261 lines
7.9 KiB
Rust
261 lines
7.9 KiB
Rust
//! Input.
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use std::io::{self, Read, Write};
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use std::ops;
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use event::{parse_event, Event, Key};
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use raw::IntoRawMode;
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/// An iterator over input keys.
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pub struct Keys<I> {
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iter: Events<I>,
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}
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impl<I: Iterator<Item = Result<u8, io::Error>>> Iterator for Keys<I> {
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type Item = Result<Key, io::Error>;
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fn next(&mut self) -> Option<Result<Key, io::Error>> {
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loop {
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match self.iter.next() {
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Some(Ok(Event::Key(k))) => return Some(Ok(k)),
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Some(Ok(_)) => continue,
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e @ Some(Err(_)) => e,
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None => return None,
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};
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}
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}
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}
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/// An iterator over input events.
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pub struct Events<I> {
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bytes: I,
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}
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impl<I: Iterator<Item = Result<u8, io::Error>>> Iterator for Events<I> {
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type Item = Result<Event, io::Error>;
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fn next(&mut self) -> Option<Result<Event, io::Error>> {
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let ref mut iter = self.bytes;
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match iter.next() {
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Some(item) => Some(parse_event(item, iter).or(Ok(Event::Unsupported))),
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None => None,
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}
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}
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}
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/// Extension to `Read` trait.
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pub trait TermRead {
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/// An iterator over input events.
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fn events(self) -> Events<io::Bytes<Self>> where Self: Sized;
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/// An iterator over key inputs.
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fn keys(self) -> Keys<io::Bytes<Self>> where Self: Sized;
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/// Read a line.
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///
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/// EOT and ETX will abort the prompt, returning `None`. Newline or carriage return will
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/// complete the input.
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fn read_line(&mut self) -> io::Result<Option<String>>;
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/// Read a password.
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///
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/// EOT and ETX will abort the prompt, returning `None`. Newline or carriage return will
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/// complete the input.
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fn read_passwd<W: Write>(&mut self, writer: &mut W) -> io::Result<Option<String>> {
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let _raw = try!(writer.into_raw_mode());
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self.read_line()
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}
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}
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impl<R: Read> TermRead for R {
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fn events(self) -> Events<io::Bytes<R>> {
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Events {
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bytes: self.bytes(),
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}
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}
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fn keys(self) -> Keys<io::Bytes<R>> {
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Keys {
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iter: self.events(),
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}
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}
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fn read_line(&mut self) -> io::Result<Option<String>> {
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let mut buf = Vec::with_capacity(30);
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for c in self.bytes() {
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match c {
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Err(e) => return Err(e),
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Ok(0) | Ok(3) | Ok(4) => return Ok(None),
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Ok(0x7f) => { buf.pop(); },
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Ok(b'\n') | Ok(b'\r') => break,
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Ok(c) => buf.push(c),
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}
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}
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let string = try!(String::from_utf8(buf).map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e)));
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Ok(Some(string))
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}
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}
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/// A sequence of escape codes to enable terminal mouse support.
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const ENTER_MOUSE_SEQUENCE: &'static str = csi!("?1000h\x1b[?1002h\x1b[?1015h\x1b[?1006h");
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/// A sequence of escape codes to disable terminal mouse support.
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const EXIT_MOUSE_SEQUENCE: &'static str = csi!("?1006l\x1b[?1015l\x1b[?1002l\x1b[?1000l");
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/// A terminal with added mouse support.
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///
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/// This can be obtained through the `From` implementations.
