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// Copyright (C) 2012 Davis E. King ([email protected])
// License: Boost Software License See LICENSE.txt for the full license.
#ifndef DLIB_GET_OPTiON_Hh_
#define DLIB_GET_OPTiON_Hh_
#include "get_option_abstract.h"
#include "../string.h"
#include "../is_kind.h"
namespace dlib
{
// ----------------------------------------------------------------------------------------
class option_parse_error : public error
{
public:
option_parse_error(const std::string& option_string, const std::string& str):
error(EOPTION_PARSE,"Error parsing argument for option '" + option_string + "', offending string is '" + str + "'.") {}
};
// ----------------------------------------------------------------------------------------
template <typename config_reader_type, typename T>
T impl_config_reader_get_option (
const config_reader_type& cr,
const std::string& option_name,
const std::string& full_option_name,
T default_value
)
{
std::string::size_type pos = option_name.find_first_of(".");
if (pos == std::string::npos)
{
if (cr.is_key_defined(option_name))
{
try{ return string_cast<T>(cr[option_name]); }
catch (string_cast_error&) { throw option_parse_error(full_option_name, cr[option_name]); }
}
}
else
{
std::string block_name = option_name.substr(0,pos);
if (cr.is_block_defined(block_name))
{
return impl_config_reader_get_option(cr.block(block_name),
option_name.substr(pos+1),
full_option_name,
default_value);
}
}
return default_value;
}
// ----------------------------------------------------------------------------------------
template <typename cr_type, typename T>
typename enable_if<is_config_reader<cr_type>,T>::type get_option (
const cr_type& cr,
const std::string& option_name,
T default_value
)
{
return impl_config_reader_get_option(cr, option_name, option_name, default_value);
}
// ----------------------------------------------------------------------------------------
template <typename parser_type, typename T>
typename disable_if<is_config_reader<parser_type>,T>::type get_option (
const parser_type& parser,
const std::string& option_name,
T default_value
)
{
// make sure requires clause is not broken
DLIB_ASSERT( parser.option_is_defined(option_name) == true &&
parser.option(option_name).number_of_arguments() == 1,
"\t T get_option()"
<< "\n\t option_name: " << option_name
<< "\n\t parser.option_is_defined(option_name): " << parser.option_is_defined(option_name)
<< "\n\t parser.option(option_name).number_of_arguments(): " << parser.option(option_name).number_of_arguments()
);
if (parser.option(option_name))
{
try
{
default_value = string_cast<T>(parser.option(option_name).argument());
}
catch (string_cast_error&)
{
throw option_parse_error(option_name, parser.option(option_name).argument());
}
}
return default_value;
}
// ----------------------------------------------------------------------------------------
template <typename parser_type, typename cr_type, typename T>
typename disable_if<is_config_reader<parser_type>,T>::type get_option (
const parser_type& parser,
const cr_type& cr,
const std::string& option_name,
T default_value
)
{
// make sure requires clause is not broken
DLIB_ASSERT( parser.option_is_defined(option_name) == true &&
parser.option(option_name).number_of_arguments() == 1,
"\t T get_option()"
<< "\n\t option_name: " << option_name
<< "\n\t parser.option_is_defined(option_name): " << parser.option_is_defined(option_name)
<< "\n\t parser.option(option_name).number_of_arguments(): " << parser.option(option_name).number_of_arguments()
);
if (parser.option(option_name))
return get_option(parser, option_name, default_value);
else
return get_option(cr, option_name, default_value);
}
// ----------------------------------------------------------------------------------------
template <typename parser_type, typename cr_type, typename T>
typename disable_if<is_config_reader<parser_type>,T>::type get_option (
const cr_type& cr,
const parser_type& parser,
const std::string& option_name,
T default_value
)
{
// make sure requires clause is not broken
DLIB_ASSERT( parser.option_is_defined(option_name) == true &&
parser.option(option_name).number_of_arguments() == 1,
"\t T get_option()"
<< "\n\t option_name: " << option_name
<< "\n\t parser.option_is_defined(option_name): " << parser.option_is_defined(option_name)
<< "\n\t parser.option(option_name).number_of_arguments(): " << parser.option(option_name).number_of_arguments()
);
if (parser.option(option_name))
return get_option(parser, option_name, default_value);
else
return get_option(cr, option_name, default_value);
}
// ----------------------------------------------------------------------------------------
// ----------------------------------------------------------------------------------------
template <typename T>
inline std::string get_option (
const T& cr,
const std::string& option_name,
const char* default_value
)
{
return get_option(cr, option_name, std::string(default_value));
}
// ----------------------------------------------------------------------------------------
template <typename T, typename U>
inline std::string get_option (
const T& parser,
const U& cr,
const std::string& option_name,
const char* default_value
)
{
return get_option(parser, cr, option_name, std::string(default_value));
}
// ----------------------------------------------------------------------------------------
}
#endif // DLIB_GET_OPTiON_Hh_
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