src/libsyntax/ext/build.rs

   1 // Copyright 2012 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 use abi;
  12 use ast::{Ident, Generics, Expr};
  13 use ast;
  14 use ast_util;
  15 use attr;
  16 use codemap::{Span, respan, Spanned, DUMMY_SP, Pos};
  17 use ext::base::ExtCtxt;
  18 use owned_slice::OwnedSlice;
  19 use parse::token::special_idents;
  20 use parse::token::InternedString;
  21 use parse::token;
  22 use ptr::P;
  23
  24 // Transitional reexports so qquote can find the paths it is looking for
  25 mod syntax {
  26     pub use ext;
  27     pub use parse;
  28 }
  29
  30 pub trait AstBuilder {
  31     // paths
  32     fn path(&self, span: Span, strs: Vec<ast::Ident> ) -> ast::Path;
  33     fn path_ident(&self, span: Span, id: ast::Ident) -> ast::Path;
  34     fn path_global(&self, span: Span, strs: Vec<ast::Ident> ) -> ast::Path;
  35     fn path_all(&self, sp: Span,
  36                 global: bool,
  37                 idents: Vec<ast::Ident> ,
  38                 lifetimes: Vec<ast::Lifetime>,
  39                 types: Vec<P<ast::Ty>>,
  40                 bindings: Vec<P<ast::TypeBinding>> )
  41         -> ast::Path;
  42
  43     fn qpath(&self, self_type: P<ast::Ty>,
  44              trait_path: ast::Path,
  45              ident: ast::Ident)
  46              -> (ast::QSelf, ast::Path);
  47     fn qpath_all(&self, self_type: P<ast::Ty>,
  48                 trait_path: ast::Path,
  49                 ident: ast::Ident,
  50                 lifetimes: Vec<ast::Lifetime>,
  51                 types: Vec<P<ast::Ty>>,
  52                 bindings: Vec<P<ast::TypeBinding>>)
  53                 -> (ast::QSelf, ast::Path);
  54
  55     // types
  56     fn ty_mt(&self, ty: P<ast::Ty>, mutbl: ast::Mutability) -> ast::MutTy;
  57
  58     fn ty(&self, span: Span, ty: ast::Ty_) -> P<ast::Ty>;
  59     fn ty_path(&self, ast::Path) -> P<ast::Ty>;
  60     fn ty_sum(&self, ast::Path, OwnedSlice<ast::TyParamBound>) -> P<ast::Ty>;
  61     fn ty_ident(&self, span: Span, idents: ast::Ident) -> P<ast::Ty>;
  62
  63     fn ty_rptr(&self, span: Span,
  64                ty: P<ast::Ty>,
  65                lifetime: Option<ast::Lifetime>,
  66                mutbl: ast::Mutability) -> P<ast::Ty>;
  67     fn ty_ptr(&self, span: Span,
  68               ty: P<ast::Ty>,
  69               mutbl: ast::Mutability) -> P<ast::Ty>;
  70
  71     fn ty_option(&self, ty: P<ast::Ty>) -> P<ast::Ty>;
  72     fn ty_infer(&self, sp: Span) -> P<ast::Ty>;
  73
  74     fn ty_vars(&self, ty_params: &OwnedSlice<ast::TyParam>) -> Vec<P<ast::Ty>> ;
  75     fn ty_vars_global(&self, ty_params: &OwnedSlice<ast::TyParam>) -> Vec<P<ast::Ty>> ;
  76     fn ty_field_imm(&self, span: Span, name: Ident, ty: P<ast::Ty>) -> ast::TypeField;
  77
  78     fn typaram(&self,
  79                span: Span,
  80                id: ast::Ident,
  81                bounds: OwnedSlice<ast::TyParamBound>,
  82                default: Option<P<ast::Ty>>) -> ast::TyParam;
  83
  84     fn trait_ref(&self, path: ast::Path) -> ast::TraitRef;
  85     fn poly_trait_ref(&self, span: Span, path: ast::Path) -> ast::PolyTraitRef;
  86     fn typarambound(&self, path: ast::Path) -> ast::TyParamBound;
  87     fn lifetime(&self, span: Span, ident: ast::Name) -> ast::Lifetime;
  88     fn lifetime_def(&self,
  89                     span: Span,
  90                     name: ast::Name,
  91                     bounds: Vec<ast::Lifetime>)
  92                     -> ast::LifetimeDef;
  93
  94     // statements
  95     fn stmt_expr(&self, expr: P<ast::Expr>) -> P<ast::Stmt>;
  96     fn stmt_let(&self, sp: Span, mutbl: bool, ident: ast::Ident, ex: P<ast::Expr>) -> P<ast::Stmt>;
  97     fn stmt_let_typed(&self,
  98                       sp: Span,
  99                       mutbl: bool,
 100                       ident: ast::Ident,
 101                       typ: P<ast::Ty>,
 102                       ex: P<ast::Expr>)
 103                       -> P<ast::Stmt>;
 104     fn stmt_item(&self, sp: Span, item: P<ast::Item>) -> P<ast::Stmt>;
 105
 106     // blocks
 107     fn block(&self, span: Span, stmts: Vec<P<ast::Stmt>>,
 108              expr: Option<P<ast::Expr>>) -> P<ast::Block>;
 109     fn block_expr(&self, expr: P<ast::Expr>) -> P<ast::Block>;
 110     fn block_all(&self, span: Span,
 111                  stmts: Vec<P<ast::Stmt>>,
 112                  expr: Option<P<ast::Expr>>) -> P<ast::Block>;
 113
 114     // expressions
 115     fn expr(&self, span: Span, node: ast::Expr_) -> P<ast::Expr>;
 116     fn expr_path(&self, path: ast::Path) -> P<ast::Expr>;
 117     fn expr_qpath(&self, span: Span, qself: ast::QSelf, path: ast::Path) -> P<ast::Expr>;
 118     fn expr_ident(&self, span: Span, id: ast::Ident) -> P<ast::Expr>;
 119
 120     fn expr_self(&self, span: Span) -> P<ast::Expr>;
 121     fn expr_binary(&self, sp: Span, op: ast::BinOp_,
 122                    lhs: P<ast::Expr>, rhs: P<ast::Expr>) -> P<ast::Expr>;
 123     fn expr_deref(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr>;
 124     fn expr_unary(&self, sp: Span, op: ast::UnOp, e: P<ast::Expr>) -> P<ast::Expr>;
 125
 126     fn expr_addr_of(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr>;
 127     fn expr_mut_addr_of(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr>;
 128     fn expr_field_access(&self, span: Span, expr: P<ast::Expr>, ident: ast::Ident) -> P<ast::Expr>;
 129     fn expr_tup_field_access(&self, sp: Span, expr: P<ast::Expr>,
 130                              idx: usize) -> P<ast::Expr>;
 131     fn expr_call(&self, span: Span, expr: P<ast::Expr>, args: Vec<P<ast::Expr>>) -> P<ast::Expr>;
 132     fn expr_call_ident(&self, span: Span, id: ast::Ident, args: Vec<P<ast::Expr>>) -> P<ast::Expr>;
 133     fn expr_call_global(&self, sp: Span, fn_path: Vec<ast::Ident>,
 134                         args: Vec<P<ast::Expr>> ) -> P<ast::Expr>;
 135     fn expr_method_call(&self, span: Span,
 136                         expr: P<ast::Expr>, ident: ast::Ident,
 137                         args: Vec<P<ast::Expr>> ) -> P<ast::Expr>;
 138     fn expr_block(&self, b: P<ast::Block>) -> P<ast::Expr>;
 139     fn expr_cast(&self, sp: Span, expr: P<ast::Expr>, ty: P<ast::Ty>) -> P<ast::Expr>;
