| /*============================================================================= |
| Copyright (c) 2001-2014 Joel de Guzman |
| Copyright (c) 2001-2011 Hartmut Kaiser |
| Copyright (c) 2010 Bryce Lelbach |
| |
| 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_X3_STRING_TRAITS_OCTOBER_2008_1252PM) |
| #define BOOST_SPIRIT_X3_STRING_TRAITS_OCTOBER_2008_1252PM |
| |
| #if defined(_MSC_VER) |
| #pragma once |
| #endif |
| |
| #include <string> |
| #include <boost/mpl/bool.hpp> |
| #include <boost/mpl/identity.hpp> |
| |
| namespace boost { namespace spirit { namespace x3 { namespace traits |
| { |
| /////////////////////////////////////////////////////////////////////////// |
| // Determine if T is a character type |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename T> |
| struct is_char : mpl::false_ {}; |
| |
| template <typename T> |
| struct is_char<T const> : is_char<T> {}; |
| |
| template <> |
| struct is_char<char> : mpl::true_ {}; |
| |
| template <> |
| struct is_char<wchar_t> : mpl::true_ {}; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // Determine if T is a string |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename T> |
| struct is_string : mpl::false_ {}; |
| |
| template <typename T> |
| struct is_string<T const> : is_string<T> {}; |
| |
| template <> |
| struct is_string<char const*> : mpl::true_ {}; |
| |
| template <> |
| struct is_string<wchar_t const*> : mpl::true_ {}; |
| |
| template <> |
| struct is_string<char*> : mpl::true_ {}; |
| |
| template <> |
| struct is_string<wchar_t*> : mpl::true_ {}; |
| |
| template <std::size_t N> |
| struct is_string<char[N]> : mpl::true_ {}; |
| |
| template <std::size_t N> |
| struct is_string<wchar_t[N]> : mpl::true_ {}; |
| |
| template <std::size_t N> |
| struct is_string<char const[N]> : mpl::true_ {}; |
| |
| template <std::size_t N> |
| struct is_string<wchar_t const[N]> : mpl::true_ {}; |
| |
| template <std::size_t N> |
| struct is_string<char(&)[N]> : mpl::true_ {}; |
| |
| template <std::size_t N> |
| struct is_string<wchar_t(&)[N]> : mpl::true_ {}; |
| |
| template <std::size_t N> |
| struct is_string<char const(&)[N]> : mpl::true_ {}; |
| |
| template <std::size_t N> |
| struct is_string<wchar_t const(&)[N]> : mpl::true_ {}; |
| |
| template <typename T, typename Traits, typename Allocator> |
| struct is_string<std::basic_string<T, Traits, Allocator> > : mpl::true_ {}; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // Get the underlying char type of a string |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename T> |
| struct char_type_of; |
| |
| template <typename T> |
| struct char_type_of<T const> : char_type_of<T> {}; |
| |
| template <> |
| struct char_type_of<char> : mpl::identity<char> {}; |
| |
| template <> |
| struct char_type_of<wchar_t> : mpl::identity<wchar_t> {}; |
| |
| template <> |
| struct char_type_of<char const*> : mpl::identity<char const> {}; |
| |
| template <> |
| struct char_type_of<wchar_t const*> : mpl::identity<wchar_t const> {}; |
| |
| template <> |
| struct char_type_of<char*> : mpl::identity<char> {}; |
| |
| template <> |
| struct char_type_of<wchar_t*> : mpl::identity<wchar_t> {}; |
| |
| template <std::size_t N> |
| struct char_type_of<char[N]> : mpl::identity<char> {}; |
| |
| template <std::size_t N> |
| struct char_type_of<wchar_t[N]> : mpl::identity<wchar_t> {}; |
| |
| template <std::size_t N> |
| struct char_type_of<char const[N]> : mpl::identity<char const> {}; |
| |
| template <std::size_t N> |
| struct char_type_of<wchar_t const[N]> : mpl::identity<wchar_t const> {}; |
| |
| template <std::size_t N> |
| struct char_type_of<char(&)[N]> : mpl::identity<char> {}; |
| |
| template <std::size_t N> |
| struct char_type_of<wchar_t(&)[N]> : mpl::identity<wchar_t> {}; |
| |
| template <std::size_t N> |
| struct char_type_of<char const(&)[N]> : mpl::identity<char const> {}; |
| |
| template <std::size_t N> |
| struct char_type_of<wchar_t const(&)[N]> : mpl::identity<wchar_t const> {}; |
| |
