| //! HTML formatting module |
| //! |
| //! This module contains a large number of `fmt::Display` implementations for |
| //! various types in `rustdoc::clean`. |
| //! |
| //! These implementations all emit HTML. As an internal implementation detail, |
| //! some of them support an alternate format that emits text, but that should |
| //! not be used external to this module. |
| |
| use std::borrow::Cow; |
| use std::cell::Cell; |
| use std::fmt::{self, Write}; |
| use std::iter::{self, once}; |
| |
| use rustc_ast as ast; |
| use rustc_attr::{ConstStability, StabilityLevel}; |
| use rustc_data_structures::captures::Captures; |
| use rustc_data_structures::fx::FxHashSet; |
| use rustc_hir as hir; |
| use rustc_hir::def::DefKind; |
| use rustc_hir::def_id::{DefId, LOCAL_CRATE}; |
| use rustc_metadata::creader::{CStore, LoadedMacro}; |
| use rustc_middle::ty; |
| use rustc_middle::ty::TyCtxt; |
| use rustc_span::symbol::kw; |
| use rustc_span::{sym, Symbol}; |
| use rustc_target::spec::abi::Abi; |
| |
| use itertools::Itertools; |
| |
| use crate::clean::{ |
| self, types::ExternalLocation, utils::find_nearest_parent_module, ExternalCrate, ItemId, |
| PrimitiveType, |
| }; |
| use crate::formats::item_type::ItemType; |
| use crate::html::escape::Escape; |
| use crate::html::render::Context; |
| use crate::passes::collect_intra_doc_links::UrlFragment; |
| |
| use super::url_parts_builder::estimate_item_path_byte_length; |
| use super::url_parts_builder::UrlPartsBuilder; |
| |
| pub(crate) trait Print { |
| fn print(self, buffer: &mut Buffer); |
| } |
| |
| impl<F> Print for F |
| where |
| F: FnOnce(&mut Buffer), |
| { |
| fn print(self, buffer: &mut Buffer) { |
| (self)(buffer) |
| } |
| } |
| |
| impl Print for String { |
| fn print(self, buffer: &mut Buffer) { |
| buffer.write_str(&self); |
| } |
| } |
| |
| impl Print for &'_ str { |
| fn print(self, buffer: &mut Buffer) { |
| buffer.write_str(self); |
| } |
| } |
| |
| #[derive(Debug, Clone)] |
| pub(crate) struct Buffer { |
| for_html: bool, |
| buffer: String, |
| } |
| |
| impl core::fmt::Write for Buffer { |
| #[inline] |
| fn write_str(&mut self, s: &str) -> fmt::Result { |
| self.buffer.write_str(s) |
| } |
| |
| #[inline] |
| fn write_char(&mut self, c: char) -> fmt::Result { |
| self.buffer.write_char(c) |
| } |
| |
| #[inline] |
| fn write_fmt(&mut self, args: fmt::Arguments<'_>) -> fmt::Result { |
| self.buffer.write_fmt(args) |
| } |
| } |
| |
| impl Buffer { |
| pub(crate) fn empty_from(v: &Buffer) -> Buffer { |
| Buffer { for_html: v.for_html, buffer: String::new() } |
| } |
| |
| pub(crate) fn html() -> Buffer { |
| Buffer { for_html: true, buffer: String::new() } |
| } |
| |
| pub(crate) fn new() -> Buffer { |
| Buffer { for_html: false, buffer: String::new() } |
| } |
| |
| pub(crate) fn is_empty(&self) -> bool { |
| self.buffer.is_empty() |
| } |
| |
| pub(crate) fn into_inner(self) -> String { |
| self.buffer |
| } |
| |
| pub(crate) fn push(&mut self, c: char) { |
| self.buffer.push(c); |
| } |
| |
| pub(crate) fn push_str(&mut self, s: &str) { |
| self.buffer.push_str(s); |
| } |
| |
| pub(crate) fn push_buffer(&mut self, other: Buffer) { |
| self.buffer.push_str(&other.buffer); |
| } |
| |
| // Intended for consumption by write! and writeln! (std::fmt) but without |
| // the fmt::Result return type imposed by fmt::Write (and avoiding the trait |
| // import). |
| pub(crate) fn write_str(&mut self, s: &str) { |
| self.buffer.push_str(s); |
| } |
| |
| // Intended for consumption by write! and writeln! (std::fmt) but without |
| // the fmt::Result return type imposed by fmt::Write (and avoiding the trait |
| // import). |
| pub(crate) fn write_fmt(&mut self, v: fmt::Arguments<'_>) { |
| self.buffer.write_fmt(v).unwrap(); |
| } |
| |
| pub(crate) fn to_display<T: Print>(mut self, t: T) -> String { |
| t.print(&mut self); |
| self.into_inner() |
| } |
| |
| pub(crate) fn reserve(&mut self, additional: usize) { |
| self.buffer.reserve(additional) |
| } |
| |
| pub(crate) fn len(&self) -> usize { |
| self.buffer.len() |
| } |
| } |
| |
| pub(crate) fn comma_sep<T: fmt::Display>( |
| items: impl Iterator<Item = T>, |
| space_after_comma: bool, |
| ) -> impl fmt::Display { |
| display_fn(move |f| { |
| for (i, item) in items.enumerate() { |
| if i != 0 { |
| write!(f, ",{}", if space_after_comma { " " } else { "" })?; |
| } |
| fmt::Display::fmt(&item, f)?; |
| } |
| Ok(()) |
| }) |
| } |
| |
| pub(crate) fn print_generic_bounds<'a, 'tcx: 'a>( |
| bounds: &'a [clean::GenericBound], |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| display_fn(move |f| { |
| let mut bounds_dup = FxHashSet::default(); |
| |
| for (i, bound) in bounds.iter().filter(|b| bounds_dup.insert(*b)).enumerate() { |
| if i > 0 { |
| f.write_str(" + ")?; |
| } |
| fmt::Display::fmt(&bound.print(cx), f)?; |
| } |
| Ok(()) |
| }) |
| } |
| |
| impl clean::GenericParamDef { |
| pub(crate) fn print<'a, 'tcx: 'a>( |
| &'a self, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| display_fn(move |f| match &self.kind { |
| clean::GenericParamDefKind::Lifetime { outlives } => { |
| write!(f, "{}", self.name)?; |
| |
| if !outlives.is_empty() { |
| f.write_str(": ")?; |
| for (i, lt) in outlives.iter().enumerate() { |
| if i != 0 { |
| f.write_str(" + ")?; |
| } |
| write!(f, "{}", lt.print())?; |
| } |
| } |
| |
| Ok(()) |
| } |
| clean::GenericParamDefKind::Type { bounds, default, .. } => { |
| f.write_str(self.name.as_str())?; |
| |
| if !bounds.is_empty() { |
| if f.alternate() { |
| write!(f, ": {:#}", print_generic_bounds(bounds, cx))?; |
| } else { |
| write!(f, ": {}", print_generic_bounds(bounds, cx))?; |
| } |
| } |
| |
| if let Some(ref ty) = default { |
| if f.alternate() { |
| write!(f, " = {:#}", ty.print(cx))?; |
| } else { |
| write!(f, " = {}", ty.print(cx))?; |
| } |
| } |
| |
| Ok(()) |
| } |
| clean::GenericParamDefKind::Const { ty, default, .. } => { |
| if f.alternate() { |
| write!(f, "const {}: {:#}", self.name, ty.print(cx))?; |
| } else { |
| write!(f, "const {}: {}", self.name, ty.print(cx))?; |
| } |
| |
| if let Some(default) = default { |
| if f.alternate() { |
| write!(f, " = {default:#}")?; |
| } else { |
| write!(f, " = {default}")?; |
| } |
| } |
| |
| Ok(()) |
| } |
| }) |
| } |
| } |
| |
| impl clean::Generics { |
| pub(crate) fn print<'a, 'tcx: 'a>( |
