parsers.hpp
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/*=============================================================================
Copyright (c) 2010-2011 Daniel James
Copyright (c) 2003 Martin Wille
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)
=============================================================================*/
// Some custom parsers for use in quickbook.
#ifndef BOOST_QUICKBOOK_PARSERS_HPP
#define BOOST_QUICKBOOK_PARSERS_HPP
#include <boost/spirit/include/classic_core.hpp>
#include <boost/spirit/include/classic_nil.hpp>
#include <boost/spirit/include/phoenix1_binders.hpp>
#include <boost/spirit/include/phoenix1_primitives.hpp>
#include <boost/spirit/include/phoenix1_tuples.hpp>
#include "fwd.hpp"
#include "iterator.hpp"
namespace quickbook
{
namespace cl = boost::spirit::classic;
///////////////////////////////////////////////////////////////////////////
//
// scoped_parser<Impl>
//
// Impl is a struct with the methods:
//
// void start();
// void success(parse_iterator, parse_iterator);
// void failure();
// void cleanup();
//
///////////////////////////////////////////////////////////////////////////
template <typename Impl, typename Arguments, typename ParserT>
struct scoped_parser_impl
: public cl::unary<
ParserT,
cl::parser<scoped_parser_impl<Impl, Arguments, ParserT> > >
{
typedef scoped_parser_impl<Impl, Arguments, ParserT> self_t;
typedef cl::unary<
ParserT,
cl::parser<scoped_parser_impl<Impl, Arguments, ParserT> > >
base_t;
template <typename ScannerT> struct result
{
typedef cl::match<> type;
};
scoped_parser_impl(
Impl const& impl, Arguments const& arguments, ParserT const& p)
: base_t(p), impl_(impl), arguments_(arguments)
{
}
struct scoped
{
explicit scoped(Impl const& impl) : impl_(impl), in_progress_(false)
{
}
typedef phoenix::tuple_index<0> t0;
typedef phoenix::tuple_index<1> t1;
bool start(phoenix::tuple<> const&)
{
in_progress_ = impl_.start();
return in_progress_;
}
template <typename Arg1> bool start(phoenix::tuple<Arg1> const& x)
{
in_progress_ =
phoenix::bind(&Impl::start)(phoenix::var(impl_), x[t0()])();
return in_progress_;
}
template <typename Arg1, typename Arg2>
bool start(phoenix::tuple<Arg1, Arg2> const& x)
{
in_progress_ = phoenix::bind(&Impl::start)(
phoenix::var(impl_), x[t0()], x[t1()])();
return in_progress_;
}
void success(parse_iterator f, parse_iterator l)
{
in_progress_ = false;
impl_.success(f, l);
}
void failure()
{
in_progress_ = false;
impl_.failure();
}
~scoped()
{
if (in_progress_) impl_.failure();
impl_.cleanup();
}
Impl impl_;
bool in_progress_;
};
template <typename ScannerT>
typename result<ScannerT>::type parse(ScannerT const& scan) const
{
typedef typename ScannerT::iterator_t iterator_t;
iterator_t save = scan.first;
scoped scope(impl_);
if (!scope.start(arguments_)) return scan.no_match();
typename cl::parser_result<ParserT, ScannerT>::type r =
this->subject().parse(scan);
bool success = scope.impl_.result(r, scan);
if (success) {
scope.success(save, scan.first);
if (r) {
return scan.create_match(
r.length(), cl::nil_t(), save, scan.first);
}
else {
return scan.create_match(
scan.first.base() - save.base(), cl::nil_t(), save,
scan.first);
}
}
else {
scope.failure();
return scan.no_match();
}
}
Impl impl_;
Arguments arguments_;
};
template <typename Impl, typename Arguments> struct scoped_parser_gen
{
explicit scoped_parser_gen(Impl impl, Arguments const& arguments)
: impl_(impl), arguments_(arguments)
{
}
template <typename ParserT>
scoped_parser_impl<
Impl,
Arguments,
