def NullPrefixOp(p, w, bp):
"""Prefix operator.
Low precedence: return, raise, etc.
return x+y is return (x+y), not (return x) + y
High precedence: logical negation, bitwise complement, etc.
!x && y is (!x) && y, not !(x && y)
"""
right = p.ParseUntil(bp)
return ast.ArithUnary(word.ArithId(w), right)
def NullUnaryMinus(p, t, bp):
""" -1, to distinguish from binary operator. """
right = p.ParseUntil(bp)
return ast.ArithUnary(Id.Node_UnaryMinus, right)