| &'a self, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| display_fn(move |f| { |
| let mut real_params = self.params.iter().filter(|p| !p.is_synthetic_param()).peekable(); |
| if real_params.peek().is_none() { |
| return Ok(()); |
| } |
| |
| if f.alternate() { |
| write!(f, "<{:#}>", comma_sep(real_params.map(|g| g.print(cx)), true)) |
| } else { |
| write!(f, "<{}>", comma_sep(real_params.map(|g| g.print(cx)), true)) |
| } |
| }) |
| } |
| } |
| |
| #[derive(Clone, Copy, PartialEq, Eq)] |
| pub(crate) enum Ending { |
| Newline, |
| NoNewline, |
| } |
| |
| /// * The Generics from which to emit a where-clause. |
| /// * The number of spaces to indent each line with. |
| /// * Whether the where-clause needs to add a comma and newline after the last bound. |
| pub(crate) fn print_where_clause<'a, 'tcx: 'a>( |
| gens: &'a clean::Generics, |
| cx: &'a Context<'tcx>, |
| indent: usize, |
| ending: Ending, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| display_fn(move |f| { |
| let mut where_predicates = gens.where_predicates.iter().filter(|pred| { |
| !matches!(pred, clean::WherePredicate::BoundPredicate { bounds, .. } if bounds.is_empty()) |
| }).map(|pred| { |
| display_fn(move |f| { |
| if f.alternate() { |
| f.write_str(" ")?; |
| } else { |
| f.write_str("\n")?; |
| } |
| |
| match pred { |
| clean::WherePredicate::BoundPredicate { ty, bounds, bound_params } => { |
| let ty_cx = ty.print(cx); |
| let generic_bounds = print_generic_bounds(bounds, cx); |
| |
| if bound_params.is_empty() { |
| if f.alternate() { |
| write!(f, "{ty_cx:#}: {generic_bounds:#}") |
| } else { |
| write!(f, "{ty_cx}: {generic_bounds}") |
| } |
| } else { |
| if f.alternate() { |
| write!( |
| f, |
| "for<{:#}> {ty_cx:#}: {generic_bounds:#}", |
| comma_sep(bound_params.iter().map(|lt| lt.print(cx)), true) |
| ) |
| } else { |
| write!( |
| f, |
| "for<{}> {ty_cx}: {generic_bounds}", |
| comma_sep(bound_params.iter().map(|lt| lt.print(cx)), true) |
| ) |
| } |
| } |
| } |
| clean::WherePredicate::RegionPredicate { lifetime, bounds } => { |
| let mut bounds_display = String::new(); |
| for bound in bounds.iter().map(|b| b.print(cx)) { |
| write!(bounds_display, "{bound} + ")?; |
| } |
| bounds_display.truncate(bounds_display.len() - " + ".len()); |
| write!(f, "{}: {bounds_display}", lifetime.print()) |
| } |
| // FIXME(fmease): Render bound params. |
| clean::WherePredicate::EqPredicate { lhs, rhs, bound_params: _ } => { |
| if f.alternate() { |
| write!(f, "{:#} == {:#}", lhs.print(cx), rhs.print(cx)) |
| } else { |
| write!(f, "{} == {}", lhs.print(cx), rhs.print(cx)) |
| } |
| } |
| } |
| }) |
| }).peekable(); |
| |
| if where_predicates.peek().is_none() { |
| return Ok(()); |
| } |
| |
| let where_preds = comma_sep(where_predicates, false); |
| let clause = if f.alternate() { |
| if ending == Ending::Newline { |
| format!(" where{where_preds},") |
| } else { |
| format!(" where{where_preds}") |
| } |
| } else { |
| let mut br_with_padding = String::with_capacity(6 * indent + 28); |
| br_with_padding.push('\n'); |
| |
| let where_indent = 3; |
| let padding_amount = if ending == Ending::Newline { |
| indent + 4 |
| } else if indent == 0 { |
| 4 |
| } else { |
| indent + where_indent + "where ".len() |
| }; |
| |
| for _ in 0..padding_amount { |
| br_with_padding.push(' '); |
| } |
| let where_preds = where_preds.to_string().replace('\n', &br_with_padding); |
| |
| if ending == Ending::Newline { |
| let mut clause = " ".repeat(indent.saturating_sub(1)); |
| write!(clause, "<span class=\"where fmt-newline\">where{where_preds},</span>")?; |
| clause |
| } else { |
| // insert a newline after a single space but before multiple spaces at the start |
| if indent == 0 { |
| format!("\n<span class=\"where\">where{where_preds}</span>") |
| } else { |
| // put the first one on the same line as the 'where' keyword |
| let where_preds = where_preds.replacen(&br_with_padding, " ", 1); |
| |
| let mut clause = br_with_padding; |
| // +1 is for `\n`. |
| clause.truncate(indent + 1 + where_indent); |
| |
| write!(clause, "<span class=\"where\">where{where_preds}</span>")?; |
| clause |
| } |
| } |
| }; |
| write!(f, "{clause}") |
| }) |
| } |
| |
| impl clean::Lifetime { |
| pub(crate) fn print(&self) -> impl fmt::Display + '_ { |
| self.0.as_str() |
| } |
| } |
| |
| impl clean::Constant { |
| pub(crate) fn print(&self, tcx: TyCtxt<'_>) -> impl fmt::Display + '_ { |
| let expr = self.expr(tcx); |
| display_fn( |
| move |f| { |
| if f.alternate() { f.write_str(&expr) } else { write!(f, "{}", Escape(&expr)) } |
| }, |
| ) |
| } |
| } |
| |
| impl clean::PolyTrait { |
| fn print<'a, 'tcx: 'a>( |
| &'a self, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| display_fn(move |f| { |
| if !self.generic_params.is_empty() { |
| if f.alternate() { |
| write!( |
| f, |
| "for<{:#}> ", |
| comma_sep(self.generic_params.iter().map(|g| g.print(cx)), true) |
| )?; |
| } else { |
| write!( |
| f, |
| "for<{}> ", |
| comma_sep(self.generic_params.iter().map(|g| g.print(cx)), true) |
| )?; |
| } |
| } |
| if f.alternate() { |
| write!(f, "{:#}", self.trait_.print(cx)) |
| } else { |
| write!(f, "{}", self.trait_.print(cx)) |
| } |
| }) |
| } |
| } |
| |
| impl clean::GenericBound { |
| pub(crate) fn print<'a, 'tcx: 'a>( |
| &'a self, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| display_fn(move |f| match self { |
| clean::GenericBound::Outlives(lt) => write!(f, "{}", lt.print()), |
| clean::GenericBound::TraitBound(ty, modifier) => { |
| let modifier_str = match modifier { |
| hir::TraitBoundModifier::None => "", |
| hir::TraitBoundModifier::Maybe => "?", |
| hir::TraitBoundModifier::Negative => "!", |
| // ~const is experimental; do not display those bounds in rustdoc |
| hir::TraitBoundModifier::MaybeConst => "", |
| }; |
| if f.alternate() { |
| write!(f, "{modifier_str}{ty:#}", ty = ty.print(cx)) |
| } else { |
| write!(f, "{modifier_str}{ty}", ty = ty.print(cx)) |
| } |
| } |
| }) |
| } |
| } |
| |
| impl clean::GenericArgs { |
| fn print<'a, 'tcx: 'a>( |
| &'a self, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| display_fn(move |f| { |
| match self { |
| clean::GenericArgs::AngleBracketed { args, bindings } => { |
| if !args.is_empty() || !bindings.is_empty() { |
| if f.alternate() { |
| f.write_str("<")?; |
| } else { |
