libs/spirit/example/techniques/multiple_scanners.cpp
/*=============================================================================
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)
=============================================================================*/
// *** See the section "Rule With Multiple Scanners" in
// *** chapter "Techniques" of the Spirit documentation
// *** for information regarding this snippet
#define BOOST_SPIRIT_RULE_SCANNERTYPE_LIMIT 3
#include <iostream>
#include <boost/spirit/core.hpp>
using namespace boost::spirit;
struct my_grammar : grammar<my_grammar>
{
template <typename ScannerT>
struct definition
{
definition(my_grammar const& self)
{
r = lower_p;
rr = +(lexeme_d[r] >> as_lower_d[r] >> r);
}
typedef scanner_list<
ScannerT
, typename lexeme_scanner<ScannerT>::type
, typename as_lower_scanner<ScannerT>::type
> scanners;
rule<scanners> r;
rule<ScannerT> rr;
rule<ScannerT> const& start() const { return rr; }
};
};
int
main()
{
my_grammar g;
bool success = parse("abcdef aBc d e f aBc d E f", g, space_p).full;
assert(success);
std::cout << "SUCCESS!!!\n";
return 0;
}