// Copyright 2015 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 or the MIT license // , at your // option. This file may not be copied, modified, or distributed // except according to those terms. pub use self::AnnNode::*; use syntax::abi; use syntax::ast; use syntax::codemap::{self, CodeMap, BytePos, Spanned}; use syntax::errors; use syntax::parse::token::{self, BinOpToken}; use syntax::parse::lexer::comments; use syntax::parse; use syntax::print::pp::{self, break_offset, word, space, hardbreak}; use syntax::print::pp::{Breaks, eof}; use syntax::print::pp::Breaks::{Consistent, Inconsistent}; use syntax::print::pprust::{self as ast_pp, PrintState}; use syntax::ptr::P; use hir; use hir::{Crate, RegionTyParamBound, TraitTyParamBound, TraitBoundModifier}; use std::io::{self, Write, Read}; pub enum AnnNode<'a> { NodeName(&'a ast::Name), NodeBlock(&'a hir::Block), NodeItem(&'a hir::Item), NodeSubItem(ast::NodeId), NodeExpr(&'a hir::Expr), NodePat(&'a hir::Pat), } pub trait PpAnn { fn pre(&self, _state: &mut State, _node: AnnNode) -> io::Result<()> { Ok(()) } fn post(&self, _state: &mut State, _node: AnnNode) -> io::Result<()> { Ok(()) } } #[derive(Copy, Clone)] pub struct NoAnn; impl PpAnn for NoAnn {} pub struct State<'a> { krate: Option<&'a Crate>, pub s: pp::Printer<'a>, cm: Option<&'a CodeMap>, comments: Option>, literals: Option>, cur_cmnt_and_lit: ast_pp::CurrentCommentAndLiteral, boxes: Vec, ann: &'a (PpAnn + 'a), } impl<'a> PrintState<'a> for State<'a> { fn writer(&mut self) -> &mut pp::Printer<'a> { &mut self.s } fn boxes(&mut self) -> &mut Vec { &mut self.boxes } fn comments(&mut self) -> &mut Option> { &mut self.comments } fn cur_cmnt_and_lit(&mut self) -> &mut ast_pp::CurrentCommentAndLiteral { &mut self.cur_cmnt_and_lit } fn literals(&self) -> &Option> { &self.literals } } pub fn rust_printer<'a>(writer: Box, krate: Option<&'a Crate>) -> State<'a> { static NO_ANN: NoAnn = NoAnn; rust_printer_annotated(writer, &NO_ANN, krate) } pub fn rust_printer_annotated<'a>(writer: Box, ann: &'a PpAnn, krate: Option<&'a Crate>) -> State<'a> { State { krate: krate, s: pp::mk_printer(writer, default_columns), cm: None, comments: None, literals: None, cur_cmnt_and_lit: ast_pp::CurrentCommentAndLiteral { cur_cmnt: 0, cur_lit: 0, }, boxes: Vec::new(), ann: ann, } } #[allow(non_upper_case_globals)] pub const indent_unit: usize = 4; #[allow(non_upper_case_globals)] pub const default_columns: usize = 78; /// Requires you to pass an input filename and reader so that /// it can scan the input text for comments and literals to /// copy forward. pub fn print_crate<'a>(cm: &'a CodeMap, span_diagnostic: &errors::Handler, krate: &hir::Crate, filename: String, input: &mut Read, out: Box, ann: &'a PpAnn, is_expanded: bool) -> io::Result<()> { let mut s = State::new_from_input(cm, span_diagnostic, filename, input, out, ann, is_expanded, Some(krate)); // When printing the AST, we sometimes need to inject `#[no_std]` here. // Since you can't compile the HIR, it's not necessary. try!(s.print_mod(&krate.module, &krate.attrs)); try!(s.print_remaining_comments()); eof(&mut s.s) } impl<'a> State<'a> { pub fn new_from_input(cm: &'a CodeMap, span_diagnostic: &errors::Handler, filename: String, input: &mut Read, out: Box, ann: &'a PpAnn, is_expanded: bool, krate: Option<&'a Crate>) -> State<'a> { let (cmnts, lits) = comments::gather_comments_and_literals(span_diagnostic, filename, input); State::new(cm, out, ann, Some(cmnts), // If the code is post expansion, don't use the table of // literals, since it doesn't correspond with the literals // in the AST anymore. if is_expanded { None } else { Some(lits) }, krate) } pub fn new(cm: &'a CodeMap, out: Box, ann: &'a PpAnn, comments: Option>, literals: Option>, krate: Option<&'a Crate>) -> State<'a> { State { krate: krate, s: pp::mk_printer(out, default_columns), cm: Some(cm), comments: comments.clone(), literals: literals.clone(), cur_cmnt_and_lit: ast_pp::CurrentCommentAndLiteral { cur_cmnt: 0, cur_lit: 0, }, boxes: Vec::new(), ann: ann, } } } pub fn to_string(f: F) -> String where F: FnOnce(&mut State) -> io::Result<()> { let mut wr = Vec::new(); { let mut printer = rust_printer(Box::new(&mut wr), None); f(&mut printer).unwrap(); eof(&mut printer.s).unwrap(); } String::from_utf8(wr).unwrap() } pub fn binop_to_string(op: BinOpToken) -> &'static str { match op { token::Plus => "+", token::Minus => "-", token::Star => "*", token::Slash => "/", token::Percent => "%", token::Caret => "^", token::And => "&", token::Or => "|", token::Shl => "<<", token::Shr => ">>", } } pub fn ty_to_string(ty: &hir::Ty) -> String { to_string(|s| s.print_type(ty)) } pub fn bounds_to_string(bounds: &[hir::TyParamBound]) -> String { to_string(|s| s.print_bounds("", bounds)) } pub fn pat_to_string(pat: &hir::Pat) -> String { to_string(|s| s.print_pat(pat)) } pub fn arm_to_string(arm: &hir::Arm) -> String { to_string(|s| s.print_arm(arm)) } pub fn expr_to_string(e: &hir::Expr) -> String { to_string(|s| s.print_expr(e)) } pub fn lifetime_to_string(e: &hir::Lifetime) -> String { to_string(|s| s.print_lifetime(e)) } pub fn stmt_to_string(stmt: &hir::Stmt) -> String { to_string(|s| s.print_stmt(stmt)) } pub fn item_to_string(i: &hir::Item) -> String { to_string(|s| s.print_item(i)) } pub fn impl_item_to_string(i: &hir::ImplItem) -> String { to_string(|s| s.print_impl_item(i)) } pub fn trait_item_to_string(i: &hir::TraitItem) -> String { to_string(|s| s.print_trait_item(i)) } pub fn generics_to_string(generics: &hir::Generics) -> String { to_string(|s| s.print_generics(generics)) } pub fn where_clause_to_string(i: &hir::WhereClause) -> String { to_string(|s| s.print_where_clause(i)) } pub fn fn_block_to_string(p: &hir::FnDecl) -> String { to_string(|s| s.print_fn_block_args(p)) } pub fn path_to_string(p: &hir::Path) -> String { to_string(|s| s.print_path(p, false, 0)) } pub fn name_to_string(name: ast::Name) -> String { to_string(|s| s.print_name(name)) } pub fn fun_to_string(decl: &hir::FnDecl, unsafety: hir::Unsafety, constness: hir::Constness, name: ast::Name, opt_explicit_self: Option<&hir::ExplicitSelf_>, generics: &hir::Generics) -> String { to_string(|s| { try!(s.head("")); try!(s.print_fn(decl, unsafety, constness, abi::Rust, Some(name), generics, opt_explicit_self, hir::Inherited)); try!