Reduce dependencies from compiler on library

21 files changed, 312 insertions, 320 deletions

diff --git a/src/export/pdf/mod.rs b/src/export/pdf/mod.rs
index a87f5c6b..2f6f255d 100644
--- a/src/export/pdf/mod.rs
+++ b/src/export/pdf/mod.rs
@@ -15,10 +15,9 @@ use pdf_writer::{Finish, Name, PdfWriter, Ref, TextStr};
 use self::outline::{Heading, HeadingNode};
 use self::page::Page;
 use crate::font::Font;
-use crate::frame::Frame;
+use crate::frame::{Frame, Lang};
 use crate::geom::{Dir, Em, Length};
 use crate::image::Image;
-use crate::library::text::Lang;
 
 /// Export a collection of frames into a PDF file.
 ///
diff --git a/src/frame.rs b/src/frame.rs
index c7827a9c..a367935c 100644
--- a/src/frame.rs
+++ b/src/frame.rs
@@ -6,10 +6,9 @@ use std::sync::Arc;
 
 use crate::font::Font;
 use crate::geom::{
-    Align, Em, Length, Numeric, Paint, Point, Shape, Size, Spec, Transform,
+    Align, Dir, Em, Length, Numeric, Paint, Point, Shape, Size, Spec, Transform,
 };
 use crate::image::Image;
-use crate::library::text::Lang;
 use crate::model::{Dict, Value};
 use crate::util::EcoString;
 
@@ -397,6 +396,64 @@ pub struct Glyph {
     pub c: char,
 }
 
+/// A code for a natural language.
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
+pub struct Lang([u8; 3], u8);
+
+impl Lang {
+    /// The code for the english language.
+    pub const ENGLISH: Self = Self(*b"en ", 2);
+
+    /// Construct a language from a two- or three-byte ISO 639-1/2/3 code.
+    pub fn from_str(iso: &str) -> Option<Self> {
+        let len = iso.len();
+        if matches!(len, 2 ..= 3) && iso.is_ascii() {
+            let mut bytes = [b' '; 3];
+            bytes[.. len].copy_from_slice(iso.as_bytes());
+            bytes.make_ascii_lowercase();
+            Some(Self(bytes, len as u8))
+        } else {
+            None
+        }
+    }
+
+    /// Return the language code as an all lowercase string slice.
+    pub fn as_str(&self) -> &str {
+        std::str::from_utf8(&self.0[.. usize::from(self.1)]).unwrap_or_default()
+    }
+
+    /// The default direction for the language.
+    pub fn dir(self) -> Dir {
+        match self.as_str() {
+            "ar" | "dv" | "fa" | "he" | "ks" | "pa" | "ps" | "sd" | "ug" | "ur"
+            | "yi" => Dir::RTL,
+            _ => Dir::LTR,
+        }
+    }
+}
+
+/// A code for a region somewhere in the world.
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
+pub struct Region([u8; 2]);
+
+impl Region {
+    /// Construct a region from its two-byte ISO 3166-1 alpha-2 code.
+    pub fn from_str(iso: &str) -> Option<Self> {
+        if iso.is_ascii() {
+            let mut bytes: [u8; 2] = iso.as_bytes().try_into().ok()?;
+            bytes.make_ascii_uppercase();
+            Some(Self(bytes))
+        } else {
+            None
+        }
+    }
+
+    /// Return the region code as an all uppercase string slice.
+    pub fn as_str(&self) -> &str {
+        std::str::from_utf8(&self.0).unwrap_or_default()
+    }
+}
+
 /// A link destination.
 #[derive(Debug, Clone, Eq, PartialEq, Hash)]
 pub enum Destination {
diff --git a/src/lib.rs b/src/lib.rs
index 25f59aae..caed7592 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -46,6 +46,7 @@ pub mod image;
 pub mod library;
 pub mod syntax;
 
+use std::num::NonZeroUsize;
 use std::path::{Path, PathBuf};
 
 use comemo::{Prehashed, Track};
@@ -54,9 +55,9 @@ use crate::diag::{FileResult, SourceResult};
 use crate::font::{Font, FontBook};
 use crate::frame::Frame;
 use crate::model::StyleMap;
-use crate::model::{Route, Scope};
+use crate::model::{Content, Route, Scope};
 use crate::syntax::{Source, SourceId};
-use crate::util::Buffer;
+use crate::util::{Buffer, EcoString};
 
