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|
use std::collections::HashMap;
use crate::{
BString, ansi, bstr, cursor,
parse::{Highlight, HighlightKind},
};
pub struct Highlighter {
pub enabled: bool,
colors: HashMap<HighlightKind, BString>,
}
#[derive(Debug)]
pub enum SetColorError {
NoSuchKeyword,
}
const CLEAR_TO_END: &bstr = b"\x1b[K";
impl Highlighter {
pub fn new() -> Self {
let mut this = Self {
enabled: false,
colors: HashMap::new(),
};
let mut sc = |a: &str, b: &str| this.set_color(a.as_bytes(), b.as_bytes()).unwrap();
use ansi::colors::*;
sc("keywords", GREEN_FG);
sc("braces", CYAN_FG);
sc("string", MAGENTA_FG);
this
}
pub fn set_color(&mut self, ident: &bstr, color: &bstr) -> Result<(), SetColorError> {
let kinds = HighlightKind::from_identifier(ident);
for kind in kinds.iter() {
self.colors.insert(*kind, color.to_vec());
}
if kinds.is_empty() {
Err(SetColorError::NoSuchKeyword)
} else {
Ok(())
}
}
pub fn color(&self, h: HighlightKind) -> &[u8] {
self.colors
.get(&h)
.map(|c| c.as_ref())
.unwrap_or(ansi::colors::RESET.as_bytes())
}
pub fn pretty_print(
&self,
bytes: &[u8],
cursor_offset: usize,
colors: Vec<Highlight>,
stdout: &mut dyn std::io::Write,
) -> std::io::Result<()> {
#[derive(PartialEq, Eq, Debug, Clone)]
struct ColorBoundary {
loc: usize,
is_end: bool,
kind: HighlightKind,
}
impl PartialOrd for ColorBoundary {
fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
Some(self.cmp(other))
}
}
impl Ord for ColorBoundary {
fn cmp(&self, other: &Self) -> std::cmp::Ordering {
match self.loc.cmp(&other.loc) {
std::cmp::Ordering::Equal => (),
ord => return ord,
}
match self.kind.cmp(&other.kind) {
std::cmp::Ordering::Equal => (),
ord => return ord,
}
self.is_end.cmp(&other.is_end)
}
}
let mut coloring: Vec<_> = colors
.into_iter()
.flat_map(|hi| {
[
ColorBoundary {
loc: hi.span.start as usize,
is_end: false,
kind: hi.kind,
},
ColorBoundary {
loc: hi.span.end as usize,
is_end: true,
kind: hi.kind,
},
]
})
.collect();
coloring.sort();
let mut coloring = &coloring[..];
let mut color_stack = Vec::new();
let mut current_color = self.color(HighlightKind::None);
let mut saved_pos = false;
stdout.write_all(CLEAR_TO_END)?;
for (i, x) in bytes.iter().cloned().enumerate() {
if i == cursor_offset {
cursor::f_save(stdout)?;
saved_pos = true;
}
while let Some(color_boundary) = coloring.first().cloned()
&& color_boundary.loc <= i
{
coloring = &coloring[1..];
if color_boundary.is_end {
color_stack.pop();
} else {
color_stack.push(color_boundary.kind);
}
let new_color =
self.color(color_stack.last().cloned().unwrap_or(HighlightKind::None));
if current_color != new_color {
stdout.write_all(new_color)?;
current_color = new_color;
}
}
if x == b'\n' {
stdout.write_all(b"\r\n")?;
stdout.write_all(CLEAR_TO_END)?;
} else {
stdout.write_all(&[x])?;
}
}
stdout.write_all(self.color(HighlightKind::None))?;
if saved_pos {
cursor::f_restore(stdout)?;
}
Ok(())
}
}
|