(s.end()); // Close the head box s.end() // Close the outer box }) } pub fn block_to_string(blk: &hir::Block) -> String { to_string(|s| { // containing cbox, will be closed by print-block at } try!(s.cbox(indent_unit)); // head-ibox, will be closed by print-block after { try!(s.ibox(0)); s.print_block(blk) }) } pub fn explicit_self_to_string(explicit_self: &hir::ExplicitSelf_) -> String { to_string(|s| s.print_explicit_self(explicit_self, hir::MutImmutable).map(|_| {})) } pub fn variant_to_string(var: &hir::Variant) -> String { to_string(|s| s.print_variant(var)) } pub fn arg_to_string(arg: &hir::Arg) -> String { to_string(|s| s.print_arg(arg)) } pub fn visibility_qualified(vis: hir::Visibility, s: &str) -> String { match vis { hir::Public => format!("pub {}", s), hir::Inherited => s.to_string(), } } fn needs_parentheses(expr: &hir::Expr) -> bool { match expr.node { hir::ExprAssign(..) | hir::ExprBinary(..) | hir::ExprClosure(..) | hir::ExprAssignOp(..) | hir::ExprCast(..) | hir::ExprType(..) => true, _ => false, } } impl<'a> State<'a> { pub fn cbox(&mut self, u: usize) -> io::Result<()> { self.boxes.push(pp::Breaks::Consistent); pp::cbox(&mut self.s, u) } pub fn nbsp(&mut self) -> io::Result<()> { word(&mut self.s, " ") } pub fn word_nbsp(&mut self, w: &str) -> io::Result<()> { try!(word(&mut self.s, w)); self.nbsp() } pub fn head(&mut self, w: &str) -> io::Result<()> { // outer-box is consistent try!(self.cbox(indent_unit)); // head-box is inconsistent try!(self.ibox(w.len() + 1)); // keyword that starts the head if !w.is_empty() { try!(self.word_nbsp(w)); } Ok(()) } pub fn bopen(&mut self) -> io::Result<()> { try!(word(&mut self.s, "{")); self.end() // close the head-box } pub fn bclose_(&mut self, span: codemap::Span, indented: usize) -> io::Result<()> { self.bclose_maybe_open(span, indented, true) } pub fn bclose_maybe_open(&mut self, span: codemap::Span, indented: usize, close_box: bool) -> io::Result<()> { try!(self.maybe_print_comment(span.hi)); try!(self.break_offset_if_not_bol(1, -(indented as isize))); try!(word(&mut self.s, "}")); if close_box { try!(self.end()); // close the outer-box } Ok(()) } pub fn bclose(&mut self, span: codemap::Span) -> io::Result<()> { self.bclose_(span, indent_unit) } pub fn in_cbox(&self) -> bool { match self.boxes.last() { Some(&last_box) => last_box == pp::Breaks::Consistent, None => false, } } pub fn space_if_not_bol(&mut self) -> io::Result<()> { if !self.is_bol() { try!(space(&mut self.s)); } Ok(()) } pub fn break_offset_if_not_bol(&mut self, n: usize, off: isize) -> io::Result<()> { if !self.is_bol() { break_offset(&mut self.s, n, off) } else { if off != 0 && self.s.last_token().is_hardbreak_tok() { // We do something pretty sketchy here: tuck the nonzero // offset-adjustment we were going to deposit along with the // break into the previous hardbreak. self.s.replace_last_token(pp::hardbreak_tok_offset(off)); } Ok(()) } } // Synthesizes a comment that was not textually present in the original source // file. pub fn synth_comment(&mut self, text: String) -> io::Result<()> { try!(word(&mut self.s, "/*")); try!(space(&mut self.s)); try!(word(&mut self.s, &text[..])); try!(space(&mut self.s)); word(&mut self.s, "*/") } pub fn commasep_cmnt(&mut self, b: Breaks, elts: &[T], mut op: F, mut get_span: G) -> io::Result<()> where F: FnMut(&mut State, &T) -> io::Result<()>, G: FnMut(&T) -> codemap::Span { try!(self.rbox(0, b)); let len = elts.len(); let mut i = 0; for elt in elts { try!(self.maybe_print_comment(get_span(elt).hi)); try!(op(self, elt)); i += 1; if i < len { try!(word(&mut self.s, ",")); try!(self.maybe_print_trailing_comment(get_span(elt), Some(get_span(&elts[i]).hi))); try!(self.space_if_not_bol()); } } self.end() } pub fn commasep_exprs(&mut self, b: Breaks, exprs: &[P]) -> io::Result<()> { self.commasep_cmnt(b, exprs, |s, e| s.print_expr(&**e), |e| e.span) } pub fn print_mod(&mut self, _mod: &hir::Mod, attrs: &[ast::Attribute]) -> io::Result<()> { try!(self.print_inner_attributes(attrs)); for item_id in &_mod.item_ids { try!(self.print_item_id(item_id)); } Ok(()) } pub fn print_foreign_mod(&mut self, nmod: &hir::ForeignMod, attrs: &[ast::Attribute]) -> io::Result<()> { try!(self.print_inner_attributes(attrs)); for item in &nmod.items { try!(self.print_foreign_item(item)); } Ok(()) } pub fn print_opt_lifetime(&mut self, lifetime: &Option) -> io::Result<()> { if let Some(l) = *lifetime { try!(self.print_lifetime(&l)); try!(self.nbsp()); } Ok(()) } pub fn print_type(&mut self, ty: &hir::Ty) -> io::Result<()> { try!(self.maybe_print_comment(ty.span.lo)); try!(self.ibox(0)); match ty.node { hir::TyVec(ref ty) => { try!(word(&mut self.s, "[")); try!(self.print_type(&**ty)); try!(word(&mut self.s, "]")); } hir::TyPtr(ref mt) => { try!(word(&mut self.s, "*")); match mt.mutbl { hir::MutMutable => try!(self.word_nbsp("mut")), hir::MutImmutable => try!(self.word_nbsp("const")), } try!(self.print_type(&*mt.ty)); } hir::TyRptr(ref lifetime, ref mt) => { try!(word(&mut self.s, "&")); try!(self.print_opt_lifetime(lifetime)); try!(self.print_mt(mt)); } hir::TyTup(ref elts) => { try!(self.popen()); try!(self.commasep(Inconsistent, &elts[..], |s, ty| s.print_type(&**ty))); if elts.len() == 1 { try!(word(&mut self.s, ",")); } try!(self.pclose()); } hir::TyBareFn(ref f) => { let generics = hir::Generics { lifetimes: f.lifetimes.clone(), ty_params: hir::HirVec::new(), where_clause: hir::WhereClause { id: ast::DUMMY_NODE_ID, predicates: hir::HirVec::new(), }, }; try!(self.print_ty_fn(f.abi, f.unsafety, &*f.decl, None, &generics, None)); } hir::TyPath(None, ref path) => { try!(self.print_path(path, false, 0)); } hir::TyPath(Some(ref qself), ref path) => { try!(self.print_qpath(path, qself, false)) } hir::TyObjectSum(ref ty, ref bounds) => { try!(self.print_type(&**ty)); try!(self.print_bounds("+", &bounds[..])); } hir::TyPolyTraitRef(ref bounds) => { try!(self.print_bounds("", &bounds[..])); } hir::TyFixedLengthVec(ref ty, ref v) => { try!(word(&mut self.s, "[")); try!(self.print_type(&**ty)); try!(word(&mut self.s, "; ")); try!(self.print_expr(&**v)); try!(word(&mut self.s, "]")); } hir::TyTypeof(ref e) => { try!(word(&mut self.s, "typeof(")); try!(self.print_expr(&**e)); try!(word(&mut self.s, ")")); } hir::TyInfer => { try!(word(&mut self.s, "_")); } } self.end() } pub fn print_foreign_item(&mut self, item: &hir::ForeignItem) -> io::Result<()> { try!(self.hardbreak_if_not_bol()); try!