boost/filesystem/path.hpp
// filesystem path.hpp ---------------------------------------------------------------// // Copyright Beman Dawes 2002-2005, 2009 // Copyright Vladimir Prus 2002 // Distributed under the Boost Software License, Version 1.0. // See http://www.boost.org/LICENSE_1_0.txt // Library home page: http://www.boost.org/libs/filesystem // path::stem(), extension(), and replace_extension() are based on // basename(), extension(), and change_extension() from the original // filesystem/convenience.hpp header by Vladimir Prus. #ifndef BOOST_FILESYSTEM_PATH_HPP #define BOOST_FILESYSTEM_PATH_HPP #include <boost/config.hpp> # if defined( BOOST_NO_STD_WSTRING ) # error Configuration not supported: Boost.Filesystem V3 and later requires std::wstring support # endif #include <boost/filesystem/config.hpp> #include <boost/filesystem/path_traits.hpp> // includes <cwchar> #include <boost/system/error_code.hpp> #include <boost/system/system_error.hpp> #include <boost/iterator/iterator_facade.hpp> #include <boost/shared_ptr.hpp> #include <boost/io/detail/quoted_manip.hpp> #include <boost/static_assert.hpp> #include <boost/functional/hash_fwd.hpp> #include <boost/type_traits/is_integral.hpp> #include <string> #include <iterator> #include <cstring> #include <iosfwd> #include <stdexcept> #include <cassert> #include <locale> #include <algorithm> #include <boost/config/abi_prefix.hpp> // must be the last #include namespace boost { namespace filesystem { //------------------------------------------------------------------------------------// // // // class path // // // //------------------------------------------------------------------------------------// class BOOST_FILESYSTEM_DECL path { public: // value_type is the character type used by the operating system API to // represent paths. # ifdef BOOST_WINDOWS_API typedef wchar_t value_type; BOOST_STATIC_CONSTEXPR value_type preferred_separator = L'\\'; # else typedef char value_type; BOOST_STATIC_CONSTEXPR value_type preferred_separator = '/'; # endif typedef std::basic_string<value_type> string_type; typedef std::codecvt<wchar_t, char, std::mbstate_t> codecvt_type; // ----- character encoding conversions ----- // Following the principle of least astonishment, path input arguments // passed to or obtained from the operating system via objects of // class path behave as if they were directly passed to or // obtained from the O/S API, unless conversion is explicitly requested. // // POSIX specfies that path strings are passed unchanged to and from the // API. Note that this is different from the POSIX command line utilities, // which convert according to a locale. // // Thus for POSIX, char strings do not undergo conversion. wchar_t strings // are converted to/from char using the path locale or, if a conversion // argument is given, using a conversion object modeled on // std::wstring_convert. // // The path locale, which is global to the thread, can be changed by the // imbue() function. It is initialized to an implementation defined locale. // // For Windows, wchar_t strings do not undergo conversion. char strings // are converted using the "ANSI" or "OEM" code pages, as determined by // the AreFileApisANSI() function, or, if a conversion argument is given, // using a conversion object modeled on std::wstring_convert. // // See m_pathname comments for further important rationale. // TODO: rules needed for operating systems that use / or . // differently, or format directory paths differently from file paths. // // ********************************************************************************** // // More work needed: How to handle an operating system that may have // slash characters or dot characters in valid filenames, either because // it doesn't follow the POSIX standard, or because it allows MBCS // filename encodings that may contain slash or dot characters. For // example, ISO/IEC 2022 (JIS) encoding which allows switching to // JIS x0208-1983 encoding. A valid filename in this set of encodings is // 0x1B 0x24 0x42 [switch to X0208-1983] 0x24 0x2F [U+304F Kiragana letter KU] // ^^^^ // Note that 0x2F is the ASCII slash character // // ********************************************************************************** // Supported source arguments: half-open iterator range, container, c-array, // and