Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
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+/*=============================================================================
+    Copyright (c) 1998-2003 Joel de Guzman
+    Copyright (c) 2001 Daniel Nuffer
+    Copyright (c) 2002 Hartmut Kaiser
+    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_POSITIVE_HPP)
+#define BOOST_SPIRIT_POSITIVE_HPP
+
+#include <boost/spirit/home/classic/namespace.hpp>
+#include <boost/spirit/home/classic/core/parser.hpp>
+#include <boost/spirit/home/classic/core/primitives/primitives.hpp>
+#include <boost/spirit/home/classic/core/composite/composite.hpp>
+#include <boost/spirit/home/classic/meta/as_parser.hpp>
+
+namespace boost { namespace spirit {
+
+BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
+
+    ///////////////////////////////////////////////////////////////////////////
+    //
+    //  positive class
+    //
+    //      Handles expressions of the form:
+    //
+    //          +a
+    //
+    //      where a is a parser. The expression returns a composite
+    //      parser that matches its subject one (1) or more times.
+    //
+    ///////////////////////////////////////////////////////////////////////////
+    struct positive_parser_gen;
+    
+#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
+#pragma warning(push)
+#pragma warning(disable:4512) //assignment operator could not be generated
+#endif
+
+    template <typename S>
+    struct positive
+    :   public unary<S, parser<positive<S> > >
+    {
+        typedef positive<S>                 self_t;
+        typedef unary_parser_category       parser_category_t;
+        typedef positive_parser_gen         parser_generator_t;
+        typedef unary<S, parser<self_t> >   base_t;
+    
+        positive(S const& a)
+        : base_t(a) {}
+    
+        template <typename ScannerT>
+        typename parser_result<self_t, ScannerT>::type
+        parse(ScannerT const& scan) const
+        {
+            typedef typename parser_result<self_t, ScannerT>::type result_t;
+            typedef typename ScannerT::iterator_t iterator_t;
+            result_t hit = this->subject().parse(scan);
+    
+            if (hit)
+            {
+                for (;;)
+                {
+                    iterator_t save = scan.first;
+                    if (result_t next = this->subject().parse(scan))
+                    {
+                        scan.concat_match(hit, next);
+                    }
+                    else
+                    {
+                        scan.first = save;
+                        break;
+                    }
+                }
+            }
+            return hit;
+        }
+    };
+
+#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
+#pragma warning(pop)
+#endif
+    
+    struct positive_parser_gen
+    {
+        template <typename S>
+        struct result 
+        {
+            typedef positive<S> type;
+        };
+    
+        template <typename S>
+        static positive<S>
+        generate(parser<S> const& a)
+        {
+            return positive<S>(a.derived());
+        }
+    };
+    
+    template <typename S>
+    inline positive<S>
+    operator+(parser<S> const& a);
+
+BOOST_SPIRIT_CLASSIC_NAMESPACE_END
+
+}} // namespace BOOST_SPIRIT_CLASSIC_NS
+
+#endif
+
+#include <boost/spirit/home/classic/core/composite/impl/positive.ipp>