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use error::*; use simplisp::Environment as LispEnvironment; use simplisp::ExecutionTreeNode; use simplisp::ExecutionTreeObject; use simplisp::Result as LispResult; use simplisp::WrapError; pub unsafe fn repeat<TEnvironment>( environment: &TEnvironment, lisp_environment: &mut LispEnvironment<TEnvironment>, args: Vec<&ExecutionTreeObject>) -> LispResult<ExecutionTreeObject> { let func_name = "repeat".to_string(); let num_args = 3; let mut arg_index = 0; let mut rest = args.into_iter(); let first_arg = { match rest.next() { Some(first_arg) => try!(lisp_environment.evaluate(environment, &first_arg)), None => { let err: Error = ErrorKind::LispArgNotFound(func_name, arg_index, num_args).into(); return err.wrap_error_to_err(); }, } }; arg_index += 1; let second_arg = { match rest.next() { Some(second_arg) => try!(lisp_environment.evaluate(environment, &second_arg)), None => { let err: Error = ErrorKind::LispArgNotFound(func_name, arg_index, num_args).into(); return err.wrap_error_to_err(); }, } }; arg_index += 1; if let Some(_) = rest.next() { let err: Error = ErrorKind::LispExtraArgFound(func_name, num_args, arg_index + 1).into(); return err.wrap_error_to_err(); } match first_arg { ExecutionTreeObject::I8(first) => repeat_internal(environment, lisp_environment, first as u64, second_arg), ExecutionTreeObject::I16(first) => repeat_internal(environment, lisp_environment, first as u64, second_arg), ExecutionTreeObject::I32(first) => repeat_internal(environment, lisp_environment, first as u64, second_arg), ExecutionTreeObject::I64(first) => repeat_internal(environment, lisp_environment, first as u64, second_arg), ExecutionTreeObject::ISize(first) => repeat_internal(environment, lisp_environment, first as u64, second_arg), ExecutionTreeObject::U8(first) => repeat_internal(environment, lisp_environment, first as u64, second_arg), ExecutionTreeObject::U16(first) => repeat_internal(environment, lisp_environment, first as u64, second_arg), ExecutionTreeObject::U32(first) => repeat_internal(environment, lisp_environment, first as u64, second_arg), ExecutionTreeObject::U64(first) => repeat_internal(environment, lisp_environment, first as u64, second_arg), ExecutionTreeObject::USize(first) => repeat_internal(environment, lisp_environment, first as u64, second_arg), _ => { let err: Error = ErrorKind::Msg("Cannot repeat. Try passing an integer then an expression.".to_string()).into(); err.wrap_error_to_err() } } } unsafe fn repeat_internal<TEnvironment>( environment: &TEnvironment, lisp_environment: &mut LispEnvironment<TEnvironment>, repeats: u64, expression: ExecutionTreeObject) -> LispResult<ExecutionTreeObject> { let mut result = Vec::new(); for _ in 0..repeats { result.push(try!(lisp_environment.evaluate(environment, &expression))); } Ok(ExecutionTreeObject::Node(ExecutionTreeNode::new(result))) }