mirror of
https://github.com/privatevoid-net/nix-super.git
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145 lines
3.3 KiB
C++
145 lines
3.3 KiB
C++
#include "canon-path.hh"
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#include "util.hh"
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#include "file-path-impl.hh"
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namespace nix {
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CanonPath CanonPath::root = CanonPath("/");
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static std::string absPathPure(std::string_view path)
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{
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return canonPathInner<UnixPathTrait>(path, [](auto &, auto &){});
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}
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CanonPath::CanonPath(std::string_view raw)
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: path(absPathPure(concatStrings("/", raw)))
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{ }
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CanonPath::CanonPath(std::string_view raw, const CanonPath & root)
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: path(absPathPure(
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raw.size() > 0 && raw[0] == '/'
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? raw
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: concatStrings(root.abs(), "/", raw)))
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{ }
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CanonPath::CanonPath(const std::vector<std::string> & elems)
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: path("/")
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{
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for (auto & s : elems)
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push(s);
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}
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std::optional<CanonPath> CanonPath::parent() const
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{
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if (isRoot()) return std::nullopt;
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return CanonPath(unchecked_t(), path.substr(0, std::max((size_t) 1, path.rfind('/'))));
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}
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void CanonPath::pop()
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{
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assert(!isRoot());
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path.resize(std::max((size_t) 1, path.rfind('/')));
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}
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bool CanonPath::isWithin(const CanonPath & parent) const
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{
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return !(
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path.size() < parent.path.size()
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|| path.substr(0, parent.path.size()) != parent.path
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|| (parent.path.size() > 1 && path.size() > parent.path.size()
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&& path[parent.path.size()] != '/'));
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}
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CanonPath CanonPath::removePrefix(const CanonPath & prefix) const
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{
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assert(isWithin(prefix));
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if (prefix.isRoot()) return *this;
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if (path.size() == prefix.path.size()) return root;
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return CanonPath(unchecked_t(), path.substr(prefix.path.size()));
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}
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void CanonPath::extend(const CanonPath & x)
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{
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if (x.isRoot()) return;
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if (isRoot())
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path += x.rel();
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else
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path += x.abs();
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}
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CanonPath CanonPath::operator / (const CanonPath & x) const
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{
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auto res = *this;
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res.extend(x);
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return res;
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}
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void CanonPath::push(std::string_view c)
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{
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assert(c.find('/') == c.npos);
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assert(c != "." && c != "..");
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if (!isRoot()) path += '/';
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path += c;
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}
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CanonPath CanonPath::operator / (std::string_view c) const
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{
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auto res = *this;
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res.push(c);
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return res;
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}
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bool CanonPath::isAllowed(const std::set<CanonPath> & allowed) const
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{
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/* Check if `this` is an exact match or the parent of an
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allowed path. */
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auto lb = allowed.lower_bound(*this);
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if (lb != allowed.end()) {
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if (lb->isWithin(*this))
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return true;
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}
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/* Check if a parent of `this` is allowed. */
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auto path = *this;
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while (!path.isRoot()) {
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path.pop();
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if (allowed.count(path))
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return true;
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}
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return false;
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}
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std::ostream & operator << (std::ostream & stream, const CanonPath & path)
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{
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stream << path.abs();
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return stream;
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}
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std::string CanonPath::makeRelative(const CanonPath & path) const
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{
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auto p1 = begin();
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auto p2 = path.begin();
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for (; p1 != end() && p2 != path.end() && *p1 == *p2; ++p1, ++p2) ;
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if (p1 == end() && p2 == path.end())
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return ".";
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else if (p1 == end())
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return std::string(p2.remaining);
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else {
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std::string res;
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while (p1 != end()) {
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++p1;
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if (!res.empty()) res += '/';
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res += "..";
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}
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if (p2 != path.end()) {
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if (!res.empty()) res += '/';
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res += p2.remaining;
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}
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return res;
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}
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}
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}
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