 /// Typeset a source file into a collection of layouted frames.
 ///
@@ -105,6 +106,10 @@ pub struct Config {
     ///
     /// Default: Typst's standard library.
     pub std: Scope,
+    /// Defines which standard library items fulfill which syntactical roles.
+    ///
+    /// Default: Typst's standard library's role map.
+    pub roles: RoleMap,
     /// The default properties for page size, font selection and so on.
     ///
     /// Default: Empty style map.
@@ -115,8 +120,23 @@ impl Default for Config {
     fn default() -> Self {
         Self {
             root: PathBuf::new(),
-            std: library::new(),
+            std: library::scope(),
             styles: StyleMap::new(),
+            roles: library::roles(),
         }
     }
 }
+
+/// Definition of certain standard library items the language is aware of.
+#[derive(Debug, Clone, Hash)]
+pub struct RoleMap {
+    strong: fn(Content) -> Content,
+    emph: fn(Content) -> Content,
+    raw: fn(EcoString, Option<EcoString>, bool) -> Content,
+    link: fn(EcoString) -> Content,
+    ref_: fn(EcoString) -> Content,
+    heading: fn(NonZeroUsize, Content) -> Content,
+    list_item: fn(Content) -> Content,
+    enum_item: fn(Option<usize>, Content) -> Content,
+    desc_item: fn(Content, Content) -> Content,
+}
diff --git a/src/library/graphics/mod.rs b/src/library/graphics/mod.rs
index e9a6188f..34182121 100644
--- a/src/library/graphics/mod.rs
+++ b/src/library/graphics/mod.rs
@@ -4,10 +4,8 @@ mod hide;
 mod image;
 mod line;
 mod shape;
-mod transform;
 
 pub use self::image::*;
 pub use hide::*;
 pub use line::*;
 pub use shape::*;
-pub use transform::*;
diff --git a/src/library/layout/mod.rs b/src/library/layout/mod.rs
index 588b15aa..02276f22 100644
--- a/src/library/layout/mod.rs
+++ b/src/library/layout/mod.rs
@@ -10,6 +10,7 @@ mod page;
 mod place;
 mod spacing;
 mod stack;
+mod transform;
 
 pub use align::*;
 pub use columns::*;
@@ -21,3 +22,4 @@ pub use page::*;
 pub use place::*;
 pub use spacing::*;
 pub use stack::*;
+pub use transform::*;
diff --git a/src/library/layout/page.rs b/src/library/layout/page.rs
index 9cbbcca5..7d13163d 100644
--- a/src/library/layout/page.rs
+++ b/src/library/layout/page.rs
@@ -188,7 +188,7 @@ impl Marginal {
             Self::Content(content) => Some(content.clone()),
             Self::Func(func, span) => {
                 let args = Args::new(*span, [Value::Int(page as i64)]);
-                Some(func.call_detached(world, args)?.display())
+                Some(func.call_detached(world, args)?.display(world))
             }
         })
     }
diff --git a/src/library/graphics/transform.rs b/src/library/layout/transform.rs
index b110f343..b110f343 100644
--- a/src/library/graphics/transform.rs
+++ b/src/library/layout/transform.rs
diff --git a/src/library/math/mod.rs b/src/library/math/mod.rs
index 7b5fdf52..7d0fecb4 100644
--- a/src/library/math/mod.rs
+++ b/src/library/math/mod.rs
@@ -15,7 +15,7 @@ use rex::render::{Backend, Cursor, Renderer};
 use crate::font::Font;
 use crate::library::layout::BlockSpacing;
 use crate::library::prelude::*;
-use crate::library::text::{variant, FontFamily, Lang, TextNode};
+use crate::library::text::{variant, FontFamily, TextNode};
 
 /// A piece of a mathematical formula.
 #[derive(Debug, Clone, Hash)]
diff --git a/src/library/mod.rs b/src/library/mod.rs
index b42ec071..cf9acdac 100644
--- a/src/library/mod.rs
+++ b/src/library/mod.rs
@@ -14,7 +14,7 @@ pub mod utility;
 use prelude::*;
 
 /// Construct a scope containing all standard library definitions.
-pub fn new() -> Scope {
+pub fn scope() -> Scope {
     let mut std = Scope::new();
 
     // Text.
@@ -58,6 +58,9 @@ pub fn new() -> Scope {
     std.def_node::<layout::ColumnsNode>("columns");
     std.def_node::<layout::ColbreakNode>("colbreak");
     std.def_node::<layout::PlaceNode>("place");
+    std.def_node::<layout::MoveNode>("move");
+    std.def_node::<layout::ScaleNode>("scale");
+    std.def_node::<layout::RotateNode>("rotate");
 
     // Graphics.
     std.def_node::<graphics::ImageNode>("image");
@@ -66,9 +69,6 @@ pub fn new() -> Scope {
     std.def_node::<graphics::SquareNode>("square");
     std.def_node::<graphics::EllipseNode>("ellipse");
     std.def_node::<graphics::CircleNode>("circle");
-    std.def_node::<graphics::MoveNode>("move");
-    std.def_node::<graphics::ScaleNode>("scale");
-    std.def_node::<graphics::RotateNode>("rotate");
     std.def_node::<graphics::HideNode>("hide");
 
