or_else(const std::string& key,
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const std::string& or_else) const
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{
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return is_set(key) ? value(key) : or_else;
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}
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void parse(char* argv[])
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{
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std::vector<std::string> args;
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for(int j = 1; argv[j]; j++)
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args.push_back(argv[j]);
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for(size_t j = 0; j != args.size(); j++)
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{
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std::string arg = args[j];
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if(arg.size() > 2 && arg[0] == '-' && arg[1] == '-')
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{
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const std::string opt_name = arg.substr(0, arg.find('='));
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arg = arg.substr(2);
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std::string::size_type mark = arg.find('=');
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OptionFlag opt = find_option(arg.substr(0, mark));
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if(opt.takes_arg())
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{
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if(mark == std::string::npos)
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throw std::runtime_error("Option " + opt_name +
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" requires an argument");
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std::string name = arg.substr(0, mark);
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std::string value = arg.substr(mark+1);
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options[name] = value;
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}
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else
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{
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if(mark != std::string::npos)
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throw std::runtime_error("Option " + opt_name +
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" does not take an argument");
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options[arg] = "";
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}
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}
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else
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leftover.push_back(arg);
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}
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}
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OptionParser(const std::string& opt_string)
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{
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std::vector<std::string> opts = Botan::split_on(opt_string, '|');
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for(size_t j = 0; j != opts.size(); j++)
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flags.push_back(OptionFlag(opts[j]));
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}
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private:
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class OptionFlag
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{
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public:
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std::string name() const { return opt_name; }
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bool takes_arg() const { return opt_takes_arg; }
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OptionFlag(const std::string& opt_string)
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{
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std::string::size_type mark = opt_string.find('=');
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opt_name = opt_string.substr(0, mark);
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opt_takes_arg = (mark != std::string::npos);
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}
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private:
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std::string opt_name;
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bool opt_takes_arg;
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};
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OptionFlag find_option(const std::string& name) const
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{
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for(size_t j = 0; j != flags.size(); j++)
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if(flags[j].name() == name)
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return flags[j];
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throw std::runtime_error("Unknown option " + name);
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}
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std::vector<OptionFlag> flags;
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std::map<std::string, std::string> options;
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std::vector<std::string> leftover;
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};
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#endif
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