mirror of
https://github.com/typst/typst
synced 2025-05-13 12:36:23 +08:00
309 lines
9.3 KiB
Rust
309 lines
9.3 KiB
Rust
use once_cell::sync::Lazy;
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use syntect::highlighting as synt;
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use typst::syntax::{self, LinkedNode};
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use super::{
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FallbackList, FontFamily, Hyphenate, LinebreakNode, SmartQuoteNode, TextNode,
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TextSize,
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};
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use crate::layout::BlockNode;
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use crate::prelude::*;
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/// Raw text with optional syntax highlighting.
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///
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/// Displays the text verbatim and in a monospace font. This is typically used
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/// to embed computer code into your document.
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///
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/// ## Syntax
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/// This function also has dedicated syntax. You can enclose text in 1 or 3+
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/// backticks (`` ` ``) to make it raw. Two backticks produce empty raw text.
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/// When you use three or more backticks, you can additionally specify a
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/// language tag for syntax highlighting directly after the opening backticks.
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/// Within raw blocks, everything is rendered as is, in particular, there are no
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/// escape sequences.
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///
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/// ## Example
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/// ````example
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/// Adding `rbx` to `rcx` gives
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/// the desired result.
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///
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/// ```rust
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/// fn main() {
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/// println!("Hello World!");
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/// }
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/// ```
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/// ````
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///
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/// Display: Raw Text / Code
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/// Category: text
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#[node(Prepare, Show, Finalize)]
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pub struct RawNode {
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/// The raw text.
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///
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/// You can also use raw blocks creatively to create custom syntaxes for
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/// your automations.
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///
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/// ````example
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/// // Parse numbers in raw blocks with the
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/// // `mydsl` tag and sum them up.
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/// #show raw.where(lang: "mydsl"): it => {
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/// let sum = 0
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/// for part in it.text.split("+") {
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/// sum += int(part.trim())
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/// }
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/// sum
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/// }
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///
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/// ```mydsl
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/// 1 + 2 + 3 + 4 + 5
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/// ```
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/// ````
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#[positional]
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#[required]
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pub text: EcoString,
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/// Whether the raw text is displayed as a separate block.
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///
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/// ````example
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/// // Display inline code in a small box
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/// // that retains the correct baseline.
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/// #show raw.where(block: false): box.with(
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/// fill: luma(240),
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/// inset: (x: 3pt, y: 0pt),
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/// outset: (y: 3pt),
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/// radius: 2pt,
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/// )
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///
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/// // Display block code in a larger block
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/// // with more padding.
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/// #show raw.where(block: true): block.with(
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/// fill: luma(240),
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/// inset: 10pt,
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/// radius: 4pt,
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/// )
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///
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/// With `rg`, you can search through your files quickly.
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///
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/// ```bash
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/// rg "Hello World"
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/// ```
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/// ````
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#[named]
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#[default(false)]
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pub block: bool,
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/// The language to syntax-highlight in.
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///
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/// Apart from typical language tags known from Markdown, this supports the
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/// `{"typ"}` and `{"typc"}` tags for Typst markup and Typst code,
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/// respectively.
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///
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/// ````example
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/// ```typ
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/// This is *Typst!*
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/// ```
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/// ````
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#[settable]
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#[default]
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pub lang: Option<EcoString>,
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}
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impl Prepare for RawNode {
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fn prepare(
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&self,
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_: &mut Vt,
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mut this: Content,
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styles: StyleChain,
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) -> SourceResult<Content> {
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this.push_field("lang", styles.get(Self::LANG).clone());
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Ok(this)
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}
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}
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impl Show for RawNode {
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fn show(&self, _: &mut Vt, _: &Content, styles: StyleChain) -> SourceResult<Content> {
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let text = self.text();
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let lang = styles.get(Self::LANG).as_ref().map(|s| s.to_lowercase());
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let foreground = THEME
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.settings
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.foreground
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.map(to_typst)
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.map_or(Color::BLACK, Color::from)
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.into();
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let mut realized = if matches!(lang.as_deref(), Some("typ" | "typst" | "typc")) {
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let root = match lang.as_deref() {
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Some("typc") => syntax::parse_code(&text),
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_ => syntax::parse(&text),
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};
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let mut seq = vec![];
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let highlighter = synt::Highlighter::new(&THEME);
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highlight_themed(
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&LinkedNode::new(&root),
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vec![],
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&highlighter,
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&mut |node, style| {
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seq.push(styled(&text[node.range()], foreground, style));
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},
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);
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Content::sequence(seq)
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} else if let Some(syntax) =
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lang.and_then(|token| SYNTAXES.find_syntax_by_token(&token))
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{
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let mut seq = vec![];
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let mut highlighter = syntect::easy::HighlightLines::new(syntax, &THEME);
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for (i, line) in text.lines().enumerate() {
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if i != 0 {
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seq.push(LinebreakNode::new().pack());
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}
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for (style, piece) in
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highlighter.highlight_line(line, &SYNTAXES).into_iter().flatten()
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{
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seq.push(styled(piece, foreground, style));
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}
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}
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Content::sequence(seq)
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} else {
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TextNode::packed(text)
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};
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if self.block() {
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realized = BlockNode::new().with_body(realized).pack();
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}
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Ok(realized)
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}
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}
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impl Finalize for RawNode {
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fn finalize(&self, realized: Content) -> Content {
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let mut map = StyleMap::new();
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map.set(TextNode::OVERHANG, false);
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map.set(TextNode::HYPHENATE, Hyphenate(Smart::Custom(false)));
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map.set(TextNode::SIZE, TextSize(Em::new(0.8).into()));
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map.set(
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TextNode::FAMILY,
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FallbackList(vec![FontFamily::new("DejaVu Sans Mono")]),
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);
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map.set(SmartQuoteNode::ENABLED, false);
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realized.styled_with_map(map)
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}
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}
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/// Highlight a syntax node in a theme by calling `f` with ranges and their
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/// styles.
