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use iced_core as core;
use crate::core::text::highlighter::{self, Format};
use crate::core::{Color, Font};
use once_cell::sync::Lazy;
use std::ops::Range;
use syntect::highlighting;
use syntect::parsing;
static SYNTAXES: Lazy<parsing::SyntaxSet> =
Lazy::new(parsing::SyntaxSet::load_defaults_nonewlines);
static THEMES: Lazy<highlighting::ThemeSet> =
Lazy::new(highlighting::ThemeSet::load_defaults);
const LINES_PER_SNAPSHOT: usize = 50;
pub struct Highlighter {
syntax: &'static parsing::SyntaxReference,
highlighter: highlighting::Highlighter<'static>,
caches: Vec<(parsing::ParseState, parsing::ScopeStack)>,
current_line: usize,
}
impl highlighter::Highlighter for Highlighter {
type Settings = Settings;
type Highlight = Highlight;
type Iterator<'a> =
Box<dyn Iterator<Item = (Range<usize>, Self::Highlight)> + 'a>;
fn new(settings: &Self::Settings) -> Self {
let syntax = SYNTAXES
.find_syntax_by_token(&settings.extension)
.unwrap_or_else(|| SYNTAXES.find_syntax_plain_text());
let highlighter = highlighting::Highlighter::new(
&THEMES.themes[settings.theme.key()],
);
let parser = parsing::ParseState::new(syntax);
let stack = parsing::ScopeStack::new();
Highlighter {
syntax,
highlighter,
caches: vec![(parser, stack)],
current_line: 0,
}
}
fn update(&mut self, new_settings: &Self::Settings) {
self.syntax = SYNTAXES
.find_syntax_by_token(&new_settings.extension)
.unwrap_or_else(|| SYNTAXES.find_syntax_plain_text());
self.highlighter = highlighting::Highlighter::new(
&THEMES.themes[new_settings.theme.key()],
);
// Restart the highlighter
self.change_line(0);
}
fn change_line(&mut self, line: usize) {
let snapshot = line / LINES_PER_SNAPSHOT;
if snapshot <= self.caches.len() {
self.caches.truncate(snapshot);
self.current_line = snapshot * LINES_PER_SNAPSHOT;
} else {
self.caches.truncate(1);
self.current_line = 0;
}
let (parser, stack) =
self.caches.last().cloned().unwrap_or_else(|| {
(
parsing::ParseState::new(self.syntax),
parsing::ScopeStack::new(),
)
});
self.caches.push((parser, stack));
}
fn highlight_line(&mut self, line: &str) -> Self::Iterator<'_> {
if self.current_line / LINES_PER_SNAPSHOT >= self.caches.len() {
let (parser, stack) =
self.caches.last().expect("Caches must not be empty");
self.caches.push((parser.clone(), stack.clone()));
}
self.current_line += 1;
let (parser, stack) =
self.caches.last_mut().expect("Caches must not be empty");
let ops = parser.parse_line(line, &SYNTAXES).unwrap_or_default();
let highlighter = &self.highlighter;
Box::new(
ScopeRangeIterator {
ops,
line_length: line.len(),
index: 0,
last_str_index: 0,
}
.filter_map(move |(range, scope)| {
let _ = stack.apply(&scope);
if range.is_empty() {
None
} else {
Some((
range,
Highlight(
highlighter.style_mod_for_stack(&stack.scopes),
),
))
}
}),
)
}
fn current_line(&self) -> usize {
self.current_line
}
}
#[derive(Debug, Clone, PartialEq)]
pub struct Settings {
pub theme: Theme,
pub extension: String,
}
pub struct Highlight(highlighting::StyleModifier);
impl Highlight {
pub fn color(&self) -> Option<Color> {
self.0.foreground.map(|color| {
Color::from_rgba8(color.r, color.g, color.b, color.a as f32 / 255.0)
})
}
pub fn font(&self) -> Option<Font> {
None
}
pub fn to_format(&self) -> Format<Font> {
Format {
color: self.color(),
font: self.font(),
}
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Theme {
SolarizedDark,
Base16Mocha,
Base16Ocean,
Base16Eighties,
InspiredGitHub,
}
impl Theme {
pub const ALL: &'static [Self] = &[
Self::SolarizedDark,
Self::Base16Mocha,
Self::Base16Ocean,
Self::Base16Eighties,
Self::InspiredGitHub,
];
pub fn is_dark(self) -> bool {
match self {
Self::SolarizedDark
| Self::Base16Mocha
| Self::Base16Ocean
| Self::Base16Eighties => true,
Self::InspiredGitHub => false,
}
}
fn key(self) -> &'static str {
match self {
Theme::SolarizedDark => "Solarized (dark)",
Theme::Base16Mocha => "base16-mocha.dark",
Theme::Base16Ocean => "base16-ocean.dark",
Theme::Base16Eighties => "base16-eighties.dark",
Theme::InspiredGitHub => "InspiredGitHub",
}
}
}
impl std::fmt::Display for Theme {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Theme::SolarizedDark => write!(f, "Solarized Dark"),
Theme::Base16Mocha => write!(f, "Mocha"),
Theme::Base16Ocean => write!(f, "Ocean"),
Theme::Base16Eighties => write!(f, "Eighties"),
Theme::InspiredGitHub => write!(f, "Inspired GitHub"),
}
}
}
pub struct ScopeRangeIterator {
ops: Vec<(usize, parsing::ScopeStackOp)>,
line_length: usize,
index: usize,
last_str_index: usize,
}
impl Iterator for ScopeRangeIterator {
type Item = (std::ops::Range<usize>, parsing::ScopeStackOp);
fn next(&mut self) -> Option<Self::Item> {
if self.index > self.ops.len() {
return None;
}
let next_str_i = if self.index == self.ops.len() {
self.line_length
} else {
self.ops[self.index].0
};
let range = self.last_str_index..next_str_i;
self.last_str_index = next_str_i;
let op = if self.index == 0 {
parsing::ScopeStackOp::Noop
} else {
self.ops[self.index - 1].1.clone()
};
self.index += 1;
Some((range, op))
}
}
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