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use comemo::{Track, Tracked, TrackedMut};
use typst_library::diag::{At, SourceResult};
use typst_library::engine::{Engine, Route, Sink, Traced};
use typst_library::foundations::{Content, StyleChain};
use typst_library::introspection::{Introspector, Locator, LocatorLink};
use typst_library::routines::{Arenas, FragmentKind, RealizationKind, Routines};
use typst_library::World;
use crate::HtmlNode;
/// Produce HTML nodes from content.
#[typst_macros::time(name = "html fragment")]
pub fn html_fragment(
engine: &mut Engine,
content: &Content,
locator: Locator,
styles: StyleChain,
) -> SourceResult<Vec<HtmlNode>> {
html_fragment_impl(
engine.routines,
engine.world,
engine.introspector,
engine.traced,
TrackedMut::reborrow_mut(&mut engine.sink),
engine.route.track(),
content,
locator.track(),
styles,
)
}
/// The cached, internal implementation of [`html_fragment`].
#[comemo::memoize]
#[allow(clippy::too_many_arguments)]
fn html_fragment_impl(
routines: &Routines,
world: Tracked<dyn World + '_>,
introspector: Tracked<Introspector>,
traced: Tracked<Traced>,
sink: TrackedMut<Sink>,
route: Tracked<Route>,
content: &Content,
locator: Tracked<Locator>,
styles: StyleChain,
) -> SourceResult<Vec<HtmlNode>> {
let link = LocatorLink::new(locator);
let mut locator = Locator::link(&link).split();
let mut engine = Engine {
routines,
world,
introspector,
traced,
sink,
route: Route::extend(route),
};
engine.route.check_html_depth().at(content.span())?;
let arenas = Arenas::default();
let children = (engine.routines.realize)(
// No need to know about the `FragmentKind` because we handle both
// uniformly.
RealizationKind::HtmlFragment {
kind: &mut FragmentKind::Block,
is_inline: crate::convert::is_inline,
},
&mut engine,
&mut locator,
&arenas,
content,
styles,
)?;
crate::convert::convert_to_nodes(&mut engine, &mut locator, children.iter().copied())
}
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