104 lines
3.2 KiB
C++
104 lines
3.2 KiB
C++
// Copyright (c) 2001-2010 Hartmut Kaiser
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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///////////////////////////////////////////////////////////////////////////////
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//
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// A character classification example
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//
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// [ HK August 12, 2009 ] spirit2
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//
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///////////////////////////////////////////////////////////////////////////////
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#include <boost/config/warning_disable.hpp>
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#include <boost/spirit/include/qi.hpp>
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#include <boost/spirit/include/karma.hpp>
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#include <boost/spirit/include/phoenix_core.hpp>
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#include <boost/spirit/include/phoenix_operator.hpp>
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#include <boost/fusion/include/std_pair.hpp>
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#include <iostream>
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#include <string>
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#include <complex>
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namespace client
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{
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///////////////////////////////////////////////////////////////////////////
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// Our character classification generator
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///////////////////////////////////////////////////////////////////////////
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//[tutorial_karma_complex_number
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template <typename OutputIterator>
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bool classify_character(OutputIterator sink, char c)
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{
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using boost::spirit::ascii::char_;
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using boost::spirit::ascii::digit;
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using boost::spirit::ascii::xdigit;
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using boost::spirit::ascii::alpha;
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using boost::spirit::ascii::punct;
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using boost::spirit::ascii::space;
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using boost::spirit::ascii::cntrl;
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using boost::spirit::karma::omit;
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using boost::spirit::karma::generate;
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if (!boost::spirit::char_encoding::ascii::isascii_(c))
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return false;
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return generate(sink,
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// Begin grammar
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(
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"The character '" << char_ << "' is "
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<< ( &digit << "a digit"
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| &xdigit << "a xdigit"
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| &alpha << "a alpha"
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| &punct << "a punct"
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| &space << "a space"
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| &cntrl << "a cntrl"
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| "of unknown type"
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)
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),
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// End grammar
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c, c
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);
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}
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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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int main()
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{
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std::cout << "/////////////////////////////////////////////////////////\n\n";
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std::cout << "\t\tA character classification micro generator for Spirit...\n\n";
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std::cout << "/////////////////////////////////////////////////////////\n\n";
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std::cout << "Give me a character to classify\n";
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std::cout << "Type [q or Q] to quit\n\n";
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std::string str;
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while (getline(std::cin, str))
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{
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if (str.empty())
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break;
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std::string generated;
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std::back_insert_iterator<std::string> sink(generated);
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if (!client::classify_character(sink, str[0]))
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{
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std::cout << "-------------------------\n";
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std::cout << "Generating failed\n";
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std::cout << "-------------------------\n";
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}
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else
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{
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std::cout << generated << "\n";
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}
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}
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std::cout << "Bye... :-) \n\n";
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return 0;
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}
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