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memory = ["input goes here", "exit"]
input_buffer = []
data_stack = []
call_stack = []
def return_():
call_stack.pop()
def exit_():
del call_stack[:]
def write_memory(data):
memory.append(data)
def write_loop():
start = len(memory)
while True:
command = next_input()
if command == "]":
memory.append("return")
return (start,)
memory.append(command)
def next_command():
if len(call_stack) > 1:
call_stack[-1] += 1
return memory[call_stack[-1] - 1]
else:
return next_input()
def bind(index):
names[next_command()] = index
names = {"push1": lambda: (1,),
"print": lambda x: print(x),
"return": return_,
"exit": exit_,
"[": write_loop,
"bind:": bind}
def main_loop():
while True:
if not call_stack:
return
#print("call stack: %s\ndata stack: %s\nmemory: %s\n\n" % (call_stack, data_stack, memory))
#print("names: %s" % names)
#print("next command: %s" % memory[call_stack[-1]])
func = names[memory[call_stack[-1]]] # Steps 1, 2, 3
call_stack[-1] += 1 # Step 4
# Step 5 Python functions are primitives, strings (function names) are non-primitives.
if callable(func):
# Deduce number of arguments.
argindex = len(data_stack) - func.__code__.co_argcount
args = data_stack[argindex:]
del data_stack[argindex:]
data_stack.extend(func(*args) or ())
else:
call_stack.append(func) # Step 6
def next_input():
if not input_buffer:
input_buffer.extend(input("> ").split())
return input_buffer.pop(0)
def input_loop():
while True:
try:
memory[0] = next_input()
except EOFError:
break
call_stack.append(0)
main_loop()
if __name__ == "__main__":
input_loop()