(self.maybe_print_comment(item.span.lo)); try!(self.print_outer_attributes(&item.attrs)); match item.node { hir::ForeignItemFn(ref decl, ref generics) => { try!(self.head("")); try!(self.print_fn(decl, hir::Unsafety::Normal, hir::Constness::NotConst, abi::Rust, Some(item.name), generics, None, item.vis)); try!(self.end()); // end head-ibox try!(word(&mut self.s, ";")); self.end() // end the outer fn box } hir::ForeignItemStatic(ref t, m) => { try!(self.head(&visibility_qualified(item.vis, "static"))); if m { try!(self.word_space("mut")); } try!(self.print_name(item.name)); try!(self.word_space(":")); try!(self.print_type(&**t)); try!(word(&mut self.s, ";")); try!(self.end()); // end the head-ibox self.end() // end the outer cbox } } } fn print_associated_const(&mut self, name: ast::Name, ty: &hir::Ty, default: Option<&hir::Expr>, vis: hir::Visibility) -> io::Result<()> { try!(word(&mut self.s, &visibility_qualified(vis, ""))); try!(self.word_space("const")); try!(self.print_name(name)); try!(self.word_space(":")); try!(self.print_type(ty)); if let Some(expr) = default { try!(space(&mut self.s)); try!(self.word_space("=")); try!(self.print_expr(expr)); } word(&mut self.s, ";") } fn print_associated_type(&mut self, name: ast::Name, bounds: Option<&hir::TyParamBounds>, ty: Option<&hir::Ty>) -> io::Result<()> { try!(self.word_space("type")); try!(self.print_name(name)); if let Some(bounds) = bounds { try!(self.print_bounds(":", bounds)); } if let Some(ty) = ty { try!(space(&mut self.s)); try!(self.word_space("=")); try!(self.print_type(ty)); } word(&mut self.s, ";") } pub fn print_item_id(&mut self, item_id: &hir::ItemId) -> io::Result<()> { if let Some(krate) = self.krate { // skip nested items if krate context was not provided let item = &krate.items[&item_id.id]; self.print_item(item) } else { Ok(()) } } /// Pretty-print an item pub fn print_item(&mut self, item: &hir::Item) -> io::Result<()> { try!(self.hardbreak_if_not_bol()); try!(self.maybe_print_comment(item.span.lo)); try!(self.print_outer_attributes(&item.attrs)); try!(self.ann.pre(self, NodeItem(item))); match item.node { hir::ItemExternCrate(ref optional_path) => { try!(self.head(&visibility_qualified(item.vis, "extern crate"))); if let Some(p) = *optional_path { let val = p.as_str(); if val.contains("-") { try!(self.print_string(&val, ast::CookedStr)); } else { try!(self.print_name(p)); } try!(space(&mut self.s)); try!(word(&mut self.s, "as")); try!(space(&mut self.s)); } try!(self.print_name(item.name)); try!(word(&mut self.s, ";")); try!(self.end()); // end inner head-block try!(self.end()); // end outer head-block } hir::ItemUse(ref vp) => { try!(self.head(&visibility_qualified(item.vis, "use"))); try!(self.print_view_path(&**vp)); try!(word(&mut self.s, ";")); try!(self.end()); // end inner head-block try!(self.end()); // end outer head-block } hir::ItemStatic(ref ty, m, ref expr) => { try!(self.head(&visibility_qualified(item.vis, "static"))); if m == hir::MutMutable { try!(self.word_space("mut")); } try!(self.print_name(item.name)); try!(self.word_space(":")); try!(self.print_type(&**ty)); try!(space(&mut self.s)); try!(self.end()); // end the head-ibox try!(self.word_space("=")); try!(self.print_expr(&**expr)); try!(word(&mut self.s, ";")); try!(self.end()); // end the outer cbox } hir::ItemConst(ref ty, ref expr) => { try!(self.head(&visibility_qualified(item.vis, "const"))); try!(self.print_name(item.name)); try!(self.word_space(":")); try!(self.print_type(&**ty)); try!(space(&mut self.s)); try!(self.end()); // end the head-ibox try!(self.word_space("=")); try!(self.print_expr(&**expr)); try!(word(&mut self.s, ";")); try!(self.end()); // end the outer cbox } hir::ItemFn(ref decl, unsafety, constness, abi, ref typarams, ref body) => { try!(self.head("")); try!(self.print_fn(decl, unsafety, constness, abi, Some(item.name), typarams, None, item.vis)); try!(word(&mut self.s, " ")); try!(self.print_block_with_attrs(&**body, &item.attrs)); } hir::ItemMod(ref _mod) => { try!(self.head(&visibility_qualified(item.vis, "mod"))); try!(self.print_name(item.name)); try!(self.nbsp()); try!(self.bopen()); try!(self.print_mod(_mod, &item.attrs)); try!(self.bclose(item.span)); } hir::ItemForeignMod(ref nmod) => { try!(self.head("extern")); try!(self.word_nbsp(&nmod.abi.to_string())); try!(self.bopen()); try!(self.print_foreign_mod(nmod, &item.attrs)); try!(self.bclose(item.span)); } hir::ItemTy(ref ty, ref params) => { try!(self.ibox(indent_unit)); try!(self.ibox(0)); try!(self.word_nbsp(&visibility_qualified(item.vis, "type"))); try!(self.print_name(item.name)); try!(self.print_generics(params)); try!(self.end()); // end the inner ibox try!(self.print_where_clause(¶ms.where_clause)); try!(space(&mut self.s)); try!(self.word_space("=")); try!(self.print_type(&**ty)); try!(word(&mut self.s, ";")); try!(self.end()); // end the outer ibox } hir::ItemEnum(ref enum_definition, ref params) => { try!(self.print_enum_def(enum_definition, params, item.name, item.span, item.vis)); } hir::ItemStruct(ref struct_def, ref generics) => { try!(self.head(&visibility_qualified(item.vis, "struct"))); try!(self.print_struct(struct_def, generics, item.name, item.span, true)); } hir::ItemDefaultImpl(unsafety, ref trait_ref) => { try!(self.head("")); try!(self.print_visibility(item.vis)); try!(self.print_unsafety(unsafety)); try!(self.word_nbsp("impl")); try!(self.print_trait_ref(trait_ref)); try!(space(&mut self.s)); try!(self.word_space("for")); try!(self.word_space("..")); try!(self.bopen()); try!(self.bclose(item.span)); } hir::ItemImpl(unsafety, polarity, ref generics, ref opt_trait, ref ty, ref impl_items) => { try!(self.head("")); try!(self.print_visibility(item.vis)); try!(self.print_unsafety(unsafety)); try!(self.word_nbsp("impl")); if generics.is_parameterized() { try!(self.print_generics(generics)); try!(space(&mut self.s)); } match polarity { hir::ImplPolarity::Negative => { try!(word(&mut self.s, "!")); } _ => {} } match opt_trait { &Some(ref t) => { try!(self.print_trait_ref(t)); try!(space(&mut self.s)); try!(self.word_space("for")); } &None => {} } try!(self.print_type(&**ty)); try!(self.print_where_clause(&generics.where_clause)); try!(space(&mut self.s)); try!(self.bopen()); try!(self.print_inner_attributes(&item.attrs)); for impl_item in impl_items { try!(self.print_impl_item(impl_item)); } try!