 140
 141     fn field_imm(&self, span: Span, name: Ident, e: P<ast::Expr>) -> ast::Field;
 142     fn expr_struct(&self, span: Span, path: ast::Path, fields: Vec<ast::Field>) -> P<ast::Expr>;
 143     fn expr_struct_ident(&self, span: Span, id: ast::Ident,
 144                          fields: Vec<ast::Field>) -> P<ast::Expr>;
 145
 146     fn expr_lit(&self, sp: Span, lit: ast::Lit_) -> P<ast::Expr>;
 147
 148     fn expr_usize(&self, span: Span, i: usize) -> P<ast::Expr>;
 149     fn expr_isize(&self, sp: Span, i: isize) -> P<ast::Expr>;
 150     fn expr_u8(&self, sp: Span, u: u8) -> P<ast::Expr>;
 151     fn expr_u32(&self, sp: Span, u: u32) -> P<ast::Expr>;
 152     fn expr_bool(&self, sp: Span, value: bool) -> P<ast::Expr>;
 153
 154     fn expr_vec(&self, sp: Span, exprs: Vec<P<ast::Expr>>) -> P<ast::Expr>;
 155     fn expr_vec_ng(&self, sp: Span) -> P<ast::Expr>;
 156     fn expr_vec_slice(&self, sp: Span, exprs: Vec<P<ast::Expr>>) -> P<ast::Expr>;
 157     fn expr_str(&self, sp: Span, s: InternedString) -> P<ast::Expr>;
 158
 159     fn expr_some(&self, sp: Span, expr: P<ast::Expr>) -> P<ast::Expr>;
 160     fn expr_none(&self, sp: Span) -> P<ast::Expr>;
 161
 162     fn expr_break(&self, sp: Span) -> P<ast::Expr>;
 163
 164     fn expr_tuple(&self, sp: Span, exprs: Vec<P<ast::Expr>>) -> P<ast::Expr>;
 165
 166     fn expr_fail(&self, span: Span, msg: InternedString) -> P<ast::Expr>;
 167     fn expr_unreachable(&self, span: Span) -> P<ast::Expr>;
 168
 169     fn expr_ok(&self, span: Span, expr: P<ast::Expr>) -> P<ast::Expr>;
 170     fn expr_err(&self, span: Span, expr: P<ast::Expr>) -> P<ast::Expr>;
 171     fn expr_try(&self, span: Span, head: P<ast::Expr>) -> P<ast::Expr>;
 172
 173     fn pat(&self, span: Span, pat: ast::Pat_) -> P<ast::Pat>;
 174     fn pat_wild(&self, span: Span) -> P<ast::Pat>;
 175     fn pat_lit(&self, span: Span, expr: P<ast::Expr>) -> P<ast::Pat>;
 176     fn pat_ident(&self, span: Span, ident: ast::Ident) -> P<ast::Pat>;
 177
 178     fn pat_ident_binding_mode(&self,
 179                               span: Span,
 180                               ident: ast::Ident,
 181                               bm: ast::BindingMode) -> P<ast::Pat>;
 182     fn pat_enum(&self, span: Span, path: ast::Path, subpats: Vec<P<ast::Pat>> ) -> P<ast::Pat>;
 183     fn pat_struct(&self, span: Span,
 184                   path: ast::Path, field_pats: Vec<Spanned<ast::FieldPat>> ) -> P<ast::Pat>;
 185     fn pat_tuple(&self, span: Span, pats: Vec<P<ast::Pat>>) -> P<ast::Pat>;
 186
 187     fn pat_some(&self, span: Span, pat: P<ast::Pat>) -> P<ast::Pat>;
 188     fn pat_none(&self, span: Span) -> P<ast::Pat>;
 189
 190     fn pat_ok(&self, span: Span, pat: P<ast::Pat>) -> P<ast::Pat>;
 191     fn pat_err(&self, span: Span, pat: P<ast::Pat>) -> P<ast::Pat>;
 192
 193     fn arm(&self, span: Span, pats: Vec<P<ast::Pat>>, expr: P<ast::Expr>) -> ast::Arm;
 194     fn arm_unreachable(&self, span: Span) -> ast::Arm;
 195
 196     fn expr_match(&self, span: Span, arg: P<ast::Expr>, arms: Vec<ast::Arm> ) -> P<ast::Expr>;
 197     fn expr_if(&self, span: Span,
 198                cond: P<ast::Expr>, then: P<ast::Expr>, els: Option<P<ast::Expr>>) -> P<ast::Expr>;
 199     fn expr_loop(&self, span: Span, block: P<ast::Block>) -> P<ast::Expr>;
 200
 201     fn lambda_fn_decl(&self, span: Span,
 202                       fn_decl: P<ast::FnDecl>, blk: P<ast::Block>) -> P<ast::Expr>;
 203
 204     fn lambda(&self, span: Span, ids: Vec<ast::Ident> , blk: P<ast::Block>) -> P<ast::Expr>;
 205     fn lambda0(&self, span: Span, blk: P<ast::Block>) -> P<ast::Expr>;
 206     fn lambda1(&self, span: Span, blk: P<ast::Block>, ident: ast::Ident) -> P<ast::Expr>;
 207
 208     fn lambda_expr(&self, span: Span, ids: Vec<ast::Ident> , blk: P<ast::Expr>) -> P<ast::Expr>;
 209     fn lambda_expr_0(&self, span: Span, expr: P<ast::Expr>) -> P<ast::Expr>;
 210     fn lambda_expr_1(&self, span: Span, expr: P<ast::Expr>, ident: ast::Ident) -> P<ast::Expr>;
 211
 212     fn lambda_stmts(&self, span: Span, ids: Vec<ast::Ident>,
 213                     blk: Vec<P<ast::Stmt>>) -> P<ast::Expr>;
 214     fn lambda_stmts_0(&self, span: Span, stmts: Vec<P<ast::Stmt>>) -> P<ast::Expr>;
 215     fn lambda_stmts_1(&self, span: Span, stmts: Vec<P<ast::Stmt>>,
 216                       ident: ast::Ident) -> P<ast::Expr>;
 217
 218     // items
 219     fn item(&self, span: Span,
 220             name: Ident, attrs: Vec<ast::Attribute> , node: ast::Item_) -> P<ast::Item>;
 221
 222     fn arg(&self, span: Span, name: Ident, ty: P<ast::Ty>) -> ast::Arg;
 223     // FIXME unused self
 224     fn fn_decl(&self, inputs: Vec<ast::Arg> , output: P<ast::Ty>) -> P<ast::FnDecl>;
 225
 226     fn item_fn_poly(&self,
 227                     span: Span,
 228                     name: Ident,
 229                     inputs: Vec<ast::Arg> ,
 230                     output: P<ast::Ty>,
 231                     generics: Generics,
 232                     body: P<ast::Block>) -> P<ast::Item>;
 233     fn item_fn(&self,
 234                span: Span,
 235                name: Ident,
 236                inputs: Vec<ast::Arg> ,
 237                output: P<ast::Ty>,
 238                body: P<ast::Block>) -> P<ast::Item>;
 239
 240     fn variant(&self, span: Span, name: Ident, tys: Vec<P<ast::Ty>> ) -> ast::Variant;
 241     fn item_enum_poly(&self,
 242                       span: Span,
 243                       name: Ident,
 244                       enum_definition: ast::EnumDef,
 245                       generics: Generics) -> P<ast::Item>;
 246     fn item_enum(&self, span: Span, name: Ident, enum_def: ast::EnumDef) -> P<ast::Item>;
 247
 248     fn item_struct_poly(&self,
 249                         span: Span,
 250                         name: Ident,
 251                         struct_def: ast::StructDef,
 252                         generics: Generics) -> P<ast::Item>;
 253     fn item_struct(&self, span: Span, name: Ident, struct_def: ast::StructDef) -> P<ast::Item>;
 254
 255     fn item_mod(&self, span: Span, inner_span: Span,
 256                 name: Ident, attrs: Vec<ast::Attribute>,
 257                 items: Vec<P<ast::Item>>) -> P<ast::Item>;
 258
