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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#ifndef cmDefinitions_h
#define cmDefinitions_h
#include "cmConfigure.h" // IWYU pragma: keep
#include <string>
#include <unordered_map>
#include <vector>
#include "cmLinkedTree.h"
/** \class cmDefinitions
* \brief Store a scope of variable definitions for CMake language.
*
* This stores the state of variable definitions (set or unset) for
* one scope. Sets are always local. Gets search parent scopes
* transitively and save results locally.
*/
class cmDefinitions
{
typedef cmLinkedTree<cmDefinitions>::iterator StackIter;
public:
static const std::string* Get(const std::string& key, StackIter begin,
StackIter end);
static void Raise(const std::string& key, StackIter begin, StackIter end);
static bool HasKey(const std::string& key, StackIter begin, StackIter end);
/** Set (or unset if null) a value associated with a key. */
void Set(const std::string& key, const char* value);
std::vector<std::string> UnusedKeys() const;
static std::vector<std::string> ClosureKeys(StackIter begin, StackIter end);
static cmDefinitions MakeClosure(StackIter begin, StackIter end);
private:
// String with existence boolean.
struct Def : public std::string
{
private:
typedef std::string std_string;
public:
Def() = default;
Def(const char* v)
: std_string(v ? v : "")
, Exists(v ? true : false)
{
}
Def(const std_string& v)
: std_string(v)
, Exists(true)
{
}
bool Exists = false;
bool Used = false;
};
static Def NoDef;
typedef std::unordered_map<std::string, Def> MapType;
MapType Map;
static Def const& GetInternal(const std::string& key, StackIter begin,
StackIter end, bool raise);
};
#endif
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