(self.bclose(item.span)); } hir::ItemTrait(unsafety, ref generics, ref bounds, ref trait_items) => { try!(self.head("")); try!(self.print_visibility(item.vis)); try!(self.print_unsafety(unsafety)); try!(self.word_nbsp("trait")); try!(self.print_name(item.name)); try!(self.print_generics(generics)); let mut real_bounds = Vec::with_capacity(bounds.len()); for b in bounds.iter() { if let TraitTyParamBound(ref ptr, hir::TraitBoundModifier::Maybe) = *b { try!(space(&mut self.s)); try!(self.word_space("for ?")); try!(self.print_trait_ref(&ptr.trait_ref)); } else { real_bounds.push(b.clone()); } } try!(self.print_bounds(":", &real_bounds[..])); try!(self.print_where_clause(&generics.where_clause)); try!(word(&mut self.s, " ")); try!(self.bopen()); for trait_item in trait_items { try!(self.print_trait_item(trait_item)); } try!(self.bclose(item.span)); } } self.ann.post(self, NodeItem(item)) } fn print_trait_ref(&mut self, t: &hir::TraitRef) -> io::Result<()> { self.print_path(&t.path, false, 0) } fn print_formal_lifetime_list(&mut self, lifetimes: &[hir::LifetimeDef]) -> io::Result<()> { if !lifetimes.is_empty() { try!(word(&mut self.s, "for<")); let mut comma = false; for lifetime_def in lifetimes { if comma { try!(self.word_space(",")) } try!(self.print_lifetime_def(lifetime_def)); comma = true; } try!(word(&mut self.s, ">")); } Ok(()) } fn print_poly_trait_ref(&mut self, t: &hir::PolyTraitRef) -> io::Result<()> { try!(self.print_formal_lifetime_list(&t.bound_lifetimes)); self.print_trait_ref(&t.trait_ref) } pub fn print_enum_def(&mut self, enum_definition: &hir::EnumDef, generics: &hir::Generics, name: ast::Name, span: codemap::Span, visibility: hir::Visibility) -> io::Result<()> { try!(self.head(&visibility_qualified(visibility, "enum"))); try!(self.print_name(name)); try!(self.print_generics(generics)); try!(self.print_where_clause(&generics.where_clause)); try!(space(&mut self.s)); self.print_variants(&enum_definition.variants, span) } pub fn print_variants(&mut self, variants: &[hir::Variant], span: codemap::Span) -> io::Result<()> { try!(self.bopen()); for v in variants { try!(self.space_if_not_bol()); try!(self.maybe_print_comment(v.span.lo)); try!(self.print_outer_attributes(&v.node.attrs)); try!(self.ibox(indent_unit)); try!(self.print_variant(v)); try!(word(&mut self.s, ",")); try!(self.end()); try!(self.maybe_print_trailing_comment(v.span, None)); } self.bclose(span) } pub fn print_visibility(&mut self, vis: hir::Visibility) -> io::Result<()> { match vis { hir::Public => self.word_nbsp("pub"), hir::Inherited => Ok(()), } } pub fn print_struct(&mut self, struct_def: &hir::VariantData, generics: &hir::Generics, name: ast::Name, span: codemap::Span, print_finalizer: bool) -> io::Result<()> { try!(self.print_name(name)); try!(self.print_generics(generics)); if !struct_def.is_struct() { if struct_def.is_tuple() { try!(self.popen()); try!(self.commasep(Inconsistent, struct_def.fields(), |s, field| { match field.node.kind { hir::NamedField(..) => panic!("unexpected named field"), hir::UnnamedField(vis) => { try!(s.print_visibility(vis)); try!(s.maybe_print_comment(field.span.lo)); s.print_type(&*field.node.ty) } } })); try!(self.pclose()); } try!(self.print_where_clause(&generics.where_clause)); if print_finalizer { try!(word(&mut self.s, ";")); } try!(self.end()); self.end() // close the outer-box } else { try!(self.print_where_clause(&generics.where_clause)); try!(self.nbsp()); try!(self.bopen()); try!(self.hardbreak_if_not_bol()); for field in struct_def.fields() { match field.node.kind { hir::UnnamedField(..) => panic!("unexpected unnamed field"), hir::NamedField(name, visibility) => { try!(self.hardbreak_if_not_bol()); try!(self.maybe_print_comment(field.span.lo)); try!(self.print_outer_attributes(&field.node.attrs)); try!(self.print_visibility(visibility)); try!(self.print_name(name)); try!(self.word_nbsp(":")); try!(self.print_type(&*field.node.ty)); try!(word(&mut self.s, ",")); } } } self.bclose(span) } } pub fn print_variant(&mut self, v: &hir::Variant) -> io::Result<()> { try!(self.head("")); let generics = ::util::empty_generics(); try!(self.print_struct(&v.node.data, &generics, v.node.name, v.span, false)); match v.node.disr_expr { Some(ref d) => { try!(space(&mut self.s)); try!(self.word_space("=")); self.print_expr(&**d) } _ => Ok(()), } } pub fn print_method_sig(&mut self, name: ast::Name, m: &hir::MethodSig, vis: hir::Visibility) -> io::Result<()> { self.print_fn(&m.decl, m.unsafety, m.constness, m.abi, Some(name), &m.generics, Some(&m.explicit_self.node), vis) } pub fn print_trait_item(&mut self, ti: &hir::TraitItem) -> io::Result<()> { try!(self.ann.pre(self, NodeSubItem(ti.id))); try!(self.hardbreak_if_not_bol()); try!(self.maybe_print_comment(ti.span.lo)); try!(self.print_outer_attributes(&ti.attrs)); match ti.node { hir::ConstTraitItem(ref ty, ref default) => { try!(self.print_associated_const(ti.name, &ty, default.as_ref().map(|expr| &**expr), hir::Inherited)); } hir::MethodTraitItem(ref sig, ref body) => { if body.is_some() { try!(self.head("")); } try!(self.print_method_sig(ti.name, sig, hir::Inherited)); if let Some(ref body) = *body { try!(self.nbsp()); try!(self.print_block_with_attrs(body, &ti.attrs)); } else { try!(word(&mut self.s, ";")); } } hir::TypeTraitItem(ref bounds, ref default) => { try!(self.print_associated_type(ti.name, Some(bounds), default.as_ref().map(|ty| &**ty))); } } self.ann.post(self, NodeSubItem(ti.id)) } pub fn print_impl_item(&mut self, ii: &hir::ImplItem) -> io::Result<()> { try!(self.ann.pre(self, NodeSubItem(ii.id))); try!(self.hardbreak_if_not_bol()); try!(self.maybe_print_comment(ii.span.lo)); try!(self.print_outer_attributes(&ii.attrs)); match ii.node { hir::ImplItemKind::Const(ref ty, ref expr) => { try!(self.print_associated_const(ii.name, &ty, Some(&expr), ii.vis)); } hir::ImplItemKind::Method(ref sig, ref body) => { try!(self.head("")); try!(self.print_method_sig(ii.name, sig, ii.vis)); try!(self.nbsp()); try!(self.print_block_with_attrs(body, &ii.attrs)); } hir::ImplItemKind::Type(ref ty) => { try!(self.print_associated_type(ii.name, None, Some(ty))); } } self.ann.post(self, NodeSubItem(ii.id)) } pub fn print_stmt(&mut self, st: &hir::Stmt) -> io::Result<()> { try!(self.maybe_print_comment(st.span.lo)); match st.node { hir::StmtDecl(ref decl, _) => { try!