298 lines
14 KiB
Rust
298 lines
14 KiB
Rust
use crate::panes::AnsiCode;
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use std::convert::TryFrom;
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pub fn parse_sgr_color(params: &mut dyn Iterator<Item = u16>) -> Option<AnsiCode> {
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match params.next() {
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Some(2) => Some(AnsiCode::RgbCode((
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u8::try_from(params.next()?).ok()?,
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u8::try_from(params.next()?).ok()?,
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u8::try_from(params.next()?).ok()?,
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))),
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Some(5) => Some(AnsiCode::ColorIndex(u8::try_from(params.next()?).ok()?)),
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_ => None,
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}
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}
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/// Parse colors in XParseColor format.
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pub fn xparse_color(color: &[u8]) -> Option<AnsiCode> {
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if !color.is_empty() && color[0] == b'#' {
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parse_legacy_color(&color[1..])
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} else if color.len() >= 4 && &color[..4] == b"rgb:" {
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parse_rgb_color(&color[4..])
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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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pub fn parse_rgb_color(color: &[u8]) -> Option<AnsiCode> {
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let colors = std::str::from_utf8(color)
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.ok()?
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.split('/')
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.collect::<Vec<_>>();
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if colors.len() != 3 {
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return None;
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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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if input.len() > 4 {
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None
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} else {
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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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};
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Some(AnsiCode::RgbCode((
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scale(colors[0])?,
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scale(colors[1])?,
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scale(colors[2])?,
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)))
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}
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/// Parse colors in `#r(rrr)g(ggg)b(bbb)` format.
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pub fn parse_legacy_color(color: &[u8]) -> Option<AnsiCode> {
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let item_len = color.len() / 3;
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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(std::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(AnsiCode::RgbCode((
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color_from_slice(&color[0..item_len])?,
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color_from_slice(&color[item_len..item_len * 2])?,
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color_from_slice(&color[item_len * 2..])?,
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)))
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}
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pub fn parse_number(input: &[u8]) -> Option<u8> {
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if input.is_empty() {
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return None;
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}
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let mut num: u8 = 0;
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for c in input {
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let c = *c as char;
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if let Some(digit) = c.to_digit(10) {
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num = match num.checked_mul(10).and_then(|v| v.checked_add(digit as u8)) {
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Some(v) => v,
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None => return None,
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}
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} else {
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return None;
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}
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}
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Some(num)
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}
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// these functions are copied verbatim (with slight modifications) from alacritty, mainly in order
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// to be able to use the VTE API provided by their great package of the same name more easily
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// The following license refers to this file and the functions
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// within it only
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//
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// Apache License
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// Version 2.0, January 2004
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// http://www.apache.org/licenses/
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//
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