def Eval(Operator, Oprand1, Oprand2=None):
WrnExp = None
if Operator not in {"==", "!=", ">=", "<=", ">", "<", "in", "not in"} and \
(isinstance(Oprand1, type('')) or isinstance(Oprand2, type(''))):
raise BadExpression(ERR_STRING_EXPR % Operator)
if Operator in {'in', 'not in'}:
if not isinstance(Oprand1, type('')):
Oprand1 = IntToStr(Oprand1)
if not isinstance(Oprand2, type('')):
Oprand2 = IntToStr(Oprand2)
TypeDict = {
type(0): 0,
# For python2 long type
type(sys.maxsize + 1): 0,
type(''): 1,
type(True): 2
}
EvalStr = ''
if Operator in {"!", "NOT", "not"}:
if isinstance(Oprand1, type('')):
raise BadExpression(ERR_STRING_EXPR % Operator)
EvalStr = 'not Oprand1'
elif Operator in {"~"}:
if isinstance(Oprand1, type('')):
raise BadExpression(ERR_STRING_EXPR % Operator)
EvalStr = '~ Oprand1'
else:
if Operator in {"+", "-"} and (type(True) in {
type(Oprand1), type(Oprand2)
}):
# Boolean in '+'/'-' will be evaluated but raise warning
WrnExp = WrnExpression(WRN_BOOL_EXPR)
elif type('') in {type(Oprand1), type(Oprand2)
} and not isinstance(Oprand1, type(Oprand2)):
# == between string and number/boolean will always return False, != return True
if Operator == "==":
WrnExp = WrnExpression(WRN_EQCMP_STR_OTHERS)
WrnExp.result = False
raise WrnExp
elif Operator == "!=":
WrnExp = WrnExpression(WRN_NECMP_STR_OTHERS)
WrnExp.result = True
raise WrnExp
else:
raise BadExpression(ERR_RELCMP_STR_OTHERS % Operator)
elif TypeDict[type(Oprand1)] != TypeDict[type(Oprand2)]:
if Operator in {"==", "!=", ">=", "<=", ">", "<"} and set(
(TypeDict[type(Oprand1)], TypeDict[type(Oprand2)])) == set(
(TypeDict[type(True)], TypeDict[type(0)])):
# comparison between number and boolean is allowed
pass
elif Operator in {'&', '|', '^', "and", "or"} and set(
(TypeDict[type(Oprand1)], TypeDict[type(Oprand2)])) == set(
(TypeDict[type(True)], TypeDict[type(0)])):
# bitwise and logical operation between number and boolean is allowed
pass
else:
raise BadExpression(ERR_EXPR_TYPE)
if isinstance(Oprand1, type('')) and isinstance(Oprand2, type('')):
if (Oprand1.startswith('L"') and not Oprand2.startswith('L"')) or \
(not Oprand1.startswith('L"') and Oprand2.startswith('L"')):
raise BadExpression(ERR_STRING_CMP %
(Oprand1, Operator, Oprand2))
if 'in' in Operator and isinstance(Oprand2, type('')):
Oprand2 = Oprand2.split()
EvalStr = 'Oprand1 ' + Operator + ' Oprand2'
# Local symbols used by built in eval function
Dict = {'Oprand1': Oprand1, 'Oprand2': Oprand2}
try:
Val = eval(EvalStr, {}, Dict)
except Exception as Excpt:
raise BadExpression(str(Excpt))
if Operator in {'and', 'or'}:
if Val:
Val = True
else:
Val = False
if WrnExp:
WrnExp.result = Val
raise WrnExp
return Val
def Eval(Operator, Oprand1, Oprand2 = None):
WrnExp = None
if Operator not in {"==", "!=", ">=", "<=", ">", "<", "in", "not in"} and \
(isinstance(Oprand1, type('')) or isinstance(Oprand2, type(''))):
raise BadExpression(ERR_STRING_EXPR % Operator)
if Operator in {'in', 'not in'}:
if not isinstance(Oprand1, type('')):
Oprand1 = IntToStr(Oprand1)
if not isinstance(Oprand2, type('')):
Oprand2 = IntToStr(Oprand2)
TypeDict = {
type(0) : 0,
# For python2 long type
type(sys.maxsize + 1) : 0,
type('') : 1,
type(True) : 2
}
EvalStr = ''
if Operator in {"!", "NOT", "not"}:
if isinstance(Oprand1, type('')):
raise BadExpression(ERR_STRING_EXPR % Operator)
EvalStr = 'not Oprand1'
elif Operator in {"~"}:
if isinstance(Oprand1, type('')):
raise BadExpression(ERR_STRING_EXPR % Operator)
EvalStr = '~ Oprand1'
else:
if Operator in {"+", "-"} and (type(True) in {type(Oprand1), type(Oprand2)}):
# Boolean in '+'/'-' will be evaluated but raise warning
WrnExp = WrnExpression(WRN_BOOL_EXPR)
elif type('') in {type(Oprand1), type(Oprand2)} and not isinstance(Oprand1, type(Oprand2)):
# == between string and number/boolean will always return False, != return True
if Operator == "==":
WrnExp = WrnExpression(WRN_EQCMP_STR_OTHERS)
WrnExp.result = False
raise WrnExp
elif Operator == "!=":
WrnExp = WrnExpression(WRN_NECMP_STR_OTHERS)
WrnExp.result = True
raise WrnExp
else:
raise BadExpression(ERR_RELCMP_STR_OTHERS % Operator)
elif TypeDict[type(Oprand1)] != TypeDict[type(Oprand2)]:
if Operator in {"==", "!=", ">=", "<=", ">", "<"} and set((TypeDict[type(Oprand1)], TypeDict[type(Oprand2)])) == set((TypeDict[type(True)], TypeDict[type(0)])):
# comparison between number and boolean is allowed
pass
elif Operator in {'&', '|', '^', "and", "or"} and set((TypeDict[type(Oprand1)], TypeDict[type(Oprand2)])) == set((TypeDict[type(True)], TypeDict[type(0)])):
# bitwise and logical operation between number and boolean is allowed
pass
else:
raise BadExpression(ERR_EXPR_TYPE)
if isinstance(Oprand1, type('')) and isinstance(Oprand2, type('')):
if ((Oprand1.startswith('L"') or Oprand1.startswith("L'")) and (not Oprand2.startswith('L"')) and (not Oprand2.startswith("L'"))) or \
(((not Oprand1.startswith('L"')) and (not Oprand1.startswith("L'"))) and (Oprand2.startswith('L"') or Oprand2.startswith("L'"))):
raise BadExpression(ERR_STRING_CMP % (Oprand1, Operator, Oprand2))
if 'in' in Operator and isinstance(Oprand2, type('')):
Oprand2 = Oprand2.split()
EvalStr = 'Oprand1 ' + Operator + ' Oprand2'
# Local symbols used by built in eval function
Dict = {
'Oprand1' : Oprand1,
'Oprand2' : Oprand2
}
try:
Val = eval(EvalStr, {}, Dict)
except Exception as Excpt:
raise BadExpression(str(Excpt))
if Operator in {'and', 'or'}:
if Val:
Val = True
else:
Val = False
if WrnExp:
WrnExp.result = Val
raise WrnExp
return Val
