Replace UnknownCsi with generalized Event::Unsupported (#80)

src/event.rs

@@ -12,10 +12,7 @@ pub enum Event {
     /// A mouse button press, release or wheel use at specific coordinates.
     Mouse(MouseEvent),
     /// An event that cannot currently be evaluated.
-    Unsupported,
+    Unsupported(Vec<u8>),
-    /// A CSI sequence unrecognized by termion. Does not inlude the leading `^[`.
-    UnknownCsi(Vec<u8>),
-
 }
 
 /// A mouse related event.
@@ -97,27 +94,58 @@ pub enum Key {
     Esc,
 
     #[doc(hidden)]
-    __IsNotComplete
+    __IsNotComplete,
 }
 
 /// Parse an Event from `item` and possibly subsequent bytes through `iter`.
-pub fn parse_event<I>(item: Result<u8, Error>, iter: &mut I) -> Result<Event, Error>
+pub fn parse_event<I>(item: u8, iter: &mut I) -> Result<Event, Error>
     where I: Iterator<Item = Result<u8, Error>>
 {
-    let error = Err(Error::new(ErrorKind::Other, "Could not parse an event"));
+    let error = Error::new(ErrorKind::Other, "Could not parse an event");
     match item {
-        Ok(b'\x1B') => {
+        b'\x1B' => {
+            // This is an escape character, leading a control sequence.
             Ok(match iter.next() {
                 Some(Ok(b'O')) => {
                     match iter.next() {
                         // F1-F4
                         Some(Ok(val @ b'P'...b'S')) => Event::Key(Key::F(1 + val - b'P')),
-                        _ => return error,
+                        _ => return Err(error),
                     }
                 }
                 Some(Ok(b'[')) => {
                     // This is a CSI sequence.
-                    match iter.next() {
+                    parse_csi(iter).ok_or(error)?
+                }
+                Some(Ok(c)) => {
+                    let ch = parse_utf8_char(c, iter);
+                    Event::Key(Key::Alt(try!(ch)))
+                }
+                Some(Err(_)) | None => return Err(error),
+            })
+        }
+        b'\n' | b'\r' => Ok(Event::Key(Key::Char('\n'))),
+        b'\t' => Ok(Event::Key(Key::Char('\t'))),
+        b'\x7F' => Ok(Event::Key(Key::Backspace)),
+        c @ b'\x01'...b'\x1A' => Ok(Event::Key(Key::Ctrl((c as u8 - 0x1 + b'a') as char))),
+        c @ b'\x1C'...b'\x1F' => Ok(Event::Key(Key::Ctrl((c as u8 - 0x1C + b'4') as char))),
+        b'\0' => Ok(Event::Key(Key::Null)),
+        c => {
+            Ok({
+                let ch = parse_utf8_char(c, iter);
+                Event::Key(Key::Char(try!(ch)))
+            })
+        }
+    }
+}
+
+/// Parses a CSI sequence, just after reading ^[
+///
+/// Returns None if an unrecognized sequence is found.
+fn parse_csi<I>(iter: &mut I) -> Option<Event>
+    where I: Iterator<Item = Result<u8, Error>>
+{
+    Some(match iter.next() {
         Some(Ok(b'D')) => Event::Key(Key::Left),
         Some(Ok(b'C')) => Event::Key(Key::Right),
         Some(Ok(b'A')) => Event::Key(Key::Up),
@@ -126,10 +154,12 @@ where I: Iterator<Item = Result<u8, Error>>
         Some(Ok(b'F')) => Event::Key(Key::End),
         Some(Ok(b'M')) => {
             // X10 emulation mouse encoding: ESC [ CB Cx Cy (6 characters only).
-                            let cb = iter.next().unwrap().unwrap() as i8 - 32;
+            let mut next = || iter.next().unwrap().unwrap();
+
+            let cb = next() as i8 - 32;
             // (1, 1) are the coords for upper left.
-                            let cx = (iter.next().unwrap().unwrap() as u8).saturating_sub(32) as u16;
+            let cx = next().saturating_sub(32) as u16;
-                            let cy = (iter.next().unwrap().unwrap() as u8).saturating_sub(32) as u16;
+            let cy = next().saturating_sub(32) as u16;
             Event::Mouse(match cb & 0b11 {
                 0 => {
                     if cb & 0x40 != 0 {
@@ -147,9 +177,9 @@ where I: Iterator<Item = Result<u8, Error>>
                 }
                 2 => MouseEvent::Press(MouseButton::Right, cx, cy),
                 3 => MouseEvent::Release(cx, cy),
-                                _ => return error,
+                _ => return None,
             })
-                        },
+        }
         Some(Ok(b'<')) => {
             // xterm mouse encoding:
             // ESC [ < Cb ; Cx ; Cy ; (M or m)
@@ -177,20 +207,20 @@ where I: Iterator<Item = Result<u8, Error>>
                         2 => MouseButton::Right,
                         64 => MouseButton::WheelUp,
                         65 => MouseButton::WheelDown,
-                                        _ => return error,
+                        _ => unreachable!(),
                     };
                     match c {
                         b'M' => MouseEvent::Press(button, cx, cy),
                         b'm' => MouseEvent::Release(cx, cy),
-                                        _ => return error,
+                        _ => return None,
                     }
                 }
                 32 => MouseEvent::Hold(cx, cy),
-                                _ => return error,
+                _ => return None,
             };
 
