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/*=============================================================================
Copyright (c) 1998-2003 Joel de Guzman
http://spirit.sourceforge.net/
Distributed under 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)
=============================================================================*/
#if !defined(BOOST_SPIRIT_SKIPPER_HPP)
#define BOOST_SPIRIT_SKIPPER_HPP
///////////////////////////////////////////////////////////////////////////////
#include <cctype>
#include <boost/spirit/home/classic/namespace.hpp>
#include <boost/spirit/home/classic/core/scanner/scanner.hpp>
#include <boost/spirit/home/classic/core/primitives/impl/primitives.ipp>
#include <boost/spirit/home/classic/core/scanner/skipper_fwd.hpp>
namespace boost { namespace spirit {
BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
///////////////////////////////////////////////////////////////////////////
//
// skipper_iteration_policy class
//
///////////////////////////////////////////////////////////////////////////
template <typename BaseT>
struct skipper_iteration_policy : public BaseT
{
typedef BaseT base_t;
skipper_iteration_policy()
: BaseT() {}
template <typename PolicyT>
skipper_iteration_policy(PolicyT const& other)
: BaseT(other) {}
template <typename ScannerT>
void
advance(ScannerT const& scan) const
{
BaseT::advance(scan);
scan.skip(scan);
}
template <typename ScannerT>
bool
at_end(ScannerT const& scan) const
{
scan.skip(scan);
return BaseT::at_end(scan);
}
template <typename ScannerT>
void
skip(ScannerT const& scan) const
{
while (!BaseT::at_end(scan) && impl::isspace_(BaseT::get(scan)))
BaseT::advance(scan);
}
};
///////////////////////////////////////////////////////////////////////////
//
// no_skipper_iteration_policy class
//
///////////////////////////////////////////////////////////////////////////
template <typename BaseT>
struct no_skipper_iteration_policy : public BaseT
{
typedef BaseT base_t;
no_skipper_iteration_policy()
: BaseT() {}
template <typename PolicyT>
no_skipper_iteration_policy(PolicyT const& other)
: BaseT(other) {}
template <typename ScannerT>
void
skip(ScannerT const& /*scan*/) const {}
};
///////////////////////////////////////////////////////////////////////////
//
// skip_parser_iteration_policy class
//
///////////////////////////////////////////////////////////////////////////
namespace impl
{
template <typename ST, typename ScannerT, typename BaseT>
void
skipper_skip(
ST const& s,
ScannerT const& scan,
skipper_iteration_policy<BaseT> const&);
template <typename ST, typename ScannerT, typename BaseT>
void
skipper_skip(
ST const& s,
ScannerT const& scan,
no_skipper_iteration_policy<BaseT> const&);
template <typename ST, typename ScannerT>
void
skipper_skip(
ST const& s,
ScannerT const& scan,
iteration_policy const&);
}
template <typename ParserT, typename BaseT>
class skip_parser_iteration_policy : public skipper_iteration_policy<BaseT>
{
public:
typedef skipper_iteration_policy<BaseT> base_t;
skip_parser_iteration_policy(
ParserT const& skip_parser,
base_t const& base = base_t())
: base_t(base), subject(skip_parser) {}
template <typename PolicyT>
skip_parser_iteration_policy(PolicyT const& other)
: base_t(other), subject(other.skipper()) {}
template <typename ScannerT>
void
skip(ScannerT const& scan) const
{
impl::skipper_skip(subject, scan, scan);
}
ParserT const&
skipper() const
{
return subject;
}
private:
ParserT const& subject;
};
///////////////////////////////////////////////////////////////////////////////
//
// Free parse functions using the skippers
//
///////////////////////////////////////////////////////////////////////////////
template <typename IteratorT, typename ParserT, typename SkipT>
parse_info<IteratorT>
parse(
IteratorT const& first,
IteratorT const& last,
parser<ParserT> const& p,
parser<SkipT> const& skip);
///////////////////////////////////////////////////////////////////////////////
//
// Parse function for null terminated strings using the skippers
//
///////////////////////////////////////////////////////////////////////////////
template <typename CharT, typename ParserT, typename SkipT>
parse_info<CharT const*>
parse(
CharT const* str,
parser<ParserT> const& p,
parser<SkipT> const& skip);
///////////////////////////////////////////////////////////////////////////////
//
// phrase_scanner_t and wide_phrase_scanner_t
//
// The most common scanners. Use these typedefs when you need
// a scanner that skips white spaces.
//
///////////////////////////////////////////////////////////////////////////////
typedef skipper_iteration_policy<> iter_policy_t;
typedef scanner_policies<iter_policy_t> scanner_policies_t;
typedef scanner<char const*, scanner_policies_t> phrase_scanner_t;
typedef scanner<wchar_t const*, scanner_policies_t> wide_phrase_scanner_t;
///////////////////////////////////////////////////////////////////////////////
BOOST_SPIRIT_CLASSIC_NAMESPACE_END
}} // namespace BOOST_SPIRIT_CLASSIC_NS
#include <boost/spirit/home/classic/core/scanner/impl/skipper.ipp>
#endif
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Swift