diff options
Diffstat (limited to 'Utilities/std/cm/bits/fs_path.cxx')
| -rw-r--r-- | Utilities/std/cm/bits/fs_path.cxx | 1029 |
1 files changed, 1029 insertions, 0 deletions
diff --git a/Utilities/std/cm/bits/fs_path.cxx b/Utilities/std/cm/bits/fs_path.cxx new file mode 100644 index 0000000000..808999899c --- /dev/null +++ b/Utilities/std/cm/bits/fs_path.cxx @@ -0,0 +1,1029 @@ +/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying + file Copyright.txt or https://cmake.org/licensing for details. */ + +#include <cm/filesystem> // IWYU pragma: associated + +#if !defined(CMake_HAVE_CXX_FILESYSTEM) + +# include <algorithm> +# include <cassert> +# include <cstddef> +# include <cstdlib> +# include <functional> +# include <string> +# include <utility> +# include <vector> +# if defined(_WIN32) && !defined(__CYGWIN__) +# include <cctype> +# endif +# if defined(_WIN32) || defined(__CYGWIN__) +# include <iterator> +# endif + +# include <cm/memory> +# include <cm/string_view> +# include <cmext/string_view> + +namespace cm { +namespace filesystem { +namespace internals { + +class path_parser +{ +# if defined(__SUNPRO_CC) && defined(__sparc) + // Oracle DeveloperStudio C++ compiler generates wrong code if enum size + // is different than the default. + using enum_size = int; +# else + using enum_size = unsigned char; +# endif + + enum class state : enum_size + { + before_begin, + in_root_name, + in_root_dir, + in_filename, + trailing_separator, + at_end + }; + + using pointer = char const*; + +public: + enum class seek_position : enum_size + { + root_name = static_cast<enum_size>(state::in_root_name), + root_directory = static_cast<enum_size>(state::in_root_dir) + }; + enum class peek_fragment : enum_size + { + remainder, + path + }; + + path_parser(cm::string_view path, bool set_at_end = false) + : State(set_at_end ? state::at_end : state::before_begin) + , Path(path) + { + } + + path_parser(const path_parser&) = default; + + ~path_parser() = default; + + void reset() noexcept { this->set_state(state::before_begin); } + + void increment() noexcept + { + const pointer start = this->next_token(); + const pointer end = this->after_end(); + + if (start == end) { + this->set_state(state::at_end); + return; + } + + switch (this->State) { + case state::before_begin: { + auto pos = this->consume_root_name(start, end); + if (pos) { + this->set_state(state::in_root_name); + } else { + pos = this->consume_separator(start, end); + if (pos) { + this->set_state(state::in_root_dir); + } else { + this->consume_filename(start, end); + this->set_state(state::in_filename); + } + } + break; + } + case state::in_root_name: { + auto pos = this->consume_separator(start, end); + if (pos) { + this->set_state(state::in_root_dir); + } else { + this->consume_filename(start, end); + this->set_state(state::in_filename); + } + break; + } + case state::in_root_dir: { + this->consume_filename(start, end); + this->set_state(state::in_filename); + break; + } + case state::in_filename: { + auto posSep = this->consume_separator(start, end); + if (posSep != end) { + auto pos = this->consume_filename(posSep, end); + if (pos) { + return; + } + } + set_state(state::trailing_separator); + break; + } + case state::trailing_separator: { + this->set_state(state::at_end); + break; + } + case state::at_end: + // unreachable + std::abort(); + } + } + + void decrement() noexcept + { + const pointer rstart = this->current_token() - 1; + const pointer rend = this->before_start(); + + if (rstart == rend) { + this->set_state(state::before_begin); + return; + } + + switch (this->State) { + case state::at_end: { + auto posSep = this->consume_separator(rstart, rend); + if (posSep) { + if (posSep == rend) { + this->set_state(state::in_root_dir); + } else { + auto pos = this->consume_root_name(posSep, rend, true); + if (pos == rend) { + this->set_state(state::in_root_dir); + } else { + this->set_state(state::trailing_separator); + } + } + } else { + auto pos = this->consume_root_name(rstart, rend); + if (pos == rend) { + this->set_state(state::in_root_name); + } else { + this->consume_filename(rstart, rend); + this->set_state(state::in_filename); + } + } + break; + } + case