 259     fn item_static(&self,
 260                    span: Span,
 261                    name: Ident,
 262                    ty: P<ast::Ty>,
 263                    mutbl: ast::Mutability,
 264                    expr: P<ast::Expr>)
 265                    -> P<ast::Item>;
 266
 267     fn item_const(&self,
 268                    span: Span,
 269                    name: Ident,
 270                    ty: P<ast::Ty>,
 271                    expr: P<ast::Expr>)
 272                    -> P<ast::Item>;
 273
 274     fn item_ty_poly(&self,
 275                     span: Span,
 276                     name: Ident,
 277                     ty: P<ast::Ty>,
 278                     generics: Generics) -> P<ast::Item>;
 279     fn item_ty(&self, span: Span, name: Ident, ty: P<ast::Ty>) -> P<ast::Item>;
 280
 281     fn attribute(&self, sp: Span, mi: P<ast::MetaItem>) -> ast::Attribute;
 282
 283     fn meta_word(&self, sp: Span, w: InternedString) -> P<ast::MetaItem>;
 284     fn meta_list(&self,
 285                  sp: Span,
 286                  name: InternedString,
 287                  mis: Vec<P<ast::MetaItem>> )
 288                  -> P<ast::MetaItem>;
 289     fn meta_name_value(&self,
 290                        sp: Span,
 291                        name: InternedString,
 292                        value: ast::Lit_)
 293                        -> P<ast::MetaItem>;
 294
 295     fn item_use(&self, sp: Span,
 296                 vis: ast::Visibility, vp: P<ast::ViewPath>) -> P<ast::Item>;
 297     fn item_use_simple(&self, sp: Span, vis: ast::Visibility, path: ast::Path) -> P<ast::Item>;
 298     fn item_use_simple_(&self, sp: Span, vis: ast::Visibility,
 299                         ident: ast::Ident, path: ast::Path) -> P<ast::Item>;
 300     fn item_use_list(&self, sp: Span, vis: ast::Visibility,
 301                      path: Vec<ast::Ident>, imports: &[ast::Ident]) -> P<ast::Item>;
 302     fn item_use_glob(&self, sp: Span,
 303                      vis: ast::Visibility, path: Vec<ast::Ident>) -> P<ast::Item>;
 304 }
 305
 306 impl<'a> AstBuilder for ExtCtxt<'a> {
 307     fn path(&self, span: Span, strs: Vec<ast::Ident> ) -> ast::Path {
 308         self.path_all(span, false, strs, Vec::new(), Vec::new(), Vec::new())
 309     }
 310     fn path_ident(&self, span: Span, id: ast::Ident) -> ast::Path {
 311         self.path(span, vec!(id))
 312     }
 313     fn path_global(&self, span: Span, strs: Vec<ast::Ident> ) -> ast::Path {
 314         self.path_all(span, true, strs, Vec::new(), Vec::new(), Vec::new())
 315     }
 316     fn path_all(&self,
 317                 sp: Span,
 318                 global: bool,
 319                 mut idents: Vec<ast::Ident> ,
 320                 lifetimes: Vec<ast::Lifetime>,
 321                 types: Vec<P<ast::Ty>>,
 322                 bindings: Vec<P<ast::TypeBinding>> )
 323                 -> ast::Path {
 324         let last_identifier = idents.pop().unwrap();
 325         let mut segments: Vec<ast::PathSegment> = idents.into_iter()
 326                                                       .map(|ident| {
 327             ast::PathSegment {
 328                 identifier: ident,
 329                 parameters: ast::PathParameters::none(),
 330             }
 331         }).collect();
 332         segments.push(ast::PathSegment {
 333             identifier: last_identifier,
 334             parameters: ast::AngleBracketedParameters(ast::AngleBracketedParameterData {
 335                 lifetimes: lifetimes,
 336                 types: OwnedSlice::from_vec(types),
 337                 bindings: OwnedSlice::from_vec(bindings),
 338             })
 339         });
 340         ast::Path {
 341             span: sp,
 342             global: global,
 343             segments: segments,
 344         }
 345     }
 346
 347     /// Constructs a qualified path.
 348     ///
 349     /// Constructs a path like `<self_type as trait_path>::ident`.
 350     fn qpath(&self,
 351              self_type: P<ast::Ty>,
 352              trait_path: ast::Path,
 353              ident: ast::Ident)
 354              -> (ast::QSelf, ast::Path) {
 355         self.qpath_all(self_type, trait_path, ident, vec![], vec![], vec![])
 356     }
 357
 358     /// Constructs a qualified path.
 359     ///
 360     /// Constructs a path like `<self_type as trait_path>::ident<'a, T, A=Bar>`.
 361     fn qpath_all(&self,
 362                  self_type: P<ast::Ty>,
 363                  trait_path: ast::Path,
 364                  ident: ast::Ident,
 365                  lifetimes: Vec<ast::Lifetime>,
 366                  types: Vec<P<ast::Ty>>,
 367                  bindings: Vec<P<ast::TypeBinding>>)
 368                  -> (ast::QSelf, ast::Path) {
 369         let mut path = trait_path;
 370         path.segments.push(ast::PathSegment {
 371             identifier: ident,
 372             parameters: ast::AngleBracketedParameters(ast::AngleBracketedParameterData {
 373                 lifetimes: lifetimes,
 374                 types: OwnedSlice::from_vec(types),
 375                 bindings: OwnedSlice::from_vec(bindings),
 376             })
 377         });
 378
 379         (ast::QSelf {
 380             ty: self_type,
 381             position: path.segments.len() - 1
 382         }, path)
 383     }
 384
 385     fn ty_mt(&self, ty: P<ast::Ty>, mutbl: ast::Mutability) -> ast::MutTy {
 386         ast::MutTy {
 387             ty: ty,
 388             mutbl: mutbl
 389         }
 390     }
 391
 392     fn ty(&self, span: Span, ty: ast::Ty_) -> P<ast::Ty> {
 393         P(ast::Ty {
 394             id: ast::DUMMY_NODE_ID,
 395             span: span,
 396             node: ty
 397         })
 398     }
 399
 400     fn ty_path(&self, path: ast::Path) -> P<ast::Ty> {
 401         self.ty(path.span, ast::TyPath(None, path))
 402     }
 403
 404     fn ty_sum(&self, path: ast::Path, bounds: OwnedSlice<ast::TyParamBound>) -> P<ast::Ty> {
 405         self.ty(path.span,
 406                 ast::TyObjectSum(self.ty_path(path),
 407                                  bounds))
 408     }
 409
 410     // Might need to take bounds as an argument in the future, if you ever want
 411     // to generate a bounded existential trait type.
