expr.py 文件源码

def boolean_operations(self):
        if len(self.expr.values) != 2:
            raise StructureException("Expected two arguments for a bool op", self.expr)
        left = Expr.parse_value_expr(self.expr.values[0], self.context)
        right = Expr.parse_value_expr(self.expr.values[1], self.context)
        if not is_base_type(left.typ, 'bool') or not is_base_type(right.typ, 'bool'):
            raise TypeMismatchException("Boolean operations can only be between booleans!", self.expr)
        if isinstance(self.expr.op, ast.And):
            op = 'and'
        elif isinstance(self.expr.op, ast.Or):
            op = 'or'
        else:
            raise Exception("Unsupported bool op: " + self.expr.op)
        return LLLnode.from_list([op, left, right], typ='bool', pos=getpos(self.expr))

    # Unary operations (only "not" supported)