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358 lines
10 KiB
358 lines
10 KiB
/*============================================================================= |
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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> |
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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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