def convert_postfix()

in evaluation/latex2sympy/latex2sympy2.py [0:0]

• 35 lines of code
• 13 McCabe index (conditional complexity)

def convert_postfix(postfix):
    if hasattr(postfix, 'exp'):
        exp_nested = postfix.exp()
    else:
        exp_nested = postfix.exp_nofunc()

    exp = convert_exp(exp_nested)
    for op in postfix.postfix_op():
        if op.BANG():
            if isinstance(exp, list):
                raise Exception("Cannot apply postfix to derivative")
            exp = sympy.factorial(exp, evaluate=False)
        elif op.eval_at():
            ev = op.eval_at()
            at_b = None
            at_a = None
            if ev.eval_at_sup():
                at_b = do_subs(exp, ev.eval_at_sup())
            if ev.eval_at_sub():
                at_a = do_subs(exp, ev.eval_at_sub())
            if at_b is not None and at_a is not None:
                exp = add_flat(at_b, mul_flat(at_a, -1))
            elif at_b is not None:
                exp = at_b
            elif at_a is not None:
                exp = at_a
        elif op.transpose():
            try:
                exp = exp.T
            except:
                try:
                    exp = sympy.transpose(exp)
                except:
                    pass
                pass

    return exp