ac89bb064a
All OS and IO operations should be moved out, leaving only some misc portable pure functions. This is useful to avoid copious CPP when doing things like Windows and Emscripten ports. Newly exposed functions to break cycles: - `restoreSignals` - `updateWindowSize`
135 lines
3 KiB
C++
135 lines
3 KiB
C++
#include "canon-path.hh"
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#include "file-system.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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CanonPath CanonPath::fromCwd(std::string_view path)
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{
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return CanonPath(unchecked_t(), absPath((Path) path));
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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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