src/librustdoc/html/format.rs

   1 // Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 //! HTML formatting module
  12 //!
  13 //! This module contains a large number of `fmt::Display` implementations for
  14 //! various types in `rustdoc::clean`. These implementations all currently
  15 //! assume that HTML output is desired, although it may be possible to redesign
  16 //! them in the future to instead emit any format desired.
  17
  18 use std::fmt;
  19 use std::iter::repeat;
  20
  21 use rustc::middle::def_id::{DefId, LOCAL_CRATE};
  22 use syntax::abi::Abi;
  23 use syntax::ast;
  24 use rustc_front::hir;
  25
  26 use clean;
  27 use html::item_type::ItemType;
  28 use html::render;
  29 use html::render::{cache, CURRENT_LOCATION_KEY};
  30
  31 /// Helper to render an optional visibility with a space after it (if the
  32 /// visibility is preset)
  33 #[derive(Copy, Clone)]
  34 pub struct VisSpace(pub Option<hir::Visibility>);
  35 /// Similarly to VisSpace, this structure is used to render a function style with a
  36 /// space after it.
  37 #[derive(Copy, Clone)]
  38 pub struct UnsafetySpace(pub hir::Unsafety);
  39 /// Similarly to VisSpace, this structure is used to render a function constness
  40 /// with a space after it.
  41 #[derive(Copy, Clone)]
  42 pub struct ConstnessSpace(pub hir::Constness);
  43 /// Wrapper struct for properly emitting a method declaration.
  44 pub struct Method<'a>(pub &'a clean::SelfTy, pub &'a clean::FnDecl);
  45 /// Similar to VisSpace, but used for mutability
  46 #[derive(Copy, Clone)]
  47 pub struct MutableSpace(pub clean::Mutability);
  48 /// Similar to VisSpace, but used for mutability
  49 #[derive(Copy, Clone)]
  50 pub struct RawMutableSpace(pub clean::Mutability);
  51 /// Wrapper struct for emitting a where clause from Generics.
  52 pub struct WhereClause<'a>(pub &'a clean::Generics);
  53 /// Wrapper struct for emitting type parameter bounds.
  54 pub struct TyParamBounds<'a>(pub &'a [clean::TyParamBound]);
  55 /// Wrapper struct for emitting a comma-separated list of items
  56 pub struct CommaSep<'a, T: 'a>(pub &'a [T]);
  57 pub struct AbiSpace(pub Abi);
  58
  59 impl VisSpace {
  60     pub fn get(&self) -> Option<hir::Visibility> {
  61         let VisSpace(v) = *self; v
  62     }
  63 }
  64
  65 impl UnsafetySpace {
  66     pub fn get(&self) -> hir::Unsafety {
  67         let UnsafetySpace(v) = *self; v
  68     }
  69 }
  70
  71 impl ConstnessSpace {
  72     pub fn get(&self) -> hir::Constness {
  73         let ConstnessSpace(v) = *self; v
  74     }
  75 }
  76
  77 impl<'a, T: fmt::Display> fmt::Display for CommaSep<'a, T> {
  78     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  79         for (i, item) in self.0.iter().enumerate() {
  80             if i != 0 { try!(write!(f, ", ")); }
  81             try!(write!(f, "{}", item));
  82         }
  83         Ok(())
  84     }
  85 }
  86
  87 impl<'a> fmt::Display for TyParamBounds<'a> {
  88     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  89         let &TyParamBounds(bounds) = self;
  90         for (i, bound) in bounds.iter().enumerate() {
  91             if i > 0 {
  92                 try!(f.write_str(" + "));
  93             }
  94             try!(write!(f, "{}", *bound));
  95         }
  96         Ok(())
  97     }
  98 }
  99
 100 impl fmt::Display for clean::Generics {
 101     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 102         if self.lifetimes.is_empty() && self.type_params.is_empty() { return Ok(()) }
 103         try!(f.write_str("&lt;"));
 104
 105         for (i, life) in self.lifetimes.iter().enumerate() {
 106             if i > 0 {
 107                 try!(f.write_str(", "));
 108             }
 109             try!(write!(f, "{}", *life));
 110         }
 111
 112         if !self.type_params.is_empty() {
 113             if !self.lifetimes.is_empty() {
 114                 try!(f.write_str(", "));
 115             }
 116             for (i, tp) in self.type_params.iter().enumerate() {
 117                 if i > 0 {
 118                     try!(f.write_str(", "))
 119                 }
 120                 try!(f.write_str(&tp.name));
 121
 122                 if !tp.bounds.is_empty() {
 123                     try!(write!(f, ": {}", TyParamBounds(&tp.bounds)));
 124                 }
 125
 126                 match tp.default {
 127                     Some(ref ty) => { try!(write!(f, " = {}", ty)); },
 128                     None => {}
 129                 };
 130             }
 131         }
 132         try!(f.write_str("&gt;"));
 133         Ok(())
 134     }
 135 }
 136
 137 impl<'a> fmt::Display for WhereClause<'a> {
 138     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 139         let &WhereClause(gens) = self;
 140         if gens.where_predicates.is_empty() {
 141             return Ok(());
 142         }
 143         try!(f.write_str(" <span class='where'>where "));
 144         for (i, pred) in gens.where_predicates.iter().enumerate() {
 145             if i > 0 {