(self.print_decl(&**decl)); } hir::StmtExpr(ref expr, _) => { try!(self.space_if_not_bol()); try!(self.print_expr(&**expr)); } hir::StmtSemi(ref expr, _) => { try!(self.space_if_not_bol()); try!(self.print_expr(&**expr)); try!(word(&mut self.s, ";")); } } if stmt_ends_with_semi(&st.node) { try!(word(&mut self.s, ";")); } self.maybe_print_trailing_comment(st.span, None) } pub fn print_block(&mut self, blk: &hir::Block) -> io::Result<()> { self.print_block_with_attrs(blk, &[]) } pub fn print_block_unclosed(&mut self, blk: &hir::Block) -> io::Result<()> { self.print_block_unclosed_indent(blk, indent_unit) } pub fn print_block_unclosed_indent(&mut self, blk: &hir::Block, indented: usize) -> io::Result<()> { self.print_block_maybe_unclosed(blk, indented, &[], false) } pub fn print_block_with_attrs(&mut self, blk: &hir::Block, attrs: &[ast::Attribute]) -> io::Result<()> { self.print_block_maybe_unclosed(blk, indent_unit, attrs, true) } pub fn print_block_maybe_unclosed(&mut self, blk: &hir::Block, indented: usize, attrs: &[ast::Attribute], close_box: bool) -> io::Result<()> { match blk.rules { hir::UnsafeBlock(..) => try!(self.word_space("unsafe")), hir::PushUnsafeBlock(..) => try!(self.word_space("push_unsafe")), hir::PopUnsafeBlock(..) => try!(self.word_space("pop_unsafe")), hir::PushUnstableBlock => try!(self.word_space("push_unstable")), hir::PopUnstableBlock => try!(self.word_space("pop_unstable")), hir::DefaultBlock => (), } try!(self.maybe_print_comment(blk.span.lo)); try!(self.ann.pre(self, NodeBlock(blk))); try!(self.bopen()); try!(self.print_inner_attributes(attrs)); for st in &blk.stmts { try!(self.print_stmt(st)); } match blk.expr { Some(ref expr) => { try!(self.space_if_not_bol()); try!(self.print_expr(&**expr)); try!(self.maybe_print_trailing_comment(expr.span, Some(blk.span.hi))); } _ => (), } try!(self.bclose_maybe_open(blk.span, indented, close_box)); self.ann.post(self, NodeBlock(blk)) } fn print_else(&mut self, els: Option<&hir::Expr>) -> io::Result<()> { match els { Some(_else) => { match _else.node { // "another else-if" hir::ExprIf(ref i, ref then, ref e) => { try!(self.cbox(indent_unit - 1)); try!(self.ibox(0)); try!(word(&mut self.s, " else if ")); try!(self.print_expr(&**i)); try!(space(&mut self.s)); try!(self.print_block(&**then)); self.print_else(e.as_ref().map(|e| &**e)) } // "final else" hir::ExprBlock(ref b) => { try!(self.cbox(indent_unit - 1)); try!(self.ibox(0)); try!(word(&mut self.s, " else ")); self.print_block(&**b) } // BLEAH, constraints would be great here _ => { panic!("print_if saw if with weird alternative"); } } } _ => Ok(()), } } pub fn print_if(&mut self, test: &hir::Expr, blk: &hir::Block, elseopt: Option<&hir::Expr>) -> io::Result<()> { try!(self.head("if")); try!(self.print_expr(test)); try!(space(&mut self.s)); try!(self.print_block(blk)); self.print_else(elseopt) } pub fn print_if_let(&mut self, pat: &hir::Pat, expr: &hir::Expr, blk: &hir::Block, elseopt: Option<&hir::Expr>) -> io::Result<()> { try!(self.head("if let")); try!(self.print_pat(pat)); try!(space(&mut self.s)); try!(self.word_space("=")); try!(self.print_expr(expr)); try!(space(&mut self.s)); try!(self.print_block(blk)); self.print_else(elseopt) } fn print_call_post(&mut self, args: &[P]) -> io::Result<()> { try!(self.popen()); try!(self.commasep_exprs(Inconsistent, args)); self.pclose() } pub fn print_expr_maybe_paren(&mut self, expr: &hir::Expr) -> io::Result<()> { let needs_par = needs_parentheses(expr); if needs_par { try!(self.popen()); } try!(self.print_expr(expr)); if needs_par { try!(self.pclose()); } Ok(()) } fn print_expr_vec(&mut self, exprs: &[P]) -> io::Result<()> { try!(self.ibox(indent_unit)); try!(word(&mut self.s, "[")); try!(self.commasep_exprs(Inconsistent, &exprs[..])); try!(word(&mut self.s, "]")); self.end() } fn print_expr_repeat(&mut self, element: &hir::Expr, count: &hir::Expr) -> io::Result<()> { try!(self.ibox(indent_unit)); try!(word(&mut self.s, "[")); try!(self.print_expr(element)); try!(self.word_space(";")); try!(self.print_expr(count)); try!(word(&mut self.s, "]")); self.end() } fn print_expr_struct(&mut self, path: &hir::Path, fields: &[hir::Field], wth: &Option>) -> io::Result<()> { try!(self.print_path(path, true, 0)); try!(word(&mut self.s, "{")); try!(self.commasep_cmnt(Consistent, &fields[..], |s, field| { try!(s.ibox(indent_unit)); try!(s.print_name(field.name.node)); try!(s.word_space(":")); try!(s.print_expr(&*field.expr)); s.end() }, |f| f.span)); match *wth { Some(ref expr) => { try!(self.ibox(indent_unit)); if !fields.is_empty() { try!(word(&mut self.s, ",")); try!(space(&mut self.s)); } try!(word(&mut self.s, "..")); try!(self.print_expr(&**expr)); try!(self.end()); } _ => if !fields.is_empty() { try!(word(&mut self.s, ",")) }, } try!(word(&mut self.s, "}")); Ok(()) } fn print_expr_tup(&mut self, exprs: &[P]) -> io::Result<()> { try!(self.popen()); try!(self.commasep_exprs(Inconsistent, &exprs[..])); if exprs.len() == 1 { try!(word(&mut self.s, ",")); } self.pclose() } fn print_expr_call(&mut self, func: &hir::Expr, args: &[P]) -> io::Result<()> { try!(self.print_expr_maybe_paren(func)); self.print_call_post(args) } fn print_expr_method_call(&mut self, name: Spanned, tys: &[P], args: &[P]) -> io::Result<()> { let base_args = &args[1..]; try!(self.print_expr(&*args[0])); try!(word(&mut self.s, ".")); try!(self.print_name(name.node)); if !tys.is_empty() { try!(word(&mut self.s, "::<")); try!(self.commasep(Inconsistent, tys, |s, ty| s.print_type(&**ty))); try!(word(&mut self.s, ">")); } self.print_call_post(base_args) } fn print_expr_binary(&mut self, op: hir::BinOp, lhs: &hir::Expr, rhs: &hir::Expr) -> io::Result<()> { try!(self.print_expr(lhs)); try!(space(&mut self.s)); try!(self.word_space(::util::binop_to_string(op.node))); self.print_expr(rhs) } fn print_expr_unary(&mut self, op: hir::UnOp, expr: &hir::Expr) -> io::Result<()> { try!(word(&mut self.s, ::util::unop_to_string(op))); self.print_expr_maybe_paren(expr) } fn print_expr_addr_of(&mut self, mutability: hir::Mutability, expr: &hir::Expr) -> io::Result<()> { try!(word(&mut self.s, "&")); try!(self.print_mutability(mutability)); self.print_expr_maybe_paren(expr) } pub fn print_expr(&mut self, expr: &hir::Expr) -> io::Result<()> { try!(self.maybe_print_comment(expr.span.lo)); try!(self.ibox(indent_unit)); try!