| f.write_str("<")?; |
| } |
| let mut comma = false; |
| for arg in args.iter() { |
| if comma { |
| f.write_str(", ")?; |
| } |
| comma = true; |
| if f.alternate() { |
| write!(f, "{:#}", arg.print(cx))?; |
| } else { |
| write!(f, "{}", arg.print(cx))?; |
| } |
| } |
| for binding in bindings.iter() { |
| if comma { |
| f.write_str(", ")?; |
| } |
| comma = true; |
| if f.alternate() { |
| write!(f, "{:#}", binding.print(cx))?; |
| } else { |
| write!(f, "{}", binding.print(cx))?; |
| } |
| } |
| if f.alternate() { |
| f.write_str(">")?; |
| } else { |
| f.write_str(">")?; |
| } |
| } |
| } |
| clean::GenericArgs::Parenthesized { inputs, output } => { |
| f.write_str("(")?; |
| let mut comma = false; |
| for ty in inputs.iter() { |
| if comma { |
| f.write_str(", ")?; |
| } |
| comma = true; |
| if f.alternate() { |
| write!(f, "{:#}", ty.print(cx))?; |
| } else { |
| write!(f, "{}", ty.print(cx))?; |
| } |
| } |
| f.write_str(")")?; |
| if let Some(ref ty) = *output { |
| if f.alternate() { |
| write!(f, " -> {:#}", ty.print(cx))?; |
| } else { |
| write!(f, " -> {}", ty.print(cx))?; |
| } |
| } |
| } |
| } |
| Ok(()) |
| }) |
| } |
| } |
| |
| // Possible errors when computing href link source for a `DefId` |
| #[derive(PartialEq, Eq)] |
| pub(crate) enum HrefError { |
| /// This item is known to rustdoc, but from a crate that does not have documentation generated. |
| /// |
| /// This can only happen for non-local items. |
| /// |
| /// # Example |
| /// |
| /// Crate `a` defines a public trait and crate `b` – the target crate that depends on `a` – |
| /// implements it for a local type. |
| /// We document `b` but **not** `a` (we only _build_ the latter – with `rustc`): |
| /// |
| /// ```sh |
| /// rustc a.rs --crate-type=lib |
| /// rustdoc b.rs --crate-type=lib --extern=a=liba.rlib |
| /// ``` |
| /// |
| /// Now, the associated items in the trait impl want to link to the corresponding item in the |
| /// trait declaration (see `html::render::assoc_href_attr`) but it's not available since their |
| /// *documentation (was) not built*. |
| DocumentationNotBuilt, |
| /// This can only happen for non-local items when `--document-private-items` is not passed. |
| Private, |
| // Not in external cache, href link should be in same page |
| NotInExternalCache, |
| } |
| |
| // Panics if `syms` is empty. |
| pub(crate) fn join_with_double_colon(syms: &[Symbol]) -> String { |
| let mut s = String::with_capacity(estimate_item_path_byte_length(syms.len())); |
| s.push_str(syms[0].as_str()); |
| for sym in &syms[1..] { |
| s.push_str("::"); |
| s.push_str(sym.as_str()); |
| } |
| s |
| } |
| |
| /// This function is to get the external macro path because they are not in the cache used in |
| /// `href_with_root_path`. |
| fn generate_macro_def_id_path( |
| def_id: DefId, |
| cx: &Context<'_>, |
| root_path: Option<&str>, |
| ) -> Result<(String, ItemType, Vec<Symbol>), HrefError> { |
| let tcx = cx.shared.tcx; |
| let crate_name = tcx.crate_name(def_id.krate); |
| let cache = cx.cache(); |
| |
| let fqp: Vec<Symbol> = tcx |
| .def_path(def_id) |
| .data |
| .into_iter() |
| .filter_map(|elem| { |
| // extern blocks (and a few others things) have an empty name. |
| match elem.data.get_opt_name() { |
| Some(s) if !s.is_empty() => Some(s), |
| _ => None, |
| } |
| }) |
| .collect(); |
| let mut relative = fqp.iter().copied(); |
| let cstore = CStore::from_tcx(tcx); |
| // We need this to prevent a `panic` when this function is used from intra doc links... |
| if !cstore.has_crate_data(def_id.krate) { |
| debug!("No data for crate {crate_name}"); |
| return Err(HrefError::NotInExternalCache); |
| } |
| // Check to see if it is a macro 2.0 or built-in macro. |
| // More information in <https://rust-lang.github.io/rfcs/1584-macros.html>. |
| let is_macro_2 = match cstore.load_macro_untracked(def_id, tcx) { |
| LoadedMacro::MacroDef(def, _) => { |
| // If `ast_def.macro_rules` is `true`, then it's not a macro 2.0. |
| matches!(&def.kind, ast::ItemKind::MacroDef(ast_def) if !ast_def.macro_rules) |
| } |
| _ => false, |
| }; |
| |
| let mut path = if is_macro_2 { |
| once(crate_name).chain(relative).collect() |
| } else { |
| vec![crate_name, relative.next_back().unwrap()] |
| }; |
| if path.len() < 2 { |
| // The minimum we can have is the crate name followed by the macro name. If shorter, then |
| // it means that `relative` was empty, which is an error. |
| debug!("macro path cannot be empty!"); |
| return Err(HrefError::NotInExternalCache); |
| } |
| |
| if let Some(last) = path.last_mut() { |
| *last = Symbol::intern(&format!("macro.{}.html", last.as_str())); |
| } |
| |
| let url = match cache.extern_locations[&def_id.krate] { |
| ExternalLocation::Remote(ref s) => { |
| // `ExternalLocation::Remote` always end with a `/`. |
| format!("{s}{path}", path = path.iter().map(|p| p.as_str()).join("/")) |
| } |
| ExternalLocation::Local => { |
| // `root_path` always end with a `/`. |
| format!( |
| "{root_path}{crate_name}/{path}", |
| root_path = root_path.unwrap_or(""), |
| path = path.iter().map(|p| p.as_str()).join("/") |
| ) |
| } |
| ExternalLocation::Unknown => { |
| debug!("crate {crate_name} not in cache when linkifying macros"); |
| return Err(HrefError::NotInExternalCache); |
| } |
| }; |
| Ok((url, ItemType::Macro, fqp)) |
| } |
| |
| pub(crate) fn href_with_root_path( |
| did: DefId, |
| cx: &Context<'_>, |
| root_path: Option<&str>, |
| ) -> Result<(String, ItemType, Vec<Symbol>), HrefError> { |
| let tcx = cx.tcx(); |
| let def_kind = tcx.def_kind(did); |
| let did = match def_kind { |
| DefKind::AssocTy | DefKind::AssocFn | DefKind::AssocConst | DefKind::Variant => { |
| // documented on their parent's page |
| tcx.parent(did) |
| } |
| DefKind::ExternCrate => { |
| // Link to the crate itself, not the `extern crate` item. |
| if let Some(local_did) = did.as_local() { |
| tcx.extern_mod_stmt_cnum(local_did).unwrap_or(LOCAL_CRATE).as_def_id() |
| } else { |
| did |
| } |
| } |
| _ => did, |
| }; |
| let cache = cx.cache(); |
| let relative_to = &cx.current; |
| fn to_module_fqp(shortty: ItemType, fqp: &[Symbol]) -> &[Symbol] { |
| if shortty == ItemType::Module { fqp } else { &fqp[..fqp.len() - 1] } |
| } |
| |
| if !did.is_local() |
| && !cache.effective_visibilities.is_directly_public(tcx, did) |
| && !cache.document_private |
