236 lines
7.5 KiB
C++
236 lines
7.5 KiB
C++
// filesystem path_traits.hpp --------------------------------------------------------//
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// Copyright Beman Dawes 2009
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// Distributed under the Boost Software License, Version 1.0.
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// See http://www.boost.org/LICENSE_1_0.txt
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// Library home page: http://www.boost.org/libs/filesystem
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#ifndef BOOST_FILESYSTEM_PATH_TRAITS_HPP
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#define BOOST_FILESYSTEM_PATH_TRAITS_HPP
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#include <boost/config.hpp>
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# if defined( BOOST_NO_STD_WSTRING )
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# error Configuration not supported: Boost.Filesystem V3 and later requires std::wstring support
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# endif
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#include <boost/filesystem/config.hpp>
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#include <boost/utility/enable_if.hpp>
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#include <boost/type_traits/is_array.hpp>
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#include <boost/type_traits/decay.hpp>
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#include <boost/system/error_code.hpp>
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#include <cwchar> // for mbstate_t
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#include <string>
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#include <vector>
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#include <list>
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#include <iterator>
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#include <locale>
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#include <boost/assert.hpp>
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// #include <iostream> //**** comment me out ****
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#include <boost/config/abi_prefix.hpp> // must be the last #include
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namespace boost { namespace filesystem {
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BOOST_FILESYSTEM_DECL const system::error_category& codecvt_error_category();
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// uses std::codecvt_base::result used for error codes:
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//
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// ok: Conversion successful.
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// partial: Not all source characters converted; one or more additional source
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// characters are needed to produce the final target character, or the
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// size of the target intermediate buffer was too small to hold the result.
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// error: A character in the source could not be converted to the target encoding.
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// noconv: The source and target characters have the same type and encoding, so no
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// conversion was necessary.
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class directory_entry;
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namespace path_traits {
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typedef std::codecvt<wchar_t, char, std::mbstate_t> codecvt_type;
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// is_pathable type trait; allows disabling over-agressive class path member templates
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template <class T>
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struct is_pathable { static const bool value = false; };
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template<> struct is_pathable<char*> { static const bool value = true; };
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template<> struct is_pathable<const char*> { static const bool value = true; };
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template<> struct is_pathable<wchar_t*> { static const bool value = true; };
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template<> struct is_pathable<const wchar_t*> { static const bool value = true; };
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template<> struct is_pathable<std::string> { static const bool value = true; };
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template<> struct is_pathable<std::wstring> { static const bool value = true; };
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template<> struct is_pathable<std::vector<char> > { static const bool value = true; };
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template<> struct is_pathable<std::vector<wchar_t> > { static const bool value = true; };
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template<> struct is_pathable<std::list<char> > { static const bool value = true; };
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template<> struct is_pathable<std::list<wchar_t> > { static const bool value = true; };
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template<> struct is_pathable<directory_entry> { static const bool value = true; };
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// Pathable empty
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template <class Container> inline
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// disable_if aids broken compilers (IBM, old GCC, etc.) and is harmless for
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// conforming compilers. Replace by plain "bool" at some future date (2012?)
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typename boost::disable_if<boost::is_array<Container>, bool>::type
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empty(const Container & c)
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{ return c.begin() == c.end(); }
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template <class T> inline
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bool empty(T * const & c_str)
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{
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BOOST_ASSERT(c_str);
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return !*c_str;
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}
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template <typename T, size_t N> inline
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bool empty(T (&x)[N])
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{ return !x[0]; }
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// value types differ ---------------------------------------------------------------//
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//
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// A from_end argument of 0 is less efficient than a known end, so use only if needed
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BOOST_FILESYSTEM_DECL
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void convert(const char* from,
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const char* from_end, // 0 for null terminated MBCS
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std::wstring & to,
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const codecvt_type& cvt);
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BOOST_FILESYSTEM_DECL
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void convert(const wchar_t* from,
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const wchar_t* from_end, // 0 for null terminated MBCS
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std::string & to,
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const codecvt_type& cvt);
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inline
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void convert(const char* from,
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std::wstring & to,
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const codecvt_type& cvt)
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{
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BOOST_ASSERT(from);
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convert(from, 0, to, cvt);
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}
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inline
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void convert(const wchar_t* from,
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std::string & to,
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const codecvt_type& cvt)
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{
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BOOST_ASSERT(from);
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convert(from, 0, to, cvt);
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}
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// value types same -----------------------------------------------------------------//
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// char
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inline
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void convert(const char* from, const char* from_end, std::string & to,
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const codecvt_type&)
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{
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BOOST_ASSERT(from);
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BOOST_ASSERT(from_end);
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to.append(from, from_end);
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}
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inline
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void convert(const char* from,
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std::string & to,
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const codecvt_type&)
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{
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BOOST_ASSERT(from);
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to += from;
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}
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// wchar_t
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inline
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void convert(const wchar_t* from, const wchar_t* from_end, std::wstring & to,
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const codecvt_type&)
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{
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BOOST_ASSERT(from);
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BOOST_ASSERT(from_end);
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to.append(from, from_end);
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}
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inline
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void convert(const wchar_t* from,
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std::wstring & to,
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const codecvt_type&)
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{
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BOOST_ASSERT(from);
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to += from;
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}
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// Source dispatch -----------------------------------------------------------------//
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// contiguous containers
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template <class U> inline
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void dispatch(const std::string& c, U& to, const codecvt_type& cvt)
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{
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if (c.size())
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convert(&*c.begin(), &*c.begin() + c.size(), to, cvt);
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}
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template <class U> inline
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void dispatch(const std::wstring& c, U& to, const codecvt_type& cvt)
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{
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if (c.size())
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convert(&*c.begin(), &*c.begin() + c.size(), to, cvt);
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}
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template <class U> inline
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void dispatch(const std::vector<char>& c, U& to, const codecvt_type& cvt)
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{
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if (c.size())
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convert(&*c.begin(), &*c.begin() + c.size(), to, cvt);
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}
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template <class U> inline
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void dispatch(const std::vector<wchar_t>& c, U& to, const codecvt_type& cvt)
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{
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if (c.size())
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convert(&*c.begin(), &*c.begin() + c.size(), to, cvt);
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}
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// non-contiguous containers
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template <class Container, class U> inline
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// disable_if aids broken compilers (IBM, old GCC, etc.) and is harmless for
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// conforming compilers. Replace by plain "void" at some future date (2012?)
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typename boost::disable_if<boost::is_array<Container>, void>::type
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dispatch(const Container & c, U& to, const codecvt_type& cvt)
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{
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if (c.size())
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{
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std::basic_string<typename Container::value_type> s(c.begin(), c.end());
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convert(s.c_str(), s.c_str()+s.size(), to, cvt);
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}
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}
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// c_str
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template <class T, class U> inline
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void dispatch(T * const & c_str, U& to, const codecvt_type& cvt)
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{
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// std::cout << "dispatch() const T *\n";
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BOOST_ASSERT(c_str);
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convert(c_str, to, cvt);
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}
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// Note: there is no dispatch on C-style arrays because the array may
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// contain a string smaller than the array size.
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BOOST_FILESYSTEM_DECL
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void dispatch(const directory_entry & de,
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# ifdef BOOST_WINDOWS_API
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std::wstring & to,
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# else
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std::string & to,
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# endif
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const codecvt_type&);
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}}} // namespace boost::filesystem::path_traits
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#include <boost/config/abi_suffix.hpp> // pops abi_prefix.hpp pragmas
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#endif // BOOST_FILESYSTEM_PATH_TRAITS_HPP
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