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/*=============================================================================
Copyright (c) 2002-2003 Joel de Guzman
http://spirit.sourceforge.net/
Use, modification and distribution is subject to the Boost Software
License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
///////////////////////////////////////////////////////////////////////////////
//
// Demonstrates use of boost::bind and spirit
// This is discussed in the "Functional" chapter in the Spirit User's Guide.
//
// [ JDG 9/29/2002 ]
//
///////////////////////////////////////////////////////////////////////////////
#include <boost/spirit/include/classic_core.hpp>
#include <boost/bind.hpp>
#include <iostream>
#include <vector>
#include <string>
///////////////////////////////////////////////////////////////////////////////
using namespace std;
using namespace BOOST_SPIRIT_CLASSIC_NS;
using namespace boost;
///////////////////////////////////////////////////////////////////////////////
//
// Our comma separated list parser
//
///////////////////////////////////////////////////////////////////////////////
class list_parser
{
public:
typedef list_parser self_t;
bool
parse(char const* str)
{
return BOOST_SPIRIT_CLASSIC_NS::parse(str,
// Begin grammar
(
real_p
[
bind(&self_t::add, this, _1)
]
>> *( ','
>> real_p
[
bind(&self_t::add, this, _1)
]
)
)
,
// End grammar
space_p).full;
}
void
add(double n)
{
v.push_back(n);
}
void
print() const
{
for (vector<double>::size_type i = 0; i < v.size(); ++i)
cout << i << ": " << v[i] << endl;
}
vector<double> v;
};
////////////////////////////////////////////////////////////////////////////
//
// Main program
//
////////////////////////////////////////////////////////////////////////////
int
main()
{
cout << "/////////////////////////////////////////////////////////\n\n";
cout << "\tA comma separated list parser for Spirit...\n";
cout << "\tDemonstrates use of boost::bind and spirit\n";
cout << "/////////////////////////////////////////////////////////\n\n";
cout << "Give me a comma separated list of numbers.\n";
cout << "The numbers will be inserted in a vector of numbers\n";
cout << "Type [q or Q] to quit\n\n";
string str;
while (getline(cin, str))
{
if (str.empty() || str[0] == 'q' || str[0] == 'Q')
break;
list_parser lp;
if (lp.parse(str.c_str()))
{
cout << "-------------------------\n";
cout << "Parsing succeeded\n";
cout << str << " Parses OK: " << endl;
lp.print();
cout << "-------------------------\n";
}
else
{
cout << "-------------------------\n";
cout << "Parsing failed\n";
cout << "-------------------------\n";
}
}
cout << "Bye... :-) \n\n";
return 0;
}
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