2018-04-13 16:57:04 +00:00
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/** @addtogroup Utilities
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* @{
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*/
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/** @file path.hh
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*
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* @brief A module for manipulation of filesystem paths.
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*
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* The path module implements facilities for manipulation of both pure
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* paths and actual filesystem paths. POSIX and Windows path encodings
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* are supported and common filesystem related operations are implemented
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* in a portable manner.
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*
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* This module replaces the C++17 filesystem module, aiming to be simpler
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* and higher level. For instance, it uses purely 8-bit encoding on all
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* platforms, taking care of conversions internally.
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*
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* @copyright See COPYING.md in the project tree for further information.
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*/
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#ifndef OSTD_PATH_HH
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#define OSTD_PATH_HH
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2018-04-14 15:46:44 +00:00
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#include <string.h>
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2018-04-13 16:57:04 +00:00
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#include <utility>
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#include <initializer_list>
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#include <type_traits>
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2018-04-13 23:29:01 +00:00
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#include <system_error>
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2018-04-13 16:57:04 +00:00
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2018-04-13 23:29:01 +00:00
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#include <ostd/platform.hh>
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2018-04-13 16:57:04 +00:00
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#include <ostd/string.hh>
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2018-04-13 23:29:01 +00:00
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#include <ostd/format.hh>
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/* path representation is within ostd namespace, there aren't any APIs to
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* do actual filesystem manipulation, that's all in the fs namespace below
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*/
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2018-04-13 16:57:04 +00:00
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namespace ostd {
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/** @addtogroup Utilities
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* @{
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*/
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struct path {
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2018-04-14 15:46:44 +00:00
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#ifdef OSTD_PLATFORM_WIN32
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static constexpr char native_separator = '\\';
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#else
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static constexpr char native_separator = '/';
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#endif
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2018-04-13 16:57:04 +00:00
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enum class format {
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native = 0,
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posix,
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windows
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};
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template<typename R>
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2018-04-14 19:28:01 +00:00
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path(R range, format fmt = format::native): p_path("."), p_fmt(fmt) {
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2018-04-13 16:57:04 +00:00
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if constexpr(std::is_constructible_v<std::string, R const &>) {
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2018-04-14 19:28:01 +00:00
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append_str(std::string{range});
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} else if (!range.empty()) {
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2018-04-13 16:57:04 +00:00
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for (auto const &elem: range) {
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2018-04-14 19:28:01 +00:00
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append_str(std::string{elem});
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2018-04-13 16:57:04 +00:00
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}
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}
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}
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path(format fmt = format::native): path(".", fmt) {}
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template<typename T>
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path(std::initializer_list<T> init, format fmt = format::native):
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path(iter(init), fmt)
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{}
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2018-04-13 23:29:01 +00:00
