ASCIIMath2Tex frac error

[SPRCSY]

when running unit test

parser = ASCIIMath2Tex(log=False)
s = parser.translate("f(x)/g(x)")
self.assertEqual(s,r"$\frac{f(x)}{g(x)}$")

it outputs

======================================================================
FAIL: test_asciimath2tex_ok_10 (__main__.TestASCIIMath2Tex.test_asciimath2tex_ok_10)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "e:\Folder\py_asciimath\tests\test_ASCIIMath2Tex.py", line 119, in test_asciimath2tex_ok_10
    self.assertEqual(s,r"$\frac{f(x)}{g(x)}$")
AssertionError: '$f \\frac{x}{g} \\left(x\\right)$' != '$\\frac{f(x)}{g(x)}$'
- $f \frac{x}{g} \left(x\right)$
+ $\frac{f(x)}{g(x)}$

Mathjax, who renders asciimath formula, will treat $f$ and $g$ as a function symbol like $\sin$, will render f(x)/g(x) to the view $\frac{f(x)}{g(x)}$. I hope it can be fixed.