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Reuse syntaxes and themes lazily in iced_highlighter

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This commit is contained in:
Héctor Ramón Jiménez 2023-09-19 21:57:09 +02:00
parent d9fbecf0d8
commit a9ee8f62fd
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GPG key ID: 7CC46565708259A7
2 changed files with 26 additions and 26 deletions
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1
highlighter/Cargo.toml
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@ -13,4 +13,5 @@ keywords.workspace = true
[dependencies]
iced_core.workspace = true
once_cell.workspace = true
syntect.workspace = true

51
highlighter/src/lib.rs
View file

@ -3,20 +3,26 @@ 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 {
syntaxes: parsing::SyntaxSet,
syntax: parsing::SyntaxReference,
theme: highlighting::Theme,
syntax: &'static parsing::SyntaxReference,
highlighter: highlighting::Highlighter<'static>,
caches: Vec<(parsing::ParseState, parsing::ScopeStack)>,
current_line: usize,
}
const LINES_PER_SNAPSHOT: usize = 50;
impl highlighter::Highlighter for Highlighter {
type Settings = Settings;
type Highlight = Highlight;
@ -25,40 +31,33 @@ impl highlighter::Highlighter for Highlighter {
Box<dyn Iterator<Item = (Range<usize>, Self::Highlight)> + 'a>;
fn new(settings: &Self::Settings) -> Self {
let syntaxes = parsing::SyntaxSet::load_defaults_nonewlines();
let syntax = syntaxes
let syntax = SYNTAXES
.find_syntax_by_token(&settings.extension)
.unwrap_or_else(|| syntaxes.find_syntax_plain_text());
.unwrap_or_else(|| SYNTAXES.find_syntax_plain_text());
let theme = highlighting::ThemeSet::load_defaults()
.themes
.remove(settings.theme.key())
.unwrap();
let highlighter = highlighting::Highlighter::new(
&THEMES.themes[settings.theme.key()],
);
let parser = parsing::ParseState::new(syntax);
let stack = parsing::ScopeStack::new();
Highlighter {
syntax: syntax.clone(),
syntaxes,
theme,
syntax,
highlighter,
caches: vec![(parser, stack)],
current_line: 0,
}
}
fn update(&mut self, new_settings: &Self::Settings) {
self.syntax = self
.syntaxes
self.syntax = SYNTAXES
.find_syntax_by_token(&new_settings.extension)
.unwrap_or_else(|| self.syntaxes.find_syntax_plain_text())
.clone();
.unwrap_or_else(|| SYNTAXES.find_syntax_plain_text());
self.theme = highlighting::ThemeSet::load_defaults()
.themes
.remove(new_settings.theme.key())
.unwrap();
self.highlighter = highlighting::Highlighter::new(
&THEMES.themes[new_settings.theme.key()],
);
// Restart the highlighter
self.change_line(0);
@ -99,9 +98,9 @@ impl highlighter::Highlighter for Highlighter {
let (parser, stack) =
self.caches.last_mut().expect("Caches must not be empty");
let ops = parser.parse_line(line, &self.syntaxes).unwrap_or_default();
let ops = parser.parse_line(line, &SYNTAXES).unwrap_or_default();
let highlighter = highlighting::Highlighter::new(&self.theme);
let highlighter = &self.highlighter;
Box::new(
ScopeRangeIterator {