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path(path const &p):
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p_path(p.p_path), p_fmt(p.p_fmt)
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{}
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path(path const &p, format fmt):
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p_path(p.p_path), p_fmt(fmt)
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2018-04-14 19:28:01 +00:00
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{
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if (path_fmt(fmt) != path_fmt(p.p_fmt)) {
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convert_path();
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}
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}
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2018-04-13 23:29:01 +00:00
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2018-04-15 15:40:20 +00:00
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path(path &&p) noexcept:
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2018-04-13 23:42:15 +00:00
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p_path(std::move(p.p_path)), p_fmt(p.p_fmt)
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2018-04-14 19:28:01 +00:00
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{
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p.p_path = ".";
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}
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2018-04-13 23:29:01 +00:00
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2018-04-13 23:42:15 +00:00
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path(path &&p, format fmt):
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p_path(std::move(p.p_path)), p_fmt(fmt)
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2018-04-14 19:28:01 +00:00
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{
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p.p_path = ".";
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if (path_fmt(fmt) != path_fmt(p.p_fmt)) {
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convert_path();
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}
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}
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2018-04-13 23:29:01 +00:00
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path &operator=(path const &p) {
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p_path = p.p_path;
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p_fmt = p.p_fmt;
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return *this;
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}
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2018-04-15 15:40:20 +00:00
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path &operator=(path &&p) noexcept {
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2018-04-13 23:29:01 +00:00
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swap(p);
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p.clear();
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return *this;
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}
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2018-04-15 15:40:20 +00:00
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char separator() const noexcept {
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2018-04-14 15:46:44 +00:00
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static const char seps[] = { native_separator, '/', '\\' };
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return seps[std::size_t(p_fmt)];
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}
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2018-04-15 15:40:20 +00:00
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string_range drive() const noexcept {
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2018-04-14 15:46:44 +00:00
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if (is_win()) {
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2018-04-15 14:34:30 +00:00
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string_range path = p_path;
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if (has_dslash(path)) {
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2018-04-14 15:46:44 +00:00
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char const *endp = strchr(p_path.data() + 2, '\\');
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if (!endp) {
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2018-04-15 14:34:30 +00:00
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return path;
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2018-04-14 15:46:44 +00:00
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}
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char const *pendp = strchr(endp, '\\');
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if (!pendp) {
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2018-04-15 14:34:30 +00:00
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return path;
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2018-04-14 15:46:44 +00:00
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}
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2018-04-15 14:34:30 +00:00
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return string_range{path.data(), pendp};
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} else if (has_letter(path)) {
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return path.slice(0, 2);
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2018-04-14 15:46:44 +00:00
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}
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}
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2018-04-15 14:34:30 +00:00
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return nullptr;
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2018-04-14 15:46:44 +00:00
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}
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2018-04-15 15:40:20 +00:00
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bool has_drive() const noexcept {
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2018-04-14 21:21:58 +00:00
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if (is_win()) {