single pointer to null terminated string. // All source arguments except pointers to null terminated byte strings support // multi-byte character strings which may have embedded nulls. Embedded null // support is required for some Asian languages on Windows. // [defaults] "const codecvt_type& cvt=codecvt()" default arguments are not used // because some compilers, such as Microsoft prior to VC++ 10, do not handle defaults // correctly in templates. // ----- constructors ----- path(){} path(const path& p) : m_pathname(p.m_pathname) {} template <class Source> path(Source const& source, typename boost::enable_if<path_traits::is_pathable< typename boost::decay<Source>::type> >::type* =0) { path_traits::dispatch(source, m_pathname, codecvt()); } // Overloads for the operating system API's native character type. Rationale: // - Avoids use of codecvt() for native value_type strings. This limits the // impact of locale("") initialization failures on POSIX systems to programs // that actually depend on locale(""). It further ensures that exceptions thrown // as a result of such failues occur after main() has started, so can be caught. // This is a partial resolution of tickets 4688, 5100, and 5289. // - A slight optimization for a common use case, particularly on POSIX since // value_type is char and that is the most common useage. path(const value_type* s) : m_pathname(s) {} path(const std::basic_string<value_type>& s) : m_pathname(s) {} template <class Source> path(Source const& source, const codecvt_type& cvt) // see [defaults] note above explaining why codecvt() default arguments are not used { path_traits::dispatch(source, m_pathname, cvt); } template <class InputIterator> path(InputIterator begin, InputIterator end) { if (begin != end) { std::basic_string<typename std::iterator_traits<InputIterator>::value_type> s(begin, end); path_traits::convert(s.c_str(), s.c_str()+s.size(), m_pathname, codecvt()); } } template <class InputIterator> path(InputIterator begin, InputIterator end, const codecvt_type& cvt) { if (begin != end) { std::basic_string<typename std::iterator_traits<InputIterator>::value_type> s(begin, end); path_traits::convert(s.c_str(), s.c_str()+s.size(), m_pathname, cvt); } } // ----- assignments ----- path& operator=(const path& p) { m_pathname = p.m_pathname; return *this; } path& operator=(const value_type* ptr) // required in case ptr overlaps *this { m_pathname = ptr; return *this; } template <class Source> typename boost::enable_if<path_traits::is_pathable< typename boost::decay<Source>::type>, path&>::type operator=(Source const& source) { m_pathname.clear(); path_traits::dispatch(source, m_pathname, codecvt()); return *this; } path& assign(const value_type* ptr, const codecvt_type&) // required in case ptr overlaps *this { m_pathname = ptr; return *this; } template <class Source> path& assign(Source const& source, const codecvt_type& cvt) { m_pathname.clear(); path_traits::dispatch(source, m_pathname, cvt); return *this; } template <class InputIterator> path& assign(InputIterator begin, InputIterator end) { return assign(begin, end, codecvt()); } template <class InputIterator> path& assign(InputIterator begin, InputIterator end, const codecvt_type& cvt) { m_pathname.clear(); if (begin != end) { std::basic_string<typename std::iterator_traits<InputIterator>::value_type> s(begin, end); path_traits::convert(s.c_str(), s.c_str()+s.size(), m_pathname, cvt); } return *this; } // ----- concatenation ----- path& operator+=(const path& p) {m_pathname += p.m_pathname; return *this;} path& operator+=(const string_type& s) {m_pathname += s; return *this;} path& operator+=(const value_type* ptr) {m_pathname += ptr; return *this;} path& operator+=(value_type c) {m_pathname += c; return *this;} template <class Source> typename boost::enable_if<path_traits::is_pathable< typename boost::decay<Source>::type>, path&>::type operator+=(Source const& source) { return concat(source, codecvt()); } template <class CharT> typename boost::enable_if<is_integral<CharT>, path&>::type operator+=(CharT c) { CharT tmp[2]; tmp[0] = c; tmp[1] = 0; return concat(tmp, codecvt()); } template <class Source> path& concat(Source const& source, const codecvt_type& cvt) { path_traits::dispatch(source, m_pathname, cvt); return *this; } template <class