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Standardize helper structures to simplify the registration of constants and also to reduce compilation times and executable size.

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Sandu Liviu Catalin 2016-11-23 00:57:55 +02:00
parent 873438d8e0
commit 4287498600
1 changed files with 180 additions and 0 deletions
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180
include/sqrat/sqratConst.h
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@ -40,6 +40,146 @@
namespace Sqrat {
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Helper to remember the type of the constant.
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
enum ConstType
{
SQET_STRING = 0,
SQET_INT = 1,
SQET_REAL = 2,
SQET_BOOL = 3
};
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Helper class that represents an enumeration value. Used to reduce compilation times and executable size.
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
struct EnumElement
{
// The name of the constant
const SQChar * Name;
// The value of the constant
union {
const SQChar * mSTR;
const SQInteger mINT;
const SQFloat mREAL;
const bool mBOOL;
};
// The type of the constant value
const unsigned short Type;
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Constructors that can identify the type and perform the proper conversion.
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
EnumElement(const SQChar * name, const SQChar * value)
: Name(name), mSTR(value), Type(SQET_STRING)
{ /* ... */ }
EnumElement(const SQChar * name, bool value)
: Name(name), mBOOL(value), Type(SQET_BOOL)
{ /* ... */ }
EnumElement(const SQChar * name, signed char value)
: Name(name), mINT(static_cast< SQInteger >(value)), Type(SQET_INT)
{ /* ... */ }
EnumElement(const SQChar * name, unsigned char value)
: Name(name), mINT(static_cast< SQInteger >(value)), Type(SQET_INT)
{ /* ... */ }
EnumElement(const SQChar * name, signed short value)
: Name(name), mINT(static_cast< SQInteger >(value)), Type(SQET_INT)
{ /* ... */ }
EnumElement(const SQChar * name, unsigned short value)
: Name(name), mINT(static_cast< SQInteger >(value)), Type(SQET_INT)
{ /* ... */ }
EnumElement(const SQChar * name, signed int value)
: Name(name), mINT(static_cast< SQInteger >(value)), Type(SQET_INT)
{ /* ... */ }
EnumElement(const SQChar * name, unsigned int value)
: Name(name), mINT(static_cast< SQInteger >(value)), Type(SQET_INT)
{ /* ... */ }
EnumElement(const SQChar * name, signed long value)
: Name(name), mINT(static_cast< SQInteger >(value)), Type(SQET_INT)
{ /* ... */ }
EnumElement(const SQChar * name, unsigned long value)
: Name(name), mINT(static_cast< SQInteger >(value)), Type(SQET_INT)
{ /* ... */ }
EnumElement(const SQChar * name, signed long long value)
: Name(name), mINT(static_cast< SQInteger >(value)), Type(SQET_INT)
{ /* ... */ }
EnumElement(const SQChar * name, unsigned long long value)
: Name(name), mINT(static_cast< SQInteger >(value)), Type(SQET_INT)
{ /* ... */ }
EnumElement(const SQChar * name, float value)
: Name(name), mREAL(static_cast< SQFloat >(value)), Type(SQET_REAL)
{ /* ... */ }
EnumElement(const SQChar * name, double value)
: Name(name), mREAL(static_cast< SQFloat >(value)), Type(SQET_REAL)
{ /* ... */ }
template < typename T > EnumElement(const SQChar * name, T value)
: Name(name), mINT(static_cast< SQInteger >(value)), Type(SQET_INT)
{ /* ... */ }
};
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// HHelper class that represents an enumeration. Used to reduce compilation times and executable size.
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
struct EnumElements
{
// The name of the enumeration if this is an enumeration otherwise null
const SQChar * Name;
// The constant values
const EnumElement * Values;
// The number of values
const unsigned int Count;
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Constructor that can identify the number of values at compile-time.
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template < size_t N > EnumElements(const EnumElement(&values)[N])
: EnumElements(nullptr, values, N)
{ /* ... */ }
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Constructor that takes an explicit number of values at run-time.
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
EnumElements(const EnumElement * values, unsigned int count)
: EnumElements(nullptr, values, count)
{ /* ... */ }
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Constructor that can identify the number of values at compile-time.
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template < size_t N > EnumElements(const SQChar * name, const EnumElement(&values)[N])
: EnumElements(name, values, N)
{ /* ... */ }
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Constructor that takes an explicit number of values at run-time.
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
EnumElements(const SQChar * name, const EnumElement * values, unsigned int count)
: Name(name), Values(values), Count(count)
{ /* ... */ }
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Register the managed constants into the specified constants table.
///
/// \remarks
/// The constants table could be either the main constants table or an enumeration.
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template < typename T > void Bind(T & table) const
{
for (unsigned int i = 0; i < Count; ++i)
{
switch (Values[i].Type)
{
case SQET_STRING: table.Const(Values[i].Name, Values[i].mSTR); break;
case SQET_INT: table.Const(Values[i].Name, Values[i].mINT); break;
case SQET_REAL: table.Const(Values[i].Name, Values[i].mREAL); break;
case SQET_BOOL: table.Const(Values[i].Name, Values[i].mBOOL); break;
default: SQTHROW(table.GetVM(), "Unknown constant value type");
}
}
}
};
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Facilitates exposing a C++ enumeration to Squirrel
///
@ -228,6 +368,46 @@ public:
}
};
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Register a dynamic amount of enumerations into the constants table.
///
/// \remarks
/// The number of enumerations have to be manually specified.
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
inline void RegisterEnumerationsPtr(HSQUIRRELVM vm, const EnumElements * elist, unsigned int count)
{
// Grab a reference to the constants table
ConstTable ct(vm);
// Iterate over the specified enumerations
for (unsigned int i = 0; i < count; ++i)
{
// Validate the enumeration name
if (!(elist[i].Name ) || *(elist[i].Name) == '\0')
{
SQTHROW(vm, _SC("Invalid or empty enumeration name"));
}
// Prepare an enumeration table
Enumeration e(vm);
// Bind the enumeration values
elist[i].Bind(e);
// Bind the enumeration to the constant table
ct.Enum(elist[i].Name, e);
}
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// Register a specific amount of enumerations identified at compile-time into the constants table.
///
/// \remarks
/// The number of enumerations will be automatically detected.
///
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
template < size_t N > inline void RegisterEnumerations(HSQUIRRELVM vm, const EnumElements(&elist)[N])
{
RegisterEnumerationsPtr(vm, elist, N); // Just forward the information
}
}
#endif