132 lines
4.9 KiB
C++
132 lines
4.9 KiB
C++
// Copyright (c) 2001-2011 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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#if !defined(BOOST_SPIRIT_KARMA_DETAIL_GENERATE_FEB_20_2007_0959AM)
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#define BOOST_SPIRIT_KARMA_DETAIL_GENERATE_FEB_20_2007_0959AM
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/spirit/home/karma/meta_compiler.hpp>
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#include <boost/spirit/home/karma/delimit_out.hpp>
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#include <boost/spirit/home/karma/delimit_flag.hpp>
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#include <boost/spirit/home/karma/detail/output_iterator.hpp>
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#include <boost/spirit/home/support/unused.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/mpl/bool.hpp>
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namespace boost { namespace spirit { namespace karma { namespace detail
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{
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///////////////////////////////////////////////////////////////////////////
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template <typename Expr, typename Enable = void>
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struct generate_impl
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{
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// Report invalid expression error as early as possible.
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// If you got an error_invalid_expression error message here,
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// then the expression (Expr) is not a valid spirit karma expression.
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// Did you intend to use the auto_ facilities while forgetting to
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// #include <boost/spirit/include/karma_auto.hpp>?
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BOOST_SPIRIT_ASSERT_MATCH(karma::domain, Expr);
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};
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template <typename Expr>
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struct generate_impl<Expr
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, typename enable_if<traits::matches<karma::domain, Expr> >::type>
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{
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template <typename OutputIterator>
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static bool call(
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OutputIterator& target_sink
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, Expr const& expr)
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{
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typedef traits::properties_of<
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typename result_of::compile<karma::domain, Expr>::type
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> properties;
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// wrap user supplied iterator into our own output iterator
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output_iterator<OutputIterator
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, mpl::int_<properties::value> > sink(target_sink);
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return compile<karma::domain>(expr).
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generate(sink, unused, unused, unused);
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}
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template <typename OutputIterator, typename Properties>
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static bool call(
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detail::output_iterator<OutputIterator, Properties>& sink
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, Expr const& expr)
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{
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return compile<karma::domain>(expr).
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generate(sink, unused, unused, unused);
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}
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};
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///////////////////////////////////////////////////////////////////////////
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template <typename Expr, typename Enable = void>
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struct generate_delimited_impl
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{
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// Report invalid expression error as early as possible.
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// If you got an error_invalid_expression error message here,
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// then the expression (Expr) is not a valid spirit karma expression.
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// Did you intend to use the auto_ facilities while forgetting to
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// #include <boost/spirit/include/karma_auto.hpp>?
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BOOST_SPIRIT_ASSERT_MATCH(karma::domain, Expr);
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};
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template <typename Expr>
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struct generate_delimited_impl<Expr
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, typename enable_if<traits::matches<karma::domain, Expr> >::type>
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{
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template <typename OutputIterator, typename Delimiter>
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static bool call(
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OutputIterator& target_sink
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, Expr const& expr
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, Delimiter const& delimiter
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, BOOST_SCOPED_ENUM(delimit_flag) pre_delimit)
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{
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typedef traits::properties_of<
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typename result_of::compile<karma::domain, Expr>::type
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> properties;
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typedef traits::properties_of<
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typename result_of::compile<karma::domain, Delimiter>::type
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> delimiter_properties;
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// wrap user supplied iterator into our own output iterator
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detail::output_iterator<OutputIterator
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, mpl::int_<properties::value | delimiter_properties::value>
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> sink(target_sink);
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return call(sink, expr, delimiter, pre_delimit);
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}
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template <typename OutputIterator, typename Properties
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, typename Delimiter>
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static bool call(
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detail::output_iterator<OutputIterator, Properties>& sink
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, Expr const& expr
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, Delimiter const& delimiter
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, BOOST_SCOPED_ENUM(delimit_flag) pre_delimit)
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{
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// Report invalid expression error as early as possible.
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// If you got an error_invalid_expression error message here,
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// then the delimiter is not a valid spirit karma expression.
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BOOST_SPIRIT_ASSERT_MATCH(karma::domain, Delimiter);
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typename result_of::compile<karma::domain, Delimiter>::type const
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delimiter_ = compile<karma::domain>(delimiter);
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if (pre_delimit == delimit_flag::predelimit &&
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!karma::delimit_out(sink, delimiter_))
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{
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return false;
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}
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return compile<karma::domain>(expr).
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generate(sink, unused, delimiter_, unused);
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}
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};
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}}}}
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#endif
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