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use once_cell::sync::Lazy;
use syntect::easy::HighlightLines;
use syntect::highlighting::{FontStyle, Highlighter, Style, Theme, ThemeSet};
use syntect::parsing::SyntaxSet;
use super::{FontFamily, Hyphenate, TextNode, Toggle};
use crate::library::prelude::*;
use crate::source::SourceId;
use crate::syntax::{self, RedNode};
/// The lazily-loaded theme used for syntax highlighting.
static THEME: Lazy<Theme> =
Lazy::new(|| ThemeSet::load_defaults().themes.remove("InspiredGitHub").unwrap());
/// The lazily-loaded syntect syntax definitions.
static SYNTAXES: Lazy<SyntaxSet> = Lazy::new(|| SyntaxSet::load_defaults_newlines());
/// Monospaced text with optional syntax highlighting.
#[derive(Debug, Hash)]
pub struct RawNode {
/// The raw text.
pub text: EcoString,
/// Whether the node is block-level.
pub block: bool,
}
#[node(showable)]
impl RawNode {
/// The raw text's font family. Just the normal text family if `none`.
#[property(referenced)]
pub const FAMILY: Smart<FontFamily> = Smart::Custom(FontFamily::new("IBM Plex Mono"));
/// The language to syntax-highlight in.
#[property(referenced)]
pub const LANG: Option<EcoString> = None;
fn construct(_: &mut Context, args: &mut Args) -> TypResult<Content> {
Ok(Content::show(Self {
text: args.expect("text")?,
block: args.named("block")?.unwrap_or(false),
}))
}
}
impl Show for RawNode {
fn show(&self, ctx: &mut Context, styles: StyleChain) -> TypResult<Content> {
let lang = styles.get(Self::LANG).as_ref();
let foreground = THEME
.settings
.foreground
.map(Color::from)
.unwrap_or(Color::BLACK)
.into();
let args = [
Value::Str(self.text.clone()),
match lang {
Some(lang) => Value::Str(lang.clone()),
None => Value::None,
},
Value::Bool(self.block),
];
let mut content = if let Some(content) = styles.show::<Self, _>(ctx, args)? {
content
} else if matches!(
lang.map(|s| s.to_lowercase()).as_deref(),
Some("typ" | "typst")
) {
let mut seq = vec![];
let green = crate::parse::parse(&self.text);
let red = RedNode::from_root(green, SourceId::from_raw(0));
let highlighter = Highlighter::new(&THEME);
syntax::highlight_syntect(red.as_ref(), &highlighter, &mut |range, style| {
seq.push(styled(&self.text[range], foreground, style));
});
Content::sequence(seq)
} else if let Some(syntax) =
lang.and_then(|token| SYNTAXES.find_syntax_by_token(&token))
{
let mut seq = vec![];
let mut highlighter = HighlightLines::new(syntax, &THEME);
for (i, line) in self.text.lines().enumerate() {
if i != 0 {
seq.push(Content::Linebreak);
}
for (style, piece) in highlighter.highlight(line, &SYNTAXES) {
seq.push(styled(piece, foreground, style));
}
}
Content::sequence(seq)
} else {
Content::Text(self.text.clone())
};
let mut map = StyleMap::new();
map.set(TextNode::OVERHANG, false);
map.set(TextNode::HYPHENATE, Smart::Custom(Hyphenate(false)));
if let Smart::Custom(family) = styles.get(Self::FAMILY) {
map.set_family(family.clone(), styles);
}
content = content.styled_with_map(map);
if self.block {
content = Content::Block(content.pack());
}
Ok(content)
}
}
/// Style a piece of text with a syntect style.
fn styled(piece: &str, foreground: Paint, style: Style) -> Content {
let mut styles = StyleMap::new();
let mut body = Content::Text(piece.into());
let paint = style.foreground.into();
if paint != foreground {
styles.set(TextNode::FILL, paint);
}
if style.font_style.contains(FontStyle::BOLD) {
styles.set(TextNode::STRONG, Toggle);
}
if style.font_style.contains(FontStyle::ITALIC) {
styles.set(TextNode::EMPH, Toggle);
}
if style.font_style.contains(FontStyle::UNDERLINE) {
body = body.underlined();
}
body.styled_with_map(styles)
}
|