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2018-04-15 14:34:30 +00:00
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return (has_letter(p_path) || has_dslash(p_path));
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2018-04-14 21:21:58 +00:00
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}
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return false;
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}
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2018-04-15 15:40:20 +00:00
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string_range root() const noexcept {
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2018-04-15 14:34:30 +00:00
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char const *rootp = get_rootp();
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if (rootp) {
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return string_range{rootp, rootp + 1};
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2018-04-14 21:21:58 +00:00
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}
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2018-04-15 14:34:30 +00:00
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return nullptr;
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2018-04-14 21:21:58 +00:00
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}
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2018-04-15 15:40:20 +00:00
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bool has_root() const noexcept {
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2018-04-15 14:34:30 +00:00
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return !!get_rootp();
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2018-04-14 15:46:44 +00:00
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}
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2018-04-15 15:40:20 +00:00
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string_range anchor() const noexcept {
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2018-04-15 14:34:30 +00:00
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string_range dr = drive();
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if (dr.empty()) {
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return root();
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}
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char const *datap = dr.data();
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std::size_t datas = dr.size();
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if (datap[datas] == separator()) {
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return string_range{datap, datap + datas + 1};
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}
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return dr;
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2018-04-14 15:46:44 +00:00
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}
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2018-04-15 15:40:20 +00:00
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bool has_anchor() const noexcept {
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2018-04-14 21:21:58 +00:00
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return has_root() || has_drive();
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}
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2018-04-14 15:46:44 +00:00
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path parent() const {
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path rel = relative_to(anchor());
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2018-04-14 21:21:58 +00:00
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if (rel.p_path == ".") {
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2018-04-14 15:46:44 +00:00
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return *this;
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}
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return ostd::string_range{
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p_path.data(), strrchr(p_path.data(), separator())
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};
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}
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2018-04-15 15:40:20 +00:00
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bool has_parent() const noexcept {
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2018-04-14 21:21:58 +00:00
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return (parent().p_path != p_path);
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}
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path relative() const {
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return relative_to(anchor());
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}
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2018-04-15 15:40:20 +00:00
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string_range name() const noexcept {
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2018-04-15 14:34:30 +00:00
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string_range rel = relative_to_str(anchor());
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string_range sep = ostd::find_last(rel, separator());
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if (sep.empty()) {
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return rel;
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2018-04-14 15:46:44 +00:00
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}
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2018-04-15 14:34:30 +00:00
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sep.pop_front();
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return sep;
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2018-04-14 15:46:44 +00:00
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}
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2018-04-15 15:40:20 +00:00
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bool has_name() const noexcept {
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2018-04-14 21:21:58 +00:00
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return !name().empty();
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}
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2018-04-15 15:40:20 +00:00