 146                 try!(f.write_str(", "));
 147             }
 148             match pred {
 149                 &clean::WherePredicate::BoundPredicate { ref ty, ref bounds } => {
 150                     let bounds = bounds;
 151                     try!(write!(f, "{}: {}", ty, TyParamBounds(bounds)));
 152                 }
 153                 &clean::WherePredicate::RegionPredicate { ref lifetime,
 154                                                           ref bounds } => {
 155                     try!(write!(f, "{}: ", lifetime));
 156                     for (i, lifetime) in bounds.iter().enumerate() {
 157                         if i > 0 {
 158                             try!(f.write_str(" + "));
 159                         }
 160
 161                         try!(write!(f, "{}", lifetime));
 162                     }
 163                 }
 164                 &clean::WherePredicate::EqPredicate { ref lhs, ref rhs } => {
 165                     try!(write!(f, "{} == {}", lhs, rhs));
 166                 }
 167             }
 168         }
 169         try!(f.write_str("</span>"));
 170         Ok(())
 171     }
 172 }
 173
 174 impl fmt::Display for clean::Lifetime {
 175     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 176         try!(f.write_str(self.get_ref()));
 177         Ok(())
 178     }
 179 }
 180
 181 impl fmt::Display for clean::PolyTrait {
 182     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 183         if !self.lifetimes.is_empty() {
 184             try!(f.write_str("for&lt;"));
 185             for (i, lt) in self.lifetimes.iter().enumerate() {
 186                 if i > 0 {
 187                     try!(f.write_str(", "));
 188                 }
 189                 try!(write!(f, "{}", lt));
 190             }
 191             try!(f.write_str("&gt; "));
 192         }
 193         write!(f, "{}", self.trait_)
 194     }
 195 }
 196
 197 impl fmt::Display for clean::TyParamBound {
 198     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 199         match *self {
 200             clean::RegionBound(ref lt) => {
 201                 write!(f, "{}", *lt)
 202             }
 203             clean::TraitBound(ref ty, modifier) => {
 204                 let modifier_str = match modifier {
 205                     hir::TraitBoundModifier::None => "",
 206                     hir::TraitBoundModifier::Maybe => "?",
 207                 };
 208                 write!(f, "{}{}", modifier_str, *ty)
 209             }
 210         }
 211     }
 212 }
 213
 214 impl fmt::Display for clean::PathParameters {
 215     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 216         match *self {
 217             clean::PathParameters::AngleBracketed {
 218                 ref lifetimes, ref types, ref bindings
 219             } => {
 220                 if !lifetimes.is_empty() || !types.is_empty() || !bindings.is_empty() {
 221                     try!(f.write_str("&lt;"));
 222                     let mut comma = false;
 223                     for lifetime in lifetimes {
 224                         if comma {
 225                             try!(f.write_str(", "));
 226                         }
 227                         comma = true;
 228                         try!(write!(f, "{}", *lifetime));
 229                     }
 230                     for ty in types {
 231                         if comma {
 232                             try!(f.write_str(", "));
 233                         }
 234                         comma = true;
 235                         try!(write!(f, "{}", *ty));
 236                     }
 237                     for binding in bindings {
 238                         if comma {
 239                             try!(f.write_str(", "));
 240                         }
 241                         comma = true;
 242                         try!(write!(f, "{}", *binding));
 243                     }
 244                     try!(f.write_str("&gt;"));
 245                 }
 246             }
 247             clean::PathParameters::Parenthesized { ref inputs, ref output } => {
 248                 try!(f.write_str("("));
 249                 let mut comma = false;
 250                 for ty in inputs {
 251                     if comma {
 252                         try!(f.write_str(", "));
 253                     }
 254                     comma = true;
 255                     try!(write!(f, "{}", *ty));
 256                 }
 257                 try!(f.write_str(")"));
 258                 if let Some(ref ty) = *output {
 259                     try!(f.write_str(" -&gt; "));
 260                     try!(write!(f, "{}", ty));
 261                 }
 262             }
 263         }
 264         Ok(())
 265     }
 266 }
 267
 268 impl fmt::Display for clean::PathSegment {
 269     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 270         try!(f.write_str(&self.name));
 271         write!(f, "{}", self.params)
 272     }
 273 }
 274
 275 impl fmt::Display for clean::Path {
