359 lines
10 KiB
C++
359 lines
10 KiB
C++
/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Copyright (c) 2001-2011 Hartmut Kaiser
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Copyright (c) 2010 Bryce Lelbach
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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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================================================_==============================*/
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#if !defined(BOOST_SPIRIT_STRING_TRAITS_OCTOBER_2008_1252PM)
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#define BOOST_SPIRIT_STRING_TRAITS_OCTOBER_2008_1252PM
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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/support/container.hpp>
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#include <string>
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/identity.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/proto/proto_fwd.hpp> // for BOOST_PROTO_DISABLE_IF_IS_CONST
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#include <boost/type_traits/is_const.hpp>
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#if defined(__GNUC__) && (__GNUC__ < 4)
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#include <boost/type_traits/add_const.hpp>
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#endif
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namespace boost { namespace spirit { namespace traits
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{
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///////////////////////////////////////////////////////////////////////////
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// Determine if T is a character type
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///////////////////////////////////////////////////////////////////////////
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template <typename T>
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struct is_char : mpl::false_ {};
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template <typename T>
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struct is_char<T const> : is_char<T> {};
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template <>
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struct is_char<char> : mpl::true_ {};
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template <>
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struct is_char<wchar_t> : mpl::true_ {};
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///////////////////////////////////////////////////////////////////////////
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// Determine if T is a string
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///////////////////////////////////////////////////////////////////////////
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template <typename T>
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struct is_string : mpl::false_ {};
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template <typename T>
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struct is_string<T const> : is_string<T> {};
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template <>
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struct is_string<char const*> : mpl::true_ {};
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template <>
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struct is_string<wchar_t const*> : mpl::true_ {};
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template <>
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struct is_string<char*> : mpl::true_ {};
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template <>
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struct is_string<wchar_t*> : mpl::true_ {};
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template <std::size_t N>
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struct is_string<char[N]> : mpl::true_ {};
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template <std::size_t N>
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struct is_string<wchar_t[N]> : mpl::true_ {};
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template <std::size_t N>
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struct is_string<char const[N]> : mpl::true_ {};
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template <std::size_t N>
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struct is_string<wchar_t const[N]> : mpl::true_ {};
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template <std::size_t N>
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struct is_string<char(&)[N]> : mpl::true_ {};
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template <std::size_t N>
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struct is_string<wchar_t(&)[N]> : mpl::true_ {};
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template <std::size_t N>
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struct is_string<char const(&)[N]> : mpl::true_ {};
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template <std::size_t N>
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struct is_string<wchar_t const(&)[N]> : mpl::true_ {};
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template <typename T, typename Traits, typename Allocator>
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struct is_string<std::basic_string<T, Traits, Allocator> > : mpl::true_ {};
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///////////////////////////////////////////////////////////////////////////
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// Get the underlying char type of a string
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///////////////////////////////////////////////////////////////////////////
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template <typename T>
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struct char_type_of;
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template <typename T>
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struct char_type_of<T const> : char_type_of<T> {};
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template <>
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struct char_type_of<char> : mpl::identity<char> {};
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template <>
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struct char_type_of<wchar_t> : mpl::identity<wchar_t> {};
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template <>
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struct char_type_of<char const*> : mpl::identity<char const> {};
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template <>
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struct char_type_of<wchar_t const*> : mpl::identity<wchar_t const> {};
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template <>
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struct char_type_of<char*> : mpl::identity<char> {};
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template <>
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struct char_type_of<wchar_t*> : mpl::identity<wchar_t> {};
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template <std::size_t N>
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struct char_type_of<char[N]> : mpl::identity<char> {};
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template <std::size_t N>
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struct char_type_of<wchar_t[N]> : mpl::identity<wchar_t> {};
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template <std::size_t N>
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struct char_type_of<char const[N]> : mpl::identity<char const> {};
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template <std::size_t N>
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struct char_type_of<wchar_t const[N]> : mpl::identity<wchar_t const> {};
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template <std::size_t N>
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struct char_type_of<char(&)[N]> : mpl::identity<char> {};
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template <std::size_t N>
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struct char_type_of<wchar_t(&)[N]> : mpl::identity<wchar_t> {};
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template <std::size_t N>
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struct char_type_of<char const(&)[N]> : mpl::identity<char const> {};
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template <std::size_t N>
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struct char_type_of<wchar_t const(&)[N]> : mpl::identity<wchar_t const> {};
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template <typename T, typename Traits, typename Allocator>
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struct char_type_of<std::basic_string<T, Traits, Allocator> >
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: mpl::identity<T> {};
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///////////////////////////////////////////////////////////////////////////
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// Get the C string from a string
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///////////////////////////////////////////////////////////////////////////
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template <typename String>
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struct extract_c_string;
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template <typename String>
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struct extract_c_string
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{
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typedef typename char_type_of<String>::type char_type;
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template <typename T>
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static T const* call (T* str)
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{
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return (T const*)str;
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}
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template <typename T>
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static T const* call (T const* str)
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{
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return str;
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}
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};
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// Forwarder that strips const
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template <typename T>
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struct extract_c_string<T const>
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{
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typedef typename extract_c_string<T>::char_type char_type;
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static typename extract_c_string<T>::char_type const* call (T const str)
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{
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return extract_c_string<T>::call(str);
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}
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};
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// Forwarder that strips references
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template <typename T>
