forked from OctaForge/libostd
add a range type to iterate paths by parts
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de04a60251
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16518fcc83
80
ostd/path.hh
80
ostd/path.hh
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@ -29,8 +29,10 @@
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#include <system_error>
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#include <ostd/platform.hh>
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#include <ostd/range.hh>
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#include <ostd/string.hh>
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#include <ostd/format.hh>
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#include <ostd/algorithm.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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@ -42,6 +44,10 @@ namespace ostd {
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* @{
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*/
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namespace detail {
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struct path_range;
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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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@ -55,6 +61,8 @@ struct path {
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windows
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};
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using range = detail::path_range;
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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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@ -70,7 +78,7 @@ struct path {
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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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path(ostd::iter(init), fmt)
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{}
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path(path const &p):
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@ -353,6 +361,8 @@ struct path {
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std::swap(p_fmt, other.p_fmt);
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}
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range iter() const noexcept;
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private:
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static format path_fmt(format f) noexcept {
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static const format fmts[] = {
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@ -550,6 +560,74 @@ inline path operator+(path const &p1, path const &p2) {
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return p1.concat(p2);
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}
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namespace detail {
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struct path_range: input_range<path_range> {
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using range_category = forward_range_tag;
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using value_type = string_range;
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using reference = string_range;
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using size_type = std::size_t;
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path_range() = delete;
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path_range(path const &p): p_rest(p.string()) {
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string_range drive = p.drive();
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if (!drive.empty()) {
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p_current = p.anchor();
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/* windows drive without root, cut rest a character earlier so
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* that the next segment can be retrieved consistently
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*/
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if (p_current.size() == drive.size()) {
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p_rest = p_rest.slice(drive.size() - 1, p_rest.size());
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} else {
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p_rest = p_rest.slice(drive.size(), p_rest.size());
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}
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return;
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}
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string_range root = p.root();
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if (!root.empty()) {
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p_current = root;
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/* leave p_rest alone so that it begins with a separator */
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return;
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}
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auto sep = ostd::find(p_rest, p.separator());
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if (!sep.empty()) {
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p_current = string_range{p_rest.data(), sep.data()};
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} else {
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p_current = p_rest;
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}
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p_rest = p_rest.slice(p_current.size(), p_rest.size());
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}
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bool empty() const noexcept { return p_current.empty(); }
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void pop_front() noexcept {
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string_range ncur = p_rest;
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if (!ncur.empty()) {
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char sep = ncur.front();
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if (sep != '/') {
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sep = '\\';
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}
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ncur.pop_front();
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string_range nsep = ostd::find(ncur, sep);
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p_current = ncur.slice(0, ncur.size() - nsep.size());
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p_rest = nsep;
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} else {
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p_current = nullptr;
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}
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}
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string_range front() const noexcept {
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return p_current;
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}
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private:
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string_range p_current, p_rest;
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};
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}
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inline typename path::range path::iter() const noexcept {
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return typename path::range{*this};
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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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