(self.ann.pre(self, NodeExpr(expr))); match expr.node { hir::ExprBox(ref expr) => { try!(self.word_space("box")); try!(self.print_expr(expr)); } hir::ExprVec(ref exprs) => { try!(self.print_expr_vec(&exprs[..])); } hir::ExprRepeat(ref element, ref count) => { try!(self.print_expr_repeat(&**element, &**count)); } hir::ExprStruct(ref path, ref fields, ref wth) => { try!(self.print_expr_struct(path, &fields[..], wth)); } hir::ExprTup(ref exprs) => { try!(self.print_expr_tup(&exprs[..])); } hir::ExprCall(ref func, ref args) => { try!(self.print_expr_call(&**func, &args[..])); } hir::ExprMethodCall(name, ref tys, ref args) => { try!(self.print_expr_method_call(name, &tys[..], &args[..])); } hir::ExprBinary(op, ref lhs, ref rhs) => { try!(self.print_expr_binary(op, &**lhs, &**rhs)); } hir::ExprUnary(op, ref expr) => { try!(self.print_expr_unary(op, &**expr)); } hir::ExprAddrOf(m, ref expr) => { try!(self.print_expr_addr_of(m, &**expr)); } hir::ExprLit(ref lit) => { try!(self.print_literal(&**lit)); } hir::ExprCast(ref expr, ref ty) => { try!(self.print_expr(&**expr)); try!(space(&mut self.s)); try!(self.word_space("as")); try!(self.print_type(&**ty)); } hir::ExprType(ref expr, ref ty) => { try!(self.print_expr(&**expr)); try!(self.word_space(":")); try!(self.print_type(&**ty)); } hir::ExprIf(ref test, ref blk, ref elseopt) => { try!(self.print_if(&**test, &**blk, elseopt.as_ref().map(|e| &**e))); } hir::ExprWhile(ref test, ref blk, opt_ident) => { if let Some(ident) = opt_ident { try!(self.print_name(ident.name)); try!(self.word_space(":")); } try!(self.head("while")); try!(self.print_expr(&**test)); try!(space(&mut self.s)); try!(self.print_block(&**blk)); } hir::ExprLoop(ref blk, opt_ident) => { if let Some(ident) = opt_ident { try!(self.print_name(ident.name)); try!(self.word_space(":")); } try!(self.head("loop")); try!(space(&mut self.s)); try!(self.print_block(&**blk)); } hir::ExprMatch(ref expr, ref arms, _) => { try!(self.cbox(indent_unit)); try!(self.ibox(4)); try!(self.word_nbsp("match")); try!(self.print_expr(&**expr)); try!(space(&mut self.s)); try!(self.bopen()); for arm in arms { try!(self.print_arm(arm)); } try!(self.bclose_(expr.span, indent_unit)); } hir::ExprClosure(capture_clause, ref decl, ref body) => { try!(self.print_capture_clause(capture_clause)); try!(self.print_fn_block_args(&**decl)); try!(space(&mut self.s)); let default_return = match decl.output { hir::DefaultReturn(..) => true, _ => false, }; if !default_return || !body.stmts.is_empty() || body.expr.is_none() { try!(self.print_block_unclosed(&**body)); } else { // we extract the block, so as not to create another set of boxes match body.expr.as_ref().unwrap().node { hir::ExprBlock(ref blk) => { try!(self.print_block_unclosed(&**blk)); } _ => { // this is a bare expression try!(self.print_expr(body.expr.as_ref().map(|e| &**e).unwrap())); try!(self.end()); // need to close a box } } } // a box will be closed by print_expr, but we didn't want an overall // wrapper so we closed the corresponding opening. so create an // empty box to satisfy the close. try!(self.ibox(0)); } hir::ExprBlock(ref blk) => { // containing cbox, will be closed by print-block at } try!(self.cbox(indent_unit)); // head-box, will be closed by print-block after { try!(self.ibox(0)); try!(self.print_block(&**blk)); } hir::ExprAssign(ref lhs, ref rhs) => { try!(self.print_expr(&**lhs)); try!(space(&mut self.s)); try!(self.word_space("=")); try!(self.print_expr(&**rhs)); } hir::ExprAssignOp(op, ref lhs, ref rhs) => { try!(self.print_expr(&**lhs)); try!(space(&mut self.s)); try!(word(&mut self.s, ::util::binop_to_string(op.node))); try!(self.word_space("=")); try!(self.print_expr(&**rhs)); } hir::ExprField(ref expr, name) => { try!(self.print_expr(&**expr)); try!(word(&mut self.s, ".")); try!(self.print_name(name.node)); } hir::ExprTupField(ref expr, id) => { try!(self.print_expr(&**expr)); try!(word(&mut self.s, ".")); try!(self.print_usize(id.node)); } hir::ExprIndex(ref expr, ref index) => { try!(self.print_expr(&**expr)); try!(word(&mut self.s, "[")); try!(self.print_expr(&**index)); try!(word(&mut self.s, "]")); } hir::ExprRange(ref start, ref end) => { if let &Some(ref e) = start { try!(self.print_expr(&**e)); } try!(word(&mut self.s, "..")); if let &Some(ref e) = end { try!(self.print_expr(&**e)); } } hir::ExprPath(None, ref path) => { try!(self.print_path(path, true, 0)) } hir::ExprPath(Some(ref qself), ref path) => { try!(self.print_qpath(path, qself, true)) } hir::ExprBreak(opt_ident) => { try!(word(&mut self.s, "break")); try!(space(&mut self.s)); if let Some(ident) = opt_ident { try!(self.print_name(ident.node.name)); try!(space(&mut self.s)); } } hir::ExprAgain(opt_ident) => { try!(word(&mut self.s, "continue")); try!(space(&mut self.s)); if let Some(ident) = opt_ident { try!(self.print_name(ident.node.name)); try!(space(&mut self.s)) } } hir::ExprRet(ref result) => { try!(word(&mut self.s, "return")); match *result { Some(ref expr) => { try!(word(&mut self.s, " ")); try!(self.print_expr(&**expr)); } _ => (), } } hir::ExprInlineAsm(ref a) => { try!(word(&mut self.s, "asm!")); try!(self.popen()); try!(self.print_string(&a.asm, a.asm_str_style)); try!(self.word_space(":")); try!(self.commasep(Inconsistent, &a.outputs, |s, out| { match out.constraint.slice_shift_char() { Some(('=', operand)) if out.is_rw => { try!(s.print_string(&format!("+{}", operand), ast::CookedStr)) } _ => try!(s.print_string(&out.constraint, ast::CookedStr)), } try!(s.popen()); try!(s.print_expr(&*out.expr)); try!(s.pclose()); Ok(()) })); try!(space(&mut self.s)); try!(self.word_space(":")); try!(self.commasep(Inconsistent, &a.inputs, |s, &(ref co, ref o)| { try!(s.print_string(&co, ast::CookedStr)); try!(s.popen()); try!(s.print_expr(&**o)); try!(s.pclose()); Ok(()) })); try!(space(&mut self.s)); try!(self.word_space(":")); try!(self.commasep(Inconsistent, &a.clobbers, |s, co| { try!(s.print_string(&co, ast::CookedStr)); Ok(()) })); let mut options = vec![]; if a.volatile { options.push("volatile"); } if a.alignstack { options.push("alignstack"); } if a.dialect == ast::AsmDialect::Intel { options.push("intel"); } if !options.is_empty() { try!(space(&mut self.s)); try!(self.word_space(":")); try!(self.commasep(Inconsistent, &*options, |s, &co| { try!(s.print_string(co, ast::CookedStr)); Ok(()) })); } try!(self.pclose()); } } try!