state::trailing_separator: { + this->consume_filename(rstart, rend); + this->set_state(state::in_filename); + break; + } + case state::in_filename: { + auto posSep = this->consume_separator(rstart, rend); + if (posSep == rend) { + this->set_state(state::in_root_dir); + } else { + auto pos = this->consume_root_name(posSep, rend, true); + if (pos == rend) { + this->set_state(state::in_root_dir); + } else { + this->consume_filename(posSep, rend); + this->set_state(state::in_filename); + } + } + break; + } + case state::in_root_dir: { + auto pos = this->consume_root_name(rstart, rend); + if (pos) { + this->set_state(state::in_root_name); + } + break; + } + case state::in_root_name: + case state::before_begin: { + // unreachable + std::abort(); + } + } + } + + path_parser& operator++() noexcept + { + this->increment(); + return *this; + } + + path_parser& operator--() noexcept + { + this->decrement(); + return *this; + } + + cm::string_view operator*() const noexcept + { + switch (this->State) { + case state::before_begin: + case state::at_end: + return cm::string_view(); + case state::trailing_separator: + return ""; + case state::in_root_dir: + case state::in_root_name: + case state::in_filename: + return this->Entry; + default: + // unreachable + std::abort(); + } + } + + void seek(seek_position position) + { + state s = static_cast<state>(static_cast<int>(position)); + + while (this->State <= s) { + this->increment(); + } + } + + cm::string_view peek(peek_fragment fragment) + { + if (fragment == peek_fragment::remainder) { + // peek-up remain part of the initial path + return { this->Entry.data(), + std::size_t(&this->Path.back() - this->Entry.data() + 1) }; + } + if (fragment == peek_fragment::path) { + // peek-up full path until current position + return { this->Path.data(), + std::size_t(&this->Entry.back() - this->Path.data() + 1) }; + } + return {}; + } + + bool in_root_name() const { return this->State == state::in_root_name; } + bool in_root_directory() const { return this->State == state::in_root_dir; } + bool at_end() const { return this->State == state::at_end; } + + bool at_start() const { return this->Entry.data() == this->Path.data(); } + +private: + void set_state(state newState) noexcept + { + this->State = newState; + if (newState == state::before_begin || newState == state::at_end) { + this->Entry = {}; + } + } + + pointer before_start() const noexcept { return this->Path.data() - 1; } + pointer after_end() const noexcept + { + return this->Path.data() + this->Path.size(); + } + + pointer current_token() const noexcept + { + switch (this->State) { + case state::before_begin: + case state::in_root_name: + return &this->Path.front(); + case state::in_root_dir: + case state::in_filename: + case state::trailing_separator: + return &this->Entry.front(); + case state::at_end: + return &this->Path.back() + 1; + default: + // unreachable + std::abort(); + } + } + pointer next_token() const noexcept + { + switch (this->State) { + case state::before_begin: + return this->Path.data(); + case state::in_root_name: + case state::in_root_dir: + case state::in_filename: + return &this->Entry.back() + 1; + case state::trailing_separator: + case state::at_end: + return after_end(); + default: + // unreachable + std::abort(); + } + } + + pointer consume_separator(pointer ptr, pointer end) noexcept + { + if (ptr == end || + (*ptr != '/' +# if defined(_WIN32) + && *ptr != '\\' +# endif + )) { + return nullptr; + } + const auto step = ptr < end ? 1 : -1; + ptr += step; + while (ptr != end && + (*ptr == '/' +# if defined(_WIN32) + || *ptr == '\\' +# endif + )) { + ptr += step; + } + if (step == 1) { + this->Entry = cm::string_view(ptr - 1, 1); + } else { + this->Entry = cm::string_view(ptr + 1, 1); + } + + return ptr; + } + + pointer consume_filename(pointer ptr, pointer end) noexcept + { + auto start = ptr; + + if (ptr == end || *ptr == '/' +# if defined(_WIN32) + || *ptr == '\\' +# endif + ) { + return nullptr; + } + const auto step = ptr < end ? 