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string_range suffix() const noexcept {
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2018-04-15 14:34:30 +00:00
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return ostd::find_last(relative_to_str(anchor()), '.');
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2018-04-14 15:46:44 +00:00
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}
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2018-04-15 15:40:20 +00:00
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string_range suffixes() const noexcept {
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2018-04-15 14:34:30 +00:00
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return ostd::find(name(), '.');
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2018-04-14 15:46:44 +00:00
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}
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2018-04-15 15:40:20 +00:00
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bool has_suffix() const noexcept {
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2018-04-14 21:21:58 +00:00
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return !suffixes().empty();
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}
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2018-04-15 15:40:20 +00:00
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string_range stem() const noexcept {
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2018-04-14 15:46:44 +00:00
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auto nm = name();
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2018-04-15 14:34:30 +00:00
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return nm.slice(0, nm.size() - ostd::find(nm, '.').size());
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2018-04-14 15:46:44 +00:00
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}
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2018-04-15 15:40:20 +00:00
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bool has_stem() const noexcept {
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2018-04-14 21:21:58 +00:00
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return !stem().empty();
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}
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2018-04-15 15:40:20 +00:00
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bool is_absolute() const noexcept {
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2018-04-15 13:30:30 +00:00
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if (is_win()) {
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2018-04-15 14:34:30 +00:00
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if (has_dslash(p_path)) {
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2018-04-15 13:30:30 +00:00
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return true;
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}
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return (has_letter(p_path) && (p_path.data()[2] == '\\'));
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}
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return (p_path.data()[0] == '/');
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}
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2018-04-15 15:40:20 +00:00
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bool is_relative() const noexcept {
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2018-04-15 13:30:30 +00:00
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return !is_absolute();
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}
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2018-04-15 14:34:30 +00:00
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path relative_to(path const &other) const {
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if (path_fmt(other.p_fmt) != path_fmt(p_fmt)) {
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return relative_to_str(path{other, p_fmt}.p_path);
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} else {
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return relative_to_str(other.p_path);
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2018-04-14 15:46:44 +00:00
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}
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}
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2018-04-14 21:21:58 +00:00
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path &remove_name() {
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auto nm = name();
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if (nm.empty()) {
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/* TODO: throw */
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return *this;
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}
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2018-04-15 14:34:30 +00:00
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p_path.erase(p_path.size() - nm.size() - 1, nm.size() + 1);
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2018-04-14 21:21:58 +00:00
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return *this;
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}
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path without_name() const {
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path ret{*this};
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ret.remove_name();
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return ret;
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}
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path &replace_name(string_range name) {
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remove_name();
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append_str(std::string{name});
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return *this;
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}
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path with_name(string_range name) {
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path ret{*this};
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ret.replace_name(name);
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return ret;