InputIterator> path& concat(InputIterator begin, InputIterator end) { return concat(begin, end, codecvt()); } template <class InputIterator> path& concat(InputIterator begin, InputIterator end, const codecvt_type& cvt) { if (begin == end) return *this; std::basic_string<typename std::iterator_traits<InputIterator>::value_type> s(begin, end); path_traits::convert(s.c_str(), s.c_str()+s.size(), m_pathname, cvt); return *this; } // ----- appends ----- // if a separator is added, it is the preferred separator for the platform; // slash for POSIX, backslash for Windows path& operator/=(const path& p); path& operator/=(const value_type* ptr); template <class Source> typename boost::enable_if<path_traits::is_pathable< typename boost::decay<Source>::type>, path&>::type operator/=(Source const& source) { return append(source, codecvt()); } path& append(const value_type* ptr, const codecvt_type&) // required in case ptr overlaps *this { this->operator/=(ptr); return *this; } template <class Source> path& append(Source const& source, const codecvt_type& cvt); template <class InputIterator> path& append(InputIterator begin, InputIterator end) { return append(begin, end, codecvt()); } template <class InputIterator> path& append(InputIterator begin, InputIterator end, const codecvt_type& cvt); // ----- modifiers ----- void clear() { m_pathname.clear(); } path& make_preferred() # ifdef BOOST_POSIX_API { return *this; } // POSIX no effect # else // BOOST_WINDOWS_API ; // change slashes to backslashes # endif path& remove_filename(); path& replace_extension(const path& new_extension = path()); void swap(path& rhs) { m_pathname.swap(rhs.m_pathname); } // ----- observers ----- // For operating systems that format file paths differently than directory // paths, return values from observers are formatted as file names unless there // is a trailing separator, in which case returns are formatted as directory // paths. POSIX and Windows make no such distinction. // Implementations are permitted to return const values or const references. // The string or path returned by an observer are specified as being formatted // as "native" or "generic". // // For POSIX, these are all the same format; slashes and backslashes are as input and // are not modified. // // For Windows, native: as input; slashes and backslashes are not modified; // this is the format of the internally stored string. // generic: backslashes are converted to slashes // ----- native format observers ----- const string_type& native() const { return m_pathname; } // Throws: nothing const value_type* c_str() const { return m_pathname.c_str(); } // Throws: nothing template <class String> String string() const; template <class String> String string(const codecvt_type& cvt) const; # ifdef BOOST_WINDOWS_API const std::string string() const { return string(codecvt()); } const std::string string(const codecvt_type& cvt) const { std::string tmp; if (!m_pathname.empty()) path_traits::convert(&*m_pathname.begin(), &*m_pathname.begin()+m_pathname.size(), tmp, cvt); return tmp; } // string_type is std::wstring, so there is no conversion const std::wstring& wstring() const { return m_pathname; } const std::wstring& wstring(const codecvt_type&) const { return m_pathname; } # else // BOOST_POSIX_API // string_type is std::string, so there is no conversion const std::string& string() const { return m_pathname; } const std::string& string(const codecvt_type&) const { return m_pathname; } const std::wstring wstring() const { return wstring(codecvt()); } const std::wstring wstring(const codecvt_type& cvt) const { std::wstring tmp; if (!m_pathname.empty()) path_traits::convert(&*m_pathname.begin(), &*m_pathname.begin()+m_pathname.size(), tmp, cvt); return tmp; } # endif // ----- generic format observers ----- template <class String> String generic_string() const; template <class String> String generic_string(const codecvt_type& cvt) const; # ifdef BOOST_WINDOWS_API const std::string generic_string() const { return generic_string(codecvt()); } const std::string generic_string(const codecvt_type& cvt) const; const std::wstring generic_wstring() const; const std::wstring generic_wstring(const codecvt_type&) const { return generic_wstring(); }; # else // BOOST_POSIX_API // On POSIX-like systems, the generic format is the same as the native format