def setup(A, B):
""" Prepares two Patterns, A & B, for correct use in operands"""
#A, B = copy(A), copy(B)
cls = Base.Dominant(A, B)
A, B = cls(A), cls(B)
length = LCM(len(A), len(B))
A.stretch(length)
B.stretch(length)
return A, B
def __call__(self, A, B):
""" A is always a pattern.
"""
# If the first pattern is empty, return the other as a pattern
if len(A) == 0:
return Base.Pattern(B)
# Get the dominant pattern type and convert B
cls = Base.Dominant(A, B)
A = cls(A)
B = cls(B)
# Calculate total length before operations
i, length = 0, LCM(len(A), len(B))
P1 = []
while i < length:
try:
val = self.operate(A[i], B[i])
except ZeroDivisionError:
val = 0
P1.append(val)
i += 1
return cls(P1)
