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/*
* (C) 2015,2017 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_CLI_ARGPARSE_H_
#define BOTAN_CLI_ARGPARSE_H_
#include <string>
#include <map>
#include <set>
#include <vector>
#include <botan/parsing.h>
#include "cli_exceptions.h"
namespace Botan_CLI {
class Argument_Parser final
{
public:
Argument_Parser(const std::string& spec,
const std::vector<std::string>& extra_flags = {},
const std::vector<std::string>& extra_opts = {});
void parse_args(const std::vector<std::string>& params);
bool flag_set(const std::string& flag) const;
bool has_arg(const std::string& opt_name) const;
std::string get_arg(const std::string& option) const;
std::string get_arg_or(const std::string& option, const std::string& otherwise) const;
size_t get_arg_sz(const std::string& option) const;
std::vector<std::string> get_arg_list(const std::string& what) const;
private:
// set in constructor
std::vector<std::string> m_spec_args;
std::set<std::string> m_spec_flags;
std::map<std::string, std::string> m_spec_opts;
std::string m_spec_rest;
// set in parse_args()
std::map<std::string, std::string> m_user_args;
std::set<std::string> m_user_flags;
std::vector<std::string> m_user_rest;
};
bool Argument_Parser::flag_set(const std::string& flag_name) const
{
return m_user_flags.count(flag_name) > 0;
}
bool Argument_Parser::has_arg(const std::string& opt_name) const
{
return m_user_args.count(opt_name) > 0;
}
std::string Argument_Parser::get_arg(const std::string& opt_name) const
{
auto i = m_user_args.find(opt_name);
if(i == m_user_args.end())
{
// this shouldn't occur unless you passed the wrong thing to get_arg
throw CLI_Error("Unknown option " + opt_name + " used (program bug)");
}
return i->second;
}
std::string Argument_Parser::get_arg_or(const std::string& opt_name, const std::string& otherwise) const
{
auto i = m_user_args.find(opt_name);
if(i == m_user_args.end() || i->second.empty())
{
return otherwise;
}
return i->second;
}
size_t Argument_Parser::get_arg_sz(const std::string& opt_name) const
{
const std::string s = get_arg(opt_name);
try
{
return static_cast<size_t>(std::stoul(s));
}
catch(std::exception&)
{
throw CLI_Usage_Error("Invalid integer value '" + s + "' for option " + opt_name);
}
}
std::vector<std::string> Argument_Parser::get_arg_list(const std::string& what) const
{
if(what == m_spec_rest)
return m_user_rest;
return Botan::split_on(get_arg(what), ',');
}
void Argument_Parser::parse_args(const std::vector<std::string>& params)
{
std::vector<std::string> args;
for(auto const& param : params)
{
if(param.find("--") == 0)
{
// option
const auto eq = param.find('=');
if(eq == std::string::npos)
{
const std::string opt_name = param.substr(2, std::string::npos);
if(m_spec_flags.count(opt_name) == 0)
{
if(m_spec_opts.count(opt_name))
{
throw CLI_Usage_Error("Invalid usage of option --" + opt_name +
" without value");
}
else
{
throw CLI_Usage_Error("Unknown flag --" + opt_name);
}
}
m_user_flags.insert(opt_name);
}
else
{
const std::string opt_name = param.substr(2, eq - 2);
const std::string opt_val = param.substr(eq + 1, std::string::npos);
if(m_spec_opts.count(opt_name) == 0)
{
throw CLI_Usage_Error("Unknown option --" + opt_name);
}
m_user_args.insert(std::make_pair(opt_name, opt_val));
}
}
else
{
// argument
args.push_back(param);
}
}
if(flag_set("help"))
return;
if(args.size() < m_spec_args.size())
{
// not enough arguments
throw CLI_Usage_Error("Invalid argument count, got " +
std::to_string(args.size()) +
" expected " +
std::to_string(m_spec_args.size()));
}
bool seen_stdin_flag = false;
size_t arg_i = 0;
for(auto const& arg : m_spec_args)
{
m_user_args.insert(std::make_pair(arg, args[arg_i]));
if(args[arg_i] == "-")
{
if(seen_stdin_flag)
{
throw CLI_Usage_Error("Cannot specify '-' (stdin) more than once");
}
seen_stdin_flag = true;
}
++arg_i;
}
if(m_spec_rest.empty())
{
if(arg_i != args.size())
{
throw CLI_Usage_Error("Too many arguments");
}
}
else
{
m_user_rest.assign(args.begin() + arg_i, args.end());
}
// Now insert any defaults for options not supplied by the user
for(auto const& opt : m_spec_opts)
{
if(m_user_args.count(opt.first) == 0)
{
m_user_args.insert(opt);
}
}
}
Argument_Parser::Argument_Parser(const std::string& spec,
const std::vector<std::string>& extra_flags,
const std::vector<std::string>& extra_opts)
{
class CLI_Error_Invalid_Spec final : public CLI_Error
{
public:
explicit CLI_Error_Invalid_Spec(const std::string& bad_spec)
: CLI_Error("Invalid command spec '" + bad_spec + "'") {}
};
const std::vector<std::string> parts = Botan::split_on(spec, ' ');
if(parts.size() == 0)
{
throw CLI_Error_Invalid_Spec(spec);
}
for(size_t i = 1; i != parts.size(); ++i)
{
const std::string s = parts[i];
if(s.empty()) // ?!? (shouldn't happen)
{
throw CLI_Error_Invalid_Spec(spec);
}
if(s.size() > 2 && s[0] == '-' && s[1] == '-')
{
// option or flag
auto eq = s.find('=');
if(eq == std::string::npos)
{
m_spec_flags.insert(s.substr(2, std::string::npos));
}
else
{
m_spec_opts.insert(std::make_pair(s.substr(2, eq - 2), s.substr(eq + 1, std::string::npos)));
}
}
else if(s[0] == '*')
{
// rest argument
if(m_spec_rest.empty() && s.size() > 2)
{
m_spec_rest = s.substr(1, std::string::npos);
}
else
{
throw CLI_Error_Invalid_Spec(spec);
}
}
else
{
// named argument
if(!m_spec_rest.empty()) // rest arg wasn't last
{
throw CLI_Error_Invalid_Spec(spec);
}
m_spec_args.push_back(s);
}
}
for(std::string flag : extra_flags)
m_spec_flags.insert(flag);
for(std::string opt : extra_opts)
m_spec_opts.insert(std::make_pair(opt, ""));
}
}
#endif
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