const std::string& generic_string() const { return m_pathname; } const std::string& generic_string(const codecvt_type&) const { return m_pathname; } const std::wstring generic_wstring() const { return wstring(codecvt()); } const std::wstring generic_wstring(const codecvt_type& cvt) const { return wstring(cvt); } # endif // ----- compare ----- int compare(const path& p) const BOOST_NOEXCEPT; // generic, lexicographical int compare(const std::string& s) const { return compare(path(s)); } int compare(const value_type* s) const { return compare(path(s)); } // ----- decomposition ----- path root_path() const; path root_name() const; // returns 0 or 1 element path // even on POSIX, root_name() is non-empty() for network paths path root_directory() const; // returns 0 or 1 element path path relative_path() const; path parent_path() const; path filename() const; // returns 0 or 1 element path path stem() const; // returns 0 or 1 element path path extension() const; // returns 0 or 1 element path // ----- query ----- bool empty() const { return m_pathname.empty(); } // name consistent with std containers bool has_root_path() const { return has_root_directory() || has_root_name(); } bool has_root_name() const { return !root_name().empty(); } bool has_root_directory() const { return !root_directory().empty(); } bool has_relative_path() const { return !relative_path().empty(); } bool has_parent_path() const { return !parent_path().empty(); } bool has_filename() const { return !m_pathname.empty(); } bool has_stem() const { return !stem().empty(); } bool has_extension() const { return !extension().empty(); } bool is_absolute() const { # ifdef BOOST_WINDOWS_API return has_root_name() && has_root_directory(); # else return has_root_directory(); # endif } bool is_relative() const { return !is_absolute(); } // ----- iterators ----- class iterator; typedef iterator const_iterator; iterator begin() const; iterator end() const; // ----- static member functions ----- static std::locale imbue(const std::locale& loc); static const codecvt_type& codecvt(); // ----- deprecated functions ----- # if defined(BOOST_FILESYSTEM_DEPRECATED) && defined(BOOST_FILESYSTEM_NO_DEPRECATED) # error both BOOST_FILESYSTEM_DEPRECATED and BOOST_FILESYSTEM_NO_DEPRECATED are defined # endif # if !defined(BOOST_FILESYSTEM_NO_DEPRECATED) // recently deprecated functions supplied by default path& normalize() { return m_normalize(); } path& remove_leaf() { return remove_filename(); } path leaf() const { return filename(); } path branch_path() const { return parent_path(); } bool has_leaf() const { return !m_pathname.empty(); } bool has_branch_path() const { return !parent_path().empty(); } bool is_complete() const { return is_absolute(); } # endif # if defined(BOOST_FILESYSTEM_DEPRECATED) // deprecated functions with enough signature or semantic changes that they are // not supplied by default const std::string file_string() const { return string(); } const std::string directory_string() const { return string(); } const std::string native_file_string() const { return string(); } const std::string native_directory_string() const { return string(); } const string_type external_file_string() const { return native(); } const string_type external_directory_string() const { return native(); } // older functions no longer supported //typedef bool (*name_check)(const std::string & name); //basic_path(const string_type& str, name_check) { operator/=(str); } //basic_path(const typename string_type::value_type* s, name_check) // { operator/=(s);} //static bool default_name_check_writable() { return false; } //static void default_name_check(name_check) {} //static name_check default_name_check() { return 0; } //basic_path& canonize(); # endif //--------------------------------------------------------------------------------------// // class path private members // //--------------------------------------------------------------------------------------// private: # if defined(_MSC_VER) # pragma warning(push) // Save warning settings # pragma warning(disable : 4251) // disable warning: class 'std::basic_string<_Elem,_Traits,_Ax>' # endif // needs to have dll-interface... /* m_pathname has the type, encoding, and format required by the native operating system. Thus for POSIX and Windows there is no conversion for