 276     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 277         if self.global {
 278             try!(f.write_str("::"))
 279         }
 280
 281         for (i, seg) in self.segments.iter().enumerate() {
 282             if i > 0 {
 283                 try!(f.write_str("::"))
 284             }
 285             try!(write!(f, "{}", seg));
 286         }
 287         Ok(())
 288     }
 289 }
 290
 291 pub fn href(did: DefId) -> Option<(String, ItemType, Vec<String>)> {
 292     let cache = cache();
 293     let loc = CURRENT_LOCATION_KEY.with(|l| l.borrow().clone());
 294     let &(ref fqp, shortty) = match cache.paths.get(&did) {
 295         Some(p) => p,
 296         None => return None,
 297     };
 298     let mut url = if did.is_local() || cache.inlined.contains(&did) {
 299         repeat("../").take(loc.len()).collect::<String>()
 300     } else {
 301         match cache.extern_locations[&did.krate] {
 302             (_, render::Remote(ref s)) => s.to_string(),
 303             (_, render::Local) => repeat("../").take(loc.len()).collect(),
 304             (_, render::Unknown) => return None,
 305         }
 306     };
 307     for component in &fqp[..fqp.len() - 1] {
 308         url.push_str(component);
 309         url.push_str("/");
 310     }
 311     match shortty {
 312         ItemType::Module => {
 313             url.push_str(fqp.last().unwrap());
 314             url.push_str("/index.html");
 315         }
 316         _ => {
 317             url.push_str(shortty.to_static_str());
 318             url.push_str(".");
 319             url.push_str(fqp.last().unwrap());
 320             url.push_str(".html");
 321         }
 322     }
 323     Some((url, shortty, fqp.to_vec()))
 324 }
 325
 326 /// Used when rendering a `ResolvedPath` structure. This invokes the `path`
 327 /// rendering function with the necessary arguments for linking to a local path.
 328 fn resolved_path(w: &mut fmt::Formatter, did: DefId, path: &clean::Path,
 329                  print_all: bool) -> fmt::Result {
 330     let last = path.segments.last().unwrap();
 331     let rel_root = match &*path.segments[0].name {
 332         "self" => Some("./".to_string()),
 333         _ => None,
 334     };
 335
 336     if print_all {
 337         let amt = path.segments.len() - 1;
 338         match rel_root {
 339             Some(mut root) => {
 340                 for seg in &path.segments[..amt] {
 341                     if "super" == seg.name || "self" == seg.name {
 342                         try!(write!(w, "{}::", seg.name));
 343                     } else {
 344                         root.push_str(&seg.name);
 345                         root.push_str("/");
 346                         try!(write!(w, "<a class='mod'
 347                                             href='{}index.html'>{}</a>::",
 348                                       root,
 349                                       seg.name));
 350                     }
 351                 }
 352             }
 353             None => {
 354                 for seg in &path.segments[..amt] {
 355                     try!(write!(w, "{}::", seg.name));
 356                 }
 357             }
 358         }
 359     }
 360
 361     match href(did) {
 362         Some((url, shortty, fqp)) => {
 363             try!(write!(w, "<a class='{}' href='{}' title='{}'>{}</a>",
 364                           shortty, url, fqp.join("::"), last.name));
 365         }
 366         _ => try!(write!(w, "{}", last.name)),
 367     }
 368     try!(write!(w, "{}", last.params));
 369     Ok(())
 370 }
 371
 372 fn primitive_link(f: &mut fmt::Formatter,
 373                   prim: clean::PrimitiveType,
 374                   name: &str) -> fmt::Result {
 375     let m = cache();
 376     let mut needs_termination = false;
 377     match m.primitive_locations.get(&prim) {
 378         Some(&LOCAL_CRATE) => {
 379             let len = CURRENT_LOCATION_KEY.with(|s| s.borrow().len());
 380             let len = if len == 0 {0} else {len - 1};
 381             try!(write!(f, "<a href='{}primitive.{}.html'>",
 382                         repeat("../").take(len).collect::<String>(),
 383                         prim.to_url_str()));
 384             needs_termination = true;
 385         }
 386         Some(&cnum) => {
 387             let path = &m.paths[&DefId {
 388                 krate: cnum,
 389                 node: ast::CRATE_NODE_ID,
 390             }];
 391             let loc = match m.extern_locations[&cnum] {
 392                 (_, render::Remote(ref s)) => Some(s.to_string()),
 393                 (_, render::Local) => {
 394                     let len = CURRENT_LOCATION_KEY.with(|s| s.borrow().len());
 395                     Some(repeat("../").take(len).collect::<String>())
 396                 }
 397                 (_, render::Unknown) => None,
 398             };
 399             match loc {
 400                 Some(root) => {
 401                     try!(write!(f, "<a href='{}{}/primitive.{}.html'>",