     // Math.
@@ -142,3 +142,117 @@ pub fn new() -> Scope {
 
     std
 }
+
+/// Construct the standard role map.
+pub fn roles() -> RoleMap {
+    RoleMap {
+        strong: |body| Content::show(text::StrongNode(body)),
+        emph: |body| Content::show(text::EmphNode(body)),
+        raw: |text, lang, block| {
+            let node = Content::show(text::RawNode { text, block });
+            match lang {
+                Some(_) => node.styled(text::RawNode::LANG, lang),
+                None => node,
+            }
+        },
+        link: |url| Content::show(text::LinkNode::from_url(url)),
+        ref_: |target| Content::show(structure::RefNode(target)),
+        heading: |level, body| Content::show(structure::HeadingNode { level, body }),
+        list_item: |body| Content::Item(structure::ListItem::List(Box::new(body))),
+        enum_item: |number, body| {
+            Content::Item(structure::ListItem::Enum(number, Box::new(body)))
+        },
+        desc_item: |term, body| {
+            Content::Item(structure::ListItem::Desc(Box::new(structure::DescItem {
+                term,
+                body,
+            })))
+        },
+    }
+}
+
+/// Additional methods on content.
+pub trait ContentExt {
+    /// Make this content strong.
+    fn strong(self) -> Self;
+
+    /// Make this content emphasized.
+    fn emph(self) -> Self;
+
+    /// Underline this content.
+    fn underlined(self) -> Self;
+}
+
+impl ContentExt for Content {
+    fn strong(self) -> Self {
+        Self::show(text::StrongNode(self))
+    }
+
+    fn emph(self) -> Self {
+        Self::show(text::EmphNode(self))
+    }
+
+    fn underlined(self) -> Self {
+        Self::show(text::DecoNode::<{ text::UNDERLINE }>(self))
+    }
+}
+
+/// Additional methods for the style chain.
+pub trait StyleMapExt {
+    /// Set a font family composed of a preferred family and existing families
+    /// from a style chain.
+    fn set_family(&mut self, preferred: text::FontFamily, existing: StyleChain);
+}
+
+impl StyleMapExt for StyleMap {
+    fn set_family(&mut self, preferred: text::FontFamily, existing: StyleChain) {
+        self.set(
+            text::TextNode::FAMILY,
+            std::iter::once(preferred)
+                .chain(existing.get(text::TextNode::FAMILY).iter().cloned())
+                .collect(),
+        );
+    }
+}
+
+/// Additional methods for layout nodes.
+pub trait LayoutNodeExt {
+    /// Set alignments for this node.
+    fn aligned(self, aligns: Spec<Option<RawAlign>>) -> Self;
+
+    /// Pad this node at the sides.
+    fn padded(self, padding: Sides<Relative<RawLength>>) -> Self;
+
+    /// Transform this node's contents without affecting layout.
+    fn moved(self, delta: Spec<Relative<RawLength>>) -> Self;
+}
+
+impl LayoutNodeExt for LayoutNode {
+    fn aligned(self, aligns: Spec<Option<RawAlign>>) -> Self {
+        if aligns.any(Option::is_some) {
+            layout::AlignNode { aligns, child: self }.pack()
+        } else {
+            self
+        }
+    }
+
+    fn padded(self, padding: Sides<Relative<RawLength>>) -> Self {
+        if !padding.left.is_zero()
+            || !padding.top.is_zero()
+            || !padding.right.is_zero()
+            || !padding.bottom.is_zero()
+        {
+            layout::PadNode { padding, child: self }.pack()
+        } else {
+            self
+        }
+    }
+
+    fn moved(self, delta: Spec<Relative<RawLength>>) -> Self {
+        if delta.any(|r| !r.is_zero()) {
+            layout::MoveNode { delta, child: self }.pack()
+        } else {
+            self
+        }
+    }
+}
diff --git a/src/library/prelude.rs b/src/library/prelude.rs
index 7a4284f1..1d98e2a9 100644
--- a/src/library/prelude.rs
+++ b/src/library/prelude.rs
@@ -9,6 +9,7 @@ pub use std::sync::Arc;
 pub use comemo::Tracked;
 pub use typst_macros::node;
 
