Struct Context

pub(crate) struct Context<'tcx> {
    pub(crate) current: Vec<Symbol>,
    pub(crate) dst: PathBuf,
    pub(super) deref_id_map: RefCell<DefIdMap<String>>,
    pub(super) id_map: RefCell<IdMap>,
    pub(crate) shared: SharedContext<'tcx>,
    pub(crate) types_with_notable_traits: RefCell<FxIndexSet<Type>>,
    pub(crate) info: ContextInfo,
}

Major driving force in all rustdoc rendering. This contains information about where in the tree-like hierarchy rendering is occurring and controls how the current page is being rendered.

It is intended that this context is a lightweight object which can be fairly easily cloned because it is cloned per work-job (about once per item in the rustdoc tree).

Fields

current: Vec<Symbol>

Current hierarchy of components leading down to what’s currently being rendered

dst: PathBuf

The current destination folder of where HTML artifacts should be placed. This changes as the context descends into the module hierarchy.

deref_id_map: RefCell<DefIdMap<String>>

Tracks section IDs for Deref targets so they match in both the main body and the sidebar.

id_map: RefCell<IdMap>

The map used to ensure all generated ‘id=’ attributes are unique.

shared: SharedContext<'tcx>

Shared mutable state.

Issue for improving the situation: #82381

types_with_notable_traits: RefCell<FxIndexSet<Type>>

Collection of all types with notable traits referenced in the current module.

info: ContextInfo

Contains information that needs to be saved and reset after rendering an item which is not a module.

Implementations

impl<'tcx> Context<'tcx>

pub(crate) fn tcx(&self) -> TyCtxt<'tcx>

pub(crate) fn cache(&self) -> &Cache

pub(super) fn sess(&self) -> &'tcx Session

pub(super) fn derive_id<S: AsRef<str> + ToString>(&self, id: S) -> String

pub(super) fn root_path(&self) -> String

String representation of how to get back to the root path of the ‘doc/’ folder in terms of a relative URL.

fn render_item(&mut self, it: &Item, is_module: bool) -> String

fn build_sidebar_items(&self, m: &Module) -> BTreeMap<String, Vec<String>>

Construct a map of items shown in the sidebar to a plain-text summary of their docs.

pub(super) fn src_href(&self, item: &Item) -> Option<String>

Generates a url appropriate for an href attribute back to the source of this item.

The url generated, when clicked, will redirect the browser back to the original source code.

If None is returned, then a source link couldn’t be generated. This may happen, for example, with externally inlined items where the source of their crate documentation isn’t known.

pub(crate) fn href_from_span( &self, span: Span, with_lines: bool, ) -> Option<String>

pub(crate) fn href_from_span_relative( &self, span: Span, relative_to: &str, ) -> Option<String>

Trait Implementations

impl<'tcx> FormatRenderer<'tcx> for Context<'tcx>

Generates the documentation for crate into the directory dst

const RUN_ON_MODULE: bool = true

Whether to call item recursively for modules

type ModuleData = ContextInfo

This associated type is the type where the current module information is stored.

fn descr() -> &'static str

Gives a description of the renderer. Used for performance profiling.

fn init( krate: Crate, options: RenderOptions, cache: Cache, tcx: TyCtxt<'tcx>, ) -> Result<(Self, Crate), Error>

Sets up any state required for the renderer. When this is called the cache has already been populated.

fn save_module_data(&mut self) -> Self::ModuleData

This method is called right before call Self::item. This method returns a type containing information that needs to be reset after the Self::item method has been called with the Self::restore_module_data method.

fn restore_module_data(&mut self, info: Self::ModuleData)

Used to reset current module’s information.

fn after_krate(&mut self) -> Result<(), Error>

Post processing hook for cleanup and dumping output to files.

fn mod_item_in(&mut self, item: &Item) -> Result<(), Error>

Renders a module (should not handle recursing into children).

fn mod_item_out(&mut self) -> Result<(), Error>

Runs after recursively rendering all sub-items of a module.

fn item(&mut self, item: Item) -> Result<(), Error>

Renders a single non-module item. This means no recursive sub-item rendering is required.

fn cache(&self) -> &Cache

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 2352 bytes