| && !cache.primitive_locations.values().any(|&id| id == did) |
| { |
| return Err(HrefError::Private); |
| } |
| |
| let mut is_remote = false; |
| let (fqp, shortty, mut url_parts) = match cache.paths.get(&did) { |
| Some(&(ref fqp, shortty)) => (fqp, shortty, { |
| let module_fqp = to_module_fqp(shortty, fqp.as_slice()); |
| debug!(?fqp, ?shortty, ?module_fqp); |
| href_relative_parts(module_fqp, relative_to).collect() |
| }), |
| None => { |
| if let Some(&(ref fqp, shortty)) = cache.external_paths.get(&did) { |
| let module_fqp = to_module_fqp(shortty, fqp); |
| ( |
| fqp, |
| shortty, |
| match cache.extern_locations[&did.krate] { |
| ExternalLocation::Remote(ref s) => { |
| is_remote = true; |
| let s = s.trim_end_matches('/'); |
| let mut builder = UrlPartsBuilder::singleton(s); |
| builder.extend(module_fqp.iter().copied()); |
| builder |
| } |
| ExternalLocation::Local => { |
| href_relative_parts(module_fqp, relative_to).collect() |
| } |
| ExternalLocation::Unknown => return Err(HrefError::DocumentationNotBuilt), |
| }, |
| ) |
| } else if matches!(def_kind, DefKind::Macro(_)) { |
| return generate_macro_def_id_path(did, cx, root_path); |
| } else { |
| return Err(HrefError::NotInExternalCache); |
| } |
| } |
| }; |
| if !is_remote && let Some(root_path) = root_path { |
| let root = root_path.trim_end_matches('/'); |
| url_parts.push_front(root); |
| } |
| debug!(?url_parts); |
| match shortty { |
| ItemType::Module => { |
| url_parts.push("index.html"); |
| } |
| _ => { |
| let prefix = shortty.as_str(); |
| let last = fqp.last().unwrap(); |
| url_parts.push_fmt(format_args!("{prefix}.{last}.html")); |
| } |
| } |
| Ok((url_parts.finish(), shortty, fqp.to_vec())) |
| } |
| |
| pub(crate) fn href( |
| did: DefId, |
| cx: &Context<'_>, |
| ) -> Result<(String, ItemType, Vec<Symbol>), HrefError> { |
| href_with_root_path(did, cx, None) |
| } |
| |
| /// Both paths should only be modules. |
| /// This is because modules get their own directories; that is, `std::vec` and `std::vec::Vec` will |
| /// both need `../iter/trait.Iterator.html` to get at the iterator trait. |
| pub(crate) fn href_relative_parts<'fqp>( |
| fqp: &'fqp [Symbol], |
| relative_to_fqp: &[Symbol], |
| ) -> Box<dyn Iterator<Item = Symbol> + 'fqp> { |
| for (i, (f, r)) in fqp.iter().zip(relative_to_fqp.iter()).enumerate() { |
| // e.g. linking to std::iter from std::vec (`dissimilar_part_count` will be 1) |
| if f != r { |
| let dissimilar_part_count = relative_to_fqp.len() - i; |
| let fqp_module = &fqp[i..fqp.len()]; |
| return Box::new( |
| iter::repeat(sym::dotdot) |
| .take(dissimilar_part_count) |
| .chain(fqp_module.iter().copied()), |
| ); |
| } |
| } |
| // e.g. linking to std::sync::atomic from std::sync |
| if relative_to_fqp.len() < fqp.len() { |
| Box::new(fqp[relative_to_fqp.len()..fqp.len()].iter().copied()) |
| // e.g. linking to std::sync from std::sync::atomic |
| } else if fqp.len() < relative_to_fqp.len() { |
| let dissimilar_part_count = relative_to_fqp.len() - fqp.len(); |
| Box::new(iter::repeat(sym::dotdot).take(dissimilar_part_count)) |
| // linking to the same module |
| } else { |
| Box::new(iter::empty()) |
| } |
| } |
| |
| pub(crate) fn link_tooltip(did: DefId, fragment: &Option<UrlFragment>, cx: &Context<'_>) -> String { |
| let cache = cx.cache(); |
| let Some((fqp, shortty)) = cache.paths.get(&did).or_else(|| cache.external_paths.get(&did)) |
| else { |
| return String::new(); |
| }; |
| let mut buf = Buffer::new(); |
| let fqp = if *shortty == ItemType::Primitive { |
| // primitives are documented in a crate, but not actually part of it |
| &fqp[fqp.len() - 1..] |
| } else { |
| &fqp |
| }; |
| if let &Some(UrlFragment::Item(id)) = fragment { |
| write!(buf, "{} ", cx.tcx().def_descr(id)); |
| for component in fqp { |
| write!(buf, "{component}::"); |
| } |
| write!(buf, "{}", cx.tcx().item_name(id)); |
| } else if !fqp.is_empty() { |
| let mut fqp_it = fqp.into_iter(); |
| write!(buf, "{shortty} {}", fqp_it.next().unwrap()); |
| for component in fqp_it { |
| write!(buf, "::{component}"); |
| } |
| } |
| buf.into_inner() |
| } |
| |
| /// Used to render a [`clean::Path`]. |
| fn resolved_path<'cx>( |
| w: &mut fmt::Formatter<'_>, |
| did: DefId, |
| path: &clean::Path, |
| print_all: bool, |
| use_absolute: bool, |
| cx: &'cx Context<'_>, |
| ) -> fmt::Result { |
| let last = path.segments.last().unwrap(); |
| |
| if print_all { |
| for seg in &path.segments[..path.segments.len() - 1] { |
| write!(w, "{}::", if seg.name == kw::PathRoot { "" } else { seg.name.as_str() })?; |
| } |
| } |
| if w.alternate() { |
| write!(w, "{}{:#}", &last.name, last.args.print(cx))?; |
| } else { |
| let path = if use_absolute { |
| if let Ok((_, _, fqp)) = href(did, cx) { |
| format!( |
| "{path}::{anchor}", |
| path = join_with_double_colon(&fqp[..fqp.len() - 1]), |
| anchor = anchor(did, *fqp.last().unwrap(), cx) |
| ) |
| } else { |
| last.name.to_string() |
| } |
| } else { |
| anchor(did, last.name, cx).to_string() |
| }; |
| write!(w, "{path}{args}", args = last.args.print(cx))?; |
| } |
| Ok(()) |
| } |
| |
| fn primitive_link( |
| f: &mut fmt::Formatter<'_>, |
| prim: clean::PrimitiveType, |
| name: &str, |
| cx: &Context<'_>, |
| ) -> fmt::Result { |
| primitive_link_fragment(f, prim, name, "", cx) |
| } |
| |
| fn primitive_link_fragment( |
| f: &mut fmt::Formatter<'_>, |
| prim: clean::PrimitiveType, |
| name: &str, |
| fragment: &str, |
| cx: &Context<'_>, |
| ) -> fmt::Result { |
| let m = &cx.cache(); |
| let mut needs_termination = false; |
| if !f.alternate() { |
| match m.primitive_locations.get(&prim) { |
| Some(&def_id) if def_id.is_local() => { |
| let len = cx.current.len(); |
| let len = if len == 0 { 0 } else { len - 1 }; |
| write!( |
| f, |
| "<a class=\"primitive\" href=\"{}primitive.{}.html{fragment}\">", |
| "../".repeat(len), |
| prim.as_sym() |
| )?; |
| needs_termination = true; |
| } |
| Some(&def_id) => { |
| let loc = match m.extern_locations[&def_id.krate] { |
| ExternalLocation::Remote(ref s) => { |
| let cname_sym = ExternalCrate { crate_num: def_id.krate }.name(cx.tcx()); |
| let builder: UrlPartsBuilder = |
| [s.as_str().trim_end_matches('/'), cname_sym.as_str()] |
| .into_iter() |
| .collect(); |
| Some(builder) |
| } |
| ExternalLocation::Local => { |
| let cname_sym = ExternalCrate { crate_num: def_id.krate }.name(cx.tcx()); |
| Some(if cx.current.first() == Some(&cname_sym) { |
| iter::repeat(sym::dotdot).take(cx.current.len() - 1).collect() |
| } else { |
| iter::repeat(sym::dotdot) |
| .take(cx.current.len()) |
| .chain(iter::once(cname_sym)) |
| .collect() |
| }) |
| } |
| ExternalLocation::Unknown => None, |
| }; |
| if let Some(mut loc) = loc { |
| loc.push_fmt(format_args!("primitive.{}.html", prim.as_sym())); |
| write!(f, "<a class=\"primitive\" href=\"{}{fragment}\">", loc.finish())?; |
| needs_termination = true; |
| } |
| } |
| None => {} |
| } |
| } |
| f.write_str(name)?; |
| if needs_termination { |
| write!(f, "</a>")?; |
| } |
| Ok(()) |
| } |
| |
| /// Helper to render type parameters |
| fn tybounds<'a, 'tcx: 'a>( |
| bounds: &'a [clean::PolyTrait], |
| lt: &'a Option<clean::Lifetime>, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| display_fn(move |f| { |
| for (i, bound) in bounds.iter().enumerate() { |
| if i > 0 { |
| write!(f, " + ")?; |
| } |
| |
| fmt::Display::fmt(&bound.print(cx), f)?; |
| } |
| |
| if let Some(lt) = lt { |
| write!(f, " + ")?; |
| fmt::Display::fmt(<.print(), f)?; |
| } |
| Ok(()) |
| }) |
| } |
| |
| pub(crate) fn anchor<'a, 'cx: 'a>( |
| did: DefId, |
| text: Symbol, |
| cx: &'cx Context<'_>, |
| ) -> impl fmt::Display + 'a { |
| let parts = href(did, cx); |
| display_fn(move |f| { |
| if let Ok((url, short_ty, fqp)) = parts { |
| write!( |
| f, |
| r#"<a class="{short_ty}" href="{url}" title="{short_ty} {path}">{text}</a>"#, |
| path = join_with_double_colon(&fqp), |
| ) |
| } else { |
| f.write_str(text.as_str()) |
| } |
| }) |
| } |
| |
| fn fmt_type<'cx>( |
| t: &clean::Type, |
| f: &mut fmt::Formatter<'_>, |
| use_absolute: bool, |
| cx: &'cx Context<'_>, |
| ) -> fmt::Result { |
| trace!("fmt_type(t = {t:?})"); |
| |
| match *t { |
| clean::Generic(name) => f.write_str(name.as_str()), |
| clean::Type::Path { ref path } => { |
| // Paths like `T::Output` and `Self::Output` should be rendered with all segments. |
| let did = path.def_id(); |
| resolved_path(f, did, path, path.is_assoc_ty(), use_absolute, cx) |
| } |
| clean::DynTrait(ref bounds, ref lt) => { |
| f.write_str("dyn ")?; |
| fmt::Display::fmt(&tybounds(bounds, lt, cx), f) |
| } |
| clean::Infer => write!(f, "_"), |
| clean::Primitive(clean::PrimitiveType::Never) => { |
| primitive_link(f, PrimitiveType::Never, "!", cx) |
| } |
| clean::Primitive(prim) => primitive_link(f, prim, prim.as_sym().as_str(), cx), |
| clean::BareFunction(ref decl) => { |
| if f.alternate() { |
| write!( |
| f, |
| "{:#}{}{:#}fn{:#}", |
| decl.print_hrtb_with_space(cx), |
| decl.unsafety.print_with_space(), |
| print_abi_with_space(decl.abi), |
| decl.decl.print(cx), |
| ) |
| } else { |
| write!( |
| f, |
| "{}{}{}", |
| decl.print_hrtb_with_space(cx), |
| decl.unsafety.print_with_space(), |
| print_abi_with_space(decl.abi) |
| )?; |
| primitive_link(f, PrimitiveType::Fn, "fn", cx)?; |
| write!(f, "{}", decl.decl.print(cx)) |
| } |
| } |
| clean::Tuple(ref typs) => { |
| match &typs[..] { |
| &[] => primitive_link(f, PrimitiveType::Unit, "()", cx), |
| [one] => { |
| if let clean::Generic(name) = one { |
| primitive_link(f, PrimitiveType::Tuple, &format!("({name},)"), cx) |
| } else { |
| write!(f, "(")?; |
| // Carry `f.alternate()` into this display w/o branching manually. |
| fmt::Display::fmt(&one.print(cx), f)?; |
| write!(f, ",)") |
| } |
| } |
| many => { |
| let generic_names: Vec<Symbol> = many |
| .iter() |
| .filter_map(|t| match t { |
| clean::Generic(name) => Some(*name), |
| _ => None, |
| }) |
| .collect(); |
| let is_generic = generic_names.len() == many.len(); |
| if is_generic { |
| primitive_link( |
| f, |
| PrimitiveType::Tuple, |
| &format!("({})", generic_names.iter().map(|s| s.as_str()).join(", ")), |
| cx, |
| ) |
| } else { |
| write!(f, "(")?; |
| for (i, item) in many.iter().enumerate() { |
| if i != 0 { |
| write!(f, ", ")?; |
| } |
| // Carry `f.alternate()` into this display w/o branching manually. |
| fmt::Display::fmt(&item.print(cx), f)?; |
| } |
| write!(f, ")") |
| } |
| } |
| } |
| } |
| clean::Slice(ref t) => match **t { |
| clean::Generic(name) => { |
| primitive_link(f, PrimitiveType::Slice, &format!("[{name}]"), cx) |
| } |
| _ => { |
| write!(f, "[")?; |
| fmt::Display::fmt(&t.print(cx), f)?; |
| write!(f, "]") |
| } |
| }, |
| clean::Array(ref t, ref n) => match **t { |
| clean::Generic(name) if !f.alternate() => primitive_link( |
| f, |
| PrimitiveType::Array, |
| &format!("[{name}; {n}]", n = Escape(n)), |
| cx, |
| ), |
| _ => { |
| write!(f, "[")?; |
| fmt::Display::fmt(&t.print(cx), f)?; |
| if f.alternate() { |
| write!(f, "; {n}")?; |
| } else { |
| write!(f, "; ")?; |
| primitive_link(f, PrimitiveType::Array, &format!("{n}", n = Escape(n)), cx)?; |
| } |
| write!(f, "]") |
| } |
| }, |
| clean::RawPointer(m, ref t) => { |
| let m = match m { |
| hir::Mutability::Mut => "mut", |
| hir::Mutability::Not => "const", |
| }; |
| |
| if matches!(**t, clean::Generic(_)) || t.is_assoc_ty() { |
| let text = if f.alternate() { |
| format!("*{m} {ty:#}", ty = t.print(cx)) |
| } else { |
| format!("*{m} {ty}", ty = t.print(cx)) |
| }; |
| primitive_link(f, clean::PrimitiveType::RawPointer, &text, cx) |
| } else { |
| primitive_link(f, clean::PrimitiveType::RawPointer, &format!("*{m} "), cx)?; |
| fmt::Display::fmt(&t.print(cx), f) |
| } |
| } |
| clean::BorrowedRef { lifetime: ref l, mutability, type_: ref ty } => { |
| let lt = match l { |
| Some(l) => format!("{} ", l.print()), |
| _ => String::new(), |
| }; |
| let m = mutability.print_with_space(); |
| let amp = if f.alternate() { "&" } else { "&" }; |
| |
| if let clean::Generic(name) = **ty { |
| return primitive_link( |
| f, |
| PrimitiveType::Reference, |
| &format!("{amp}{lt}{m}{name}"), |
| cx, |
| ); |
| } |
| |
| write!(f, "{amp}{lt}{m}")?; |
| |
| let needs_parens = match **ty { |
| clean::DynTrait(ref bounds, ref trait_lt) |
| if bounds.len() > 1 || trait_lt.is_some() => |
| { |
| true |
| } |
| clean::ImplTrait(ref bounds) if bounds.len() > 1 => true, |
| _ => false, |
| }; |
| if needs_parens { |
| f.write_str("(")?; |
| } |
| fmt_type(ty, f, use_absolute, cx)?; |
| if needs_parens { |
| f.write_str(")")?; |
| } |
| Ok(()) |
| } |
| clean::ImplTrait(ref bounds) => { |
| if f.alternate() { |
