def to_cons(cls, object_, result_type):
"""Converts object_ to Cons.
"""
# Checks a length of sequence.
if isinstance(object_, Null):
sequence_length = 0
else:
sequence_length = len(object_.value)
# If sequence_length is zero, SIMPLE-TYPE-ERROR is occured.
if sequence_length == 0:
raise SimpleTypeError("The requested length ({}) does not match the specified type {}.".format(
str(sequence_length),
str(result_type)
))
if isinstance(object_.value, list):
return Cons.tocons(object_.value)
else: # If object_.value is not list, it is converted to list in advance.
return Cons.tocons(list(object_.value))
def eval_forms(cls, forms, var_env, func_env, macro_env):
"""Evaluates forms before these are given to functions as arguments.
Returns:
Cons.
"""
from clispy.evaluator import Evaluator
args = []
while forms is not Null():
args.append(Evaluator.eval(forms.car, var_env, func_env, macro_env))
forms = forms.cdr
return Cons.tocons(args)