| template <typename T, typename Traits, typename Allocator> |
| struct char_type_of<std::basic_string<T, Traits, Allocator> > |
| : mpl::identity<T> {}; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // Get the C string from a string |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename String> |
| struct extract_c_string; |
| |
| template <typename String> |
| struct extract_c_string |
| { |
| typedef typename char_type_of<String>::type char_type; |
| |
| template <typename T> |
| static T const* call (T* str) |
| { |
| return (T const*)str; |
| } |
| |
| template <typename T> |
| static T const* call (T const* str) |
| { |
| return str; |
| } |
| }; |
| |
| // Forwarder that strips const |
| template <typename T> |
| struct extract_c_string<T const> |
| { |
| typedef typename extract_c_string<T>::char_type char_type; |
| |
| static typename extract_c_string<T>::char_type const* call (T const str) |
| { |
| return extract_c_string<T>::call(str); |
| } |
| }; |
| |
| // Forwarder that strips references |
| template <typename T> |
| struct extract_c_string<T&> |
| { |
| typedef typename extract_c_string<T>::char_type char_type; |
| |
| static typename extract_c_string<T>::char_type const* call (T& str) |
| { |
| return extract_c_string<T>::call(str); |
| } |
| }; |
| |
| // Forwarder that strips const references |
| template <typename T> |
| struct extract_c_string<T const&> |
| { |
| typedef typename extract_c_string<T>::char_type char_type; |
| |
| static typename extract_c_string<T>::char_type const* call (T const& str) |
| { |
| return extract_c_string<T>::call(str); |
| } |
| }; |
| |
| template <typename T, typename Traits, typename Allocator> |
| struct extract_c_string<std::basic_string<T, Traits, Allocator> > |
| { |
| typedef T char_type; |
| |
| typedef std::basic_string<T, Traits, Allocator> string; |
| |
| static T const* call (string const& str) |
| { |
| return str.c_str(); |
| } |
| }; |
| |
| template <typename T> |
| typename extract_c_string<T*>::char_type const* |
| get_c_string(T* str) |
| { |
| return extract_c_string<T*>::call(str); |
| } |
| |
| template <typename T> |
| typename extract_c_string<T const*>::char_type const* |
| get_c_string(T const* str) |
| { |
| return extract_c_string<T const*>::call(str); |
| } |
| |
| template <typename String> |
| typename extract_c_string<String>::char_type const* |
| get_c_string(String& str) |
| { |
| return extract_c_string<String>::call(str); |
| } |
| |
| template <typename String> |
| typename extract_c_string<String>::char_type const* |
| get_c_string(String const& str) |
| { |
| return extract_c_string<String>::call(str); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // Get the begin/end iterators from a string |
| /////////////////////////////////////////////////////////////////////////// |
| |
| // Implementation for C-style strings. |
| |
| template <typename T> |
| inline T const* get_string_begin(T const* str) { return str; } |
| |
| template <typename T> |
| inline T* get_string_begin(T* str) { return str; } |
| |
| template <typename T> |
| inline T const* get_string_end(T const* str) |
| { |
| T const* last = str; |
| while (*last) |
| last++; |
| return last; |
| } |
| |
| template <typename T> |
| inline T* get_string_end(T* str) |
| { |
| T* last = str; |
| while (*last) |
| last++; |
| return last; |
| } |
| |
| // Implementation for containers (includes basic_string). |
| template <typename T, typename Str> |
| inline typename Str::const_iterator get_string_begin(Str const& str) |
| { return str.begin(); } |
| |
| template <typename T, typename Str> |
| inline typename Str::iterator |
| get_string_begin(Str& str) |
| { return str.begin(); } |
| |
| template <typename T, typename Str> |
| inline typename Str::const_iterator get_string_end(Str const& str) |
| { return str.end(); } |
| |
| template <typename T, typename Str> |
| inline typename Str::iterator |
| get_string_end(Str& str) |
| { return str.end(); } |
| }}}} |
| |
| #endif |