| write!(f, "impl {:#}", print_generic_bounds(bounds, cx)) |
| } else { |
| write!(f, "impl {}", print_generic_bounds(bounds, cx)) |
| } |
| } |
| clean::QPath(box clean::QPathData { |
| ref assoc, |
| ref self_type, |
| ref trait_, |
| should_show_cast, |
| }) => { |
| // FIXME(inherent_associated_types): Once we support non-ADT self-types (#106719), |
| // we need to surround them with angle brackets in some cases (e.g. `<dyn …>::P`). |
| |
| if f.alternate() { |
| if let Some(trait_) = trait_ && should_show_cast { |
| write!(f, "<{:#} as {:#}>::", self_type.print(cx), trait_.print(cx))? |
| } else { |
| write!(f, "{:#}::", self_type.print(cx))? |
| } |
| } else { |
| if let Some(trait_) = trait_ && should_show_cast { |
| write!(f, "<{} as {}>::", self_type.print(cx), trait_.print(cx))? |
| } else { |
| write!(f, "{}::", self_type.print(cx))? |
| } |
| }; |
| // It's pretty unsightly to look at `<A as B>::C` in output, and |
| // we've got hyperlinking on our side, so try to avoid longer |
| // notation as much as possible by making `C` a hyperlink to trait |
| // `B` to disambiguate. |
| // |
| // FIXME: this is still a lossy conversion and there should probably |
| // be a better way of representing this in general? Most of |
| // the ugliness comes from inlining across crates where |
| // everything comes in as a fully resolved QPath (hard to |
| // look at). |
| if !f.alternate() { |
| // FIXME(inherent_associated_types): We always link to the very first associated |
| // type (in respect to source order) that bears the given name (`assoc.name`) and that is |
| // affiliated with the computed `DefId`. This is obviously incorrect when we have |
| // multiple impl blocks. Ideally, we would thread the `DefId` of the assoc ty itself |
| // through here and map it to the corresponding HTML ID that was generated by |
| // `render::Context::derive_id` when the impl blocks were rendered. |
| // There is no such mapping unfortunately. |
| // As a hack, we could badly imitate `derive_id` here by keeping *count* when looking |
| // for the assoc ty `DefId` in `tcx.associated_items(self_ty_did).in_definition_order()` |
| // considering privacy, `doc(hidden)`, etc. |
| // I don't feel like that right now :cold_sweat:. |
| |
| let parent_href = match trait_ { |
| Some(trait_) => href(trait_.def_id(), cx).ok(), |
| None => self_type.def_id(cx.cache()).and_then(|did| href(did, cx).ok()), |
| }; |
| |
| if let Some((url, _, path)) = parent_href { |
| write!( |
| f, |
| "<a class=\"associatedtype\" href=\"{url}#{shortty}.{name}\" \ |
| title=\"type {path}::{name}\">{name}</a>", |
| shortty = ItemType::AssocType, |
| name = assoc.name, |
| path = join_with_double_colon(&path), |
| ) |
| } else { |
| write!(f, "{}", assoc.name) |
| } |
| } else { |
| write!(f, "{}", assoc.name) |
| }?; |
| |
| // Carry `f.alternate()` into this display w/o branching manually. |
| fmt::Display::fmt(&assoc.args.print(cx), f) |
| } |
| } |
| } |
| |
| impl clean::Type { |
| pub(crate) fn print<'b, 'a: 'b, 'tcx: 'a>( |
| &'a self, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'b + Captures<'tcx> { |
| display_fn(move |f| fmt_type(self, f, false, cx)) |
| } |
| } |
| |
| impl clean::Path { |
| pub(crate) fn print<'b, 'a: 'b, 'tcx: 'a>( |
| &'a self, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'b + Captures<'tcx> { |
| display_fn(move |f| resolved_path(f, self.def_id(), self, false, false, cx)) |
| } |
| } |
| |
| impl clean::Impl { |
| pub(crate) fn print<'a, 'tcx: 'a>( |
| &'a self, |
| use_absolute: bool, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| display_fn(move |f| { |
| if f.alternate() { |
| write!(f, "impl{:#} ", self.generics.print(cx))?; |
| } else { |
| write!(f, "impl{} ", self.generics.print(cx))?; |
| } |
| |
| if let Some(ref ty) = self.trait_ { |
| match self.polarity { |
| ty::ImplPolarity::Positive | ty::ImplPolarity::Reservation => {} |
| ty::ImplPolarity::Negative => write!(f, "!")?, |
| } |
| fmt::Display::fmt(&ty.print(cx), f)?; |
| write!(f, " for ")?; |
| } |
| |
| if let clean::Type::Tuple(types) = &self.for_ && |
| let [clean::Type::Generic(name)] = &types[..] && |
| (self.kind.is_fake_variadic() || self.kind.is_auto()) |
| { |
| // Hardcoded anchor library/core/src/primitive_docs.rs |
| // Link should match `# Trait implementations` |
| primitive_link_fragment(f, PrimitiveType::Tuple, &format!("({name}₁, {name}₂, …, {name}ₙ)"), "#trait-implementations-1", cx)?; |
| } else if let clean::BareFunction(bare_fn) = &self.for_ && |
| let [clean::Argument { type_: clean::Type::Generic(name), .. }] = &bare_fn.decl.inputs.values[..] && |
| (self.kind.is_fake_variadic() || self.kind.is_auto()) |
| { |
| // Hardcoded anchor library/core/src/primitive_docs.rs |
| // Link should match `# Trait implementations` |
| |
| let hrtb = bare_fn.print_hrtb_with_space(cx); |
| let unsafety = bare_fn.unsafety.print_with_space(); |
| let abi = print_abi_with_space(bare_fn.abi); |
| if f.alternate() { |
| write!( |
| f, |
| "{hrtb:#}{unsafety}{abi:#}", |
| )?; |
| } else { |
| write!( |
| f, |
| "{hrtb}{unsafety}{abi}", |
| )?; |
| } |
| let ellipsis = if bare_fn.decl.c_variadic { |
| ", ..." |
| } else { |
| "" |
| }; |
| primitive_link_fragment(f, PrimitiveType::Tuple, &format!("fn ({name}₁, {name}₂, …, {name}ₙ{ellipsis})"), "#trait-implementations-1", cx)?; |
| // Write output. |
| if !bare_fn.decl.output.is_unit() { |
| write!(f, " -> ")?; |
| fmt_type(&bare_fn.decl.output, f, use_absolute, cx)?; |
| } |
| } else if let Some(ty) = self.kind.as_blanket_ty() { |
| fmt_type(ty, f, use_absolute, cx)?; |
| } else { |
| fmt_type(&self.for_, f, use_absolute, cx)?; |
| } |
| |
| fmt::Display::fmt(&print_where_clause(&self.generics, cx, 0, Ending::Newline), f)?; |
| Ok(()) |
| }) |
| } |
| } |
| |
| impl clean::Arguments { |
| pub(crate) fn print<'a, 'tcx: 'a>( |
| &'a self, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| display_fn(move |f| { |
| for (i, input) in self.values.iter().enumerate() { |
| write!(f, "{}: ", input.name)?; |
| |
| if f.alternate() { |
| write!(f, "{:#}", input.type_.print(cx))?; |
| } else { |
| write!(f, "{}", input.type_.print(cx))?; |
| } |
| if i + 1 < self.values.len() { |
| write!(f, ", ")?; |
| } |
| } |
| Ok(()) |
| }) |
| } |
| } |
| |
| impl clean::BareFunctionDecl { |