             Event::Mouse(event)
-                        },
+        }
         Some(Ok(c @ b'0'...b'9')) => {
             // Numbered escape code.
             let mut buf = Vec::new();
@@ -202,9 +232,6 @@ where I: Iterator<Item = Result<u8, Error>>
                 buf.push(c);
                 c = iter.next().unwrap().unwrap();
             }
-                            // Include the terminal char in the buffer.
-                            // We'll want it if we return an unknown sequence.
-                            buf.push(c);
 
             match c {
                 // rxvt mouse encoding:
@@ -212,8 +239,8 @@ where I: Iterator<Item = Result<u8, Error>>
                 b'M' => {
                     let str_buf = String::from_utf8(buf).unwrap();
 
-                                    // 
+                    let nums: Vec<u16> = str_buf
-                                    let nums: Vec<u16> = str_buf[..str_buf.len()-1].split(';')
+                        .split(';')
                         .map(|n| n.parse().unwrap())
                         .collect();
 
@@ -227,31 +254,31 @@ where I: Iterator<Item = Result<u8, Error>>
                         34 => MouseEvent::Press(MouseButton::Right, cx, cy),
                         35 => MouseEvent::Release(cx, cy),
                         64 => MouseEvent::Hold(cx, cy),
-                                        96 |
+                        96 | 97 => MouseEvent::Press(MouseButton::WheelUp, cx, cy),
-                                        97 => MouseEvent::Press(MouseButton::WheelUp, cx, cy),
+                        _ => return None,
-                                        _ => return Ok(Event::UnknownCsi(str_buf.into_bytes())),
                     };
 
                     Event::Mouse(event)
-                                },
+                }
                 // Special key code.
                 b'~' => {
                     let str_buf = String::from_utf8(buf).unwrap();
 
                     // This CSI sequence can be a list of semicolon-separated
                     // numbers.
-                                    let nums: Vec<u8> = str_buf[..str_buf.len()-1].split(';')
+                    let nums: Vec<u8> = str_buf
+                        .split(';')
                         .map(|n| n.parse().unwrap())
                         .collect();
 
                     if nums.is_empty() {
-                                        return Ok(Event::UnknownCsi(str_buf.into_bytes()));
+                        return None;
                     }
 
                     // TODO: handle multiple values for key modififiers (ex: values
                     // [3, 2] means Shift+Delete)
                     if nums.len() > 1 {
-                                        return Ok(Event::UnknownCsi(str_buf.into_bytes()));
+                        return None;
                     }
 
                     match nums[0] {
@@ -264,43 +291,21 @@ where I: Iterator<Item = Result<u8, Error>>
                         v @ 11...15 => Event::Key(Key::F(v - 10)),
                         v @ 17...21 => Event::Key(Key::F(v - 11)),
                         v @ 23...24 => Event::Key(Key::F(v - 12)),
-                                        _ => return Ok(Event::UnknownCsi(str_buf.into_bytes())),
+                        _ => return None,
-                                    }
-                                },
-                                _ => return Ok(Event::UnknownCsi(buf)),
-                            }
-                        },
-                        _ => return error,
                     }
                 }
-                Some(Ok(c)) => {
+                _ => return None,
-                    let ch = parse_utf8_char(c, iter);
-                    Event::Key(Key::Alt(try!(ch)))
             }
-                Some(Err(_)) | None => return error,
+        }
+        _ => return None,
     })
-        }
+
-        Ok(b'\n') | Ok(b'\r') => Ok(Event::Key(Key::Char('\n'))),
-        Ok(b'\t') => Ok(Event::Key(Key::Char('\t'))),
-        Ok(b'\x7F') => Ok(Event::Key(Key::Backspace)),
-        Ok(c @ b'\x01'...b'\x1A') => Ok(Event::Key(Key::Ctrl((c as u8 - 0x1 + b'a') as char))),
-        Ok(c @ b'\x1C'...b'\x1F') => {
-            Ok(Event::Key(Key::Ctrl((c as u8 - 0x1C + b'4') as char)))
-        }
-        Ok(b'\0') => Ok(Event::Key(Key::Null)),
-        Ok(c) => {
-            Ok({
-                let ch = parse_utf8_char(c, iter);
-                Event::Key(Key::Char(try!(ch)))
-            })
-        }
-        Err(e) => Err(e),
-    }
 }
 