 412     fn ty_ident(&self, span: Span, ident: ast::Ident)
 413         -> P<ast::Ty> {
 414         self.ty_path(self.path_ident(span, ident))
 415     }
 416
 417     fn ty_rptr(&self,
 418                span: Span,
 419                ty: P<ast::Ty>,
 420                lifetime: Option<ast::Lifetime>,
 421                mutbl: ast::Mutability)
 422         -> P<ast::Ty> {
 423         self.ty(span,
 424                 ast::TyRptr(lifetime, self.ty_mt(ty, mutbl)))
 425     }
 426
 427     fn ty_ptr(&self,
 428               span: Span,
 429               ty: P<ast::Ty>,
 430               mutbl: ast::Mutability)
 431         -> P<ast::Ty> {
 432         self.ty(span,
 433                 ast::TyPtr(self.ty_mt(ty, mutbl)))
 434     }
 435
 436     fn ty_option(&self, ty: P<ast::Ty>) -> P<ast::Ty> {
 437         self.ty_path(
 438             self.path_all(DUMMY_SP,
 439                           true,
 440                           vec!(
 441                               self.ident_of_std("core"),
 442                               self.ident_of("option"),
 443                               self.ident_of("Option")
 444                           ),
 445                           Vec::new(),
 446                           vec!( ty ),
 447                           Vec::new()))
 448     }
 449
 450     fn ty_field_imm(&self, span: Span, name: Ident, ty: P<ast::Ty>) -> ast::TypeField {
 451         ast::TypeField {
 452             ident: name,
 453             mt: ast::MutTy { ty: ty, mutbl: ast::MutImmutable },
 454             span: span,
 455         }
 456     }
 457
 458     fn ty_infer(&self, span: Span) -> P<ast::Ty> {
 459         self.ty(span, ast::TyInfer)
 460     }
 461
 462     fn typaram(&self,
 463                span: Span,
 464                id: ast::Ident,
 465                bounds: OwnedSlice<ast::TyParamBound>,
 466                default: Option<P<ast::Ty>>) -> ast::TyParam {
 467         ast::TyParam {
 468             ident: id,
 469             id: ast::DUMMY_NODE_ID,
 470             bounds: bounds,
 471             default: default,
 472             span: span
 473         }
 474     }
 475
 476     // these are strange, and probably shouldn't be used outside of
 477     // pipes. Specifically, the global version possible generates
 478     // incorrect code.
 479     fn ty_vars(&self, ty_params: &OwnedSlice<ast::TyParam>) -> Vec<P<ast::Ty>> {
 480         ty_params.iter().map(|p| self.ty_ident(DUMMY_SP, p.ident)).collect()
 481     }
 482
 483     fn ty_vars_global(&self, ty_params: &OwnedSlice<ast::TyParam>) -> Vec<P<ast::Ty>> {
 484         ty_params
 485             .iter()
 486             .map(|p| self.ty_path(self.path_global(DUMMY_SP, vec!(p.ident))))
 487             .collect()
 488     }
 489
 490     fn trait_ref(&self, path: ast::Path) -> ast::TraitRef {
 491         ast::TraitRef {
 492             path: path,
 493             ref_id: ast::DUMMY_NODE_ID,
 494         }
 495     }
 496
 497     fn poly_trait_ref(&self, span: Span, path: ast::Path) -> ast::PolyTraitRef {
 498         ast::PolyTraitRef {
 499             bound_lifetimes: Vec::new(),
 500             trait_ref: self.trait_ref(path),
 501             span: span,
 502         }
 503     }
 504
 505     fn typarambound(&self, path: ast::Path) -> ast::TyParamBound {
 506         ast::TraitTyParamBound(self.poly_trait_ref(path.span, path), ast::TraitBoundModifier::None)
 507     }
 508
 509     fn lifetime(&self, span: Span, name: ast::Name) -> ast::Lifetime {
 510         ast::Lifetime { id: ast::DUMMY_NODE_ID, span: span, name: name }
 511     }
 512
 513     fn lifetime_def(&self,
 514                     span: Span,
 515                     name: ast::Name,
 516                     bounds: Vec<ast::Lifetime>)
 517                     -> ast::LifetimeDef {
 518         ast::LifetimeDef {
 519             lifetime: self.lifetime(span, name),
 520             bounds: bounds
 521         }
 522     }
 523
 524     fn stmt_expr(&self, expr: P<ast::Expr>) -> P<ast::Stmt> {
 525         P(respan(expr.span, ast::StmtSemi(expr, ast::DUMMY_NODE_ID)))
 526     }
 527
 528     fn stmt_let(&self, sp: Span, mutbl: bool, ident: ast::Ident,
 529                 ex: P<ast::Expr>) -> P<ast::Stmt> {
 530         let pat = if mutbl {
 531             self.pat_ident_binding_mode(sp, ident, ast::BindByValue(ast::MutMutable))
 532         } else {
 533             self.pat_ident(sp, ident)
 534         };
 535         let local = P(ast::Local {
 536             pat: pat,
 537             ty: None,
 538             init: Some(ex),
 539             id: ast::DUMMY_NODE_ID,
 540             span: sp,
 541         });
 542         let decl = respan(sp, ast::DeclLocal(local));
 543         P(respan(sp, ast::StmtDecl(P(decl), ast::DUMMY_NODE_ID)))
 544     }
 545
 546     fn stmt_let_typed(&self,
 547                       sp: Span,
 548                       mutbl: bool,
 549                       ident: ast::Ident,
 550                       typ: P<ast::Ty>,
 551                       ex: P<ast::Expr>)
 552                       -> P<ast::Stmt> {
 553         let pat = if mutbl {
 554             self.pat_ident_binding_mode(sp, ident, ast::BindByValue(ast::MutMutable))
 555         } else {
 556             self.pat_ident(sp, ident)
 557         };
 558         let local = P(ast::Local {
 559             pat: pat,
 560             ty: Some(typ),
 561             init: Some(ex),
 562             id: ast::DUMMY_NODE_ID,
 563             span: sp,
 564         });
 565         let decl = respan(sp, ast::DeclLocal(local));
 566         P(respan(sp, ast::StmtDecl(P(decl), ast::DUMMY_NODE_ID)))
 567     }
 568
 569     fn block(&self, span: Span, stmts: Vec<P<ast::Stmt>>,
 570              expr: Option<P<Expr>>) -> P<ast::Block> {
 571         self.block_all(span, stmts, expr)
 572     }
 573
 574     fn stmt_item(&self, sp: Span, item: P<ast::Item>) -> P<ast::Stmt> {
 575         let decl = respan(sp, ast::DeclItem(item));
 576         P(respan(sp, ast::StmtDecl(P(decl), ast::DUMMY_NODE_ID)))
 577     }
 578
 579     fn block_expr(&self, expr: P<ast::Expr>) -> P<ast::Block> {
 580         self.block_all(expr.span, Vec::new(), Some(expr))
 581     }
 582     fn block_all(&self,
 583                  span: Span,
 584                  stmts: Vec<P<ast::Stmt>>,
 585                  expr: Option<P<ast::Expr>>) -> P<ast::Block> {
 586             P(ast::Block {
 587                stmts: stmts,
 588                expr: expr,
 589                id: ast::DUMMY_NODE_ID,
 590                rules: ast::DefaultBlock,
 591                span: span,
 592             })
 593     }
 594
 595     fn expr(&self, span: Span, node: ast::Expr_) -> P<ast::Expr> {
 596         P(ast::Expr {
 597             id: ast::DUMMY_NODE_ID,
 598             node: node,
 599             span: span,
 600         })
 601     }
 602
 603     fn expr_path(&self, path: ast::Path) -> P<ast::Expr> {
 604         self.expr(path.span, ast::ExprPath(None, path))
 605     }
 606
 607     /// Constructs a QPath expression.
