Rework input logic to remove throttling
This commit is contained in:
Timothy Warren
parent
dd9166d465
commit
ae74513e88
@ -122,40 +122,78 @@ impl Editor {
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// Terminal
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// ------------------------------------------------------------------------
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/// Convert stdin to specific keypresses
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fn read_key(&mut self) -> Option<EditorKey<char>> {
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/*
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TODO: Read 1 byte by default, and read additional bytes
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if the first byte is an escape character, to resolve the
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unintentional input throttling
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*/
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// --------------------------------------------------------------------
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// Match single character
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// --------------------------------------------------------------------
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let stdin = io::stdin();
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let stdin = stdin.lock();
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let mut in_str = String::new();
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let mut buffer = BufReader::with_capacity(4, stdin);
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buffer.read_to_string(&mut in_str).unwrap();
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let mut br = BufReader::with_capacity(5, stdin);
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let mut first_read = [0; 1];
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br.read_exact(&mut first_read);
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let first_str = String::from_utf8(first_read.to_vec());
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if first_str.is_err() {
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return None;
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}
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let first_str = first_str.unwrap();
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// Read the first character, if it isn't escape, just return it
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let mut chars = first_str.chars();
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let char = chars.next();
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if char.is_none() {
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return None;
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}
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let char = char.unwrap();
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match char {
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'\0' => return None,
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'\x1b' => (),
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'\x08' => return Some(Backspace),
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'\x7f' => return Some(Backspace),
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'\r' => return Some(Enter),
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c => return Some(OtherKey(c)),
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}
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// --------------------------------------------------------------------
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// Match escape sequence
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// --------------------------------------------------------------------
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let mut seq = [0;4];
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br.read_exact(&mut seq);
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let seq_str = String::from_utf8(seq.to_vec());
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// On error, just continue the input loop
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if seq_str.is_err() {
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return None;
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}
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let seq_str = seq_str.unwrap();
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let mut input: Vec<EditorKey<char>> = vec![];
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for char in in_str.chars() {
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for char in seq_str.chars() {
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// Since the fixed array is always filled, there
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// will be null characters. Ignore these.
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if char == '\0' {
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continue;
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}
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input.push(match char {
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'\x08' => Backspace,
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'\x7f' => Backspace,
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'\x1b' => Escape,
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'\r' => Enter,
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_ => OtherKey(char),
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});
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}
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// Since we matched Escape earlier, if the input is empty,
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// this must be the escape key
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if input.is_empty() {
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return None;
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return Some(Escape);
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}
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if input[0].eq(&Escape) {
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match input.len() {
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5 => {
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4 => {
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// Escape code of the form `^[[NM~`
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if input[4].eq(&OtherKey('~')) {
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let action = match (input[2].unwrap(), input[3].unwrap()) {
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if input[3].eq(&OtherKey('~')) {
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let action = match (input[1].unwrap(), input[2].unwrap()) {
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('1', '5') => Function('5'),
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('1', '7') => Function('6'),
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('1', '8') => Function('7'),
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@ -169,10 +207,10 @@ impl Editor {
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return Some(action);
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}
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}
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4 => {
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3 => {
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// Escape code of the form `^[[N~`
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if input[3].eq(&OtherKey('~')) {
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let action = match input[2].unwrap() {
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if input[2].eq(&OtherKey('~')) {
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let action = match input[1].unwrap() {
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'1' => HomeKey,
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'3' => DeleteKey,
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'4' => EndKey,
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@ -180,17 +218,17 @@ impl Editor {
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'6' => PageDown,
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'7' => HomeKey,
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'8' => EndKey,
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_ => input[2], // Escape,
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_ => input[1], // Escape,
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};
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return Some(action);
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}
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}
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3 => {
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match input[1] {
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2 => {
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match input[0] {
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// Escape code of the form `^[[X`
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OtherKey('[') => {
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let action = match input[2].unwrap() {
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let action = match input[1].unwrap() {
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'A' => ArrowUp,
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'B' => ArrowDown,
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'C' => ArrowRight,
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@ -199,31 +237,30 @@ impl Editor {
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'F' => EndKey,
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// Eh, just return escape otherwise
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_ => input[2], //Escape,
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_ => Escape,
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};
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return Some(action);
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}
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// Escape code of the form `^[OX`
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OtherKey('O') => {
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let action = match input[2].unwrap() {
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let action = match input[1].unwrap() {
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'H' => HomeKey,
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'F' => EndKey,
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'P' => Function('1'),
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'Q' => Function('2'),
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'R' => Function('3'),
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'S' => Function('4'),
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_ => input[2], //Escape,
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_ => Escape,
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};
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return Some(action);
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}
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_ => return Some(input[1]),
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_ => return Some(Escape),
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}
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}
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_ => return Some(input[0]),
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}
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}
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// If the character doesn't match any escape sequences, just
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// pass that character on
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@ -344,6 +381,7 @@ impl Editor {
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self.cursor_x = self.rows[self.cursor_y].chars.len();
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}
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}
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Function(_) => (),
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OtherKey(c) => {
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if c.is_ascii_control() {
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if c == ctrl_key('q') {
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@ -373,7 +411,6 @@ impl Editor {
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self.insert_char(c);
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}
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}
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_ => (),
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};
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self.quit_times = KILO_QUIT_TIMES;
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