 /// Parse `c` as either a single byte ASCII char or a variable size UTF-8 char.
 fn parse_utf8_char<I>(c: u8, iter: &mut I) -> Result<char, Error>
-    where I: Iterator<Item = Result<u8, Error>> {
+    where I: Iterator<Item = Result<u8, Error>>
+{
     let error = Err(Error::new(ErrorKind::Other, "Input character is not valid UTF-8"));
     if c.is_ascii() {
         Ok(c as char)
@@ -311,9 +316,11 @@ fn parse_utf8_char<I>(c: u8, iter: &mut I) -> Result<char, Error>
         loop {
             bytes.push(iter.next().unwrap().unwrap());
             if let Ok(st) = str::from_utf8(bytes) {
-                return Ok(st.chars().next().unwrap())
+                return Ok(st.chars().next().unwrap());
+            }
+            if bytes.len() >= 4 {
+                return error;
             }
-            if bytes.len() >= 4 { return error; }
         }
     }
 }

src/input.rs

@@ -3,7 +3,7 @@
 use std::io::{self, Read, Write};
 use std::ops;
 
-use event::{parse_event, Event, Key};
+use event::{self, Event, Key};
 use raw::IntoRawMode;
 
 /// An iterator over input keys.
@@ -41,7 +41,7 @@ impl<R: Read> Iterator for Events<R> {
         if let Some(c) = self.leftover {
             // we have a leftover byte, use it
             self.leftover = None;
-            return Some(parse_event(Ok(c), &mut source.bytes()).or(Ok(Event::Unsupported)));
+            return Some(parse_event(c, &mut source.bytes()));
         }
 
         // Here we read two bytes at a time. We need to distinguish between single ESC key presses,
@@ -51,15 +51,17 @@ impl<R: Read> Iterator for Events<R> {
         let mut buf = [0u8; 2];
         let res = match source.read(&mut buf) {
             Ok(0) => return None,
-            Ok(1) => match buf[0] {
+            Ok(1) => {
+                match buf[0] {
                     b'\x1B' => Ok(Event::Key(Key::Esc)),
-                c => parse_event(Ok(c), &mut source.bytes()),
+                    c => parse_event(c, &mut source.bytes()),
-            },
+                }
+            }
             Ok(2) => {
                 let mut option_iter = &mut Some(buf[1]).into_iter();
                 let result = {
                     let mut iter = option_iter.map(|c| Ok(c)).chain(source.bytes());
-                    parse_event(Ok(buf[0]), &mut iter)
+                    parse_event(buf[0], &mut iter)
                 };
                 // If the option_iter wasn't consumed, keep the byte for later.
                 self.leftover = option_iter.next();
@@ -69,10 +71,24 @@ impl<R: Read> Iterator for Events<R> {
             Err(e) => Err(e),
         };
 
-        Some(res.or(Ok(Event::Unsupported)))
+        Some(res)
     }
 }
 
+fn parse_event<I>(item: u8, iter: &mut I) -> Result<Event, io::Error>
+    where I: Iterator<Item = Result<u8, io::Error>>
+{
+    let mut buf = vec![item];
+    let result = {
+        let mut iter = iter.inspect(|byte| if let &Ok(byte) = byte {
+            buf.push(byte);
+        });
+        event::parse_event(item, &mut iter)
+    };
+    result.or(Ok(Event::Unsupported(buf)))
+}
+
+
 /// Extension to `Read` trait.
 pub trait TermRead {
     /// An iterator over input events.
@@ -105,9 +121,7 @@ impl<R: Read> TermRead for R {
         }
     }
     fn keys(self) -> Keys<Self> {
-        Keys {
+        Keys { iter: self.events() }
-            iter: self.events(),
-        }
     }
 
     fn read_line(&mut self) -> io::Result<Option<String>> {
@@ -117,13 +131,16 @@ impl<R: Read> TermRead for R {
             match c {
                 Err(e) => return Err(e),
                 Ok(0) | Ok(3) | Ok(4) => return Ok(None),
-                Ok(0x7f) => { buf.pop(); },
+                Ok(0x7f) => {
+                    buf.pop();
+                }
                 Ok(b'\n') | Ok(b'\r') => break,
                 Ok(c) => buf.push(c),
             }
         }
 