1 : -1; + ptr += step; + while (ptr != end && *ptr != '/' +# if defined(_WIN32) + && *ptr != '\\' +# endif + ) { + ptr += step; + } + +# if defined(_WIN32) + if (step == -1 && (start - ptr) >= 2 && ptr == end) { + // rollback drive name consumption, if any + if (this->is_drive_name(ptr + 1)) { + ptr += 2; + } + if (ptr == start) { + return nullptr; + } + } +# endif + + if (step == 1) { + this->Entry = cm::string_view(start, ptr - start); + } else { + this->Entry = cm::string_view(ptr + 1, start - ptr); + } + + return ptr; + } + +# if defined(_WIN32) + bool is_drive_name(pointer ptr) + { + return std::toupper(ptr[0]) >= 'A' && std::toupper(ptr[0]) <= 'Z' && + ptr[1] == ':'; + } +# endif + + pointer consume_root_name(pointer ptr, pointer end, + bool check_only = false) noexcept + { +# if defined(_WIN32) && !defined(__CYGWIN__) + if (ptr < end) { + if ((end - ptr) >= 2 && this->is_drive_name(ptr)) { + // Drive letter (X:) is a root name + if (!check_only) { + this->Entry = cm::string_view(ptr, 2); + } + return ptr + 2; + } + if ((end - ptr) > 2 && (ptr[0] == '/' || ptr[0] == '\\') && + (ptr[1] == '/' || ptr[1] == '\\') && + (ptr[2] != '/' && ptr[2] != '\\')) { + // server name (//server) is a root name + auto pos = std::find_if(ptr + 2, end, + [](char c) { return c == '/' || c == '\\'; }); + if (!check_only) { + this->Entry = cm::string_view(ptr, pos - ptr); + } + return pos; + } + } else { + if ((ptr - end) >= 2 && this->is_drive_name(ptr - 1)) { + // Drive letter (X:) is a root name + if (!check_only) { + this->Entry = cm::string_view(ptr - 1, 2); + } + return ptr - 2; + } + if ((ptr - end) > 2 && (ptr[0] != '/' && ptr[0] != '\\')) { + std::reverse_iterator<pointer> start(ptr); + std::reverse_iterator<pointer> stop(end); + auto res = std::find_if(start, stop, + [](char c) { return c == '/' || c == '\\'; }); + pointer pos = res.base() - 1; + if ((pos - 1) > end && (pos[-1] == '/' || pos[-1] == '\\')) { + // server name (//server) is a root name + if (!check_only) { + this->Entry = cm::string_view(pos - 1, ptr - pos + 2); + } + return pos - 2; + } + } + } +# elif defined(__CYGWIN__) + if (ptr < end) { + if ((end - ptr) > 2 && ptr[0] == '/' && ptr[1] == '/' && ptr[2] != '/') { + // server name (//server) is a root name + auto pos = std::find(ptr + 2, end, '/'); + if (!check_only) { + this->Entry = cm::string_view(ptr, pos - ptr); + } + return pos; + } + } else { + if ((ptr - end) > 2 && ptr[0] != '/') { + std::reverse_iterator<pointer> start(ptr); + std::reverse_iterator<pointer> stop(end); + auto res = std::find(start, stop, '/'); + pointer pos = res.base() - 1; + if ((pos - 1) > end && pos[-1] == '/') { + // server name (//server) is a root name + if (!check_only) { + this->Entry = cm::string_view(pos - 1, ptr - pos + 2); + } + return pos - 2; + } + } + } +# else + (void)ptr; + (void)end; + (void)check_only; +# endif + return nullptr; + } + + state State; + const cm::string_view Path; + cm::string_view Entry; +}; + +// class unicode_helper +void unicode_helper::append(std::string& str, std::uint32_t codepoint) +{ + if (codepoint <= 0x7f) { + str.push_back(static_cast<char>(codepoint)); + } else if (codepoint >= 0x80 && codepoint <= 0x7ff) { + str.push_back(static_cast<char>((codepoint >> 6) + 192)); + str.push_back(static_cast<char>((codepoint & 0x3f) + 128)); + } else if ((codepoint >= 0x800 && codepoint <= 0xd7ff) || + (codepoint >= 0xe000 && codepoint <= 0xffff)) { + str.push_back(static_cast<char>((codepoint >> 12) + 224)); + str.push_back(static_cast<char>(((codepoint & 0xfff) >> 6) + 128)); + str.push_back(static_cast<char>((codepoint & 0x3f) + 128)); + } else if (codepoint >= 0x10000 && codepoint <= 0x10ffff) { + str.push_back(static_cast<char>((codepoint >> 18) + 240)); + str.push_back(static_cast<char>(((codepoint & 0x3ffff) >> 12) + 128)); + str.push_back(static_cast<char>(((codepoint & 0xfff) >> 6) + 128)); + str.push_back(static_cast<char>((codepoint & 0x3f) + 128)); + } else { + append(str, 0xfffd); + } +} + +unicode_helper::utf8_state unicode_helper::decode(const utf8_state state, + const std::uint8_t fragment, + std::uint32_t& codepoint) +{ + const std::uint32_t utf8_state_info[] = { + // encoded states + 0x11111111u, 0x11111111u, 0x77777777u, 0x77777777u, 0x88888888u, + 0x88888888u, 0x88888888u, 0x88888888u, 0x22222299u, 0x22222222u, + 0x22222222u, 0x22222222u, 0x3333333au, 0x33433333u, 0x9995666bu, + 0x99999999u, 0x88888880u, 0x22818108u, 0x88888881u, 0x88888882u, + 0x88888884u, 0x88888887u, 0x88888886u, 0x82218108u, 0x82281108u, + 0x88888888u, 0x88888883u, 0x88888885u, 0u, 0u, + 0u, 0u, + }; + std::uint8_t category = fragment < 128 + ? 