bool CDatum::IsEqual (CDatum dValue) const
// IsEqual
//
// Returns TRUE if the values are equal
{
switch (GetBasicType())
{
case typeNil:
return dValue.IsNil();
case typeTrue:
return !dValue.IsNil();
case typeInteger32:
case typeInteger64:
case typeIntegerIP:
case typeDouble:
return (dValue.IsNumber() && CNumberValue(*this).Compare(dValue) == 0);
case typeString:
return (dValue.GetBasicType() == typeString && strEquals(*this, dValue));
case typeDateTime:
return (dValue.GetBasicType() == typeDateTime && ((const CDateTime &)*this == (const CDateTime &)dValue));
// LATER
case typeArray:
case typeBinary:
case typeStruct:
case typeSymbol:
return false;
default:
ASSERT(false);
return false;
}
}
int CDatum::DefaultCompare (void *pCtx, const CDatum &dKey1, const CDatum &dKey2)
// DefaultCompare
//
// Default comparison routine used for sorting. Returns:
//
// -1: If dKey1 < dKey2
// 0: If dKey1 == dKey2
// 1: If dKey1 > dKey2
//
// NOTES:
//
// Nil == ""
// Nil == {}
// Nil == ()
// "abc" != "ABC"
{
int i;
// If both are the same datatype, then compare
CDatum::Types iType1 = dKey1.GetBasicType();
CDatum::Types iType2 = dKey2.GetBasicType();
// If both types are equal, then compare
if (iType1 == iType2)
{
switch (iType1)
{
case CDatum::typeNil:
case CDatum::typeTrue:
return 0;
case CDatum::typeInteger32:
if ((int)dKey1 > (int)dKey2)
return 1;
else if ((int)dKey1 < (int)dKey2)
return -1;
else
return 0;
case CDatum::typeInteger64:
if ((DWORDLONG)dKey1 > (DWORDLONG)dKey2)
return 1;
else if ((DWORDLONG)dKey1 < (DWORDLONG)dKey2)
return -1;
else
return 0;
case CDatum::typeDouble:
if ((double)dKey1 > (double)dKey2)
return 1;
else if ((double)dKey1 < (double)dKey2)
return -1;
else
return 0;
case CDatum::typeIntegerIP:
return KeyCompare((const CIPInteger &)dKey1, (const CIPInteger &)dKey2);
case CDatum::typeString:
return KeyCompare((const CString &)dKey1, (const CString &)dKey2);
case CDatum::typeDateTime:
return ((const CDateTime &)dKey1).Compare((const CDateTime &)dKey2);
case CDatum::typeArray:
if (dKey1.GetCount() > dKey2.GetCount())
return 1;
else if (dKey1.GetCount() < dKey2.GetCount())
return -1;
else
{
for (i = 0; i < dKey1.GetCount(); i++)
{
CDatum dItem1 = dKey1.GetElement(i);
CDatum dItem2 = dKey2.GetElement(i);
int iItemCompare = CDatum::DefaultCompare(pCtx, dItem1, dItem2);
if (iItemCompare != 0)
return iItemCompare;
}
return 0;
}
case CDatum::typeStruct:
if (dKey1.GetCount() > dKey2.GetCount())
return 1;
else if (dKey1.GetCount() < dKey2.GetCount())
return -1;
else
{
for (i = 0; i < dKey1.GetCount(); i++)
{
CString sItemKey1 = dKey1.GetKey(i);
CString sItemKey2 = dKey2.GetKey(i);
int iKeyCompare = KeyCompare(sItemKey1, sItemKey2);
if (iKeyCompare != 0)
return iKeyCompare;
CDatum dItem1 = dKey1.GetElement(i);
CDatum dItem2 = dKey2.GetElement(i);
int iItemCompare = CDatum::DefaultCompare(pCtx, dItem1, dItem2);
if (iItemCompare != 0)
return iItemCompare;
}
return 0;
}
// LATER: Not yet supported
default:
return 0;
}
}
// If one of the types is nil, then compare
else if (iType1 == CDatum::typeNil || iType2 == CDatum::typeNil)
{
CDatum dNonNil;
int iResult;
if (iType2 == CDatum::typeNil)
{
dNonNil = dKey1;
Swap(iType1, iType2);
iResult = 1;
}
else
{
dNonNil = dKey2;
iResult = -1;
}
switch (iType2)
{
case CDatum::typeString:
if (((const CString &)dNonNil).IsEmpty())
return 0;
else
return iResult;
case CDatum::typeArray:
case CDatum::typeStruct:
if (dNonNil.GetCount() == 0)
return 0;
else
return iResult;
default:
// nil is always less
return iResult;
}
}
// If one of the types is a number, then compare as numbers
else if (dKey1.IsNumber() || dKey2.IsNumber())
{
CNumberValue Number1(dKey1);
CNumberValue Number2(dKey2);
if (Number1.IsValidNumber() && Number2.IsValidNumber())
return Number1.Compare(Number2);
else if (Number1.IsValidNumber())
return 1;
else if (Number2.IsValidNumber())
return -1;
else
return 0;
}
// Otherwise, cannot compare
else
return 0;
}
CDatum::Types CDatum::GetNumberType (int *retiValue, CDatum *retdConverted) const
// GetNumberType
//
// Returns the most appropriate number type for the datum and optimistically
// returns the value if the type is integer.
//
// The number type is the best number type that the datum can be cast
// to without loss of data, following this order (from most preferable to
// least):
//
// typeInteger32
// typeDouble
// typeIntegerIP
//
// If the original datum is a string then we try to parse it and return the
// best number type. retdConverted will be a datum representing the parsed
// number.
//
// If the value cannot be converted to a number we return typeUnknown.
{
// Pre-init
if (retdConverted)
*retdConverted = *this;
switch (m_dwData & AEON_TYPE_MASK)
{
case AEON_TYPE_STRING:
{
if (m_dwData == 0)
{
if (retiValue)
*retiValue = 0;
return typeInteger32;
}
else
{
CDatum dNumberValue;
if (!CDatum::CreateFromStringValue(*this, &dNumberValue)
|| !dNumberValue.IsNumber())
return typeUnknown;
if (retdConverted)
*retdConverted = dNumberValue;
return dNumberValue.GetNumberType(retiValue);
}
}
case AEON_TYPE_NUMBER:
switch (m_dwData & AEON_NUMBER_TYPE_MASK)
{
case AEON_NUMBER_CONSTANT:
{
switch (m_dwData)
{
case constTrue:
if (retiValue)
*retiValue = 1;
return typeInteger32;
default:
ASSERT(false);
return typeUnknown;
}
}
case AEON_NUMBER_28BIT:
if (retiValue)
*retiValue = ((int)(m_dwData & AEON_NUMBER_MASK) >> 4);
return typeInteger32;
case AEON_NUMBER_32BIT:
if (retiValue)
*retiValue = (int)g_IntAlloc.Get(GetNumberIndex());
return typeInteger32;
case AEON_NUMBER_DOUBLE:
return typeDouble;
default:
ASSERT(false);
return typeUnknown;
}
case AEON_TYPE_COMPLEX:
return raw_GetComplex()->GetNumberType(retiValue);
default:
ASSERT(false);
return typeUnknown;
}
}