 402                                 root,
 403                                 path.0.first().unwrap(),
 404                                 prim.to_url_str()));
 405                     needs_termination = true;
 406                 }
 407                 None => {}
 408             }
 409         }
 410         None => {}
 411     }
 412     try!(write!(f, "{}", name));
 413     if needs_termination {
 414         try!(write!(f, "</a>"));
 415     }
 416     Ok(())
 417 }
 418
 419 /// Helper to render type parameters
 420 fn tybounds(w: &mut fmt::Formatter,
 421             typarams: &Option<Vec<clean::TyParamBound> >) -> fmt::Result {
 422     match *typarams {
 423         Some(ref params) => {
 424             for param in params {
 425                 try!(write!(w, " + "));
 426                 try!(write!(w, "{}", *param));
 427             }
 428             Ok(())
 429         }
 430         None => Ok(())
 431     }
 432 }
 433
 434 impl fmt::Display for clean::Type {
 435     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 436         match *self {
 437             clean::Generic(ref name) => {
 438                 f.write_str(name)
 439             }
 440             clean::ResolvedPath{ did, ref typarams, ref path, is_generic } => {
 441                 // Paths like T::Output and Self::Output should be rendered with all segments
 442                 try!(resolved_path(f, did, path, is_generic));
 443                 tybounds(f, typarams)
 444             }
 445             clean::Infer => write!(f, "_"),
 446             clean::Primitive(prim) => primitive_link(f, prim, prim.to_string()),
 447             clean::BareFunction(ref decl) => {
 448                 write!(f, "{}{}fn{}{}",
 449                        UnsafetySpace(decl.unsafety),
 450                        match &*decl.abi {
 451                            "" => " extern ".to_string(),
 452                            "\"Rust\"" => "".to_string(),
 453                            s => format!(" extern {} ", s)
 454                        },
 455                        decl.generics,
 456                        decl.decl)
 457             }
 458             clean::Tuple(ref typs) => {
 459                 primitive_link(f, clean::PrimitiveTuple,
 460                                &*match &**typs {
 461                                     [ref one] => format!("({},)", one),
 462                                     many => format!("({})", CommaSep(&many)),
 463                                })
 464             }
 465             clean::Vector(ref t) => {
 466                 primitive_link(f, clean::Slice, &format!("[{}]", **t))
 467             }
 468             clean::FixedVector(ref t, ref s) => {
 469                 primitive_link(f, clean::PrimitiveType::Array,
 470                                &format!("[{}; {}]", **t, *s))
 471             }
 472             clean::Bottom => f.write_str("!"),
 473             clean::RawPointer(m, ref t) => {
 474                 primitive_link(f, clean::PrimitiveType::PrimitiveRawPointer,
 475                                &format!("*{}{}", RawMutableSpace(m), **t))
 476             }
 477             clean::BorrowedRef{ lifetime: ref l, mutability, type_: ref ty} => {
 478                 let lt = match *l {
 479                     Some(ref l) => format!("{} ", *l),
 480                     _ => "".to_string(),
 481                 };
 482                 let m = MutableSpace(mutability);
 483                 match **ty {
 484                     clean::Vector(ref bt) => { // BorrowedRef{ ... Vector(T) } is &[T]
 485                         match **bt {
 486                             clean::Generic(_) =>
 487                                 primitive_link(f, clean::Slice,
 488                                     &format!("&amp;{}{}[{}]", lt, m, **bt)),
 489                             _ => {
 490                                 try!(primitive_link(f, clean::Slice,
 491                                     &format!("&amp;{}{}[", lt, m)));
 492                                 try!(write!(f, "{}", **bt));
 493                                 primitive_link(f, clean::Slice, "]")
 494                             }
 495                         }
 496                     }
 497                     _ => {
 498                         write!(f, "&amp;{}{}{}", lt, m, **ty)
 499                     }
 500                 }
 501             }
 502             clean::PolyTraitRef(ref bounds) => {
 503                 for (i, bound) in bounds.iter().enumerate() {
 504                     if i != 0 {
 505                         try!(write!(f, " + "));
 506                     }
 507                     try!(write!(f, "{}", *bound));
 508                 }
 509                 Ok(())
 510             }
 511             // It's pretty unsightly to look at `<A as B>::C` in output, and
 512             // we've got hyperlinking on our side, so try to avoid longer
 513             // notation as much as possible by making `C` a hyperlink to trait
 514             // `B` to disambiguate.