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}
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path &replace_suffix(string_range sfx) {
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auto osfx = suffix();
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if (!osfx.empty()) {
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2018-04-15 14:34:30 +00:00
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p_path.erase(p_path.size() - osfx.size(), osfx.size());
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2018-04-14 21:21:58 +00:00
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}
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p_path.append(sfx);
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return *this;
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}
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path &replace_suffixes(string_range sfx) {
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auto sfxs = suffixes();
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if (!sfxs.empty()) {
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2018-04-15 14:34:30 +00:00
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p_path.erase(p_path.size() - sfxs.size(), sfxs.size());
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2018-04-14 21:21:58 +00:00
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}
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p_path.append(sfx);
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return *this;
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}
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path with_suffix(string_range sfx) {
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path ret{*this};
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ret.replace_suffix(sfx);
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return ret;
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}
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path with_suffixes(string_range sfx) {
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path ret{*this};
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ret.replace_suffixes(sfx);
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return ret;
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}
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2018-04-13 16:57:04 +00:00
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path join(path const &p) const {
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path ret{*this};
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ret.append(p);
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return ret;
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}
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path &append(path const &p) {
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2018-04-15 13:17:49 +00:00
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append_str(p.p_path, path_fmt(p.p_fmt) == path_fmt(p_fmt));
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2018-04-13 16:57:04 +00:00
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return *this;
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}
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2018-04-14 21:21:58 +00:00
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path &append_concat(path const &p) {
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2018-04-14 23:11:14 +00:00
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append_concat_str(p.p_path);
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2018-04-14 21:21:58 +00:00
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return *this;
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}
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path concat(path const &p) const {
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path ret{*this};
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ret.append_concat(p);
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|
return ret;
|
|
|
|
}
|
|
|
|
|
2018-04-13 16:57:04 +00:00
|
|
|
path &operator/=(path const &p) {
|
|
|
|
return append(p);
|
|
|
|
}
|
|
|
|
|
2018-04-14 21:21:58 +00:00
|
|
|
path &operator+=(path const &p) {
|
|
|
|
return append_concat(p);
|
|
|
|
}
|
|
|
|
|
2018-04-15 15:40:20 +00:00
|
|
|
string_range string() const noexcept {
|
2018-04-13 16:57:04 +00:00
|
|
|
return p_path;
|
|
|
|
}
|
|
|
|
|
2018-04-15 15:40:20 +00:00
|
|
|
format path_format() const noexcept {
|
2018-04-13 16:57:04 +00:00
|
|
|
return p_fmt;
|
|
|
|
}
|
|
|
|
|
2018-04-13 23:29:01 +00:00
|
|
|
void clear() {
|
2018-04-14 19:28:01 +00:00
|
|
|
p_path = ".";
|
2018-04-13 23:29:01 +00:00
|
|
|
}
|
|
|
|
|
2018-04-15 15:40:20 +00:00
|
|
|
void swap(path &other) noexcept {
|
2018-04-13 23:29:01 +00:00
|
|
|
p_path.swap(other.p_path);
|
|
|
|
std::swap(p_fmt, other.p_fmt);
|
|
|
|
}
|
|
|
|
|
2018-04-13 16:57:04 +00:00
|
|
|
private:
|
2018-04-15 15:40:20 +00:00
|
|
|
static format path_fmt(format f) noexcept {
|
2018-04-14 15:46:44 +00:00
|
|
|
static const format fmts[] = {
|
|
|
|
#ifdef OSTD_PLATFORM_WIN32
|
|
|
|
format::windows,
|
|
|
|
#else
|
|
|
|
format::posix,
|
|
|
|
#endif
|
|
|
|
format::posix, format::windows
|
|
|
|
};
|
2018-04-14 19:28:01 +00:00
|
|
|
return fmts[std::size_t(f)];
|
|
|
|
}
|
|
|
|
|
2018-04-15 15:40:20 +00:00
|
|
|
static bool is_sep(char c) noexcept {
|
2018-04-14 19:28:01 +00:00
|
|
|
return ((c == '/') || (c == '\\'));
|
2018-04-14 15:46:44 +00:00
|
|
|
}
|
|
|
|
|
2018-04-15 15:40:20 +00:00
|
|
|
bool is_win() const noexcept {
|
2018-04-14 19:28:01 +00:00
|
|
|
return path_fmt(p_fmt) == format::windows;
|
2018-04-14 15:46:44 +00:00
|
|
|
}
|
|
|
|
|
2018-04-15 15:40:20 +00:00
|
|
|
static bool has_letter(string_range s) noexcept {
|
2018-04-14 19:28:01 +00:00
|
|
|
if (s.size() < 2) {
|
2018-04-14 16:03:43 +00:00
|
|
|
return false;
|
|
|
|
}
|
2018-04-14 19:28:01 +00:00
|
|
|
char ltr = s[0] | 32;
|
|
|
|
return (s[1] == ':') && (ltr >= 'a') && (ltr <= 'z');
|
|
|
|
}
|
|
|
|
|
2018-04-15 15:40:20 +00:00
|
|
|
static bool has_dslash(string_range s) noexcept {
|
2018-04-15 14:34:30 +00:00
|
|
|
if (s.size() < 2) {
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
return (s.slice(0, 2) == "\\\\");
|
|
|
|
}
|
|
|
|
|
2018-04-14 23:11:14 +00:00
|
|
|
void cleanup_str(std::string &s, char sep, bool allow_twoslash) {