+pub use super::{ContentExt, LayoutNodeExt, StyleMapExt};
 pub use crate::diag::{
     with_alternative, At, FileError, FileResult, SourceError, SourceResult, StrResult,
 };
@@ -24,4 +25,4 @@ pub use crate::model::{
 };
 pub use crate::syntax::{Span, Spanned};
 pub use crate::util::EcoString;
-pub use crate::World;
+pub use crate::{RoleMap, World};
diff --git a/src/library/structure/list.rs b/src/library/structure/list.rs
index 7a43e5db..9d78238d 100644
--- a/src/library/structure/list.rs
+++ b/src/library/structure/list.rs
@@ -328,7 +328,7 @@ impl Label {
             Self::Content(content) => content.clone(),
             Self::Func(func, span) => {
                 let args = Args::new(*span, [Value::Int(number as i64)]);
-                func.call_detached(world, args)?.display()
+                func.call_detached(world, args)?.display(world)
             }
         })
     }
diff --git a/src/library/text/lang.rs b/src/library/text/lang.rs
deleted file mode 100644
index f2193f05..00000000
--- a/src/library/text/lang.rs
+++ /dev/null
@@ -1,74 +0,0 @@
-use crate::geom::Dir;
-use crate::model::Value;
-
-/// A code for a natural language.
-#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
-pub struct Lang([u8; 3], u8);
-
-impl Lang {
-    /// The code for the english language.
-    pub const ENGLISH: Self = Self(*b"en ", 2);
-
-    /// Construct a language from a two- or three-byte ISO 639-1/2/3 code.
-    pub fn from_str(iso: &str) -> Option<Self> {
-        let len = iso.len();
-        if matches!(len, 2 ..= 3) && iso.is_ascii() {
-            let mut bytes = [b' '; 3];
-            bytes[.. len].copy_from_slice(iso.as_bytes());
-            bytes.make_ascii_lowercase();
-            Some(Self(bytes, len as u8))
-        } else {
-            None
-        }
-    }
-
-    /// Return the language code as an all lowercase string slice.
-    pub fn as_str(&self) -> &str {
-        std::str::from_utf8(&self.0[.. usize::from(self.1)]).unwrap_or_default()
-    }
-
-    /// The default direction for the language.
-    pub fn dir(self) -> Dir {
-        match self.as_str() {
-            "ar" | "dv" | "fa" | "he" | "ks" | "pa" | "ps" | "sd" | "ug" | "ur"
-            | "yi" => Dir::RTL,
-            _ => Dir::LTR,
-        }
-    }
-}
-
-castable! {
-    Lang,
-    Expected: "string",
-    Value::Str(string) => Self::from_str(&string)
-        .ok_or("expected two or three letter language code (ISO 639-1/2/3)")?,
-}
-
-/// A code for a region somewhere in the world.
-#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
-pub struct Region([u8; 2]);
-
-impl Region {
-    /// Construct a region from its two-byte ISO 3166-1 alpha-2 code.
-    pub fn from_str(iso: &str) -> Option<Self> {
-        if iso.is_ascii() {
-            let mut bytes: [u8; 2] = iso.as_bytes().try_into().ok()?;
-            bytes.make_ascii_uppercase();
-            Some(Self(bytes))
-        } else {
-            None
-        }
-    }
-
-    /// Return the region code as an all uppercase string slice.
-    pub fn as_str(&self) -> &str {
-        std::str::from_utf8(&self.0).unwrap_or_default()
-    }
-}
-
-castable! {
-    Region,
-    Expected: "string",
-    Value::Str(string) => Self::from_str(&string)
-        .ok_or("expected two letter region code (ISO 3166-1 alpha-2)")?,
-}
diff --git a/src/library/text/mod.rs b/src/library/text/mod.rs
index c9bf2e57..299357de 100644
--- a/src/library/text/mod.rs
+++ b/src/library/text/mod.rs
@@ -1,7 +1,6 @@
 //! Text handling and paragraph layout.
 
 mod deco;
-mod lang;
 mod link;
 mod par;
 mod quotes;
@@ -11,7 +10,6 @@ mod shaping;
 mod shift;
 
 pub use deco::*;
-pub use lang::*;
 pub use link::*;
 pub use par::*;
 pub use quotes::*;
@@ -290,6 +288,20 @@ castable! {
     }),
 }
 
