def eval_if(lists,final,count):
"""Evaluates the predicate of the 'if' condition"""
if count==0 and len(final) != 0:
expr,move=eval_expr(final),0
for i in func_dict:
if i in func_dict[i]:
move=1
if move==1:
if expr==0:
lists=if_cons_alt(ops.rest1(lists),[],0)
else:lists=if_cons_alt(ops.rest1(lists),[],0)
if expr==1:return lists[0],1
else:return lists[1],0
if ops.first(lists).isalpha():
final=ops.append(final,[local_dict[ops.first(lists)]])
return eval_if(ops.rest(lists),final,count)
if ops.first(lists)=='(':
count+=1
return eval_if(ops.rest(lists),ops.append(final,[ops.first(lists)]),count)
elif ops.first(lists)==')':
count=count-1
return eval_if(ops.rest(lists),ops.append(final,[ops.first(lists)]),count)
else:return eval_if(ops.rest(lists),ops.append(final,[ops.first(lists)]),count)
def evaluate(lists,final):
"""Performs arithmetic and logical operations"""
if ops.null(lists):return final[0]
elif ops.first(lists)=='(':return evaluate(ops.rest(lists),final)
elif ops.first(lists).isdigit():return evaluate(ops.rest(lists),ops.append(final,[int(ops.first(lists))]))
elif ops.first(lists)==')':
op=opdet(final)
if op=='+':f=add
elif op=='*':f=mul
elif op=='/':f=div
elif op=='-':f=sub
elif op=='%':f=mod
elif op=='>':f=gt
elif op=='and':f=and_
elif op=='<':f=lt
elif op=='=':f=eq
result=ops.last(final)
final=ops.rest1(final)
while type(ops.last(final))==int:
result=int(f(ops.last(final),result))
final=ops.rest1(final)
final=ops.rest1(final)
return evaluate(ops.rest(lists),ops.append(final,[result]))
else:return evaluate(ops.rest(lists),ops.append(final,[ops.first(lists)]))
def opdet(dummy): """Determines the operator""" if type(ops.last(dummy))==int:return opdet(ops.rest1(dummy)) else:return ops.last(dummy)
def gravity(lists):
"""Initial function for checking the current input"""
if lists[1]=='if':return if_begin_eval(lists)
elif lists[1]=='define' and lists[2]=='(':
eval_define(ops.rest(ops.rest(lists)))
return 'Environement created'
elif lists[1]=='define':
create_env(ops.rest(ops.rest(lists)))
return 'Environement created '
elif lists[1].isalpha() and lists[1] in func_dict:return exec_call(lists[1],ops.rest(ops.rest1(lists)))
else:
lists=from_env(lists)
return evaluate(lists,[])
def create_localenv(lists): """Creates the environement for the function""" func_dict[ops.first(ops.rest(lists))]=ops.rest(ops.rest(ops.rest1(ops.rest1(lists))))