0 + : (utf8_state_info[(fragment >> 3) & 0xf] >> ((fragment & 7) << 2)) & 0xf; + codepoint = (state ? (codepoint << 6) | (fragment & 0x3fu) + : (0xffu >> category) & fragment); + return state == s_reject + ? s_reject + : static_cast<utf8_state>( + (utf8_state_info[category + 16] >> (state << 2)) & 0xf); +} + +} // internals + +// Class path +path& path::operator/=(const path& p) +{ + if (p.is_absolute() || + (p.has_root_name() && p.get_root_name() != this->get_root_name())) { + this->path_ = p.path_; + return *this; + } + if (p.has_root_directory()) { + this->path_ = static_cast<std::string>(this->get_root_name()); + this->path_ += static_cast<std::string>(p.get_root_directory()); + } else if (this->has_filename()) { + this->path_ += this->preferred_separator; +# if defined(_WIN32) || defined(__CYGWIN__) + // special case: "//host" / "b" => "//host/b" + } else if (this->has_root_name() && !this->has_root_directory()) { + if (this->path_.length() >= 3 && + (this->path_[0] == '/' +# if defined(_WIN32) && !defined(__CYGWIN__) + || this->path_[0] == '\\' +# endif + ) && + (this->path_[1] == '/' +# if defined(_WIN32) && !defined(__CYGWIN__) + || this->path_[1] == '\\' +# endif + ) && + (this->path_[2] != '/' +# if defined(_WIN32) && !defined(__CYGWIN__) + && this->path_[2] != '\\' +# endif + )) { + this->path_ += this->preferred_separator; + } +# endif + } + + this->path_ += p.get_relative_path(); + return *this; +} + +path path::lexically_normal() const +{ + if (this->path_.empty()) { + return *this; + } + + const cm::string_view dot = "."_s; + const cm::string_view dotdot = ".."_s; + + std::vector<cm::string_view> root_parts; + std::vector<cm::string_view> parts; + bool root_directory_defined = false; + bool need_final_separator = false; + std::size_t path_size = 0; + + internals::path_parser parser(this->path_); + ++parser; + while (!parser.at_end()) { + auto part = *parser; + + if (parser.in_root_name() || parser.in_root_directory()) { + if (parser.in_root_directory()) { + root_directory_defined = true; + } + root_parts.push_back(part); + path_size += part.size(); + } else if (part == dotdot) { + if (!parts.empty() && parts.back() != dotdot) { + need_final_separator = true; + path_size -= parts.back().size(); + parts.pop_back(); + } else if ((parts.empty() || parts.back() == dotdot) && + !root_directory_defined) { + parts.push_back(dotdot); + path_size += 2; + } + + } else if (part == dot || part.empty()) { + need_final_separator = true; + if (part.empty()) { + parts.push_back(part); + } + } else { + // filename + need_final_separator = false; + parts.push_back(part); + path_size += part.size(); + } + ++parser; + } + + // no final separator if last element of path is ".." + need_final_separator = + need_final_separator && !parts.empty() && parts.back() != dotdot; + + // build final path + //// compute final size of path + path_size += parts.size() + (need_final_separator ? 1 : 0); + + std::string np; + np.reserve(path_size); + for (const auto& p : root_parts) { + np += p; + } + // convert any slash to the preferred_separator + if (static_cast<std::string::value_type>(this->preferred_separator) != '/') { + std::replace( + np.begin(), np.end(), '/', + static_cast<std::string::value_type>(this->preferred_separator)); + } + for (const auto& p : parts) { + if (!p.empty()) { + np += p; + np += static_cast<std::string::value_type>(this->preferred_separator); + } + } + if (!parts.empty() && !need_final_separator) { + // remove extra separator + np.pop_back(); + } + if (np.empty()) { + np.assign(1, '.'); + } + + return path(std::move(np)); +} + +path path::lexically_relative(const path& base) const +{ + internals::path_parser parser(this->path_); + ++parser; + internals::path_parser