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'''
ARTHIMETIC OPERATORS
This file contains Python classes that define the arithmetic operators for program synthesis.
'''
'''
CLASS DEFINITIONS
'''
class IntegerVariable:
'''
Class to represent an integer variable. Note that position is the position of the variable in the input.
For example, if the input is [4, 5, 6] and the variable is the third element (i.e., 6), then position = 2.
'''
def __init__(self, position):
self.value = None # value of the variable, initially None
self.position = position # position of the variable in the arguments to program
self.type = int # type of the variable
def assign(self, value):
self.value = value
def evaluate(self):
return self.value
def str(self):
return f"x{self.position}"
class IntegerConstant:
'''
Class to represent an integer constant.
'''
def __init__(self, value):
self.value = value # value of the constant
self.type = int # type of the constant
def evaluate(self):
return self.value
def str(self):
return str(self.value)
class Add:
'''
Operator to add two numerical values.
'''
def __init__(self):
self.arity = 2 # number of arguments
self.arg_types = [int, int] # argument types
self.return_type = int # return type
self.weight = 1 # weight
def evaluate(self, x, y):
return x + y
def str(self, x, y):
return f"({x} + {y})"
class Subtract:
'''
Operator to subtract two numerical values.
'''
def __init__(self):
self.arity = 2 # number of arguments
self.arg_types = [int, int] # argument types
self.return_type = int # return type
self.weight = 1 # weight
def evaluate(self, x, y):
return x - y
def str(self, x, y):
return f"({x} - {y})"
class Multiply:
'''
Operator to multiply two numerical values.
'''
def __init__(self):
self.arity = 2 # number of arguments
self.arg_types = [int, int] # argument types
self.return_type = int # return type
self.weight = 1 # weight
def evaluate(self, x, y):
return x * y
def str(self, x, y):
return f"({x} * {y})"
class Divide:
'''
Operator to divide two numerical values.
'''
def __init__(self):
self.arity = 2 # number of arguments
self.arg_types = [int, int] # argument types
self.return_type = int # return type
self.weight = 1 # weight
def evaluate(self, x, y):
try: # check for division by zero error
return x / y
except ZeroDivisionError:
return None
def str(self, x, y):
return f"({x} / {y})"
'''
GLOBAL CONSTANTS
'''
# define operators
arithmetic_operators = [Add(), Subtract(), Multiply(), Divide()] |