7828c3dd28
https://github.com/rust-lang/rfcs/pull/221 The current terminology of "task failure" often causes problems when writing or speaking about code. You often want to talk about the possibility of an operation that returns a Result "failing", but cannot because of the ambiguity with task failure. Instead, you have to speak of "the failing case" or "when the operation does not succeed" or other circumlocutions. Likewise, we use a "Failure" header in rustdoc to describe when operations may fail the task, but it would often be helpful to separate out a section describing the "Err-producing" case. We have been steadily moving away from task failure and toward Result as an error-handling mechanism, so we should optimize our terminology accordingly: Result-producing functions should be easy to describe. To update your code, rename any call to `fail!` to `panic!` instead. Assuming you have not created your own macro named `panic!`, this will work on UNIX based systems: grep -lZR 'fail!' . | xargs -0 -l sed -i -e 's/fail!/panic!/g' You can of course also do this by hand. [breaking-change]
130 lines
3.0 KiB
Rust
130 lines
3.0 KiB
Rust
// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// ignore-test needs networking
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extern crate extra;
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use extra::net::tcp::TcpSocketBuf;
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use std::io;
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use std::int;
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use std::io::{ReaderUtil,WriterUtil};
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enum Result {
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Nil,
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Int(int),
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Data(~[u8]),
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List(~[Result]),
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Error(String),
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Status(String)
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}
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priv fn parse_data(len: uint, io: @io::Reader) -> Result {
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let res =
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if (len > 0) {
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let bytes = io.read_bytes(len as uint);
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assert_eq!(bytes.len(), len);
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Data(bytes)
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} else {
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Data(~[])
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};
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assert_eq!(io.read_char(), '\r');
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assert_eq!(io.read_char(), '\n');
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return res;
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}
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priv fn parse_list(len: uint, io: @io::Reader) -> Result {
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let mut list: ~[Result] = ~[];
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for _ in range(0, len) {
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let v = match io.read_char() {
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'$' => parse_bulk(io),
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':' => parse_int(io),
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_ => panic!()
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};
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list.push(v);
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}
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return List(list);
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}
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priv fn chop(s: String) -> String {
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s.slice(0, s.len() - 1).to_string()
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}
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priv fn parse_bulk(io: @io::Reader) -> Result {
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match from_str::<int>(chop(io.read_line())) {
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None => panic!(),
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Some(-1) => Nil,
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Some(len) if len >= 0 => parse_data(len as uint, io),
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Some(_) => panic!()
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}
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}
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priv fn parse_multi(io: @io::Reader) -> Result {
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match from_str::<int>(chop(io.read_line())) {
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None => panic!(),
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Some(-1) => Nil,
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Some(0) => List(~[]),
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Some(len) if len >= 0 => parse_list(len as uint, io),
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Some(_) => panic!()
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}
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}
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priv fn parse_int(io: @io::Reader) -> Result {
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match from_str::<int>(chop(io.read_line())) {
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None => panic!(),
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Some(i) => Int(i)
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}
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}
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priv fn parse_response(io: @io::Reader) -> Result {
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match io.read_char() {
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'$' => parse_bulk(io),
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'*' => parse_multi(io),
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'+' => Status(chop(io.read_line())),
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'-' => Error(chop(io.read_line())),
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':' => parse_int(io),
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_ => panic!()
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}
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}
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priv fn cmd_to_string(cmd: ~[String]) -> String {
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let mut res = "*".to_string();
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res.push_str(cmd.len().to_string());
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res.push_str("\r\n");
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for s in cmd.iter() {
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res.push_str(["$".to_string(), s.len().to_string(), "\r\n".to_string(),
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(*s).clone(), "\r\n".to_string()].concat() );
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}
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res
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}
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fn query(cmd: ~[String], sb: TcpSocketBuf) -> Result {
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let cmd = cmd_to_string(cmd);
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//println!("{}", cmd);
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sb.write_str(cmd);
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let res = parse_response(@sb as @io::Reader);
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res
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}
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fn query2(cmd: ~[String]) -> Result {
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let _cmd = cmd_to_string(cmd);
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io::with_str_reader("$3\r\nXXX\r\n".to_string())(|sb| {
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let res = parse_response(@sb as @io::Reader);
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println!("{}", res);
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res
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});
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}
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pub fn main() {
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}
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