409 lines
10 KiB
C++
409 lines
10 KiB
C++
/** @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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#include <string.h>
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#include <utility>
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#include <initializer_list>
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#include <type_traits>
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#include <system_error>
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#include <ostd/platform.hh>
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#include <ostd/string.hh>
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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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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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#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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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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path(R range, format fmt = format::native): p_path("."), p_fmt(fmt) {
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if constexpr(std::is_constructible_v<std::string, R const &>) {
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append_str(std::string{range});
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} else if (!range.empty()) {
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for (auto const &elem: range) {
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append_str(std::string{elem});
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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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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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{
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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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path(path &&p):
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p_path(std::move(p.p_path)), p_fmt(p.p_fmt)
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{
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p.p_path = ".";
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}
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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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{
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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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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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path &operator=(path &&p) {
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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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char separator() const {
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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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std::string drive() const {
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if (is_win()) {
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if (p_path.substr(0, 2) == "\\\\") {
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char const *endp = strchr(p_path.data() + 2, '\\');
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if (!endp) {
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return p_path;
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}
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char const *pendp = strchr(endp, '\\');
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if (!pendp) {
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return p_path;
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}
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return std::string{p_path.data(), pendp};
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} else if (has_letter(p_path)) {
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return p_path.substr(0, 2);
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}
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}
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return "";
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}
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std::string root() const {
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if (is_win()) {
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if (
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(p_path.data()[0] == '\\') ||
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(
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(p_path.length() >= 3) &&
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(p_path[2] == '\\') && has_letter(p_path)
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)
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) {
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return "\\";
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}
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return "";
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}
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if (p_path.data()[0] == '/') {
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return "/";
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}
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return "";
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}
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std::string anchor() const {
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auto ret = drive();
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ret.append(root());
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return ret;
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}
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path parent() const {
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path rel = relative_to(anchor());
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if (rel.p_path.empty()) {
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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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std::string name() const {
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path rel = relative_to(anchor());
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auto pos = rel.p_path.rfind(separator());
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if (pos == std::string::npos) {
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return std::move(rel.p_path);
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}
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return rel.p_path.substr(pos + 1);
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}
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std::string suffix() const {
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path rel = relative_to(anchor());
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auto pos = rel.p_path.rfind('.');
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if (pos == std::string::npos) {
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return "";
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}
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return rel.p_path.substr(pos);
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}
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std::string suffixes() const {
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auto nm = name();
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auto pos = nm.find('.');
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if (pos == std::string::npos) {
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return "";
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}
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return nm.substr(pos);
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}
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std::string stem() const {
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auto nm = name();
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auto pos = nm.find('.');
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if (pos == std::string::npos) {
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return nm;
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}
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return nm.substr(0, pos);
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}
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path relative_to(path other) const {
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if (other.p_fmt != p_fmt) {
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other = path{other, p_fmt};
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}
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other.strip_sep();
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if (p_path.substr(0, other.p_path.length()) == other.p_path) {
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std::size_t oplen = other.p_path.length();
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if ((p_path.length() > oplen) && (p_path[oplen] == separator())) {
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++oplen;
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}
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return path{p_path.substr(oplen), p_fmt};
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}
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/* TODO: throw */
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return path{""};
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}
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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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append_str(p.p_path);
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return *this;
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}
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path &operator/=(path const &p) {
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return append(p);
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}
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string_range string() const {
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return p_path;
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}
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format path_format() const {
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return p_fmt;
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}
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void clear() {
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p_path = ".";
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}
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void swap(path &other) {
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p_path.swap(other.p_path);
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std::swap(p_fmt, other.p_fmt);
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}
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private:
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static format path_fmt(format f) {
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static const format fmts[] = {
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#ifdef OSTD_PLATFORM_WIN32
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format::windows,
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#else
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format::posix,
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#endif
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format::posix, format::windows
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};
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return fmts[std::size_t(f)];
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}
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static bool is_sep(char c) {
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return ((c == '/') || (c == '\\'));
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}
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bool is_win() const {
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return path_fmt(p_fmt) == format::windows;
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}
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void strip_sep() {
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if (!p_path.empty() && (p_path.back() == separator())) {
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p_path.pop_back();
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}
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}
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static bool has_letter(std::string const &s) {
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if (s.size() < 2) {
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return false;
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}
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char ltr = s[0] | 32;
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return (s[1] == ':') && (ltr >= 'a') && (ltr <= 'z');
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}
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void append_str(std::string s) {
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char sep = separator();
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bool win = is_win();
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/* replace multiple separator sequences and . parts */
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std::size_t start = 0;
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char const *p = s.data();
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if (win && is_sep(p[0]) && is_sep(p[1])) {
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/* it's okay for windows paths to start with double backslash,
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* but if it's triple or anything like that replace anyway
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*/
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start = 1;
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++p;
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}
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/* special case: path starts with ./ or is simply ., erase */
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if ((*p == '.') && (is_sep(p[1]) || (p[1] == '\0'))) {
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s.erase(start, 2 - int(p[1] == '\0'));
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}
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/* replace // and /./ sequences as well as separators */
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for (; start < s.length(); ++start) {
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p = &s[start];
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if (is_sep(*p)) {
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std::size_t cnt = 0;
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for (;;) {
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if (p[cnt + 1] == sep) {
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++cnt;
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continue;
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}
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if (
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(p[cnt + 1] == '.') &&
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(is_sep(p[cnt + 2]) || (p[cnt + 2] == '\0'))
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) {
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cnt += 2;
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continue;
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}
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break;
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}
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s.replace(start, cnt + 1, 1, sep);
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}
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}
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/* if the path has a root, replace the previous path, otherwise
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* append a separator followed by the path and be done with it
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*
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* if this is windows and we have a drive, it's like having a root
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*/
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if ((s.data()[0] == sep) || (win && has_letter(s))) {
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p_path = std::move(s);
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} else if (!s.empty()) {
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/* empty paths are ., don't forget to clear that */
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if (p_path == ".") {
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p_path.clear();
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} else if (p_path != "/") {
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p_path.push_back(sep);
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}
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p_path.append(s);
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}
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/* strip trailing separator */
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if ((p_path.length() > 1) && (p_path.back() == sep)) {
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p_path.pop_back();
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}
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}
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void convert_path() {
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char froms = '\\', tos = '/';
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if (separator() == '\\') {
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froms = '/';
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tos = '\\';
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} else if (p_path.substr(0, 2) == "\\\\") {
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p_path.replace(0, 2, 1, '/');
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}
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for (auto &c: p_path) {
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if (c == froms) {
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c = tos;
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}
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}
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}
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std::string p_path;
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format p_fmt;
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};
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inline path operator/(path const &p1, path const &p2) {
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return p1.join(p2);
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}
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template<>
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struct format_traits<path> {
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template<typename R>
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static void to_format(path const &p, R &writer, format_spec const &fs) {
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fs.format_value(writer, p.string());
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}
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};
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/** @} */
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} /* namespace ostd */
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/* filesystem manipulation that relies on path representation above */
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namespace ostd {
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namespace fs {
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/** @addtogroup Utilities
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* @{
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*/
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OSTD_EXPORT path cwd();
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OSTD_EXPORT path home();
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/** @} */
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} /* namesapce fs */
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} /* namesapce ostd */
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#endif
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/** @} */
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