forked from lix-project/lix
110 lines
2.3 KiB
C++
110 lines
2.3 KiB
C++
#pragma once
|
|
|
|
#include "sync.hh"
|
|
#include "hash.hh"
|
|
#include "eval.hh"
|
|
|
|
#include <variant>
|
|
|
|
namespace nix::eval_cache {
|
|
|
|
class AttrDb;
|
|
class AttrCursor;
|
|
|
|
class EvalCache : public std::enable_shared_from_this<EvalCache>
|
|
{
|
|
friend class AttrCursor;
|
|
|
|
std::shared_ptr<AttrDb> db;
|
|
EvalState & state;
|
|
typedef std::function<Value *()> RootLoader;
|
|
RootLoader rootLoader;
|
|
RootValue value;
|
|
|
|
Value * getRootValue();
|
|
|
|
public:
|
|
|
|
EvalCache(
|
|
bool useCache,
|
|
const Hash & fingerprint,
|
|
EvalState & state,
|
|
RootLoader rootLoader);
|
|
|
|
std::shared_ptr<AttrCursor> getRoot();
|
|
};
|
|
|
|
enum AttrType {
|
|
Placeholder = 0,
|
|
FullAttrs = 1,
|
|
String = 2,
|
|
Missing = 3,
|
|
Misc = 4,
|
|
Failed = 5,
|
|
Bool = 6,
|
|
};
|
|
|
|
struct placeholder_t {};
|
|
struct missing_t {};
|
|
struct misc_t {};
|
|
struct failed_t {};
|
|
typedef uint64_t AttrId;
|
|
typedef std::pair<AttrId, Symbol> AttrKey;
|
|
typedef std::variant<std::vector<Symbol>, std::string, placeholder_t, missing_t, misc_t, failed_t, bool> AttrValue;
|
|
|
|
class AttrCursor : public std::enable_shared_from_this<AttrCursor>
|
|
{
|
|
friend class EvalCache;
|
|
|
|
ref<EvalCache> root;
|
|
typedef std::optional<std::pair<std::shared_ptr<AttrCursor>, Symbol>> Parent;
|
|
Parent parent;
|
|
RootValue _value;
|
|
std::optional<std::pair<AttrId, AttrValue>> cachedValue;
|
|
|
|
AttrKey getKey();
|
|
|
|
Value & getValue();
|
|
|
|
public:
|
|
|
|
AttrCursor(
|
|
ref<EvalCache> root,
|
|
Parent parent,
|
|
Value * value = nullptr,
|
|
std::optional<std::pair<AttrId, AttrValue>> && cachedValue = {});
|
|
|
|
std::vector<Symbol> getAttrPath() const;
|
|
|
|
std::vector<Symbol> getAttrPath(Symbol name) const;
|
|
|
|
std::string getAttrPathStr() const;
|
|
|
|
std::string getAttrPathStr(Symbol name) const;
|
|
|
|
std::shared_ptr<AttrCursor> maybeGetAttr(Symbol name);
|
|
|
|
std::shared_ptr<AttrCursor> maybeGetAttr(std::string_view name);
|
|
|
|
std::shared_ptr<AttrCursor> getAttr(Symbol name);
|
|
|
|
std::shared_ptr<AttrCursor> getAttr(std::string_view name);
|
|
|
|
std::shared_ptr<AttrCursor> findAlongAttrPath(const std::vector<Symbol> & attrPath);
|
|
|
|
std::string getString();
|
|
|
|
bool getBool();
|
|
|
|
std::vector<Symbol> getAttrs();
|
|
|
|
bool isDerivation();
|
|
|
|
Value & forceValue();
|
|
|
|
/* Force creation of the .drv file in the Nix store. */
|
|
StorePath forceDerivation();
|
|
};
|
|
|
|
}
|