passing m_pathname.c_str() to the O/S API or when obtaining a path from the O/S API. POSIX encoding is unspecified other than for dot and slash characters; POSIX just treats paths as a sequence of bytes. Windows encoding is UCS-2 or UTF-16 depending on the version. */ string_type m_pathname; // Windows: as input; backslashes NOT converted to slashes, // slashes NOT converted to backslashes # if defined(_MSC_VER) # pragma warning(pop) // restore warning settings. # endif string_type::size_type m_append_separator_if_needed(); // Returns: If separator is to be appended, m_pathname.size() before append. Otherwise 0. // Note: An append is never performed if size()==0, so a returned 0 is unambiguous. void m_erase_redundant_separator(string_type::size_type sep_pos); string_type::size_type m_parent_path_end() const; path& m_normalize(); // Was qualified; como433beta8 reports: // warning #427-D: qualified name is not allowed in member declaration friend class iterator; friend bool operator<(const path& lhs, const path& rhs); // see path::iterator::increment/decrement comment below static void m_path_iterator_increment(path::iterator & it); static void m_path_iterator_decrement(path::iterator & it); }; // class path namespace detail { BOOST_FILESYSTEM_DECL int lex_compare(path::iterator first1, path::iterator last1, path::iterator first2, path::iterator last2); } # ifndef BOOST_FILESYSTEM_NO_DEPRECATED typedef path wpath; # endif //------------------------------------------------------------------------------------// // class path::iterator // //------------------------------------------------------------------------------------// class path::iterator : public boost::iterator_facade< path::iterator, path const, boost::bidirectional_traversal_tag > { private: friend class boost::iterator_core_access; friend class boost::filesystem::path; friend void m_path_iterator_increment(path::iterator & it); friend void m_path_iterator_decrement(path::iterator & it); const path& dereference() const { return m_element; } bool equal(const iterator & rhs) const { return m_path_ptr == rhs.m_path_ptr && m_pos == rhs.m_pos; } // iterator_facade derived classes don't seem to like implementations in // separate translation unit dll's, so forward to class path static members void increment() { m_path_iterator_increment(*this); } void decrement() { m_path_iterator_decrement(*this); } path m_element; // current element const path* m_path_ptr; // path being iterated over string_type::size_type m_pos; // position of m_element in // m_path_ptr->m_pathname. // if m_element is implicit dot, m_pos is the // position of the last separator in the path. // end() iterator is indicated by // m_pos == m_path_ptr->m_pathname.size() }; // path::iterator //------------------------------------------------------------------------------------// // // // non-member functions // // // //------------------------------------------------------------------------------------// // std::lexicographical_compare would infinately recurse because path iterators // yield paths, so provide a path aware version inline bool lexicographical_compare(path::iterator first1, path::iterator last1, path::iterator first2, path::iterator last2) { return detail::lex_compare(first1, last1, first2, last2) < 0; } inline bool operator==(const path& lhs, const path& rhs) {return lhs.compare(rhs) == 0;} inline bool operator==(const path& lhs, const path::string_type& rhs) {return lhs.compare(rhs) == 0;} inline bool operator==(const path::string_type& lhs, const path& rhs) {return rhs.compare(lhs) == 0;} inline bool operator==(const path& lhs, const path::value_type* rhs) {return lhs.compare(rhs) == 0;} inline bool operator==(const path::value_type* lhs, const path& rhs) {return rhs.compare(lhs) == 0;} inline bool operator!=(const path& lhs, const path& rhs) {return lhs.compare(rhs) != 0;} inline bool operator!=(const path& lhs, const path::string_type& rhs) {return lhs.compare(rhs) != 0;} inline bool operator!=(const path::string_type& lhs, const path& rhs) {return rhs.compare(lhs) != 0;} inline bool operator!=(const path& lhs, const path::value_type* rhs) {return lhs.compare(rhs) != 0;} inline bool operator!