 515             //
 516             // FIXME: this is still a lossy conversion and there should probably
 517             //        be a better way of representing this in general? Most of
 518             //        the ugliness comes from inlining across crates where
 519             //        everything comes in as a fully resolved QPath (hard to
 520             //        look at).
 521             clean::QPath {
 522                 ref name,
 523                 ref self_type,
 524                 trait_: box clean::ResolvedPath { did, ref typarams, .. },
 525             } => {
 526                 try!(write!(f, "{}::", self_type));
 527                 let path = clean::Path::singleton(name.clone());
 528                 try!(resolved_path(f, did, &path, false));
 529
 530                 // FIXME: `typarams` are not rendered, and this seems bad?
 531                 drop(typarams);
 532                 Ok(())
 533             }
 534             clean::QPath { ref name, ref self_type, ref trait_ } => {
 535                 write!(f, "&lt;{} as {}&gt;::{}", self_type, trait_, name)
 536             }
 537             clean::Unique(..) => {
 538                 panic!("should have been cleaned")
 539             }
 540         }
 541     }
 542 }
 543
 544 impl fmt::Display for clean::Impl {
 545     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 546         try!(write!(f, "impl{} ", self.generics));
 547         if let Some(ref ty) = self.trait_ {
 548             try!(write!(f, "{}{} for ",
 549                         if self.polarity == Some(clean::ImplPolarity::Negative) { "!" } else { "" },
 550                         *ty));
 551         }
 552         try!(write!(f, "{}{}", self.for_, WhereClause(&self.generics)));
 553         Ok(())
 554     }
 555 }
 556
 557 impl fmt::Display for clean::Arguments {
 558     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 559         for (i, input) in self.values.iter().enumerate() {
 560             if i > 0 { try!(write!(f, ", ")); }
 561             if !input.name.is_empty() {
 562                 try!(write!(f, "{}: ", input.name));
 563             }
 564             try!(write!(f, "{}", input.type_));
 565         }
 566         Ok(())
 567     }
 568 }
 569
 570 impl fmt::Display for clean::FunctionRetTy {
 571     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 572         match *self {
 573             clean::Return(clean::Tuple(ref tys)) if tys.is_empty() => Ok(()),
 574             clean::Return(ref ty) => write!(f, " -&gt; {}", ty),
 575             clean::DefaultReturn => Ok(()),
 576             clean::NoReturn => write!(f, " -&gt; !")
