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use crate::layout::{LayoutRoot, PageElem};
use crate::prelude::*;
/// The root element of a document and its metadata.
///
/// All documents are automatically wrapped in a `document` element. You cannot
/// create a document element yourself. This function is only used with
/// [set rules]($styling/#set-rules) to specify document metadata. Such a set
/// rule must appear before any of the document's contents.
///
/// ```example
/// #set document(title: "Hello")
///
/// This has no visible output, but
/// embeds metadata into the PDF!
/// ```
///
/// Note that metadata set with this function is not rendered within the
/// document. Instead, it is embedded in the compiled PDF file.
///
/// Display: Document
/// Category: meta
#[element(Construct, LayoutRoot)]
pub struct DocumentElem {
/// 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 Construct for DocumentElem {
fn construct(_: &mut Vm, args: &mut Args) -> SourceResult<Content> {
bail!(args.span, "can only be used in set rules")
}
}
impl LayoutRoot for DocumentElem {
/// Layout the document into a sequence of frames, one per page.
#[tracing::instrument(name = "DocumentElem::layout_root", skip_all)]
fn layout_root(&self, vt: &mut Vt, styles: StyleChain) -> SourceResult<Document> {
tracing::info!("Document layout");
let mut pages = vec![];
for mut child in &self.children() {
let outer = styles;
let mut styles = styles;
if let Some((elem, local)) = child.to_styled() {
styles = outer.chain(local);
child = elem;
}
if let Some(page) = child.to::<PageElem>() {
let number = NonZeroUsize::ONE.saturating_add(pages.len());
let fragment = page.layout(vt, styles, number)?;
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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