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Filename : match_manip.hpp
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/*=============================================================================
    Copyright (c) 2001-2011 Hartmut Kaiser

    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_MATCH_MANIP_MAY_05_2007_1203PM)
#define BOOST_SPIRIT_MATCH_MANIP_MAY_05_2007_1203PM

#if defined(_MSC_VER)
#pragma once
#endif

#include <boost/spirit/home/qi/parse.hpp>
#include <boost/spirit/home/support/iterators/istream_iterator.hpp>
#include <boost/spirit/home/support/unused.hpp>
#include <boost/mpl/bool.hpp>

#include <iterator>
#include <string>

///////////////////////////////////////////////////////////////////////////////
namespace boost { namespace spirit { namespace qi { namespace detail
{
    ///////////////////////////////////////////////////////////////////////////
    template <typename Expr
      , typename CopyExpr = mpl::false_, typename CopyAttr = mpl::false_
      , typename Skipper = unused_type, typename Attribute = unused_type const>
    struct match_manip
    {
        // This assertion makes sure we don't hit the only code path which is 
        // not implemented (because it isn't needed), where both, the 
        // expression and the attribute need to be held as a copy.
        BOOST_SPIRIT_ASSERT_MSG(!CopyExpr::value || !CopyAttr::value
            , error_invalid_should_not_happen, ());

        match_manip(Expr const& xpr, Skipper const& s, Attribute& a)
          : expr(xpr), skipper(s), attr(a), post_skip(skip_flag::postskip) {}

        match_manip(Expr const& xpr, Skipper const& s
            , BOOST_SCOPED_ENUM(skip_flag) ps, Attribute& a)
          : expr(xpr), skipper(s), attr(a), post_skip(ps) {}

        Expr const& expr;
        Skipper const& skipper;
        Attribute& attr;
        BOOST_SCOPED_ENUM(skip_flag) const post_skip;

        // silence MSVC warning C4512: assignment operator could not be generated
        BOOST_DELETED_FUNCTION(match_manip& operator= (match_manip const&))
    };

    template <typename Expr, typename Skipper, typename Attribute>
    struct match_manip<Expr, mpl::false_, mpl::true_, Skipper, Attribute>
    {
        match_manip(Expr const& xpr, Skipper const& s, Attribute& a)
          : expr(xpr), skipper(s), attr(a), post_skip(skip_flag::postskip) {}

        match_manip(Expr const& xpr, Skipper const& s
            , BOOST_SCOPED_ENUM(skip_flag) ps, Attribute& a)
          : expr(xpr), skipper(s), attr(a), post_skip(ps) {}

        Expr const& expr;
        Skipper const& skipper;
        Attribute attr;
        BOOST_SCOPED_ENUM(skip_flag) const post_skip;

        // silence MSVC warning C4512: assignment operator could not be generated
        BOOST_DELETED_FUNCTION(match_manip& operator= (match_manip const&))
    };

    template <typename Expr, typename Skipper, typename Attribute>
    struct match_manip<Expr, mpl::true_, mpl::false_, Skipper, Attribute>
    {
        match_manip(Expr const& xpr, Skipper const& s, Attribute& a)
          : expr(xpr), skipper(s), attr(a), post_skip(skip_flag::postskip) {}

        match_manip(Expr const& xpr, Skipper const& s
            , BOOST_SCOPED_ENUM(skip_flag) ps, Attribute& a)
          : expr(xpr), skipper(s), attr(a), post_skip(ps) {}

        Expr expr;
        Skipper const& skipper;
        Attribute& attr;
        BOOST_SCOPED_ENUM(skip_flag) const post_skip;

        // silence MSVC warning C4512: assignment operator could not be generated
        BOOST_DELETED_FUNCTION(match_manip& operator= (match_manip const&))
    };

    ///////////////////////////////////////////////////////////////////////////
    template <typename Expr, typename Enable = void>
    struct match
    {
        // Report invalid expression error as early as possible.
        // If you got an error_invalid_expression error message here,
        // then the expression (expr) is not a valid spirit qi expression.
        // Did you intend to use the auto_ facilities while forgetting to 
        // #include <boost/spirit/include/qi_match_auto.hpp>?
        BOOST_SPIRIT_ASSERT_MATCH(qi::domain, Expr);
    };

    template <typename Expr>
    struct match<Expr
      , typename enable_if<traits::matches<qi::domain, Expr> >::type>
    {
        typedef match_manip<Expr> type;

        static type call(Expr const& expr)
        {
            return type(expr, unused, unused);
        }
    };