 577         }
 578     }
 579 }
 580
 581 impl fmt::Display for clean::FnDecl {
 582     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 583         if self.variadic {
 584             write!(f, "({args}, ...){arrow}", args = self.inputs, arrow = self.output)
 585         } else {
 586             write!(f, "({args}){arrow}", args = self.inputs, arrow = self.output)
 587         }
 588     }
 589 }
 590
 591 impl<'a> fmt::Display for Method<'a> {
 592     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 593         let Method(selfty, d) = *self;
 594         let mut args = String::new();
 595         match *selfty {
 596             clean::SelfStatic => {},
 597             clean::SelfValue => args.push_str("self"),
 598             clean::SelfBorrowed(Some(ref lt), mtbl) => {
 599                 args.push_str(&format!("&amp;{} {}self", *lt, MutableSpace(mtbl)));
 600             }
 601             clean::SelfBorrowed(None, mtbl) => {
 602                 args.push_str(&format!("&amp;{}self", MutableSpace(mtbl)));
 603             }
 604             clean::SelfExplicit(ref typ) => {
 605                 args.push_str(&format!("self: {}", *typ));
 606             }
 607         }
 608         for (i, input) in d.inputs.values.iter().enumerate() {
 609             if i > 0 || !args.is_empty() { args.push_str(", "); }
 610             if !input.name.is_empty() {
 611                 args.push_str(&format!("{}: ", input.name));
 612             }
 613             args.push_str(&format!("{}", input.type_));
 614         }
 615         write!(f, "({args}){arrow}", args = args, arrow = d.output)
 616     }
 617 }
 618
 619 impl fmt::Display for VisSpace {
 620     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 621         match self.get() {
 622             Some(hir::Public) => write!(f, "pub "),
 623             Some(hir::Inherited) | None => Ok(())
 624         }
 625     }
 626 }
 627
 628 impl fmt::Display for UnsafetySpace {
 629     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 630         match self.get() {
 631             hir::Unsafety::Unsafe => write!(f, "unsafe "),
 632             hir::Unsafety::Normal => Ok(())
 633         }
 634     }
 635 }
 636
 637 impl fmt::Display for ConstnessSpace {
 638     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 639         match self.get() {
 640             hir::Constness::Const => write!(f, "const "),
 641             hir::Constness::NotConst => Ok(())
 642         }
 643     }
 644 }
 645
 646 impl fmt::Display for clean::Import {
 647     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 648         match *self {
 649             clean::SimpleImport(ref name, ref src) => {
 650                 if *name == src.path.segments.last().unwrap().name {
 651                     write!(f, "use {};", *src)
 652                 } else {
 653                     write!(f, "use {} as {};", *src, *name)
 654                 }
 655             }
 656             clean::GlobImport(ref src) => {
 657                 write!(f, "use {}::*;", *src)
 658             }
 659             clean::ImportList(ref src, ref names) => {
 660                 try!(write!(f, "use {}::{{", *src));
 661                 for (i, n) in names.iter().enumerate() {
 662                     if i > 0 {
 663                         try!(write!(f, ", "));
 664                     }
 665                     try!(write!(f, "{}", *n));
 666                 }
 667                 write!(f, "}};")
 668             }
 669         }
 670     }
 671 }
 672
 673 impl fmt::Display for clean::ImportSource {
 674     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 675         match self.did {
 676             Some(did) => resolved_path(f, did, &self.path, true),
 677             _ => {
 678                 for (i, seg) in self.path.segments.iter().enumerate() {
 679                     if i > 0 {
 680                         try!(write!(f, "::"))
 681                     }
 682                     try!(write!(f, "{}", seg.name));
 683                 }
 684                 Ok(())
 685             }
 686         }
 687     }
 688 }
 689
 690 impl fmt::Display for clean::ViewListIdent {
 691     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 692         match self.source {
 693             Some(did) => {
 694                 let path = clean::Path::singleton(self.name.clone());
 695                 try!(resolved_path(f, did, &path, false));
 696             }
 697             _ => try!(write!(f, "{}", self.name)),
 698         }
 699
 700         if let Some(ref name) = self.rename {
 701             try!(write!(f, " as {}", name));
 702         }
 703         Ok(())
 704     }
 705 }
 706
 707 impl fmt::Display for clean::TypeBinding {
 708     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 709         write!(f, "{}={}", self.name, self.ty)
 710     }
 711 }
 712
 713 impl fmt::Display for MutableSpace {
 714     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 715         match *self {
 716             MutableSpace(clean::Immutable) => Ok(()),
 717             MutableSpace(clean::Mutable) => write!(f, "mut "),
 718         }
 719     }
 720 }
 721
 722 impl fmt::Display for RawMutableSpace {
 723     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 724         match *self {
 725             RawMutableSpace(clean::Immutable) => write!(f, "const "),
 726             RawMutableSpace(clean::Mutable) => write!(f, "mut "),
 727         }
 728     }
 729 }
 730
 731 impl fmt::Display for AbiSpace {
 732     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 733         match self.0 {
 734             Abi::Rust => Ok(()),
 735             Abi::C => write!(f, "extern "),
 736             abi => write!(f, "extern {} ", abi),
 737         }
 738     }
 739 }