| fn print_hrtb_with_space<'a, 'tcx: 'a>( |
| &'a self, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| display_fn(move |f| { |
| if !self.generic_params.is_empty() { |
| write!( |
| f, |
| "for<{}> ", |
| comma_sep(self.generic_params.iter().map(|g| g.print(cx)), true) |
| ) |
| } else { |
| Ok(()) |
| } |
| }) |
| } |
| } |
| |
| // Implements Write but only counts the bytes "written". |
| struct WriteCounter(usize); |
| |
| impl std::fmt::Write for WriteCounter { |
| fn write_str(&mut self, s: &str) -> fmt::Result { |
| self.0 += s.len(); |
| Ok(()) |
| } |
| } |
| |
| // Implements Display by emitting the given number of spaces. |
| struct Indent(usize); |
| |
| impl fmt::Display for Indent { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| (0..self.0).for_each(|_| { |
| f.write_char(' ').unwrap(); |
| }); |
| Ok(()) |
| } |
| } |
| |
| impl clean::FnDecl { |
| pub(crate) fn print<'b, 'a: 'b, 'tcx: 'a>( |
| &'a self, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'b + Captures<'tcx> { |
| display_fn(move |f| { |
| let ellipsis = if self.c_variadic { ", ..." } else { "" }; |
| if f.alternate() { |
| write!( |
| f, |
| "({args:#}{ellipsis}){arrow:#}", |
| args = self.inputs.print(cx), |
| ellipsis = ellipsis, |
| arrow = self.print_output(cx) |
| ) |
| } else { |
| write!( |
| f, |
| "({args}{ellipsis}){arrow}", |
| args = self.inputs.print(cx), |
| ellipsis = ellipsis, |
| arrow = self.print_output(cx) |
| ) |
| } |
| }) |
| } |
| |
| /// * `header_len`: The length of the function header and name. In other words, the number of |
| /// characters in the function declaration up to but not including the parentheses. |
| /// This is expected to go into a `<pre>`/`code-header` block, so indentation and newlines |
| /// are preserved. |
| /// * `indent`: The number of spaces to indent each successive line with, if line-wrapping is |
| /// necessary. |
| pub(crate) fn full_print<'a, 'tcx: 'a>( |
| &'a self, |
| header_len: usize, |
| indent: usize, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| display_fn(move |f| { |
| // First, generate the text form of the declaration, with no line wrapping, and count the bytes. |
| let mut counter = WriteCounter(0); |
| write!(&mut counter, "{:#}", display_fn(|f| { self.inner_full_print(None, f, cx) })) |
| .unwrap(); |
| // If the text form was over 80 characters wide, we will line-wrap our output. |
| let line_wrapping_indent = |
| if header_len + counter.0 > 80 { Some(indent) } else { None }; |
| // Generate the final output. This happens to accept `{:#}` formatting to get textual |
| // output but in practice it is only formatted with `{}` to get HTML output. |
| self.inner_full_print(line_wrapping_indent, f, cx) |
| }) |
| } |
| |
| fn inner_full_print( |
| &self, |
| // For None, the declaration will not be line-wrapped. For Some(n), |
| // the declaration will be line-wrapped, with an indent of n spaces. |
| line_wrapping_indent: Option<usize>, |
| f: &mut fmt::Formatter<'_>, |
| cx: &Context<'_>, |
| ) -> fmt::Result { |
| let amp = if f.alternate() { "&" } else { "&" }; |
| |
| write!(f, "(")?; |
| if let Some(n) = line_wrapping_indent && !self.inputs.values.is_empty() { |
| write!(f, "\n{}", Indent(n + 4))?; |
| } |
| for (i, input) in self.inputs.values.iter().enumerate() { |
| if i > 0 { |
| match line_wrapping_indent { |
| None => write!(f, ", ")?, |
| Some(n) => write!(f, ",\n{}", Indent(n + 4))?, |
| }; |
| } |
| if let Some(selfty) = input.to_self() { |
| match selfty { |
| clean::SelfValue => { |
| write!(f, "self")?; |
| } |
| clean::SelfBorrowed(Some(ref lt), mutability) => { |
| write!( |
| f, |
| "{amp}{lifetime} {mutability}self", |
| lifetime = lt.print(), |
| mutability = mutability.print_with_space(), |
| )?; |
| } |
| clean::SelfBorrowed(None, mutability) => { |
| write!( |
| f, |
| "{amp}{mutability}self", |
| mutability = mutability.print_with_space(), |
| )?; |
| } |
| clean::SelfExplicit(ref typ) => { |
| write!(f, "self: ")?; |
| fmt::Display::fmt(&typ.print(cx), f)?; |
| } |
| } |
| } else { |
| if input.is_const { |
| write!(f, "const ")?; |
| } |
| write!(f, "{}: ", input.name)?; |
| fmt::Display::fmt(&input.type_.print(cx), f)?; |
| } |
| } |
| |
| if self.c_variadic { |
| match line_wrapping_indent { |
| None => write!(f, ", ...")?, |
| Some(n) => write!(f, "\n{}...", Indent(n + 4))?, |
| }; |
| } |
| |
| match line_wrapping_indent { |
| None => write!(f, ")")?, |
| Some(n) => write!(f, "\n{})", Indent(n))?, |
| }; |
| |
| fmt::Display::fmt(&self.print_output(cx), f)?; |
| Ok(()) |
| } |
| |
| fn print_output<'a, 'tcx: 'a>( |
| &'a self, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| display_fn(move |f| match &self.output { |
| clean::Tuple(tys) if tys.is_empty() => Ok(()), |
| ty if f.alternate() => { |
| write!(f, " -> {:#}", ty.print(cx)) |
| } |
| ty => write!(f, " -> {}", ty.print(cx)), |
| }) |
| } |
| } |
| |
| pub(crate) fn visibility_print_with_space<'a, 'tcx: 'a>( |
| visibility: Option<ty::Visibility<DefId>>, |
| item_did: ItemId, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| use std::fmt::Write as _; |
| |
| let to_print: Cow<'static, str> = match visibility { |
| None => "".into(), |
| Some(ty::Visibility::Public) => "pub ".into(), |
| Some(ty::Visibility::Restricted(vis_did)) => { |
| // FIXME(camelid): This may not work correctly if `item_did` is a module. |
| // However, rustdoc currently never displays a module's |
| // visibility, so it shouldn't matter. |
| let parent_module = find_nearest_parent_module(cx.tcx(), item_did.expect_def_id()); |
| |
| if vis_did.is_crate_root() { |
| "pub(crate) ".into() |
| } else if parent_module == Some(vis_did) { |
| // `pub(in foo)` where `foo` is the parent module |
| // is the same as no visibility modifier |
| "".into() |
| } else if parent_module.and_then(|parent| find_nearest_parent_module(cx.tcx(), parent)) |
| == Some(vis_did) |
| { |
| "pub(super) ".into() |
| } else { |
| let path = cx.tcx().def_path(vis_did); |
| debug!("path={path:?}"); |
| // modified from `resolved_path()` to work with `DefPathData` |
| let last_name = path.data.last().unwrap().data.get_opt_name().unwrap(); |
| let anchor = anchor(vis_did, last_name, cx); |
| |
| let mut s = "pub(in ".to_owned(); |
| for seg in &path.data[..path.data.len() - 1] { |
| let _ = write!(s, "{}::", seg.data.get_opt_name().unwrap()); |