+castable! {
+    Lang,
+    Expected: "string",
+    Value::Str(string) => Self::from_str(&string)
+        .ok_or("expected two or three letter language code (ISO 639-1/2/3)")?,
+}
+
+castable! {
+    Region,
+    Expected: "string",
+    Value::Str(string) => Self::from_str(&string)
+        .ok_or("expected two letter region code (ISO 3166-1 alpha-2)")?,
+}
+
 /// The direction of text and inline objects in their line.
 #[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
 pub struct HorizontalDir(pub Dir);
diff --git a/src/model/collapse.rs b/src/model/collapse.rs
index 258f577e..5a0d6531 100644
--- a/src/model/collapse.rs
+++ b/src/model/collapse.rs
@@ -114,64 +114,3 @@ impl<'a, T> Default for CollapsingBuilder<'a, T> {
         Self::new()
     }
 }
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use crate::library::layout::FlowChild;
-    use crate::library::prelude::*;
-
-    #[track_caller]
-    fn test<T>(builder: CollapsingBuilder<T>, expected: &[T])
-    where
-        T: Debug + PartialEq,
-    {
-        let result = builder.finish().0;
-        let items: Vec<_> = result.items().collect();
-        let expected: Vec<_> = expected.iter().collect();
-        assert_eq!(items, expected);
-    }
-
-    fn node() -> FlowChild {
-        FlowChild::Node(Content::Text("Hi".into()).pack())
-    }
-
-    fn abs(pt: f64) -> FlowChild {
-        FlowChild::Spacing(Length::pt(pt).into())
-    }
-
-    #[test]
-    fn test_collapsing_weak() {
-        let mut builder = CollapsingBuilder::new();
-        let styles = StyleChain::default();
-        builder.weak(FlowChild::Colbreak, styles, 0);
-        builder.supportive(node(), styles);
-        builder.weak(abs(10.0), styles, 0);
-        builder.ignorant(FlowChild::Colbreak, styles);
-        builder.weak(abs(20.0), styles, 0);
-        builder.supportive(node(), styles);
-        builder.weak(abs(10.0), styles, 0);
-        builder.weak(abs(20.0), styles, 1);
-        builder.supportive(node(), styles);
-        test(builder, &[
-            node(),
-            FlowChild::Colbreak,
-            abs(20.0),
-            node(),
-            abs(10.0),
-            node(),
-        ]);
-    }
-
-    #[test]
-    fn test_collapsing_destructive() {
-        let mut builder = CollapsingBuilder::new();
-        let styles = StyleChain::default();
-        builder.supportive(node(), styles);
-        builder.weak(abs(10.0), styles, 0);
-        builder.destructive(FlowChild::Colbreak, styles);
-        builder.weak(abs(20.0), styles, 0);
-        builder.supportive(node(), styles);
-        test(builder, &[node(), FlowChild::Colbreak, node()]);
-    }
-}
diff --git a/src/model/content.rs b/src/model/content.rs
index 5f0536c3..428865f3 100644
--- a/src/model/content.rs
+++ b/src/model/content.rs
@@ -1,23 +1,24 @@
-use std::fmt::Debug;
+use std::fmt::{self, Debug, Formatter};
 use std::hash::Hash;
 use std::iter::Sum;
 use std::mem;
 use std::ops::{Add, AddAssign};
+use std::sync::Arc;
 
 use comemo::Tracked;
 use typed_arena::Arena;
 
 use super::{
-    Barrier, CollapsingBuilder, Interruption, Key, Layout, LayoutNode, Property, Show,
-    ShowNode, StyleEntry, StyleMap, StyleVecBuilder, Target,
+    Barrier, CollapsingBuilder, Dict, Interruption, Key, Layout, LayoutNode, Property,
+    Regions, Selector, Show, ShowNode, StyleChain, StyleEntry, StyleMap, StyleVecBuilder,
+    Target,
 };
-use crate::diag::StrResult;
+use crate::diag::{SourceResult, StrResult};
+use crate::frame::{Frame, Role};
+use crate::geom::{Length, Numeric};
 use crate::library::layout::{FlowChild, FlowNode, PageNode, PlaceNode, Spacing};
-use crate::library::prelude::*;
 use crate::library::structure::{DocNode, ListItem, ListNode, DESC, ENUM, LIST};
-use crate::library::text::{
-    DecoNode, EmphNode, ParChild, ParNode, StrongNode, UNDERLINE,
-};
+use crate::library::text::{ParChild, ParNode};
 use crate::util::EcoString;
 use crate::World;
 
@@ -173,21 +174,6 @@ impl Content {
         self.clone().styled_with_entry(StyleEntry::Unguard(sel))
     }
 
-    /// Make this content strong.
-    pub fn strong(self) -> Self {
-        Self::show(StrongNode(self))
-    }
-
-    /// Make this content emphasized.
-    pub fn emph(self) -> Self {
-        Self::show(EmphNode(self))
-    }
-
-    /// Underline this content.
-    pub fn underlined(self) -> Self {
-        Self::show(DecoNode::<UNDERLINE>(self))
-    }
-
     /// Add weak vertical spacing above and below the node.
     pub fn spaced(self, above: Option<Length>, below: Option<Length>) -> Self {
         if above.is_none() && below.is_none() {
diff --git a/src/model/eval.rs b/src/model/eval.rs
index aa5f0378..6658e244 100644
--- a/src/model/eval.rs
+++ b/src/model/eval.rs
@@ -141,7 +141,7 @@ fn eval_markup(
             ast::MarkupNode::Expr(ast::Expr::Wrap(wrap)) => {
                 let tail = eval_markup(vm, nodes)?;
                 vm.scopes.top.define(wrap.binding().take(), tail);
-                wrap.body().eval(vm)?.display()
+                wrap.body().eval(vm)?.display(vm.world)
             }
 
             _ => node.eval(vm)?,
@@ -181,7 +181,7 @@ impl Eval for ast::MarkupNode {
             Self::Desc(v) => v.eval(vm),
             Self::Label(v) => v.eval(vm),
             Self::Ref(v) => v.eval(vm),
-            Self::Expr(v) => v.eval(vm).map(Value::display),
+            Self::Expr(v) => v.eval(vm).map(|value| value.display(vm.world)),
         }
     }
 }
@@ -242,9 +242,7 @@ impl Eval for ast::Strong {
     type Output = Content;
 
     fn eval(&self, vm: &mut Vm) -> SourceResult<Self::Output> {
-        Ok(Content::show(library::text::StrongNode(
-            self.body().eval(vm)?,
-        )))
+        Ok((vm.roles().strong)(self.body().eval(vm)?))
     }
 }
 
@@ -252,34 +250,80 @@ impl Eval for ast::Emph {
     type Output = Content;
 
     fn eval(&self, vm: &mut Vm) -> SourceResult<Self::Output> {
-        Ok(Content::show(library::text::EmphNode(
-            self.body().eval(vm)?,
-        )))
+        Ok((vm.roles().emph)(self.body().eval(vm)?))
+    }
+}
+
+impl Eval for ast::Raw {
+    type Output = Content;
+
+    fn eval(&self, vm: &mut Vm) -> SourceResult<Self::Output> {
+        let text = self.text().clone();
+        let lang = self.lang().cloned();
+        let block = self.block();
+        Ok((vm.roles().raw)(text, lang, block))
     }
 }
 
 impl Eval for ast::Link {
     type Output = Content;
 
-    fn eval(&self, _: &mut Vm) -> SourceResult<Self::Output> {
-        Ok(Content::show(library::text::LinkNode::from_url(
-            self.url().clone(),
-        )))
+    fn eval(&self, vm: &mut Vm) -> SourceResult<Self::Output> {
+        Ok((vm.roles().link)(self.url().clone()))
     }
 }
 
-impl Eval for ast::Raw {
+impl Eval for ast::Label {
     type Output = Content;
 
     fn eval(&self, _: &mut Vm) -> SourceResult<Self::Output> {
-        let content = Content::show(library::text::RawNode {
-            text: self.text().clone(),
-            block: self.block(),
-        });
-        Ok(match self.lang() {
-            Some(_) => content.styled(library::text::RawNode::LANG, self.lang().cloned()),
-            None => content,
-        })
+        Ok(Content::Empty)
+    }
+}
+
+impl Eval for ast::Ref {
+    type Output = Content;
+
+    fn eval(&self, vm: &mut Vm) -> SourceResult<Self::Output> {
+        Ok((vm.roles().ref_)(self.get().clone()))
+    }
+}
+
+impl Eval for ast::Heading {
+    type Output = Content;
+
+    fn eval(&self, vm: &mut Vm) -> SourceResult<Self::Output> {
+        let level = self.level();
+        let body = self.body().eval(vm)?;
+        Ok((vm.roles().heading)(level, body))
+    }
+}
+
+impl Eval for ast::ListItem {
+    type Output = Content;
+
+    fn eval(&self, vm: &mut Vm) -> SourceResult<Self::Output> {
+        Ok((vm.roles().list_item)(self.body().eval(vm)?))
+    }
+}
+
+impl Eval for ast::EnumItem {
+    type Output = Content;
+
+    fn eval(&self, vm: &mut Vm) -> SourceResult<Self::Output> {
+        let number = self.number();
+        let body = self.body().eval(vm)?;
+        Ok((vm.roles().enum_item)(number, body))
+    }
+}
+
+impl Eval for ast::DescItem {
+    type Output = Content;
+
+    fn eval(&self, vm: &mut Vm) -> SourceResult<Self::Output> {
+        let term = self.term().eval(vm)?;
+        let body = self.body().eval(vm)?;
+        Ok((vm.roles().desc_item)(term, body))
     }
 }
 
@@ -318,7 +362,7 @@ impl Eval for ast::MathNode {
                 ),
                 node.span(),
             ),
-            Self::Expr(expr) => match expr.eval(vm)?.display() {
+            Self::Expr(expr) => match expr.eval(vm)?.display(vm.world) {
                 Content::Text(text) => library::math::MathNode::Atom(text),
                 _ => bail!(expr.span(), "expected text"),
             },
@@ -369,68 +413,6 @@ impl Eval for ast::Align {
     }
 }
 
-impl Eval for ast::Heading {
-    type Output = Content;
-
-    fn eval(&self, vm: &mut Vm) -> SourceResult<Self::Output> {
-        Ok(Content::show(library::structure::HeadingNode {
-            body: self.body().eval(vm)?,
-            level: self.level(),
-        }))
-    }
-}
-
-impl Eval for ast::ListItem {
-    type Output = Content;
-
-    fn eval(&self, vm: &mut Vm) -> SourceResult<Self::Output> {
-        let body = Box::new(self.body().eval(vm)?);
-        Ok(Content::Item(library::structure::ListItem::List(body)))
-    }
-}
-
-impl Eval for ast::EnumItem {
-    type Output = Content;
-
-    fn eval(&self, vm: &mut Vm) -> SourceResult<Self::Output> {
-        let number = self.number();
-        let body = Box::new(self.body().eval(vm)?);
-        Ok(Content::Item(library::structure::ListItem::Enum(
-            number, body,
-        )))
-    }
-}
-
-impl Eval for ast::DescItem {
-    type Output = Content;
-
-    fn eval(&self, vm: &mut Vm) -> SourceResult<Self::Output> {
-        let term = self.term().eval(vm)?;
-        let body = self.body().eval(vm)?;
-        Ok(Content::Item(library::structure::ListItem::Desc(Box::new(
-            library::structure::DescItem { term, body },
-        ))))
-    }
-}
-
-impl Eval for ast::Label {
-    type Output = Content;
-
-    fn eval(&self, _: &mut Vm) -> SourceResult<Self::Output> {
-        Ok(Content::Empty)
-    }
-}
-
-impl Eval for ast::Ref {
-    type Output = Content;
-
-    fn eval(&self, _: &mut Vm) -> SourceResult<Self::Output> {
-        Ok(Content::show(library::structure::RefNode(
-            self.get().clone(),
-        )))
-    }
-}
-
 impl Eval for ast::Expr {
     type Output = Value;
 
@@ -530,7 +512,7 @@ fn eval_code(
                     break;
                 }
 
-                let tail = eval_code(vm, exprs)?.display();
+                let tail = eval_code(vm, exprs)?.display(vm.world);
                 Value::Content(tail.styled_with_map(styles))
             }
             ast::Expr::Show(show) => {
@@ -540,7 +522,7 @@ fn eval_code(
                     break;
                 }
 
-                let tail = eval_code(vm, exprs)?.display();
+                let tail = eval_code(vm, exprs)?.display(vm.world);
                 Value::Content(tail.styled_with_entry(entry))
             }
             ast::Expr::Wrap(wrap) => {
diff --git a/src/model/layout.rs b/src/model/layout.rs
index 09888ba5..5248157b 100644
--- a/src/model/layout.rs
+++ b/src/model/layout.rs
@@ -8,19 +8,13 @@ use std::sync::Arc;
 use comemo::{Prehashed, Tracked};
 
 use super::{Barrier, NodeId, Resolve, StyleChain, StyleEntry};
-use super::{Builder, Content, RawAlign, RawLength, Scratch};
+use super::{Builder, Content, RawLength, Scratch};
 use crate::diag::SourceResult;
 use crate::frame::{Element, Frame};
-use crate::geom::{
-    Align, Geometry, Length, Paint, Point, Relative, Sides, Size, Spec, Stroke,
-};
-use crate::library::graphics::MoveNode;
-use crate::library::layout::{AlignNode, PadNode};
+use crate::geom::{Align, Geometry, Length, Paint, Point, Relative, Size, Spec, Stroke};
 use crate::World;
 
 /// Layout content into a collection of pages.
-///
-/// Relayouts until all pinned locations are converged.
 #[comemo::memoize]
 pub fn layout(world: Tracked<dyn World>, content: &Content) -> SourceResult<Vec<Frame>> {
     let styles = StyleChain::with_root(&world.config().styles);
@@ -196,37 +190,6 @@ impl LayoutNode {
     pub fn stroked(self, stroke: Stroke) -> Self {
         StrokeNode { stroke, child: self }.pack()
     }
-
-    /// Set alignments for this node.
-    pub fn aligned(self, aligns: Spec<Option<RawAlign>>) -> Self {
-        if aligns.any(Option::is_some) {
-            AlignNode { aligns, child: self }.pack()
-        } else {
-            self
-        }
-    }
-
-    /// Pad this node at the sides.
-    pub fn padded(self, padding: Sides<Relative<RawLength>>) -> Self {
-        if !padding.left.is_zero()
-            || !padding.top.is_zero()
-            || !padding.right.is_zero()
-            || !padding.bottom.is_zero()
-        {
-            PadNode { padding, child: self }.pack()
-        } else {
-            self
-        }
-    }
-
-    /// Transform this node's contents without affecting layout.
-    pub fn moved(self, delta: Spec<Relative<RawLength>>) -> Self {
-        if delta.any(|r| !r.is_zero()) {
-            MoveNode { delta, child: self }.pack()
-        } else {
-            self
-        }
-    }
 }
 