(self.ann.post(self, NodeExpr(expr))); self.end() } pub fn print_local_decl(&mut self, loc: &hir::Local) -> io::Result<()> { try!(self.print_pat(&*loc.pat)); if let Some(ref ty) = loc.ty { try!(self.word_space(":")); try!(self.print_type(&**ty)); } Ok(()) } pub fn print_decl(&mut self, decl: &hir::Decl) -> io::Result<()> { try!(self.maybe_print_comment(decl.span.lo)); match decl.node { hir::DeclLocal(ref loc) => { try!(self.space_if_not_bol()); try!(self.ibox(indent_unit)); try!(self.word_nbsp("let")); try!(self.ibox(indent_unit)); try!(self.print_local_decl(&**loc)); try!(self.end()); if let Some(ref init) = loc.init { try!(self.nbsp()); try!(self.word_space("=")); try!(self.print_expr(&**init)); } self.end() } hir::DeclItem(ref item) => { self.print_item_id(item) } } } pub fn print_usize(&mut self, i: usize) -> io::Result<()> { word(&mut self.s, &i.to_string()) } pub fn print_name(&mut self, name: ast::Name) -> io::Result<()> { try!(word(&mut self.s, &name.as_str())); self.ann.post(self, NodeName(&name)) } pub fn print_for_decl(&mut self, loc: &hir::Local, coll: &hir::Expr) -> io::Result<()> { try!(self.print_local_decl(loc)); try!(space(&mut self.s)); try!(self.word_space("in")); self.print_expr(coll) } fn print_path(&mut self, path: &hir::Path, colons_before_params: bool, depth: usize) -> io::Result<()> { try!(self.maybe_print_comment(path.span.lo)); let mut first = !path.global; for segment in &path.segments[..path.segments.len() - depth] { if first { first = false } else { try!(word(&mut self.s, "::")) } try!(self.print_name(segment.identifier.name)); try!(self.print_path_parameters(&segment.parameters, colons_before_params)); } Ok(()) } fn print_qpath(&mut self, path: &hir::Path, qself: &hir::QSelf, colons_before_params: bool) -> io::Result<()> { try!(word(&mut self.s, "<")); try!(self.print_type(&qself.ty)); if qself.position > 0 { try!(space(&mut self.s)); try!(self.word_space("as")); let depth = path.segments.len() - qself.position; try!(self.print_path(&path, false, depth)); } try!(word(&mut self.s, ">")); try!(word(&mut self.s, "::")); let item_segment = path.segments.last().unwrap(); try!(self.print_name(item_segment.identifier.name)); self.print_path_parameters(&item_segment.parameters, colons_before_params) } fn print_path_parameters(&mut self, parameters: &hir::PathParameters, colons_before_params: bool) -> io::Result<()> { if parameters.is_empty() { return Ok(()); } if colons_before_params { try!(word(&mut self.s, "::")) } match *parameters { hir::AngleBracketedParameters(ref data) => { try!(word(&mut self.s, "<")); let mut comma = false; for lifetime in &data.lifetimes { if comma { try!(self.word_space(",")) } try!(self.print_lifetime(lifetime)); comma = true; } if !data.types.is_empty() { if comma { try!(self.word_space(",")) } try!(self.commasep(Inconsistent, &data.types, |s, ty| s.print_type(&**ty))); comma = true; } for binding in data.bindings.iter() { if comma { try!(self.word_space(",")) } try!(self.print_name(binding.name)); try!(space(&mut self.s)); try!(self.word_space("=")); try!(self.print_type(&*binding.ty)); comma = true; } try!(word(&mut self.s, ">")) } hir::ParenthesizedParameters(ref data) => { try!(word(&mut self.s, "(")); try!(self.commasep(Inconsistent, &data.inputs, |s, ty| s.print_type(&**ty))); try!(word(&mut self.s, ")")); match data.output { None => {} Some(ref ty) => { try!(self.space_if_not_bol()); try!(self.word_space("->")); try!(self.print_type(&**ty)); } } } } Ok(()) } pub fn print_pat(&mut self, pat: &hir::Pat) -> io::Result<()> { try!(self.maybe_print_comment(pat.span.lo)); try!(self.ann.pre(self, NodePat(pat))); // Pat isn't normalized, but the beauty of it // is that it doesn't matter match pat.node { hir::PatWild => try!(word(&mut self.s, "_")), hir::PatIdent(binding_mode, ref path1, ref sub) => { match binding_mode { hir::BindByRef(mutbl) => { try!(self.word_nbsp("ref")); try!(self.print_mutability(mutbl)); } hir::BindByValue(hir::MutImmutable) => {} hir::BindByValue(hir::MutMutable) => { try!(self.word_nbsp("mut")); } } try!(self.print_name(path1.node.name)); match *sub { Some(ref p) => { try!(word(&mut self.s, "@")); try!(self.print_pat(&**p)); } None => (), } } hir::PatEnum(ref path, ref args_) => { try!(self.print_path(path, true, 0)); match *args_ { None => try!(word(&mut self.s, "(..)")), Some(ref args) => { if !args.is_empty() { try!(self.popen()); try!(self.commasep(Inconsistent, &args[..], |s, p| s.print_pat(&**p))); try!(self.pclose()); } } } } hir::PatQPath(ref qself, ref path) => { try!(self.print_qpath(path, qself, false)); } hir::PatStruct(ref path, ref fields, etc) => { try!(self.print_path(path, true, 0)); try!(self.nbsp()); try!(self.word_space("{")); try!(self.commasep_cmnt(Consistent, &fields[..], |s, f| { try!(s.cbox(indent_unit)); if !f.node.is_shorthand { try!(s.print_name(f.node.name)); try!(s.word_nbsp(":")); } try!(s.print_pat(&*f.node.pat)); s.end() }, |f| f.node.pat.span)); if etc { if !fields.is_empty() { try!(self.word_space(",")); } try!(word(&mut self.s, "..")); } try!(space(&mut self.s)); try!(word(&mut self.s, "}")); } hir::PatTup(ref elts) => { try!(self.popen()); try!(self.commasep(Inconsistent, &elts[..], |s, p| s.print_pat(&**p))); if elts.len() == 1 { try!(word(&mut self.s, ",")); } try!(self.pclose()); } hir::PatBox(ref inner) => { try!(word(&mut self.s, "box ")); try!(self.print_pat(&**inner)); } hir::PatRegion(ref inner, mutbl) => { try!(word(&mut self.s, "&")); if mutbl == hir::MutMutable { try!(word(&mut self.s, "mut ")); } try!(self.print_pat(&**inner)); } hir::PatLit(ref e) => try!(self.print_expr(&**e)), hir::PatRange(ref begin, ref end) => { try!(self.print_expr(&**begin)); try!(space(&mut self.s)); try!(word(&mut self.s, "...")); try!(self.print_expr(&**end)); } hir::PatVec(ref before, ref slice, ref after) => { try!(word(&mut self.s, "[")); try!(self.commasep(Inconsistent, &before[..], |s, p| s.print_pat(&**p))); if let Some(ref p) = *slice { if !before.is_empty() { try!(self.word_space(",")); } if p.node != hir::PatWild { try!(self.print_pat(&**p)); } try!(word(&mut self.s, "..")); if !after.is_empty() { try!(self.word_space(",")); } } try!(self.commasep(Inconsistent, &after[..], |s, p| s.print_pat(&**p))); try!(word(&mut self.s, "]")); } } self.ann.post(self, NodePat(pat)) } fn print_arm(&mut self, arm: &hir::Arm) -> io::Result<()> { // I have no idea why this check is necessary, but here it // is :( if arm.attrs.is_empty() { try!