def cb_op_plusminus(tokens):
tokens = tokens[0]
if len(tokens) == 3:
# binary op
assert isinstance(tokens[0], AstNode)
assert isinstance(tokens[2], AstNode)
op, args = tokens[1], [tokens[0], tokens[2]]
elif len(tokens) > 3:
args = [tokens.pop(0)]
i = 0
while i < len(tokens):
op = tokens[i]
arg = tokens[i+1]
i += 2
if op == '-':
arg = -arg
elif op == '+':
pass
else:
raise ValueError("Bad operator")
args.append(arg)
op = '+'
else:
raise ValueError("Parsing error")
assert all(isinstance(arg, AstNode) for arg in args)
result = AstOp(op, *args)
return result
def cb_op_mul(tokens):
tokens = tokens[0]
assert len(tokens) == 3
assert isinstance(tokens[0], AstNode)
assert isinstance(tokens[2], AstNode)
# binary op
op, args = tokens[1], [tokens[0], tokens[2]]
result = AstOp(op, *args)
return result
def merge_ops(tokens, op):
args = []
if len(tokens) >= 3:
args = [tokens.pop(0)]
i = 0
while i < len(tokens):
op_tmp = tokens[i]
arg = tokens[i+1]
i += 2
if op_tmp != op:
raise ValueError("Bad operator")
args.append(arg)
result = AstOp(op, *args)
return result
def cb_deref_pinc(tokens):
assert len(tokens) == 1
result = AstOp('autoinc', *tokens)
return result
def cb_op_div(tokens):
tokens = tokens[0]
assert len(tokens) == 3
assert tokens[1] == "/"
result = AstOp("/", tokens[0], tokens[2])
return result
def cb_op_not(tokens):
tokens = tokens[0]
assert len(tokens) == 2
assert tokens[0] == "!"
result = AstOp("!", tokens[1])
return result
def cb_postinc(tokens):
assert len(tokens) == 1
result = AstMem(AstOp('postinc', tokens[0]), 32)
return result
def cb_predec(tokens):
assert len(tokens) == 1
result = AstMem(AstOp('predec', tokens[0]), 32)
return result