comparison DEPENDENCIES/generic/include/boost/spirit/home/karma/directive/omit.hpp @ 16:2665513ce2d3

Add boost headers

+//  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(SPIRIT_KARMA_OMIT_JUL_20_2009_1008AM)
+#define SPIRIT_KARMA_OMIT_JUL_20_2009_1008AM
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/spirit/home/karma/meta_compiler.hpp>
+#include <boost/spirit/home/karma/generator.hpp>
+#include <boost/spirit/home/karma/domain.hpp>
+#include <boost/spirit/home/support/unused.hpp>
+#include <boost/spirit/home/support/info.hpp>
+#include <boost/spirit/home/support/common_terminals.hpp>
+#include <boost/spirit/home/support/has_semantic_action.hpp>
+#include <boost/spirit/home/support/handles_container.hpp>
+#include <boost/spirit/home/karma/detail/attributes.hpp>
+
+namespace boost { namespace spirit
+{
+    ///////////////////////////////////////////////////////////////////////////
+    // Enablers
+    ///////////////////////////////////////////////////////////////////////////
+    template <>
+    struct use_directive<karma::domain, tag::omit> // enables omit
+      : mpl::true_ {};
+
+    template <>
+    struct use_directive<karma::domain, tag::skip> // enables skip
+      : mpl::true_ {};
+}}
+
+namespace boost { namespace spirit { namespace karma
+{
+#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
+    using spirit::omit;
+    using spirit::skip;
+#endif
+    using spirit::omit_type;
+    using spirit::skip_type;
+
+    ///////////////////////////////////////////////////////////////////////////
+    // omit_directive consumes the attribute of subject generator without
+    // generating anything
+    ///////////////////////////////////////////////////////////////////////////
+    template <typename Subject, bool Execute>
+    struct omit_directive : unary_generator<omit_directive<Subject, Execute> >
+    {
+        typedef Subject subject_type;
+
+        typedef mpl::int_<
+            generator_properties::disabling | subject_type::properties::value
+        > properties;
+
+        omit_directive(Subject const& subject)
+          : subject(subject) {}
+
+        template <typename Context, typename Iterator = unused_type>
+        struct attribute
+          : traits::attribute_of<subject_type, Context, Iterator>
+        {};
+
+        template <typename OutputIterator, typename Context, typename Delimiter
+          , typename Attribute>
+        bool generate(OutputIterator& sink, Context& ctx, Delimiter const& d
+          , Attribute const& attr) const
+        {
+            // We need to actually compile the output operation as we don't 
+            // have any other means to verify, whether the passed attribute is 
+            // compatible with the subject. 
+
+            // omit[] will execute the code, while skip[] doesn't execute it
+            if (Execute) {
+                // wrap the given output iterator to avoid output
+                detail::disable_output<OutputIterator> disable(sink);
+                return subject.generate(sink, ctx, d, attr);
+            }
+            return true;
+        }
+
+        template <typename Context>
+        info what(Context& context) const
+        {
+            return info(Execute ? "omit" : "skip", subject.what(context));
+        }
+
+        Subject subject;
+    };
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Generator generators: make_xxx function (objects)
+    ///////////////////////////////////////////////////////////////////////////
+    template <typename Subject, typename Modifiers>
+    struct make_directive<tag::omit, Subject, Modifiers>
+    {
+        typedef omit_directive<Subject, true> result_type;
+        result_type operator()(unused_type, Subject const& subject
+          , unused_type) const
+        {
+            return result_type(subject);
+        }
+    };
+
+    template <typename Subject, typename Modifiers>
+    struct make_directive<tag::skip, Subject, Modifiers>
+    {
+        typedef omit_directive<Subject, false> result_type;
+        result_type operator()(unused_type, Subject const& subject
+          , unused_type) const
+        {
+            return result_type(subject);
+        }
+    };
+}}}
+
+namespace boost { namespace spirit { namespace traits
+{
+    ///////////////////////////////////////////////////////////////////////////
+    template <typename Subject, bool Execute>
+    struct has_semantic_action<karma::omit_directive<Subject, Execute> >
+      : unary_has_semantic_action<Subject> {};
+
+    ///////////////////////////////////////////////////////////////////////////
+    template <typename Subject, bool Execute, typename Attribute
+        , typename Context, typename Iterator>
+    struct handles_container<karma::omit_directive<Subject, Execute>, Attribute
+        , Context, Iterator>
+      : unary_handles_container<Subject, Attribute, Context, Iterator> {};
+}}}
+
+#endif