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use rustc_middle::ty::TyCtxt;
use rustc_span::edition::Edition;
use crate::clean;
use crate::config::{RenderInfo, RenderOptions};
use crate::error::Error;
use crate::formats::cache::Cache;
/// Allows for different backends to rustdoc to be used with the `run_format()` function. Each
/// backend renderer has hooks for initialization, documenting an item, entering and exiting a
/// module, and cleanup/finalizing output.
crate trait FormatRenderer<'tcx>: Clone {
/// Gives a description of the renderer. Used for performance profiling.
fn descr() -> &'static str;
/// Sets up any state required for the renderer. When this is called the cache has already been
/// populated.
fn init(
krate: clean::Crate,
options: RenderOptions,
render_info: RenderInfo,
edition: Edition,
cache: Cache,
tcx: TyCtxt<'tcx>,
) -> Result<(Self, clean::Crate), Error>;
/// Renders a single non-module item. This means no recursive sub-item rendering is required.
fn item(&mut self, item: clean::Item) -> Result<(), Error>;
/// Renders a module (should not handle recursing into children).
fn mod_item_in(&mut self, item: &clean::Item, item_name: &str) -> Result<(), Error>;
/// Runs after recursively rendering all sub-items of a module.
fn mod_item_out(&mut self, item_name: &str) -> Result<(), Error>;
/// Post processing hook for cleanup and dumping output to files.
///
/// A handler is available if the renderer wants to report errors.
fn after_krate(
&mut self,
krate: &clean::Crate,
diag: &rustc_errors::Handler,
) -> Result<(), Error>;
fn cache(&self) -> &Cache;
}
/// Main method for rendering a crate.
crate fn run_format<'tcx, T: FormatRenderer<'tcx>>(
krate: clean::Crate,
options: RenderOptions,
render_info: RenderInfo,
diag: &rustc_errors::Handler,
edition: Edition,
tcx: TyCtxt<'tcx>,
) -> Result<(), Error> {
let (krate, cache) = tcx.sess.time("create_format_cache", || {
Cache::from_krate(
render_info.clone(),
options.document_private,
&options.extern_html_root_urls,
&options.output,
krate,
)
});
let prof = &tcx.sess.prof;
let (mut format_renderer, mut krate) = prof
.extra_verbose_generic_activity("create_renderer", T::descr())
.run(|| T::init(krate, options, render_info, edition, cache, tcx))?;
let mut item = match krate.module.take() {
Some(i) => i,
None => return Ok(()),
};
item.name = Some(krate.name);
// Render the crate documentation
let mut work = vec![(format_renderer.clone(), item)];
let unknown = rustc_span::Symbol::intern("<unknown item>");
while let Some((mut cx, item)) = work.pop() {
if item.is_mod() {
// modules are special because they add a namespace. We also need to
// recurse into the items of the module as well.
let name = item.name.as_ref().unwrap().to_string();
if name.is_empty() {
panic!("Unexpected module with empty name");
}
let _timer = prof.generic_activity_with_arg("render_mod_item", name.as_str());
cx.mod_item_in(&item, &name)?;
let module = match *item.kind {
clean::StrippedItem(box clean::ModuleItem(m)) | clean::ModuleItem(m) => m,
_ => unreachable!(),
};
for it in module.items {
debug!("Adding {:?} to worklist", it.name);
work.push((cx.clone(), it));
}
cx.mod_item_out(&name)?;
} else if item.name.is_some() {
prof.generic_activity_with_arg("render_item", &*item.name.unwrap_or(unknown).as_str())
.run(|| cx.item(item))?;
}
}
prof.extra_verbose_generic_activity("renderer_after_krate", T::descr())
.run(|| format_renderer.after_krate(&krate, diag))
}
|
