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103 lines
2.3 KiB
C++
103 lines
2.3 KiB
C++
#include "canon-path.hh"
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#include "util.hh"
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namespace nix {
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CanonPath CanonPath::root = CanonPath("/");
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CanonPath::CanonPath(std::string_view raw)
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: path(absPath((Path) raw, "/"))
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{ }
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CanonPath::CanonPath(std::string_view raw, const CanonPath & root)
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: path(absPath((Path) raw, root.abs()))
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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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}
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