Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
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+/*=============================================================================
+    Copyright (c) 2002-2003 Joel de Guzman
+    Copyright (c) 2002-2003 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_AS_PARSER_HPP)
+#define BOOST_SPIRIT_AS_PARSER_HPP
+
+#include <boost/spirit/home/classic/namespace.hpp>
+#include <boost/spirit/home/classic/core/primitives/primitives.hpp>
+
+namespace boost { namespace spirit {
+
+BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
+
+    ///////////////////////////////////////////////////////////////////////////
+    //
+    //  Helper templates to derive the parser type from an auxilliary type
+    //  and to generate an object of the required parser type given an
+    //  auxilliary object. Supported types to convert are parsers,
+    //  single characters and character strings.
+    //
+    ///////////////////////////////////////////////////////////////////////////
+    namespace impl
+    {
+        template<typename T>
+        struct default_as_parser
+        {
+            typedef T type;
+            static type const& convert(type const& p)
+            {
+                return p;
+            }
+        };
+
+        struct char_as_parser
+        {
+            typedef chlit<char> type;
+            static type convert(char ch)
+            {
+                return type(ch);
+            }
+        };
+
+        struct wchar_as_parser
+        {
+            typedef chlit<wchar_t> type;
+            static type convert(wchar_t ch)
+            {
+                return type(ch);
+            }
+        };
+
+        struct string_as_parser
+        {
+            typedef strlit<char const*> type;
+            static type convert(char const* str)
+            {
+                return type(str);
+            }
+        };
+
+        struct wstring_as_parser
+        {
+            typedef strlit<wchar_t const*> type;
+            static type convert(wchar_t const* str)
+            {
+                return type(str);
+            }
+        };
+    }
+
+    template<typename T>
+    struct as_parser : impl::default_as_parser<T> {};
+
+    template<>
+    struct as_parser<char> : impl::char_as_parser {};
+
+    template<>
+    struct as_parser<wchar_t> : impl::wchar_as_parser {};
+
+    template<>
+    struct as_parser<char*> : impl::string_as_parser {};
+
+    template<>
+    struct as_parser<char const*> : impl::string_as_parser {};
+
+    template<>
+    struct as_parser<wchar_t*> : impl::wstring_as_parser {};
+
+    template<>
+    struct as_parser<wchar_t const*> : impl::wstring_as_parser {};
+
+    template<int N>
+    struct as_parser<char[N]> : impl::string_as_parser {};
+
+    template<int N>
+    struct as_parser<wchar_t[N]> : impl::wstring_as_parser {};
+
+    template<int N>
+    struct as_parser<char const[N]> : impl::string_as_parser {};
+
+    template<int N>
+    struct as_parser<wchar_t const[N]> : impl::wstring_as_parser {};
+
+BOOST_SPIRIT_CLASSIC_NAMESPACE_END
+
+}} // namespace BOOST_SPIRIT_CLASSIC_NS
+
+#endif