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Follow xparsecolor spec in escape sequences
Escape sequences in xterm are parsed according to xparsecolor. xparsecolor supports 1, 2, 3, and 4 digit hex colors. Previously, only 2 digits were supported. This also fixes a bug where "fX" was parsed as "0xf", where X is an invalid character. The response to a request for fg/bg must be a valid escape sequence. The current response uses 4-digit hex, which was previously invalid.
This commit is contained in:
rbong
Christian Duerr
parent
a8692983f5
commit
629ea247cd
2 changed files with 71 additions and 59 deletions
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@ -65,6 +65,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
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and `debug.ref_test`
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- Select until next matching bracket when double-clicking a bracket
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- Added foreground/background escape code request sequences
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- Escape sequences now support 1, 3, and 4 digit hex colors
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### Changed
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@ -24,63 +24,56 @@ use vte;
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use crate::term::color::Rgb;
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// Parse color arguments
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//
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// Expect that color argument looks like "rgb:xx/xx/xx" or "#xxxxxx"
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// Parse colors in XParseColor format
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fn xparse_color(color: &[u8]) -> Option<Rgb> {
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if !color.is_empty() && color[0] == b'#' {
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let len = color.len().saturating_sub(1);
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parse_legacy_color(&color[1..len])
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} else if color.len() >= 4 && &color[..4] == b"rgb:" {
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let len = color.len().saturating_sub(1);
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parse_rgb_color(&color[4..len])
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} else {
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None
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}
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}
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// Parse colors in `rgb:r(rrr)/g(ggg)/b(bbb)` format
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fn parse_rgb_color(color: &[u8]) -> Option<Rgb> {
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let mut iter = color.iter();
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let colors = str::from_utf8(color).ok()?.split('/').collect::<Vec<_>>();
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macro_rules! next {
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() => {
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iter.next().map(|v| *v as char)
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};
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if colors.len() != 3 {
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return None;
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}
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macro_rules! parse_hex {
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() => {{
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let mut digit: u8 = 0;
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let next = next!().and_then(|v| v.to_digit(16));
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if let Some(value) = next {
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digit = value as u8;
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}
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// Scale values instead of filling with `0`s
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let scale = |input: &str| {
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let max = u32::pow(16, input.len() as u32) - 1;
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let value = u32::from_str_radix(input, 16).ok()?;
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Some((255 * value / max) as u8)
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};
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let next = next!().and_then(|v| v.to_digit(16));
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if let Some(value) = next {
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digit <<= 4;
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digit += value as u8;
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}
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digit
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}};
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}
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Some(Rgb {
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r: scale(colors[0])?,
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g: scale(colors[1])?,
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b: scale(colors[2])?,
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})
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}
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match next!() {
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Some('r') => {
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if next!() != Some('g') {
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return None;
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}
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if next!() != Some('b') {
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return None;
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}
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if next!() != Some(':') {
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return None;
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}
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// Parse colors in `#r(rrr)g(ggg)b(bbb)` format
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fn parse_legacy_color(color: &[u8]) -> Option<Rgb> {
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let item_len = color.len() / 3;
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let r = parse_hex!();
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let val = next!();
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if val != Some('/') {
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return None;
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}
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let g = parse_hex!();
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if next!() != Some('/') {
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return None;
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}
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let b = parse_hex!();
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// Truncate/Fill to two byte precision
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let color_from_slice = |slice: &[u8]| {
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let col = usize::from_str_radix(str::from_utf8(slice).ok()?, 16).ok()? << 4;
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Some((col >> (4 * slice.len().saturating_sub(1))) as u8)
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};
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Some(Rgb { r, g, b })
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},
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Some('#') => Some(Rgb { r: parse_hex!(), g: parse_hex!(), b: parse_hex!() }),
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_ => None,
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}
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Some(Rgb {
