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Lambda Expressions #3

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Lambda Expressions #3

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56 changes: 56 additions & 0 deletions A1/submission/part1.py
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,62 @@ def minimum_cost_member_of_extension(self):
def version_space_size(self):
assert False, "implement as part of homework"

# Lambda calculus
class Application(Expression):
def __init__(self, exp1, exp2):
self.exp1 = exp1
self.exp2 = exp2

def pretty_print(self, indent, bool_ind, bool_nln):
ret_string = ""
if bool_ind:
for x in range(indent):
ret_string += tab
ret_string += "(" + self.exp1.pretty_print(indent, False, False) + ") " + self.exp2.pretty_print(indent, False, True)
if bool_nln:
ret_string += "\n"
return ret_string

def evaluate(self, environment):
assert False, "not implemented"

class Lambda(Expression):
def __init__(self, var, exp):
self.var = var # type: NumberVariable
self.exp = exp # type: Expression

def pretty_print(self, indent, bool_ind, bool_nln):
ret_string = ""
if bool_ind:
for x in range(indent):
ret_string += tab
ret_string += "lambda " + self.var.pretty_print(indent, False, False) + " = " + self.exp1.pretty_print(indent, False, False) + " in\n" + self.exp2.pretty_print(indent + 1, True, True)
if bool_nln:
ret_string += "\n"
return ret_string

def evaluate(self, environment):
assert False, "not implemented"
class Let(Expression):
def __init__(self, var, exp1, exp2):
self.var = var
self.exp1 = exp1
self.exp2 = exp2

def pretty_print(self, indent, bool_ind, bool_nln):
ret_string = ""
if bool_ind:
for x in range(indent):
ret_string += tab
ret_string += "let " + self.var.pretty_print(indent, False, False) + " = " + self.exp1.pretty_print(indent, False, False) + " in\n" + self.exp2.pretty_print(indent + 1, True, True)
if bool_nln:
ret_string += "\n"
return ret_string

def evaluate(self, environment):
assert False, "not implemented"


class FALSE(Expression):
return_type = "bool"
argument_types = []
Expand Down