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from back.tac import *
class Node(object):
pass
class Program(Node):
def __init__(self, functions, lineno = -1):
self.functions = functions
self.lineno = lineno
def eval(self,tacarray):
for function in self.functions:
function = function.eval(tacarray)
return 0
class Function(Node):
def __init__(self, name, params, statements, lineno = -1):
self.name = name
self.params = params
self.statements = statements
self.lineno = lineno
def __repr__(self):
return "<Function: %s at line %d>" % (self.name, self.lineno)
def eval(self,tacarray):
return tacarray.append(te)
class Statement(Node):
pass
class IfStatement(Statement):
def __init__(self, expression, true_statements, false_statements, lineno = -1):
self.expression = expression
self.true_statements = true_statements
self.false_statements = false_statements
self.lineno = lineno
def __repr__(self):
return "<IfStatement at line %d>" % self.lineno
def eval(self,tacarray):
return tacarray.append(te)
class WhileStatement(Statement):
def __init__(self, expression, statements, lineno = -1):
self.expression = expression
self.statements = statements
self.lineno = lineno
def __repr__(self):
return "<WhileStatement at line %d>" % self.lineno
def eval(self,tacarray):
return tacarray.append(te)
class ReturnStatement(Statement):
def __init__(self, expression, lineno = -1):
self.expression = expression
self.lineno = lineno
def __repr__(self):
return "<ReturnStatement at line %d>" % self.lineno
def eval(self,tacarray):
if isinstance(expression,Node):
expression = expression.eval(tacarray)
te = TacElem(Op.RETURN,expression)
return tacarray.append(te)
class AssignStatement(Statement):
def __init__(self, ident, expression, lineno = -1):
self.ident = ident
self.expression = expression
self.lineno = lineno
def __repr__(self):
return "<AssignStatement for %s at line %d>" % (self.ident, self.lineno)
def eval(self,tacarray):
if isinstance(expression,Node):
expression = expression.eval(tacarray)
yield self.expression
class FunctionCall(Statement):
def __init__(self, ident, arguments = [], lineno = -1):
self.ident = ident
self.arguments = arguments
self.lineno = lineno
def __repr__(self):
return "<FunctionCall for %s at line %d>" % (self.ident, self.lineno)
def eval(self,tacarray):
""" Function call will be seperated in all the Op.PARAMs first, and the
Op.CALL afterwards"""
# XXX can there be arguments with multiple expressions bla((x+y-3),z)?
# -> have to look into that, when it comes to param-number
# for every parameter create a TacElem
#for argument in self.arguments:
# if isinstance(argument,Node):
# argument = argument.eval(tacarray)
# TacElem(Op.PARAM,argument)
# in the end create the CALL-TacElem with the number of parameters
te = TacElem(Op.CALL,self.ident,len(self.arguments))
return tacarray.append(te)
class Expression(Node):
pass
class UnaryExpression(Expression):
""" Unary expressions are !x or -x ..."""
def __init__(self, op, right, lineno = -1):
self.op = op
self.right = right
self.lineno = lineno
def __repr__(self):
return "<UnaryExpression: %s(%s) at line %d>" % (self.op, self.right, self.lineno)
def eval(self,tacarray):
right = self.right
op = None
if (self.op == "not"):
op = Op.NOT
if (self.op == "minus"):
op = Op.MINUS
if op == None:
return None
if isinstance(right,Node):
right = right.eval(tacarray)
te = TacElem(op,right)
return tacarray.append(te)
class BinaryExpression(Expression):
""" Biary expression are x+y, x-y, ... """
def __init__(self, left, op, right, lineno = -1):
self.left = left
self.op = op
self.right = right
self.lineno = lineno
def __repr__(self):
return "<BinaryExpression: %s(%s, %s) at line %d>" % (self.op, self.left, self.right, self.lineno)
def eval(self,tacarray):
op = None
if (self.op == "+"):
op = Op.ADD
if (self.op == "-"):
op = Op.SUB
if (self.op == "*"):
op= Op.MUL
if (self.op == "/"):
op= Op.DIV
if (self.op == "%"):
op= Op.MOD
if (self.op == "and"):
op= Op.AND
if (self.op == "or"):
op= Op.OR
if op == None:
return None
if isinstance(left,Node):
left = left.eval(tacarray)
if isinstance(right,Node):
right = right.eval(tacarray)
te = TacElem(op,left,right)
return tacarray.append(te)
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