def __str__(self):
return "()"
def __len__(self):
return 0
def __getitem__(self, k):
if k < 0:
raise IndexError("negative index into list")
raise IndexError("list index out of bounds")
def map(self, fn):
return self
nil = nil() # Assignment hides the nil class; there is only one instance
def read_eval_print_loop():
"""Run a read-eval-print loop for the Brackulator language."""
global Pair, nil
from scheme_reader import Pair, nil
from scalc import calc_eval
while True:
try:
src = tokenize(input('> '))
while len(src) > 0:
expression = brack_read(src)
print(calc_eval(expression))
except (SyntaxError, ValueError, TypeError, ZeroDivisionError) as err:
def __str__(self):
return "()"
def __len__(self):
return 0
def __getitem__(self, k):
if k < 0:
raise IndexError("negative index into list")
raise IndexError("list index out of bounds")
def map(self, fn):
return self
nil = nil() # Assignment hides the nil class; there is only one instance
def read_eval_print_loop():
"""Run a read-eval-print loop for the Brackulator language."""
global Pair, nil
from scheme_reader import Pair, nil
from scalc import calc_eval
while True:
try:
src = tokenize(input('> '))
while len(src) > 0:
expression = brack_read(src)
print(calc_eval(expression))
except (SyntaxError, ValueError, TypeError, ZeroDivisionError) as err: