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use typst::model::StyledNode;
use crate::layout::{LayoutRoot, PageNode};
use crate::prelude::*;
/// The root element of a document and its metadata.
///
/// All documents are automatically wrapped in a `document` element. The main
/// use of this element is to use it in `set` rules to specify document
/// metadata.
///
/// The metadata set with this function is not rendered within the document.
/// Instead, it is embedded in the compiled PDF file.
///
/// Display: Document
/// Category: meta
#[node(LayoutRoot)]
pub struct DocumentNode {
/// The document's title. This is often rendered as the title of the
/// PDF viewer window.
pub title: Option<EcoString>,
/// The document's authors.
pub author: Author,
/// The page runs.
#[internal]
#[variadic]
pub children: Vec<Content>,
}
impl LayoutRoot for DocumentNode {
/// Layout the document into a sequence of frames, one per page.
fn layout_root(&self, vt: &mut Vt, styles: StyleChain) -> SourceResult<Document> {
let mut pages = vec![];
for mut child in self.children() {
let map;
let outer = styles;
let mut styles = outer;
if let Some(node) = child.to::<StyledNode>() {
map = node.styles();
styles = outer.chain(&map);
child = node.body();
}
if let Some(page) = child.to::<PageNode>() {
let number = 1 + pages.len();
let fragment = page.layout(vt, number, styles)?;
pages.extend(fragment);
} else {
bail!(child.span(), "unexpected document child");
}
}
Ok(Document {
pages,
title: self.title(styles),
author: self.author(styles).0,
})
}
}
/// A list of authors.
#[derive(Debug, Default, Clone, Hash)]
pub struct Author(Vec<EcoString>);
cast_from_value! {
Author,
v: EcoString => Self(vec![v]),
v: Array => Self(v.into_iter().map(Value::cast).collect::<StrResult<_>>()?),
}
cast_to_value! {
v: Author => v.0.into()
}
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