 impl Layout for LayoutNode {
diff --git a/src/model/recipe.rs b/src/model/recipe.rs
index 05ef07a6..46dad6d1 100644
--- a/src/model/recipe.rs
+++ b/src/model/recipe.rs
@@ -89,7 +89,7 @@ impl Recipe {
             Args::new(self.func.span, [arg()])
         };
 
-        Ok(self.func.v.call_detached(world, args)?.display())
+        Ok(self.func.v.call_detached(world, args)?.display(world))
     }
 
     /// What kind of structure the property interrupts.
diff --git a/src/model/styles.rs b/src/model/styles.rs
index 76199ca1..d21f3a9f 100644
--- a/src/model/styles.rs
+++ b/src/model/styles.rs
@@ -8,7 +8,6 @@ use comemo::Tracked;
 use super::{Barrier, Content, Key, Property, Recipe, Selector, Show, Target};
 use crate::diag::SourceResult;
 use crate::frame::Role;
-use crate::library::text::{FontFamily, TextNode};
 use crate::util::ReadableTypeId;
 use crate::World;
 
@@ -55,17 +54,6 @@ impl StyleMap {
         }
     }
 
-    /// Set a font family composed of a preferred family and existing families
-    /// from a style chain.
-    pub fn set_family(&mut self, preferred: FontFamily, existing: StyleChain) {
-        self.set(
-            TextNode::FAMILY,
-            iter::once(preferred)
-                .chain(existing.get(TextNode::FAMILY).iter().cloned())
-                .collect(),
-        );
-    }
-
     /// Whether the map contains a style property for the given key.
     pub fn contains<'a, K: Key<'a>>(&self, _: K) -> bool {
         self.0
diff --git a/src/model/value.rs b/src/model/value.rs
index 4075ce9c..e0d5edf3 100644
--- a/src/model/value.rs
+++ b/src/model/value.rs
@@ -4,13 +4,14 @@ use std::fmt::{self, Debug, Formatter};
 use std::hash::{Hash, Hasher};
 use std::sync::Arc;
 
+use comemo::Tracked;
 use siphasher::sip128::{Hasher128, SipHasher};
 
 use super::{ops, Args, Array, Cast, Content, Dict, Func, Layout, RawLength, Str};
 use crate::diag::StrResult;
 use crate::geom::{Angle, Color, Em, Fraction, Length, Ratio, Relative, RgbaColor};
-use crate::library::text::RawNode;
 use crate::util::EcoString;
+use crate::World;
 
 /// A computational value.
 #[derive(Clone)]
@@ -113,7 +114,7 @@ impl Value {
     }
 
     /// Return the display representation of the value.
-    pub fn display(self) -> Content {
+    pub fn display(self, world: Tracked<dyn World>) -> Content {
         match self {
             Value::None => Content::new(),
             Value::Int(v) => Content::Text(format_eco!("{}", v)),
@@ -123,8 +124,7 @@ impl Value {
 
             // For values which can't be shown "naturally", we return the raw
             // representation with typst code syntax highlighting.
-            v => Content::show(RawNode { text: v.repr().into(), block: false })
-                .styled(RawNode::LANG, Some("typc".into())),
+            v => (world.config().roles.raw)(v.repr().into(), Some("typc".into()), false),
         }
     }
 }
diff --git a/src/model/vm.rs b/src/model/vm.rs
index a1b1ba81..829693bc 100644
--- a/src/model/vm.rs
+++ b/src/model/vm.rs
@@ -6,7 +6,7 @@ use super::{Route, Scopes, Value};
 use crate::diag::{SourceError, StrResult};
 use crate::syntax::{SourceId, Span};
 use crate::util::PathExt;
-use crate::World;
+use crate::{RoleMap, World};
 
 /// A virtual machine.
 pub struct Vm<'a> {
@@ -54,6 +54,11 @@ impl<'a> Vm<'a> {
 
         return Err("cannot access file system from here".into());
     }
+
+    /// The role map.
+    pub fn roles(&self) -> &RoleMap {
+        &self.world.config().roles
+    }
 }
 
 /// A control flow event that occurred during evaluation.