164 lines
4.8 KiB
C++
164 lines
4.8 KiB
C++
// (C) Copyright Gennadiy Rozental 2005-2008.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/test for the library home page.
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//
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// File : $RCSfile$
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//
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// Version : $Revision: 49312 $
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//
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// Description : default algorithms for string to specific type convertions
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// ***************************************************************************
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#ifndef BOOST_RT_INTERPRET_ARGUMENT_VALUE_HPP_062604GER
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#define BOOST_RT_INTERPRET_ARGUMENT_VALUE_HPP_062604GER
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// Boost.Runtime.Parameter
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#include <boost/test/utils/runtime/config.hpp>
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#include <boost/test/utils/runtime/trace.hpp>
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// Boost.Test
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#include <boost/test/utils/basic_cstring/io.hpp>
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#include <boost/test/utils/basic_cstring/compare.hpp>
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// Boost
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#include <boost/optional.hpp>
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#include <boost/lexical_cast.hpp>
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// STL
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// !! could we eliminate these includes?
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#include <list>
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namespace boost {
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namespace BOOST_RT_PARAM_NAMESPACE {
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// ************************************************************************** //
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// ************** runtime::interpret_argument_value ************** //
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// ************************************************************************** //
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// returns true if source is used false otherwise
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// generic case
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template<typename T>
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struct interpret_argument_value_impl {
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static bool _( cstring source, boost::optional<T>& res )
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{
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BOOST_RT_PARAM_TRACE( "In interpret_argument_value_impl<" << typeid(T).name() << ">" );
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res = lexical_cast<T>( source );
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BOOST_RT_PARAM_TRACE( "String " << source << " is interpreted as " << *res );
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return true;
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}
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};
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//____________________________________________________________________________//
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// dstring case
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template<>
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struct interpret_argument_value_impl<dstring> {
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static bool _( cstring source, boost::optional<dstring>& res )
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{
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BOOST_RT_PARAM_TRACE( "In interpret_argument_value_impl<dstring>" );
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res = dstring();
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assign_op( *res, source, 0 );
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return true;
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}
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};
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//____________________________________________________________________________//
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// cstring case
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template<>
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struct interpret_argument_value_impl<cstring> {
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static bool _( cstring source, boost::optional<cstring>& res )
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{
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BOOST_RT_PARAM_TRACE( "In interpret_argument_value_impl<cstring>" );
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res = source;
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return true;
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}
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};
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//____________________________________________________________________________//
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// specialization for type bool
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template<>
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struct interpret_argument_value_impl<bool> {
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static bool _( cstring source, boost::optional<bool>& res )
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{
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BOOST_RT_PARAM_TRACE( "In interpret_argument_value_impl<bool>" );
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static literal_cstring YES( BOOST_RT_PARAM_CSTRING_LITERAL( "YES" ) );
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static literal_cstring Y( BOOST_RT_PARAM_CSTRING_LITERAL( "Y" ) );
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static literal_cstring NO( BOOST_RT_PARAM_CSTRING_LITERAL( "NO" ) );
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static literal_cstring N( BOOST_RT_PARAM_CSTRING_LITERAL( "N" ) );
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static literal_cstring one( BOOST_RT_PARAM_CSTRING_LITERAL( "1" ) );
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static literal_cstring zero( BOOST_RT_PARAM_CSTRING_LITERAL( "0" ) );
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source.trim();
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if( case_ins_eq( source, YES ) || case_ins_eq( source, Y ) || case_ins_eq( source, one ) ) {
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res = true;
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return true;
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}
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else if( case_ins_eq( source, NO ) || case_ins_eq( source, N ) || case_ins_eq( source, zero ) ) {
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res = false;
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return true;
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}
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else {
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res = true;
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return false;
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}
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}
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};
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//____________________________________________________________________________//
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template<typename T>
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inline bool
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interpret_argument_value( cstring source, boost::optional<T>& res, long )
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{
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return interpret_argument_value_impl<T>::_( source, res );
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}
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//____________________________________________________________________________//
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// specialization for list of values
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template<typename T>
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inline bool
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interpret_argument_value( cstring source, boost::optional<std::list<T> >& res, int )
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{
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BOOST_RT_PARAM_TRACE( "In interpret_argument_value<std::list<T>>" );
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res = std::list<T>();
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while( !source.is_empty() ) {
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// !! should we use token_iterator
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cstring::iterator single_value_end = std::find( source.begin(), source.end(), BOOST_RT_PARAM_LITERAL( ',' ) );
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boost::optional<T> value;
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interpret_argument_value( cstring( source.begin(), single_value_end ), value, 0 );
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res->push_back( *value );
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source.trim_left( single_value_end + 1 );
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}
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return true;
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}
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//____________________________________________________________________________//
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} // namespace BOOST_RT_PARAM_NAMESPACE
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} // namespace boost
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#endif // BOOST_RT_INTERPRET_ARGUMENT_VALUE_HPP_062604GER
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