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fn highlight_themed<F>(
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node: &LinkedNode,
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scopes: Vec<syntect::parsing::Scope>,
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highlighter: &synt::Highlighter,
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f: &mut F,
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) where
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F: FnMut(&LinkedNode, synt::Style),
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{
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if node.children().len() == 0 {
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let style = highlighter.style_for_stack(&scopes);
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f(node, style);
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return;
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}
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for child in node.children() {
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let mut scopes = scopes.clone();
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if let Some(tag) = typst::ide::highlight(&child) {
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scopes.push(syntect::parsing::Scope::new(tag.tm_scope()).unwrap())
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}
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highlight_themed(&child, scopes, highlighter, f);
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}
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}
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/// Style a piece of text with a syntect style.
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fn styled(piece: &str, foreground: Paint, style: synt::Style) -> Content {
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let mut body = TextNode::packed(piece);
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let paint = to_typst(style.foreground).into();
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if paint != foreground {
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body = body.styled(TextNode::FILL, paint);
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}
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if style.font_style.contains(synt::FontStyle::BOLD) {
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body = body.strong();
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}
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if style.font_style.contains(synt::FontStyle::ITALIC) {
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body = body.emph();
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}
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if style.font_style.contains(synt::FontStyle::UNDERLINE) {
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body = body.underlined();
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}
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body
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}
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fn to_typst(synt::Color { r, g, b, a }: synt::Color) -> RgbaColor {
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RgbaColor { r, g, b, a }
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}
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fn to_syn(RgbaColor { r, g, b, a }: RgbaColor) -> synt::Color {
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synt::Color { r, g, b, a }
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}
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/// The syntect syntax definitions.
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static SYNTAXES: Lazy<syntect::parsing::SyntaxSet> =
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Lazy::new(|| syntect::parsing::SyntaxSet::load_defaults_nonewlines());
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/// The default theme used for syntax highlighting.
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pub static THEME: Lazy<synt::Theme> = Lazy::new(|| synt::Theme {
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name: Some("Typst Light".into()),
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author: Some("The Typst Project Developers".into()),
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settings: synt::ThemeSettings::default(),
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scopes: vec![
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item("comment", Some("#8a8a8a"), None),
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item("constant.character.escape", Some("#1d6c76"), None),
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item("markup.bold", None, Some(synt::FontStyle::BOLD)),
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item("markup.italic", None, Some(synt::FontStyle::ITALIC)),
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item("markup.underline", None, Some(synt::FontStyle::UNDERLINE)),
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item("markup.raw", Some("#818181"), None),
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item("string.other.math.typst", None, None),
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item("punctuation.definition.math", Some("#298e0d"), None),
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item("keyword.operator.math", Some("#1d6c76"), None),
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item("markup.heading, entity.name.section", None, Some(synt::FontStyle::BOLD)),
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item(
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"markup.heading.typst",
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None,
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Some(synt::FontStyle::BOLD | synt::FontStyle::UNDERLINE),
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),
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item("punctuation.definition.list", Some("#8b41b1"), None),
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item("markup.list.term", None, Some(synt::FontStyle::BOLD)),
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item("entity.name.label, markup.other.reference", Some("#1d6c76"), None),
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item("keyword, constant.language, variable.language", Some("#d73a49"), None),
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item("storage.type, storage.modifier", Some("#d73a49"), None),
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item("constant", Some("#b60157"), None),
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item("string", Some("#298e0d"), None),
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item("entity.name, variable.function, support", Some("#4b69c6"), None),
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item("support.macro", Some("#16718d"), None),
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item("meta.annotation", Some("#301414"), None),
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item("entity.other, meta.interpolation", Some("#8b41b1"), None),
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item("invalid", Some("#ff0000"), None),
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],
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});
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/// Create a syntect theme item.
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fn item(
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scope: &str,
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color: Option<&str>,
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font_style: Option<synt::FontStyle>,
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) -> synt::ThemeItem {
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synt::ThemeItem {
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scope: scope.parse().unwrap(),
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style: synt::StyleModifier {
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foreground: color.map(|s| to_syn(s.parse::<RgbaColor>().unwrap())),
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background: None,
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font_style,
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},
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}
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}
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