parserbase(base.path_); + ++parserbase; + cm::string_view this_root_name, base_root_name; + cm::string_view this_root_dir, base_root_dir; + + if (parser.in_root_name()) { + this_root_name = *parser; + ++parser; + } + if (parser.in_root_directory()) { + this_root_dir = *parser; + ++parser; + } + if (parserbase.in_root_name()) { + base_root_name = *parserbase; + ++parserbase; + } + if (parserbase.in_root_directory()) { + base_root_dir = *parserbase; + ++parserbase; + } + + auto is_path_absolute = [](cm::string_view rn, cm::string_view rd) -> bool { +# if defined(_WIN32) && !defined(__CYGWIN__) + return !rn.empty() && !rd.empty(); +# else + (void)rn; + return !rd.empty(); +# endif + }; + + if (this_root_name != base_root_name || + is_path_absolute(this_root_name, this_root_dir) != + is_path_absolute(base_root_name, base_root_dir) || + (this_root_dir.empty() && !base_root_dir.empty())) { + return path(); + } + +# if defined(_WIN32) && !defined(__CYGWIN__) + // LWG3070 handle special case: filename can also be a root-name + auto is_drive_name = [](cm::string_view item) -> bool { + return item.length() == 2 && item[1] == ':'; + }; + parser.reset(); + parser.seek(internals::path_parser::seek_position::root_directory); + while (!parser.at_end()) { + if (is_drive_name(*parser)) { + return path(); + } + ++parser; + } + parserbase.reset(); + parserbase.seek(internals::path_parser::seek_position::root_directory); + while (!parserbase.at_end()) { + if (is_drive_name(*parserbase)) { + return path(); + } + ++parserbase; + } +# endif + + const cm::string_view dot = "."_s; + const cm::string_view dotdot = ".."_s; + + auto a = this->begin(), aend = this->end(); + auto b = base.begin(), bend = base.end(); + while (a != aend && b != bend && a->string() == b->string()) { + ++a; + ++b; + } + + int count = 0; + for (; b != bend; ++b) { + auto part = *b; + if (part == dotdot) { + --count; + } else if (part.string() != dot && !part.empty()) { + ++count; + } + } + + if (count == 0 && (a == this->end() || a->empty())) { + return path(dot); + } + if (count >= 0) { + path result; + path p_dotdot(dotdot); + for (int i = 0; i < count; ++i) { + result /= p_dotdot; + } + for (; a != aend; ++a) { + result /= *a; + } + return result; + } + // count < 0 + return path(); +} + +path::path_type path::get_generic() const +{ + auto gen_path = this->path_; + auto start = gen_path.begin(); +# if defined(_WIN32) && !defined(__CYGWIN__) + std::replace(gen_path.begin(), gen_path.end(), '\\', '/'); + // preserve special syntax for root_name ('//server' or '//?') + if (gen_path.length() > 2 && gen_path[2] != '/') { + start += 2; + } +# endif + // remove duplicate separators + auto new_end = std::unique(start, gen_path.end(), [](char lhs, char rhs) { + return lhs == rhs && lhs == '/'; + }); + gen_path.erase(new_end, gen_path.end()); + return gen_path; +} + +cm::string_view path::get_root_name() const +{ + internals::path_parser parser(this->path_); + ++parser; + if (parser.in_root_name()) { + return *parser; + } + return {}; +} + +cm::string_view path::get_root_directory() const +{ + internals::path_parser parser(this->path_); + ++parser; + if (parser.in_root_name()) { + ++parser; + } + if (parser.in_root_directory()) { + return *parser; + } + return {}; +} + +cm::string_view path::get_relative_path() const +{ + internals::path_parser parser(this->path_); + parser.seek(internals::path_parser::seek_position::root_directory); + if (parser.at_end()) { + return {}; + } + return parser.peek(internals::path_parser::peek_fragment::remainder); +} + +cm::string_view path::get_parent_path() const +{ + if (!this->has_relative_path()) { + return this->path_; + } + + // peek-up full path minus last element + internals::path_parser parser(this->path_, true); + --parser; + if (parser.at_start()) { + return {}; + } + --parser; + return parser.peek(internals::path_parser::peek_fragment::path); +} + +cm::string_view path::get_filename() const +{ + { + internals::path_parser parser(this->path_); + parser.seek(internals::path_parser::seek_position::root_directory); + if (parser.at_end()) { + return {}; + } + } + { + internals::path_parser parser(this->path_, true); + return *(--parser); + } +} + +cm::string_view path::get_filename_fragment(filename_fragment fragment) const +{ + auto file = this->get_filename(); + + if (file == "." || file == ".." || file.empty()) { + return fragment == filename_fragment::stem ? file : cm::string_view{}; + } + + auto pos = file.find_last_of('.'); + if (pos == cm::string_view::npos || pos == 0) { + return fragment == filename_fragment::stem ? file : cm::string_view{}; + } + return fragment == filename_fragment::stem ? file.substr(0, pos) + : file.substr(pos); +} + +int path::compare_path(cm::string_view str) const +{ + internals::path_parser this_pp(this->path_); + ++this_pp; + internals::path_parser other_pp(str); + ++other_pp; + + // compare root_name part + { + bool compare_root_names = false; + cm::string_view this_root_name, other_root_name; + int res; + + if (this_pp.in_root_name()) { + compare_root_names = true; + this_root_name = *this_pp; + ++this_pp; + } + if (other_pp.in_root_name()) { + compare_root_names = true; + other_root_name = *other_pp; + ++other_pp; + } + if (compare_root_names && + (res = this_root_name.compare(other_root_name) != 0)) { + return res; + } + } + + // compare root_directory part + { + if (!this_pp.in_root_directory() && other_pp.in_root_directory()) { + return -1; + } else if (this_pp.in_root_directory() && !other_pp.in_root_directory()) { + return 1; + } + if (this_pp.in_root_directory()) { + ++this_pp; + } + if (other_pp.in_root_directory()) { + ++other_pp; + } + } + + // compare various parts of the paths + while (!this_pp.at_end() && !other_pp.at_end()) { + int res; + if ((res = (*this_pp).compare(*other_pp)) != 0) { + return res; + } + ++this_pp; + ++other_pp; + } + + // final step + if (this_pp.at_end() && !other_pp.at_end()) { + return -1; + } else if (!this_pp.at_end() && other_pp.at_end()) { + return 1; + } + + return 0; +} + +// Class path::iterator +path::iterator::iterator() + : path_(nullptr) +{ +} +path::iterator::iterator(const iterator& other) +{ + this->path_ = other.path_; + if (other.parser_) { + this->parser_ = cm::make_unique<internals::path_parser>(*other.parser_); + this->path_element_ = path(**this->parser_); + } +} +path::iterator::iterator(const path* p, bool at_end) + : path_(p) + , parser_(cm::make_unique<internals::path_parser>(p->path_, at_end)) +{ + if (!at_end) { + ++(*this->parser_); + this->path_element_ = path(**this->parser_); + } +} + +path::iterator::~iterator() = default; + +path::iterator& path::iterator::operator=(const iterator& other) +{ + this->path_ = other.path_; + if (other.parser_) { + this->parser_ = cm::make_unique<internals::path_parser>(*other.parser_); + this->path_element_ = path(**this->parser_); + } + + return *this; +} + +path::iterator& path::iterator::operator++() +{ + assert(this->parser_); + + if (this->parser_) { + assert(!this->parser_->at_end()); + + if (!this->parser_->at_end()) { + ++(*this->parser_); + if (this->parser_->at_end()) { + this->path_element_ = path(); + } else { + this->path_element_ = path(**this->parser_); + } + } + } + + return *this; +} + +path::iterator& path::iterator::operator--() +{ + assert(this->parser_); + + if (this->parser_) { + assert(!this->parser_->at_start()); + + if (!this->parser_->at_start()) { + --(*this->parser_); + this->path_element_ = path(**this->parser_); + } + } + + return *this; +} + +bool operator==(const path::iterator& lhs, const path::iterator& rhs) +{ + return lhs.path_ == rhs.path_ && lhs.parser_ != nullptr && + ((lhs.parser_->at_end() && rhs.parser_->at_end()) || + (lhs.parser_->at_start() && rhs.parser_->at_start()) || + ((**lhs.parser_).data() == (**rhs.parser_).data())); +} + +std::size_t hash_value(const path& p) noexcept +{ + internals::path_parser parser(p.path_); + std::hash<cm::string_view> hasher; + std::size_t value = 0; + + while (!parser.at_end()) { + value = hasher(*parser) + 0x9e3779b9 + (value << 6) + (value >> 2); + ++parser; + } + + return value; +} +} // filesystem +} // cm + +#else + +// Avoid empty translation unit. +void cm_filesystem_path_cxx() +{ +} + +#endif |