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cvar.h
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cvar.h
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#ifndef CVAR_HDR
#define CVAR_HDR
#include "u_string.h"
#include "u_vector.h"
#include "u_optional.h"
enum varType {
kVarInt,
kVarFloat,
kVarString
};
enum {
kVarPersist = 1 << 0,
kVarReadOnly = 1 << 1
};
enum varStatus {
kVarSuccess = 1,
kVarRangeError,
kVarTypeError,
kVarNotFoundError,
kVarReadOnlyError
};
template <typename T>
struct varTypeTraits;
template <>
struct varTypeTraits<int> {
static constexpr varType type = kVarInt;
};
template <>
struct varTypeTraits<float> {
static constexpr varType type = kVarFloat;
};
template <>
struct varTypeTraits<u::string> {
static constexpr varType type = kVarString;
};
void varRegister(const char *name, const char *desc, void *what, varType type);
varStatus varChange(const u::string &name, const u::string &value, bool callback = false);
template <typename T>
inline void varDefine(const char *name, const char *desc, T *self) {
varRegister(name, desc, (void *)self, varTypeTraits<typename T::type>::type);
}
template <typename T>
struct var {
typedef T type;
typedef void (*command)(T&);
var(int flags, const char *name, const char *desc, const T &min, const T &max);
var(int flags, const char *name, const char *desc, const T &min, const T &max, const T &def);
var(int flags, const char *name, const char *desc, const T &min, const T &max, const T &def, command cb);
operator T&();
T &get();
const T min() const;
const T max() const;
varStatus set(const T &value);
void setMin(const T &min);
void setMax(const T &max);
void operator()();
int flags() const;
void toggle();
private:
T m_min;
T m_max;
T m_default;
T m_current;
command m_callback;
int m_flags;
};
template <>
struct var<u::string> {
typedef u::string type;
typedef void (*command)(u::string &value);
var(int flags, const char *name, const char *desc);
var(int flags, const char *name, const char *desc, const u::string &def);
var(int flags, const char *name, const char *desc, const u::string &def, command cb);
operator u::string&();
u::string &get();
varStatus set(const u::string &value);
void operator()();
int flags() const;
private:
const u::string m_default;
u::string m_current;
command m_callback;
int m_flags;
};
/// var<T>
template <typename T>
inline var<T>::var(int flags,
const char *name,
const char *desc,
const T &min,
const T &max)
: m_min(min)
, m_max(max)
, m_callback(nullptr)
, m_flags(flags)
{
varDefine(name, desc, this);
}
template <typename T>
inline var<T>::var(int flags,
const char *name,
const char *desc,
const T &min,
const T &max,
const T &def)
: m_min(min)
, m_max(max)
, m_default(def)
, m_current(def)
, m_callback(nullptr)
, m_flags(flags)
{
varDefine(name, desc, this);
}
template <typename T>
inline var<T>::var(int flags,
const char *name,
const char *desc,
const T &min,
const T &max,
const T &def,
typename var<T>::command cb)
: m_min(min)
, m_max(max)
, m_default(def)
, m_current(def)
, m_callback(cb)
, m_flags(flags)
{
varDefine(name, desc, this);
}
template <typename T>
inline var<T>::operator T&() {
return m_current;
}
template <typename T>
T &var<T>::get() {
return m_current;
}
template <typename T>
inline const T var<T>::min() const {
return m_min;
}
template <typename T>
inline const T var<T>::max() const {
return m_max;
}
template <typename T>
inline varStatus var<T>::set(const T &value) {
if (m_flags & kVarReadOnly)
return kVarReadOnlyError;
if (value < m_min)
return kVarRangeError;
if (value > m_max)
return kVarRangeError;
m_current = value;
return kVarSuccess;
}
template <typename T>
inline void var<T>::setMin(const T &min) {
m_min = min;
if (m_current < m_min)
m_current = m_min;
}
template <typename T>
inline void var<T>::setMax(const T &max) {
m_max = max;
if (m_current > m_max)
m_current = m_max;
}
template <typename T>
inline void var<T>::operator()() {
if (m_callback)
m_callback(m_current);
}
template <typename T>
inline int var<T>::flags() const {
return m_flags;
}
template <typename T>
inline void var<T>::toggle() {
m_current = !m_current;
}
/// var<u::string>
inline var<u::string>::var(int flags,
const char *name,
const char *desc,
const u::string &def)
: m_default(def)
, m_current(def)
, m_callback(nullptr)
, m_flags(flags)
{
varDefine(name, desc, this);
}
inline var<u::string>::var(int flags,
const char *name,
const char *desc)
: m_callback(nullptr)
, m_flags(flags)
{
varDefine(name, desc, this);
}
inline var<u::string>::var(int flags,
const char *name,
const char *desc,
const u::string &def,
typename var<u::string>::command cb)
: m_default(def)
, m_current(def)
, m_callback(cb)
, m_flags(flags)
{
varDefine(name, desc, this);
}
inline var<u::string>::operator u::string&() {
return m_current;
}
inline u::string &var<u::string>::get() {
return m_current;
}
inline varStatus var<u::string>::set(const u::string &value) {
if (m_flags & kVarReadOnly)
return kVarReadOnlyError;
m_current = value;
return kVarSuccess;
}
inline void var<u::string>::operator()() {
if (m_callback)
m_callback(m_current);
}
inline int var<u::string>::flags() const {
return m_flags;
}
template <typename T>
var<T> &varGet(const char *name);
u::vector<u::string> varAutoComplete(const u::string &what);
u::optional<u::string> varValue(const u::string &name);
#define VAR(TYPE, NAME, ...) \
static var<TYPE> NAME(kVarPersist, #NAME, __VA_ARGS__)
#define NVAR(TYPE, NAME, ...) \
static var<TYPE> NAME(0, #NAME, __VA_ARGS__)
bool writeConfig(const u::string &userPath);
bool readConfig(const u::string &userPath);
#endif