=(const path::value_type* lhs, const path& rhs) {return rhs.compare(lhs) != 0;} // TODO: why do == and != have additional overloads, but the others don't? inline bool operator<(const path& lhs, const path& rhs) {return lhs.compare(rhs) < 0;} inline bool operator<=(const path& lhs, const path& rhs) {return !(rhs < lhs);} inline bool operator> (const path& lhs, const path& rhs) {return rhs < lhs;} inline bool operator>=(const path& lhs, const path& rhs) {return !(lhs < rhs);} inline std::size_t hash_value(const path& x) { # ifdef BOOST_WINDOWS_API std::size_t seed = 0; for(const path::value_type* it = x.c_str(); *it; ++it) hash_combine(seed, *it == '/' ? L'\\' : *it); return seed; # else // BOOST_POSIX_API return hash_range(x.native().begin(), x.native().end()); # endif } inline void swap(path& lhs, path& rhs) { lhs.swap(rhs); } inline path operator/(const path& lhs, const path& rhs) { return path(lhs) /= rhs; } // inserters and extractors // use boost::io::quoted() to handle spaces in paths // use '&' as escape character to ease use for Windows paths template <class Char, class Traits> inline std::basic_ostream<Char, Traits>& operator<<(std::basic_ostream<Char, Traits>& os, const path& p) { return os << boost::io::quoted(p.template string<std::basic_string<Char> >(), static_cast<Char>('&')); } template <class Char, class Traits> inline std::basic_istream<Char, Traits>& operator>>(std::basic_istream<Char, Traits>& is, path& p) { std::basic_string<Char> str; is >> boost::io::quoted(str, static_cast<Char>('&')); p = str; return is; } // name_checks // These functions are holdovers from version 1. It isn't clear they have much // usefulness, or how to generalize them for later versions. BOOST_FILESYSTEM_DECL bool portable_posix_name(const std::string & name); BOOST_FILESYSTEM_DECL bool windows_name(const std::string & name); BOOST_FILESYSTEM_DECL bool portable_name(const std::string & name); BOOST_FILESYSTEM_DECL bool portable_directory_name(const std::string & name); BOOST_FILESYSTEM_DECL bool portable_file_name(const std::string & name); BOOST_FILESYSTEM_DECL bool native(const std::string & name); //--------------------------------------------------------------------------------------// // class path member template implementation // //--------------------------------------------------------------------------------------// template <class InputIterator> path& path::append(InputIterator begin, InputIterator end, const codecvt_type& cvt) { if (begin == end) return *this; string_type::size_type sep_pos(m_append_separator_if_needed()); std::basic_string<typename std::iterator_traits<InputIterator>::value_type> s(begin, end); path_traits::convert(s.c_str(), s.c_str()+s.size(), m_pathname, cvt); if (sep_pos) m_erase_redundant_separator(sep_pos); return *this; } template <class Source> path& path::append(Source const& source, const codecvt_type& cvt) { if (path_traits::empty(source)) return *this; string_type::size_type sep_pos(m_append_separator_if_needed()); path_traits::dispatch(source, m_pathname, cvt); if (sep_pos) m_erase_redundant_separator(sep_pos); return *this; } //--------------------------------------------------------------------------------------// // class path member template specializations // //--------------------------------------------------------------------------------------// template <> inline std::string path::string<std::string>() const { return string(); } template <> inline std::wstring path::string<std::wstring>() const { return wstring(); } template <> inline std::string path::string<std::string>(const codecvt_type& cvt) const { return string(cvt); } template <> inline std::wstring path::string<std::wstring>(const codecvt_type& cvt) const { return wstring(cvt); } template <> inline std::string path::generic_string<std::string>() const { return generic_string(); } template <> inline std::wstring path::generic_string<std::wstring>() const { return generic_wstring(); } template <> inline std::string path::generic_string<std::string>(const codecvt_type& cvt) const { return generic_string(cvt); } template <> inline std::wstring path::generic_string<std::wstring>(const codecvt_type& cvt) const { return generic_wstring(cvt); } } // namespace filesystem } // namespace boost //----------------------------------------------------------------------------// #include <boost/config/abi_suffix.hpp> // pops abi_prefix.hpp pragmas #endif // BOOST_FILESYSTEM_PATH_HPP