def run_conditional(input_stream):
cond_body = take_tokens("IF", "ENDIF", input_stream)
if "ELSE" not in cond_body:
# This is a simple statement. No ELSE to contend with.
if Data.pop() == TRUE:
consume_tokens(cond_body)
else:
iftrue = take_tokens("IF", "ELSE", cond_body)
otherwise = cond_body
if Data.pop() == TRUE:
consume_tokens(iftrue)
else:
consume_tokens(otherwise)
def run_whileloop(while_loop_body):
code1_and_flag = take_tokens("WHILE", "REPEAT", while_loop_body)
code2 = while_loop_body
flag_value = TRUE
while flag_value == TRUE:
consume_tokens(copy(code1_and_flag))
if Data.pop() == TRUE:
consume_tokens(copy(code2))
else:
flag_value = FALSE
def set_or_get_variable(token, input_stream):
next_token = next(input_stream)
if next_token not in ("!", "@"):
input_stream.clear()
raise SyntaxError(
f"""Was trying to get or set '{token}', but missing ! or @""")
if next_token == "!":
Memory[token] = Data.pop()
else: # next_token == "@"
Data.push(Memory[token])
def run_doloop(word_list):
_from, _to = Data.pop(), Data.pop()
for i in range(_from, _to):
input_list = _resolve_iterator(i, copy(word_list))
consume_tokens(input_list)