 608     fn expr_qpath(&self, span: Span, qself: ast::QSelf, path: ast::Path) -> P<ast::Expr> {
 609         self.expr(span, ast::ExprPath(Some(qself), path))
 610     }
 611
 612     fn expr_ident(&self, span: Span, id: ast::Ident) -> P<ast::Expr> {
 613         self.expr_path(self.path_ident(span, id))
 614     }
 615     fn expr_self(&self, span: Span) -> P<ast::Expr> {
 616         self.expr_ident(span, special_idents::self_)
 617     }
 618
 619     fn expr_binary(&self, sp: Span, op: ast::BinOp_,
 620                    lhs: P<ast::Expr>, rhs: P<ast::Expr>) -> P<ast::Expr> {
 621         self.expr(sp, ast::ExprBinary(Spanned { node: op, span: sp }, lhs, rhs))
 622     }
 623
 624     fn expr_deref(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr> {
 625         self.expr_unary(sp, ast::UnDeref, e)
 626     }
 627     fn expr_unary(&self, sp: Span, op: ast::UnOp, e: P<ast::Expr>) -> P<ast::Expr> {
 628         self.expr(sp, ast::ExprUnary(op, e))
 629     }
 630
 631     fn expr_field_access(&self, sp: Span, expr: P<ast::Expr>, ident: ast::Ident) -> P<ast::Expr> {
 632         let field_span = Span {
 633             lo: sp.lo - Pos::from_usize(ident.name.as_str().len()),
 634             hi: sp.hi,
 635             expn_id: sp.expn_id,
 636         };
 637
 638         let id = Spanned { node: ident, span: field_span };
 639         self.expr(sp, ast::ExprField(expr, id))
 640     }
 641     fn expr_tup_field_access(&self, sp: Span, expr: P<ast::Expr>, idx: usize) -> P<ast::Expr> {
 642         let field_span = Span {
 643             lo: sp.lo - Pos::from_usize(idx.to_string().len()),
 644             hi: sp.hi,
 645             expn_id: sp.expn_id,
 646         };
 647
 648         let id = Spanned { node: idx, span: field_span };
 649         self.expr(sp, ast::ExprTupField(expr, id))
 650     }
 651     fn expr_addr_of(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr> {
 652         self.expr(sp, ast::ExprAddrOf(ast::MutImmutable, e))
 653     }
 654     fn expr_mut_addr_of(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr> {
 655         self.expr(sp, ast::ExprAddrOf(ast::MutMutable, e))
 656     }
 657
 658     fn expr_call(&self, span: Span, expr: P<ast::Expr>, args: Vec<P<ast::Expr>>) -> P<ast::Expr> {
 659         self.expr(span, ast::ExprCall(expr, args))
 660     }
 661     fn expr_call_ident(&self, span: Span, id: ast::Ident,
 662                        args: Vec<P<ast::Expr>>) -> P<ast::Expr> {
 663         self.expr(span, ast::ExprCall(self.expr_ident(span, id), args))
 664     }
 665     fn expr_call_global(&self, sp: Span, fn_path: Vec<ast::Ident> ,
 666                       args: Vec<P<ast::Expr>> ) -> P<ast::Expr> {
 667         let pathexpr = self.expr_path(self.path_global(sp, fn_path));
 668         self.expr_call(sp, pathexpr, args)
 669     }
 670     fn expr_method_call(&self, span: Span,
 671                         expr: P<ast::Expr>,
 672                         ident: ast::Ident,
 673                         mut args: Vec<P<ast::Expr>> ) -> P<ast::Expr> {
 674         let id = Spanned { node: ident, span: span };
 675         args.insert(0, expr);
 676         self.expr(span, ast::ExprMethodCall(id, Vec::new(), args))
 677     }
 678     fn expr_block(&self, b: P<ast::Block>) -> P<ast::Expr> {
 679         self.expr(b.span, ast::ExprBlock(b))
 680     }
 681     fn field_imm(&self, span: Span, name: Ident, e: P<ast::Expr>) -> ast::Field {
 682         ast::Field { ident: respan(span, name), expr: e, span: span }
 683     }
 684     fn expr_struct(&self, span: Span, path: ast::Path, fields: Vec<ast::Field>) -> P<ast::Expr> {
 685         self.expr(span, ast::ExprStruct(path, fields, None))
 686     }
 687     fn expr_struct_ident(&self, span: Span,
 688                          id: ast::Ident, fields: Vec<ast::Field>) -> P<ast::Expr> {
 689         self.expr_struct(span, self.path_ident(span, id), fields)
 690     }
 691
 692     fn expr_lit(&self, sp: Span, lit: ast::Lit_) -> P<ast::Expr> {
 693         self.expr(sp, ast::ExprLit(P(respan(sp, lit))))
 694     }
 695     fn expr_usize(&self, span: Span, i: usize) -> P<ast::Expr> {
 696         self.expr_lit(span, ast::LitInt(i as u64, ast::UnsignedIntLit(ast::TyUs)))
 697     }
 698     fn expr_isize(&self, sp: Span, i: isize) -> P<ast::Expr> {
 699         self.expr_lit(sp, ast::LitInt(i as u64, ast::SignedIntLit(ast::TyIs,
 700                                                                   ast::Sign::new(i))))
 701     }
 702     fn expr_u32(&self, sp: Span, u: u32) -> P<ast::Expr> {
 703         self.expr_lit(sp, ast::LitInt(u as u64, ast::UnsignedIntLit(ast::TyU32)))
 704     }
 705     fn expr_u8(&self, sp: Span, u: u8) -> P<ast::Expr> {
 706         self.expr_lit(sp, ast::LitInt(u as u64, ast::UnsignedIntLit(ast::TyU8)))
 707     }
 708     fn expr_bool(&self, sp: Span, value: bool) -> P<ast::Expr> {
 709         self.expr_lit(sp, ast::LitBool(value))
 710     }
 711
 712     fn expr_vec(&self, sp: Span, exprs: Vec<P<ast::Expr>>) -> P<ast::Expr> {
 713         self.expr(sp, ast::ExprVec(exprs))
 714     }
 715     fn expr_vec_ng(&self, sp: Span) -> P<ast::Expr> {
 716         self.expr_call_global(sp,
 717                               vec!(self.ident_of_std("collections"),
 718                                    self.ident_of("vec"),
 719                                    self.ident_of("Vec"),
 720                                    self.ident_of("new")),
 721                               Vec::new())
 722     }
 723     fn expr_vec_slice(&self, sp: Span, exprs: Vec<P<ast::Expr>>) -> P<ast::Expr> {
 724         self.expr_addr_of(sp, self.expr_vec(sp, exprs))
 725     }
 726     fn expr_str(&self, sp: Span, s: InternedString) -> P<ast::Expr> {
 727         self.expr_lit(sp, ast::LitStr(s, ast::CookedStr))
 728     }
 729
 730     fn expr_cast(&self, sp: Span, expr: P<ast::Expr>, ty: P<ast::Ty>) -> P<ast::Expr> {
 731         self.expr(sp, ast::ExprCast(expr, ty))
 732     }
 733
 734
 735     fn expr_some(&self, sp: Span, expr: P<ast::Expr>) -> P<ast::Expr> {
 736         let some = vec!(
 737             self.ident_of_std("core"),
 738             self.ident_of("option"),
 739             self.ident_of("Option"),
 740             self.ident_of("Some"));
