1 files changed, 127 insertions, 0 deletions
diff --git a/src/library/text/raw.rs b/src/library/text/raw.rs
new file mode 100644
index 00000000..97857f11
--- /dev/null
+++ b/src/library/text/raw.rs
@@ -0,0 +1,127 @@
+use once_cell::sync::Lazy;
+use syntect::easy::HighlightLines;
+use syntect::highlighting::{FontStyle, Highlighter, Style, Theme, ThemeSet};
+use syntect::parsing::SyntaxSet;
+
+use crate::library::prelude::*;
+use crate::library::text::TextNode;
+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,
+}
+
+#[class]
+impl RawNode {
+    /// The language to syntax-highlight in.
+    pub const LANG: Option<EcoString> = None;
+
+    fn construct(_: &mut Context, args: &mut Args) -> TypResult<Template> {
+        Ok(Template::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<Template> {
+        let lang = styles.get_ref(Self::LANG).as_ref();
+
+        if let Some(template) = styles.show(self, ctx, [
+            Value::Str(self.text.clone()),
+            match lang {
+                Some(lang) => Value::Str(lang.clone()),
+                None => Value::None,
+            },
+            Value::Bool(self.block),
+        ])? {
+            return Ok(template);
+        }
+
+        let foreground = THEME
+            .settings
+            .foreground
+            .map(Color::from)
+            .unwrap_or(Color::BLACK)
+            .into();
+
+        let mut template = 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));
+            });
+
+            Template::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(Template::Linebreak);
+                }
+
+                for (style, piece) in highlighter.highlight(line, &SYNTAXES) {
+                    seq.push(styled(piece, foreground, style));
+                }
+            }
+
+            Template::sequence(seq)
+        } else {
+            Template::Text(self.text.clone())
+        };
+
+        if self.block {
+            template = Template::Block(template.pack());
+        }
+
+        Ok(template.monospaced())
+    }
+}
+
+/// Style a piece of text with a syntect style.
+fn styled(piece: &str, foreground: Paint, style: Style) -> Template {
+    let mut styles = StyleMap::new();
+    let mut body = Template::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, true);
+    }
+
+    if style.font_style.contains(FontStyle::ITALIC) {
+        styles.set(TextNode::EMPH, true);
+    }
+
+    if style.font_style.contains(FontStyle::UNDERLINE) {
+        body = body.underlined();
+    }
+
+    body.styled_with_map(styles)
+}