-        let string = try!(String::from_utf8(buf).map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e)));
+        let string = try!(String::from_utf8(buf)
+            .map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e)));
         Ok(Some(string))
     }
 }
@@ -200,18 +217,25 @@ mod test {
     #[test]
     fn test_events() {
         let mut i = b"\x1B[\x00bc\x7F\x1B[D\
-                    \x1B[M\x00\x22\x24\x1B[<0;2;4;M\x1B[32;2;4M\x1B[<0;2;4;m\x1B[35;2;4Mb".events();
+                    \x1B[M\x00\x22\x24\x1B[<0;2;4;M\x1B[32;2;4M\x1B[<0;2;4;m\x1B[35;2;4Mb"
+            .events();
 
-        assert_eq!(i.next().unwrap().unwrap(), Event::Unsupported);
+        assert_eq!(i.next().unwrap().unwrap(),
+                   Event::Unsupported(vec![0x1B, b'[', 0x00]));
         assert_eq!(i.next().unwrap().unwrap(), Event::Key(Key::Char('b')));
         assert_eq!(i.next().unwrap().unwrap(), Event::Key(Key::Char('c')));
         assert_eq!(i.next().unwrap().unwrap(), Event::Key(Key::Backspace));
         assert_eq!(i.next().unwrap().unwrap(), Event::Key(Key::Left));
-        assert_eq!(i.next().unwrap().unwrap(), Event::Mouse(MouseEvent::Press(MouseButton::WheelUp, 2, 4)));
+        assert_eq!(i.next().unwrap().unwrap(),
-        assert_eq!(i.next().unwrap().unwrap(), Event::Mouse(MouseEvent::Press(MouseButton::Left, 2, 4)));
+                   Event::Mouse(MouseEvent::Press(MouseButton::WheelUp, 2, 4)));
-        assert_eq!(i.next().unwrap().unwrap(), Event::Mouse(MouseEvent::Press(MouseButton::Left, 2, 4)));
+        assert_eq!(i.next().unwrap().unwrap(),
-        assert_eq!(i.next().unwrap().unwrap(), Event::Mouse(MouseEvent::Release(2, 4)));
+                   Event::Mouse(MouseEvent::Press(MouseButton::Left, 2, 4)));
-        assert_eq!(i.next().unwrap().unwrap(), Event::Mouse(MouseEvent::Release(2, 4)));
+        assert_eq!(i.next().unwrap().unwrap(),
+                   Event::Mouse(MouseEvent::Press(MouseButton::Left, 2, 4)));
+        assert_eq!(i.next().unwrap().unwrap(),
+                   Event::Mouse(MouseEvent::Release(2, 4)));
+        assert_eq!(i.next().unwrap().unwrap(),
+                   Event::Mouse(MouseEvent::Release(2, 4)));
         assert_eq!(i.next().unwrap().unwrap(), Event::Key(Key::Char('b')));
         assert!(i.next().is_none());
     }
@@ -224,7 +248,8 @@ mod test {
         }
 
         let mut st = b"\x1B[11~\x1B[12~\x1B[13~\x1B[14~\x1B[15~\
-        \x1B[17~\x1B[18~\x1B[19~\x1B[20~\x1B[21~\x1B[23~\x1B[24~".keys();
+        \x1B[17~\x1B[18~\x1B[19~\x1B[20~\x1B[21~\x1B[23~\x1B[24~"
+            .keys();
         for i in 1..13 {
             assert_eq!(st.next().unwrap().unwrap(), Key::F(i));
         }
@@ -279,14 +304,18 @@ mod test {
 
     #[test]
     fn test_backspace() {
-        line_match("this is the\x7f first\x7f\x7f test", Some("this is th fir test"));
+        line_match("this is the\x7f first\x7f\x7f test",
-        line_match("this is the seco\x7fnd test\x7f", Some("this is the secnd tes"));
+                   Some("this is th fir test"));
+        line_match("this is the seco\x7fnd test\x7f",
+                   Some("this is the secnd tes"));
     }
 
     #[test]
     fn test_end() {
-        line_match("abc\nhttps://www.youtube.com/watch?v=dQw4w9WgXcQ", Some("abc"));
+        line_match("abc\nhttps://www.youtube.com/watch?v=dQw4w9WgXcQ",
-        line_match("hello\rhttps://www.youtube.com/watch?v=yPYZpwSpKmA", Some("hello"));
+                   Some("abc"));
+        line_match("hello\rhttps://www.youtube.com/watch?v=yPYZpwSpKmA",
+                   Some("hello"));
     }
 
     #[test]