 741         self.expr_call_global(sp, some, vec!(expr))
 742     }
 743
 744     fn expr_none(&self, sp: Span) -> P<ast::Expr> {
 745         let none = self.path_global(sp, vec!(
 746             self.ident_of_std("core"),
 747             self.ident_of("option"),
 748             self.ident_of("Option"),
 749             self.ident_of("None")));
 750         self.expr_path(none)
 751     }
 752
 753
 754     fn expr_break(&self, sp: Span) -> P<ast::Expr> {
 755         self.expr(sp, ast::ExprBreak(None))
 756     }
 757
 758
 759     fn expr_tuple(&self, sp: Span, exprs: Vec<P<ast::Expr>>) -> P<ast::Expr> {
 760         self.expr(sp, ast::ExprTup(exprs))
 761     }
 762
 763     fn expr_fail(&self, span: Span, msg: InternedString) -> P<ast::Expr> {
 764         let loc = self.codemap().lookup_char_pos(span.lo);
 765         let expr_file = self.expr_str(span,
 766                                       token::intern_and_get_ident(&loc.file.name));
 767         let expr_line = self.expr_u32(span, loc.line as u32);
 768         let expr_file_line_tuple = self.expr_tuple(span, vec!(expr_file, expr_line));
 769         let expr_file_line_ptr = self.expr_addr_of(span, expr_file_line_tuple);
 770         self.expr_call_global(
 771             span,
 772             vec!(
 773                 self.ident_of_std("core"),
 774                 self.ident_of("rt"),
 775                 self.ident_of("begin_unwind")),
 776             vec!(
 777                 self.expr_str(span, msg),
 778                 expr_file_line_ptr))
 779     }
 780
 781     fn expr_unreachable(&self, span: Span) -> P<ast::Expr> {
 782         self.expr_fail(span,
 783                        InternedString::new(
 784                            "internal error: entered unreachable code"))
 785     }
 786
 787     fn expr_ok(&self, sp: Span, expr: P<ast::Expr>) -> P<ast::Expr> {
 788         let ok = vec!(
 789             self.ident_of_std("core"),
 790             self.ident_of("result"),
 791             self.ident_of("Result"),
 792             self.ident_of("Ok"));
 793         self.expr_call_global(sp, ok, vec!(expr))
 794     }
 795
 796     fn expr_err(&self, sp: Span, expr: P<ast::Expr>) -> P<ast::Expr> {
 797         let err = vec!(
 798             self.ident_of_std("core"),
 799             self.ident_of("result"),
 800             self.ident_of("Result"),
 801             self.ident_of("Err"));
 802         self.expr_call_global(sp, err, vec!(expr))
 803     }
 804
 805     fn expr_try(&self, sp: Span, head: P<ast::Expr>) -> P<ast::Expr> {
 806         let ok = vec![
 807             self.ident_of_std("core"),
 808             self.ident_of("result"),
 809             self.ident_of("Result"),
 810             self.ident_of("Ok")
 811         ];
 812         let ok_path = self.path_global(sp, ok);
 813         let err = vec![
 814             self.ident_of_std("core"),
 815             self.ident_of("result"),
 816             self.ident_of("Result"),
 817             self.ident_of("Err")
 818         ];
 819         let err_path = self.path_global(sp, err);
 820
 821         let binding_variable = self.ident_of("__try_var");
 822         let binding_pat = self.pat_ident(sp, binding_variable);
 823         let binding_expr = self.expr_ident(sp, binding_variable);
 824
 825         // Ok(__try_var) pattern
 826         let ok_pat = self.pat_enum(sp, ok_path, vec!(binding_pat.clone()));
 827
 828         // Err(__try_var)  (pattern and expression resp.)
 829         let err_pat = self.pat_enum(sp, err_path.clone(), vec!(binding_pat));
 830         let err_inner_expr = self.expr_call(sp, self.expr_path(err_path),
 831                                             vec!(binding_expr.clone()));
 832         // return Err(__try_var)
 833         let err_expr = self.expr(sp, ast::ExprRet(Some(err_inner_expr)));
 834
 835         // Ok(__try_var) => __try_var
 836         let ok_arm = self.arm(sp, vec!(ok_pat), binding_expr);
 837         // Err(__try_var) => return Err(__try_var)
 838         let err_arm = self.arm(sp, vec!(err_pat), err_expr);
 839
 840         // match head { Ok() => ..., Err() => ... }
 841         self.expr_match(sp, head, vec!(ok_arm, err_arm))
 842     }
 843
 844
 845     fn pat(&self, span: Span, pat: ast::Pat_) -> P<ast::Pat> {
 846         P(ast::Pat { id: ast::DUMMY_NODE_ID, node: pat, span: span })
 847     }
 848     fn pat_wild(&self, span: Span) -> P<ast::Pat> {
 849         self.pat(span, ast::PatWild(ast::PatWildSingle))
 850     }
 851     fn pat_lit(&self, span: Span, expr: P<ast::Expr>) -> P<ast::Pat> {
 852         self.pat(span, ast::PatLit(expr))
 853     }
 854     fn pat_ident(&self, span: Span, ident: ast::Ident) -> P<ast::Pat> {
 855         self.pat_ident_binding_mode(span, ident, ast::BindByValue(ast::MutImmutable))
 856     }
 857
 858     fn pat_ident_binding_mode(&self,
 859                               span: Span,
 860                               ident: ast::Ident,
 861                               bm: ast::BindingMode) -> P<ast::Pat> {
 862         let pat = ast::PatIdent(bm, Spanned{span: span, node: ident}, None);
 863         self.pat(span, pat)
 864     }
 865     fn pat_enum(&self, span: Span, path: ast::Path, subpats: Vec<P<ast::Pat>>) -> P<ast::Pat> {
 866         let pat = ast::PatEnum(path, Some(subpats));
 867         self.pat(span, pat)
 868     }
 869     fn pat_struct(&self, span: Span,
 870                   path: ast::Path, field_pats: Vec<Spanned<ast::FieldPat>>) -> P<ast::Pat> {
 871         let pat = ast::PatStruct(path, field_pats, false);
 872         self.pat(span, pat)
 873     }
 874     fn pat_tuple(&self, span: Span, pats: Vec<P<ast::Pat>>) -> P<ast::Pat> {
 875         self.pat(span, ast::PatTup(pats))
 876     }
 877
 878     fn pat_some(&self, span: Span, pat: P<ast::Pat>) -> P<ast::Pat> {
 879         let some = vec!(
 880             self.ident_of_std("core"),
 881             self.ident_of("option"),
 882             self.ident_of("Option"),
 883             self.ident_of("Some"));
 884         let path = self.path_global(span, some);
 885         self.pat_enum(span, path, vec!(pat))
 886     }
 887
 888     fn pat_none(&self, span: Span) -> P<ast::Pat> {
 889         let some = vec!(
 890             self.ident_of_std("core"),
 891             self.ident_of("option"),