    ///////////////////////////////////////////////////////////////////////////
    template <typename Expr, typename Skipper, typename Enable = void>
    struct phrase_match
    {
        // Report invalid expression error as early as possible.
        // If you got an error_invalid_expression error message here,
        // then the expression (expr) is not a valid spirit qi expression.
        // Did you intend to use the auto_ facilities while forgetting to 
        // #include <boost/spirit/include/qi_match_auto.hpp>?
        BOOST_SPIRIT_ASSERT_MATCH(qi::domain, Expr);
    };

    template <typename Expr, typename Skipper>
    struct phrase_match<Expr, Skipper
      , typename enable_if<traits::matches<qi::domain, Expr> >::type>
    {
        typedef match_manip<Expr, mpl::false_, mpl::false_, Skipper> type;

        static type call(
            Expr const& expr
          , Skipper const& skipper
          , BOOST_SCOPED_ENUM(skip_flag) post_skip)
        {
            // Report invalid expression error as early as possible.
            // If you got an error_invalid_expression error message here,
            // then the delimiter is not a valid spirit karma expression.
            BOOST_SPIRIT_ASSERT_MATCH(qi::domain, Skipper);
            return type(expr, skipper, post_skip, unused);
        }
    };

    ///////////////////////////////////////////////////////////////////////////
    template<typename Char, typename Traits, typename Expr
      , typename CopyExpr, typename CopyAttr>
    inline std::basic_istream<Char, Traits> &
    operator>>(std::basic_istream<Char, Traits> &is,
        match_manip<Expr, CopyExpr, CopyAttr> const& fm)
    {
        typedef spirit::basic_istream_iterator<Char, Traits> input_iterator;

        input_iterator f(is);
        input_iterator l;
        if (!qi::parse(f, l, fm.expr))
        {
            is.setstate(std::ios_base::failbit);
        }
        return is;
    }

    ///////////////////////////////////////////////////////////////////////////
    template<typename Char, typename Traits, typename Expr
      , typename CopyExpr, typename CopyAttr
      , typename Attribute>
    inline std::basic_istream<Char, Traits> &
    operator>>(std::basic_istream<Char, Traits> &is,
        match_manip<Expr, CopyExpr, CopyAttr, unused_type, Attribute> const& fm)
    {
        typedef spirit::basic_istream_iterator<Char, Traits> input_iterator;

        input_iterator f(is);
        input_iterator l;
        if (!qi::parse(f, l, fm.expr, fm.attr))
        {
            is.setstate(std::ios_base::failbit);
        }
        return is;
    }

    ///////////////////////////////////////////////////////////////////////////
    template<typename Char, typename Traits, typename Expr
      , typename CopyExpr, typename CopyAttr
      , typename Skipper>
    inline std::basic_istream<Char, Traits> &
    operator>>(std::basic_istream<Char, Traits> &is,
        match_manip<Expr, CopyExpr, CopyAttr, Skipper> const& fm)
    {
        typedef spirit::basic_istream_iterator<Char, Traits> input_iterator;

        input_iterator f(is);
        input_iterator l;
        if (!qi::phrase_parse(
                f, l, fm.expr, fm.skipper, fm.post_skip))
        {
            is.setstate(std::ios_base::failbit);
        }
        return is;
    }

    ///////////////////////////////////////////////////////////////////////////
    template<typename Char, typename Traits, typename Expr
      , typename CopyExpr, typename CopyAttr
      , typename Attribute, typename Skipper
    >
    inline std::basic_istream<Char, Traits> &
    operator>>(
        std::basic_istream<Char, Traits> &is,
        match_manip<Expr, CopyExpr, CopyAttr, Attribute, Skipper> const& fm)
    {
        typedef spirit::basic_istream_iterator<Char, Traits> input_iterator;

        input_iterator f(is);
        input_iterator l;
        if (!qi::phrase_parse(
                f, l, fm.expr, fm.skipper, fm.post_skip, fm.attr))
        {
            is.setstate(std::ios_base::failbit);
        }
        return is;
    }

}}}}

#endif