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pub struct MouseTerminal<W: Write> {
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term: W,
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}
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impl<W: Write> From<W> for MouseTerminal<W> {
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fn from(mut from: W) -> MouseTerminal<W> {
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from.write(ENTER_MOUSE_SEQUENCE.as_bytes()).unwrap();
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MouseTerminal { term: from }
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}
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}
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impl<W: Write> Drop for MouseTerminal<W> {
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fn drop(&mut self) {
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self.term.write(EXIT_MOUSE_SEQUENCE.as_bytes()).unwrap();
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}
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}
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impl<W: Write> ops::Deref for MouseTerminal<W> {
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type Target = W;
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fn deref(&self) -> &W {
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&self.term
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}
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}
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impl<W: Write> ops::DerefMut for MouseTerminal<W> {
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fn deref_mut(&mut self) -> &mut W {
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&mut self.term
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}
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}
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impl<W: Write> Write for MouseTerminal<W> {
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fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
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self.term.write(buf)
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}
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fn flush(&mut self) -> io::Result<()> {
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self.term.flush()
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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use std::io;
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use event::{Key, Event, MouseEvent, MouseButton};
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#[test]
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fn test_keys() {
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let mut i = b"\x1Bayo\x7F\x1B[D".keys();
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assert_eq!(i.next().unwrap().unwrap(), Key::Alt('a'));
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assert_eq!(i.next().unwrap().unwrap(), Key::Char('y'));
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assert_eq!(i.next().unwrap().unwrap(), Key::Char('o'));
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assert_eq!(i.next().unwrap().unwrap(), Key::Backspace);
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assert_eq!(i.next().unwrap().unwrap(), Key::Left);
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assert!(i.next().is_none());
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}
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#[test]
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fn test_events() {
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let mut i = b"\x1B[\x00bc\x7F\x1B[D\
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\x1B[M\x00\x22\x24\x1B[<0;2;4;M\x1B[32;2;4M\x1B[<0;2;4;m\x1B[35;2;4Mb".events();
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assert_eq!(i.next().unwrap().unwrap(), Event::Unsupported);
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assert_eq!(i.next().unwrap().unwrap(), Event::Key(Key::Char('b')));
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assert_eq!(i.next().unwrap().unwrap(), Event::Key(Key::Char('c')));
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assert_eq!(i.next().unwrap().unwrap(), Event::Key(Key::Backspace));
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assert_eq!(i.next().unwrap().unwrap(), Event::Key(Key::Left));
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assert_eq!(i.next().unwrap().unwrap(), Event::Mouse(MouseEvent::Press(MouseButton::WheelUp, 2, 4)));
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assert_eq!(i.next().unwrap().unwrap(), Event::Mouse(MouseEvent::Press(MouseButton::Left, 2, 4)));
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assert_eq!(i.next().unwrap().unwrap(), Event::Mouse(MouseEvent::Press(MouseButton::Left, 2, 4)));
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assert_eq!(i.next().unwrap().unwrap(), Event::Mouse(MouseEvent::Release(2, 4)));
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assert_eq!(i.next().unwrap().unwrap(), Event::Mouse(MouseEvent::Release(2, 4)));
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assert_eq!(i.next().unwrap().unwrap(), Event::Key(Key::Char('b')));
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assert!(i.next().is_none());
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}
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#[test]
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fn test_function_keys() {
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let mut st = b"\x1BOP\x1BOQ\x1BOR\x1BOS".keys();
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for i in 1 .. 5 {
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assert_eq!(st.next().unwrap().unwrap(), Key::F(i));
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}
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let mut st = b"\x1B[11~\x1B[12~\x1B[13~\x1B[14~\x1B[15~\
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\x1B[17~\x1B[18~\x1B[19~\x1B[20~\x1B[21~\x1B[23~\x1B[24~".keys();
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for i in 1 .. 13 {
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assert_eq!(st.next().unwrap().unwrap(), Key::F(i));
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}
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}
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#[test]
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fn test_special_keys() {
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let mut st = b"\x1B[2~\x1B[H\x1B[7~\x1B[5~\x1B[3~\x1B[F\x1B[8~\x1B[6~".keys();
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assert_eq!(st.next().unwrap().unwrap(), Key::Insert);
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assert_eq!(st.next().unwrap().unwrap(), Key::Home);
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assert_eq!(st.next().unwrap().unwrap(), Key::Home);
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assert_eq!(st.next().unwrap().unwrap(), Key::PageUp);
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assert_eq!(st.next().unwrap().unwrap(), Key::Delete);
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assert_eq!(st.next().unwrap().unwrap(), Key::End);
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assert_eq!(st.next().unwrap().unwrap(), Key::End);
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assert_eq!(st.next().unwrap().unwrap(), Key::PageDown);
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assert!(st.next().is_none());
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}
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fn line_match(a: &str, b: Option<&str>) {
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let mut sink = io::sink();
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let line = a.as_bytes().read_line().unwrap();
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let pass = a.as_bytes().read_passwd(&mut sink).unwrap();
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// godammit rustc
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assert_eq!(line, pass);
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if let Some(l) = line {
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assert_eq!(Some(l.as_str()), b);
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} else {
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assert!(b.is_none());
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}
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}
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#[test]
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fn test_read() {
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let test1 = "this is the first test";
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let test2 = "this is the second test";
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line_match(test1, Some(test1));
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line_match(test2, Some(test2));
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}
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#[test]
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fn test_backspace() {
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line_match("this is the\x7f first\x7f\x7f test", Some("this is th fir test"));
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line_match("this is the seco\x7fnd test\x7f", Some("this is the secnd tes"));
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}
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#[test]
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fn test_end() {
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line_match("abc\nhttps://www.youtube.com/watch?v=dQw4w9WgXcQ", Some("abc"));
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line_match("hello\rhttps://www.youtube.com/watch?v=yPYZpwSpKmA", Some("hello"));
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}
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#[test]
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fn test_abort() {
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line_match("abc\x03https://www.youtube.com/watch?v=dQw4w9WgXcQ", None);
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line_match("hello\x04https://www.youtube.com/watch?v=yPYZpwSpKmA", None);
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}
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}
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