typename cl::as_parser<ParserT>::type>
operator[](ParserT const& p) const
{
typedef cl::as_parser<ParserT> as_parser_t;
typedef typename as_parser_t::type parser_t;
return scoped_parser_impl<Impl, Arguments, parser_t>(
impl_, arguments_, p);
}
Impl impl_;
Arguments arguments_;
};
template <typename Impl> struct scoped_parser
{
scoped_parser(Impl const& impl) : impl_(impl) {}
scoped_parser_gen<Impl, phoenix::tuple<> > operator()() const
{
typedef phoenix::tuple<> tuple;
return scoped_parser_gen<Impl, tuple>(impl_, tuple());
}
template <typename Arg1>
scoped_parser_gen<Impl, phoenix::tuple<Arg1> > operator()(Arg1 x1) const
{
typedef phoenix::tuple<Arg1> tuple;
return scoped_parser_gen<Impl, tuple>(impl_, tuple(x1));
}
template <typename Arg1, typename Arg2>
scoped_parser_gen<Impl, phoenix::tuple<Arg1, Arg2> > operator()(
Arg1 x1, Arg2 x2) const
{
typedef phoenix::tuple<Arg1, Arg2> tuple;
return scoped_parser_gen<Impl, tuple>(impl_, tuple(x1, x2));
}
Impl impl_;
private:
scoped_parser& operator=(scoped_parser const&);
};
///////////////////////////////////////////////////////////////////////////
//
// Lookback parser
//
// usage: lookback[body]
//
// Requires that iterator has typedef 'lookback_range' and function
// 'lookback' returning a 'lookback_range'.
//
///////////////////////////////////////////////////////////////////////////
template <typename ParserT>
struct lookback_parser
: public cl::unary<ParserT, cl::parser<lookback_parser<ParserT> > >
{
typedef lookback_parser<ParserT> self_t;
typedef cl::unary<ParserT, cl::parser<lookback_parser<ParserT> > >
base_t;
template <typename ScannerT> struct result
{
typedef typename cl::parser_result<ParserT, ScannerT>::type type;
};
lookback_parser(ParserT const& p) : base_t(p) {}
template <typename ScannerT>
typename result<ScannerT>::type parse(ScannerT const& scan) const
{
typedef typename ScannerT::iterator_t::lookback_range::iterator
iterator_t;
typedef cl::scanner<iterator_t, typename ScannerT::policies_t>
scanner_t;
iterator_t begin = scan.first.lookback().begin();
scanner_t lookback_scan(begin, scan.first.lookback().end(), scan);
if (this->subject().parse(lookback_scan))
return scan.empty_match();
else
return scan.no_match();
}
};
struct lookback_gen
{
template <typename ParserT>
lookback_parser<ParserT> operator[](ParserT const& p) const
{
return lookback_parser<ParserT>(p);
}
};
lookback_gen const lookback = lookback_gen();
///////////////////////////////////////////////////////////////////////////
//
// UTF-8 code point
//
// Very crude, it doesn't check that the code point is in any way valid.
// Just looks for the beginning of the next character. This is just for
// implementing some crude fixes, rather than full unicode support. I'm
// sure experts would be appalled.
//
///////////////////////////////////////////////////////////////////////////
struct u8_codepoint_parser : public cl::parser<u8_codepoint_parser>
{
typedef u8_codepoint_parser self_t;
template <typename Scanner> struct result
{
typedef cl::match<> type;
};
template <typename Scanner>
typename result<Scanner>::type parse(Scanner const& scan) const
{
typedef typename Scanner::iterator_t iterator_t;
if (scan.at_end()) return scan.no_match();
iterator_t save(scan.first);
do {
++scan.first;
} while (!scan.at_end() &&
((unsigned char)*scan.first & 0xc0) == 0x80);
return scan.create_match(
scan.first.base() - save.base(), cl::nil_t(), save, scan.first);
}
};
u8_codepoint_parser const u8_codepoint_p = u8_codepoint_parser();
}
#endif // BOOST_QUICKBOOK_SCOPED_BLOCK_HPP