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struct extract_c_string<T&>
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{
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typedef typename extract_c_string<T>::char_type char_type;
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static typename extract_c_string<T>::char_type const* call (T& str)
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{
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return extract_c_string<T>::call(str);
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}
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};
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// Forwarder that strips const references
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template <typename T>
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struct extract_c_string<T const&>
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{
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typedef typename extract_c_string<T>::char_type char_type;
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static typename extract_c_string<T>::char_type const* call (T const& str)
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{
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return extract_c_string<T>::call(str);
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}
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};
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template <typename T, typename Traits, typename Allocator>
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struct extract_c_string<std::basic_string<T, Traits, Allocator> >
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{
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typedef T char_type;
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typedef std::basic_string<T, Traits, Allocator> string;
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static T const* call (string const& str)
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{
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return str.c_str();
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}
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};
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template <typename T>
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typename extract_c_string<T*>::char_type const*
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get_c_string (T* str)
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{
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return extract_c_string<T*>::call(str);
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}
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template <typename T>
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typename extract_c_string<T const*>::char_type const*
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get_c_string (T const* str)
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{
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return extract_c_string<T const*>::call(str);
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}
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template <typename String>
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typename extract_c_string<String>::char_type const*
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get_c_string (String& str)
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{
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return extract_c_string<String>::call(str);
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}
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template <typename String>
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typename extract_c_string<String>::char_type const*
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get_c_string (String const& str)
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{
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return extract_c_string<String>::call(str);
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}
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///////////////////////////////////////////////////////////////////////////
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// Get the begin/end iterators from a string
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///////////////////////////////////////////////////////////////////////////
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// Implementation for C-style strings.
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// gcc 3.x.x has problems resolving ambiguities here
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#if defined(__GNUC__) && (__GNUC__ < 4)
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template <typename T>
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inline typename add_const<T>::type * get_begin(T* str) { return str; }
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template <typename T>
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inline typename add_const<T>::type* get_end(T* str)
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{
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T* last = str;
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while (*last)
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last++;
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return last;
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}
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#else
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template <typename T>
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inline T const* get_begin(T const* str) { return str; }
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template <typename T>
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inline T* get_begin(T* str) { return str; }
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template <typename T>
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inline T const* get_end(T const* str)
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{
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T const* last = str;
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while (*last)
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last++;
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return last;
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}
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template <typename T>
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inline T* get_end(T* str)
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{
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T* last = str;
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while (*last)
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last++;
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return last;
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}
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#endif
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// Implementation for containers (includes basic_string).
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template <typename T, typename Str>
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inline typename Str::const_iterator get_begin(Str const& str)
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{ return str.begin(); }
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template <typename T, typename Str>
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inline typename Str::iterator
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get_begin(Str& str BOOST_PROTO_DISABLE_IF_IS_CONST(Str))
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{ return str.begin(); }
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template <typename T, typename Str>
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inline typename Str::const_iterator get_end(Str const& str)
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{ return str.end(); }
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template <typename T, typename Str>
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inline typename Str::iterator
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get_end(Str& str BOOST_PROTO_DISABLE_IF_IS_CONST(Str))
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{ return str.end(); }
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// Default implementation for other types: try a C-style string
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// conversion.
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// These overloads are explicitly disabled for containers,
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// as they would be ambiguous with the previous ones.
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template <typename T, typename Str>
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inline typename disable_if<is_container<Str>
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, T const*>::type get_begin(Str const& str)
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{ return str; }
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template <typename T, typename Str>
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inline typename disable_if<is_container<Str>
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, T const*>::type get_end(Str const& str)
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{ return get_end(get_begin<T>(str)); }
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}
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namespace result_of
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{
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template <typename Char, typename T, typename Enable = void>
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struct get_begin
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{
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typedef typename traits::char_type_of<T>::type char_type;
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typedef typename mpl::if_<
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is_const<char_type>
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, char_type const
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, char_type
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>::type* type;
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};
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template <typename Char, typename Str>
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struct get_begin<Char, Str
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, typename enable_if<traits::is_container<Str> >::type>
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{
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typedef typename mpl::if_<
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is_const<Str>
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, typename Str::const_iterator
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, typename Str::iterator
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>::type type;
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};
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template <typename Char, typename T>
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struct get_end : get_begin<Char, T> {};
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}
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}}
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#endif
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