126 lines
3.7 KiB
C++
126 lines
3.7 KiB
C++
/*=============================================================================
|
|
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)
|
|
=============================================================================*/
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// This sample demontrates a parser for a comma separated list of identifiers
|
|
// This is a variation of stuff_vector.cpp.
|
|
// This is discussed in the "Phoenix" chapter in the Spirit User's Guide.
|
|
//
|
|
// [ JDG 1/12/2004 ]
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
#include <boost/spirit/include/classic_core.hpp>
|
|
#include <boost/spirit/include/classic_operators.hpp>
|
|
#include <boost/spirit/include/phoenix1_functions.hpp>
|
|
#include <boost/spirit/include/phoenix1_primitives.hpp>
|
|
#include <boost/spirit/include/phoenix1_casts.hpp>
|
|
#include <iostream>
|
|
#include <string>
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
using namespace std;
|
|
using namespace BOOST_SPIRIT_CLASSIC_NS;
|
|
using namespace phoenix;
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Our comma separated list parser
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
struct push_back_impl
|
|
{
|
|
template <typename Container, typename Item>
|
|
struct result
|
|
{
|
|
typedef void type;
|
|
};
|
|
|
|
template <typename Container, typename Item>
|
|
void operator()(Container& c, Item const& item) const
|
|
{
|
|
c.push_back(item);
|
|
}
|
|
};
|
|
|
|
function<push_back_impl> const push_back = push_back_impl();
|
|
|
|
bool
|
|
parse_identifiers(char const* str, vector<std::string>& v)
|
|
{
|
|
return parse(str,
|
|
|
|
// Begin grammar
|
|
(
|
|
(+alpha_p)
|
|
[
|
|
push_back(var(v), construct_<std::string>(arg1, arg2))
|
|
]
|
|
>>
|
|
*(',' >>
|
|
(+alpha_p)
|
|
[
|
|
push_back(var(v), construct_<std::string>(arg1, arg2))
|
|
]
|
|
)
|
|
)
|
|
,
|
|
// End grammar
|
|
|
|
space_p).full;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Main program
|
|
//
|
|
////////////////////////////////////////////////////////////////////////////
|
|
int
|
|
main()
|
|
{
|
|
cout << "/////////////////////////////////////////////////////////\n\n";
|
|
cout << "\t\tA comma separated list parser for Spirit...\n\n";
|
|
cout << "/////////////////////////////////////////////////////////\n\n";
|
|
|
|
cout << "Give me a comma separated list of identifiers.\n";
|
|
cout << "An identifier is comprised of one or more alphabetic characters.\n";
|
|
cout << "The identifiers 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;
|
|
|
|
vector<std::string> v;
|
|
if (parse_identifiers(str.c_str(), v))
|
|
{
|
|
cout << "-------------------------\n";
|
|
cout << "Parsing succeeded\n";
|
|
cout << str << " Parses OK: " << endl;
|
|
|
|
for (vector<std::string>::size_type i = 0; i < v.size(); ++i)
|
|
cout << i << ": " << v[i] << endl;
|
|
|
|
cout << "-------------------------\n";
|
|
}
|
|
else
|
|
{
|
|
cout << "-------------------------\n";
|
|
cout << "Parsing failed\n";
|
|
cout << "-------------------------\n";
|
|
}
|
|
}
|
|
|
|
cout << "Bye... :-) \n\n";
|
|
return 0;
|
|
}
|
|
|
|
|