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