def _find_parenthesis(self, position, forward=True):
        commas = depth = 0
        document = self._text_edit.document()
        char = document.characterAt(position)
        # Search until a match is found or a non-printable character is
        # encountered.
        while category(char) != 'Cc' and position > 0:
            if char == ',' and depth == 0:
                commas += 1
            elif char == ')':
                if forward and depth == 0:
                    break
                depth += 1
            elif char == '(':
                if not forward and depth == 0:
                    break
                depth -= 1
            position += 1 if forward else -1
            char = document.characterAt(position)
        else:
            position = -1
        return position, commas
If 'forward' is True (resp. False), proceed forwards
dataset/ETHPy150Open enthought/pyface/pyface/ui/qt4/console/call_tip_widget.py/CallTipWidget._find_parenthesis