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Changed code #4

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Changed code #4

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4433102
more efficient
Apr 2, 2018
f0134d8
added error handling for loops
Apr 2, 2018
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16 changes: 12 additions & 4 deletions brainfuck.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,10 +17,11 @@ def execute(filename):
def evaluate(code):
code = cleanup(list(code))
bracemap = buildbracemap(code)
len_code = len(code)

cells, codeptr, cellptr = [0], 0, 0

while codeptr < len(code):
while codeptr < len_code:
command = code[codeptr]

if command == ">":
Expand Down Expand Up @@ -54,9 +55,16 @@ def buildbracemap(code):
for position, command in enumerate(code):
if command == "[": temp_bracestack.append(position)
if command == "]":
start = temp_bracestack.pop()
bracemap[start] = position
bracemap[position] = start
if len(temp_bracestack) > 0: # error handling
start = temp_bracestack.pop()
bracemap[start] = position
bracemap[position] = start
else:
sys.stdout.write("error: missing [\n")
sys.exit(1)
if len(temp_bracestack) > 0: # error handling
sys.stdout.write("error: missing ]\n")
sys.exit(1)
return bracemap


Expand Down