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r: color_from_slice(&color[0..item_len])?,
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g: color_from_slice(&color[item_len..item_len * 2])?,
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b: color_from_slice(&color[item_len * 2..])?,
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})
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}
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fn parse_number(input: &[u8]) -> Option<u8> {
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@ -781,7 +774,7 @@ where
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if params.len() > 1 && params.len() % 2 != 0 {
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for chunk in params[1..].chunks(2) {
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let index = parse_number(chunk[0]);
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let color = parse_rgb_color(chunk[1]);
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let color = xparse_color(chunk[1]);
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if let (Some(i), Some(c)) = (index, color) {
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self.handler.set_color(i as usize, c);
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return;
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@ -806,7 +799,7 @@ where
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break;
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}
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if let Some(color) = parse_rgb_color(param) {
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if let Some(color) = xparse_color(param) {
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self.handler.set_color(index, color);
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} else if param == b"?" {
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self.handler.dynamic_color_sequence(writer, dynamic_code, index);
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@ -1203,7 +1196,7 @@ fn attrs_from_sgr_parameters(parameters: &[i64]) -> Vec<Option<Attr>> {
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37 => Some(Attr::Foreground(Color::Named(NamedColor::White))),
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38 => {
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let mut start = 0;
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if let Some(color) = parse_color(¶meters[i..], &mut start) {
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if let Some(color) = parse_sgr_color(¶meters[i..], &mut start) {
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i += start;
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Some(Attr::Foreground(color))
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} else {
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@ -1221,7 +1214,7 @@ fn attrs_from_sgr_parameters(parameters: &[i64]) -> Vec<Option<Attr>> {
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47 => Some(Attr::Background(Color::Named(NamedColor::White))),
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48 => {
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let mut start = 0;
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if let Some(color) = parse_color(¶meters[i..], &mut start) {
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if let Some(color) = parse_sgr_color(¶meters[i..], &mut start) {
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i += start;
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Some(Attr::Background(color))
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} else {
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@ -1256,7 +1249,7 @@ fn attrs_from_sgr_parameters(parameters: &[i64]) -> Vec<Option<Attr>> {
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}
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/// Parse a color specifier from list of attributes
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fn parse_color(attrs: &[i64], i: &mut usize) -> Option<Color> {
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fn parse_sgr_color(attrs: &[i64], i: &mut usize) -> Option<Color> {
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if attrs.len() < 2 {
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return None;
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}
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@ -1456,7 +1449,7 @@ pub mod C1 {
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#[cfg(test)]
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mod tests {
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use super::{
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parse_number, parse_rgb_color, Attr, CharsetIndex, Color, Handler, Processor,
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parse_number, xparse_color, Attr, CharsetIndex, Color, Handler, Processor,
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StandardCharset, TermInfo,
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};
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use crate::index::{Column, Line};
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@ -1623,13 +1616,31 @@ mod tests {
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}
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#[test]
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fn parse_valid_rgb_color() {
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assert_eq!(parse_rgb_color(b"rgb:11/aa/ff"), Some(Rgb { r: 0x11, g: 0xaa, b: 0xff }));
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fn parse_valid_rgb_colors() {
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assert_eq!(xparse_color(b"rgb:f/e/d\x07"), Some(Rgb { r: 0xff, g: 0xee, b: 0xdd }));
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assert_eq!(xparse_color(b"rgb:11/aa/ff\x07"), Some(Rgb { r: 0x11, g: 0xaa, b: 0xff }));
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assert_eq!(xparse_color(b"rgb:f/ed1/cb23\x07"), Some(Rgb { r: 0xff, g: 0xec, b: 0xca }));
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assert_eq!(xparse_color(b"rgb:ffff/0/0\x07"), Some(Rgb { r: 0xff, g: 0x0, b: 0x0 }));
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}
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#[test]
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fn parse_valid_rgb_color2() {
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assert_eq!(parse_rgb_color(b"#11aaff"), Some(Rgb { r: 0x11, g: 0xaa, b: 0xff }));
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fn parse_valid_legacy_rgb_colors() {
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assert_eq!(xparse_color(b"#1af\x07"), Some(Rgb { r: 0x10, g: 0xa0, b: 0xf0 }));
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assert_eq!(xparse_color(b"#11aaff\x07"), Some(Rgb { r: 0x11, g: 0xaa, b: 0xff }));
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assert_eq!(xparse_color(b"#110aa0ff0\x07"), Some(Rgb { r: 0x11, g: 0xaa, b: 0xff }));
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assert_eq!(xparse_color(b"#1100aa00ff00\x07"), Some(Rgb { r: 0x11, g: 0xaa, b: 0xff }));
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}
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#[test]
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fn parse_invalid_rgb_colors() {
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assert_eq!(xparse_color(b"rgb:0//\x07"), None);
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assert_eq!(xparse_color(b"rgb://///\x07"), None);
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}
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#[test]
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fn parse_invalid_legacy_rgb_colors() {
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assert_eq!(xparse_color(b"#\x07"), None);
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assert_eq!(xparse_color(b"#f\x07"), None);
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}
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#[test]
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