latex.py 文件源码

def _needs_function_brackets(self, expr):
        """
        Returns True if the expression needs to be wrapped in brackets when
        passed as an argument to a function, False otherwise. This is a more
        liberal version of _needs_brackets, in that many expressions which need
        to be wrapped in brackets when added/subtracted/raised to a power do
        not need them when passed to a function. Such an example is a*b.
        """
        if not self._needs_brackets(expr):
            return False
        else:
            # Muls of the form a*b*c... can be folded
            if expr.is_Mul and not self._mul_is_clean(expr):
                return True
            # Pows which don't need brackets can be folded
            elif expr.is_Pow and not self._pow_is_clean(expr):
                return True
            # Add and Function always need brackets
            elif expr.is_Add or expr.is_Function:
                return True
            else:
                return False