| } |
| let _ = write!(s, "{anchor}) "); |
| s.into() |
| } |
| } |
| }; |
| display_fn(move |f| f.write_str(&to_print)) |
| } |
| |
| /// This function is the same as print_with_space, except that it renders no links. |
| /// It's used for macros' rendered source view, which is syntax highlighted and cannot have |
| /// any HTML in it. |
| pub(crate) fn visibility_to_src_with_space<'a, 'tcx: 'a>( |
| visibility: Option<ty::Visibility<DefId>>, |
| tcx: TyCtxt<'tcx>, |
| item_did: DefId, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| let to_print: Cow<'static, str> = match visibility { |
| None => "".into(), |
| Some(ty::Visibility::Public) => "pub ".into(), |
| Some(ty::Visibility::Restricted(vis_did)) => { |
| // FIXME(camelid): This may not work correctly if `item_did` is a module. |
| // However, rustdoc currently never displays a module's |
| // visibility, so it shouldn't matter. |
| let parent_module = find_nearest_parent_module(tcx, item_did); |
| |
| if vis_did.is_crate_root() { |
| "pub(crate) ".into() |
| } else if parent_module == Some(vis_did) { |
| // `pub(in foo)` where `foo` is the parent module |
| // is the same as no visibility modifier |
| "".into() |
| } else if parent_module.and_then(|parent| find_nearest_parent_module(tcx, parent)) |
| == Some(vis_did) |
| { |
| "pub(super) ".into() |
| } else { |
| format!("pub(in {}) ", tcx.def_path_str(vis_did)).into() |
| } |
| } |
| }; |
| display_fn(move |f| f.write_str(&to_print)) |
| } |
| |
| pub(crate) trait PrintWithSpace { |
| fn print_with_space(&self) -> &str; |
| } |
| |
| impl PrintWithSpace for hir::Unsafety { |
| fn print_with_space(&self) -> &str { |
| match self { |
| hir::Unsafety::Unsafe => "unsafe ", |
| hir::Unsafety::Normal => "", |
| } |
| } |
| } |
| |
| impl PrintWithSpace for hir::IsAsync { |
| fn print_with_space(&self) -> &str { |
| match self { |
| hir::IsAsync::Async(_) => "async ", |
| hir::IsAsync::NotAsync => "", |
| } |
| } |
| } |
| |
| impl PrintWithSpace for hir::Mutability { |
| fn print_with_space(&self) -> &str { |
| match self { |
| hir::Mutability::Not => "", |
| hir::Mutability::Mut => "mut ", |
| } |
| } |
| } |
| |
| pub(crate) fn print_constness_with_space( |
| c: &hir::Constness, |
| s: Option<ConstStability>, |
| ) -> &'static str { |
| match (c, s) { |
| // const stable or when feature(staged_api) is not set |
| ( |
| hir::Constness::Const, |
| Some(ConstStability { level: StabilityLevel::Stable { .. }, .. }), |
| ) |
| | (hir::Constness::Const, None) => "const ", |
| // const unstable or not const |
| _ => "", |
| } |
| } |
| |
| impl clean::Import { |
| pub(crate) fn print<'a, 'tcx: 'a>( |
| &'a self, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| display_fn(move |f| match self.kind { |
| clean::ImportKind::Simple(name) => { |
| if name == self.source.path.last() { |
| write!(f, "use {};", self.source.print(cx)) |
| } else { |
| write!(f, "use {source} as {name};", source = self.source.print(cx)) |
| } |
| } |
| clean::ImportKind::Glob => { |
| if self.source.path.segments.is_empty() { |
| write!(f, "use *;") |
| } else { |
| write!(f, "use {}::*;", self.source.print(cx)) |
| } |
| } |
| }) |
| } |
| } |
| |
| impl clean::ImportSource { |
| pub(crate) fn print<'a, 'tcx: 'a>( |
| &'a self, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| display_fn(move |f| match self.did { |
| Some(did) => resolved_path(f, did, &self.path, true, false, cx), |
| _ => { |
| for seg in &self.path.segments[..self.path.segments.len() - 1] { |
| write!(f, "{}::", seg.name)?; |
| } |
| let name = self.path.last(); |
| if let hir::def::Res::PrimTy(p) = self.path.res { |
| primitive_link(f, PrimitiveType::from(p), name.as_str(), cx)?; |
| } else { |
| f.write_str(name.as_str())?; |
| } |
| Ok(()) |
| } |
| }) |
| } |
| } |
| |
| impl clean::TypeBinding { |
| pub(crate) fn print<'a, 'tcx: 'a>( |
| &'a self, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| display_fn(move |f| { |
| f.write_str(self.assoc.name.as_str())?; |
| if f.alternate() { |
| write!(f, "{:#}", self.assoc.args.print(cx))?; |
| } else { |
| write!(f, "{}", self.assoc.args.print(cx))?; |
| } |
| match self.kind { |
| clean::TypeBindingKind::Equality { ref term } => { |
| if f.alternate() { |
| write!(f, " = {:#}", term.print(cx))?; |
| } else { |
| write!(f, " = {}", term.print(cx))?; |
| } |
| } |
| clean::TypeBindingKind::Constraint { ref bounds } => { |
| if !bounds.is_empty() { |
| if f.alternate() { |
| write!(f, ": {:#}", print_generic_bounds(bounds, cx))?; |
| } else { |
| write!(f, ": {}", print_generic_bounds(bounds, cx))?; |
| } |
| } |
| } |
| } |
| Ok(()) |
| }) |
| } |
| } |
| |
| pub(crate) fn print_abi_with_space(abi: Abi) -> impl fmt::Display { |
| display_fn(move |f| { |
| let quot = if f.alternate() { "\"" } else { """ }; |
| match abi { |
| Abi::Rust => Ok(()), |
| abi => write!(f, "extern {0}{1}{0} ", quot, abi.name()), |
| } |
| }) |
| } |
| |
| pub(crate) fn print_default_space<'a>(v: bool) -> &'a str { |
| if v { "default " } else { "" } |
| } |
| |
| impl clean::GenericArg { |
| pub(crate) fn print<'a, 'tcx: 'a>( |
| &'a self, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| display_fn(move |f| match self { |
| clean::GenericArg::Lifetime(lt) => fmt::Display::fmt(<.print(), f), |
| clean::GenericArg::Type(ty) => fmt::Display::fmt(&ty.print(cx), f), |
| clean::GenericArg::Const(ct) => fmt::Display::fmt(&ct.print(cx.tcx()), f), |
| clean::GenericArg::Infer => fmt::Display::fmt("_", f), |
| }) |
| } |
| } |
| |
| impl clean::types::Term { |
| pub(crate) fn print<'a, 'tcx: 'a>( |
| &'a self, |
| cx: &'a Context<'tcx>, |
| ) -> impl fmt::Display + 'a + Captures<'tcx> { |
| display_fn(move |f| match self { |
| clean::types::Term::Type(ty) => fmt::Display::fmt(&ty.print(cx), f), |
| clean::types::Term::Constant(ct) => fmt::Display::fmt(&ct.print(cx.tcx()), f), |
| }) |
| } |
| } |
| |
| pub(crate) fn display_fn( |
| f: impl FnOnce(&mut fmt::Formatter<'_>) -> fmt::Result, |
| ) -> impl fmt::Display { |
| struct WithFormatter<F>(Cell<Option<F>>); |
| |
| impl<F> fmt::Display for WithFormatter<F> |
| where |
| F: FnOnce(&mut fmt::Formatter<'_>) -> fmt::Result, |
| { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| (self.0.take()).unwrap()(f) |
| } |
| } |
| |
| WithFormatter(Cell::new(Some(f))) |
| } |
