GNU Radio block for interfacing with various radio hardware
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gr-osmosdr/lib/arg_helpers.h

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/* -*- c++ -*- */
/*
* Copyright 2012 Dimitri Stolnikov <horiz0n@gmx.net>
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef OSMOSDR_ARG_HELPERS_H
#define OSMOSDR_ARG_HELPERS_H
#include <iostream>
#include <vector>
#include <map>
#include <gnuradio/io_signature.h>
#include <boost/lexical_cast.hpp>
#include <boost/tokenizer.hpp>
#include <ciso646>
typedef std::map< std::string, std::string > dict_t;
typedef std::pair< std::string, std::string > pair_t;
inline std::string dict_to_args_string( const dict_t &d )
{
std::string out;
for (const pair_t pair : d)
{
if (not out.empty()) out += ",";
out += pair.first + "='" + pair.second + "'";
}
return out;
}
inline std::vector< std::string > args_to_vector( const std::string &args )
{
std::vector< std::string > result;
boost::escaped_list_separator<char> separator("\\", " ", "'");
typedef boost::tokenizer< boost::escaped_list_separator<char> > tokenizer_t;
tokenizer_t tokens(args, separator);
for (std::string token : tokens)
result.push_back(token);
return result;
}
inline std::vector< std::string > params_to_vector( const std::string &params )
{
std::vector< std::string > result;
boost::escaped_list_separator<char> separator("\\", ",", "'");
typedef boost::tokenizer< boost::escaped_list_separator<char> > tokenizer_t;
tokenizer_t tokens(params, separator);
for (std::string token : tokens)
result.push_back(token);
return result;
}
inline pair_t param_to_pair( const std::string &param )
{
pair_t result;
std::size_t pos = param.find('=');
if(pos != std::string::npos)
{
result.first = param.substr(0, pos);
result.second = param.substr(pos + 1);
}
else
{
result.first = param;
result.second = "";
}
return result;
}
inline dict_t params_to_dict( const std::string &params )
{
dict_t result;
std::vector< std::string > param_list = params_to_vector( params );
for (std::string param : param_list)
{
pair_t pair = param_to_pair( param );
std::string value = pair.second;
if (value.length() && value[0] == '\'' && value[ value.length() - 1 ] == '\'')
value = value.substr(1, value.length() - 1);
result[ pair.first ] = value;
}
return result;
}
struct is_nchan_argument
{
bool operator ()(const std::string &str)
{
return str.find("numchan=") == 0;
}
};
inline gr::io_signature::sptr args_to_io_signature( const std::string &args )
{
size_t max_nchan = 0;
size_t dev_nchan = 0;
std::vector< std::string > arg_list = args_to_vector( args );
for (std::string arg : arg_list)
{
if ( arg.find( "numchan=" ) == 0 ) // try to parse global nchan value
{
pair_t pair = param_to_pair( arg );
max_nchan = boost::lexical_cast<size_t>( pair.second );
}
}
arg_list.erase( std::remove_if( // remove any global nchan tokens
arg_list.begin(),
arg_list.end(),
is_nchan_argument() ),
arg_list.end() );
// try to parse device specific nchan values, assume 1 channel if none given
for (std::string arg : arg_list)
{
dict_t dict = params_to_dict(arg);
if (dict.count("nchan"))
{
dev_nchan += boost::lexical_cast<size_t>( dict["nchan"] );
}
else // no channels given via args
{
dev_nchan++; // assume one channel
}
}
// if at least one nchan was given, perform a sanity check
if ( max_nchan && dev_nchan && max_nchan != dev_nchan )
throw std::runtime_error("Wrong device arguments specified. Missing nchan?");
const size_t nchan = std::max<size_t>(dev_nchan, 1); // assume at least one
return gr::io_signature::make(nchan, nchan, sizeof(gr_complex));
}
#endif // OSMOSDR_ARG_HELPERS_H