 892             self.ident_of("Option"),
 893             self.ident_of("None"));
 894         let path = self.path_global(span, some);
 895         self.pat_enum(span, path, vec!())
 896     }
 897
 898     fn pat_ok(&self, span: Span, pat: P<ast::Pat>) -> P<ast::Pat> {
 899         let some = vec!(
 900             self.ident_of_std("core"),
 901             self.ident_of("result"),
 902             self.ident_of("Result"),
 903             self.ident_of("Ok"));
 904         let path = self.path_global(span, some);
 905         self.pat_enum(span, path, vec!(pat))
 906     }
 907
 908     fn pat_err(&self, span: Span, pat: P<ast::Pat>) -> P<ast::Pat> {
 909         let some = vec!(
 910             self.ident_of_std("core"),
 911             self.ident_of("result"),
 912             self.ident_of("Result"),
 913             self.ident_of("Err"));
 914         let path = self.path_global(span, some);
 915         self.pat_enum(span, path, vec!(pat))
 916     }
 917
 918     fn arm(&self, _span: Span, pats: Vec<P<ast::Pat>>, expr: P<ast::Expr>) -> ast::Arm {
 919         ast::Arm {
 920             attrs: vec!(),
 921             pats: pats,
 922             guard: None,
 923             body: expr
 924         }
 925     }
 926
 927     fn arm_unreachable(&self, span: Span) -> ast::Arm {
 928         self.arm(span, vec!(self.pat_wild(span)), self.expr_unreachable(span))
 929     }
 930
 931     fn expr_match(&self, span: Span, arg: P<ast::Expr>, arms: Vec<ast::Arm>) -> P<Expr> {
 932         self.expr(span, ast::ExprMatch(arg, arms, ast::MatchSource::Normal))
 933     }
 934
 935     fn expr_if(&self, span: Span, cond: P<ast::Expr>,
 936                then: P<ast::Expr>, els: Option<P<ast::Expr>>) -> P<ast::Expr> {
 937         let els = els.map(|x| self.expr_block(self.block_expr(x)));
 938         self.expr(span, ast::ExprIf(cond, self.block_expr(then), els))
 939     }
 940
 941     fn expr_loop(&self, span: Span, block: P<ast::Block>) -> P<ast::Expr> {
 942         self.expr(span, ast::ExprLoop(block, None))
 943     }
 944
 945     fn lambda_fn_decl(&self, span: Span,
 946                       fn_decl: P<ast::FnDecl>, blk: P<ast::Block>) -> P<ast::Expr> {
 947         self.expr(span, ast::ExprClosure(ast::CaptureByRef, fn_decl, blk))
 948     }
 949     fn lambda(&self, span: Span, ids: Vec<ast::Ident>, blk: P<ast::Block>) -> P<ast::Expr> {
 950         let fn_decl = self.fn_decl(
 951             ids.iter().map(|id| self.arg(span, *id, self.ty_infer(span))).collect(),
 952             self.ty_infer(span));
 953
 954         self.expr(span, ast::ExprClosure(ast::CaptureByRef, fn_decl, blk))
 955     }
 956     fn lambda0(&self, span: Span, blk: P<ast::Block>) -> P<ast::Expr> {
 957         self.lambda(span, Vec::new(), blk)
 958     }
 959
 960     fn lambda1(&self, span: Span, blk: P<ast::Block>, ident: ast::Ident) -> P<ast::Expr> {
 961         self.lambda(span, vec!(ident), blk)
 962     }
 963
 964     fn lambda_expr(&self, span: Span, ids: Vec<ast::Ident>,
 965                    expr: P<ast::Expr>) -> P<ast::Expr> {
 966         self.lambda(span, ids, self.block_expr(expr))
 967     }
 968     fn lambda_expr_0(&self, span: Span, expr: P<ast::Expr>) -> P<ast::Expr> {
 969         self.lambda0(span, self.block_expr(expr))
 970     }
 971     fn lambda_expr_1(&self, span: Span, expr: P<ast::Expr>, ident: ast::Ident) -> P<ast::Expr> {
 972         self.lambda1(span, self.block_expr(expr), ident)
 973     }
 974
 975     fn lambda_stmts(&self,
 976                     span: Span,
 977                     ids: Vec<ast::Ident>,
 978                     stmts: Vec<P<ast::Stmt>>)
 979                     -> P<ast::Expr> {
 980         self.lambda(span, ids, self.block(span, stmts, None))
 981     }
 982     fn lambda_stmts_0(&self, span: Span, stmts: Vec<P<ast::Stmt>>) -> P<ast::Expr> {
 983         self.lambda0(span, self.block(span, stmts, None))
 984     }
 985     fn lambda_stmts_1(&self, span: Span, stmts: Vec<P<ast::Stmt>>,
 986                       ident: ast::Ident) -> P<ast::Expr> {
 987         self.lambda1(span, self.block(span, stmts, None), ident)
 988     }
 989
 990     fn arg(&self, span: Span, ident: ast::Ident, ty: P<ast::Ty>) -> ast::Arg {
 991         let arg_pat = self.pat_ident(span, ident);
 992         ast::Arg {
 993             ty: ty,
 994             pat: arg_pat,
 995             id: ast::DUMMY_NODE_ID
 996         }
 997     }
 998
 999     // FIXME unused self
1000     fn fn_decl(&self, inputs: Vec<ast::Arg>, output: P<ast::Ty>) -> P<ast::FnDecl> {
1001         P(ast::FnDecl {
1002             inputs: inputs,
1003             output: ast::Return(output),
1004             variadic: false
1005         })
1006     }
1007
1008     fn item(&self, span: Span, name: Ident,
1009             attrs: Vec<ast::Attribute>, node: ast::Item_) -> P<ast::Item> {
1010         // FIXME: Would be nice if our generated code didn't violate
1011         // Rust coding conventions
1012         P(ast::Item {
1013             ident: name,
1014             attrs: attrs,
1015             id: ast::DUMMY_NODE_ID,
1016             node: node,
1017             vis: ast::Inherited,
1018             span: span
1019         })
1020     }
1021
1022     fn item_fn_poly(&self,
1023                     span: Span,
1024                     name: Ident,
1025                     inputs: Vec<ast::Arg> ,
1026                     output: P<ast::Ty>,
1027                     generics: Generics,
1028                     body: P<ast::Block>) -> P<ast::Item> {
1029         self.item(span,
1030                   name,
1031                   Vec::new(),
1032                   ast::ItemFn(self.fn_decl(inputs, output),
1033                               ast::Unsafety::Normal,
1034                               ast::Constness::NotConst,
1035                               abi::Rust,
1036                               generics,
1037                               body))
1038     }
1039
1040     fn item_fn(&self,
1041                span: Span,
1042                name: Ident,
1043                inputs: Vec<ast::Arg> ,
1044                output: P<ast::Ty>,
1045                body: P<ast::Block>
1046               ) -> P<ast::Item> {
1047         self.item_fn_poly(
1048             span,