|
|
|
|
std::size_t start = 0;
|
2018-04-14 19:28:01 +00:00
|
|
|
/* replace multiple separator sequences and . parts */
|
2018-04-14 21:21:58 +00:00
|
|
|
char const *p = &s[start];
|
2018-04-14 23:11:14 +00:00
|
|
|
if (allow_twoslash && is_sep(p[0]) && is_sep(p[1])) {
|
2018-04-14 19:28:01 +00:00
|
|
|
/* it's okay for windows paths to start with double backslash,
|
|
|
|
* but if it's triple or anything like that replace anyway
|
|
|
|
*/
|
2018-04-14 21:21:58 +00:00
|
|
|
start += 1;
|
2018-04-14 19:28:01 +00:00
|
|
|
++p;
|
|
|
|
}
|
|
|
|
/* special case: path starts with ./ or is simply ., erase */
|
|
|
|
if ((*p == '.') && (is_sep(p[1]) || (p[1] == '\0'))) {
|
|
|
|
s.erase(start, 2 - int(p[1] == '\0'));
|
|
|
|
}
|
|
|
|
/* replace // and /./ sequences as well as separators */
|
2018-04-15 14:34:30 +00:00
|
|
|
for (; start < s.size(); ++start) {
|
2018-04-14 19:28:01 +00:00
|
|
|
p = &s[start];
|
|
|
|
if (is_sep(*p)) {
|
|
|
|
std::size_t cnt = 0;
|
|
|
|
for (;;) {
|
2018-04-14 19:38:23 +00:00
|
|
|
if (is_sep(p[cnt + 1])) {
|
2018-04-14 19:28:01 +00:00
|
|
|
++cnt;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
if (
|
|
|
|
(p[cnt + 1] == '.') &&
|
|
|
|
(is_sep(p[cnt + 2]) || (p[cnt + 2] == '\0'))
|
|
|
|
) {
|
|
|
|
cnt += 2;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
s.replace(start, cnt + 1, 1, sep);
|
|
|
|
}
|
|
|
|
}
|
2018-04-14 23:11:14 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void strip_trailing(char sep) {
|
2018-04-15 14:34:30 +00:00
|
|
|
std::size_t plen = p_path.size();
|
2018-04-14 23:11:14 +00:00
|
|
|
if (sep == '\\') {
|
|
|
|
char const *p = p_path.data();
|
|
|
|
if ((plen <= 2) && (p[0] == '\\') && (p[1] == '\\')) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if ((plen <= 3) && has_letter(p_path)) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
} else if (plen <= 1) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (p_path.back() == sep) {
|
|
|
|
p_path.pop_back();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2018-04-15 13:17:49 +00:00
|
|
|
void append_str(std::string s, bool norm = false) {
|
2018-04-14 23:11:14 +00:00
|
|
|
char sep = separator();
|
|
|
|
bool win = is_win();
|
|
|
|
/* replace multiple separator sequences and . parts */
|
2018-04-15 13:17:49 +00:00
|
|
|
if (!norm) {
|
|
|
|
cleanup_str(s, sep, win);
|
|
|
|
}
|
2018-04-14 19:28:01 +00:00
|
|
|
/* if the path has a root, replace the previous path, otherwise
|
|
|
|
* append a separator followed by the path and be done with it
|
|
|
|
*
|
|
|
|
* if this is windows and we have a drive, it's like having a root
|
|
|
|
*/
|
|
|
|
if ((s.data()[0] == sep) || (win && has_letter(s))) {
|
|
|
|
p_path = std::move(s);
|
|
|
|
} else if (!s.empty()) {
|
|
|
|
/* empty paths are ., don't forget to clear that */
|
|
|
|
if (p_path == ".") {
|
2018-04-14 23:11:14 +00:00
|
|
|
/* empty path: replace */
|
|
|
|
p_path = std::move(s);
|
|
|
|
} else {
|
|
|
|
if (p_path.back() != sep) {
|
|
|
|
p_path.push_back(sep);
|
|
|
|
}
|
|
|
|
p_path.append(s);
|
2018-04-14 19:28:01 +00:00
|
|
|
}
|
|
|
|
}
|
2018-04-14 23:11:14 +00:00
|
|
|
strip_trailing(sep);
|
|
|
|
}
|
|
|
|
|
|
|
|
void append_concat_str(std::string s) {
|
|
|
|
char sep = separator();
|
|
|
|
/* replace multiple separator sequences and . parts */
|
|
|
|
cleanup_str(s, sep, false);
|
|
|
|
if (p_path == ".") {
|
|
|
|
/* empty path: replace */
|
|
|
|
p_path = std::move(s);
|
|
|
|
} else {
|
|
|
|
if ((p_path.back() == sep) && (s.front() == sep)) {
|
|
|
|
p_path.pop_back();
|
|
|
|
}
|
|
|
|
p_path.append(s);
|
2018-04-14 19:34:24 +00:00
|
|
|
}
|
2018-04-14 23:11:14 +00:00
|
|
|
strip_trailing(sep);
|
2018-04-14 19:28:01 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void convert_path() {
|
|
|
|
char froms = '\\', tos = '/';
|
|
|
|
if (separator() == '\\') {
|
|
|
|
froms = '/';
|
|
|
|
tos = '\\';
|
|
|
|
} else if (p_path.substr(0, 2) == "\\\\") {
|
|
|
|
p_path.replace(0, 2, 1, '/');
|
|
|
|
}
|
|
|
|
for (auto &c: p_path) {
|
|
|
|
if (c == froms) {
|
|
|
|
c = tos;
|
|
|
|
}
|
|
|
|
}
|
2018-04-14 16:03:43 +00:00
|
|
|
}
|
|
|
|
|
2018-04-15 15:40:20 +00:00
|
|
|
string_range relative_to_str(string_range other) const noexcept {
|
2018-04-15 14:34:30 +00:00
|
|
|
if (other == ".") {
|
|
|
|
return p_path;
|
|
|
|
}
|
|
|
|
std::size_t oplen = other.size();
|
|
|
|
if (string_range{p_path}.slice(0, oplen) == other) {
|
|
|
|
if ((p_path.size() > oplen) && (p_path[oplen] == separator())) {
|
|
|
|
++oplen;
|
|
|
|
}
|
|
|
|
auto sl = string_range{p_path};
|
|
|
|
return sl.slice(oplen, sl.size());
|
|
|
|
}
|
|
|
|
return nullptr;
|
|
|
|
}
|
|
|
|
|
2018-04-15 15:40:20 +00:00
|
|
|
char const *get_rootp() const noexcept {
|
2018-04-15 14:34:30 +00:00
|
|
|
char const *datap = p_path.data();
|
|
|
|
if (is_win()) {
|
|
|
|
if (*datap == '\\') {
|
|
|
|
return datap;
|
|
|
|
}
|
|
|
|
if (has_letter(p_path) && (datap[2] == '\\')) {
|
|
|
|
return datap + 2;
|
|
|
|
}
|
|
|
|
return nullptr;
|
|
|
|
}
|
|
|
|
if (*p_path.data() == '/') {
|
|
|
|
return datap;
|
|
|
|
}
|
|
|
|
return nullptr;
|
|
|
|
}
|
|
|
|
|
2018-04-13 16:57:04 +00:00
|
|
|
std::string p_path;
|
|
|
|
format p_fmt;
|
|
|
|
};
|
|
|
|
|
|
|
|
inline path operator/(path const &p1, path const &p2) {
|
|
|
|
return p1.join(p2);
|
|
|
|
}
|
|
|
|
|
2018-04-14 21:21:58 +00:00
|
|
|
inline path operator+(path const &p1, path const &p2) {
|
|
|
|
return p1.concat(p2);
|
|
|
|
}
|
|
|
|
|
2018-04-13 23:29:01 +00:00
|
|
|
template<>
|
|
|
|
struct format_traits<path> {
|
|
|
|
template<typename R>
|
|
|
|
static void to_format(path const &p, R &writer, format_spec const &fs) {
|
|
|
|
fs.format_value(writer, p.string());
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
2018-04-13 16:57:04 +00:00
|
|
|
/** @} */
|
|
|
|
|
|
|
|
} /* namespace ostd */
|
|
|
|
|
2018-04-13 23:29:01 +00:00
|
|
|
/* filesystem manipulation that relies on path representation above */
|
|
|
|
|
|
|
|
namespace ostd {
|
|
|
|
namespace fs {
|
|
|
|
|
|
|
|
/** @addtogroup Utilities
|
|
|
|
* @{
|
|
|
|
*/
|
|
|
|
|
|
|
|
OSTD_EXPORT path cwd();
|
|
|
|
OSTD_EXPORT path home();
|
|
|
|
|
|
|
|
/** @} */
|
|
|
|
|
|
|
|
} /* namesapce fs */
|
|
|
|
} /* namesapce ostd */
|
|
|
|
|
2018-04-13 16:57:04 +00:00
|
|
|
#endif
|
|
|
|
|
|
|
|
/** @} */
|