66 lines
2.0 KiB
Plaintext
66 lines
2.0 KiB
Plaintext
use std::fmt;
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use std::str::{from_utf8, from_utf8_unchecked};
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#[derive(Copy,Clone,Debug,Eq,PartialEq,Ord,PartialOrd)]
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pub enum IrcCommand<'a> {
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Stringy(Stringy<'a>),
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Numeric(Numeric<'a>)
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}
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#[derive(Copy,Clone,Debug,Eq,PartialEq,Ord,PartialOrd)]
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pub struct Stringy<'a>(&'a [u8]);
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#[derive(Copy,Clone,Debug,Eq,PartialEq,Ord,PartialOrd)]
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pub struct Numeric<'a>(u16, &'a [u8; 3]);
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impl<'a> Numeric<'a> {
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// unsafe because Display uses from_utf8_unchecked
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unsafe fn new(cmd: &'a [u8; 3]) -> Numeric<'a> {
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Numeric(cmd.iter().map(|x| (x-b'0') as u16).fold(0, |x,y| x*10+y), cmd)
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}
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}
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pub trait IrcCommandCall {
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fn get_command<'a>(&'a self) -> IrcCommand<'a>;
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}
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impl<'a> fmt::Display for Stringy<'a> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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let mut i = 0;
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let l = self.0.len();
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let v = self.0;
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while i < l {
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let st = from_utf8(&v[i..]);
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if let Ok(s) = st {
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write!(f, "{}", s)?;
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} else {
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let err = st.err().unwrap();
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write!(f, "{}", unsafe { from_utf8_unchecked(&v[i..][..err.valid_up_to()])})?;
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write!(f, "\u{FFFD}")?;
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match err.error_len() {
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None => i = l,
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Some(len) => i = i + err.valid_up_to() + len
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}
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}
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}
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Ok(())
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}
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}
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impl<'a> fmt::Display for Numeric<'a> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", unsafe { from_utf8_unchecked(self.1) })
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}
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}
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impl<'a> IrcCommand<'a> {
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pub fn new(cmd: &'a [u8]) -> IrcCommand<'a> {
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if cmd.len() == 3 && matches!((cmd[0], cmd[1], cmd[2]), (b'0'...b'9', b'0'...b'9', b'0'...b'9')) {
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// TODO switch to TryFrom/TryInto once those are stable. (rust-lang/rust#33417)
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IrcCommand::Numeric(unsafe { Numeric::new(array_ref![cmd,0,3])})
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} else {
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IrcCommand::Stringy(Stringy(cmd))
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}
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}
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}
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