1049             name,
1050             inputs,
1051             output,
1052             ast_util::empty_generics(),
1053             body)
1054     }
1055
1056     fn variant(&self, span: Span, name: Ident, tys: Vec<P<ast::Ty>> ) -> ast::Variant {
1057         let args = tys.into_iter().map(|ty| {
1058             ast::VariantArg { ty: ty, id: ast::DUMMY_NODE_ID }
1059         }).collect();
1060
1061         respan(span,
1062                ast::Variant_ {
1063                    name: name,
1064                    attrs: Vec::new(),
1065                    kind: ast::TupleVariantKind(args),
1066                    id: ast::DUMMY_NODE_ID,
1067                    disr_expr: None,
1068                    vis: ast::Public
1069                })
1070     }
1071
1072     fn item_enum_poly(&self, span: Span, name: Ident,
1073                       enum_definition: ast::EnumDef,
1074                       generics: Generics) -> P<ast::Item> {
1075         self.item(span, name, Vec::new(), ast::ItemEnum(enum_definition, generics))
1076     }
1077
1078     fn item_enum(&self, span: Span, name: Ident,
1079                  enum_definition: ast::EnumDef) -> P<ast::Item> {
1080         self.item_enum_poly(span, name, enum_definition,
1081                             ast_util::empty_generics())
1082     }
1083
1084     fn item_struct(&self, span: Span, name: Ident,
1085                    struct_def: ast::StructDef) -> P<ast::Item> {
1086         self.item_struct_poly(
1087             span,
1088             name,
1089             struct_def,
1090             ast_util::empty_generics()
1091         )
1092     }
1093
1094     fn item_struct_poly(&self, span: Span, name: Ident,
1095         struct_def: ast::StructDef, generics: Generics) -> P<ast::Item> {
1096         self.item(span, name, Vec::new(), ast::ItemStruct(P(struct_def), generics))
1097     }
1098
1099     fn item_mod(&self, span: Span, inner_span: Span, name: Ident,
1100                 attrs: Vec<ast::Attribute>,
1101                 items: Vec<P<ast::Item>>) -> P<ast::Item> {
1102         self.item(
1103             span,
1104             name,
1105             attrs,
1106             ast::ItemMod(ast::Mod {
1107                 inner: inner_span,
1108                 items: items,
1109             })
1110         )
1111     }
1112
1113     fn item_static(&self,
1114                    span: Span,
1115                    name: Ident,
1116                    ty: P<ast::Ty>,
1117                    mutbl: ast::Mutability,
1118                    expr: P<ast::Expr>)
1119                    -> P<ast::Item> {
1120         self.item(span, name, Vec::new(), ast::ItemStatic(ty, mutbl, expr))
1121     }
1122
1123     fn item_const(&self,
1124                   span: Span,
1125                   name: Ident,
1126                   ty: P<ast::Ty>,
1127                   expr: P<ast::Expr>)
1128                   -> P<ast::Item> {
1129         self.item(span, name, Vec::new(), ast::ItemConst(ty, expr))
1130     }
1131
1132     fn item_ty_poly(&self, span: Span, name: Ident, ty: P<ast::Ty>,
1133                     generics: Generics) -> P<ast::Item> {
1134         self.item(span, name, Vec::new(), ast::ItemTy(ty, generics))
1135     }
1136
1137     fn item_ty(&self, span: Span, name: Ident, ty: P<ast::Ty>) -> P<ast::Item> {
1138         self.item_ty_poly(span, name, ty, ast_util::empty_generics())
1139     }
1140
1141     fn attribute(&self, sp: Span, mi: P<ast::MetaItem>) -> ast::Attribute {
1142         respan(sp, ast::Attribute_ {
1143             id: attr::mk_attr_id(),
1144             style: ast::AttrOuter,
1145             value: mi,
1146             is_sugared_doc: false,
1147         })
1148     }
1149
1150     fn meta_word(&self, sp: Span, w: InternedString) -> P<ast::MetaItem> {
1151         P(respan(sp, ast::MetaWord(w)))
1152     }
1153     fn meta_list(&self,
1154                  sp: Span,
1155                  name: InternedString,
1156                  mis: Vec<P<ast::MetaItem>> )
1157                  -> P<ast::MetaItem> {
1158         P(respan(sp, ast::MetaList(name, mis)))
1159     }
1160     fn meta_name_value(&self,
1161                        sp: Span,
1162                        name: InternedString,
1163                        value: ast::Lit_)
1164                        -> P<ast::MetaItem> {
1165         P(respan(sp, ast::MetaNameValue(name, respan(sp, value))))
1166     }
1167
1168     fn item_use(&self, sp: Span,
1169                 vis: ast::Visibility, vp: P<ast::ViewPath>) -> P<ast::Item> {
1170         P(ast::Item {
1171             id: ast::DUMMY_NODE_ID,
1172             ident: special_idents::invalid,
1173             attrs: vec![],
1174             node: ast::ItemUse(vp),
1175             vis: vis,
1176             span: sp
1177         })
1178     }
1179
1180     fn item_use_simple(&self, sp: Span, vis: ast::Visibility, path: ast::Path) -> P<ast::Item> {
1181         let last = path.segments.last().unwrap().identifier;
1182         self.item_use_simple_(sp, vis, last, path)
1183     }
1184
1185     fn item_use_simple_(&self, sp: Span, vis: ast::Visibility,
1186                         ident: ast::Ident, path: ast::Path) -> P<ast::Item> {
1187         self.item_use(sp, vis,
1188                       P(respan(sp,
1189                                ast::ViewPathSimple(ident,
1190                                                    path))))
1191     }
1192
1193     fn item_use_list(&self, sp: Span, vis: ast::Visibility,
1194                      path: Vec<ast::Ident>, imports: &[ast::Ident]) -> P<ast::Item> {
1195         let imports = imports.iter().map(|id| {
1196             respan(sp, ast::PathListIdent { name: *id, id: ast::DUMMY_NODE_ID })
1197         }).collect();
1198
1199         self.item_use(sp, vis,
1200                       P(respan(sp,
1201                                ast::ViewPathList(self.path(sp, path),
1202                                                  imports))))
1203     }
1204
1205     fn item_use_glob(&self, sp: Span,
1206                      vis: ast::Visibility, path: Vec<ast::Ident>) -> P<ast::Item> {
1207         self.item_use(sp, vis,
1208                       P(respan(sp,
1209                                ast::ViewPathGlob(self.path(sp, path)))))
1210     }
1211 }