(space(&mut self.s)); } try!(self.cbox(indent_unit)); try!(self.ibox(0)); try!(self.print_outer_attributes(&arm.attrs)); let mut first = true; for p in &arm.pats { if first { first = false; } else { try!(space(&mut self.s)); try!(self.word_space("|")); } try!(self.print_pat(&**p)); } try!(space(&mut self.s)); if let Some(ref e) = arm.guard { try!(self.word_space("if")); try!(self.print_expr(&**e)); try!(space(&mut self.s)); } try!(self.word_space("=>")); match arm.body.node { hir::ExprBlock(ref blk) => { // the block will close the pattern's ibox try!(self.print_block_unclosed_indent(&**blk, indent_unit)); // If it is a user-provided unsafe block, print a comma after it if let hir::UnsafeBlock(hir::UserProvided) = blk.rules { try!(word(&mut self.s, ",")); } } _ => { try!(self.end()); // close the ibox for the pattern try!(self.print_expr(&*arm.body)); try!(word(&mut self.s, ",")); } } self.end() // close enclosing cbox } // Returns whether it printed anything fn print_explicit_self(&mut self, explicit_self: &hir::ExplicitSelf_, mutbl: hir::Mutability) -> io::Result { try!(self.print_mutability(mutbl)); match *explicit_self { hir::SelfStatic => { return Ok(false); } hir::SelfValue(_) => { try!(word(&mut self.s, "self")); } hir::SelfRegion(ref lt, m, _) => { try!(word(&mut self.s, "&")); try!(self.print_opt_lifetime(lt)); try!(self.print_mutability(m)); try!(word(&mut self.s, "self")); } hir::SelfExplicit(ref typ, _) => { try!(word(&mut self.s, "self")); try!(self.word_space(":")); try!(self.print_type(&**typ)); } } return Ok(true); } pub fn print_fn(&mut self, decl: &hir::FnDecl, unsafety: hir::Unsafety, constness: hir::Constness, abi: abi::Abi, name: Option, generics: &hir::Generics, opt_explicit_self: Option<&hir::ExplicitSelf_>, vis: hir::Visibility) -> io::Result<()> { try!(self.print_fn_header_info(unsafety, constness, abi, vis)); if let Some(name) = name { try!(self.nbsp()); try!(self.print_name(name)); } try!(self.print_generics(generics)); try!(self.print_fn_args_and_ret(decl, opt_explicit_self)); self.print_where_clause(&generics.where_clause) } pub fn print_fn_args(&mut self, decl: &hir::FnDecl, opt_explicit_self: Option<&hir::ExplicitSelf_>) -> io::Result<()> { // It is unfortunate to duplicate the commasep logic, but we want the // self type and the args all in the same box. try!(self.rbox(0, Inconsistent)); let mut first = true; if let Some(explicit_self) = opt_explicit_self { let m = match explicit_self { &hir::SelfStatic => hir::MutImmutable, _ => match decl.inputs[0].pat.node { hir::PatIdent(hir::BindByValue(m), _, _) => m, _ => hir::MutImmutable, }, }; first = !try!(self.print_explicit_self(explicit_self, m)); } // HACK(eddyb) ignore the separately printed self argument. let args = if first { &decl.inputs[..] } else { &decl.inputs[1..] }; for arg in args { if first { first = false; } else { try!(self.word_space(",")); } try!(self.print_arg(arg)); } self.end() } pub fn print_fn_args_and_ret(&mut self, decl: &hir::FnDecl, opt_explicit_self: Option<&hir::ExplicitSelf_>) -> io::Result<()> { try!(self.popen()); try!(self.print_fn_args(decl, opt_explicit_self)); if decl.variadic { try!(word(&mut self.s, ", ...")); } try!(self.pclose()); self.print_fn_output(decl) } pub fn print_fn_block_args(&mut self, decl: &hir::FnDecl) -> io::Result<()> { try!(word(&mut self.s, "|")); try!(self.print_fn_args(decl, None)); try!(word(&mut self.s, "|")); if let hir::DefaultReturn(..) = decl.output { return Ok(()); } try!(self.space_if_not_bol()); try!(self.word_space("->")); match decl.output { hir::Return(ref ty) => { try!(self.print_type(&**ty)); self.maybe_print_comment(ty.span.lo) } hir::DefaultReturn(..) => unreachable!(), hir::NoReturn(span) => { try!(self.word_nbsp("!")); self.maybe_print_comment(span.lo) } } } pub fn print_capture_clause(&mut self, capture_clause: hir::CaptureClause) -> io::Result<()> { match capture_clause { hir::CaptureByValue => self.word_space("move"), hir::CaptureByRef => Ok(()), } } pub fn print_bounds(&mut self, prefix: &str, bounds: &[hir::TyParamBound]) -> io::Result<()> { if !bounds.is_empty() { try!(word(&mut self.s, prefix)); let mut first = true; for bound in bounds { try!(self.nbsp()); if first { first = false; } else { try!(self.word_space("+")); } try!(match *bound { TraitTyParamBound(ref tref, TraitBoundModifier::None) => { self.print_poly_trait_ref(tref) } TraitTyParamBound(ref tref, TraitBoundModifier::Maybe) => { try!(word(&mut self.s, "?")); self.print_poly_trait_ref(tref) } RegionTyParamBound(ref lt) => { self.print_lifetime(lt) } }) } Ok(()) } else { Ok(()) } } pub fn print_lifetime(&mut self, lifetime: &hir::Lifetime) -> io::Result<()> { self.print_name(lifetime.name) } pub fn print_lifetime_def(&mut self, lifetime: &hir::LifetimeDef) -> io::Result<()> { try!(self.print_lifetime(&lifetime.lifetime)); let mut sep = ":"; for v in &lifetime.bounds { try!(word(&mut self.s, sep)); try!(self.print_lifetime(v)); sep = "+"; } Ok(()) } pub fn print_generics(&mut self, generics: &hir::Generics) -> io::Result<()> { let total = generics.lifetimes.len() + generics.ty_params.len(); if total == 0 { return Ok(()); } try!(word(&mut self.s, "<")); let mut ints = Vec::new(); for i in 0..total { ints.push(i); } try!(self.commasep(Inconsistent, &ints[..], |s, &idx| { if idx < generics.lifetimes.len() { let lifetime = &generics.lifetimes[idx]; s.print_lifetime_def(lifetime) } else { let idx = idx - generics.lifetimes.len(); let param = &generics.ty_params[idx]; s.print_ty_param(param) } })); try!(word(&mut self.s, ">")); Ok(()) } pub fn print_ty_param(&mut self, param: &hir::TyParam) -> io::Result<()> { try!(self.print_name(param.name)); try!(self.print_bounds(":", ¶m.bounds)); match param.default { Some(ref default) => { try!(space(&mut self.s)); try!(self.word_space("=")); self.print_type(&**default) } _ => Ok(()), } } pub fn print_where_clause(&mut self, where_clause: &hir::WhereClause) -> io::Result<()> { if where_clause.predicates.is_empty() { return Ok(()); } try!(space(&mut self.s)); try!(self.word_space("where")); for (i, predicate) in where_clause.predicates.iter().enumerate() { if i != 0 { try!(self.word_space(",")); } match predicate { &hir::WherePredicate::BoundPredicate(hir::WhereBoundPredicate{ref bound_lifetimes, ref bounded_ty, ref bounds, ..}) => { try!(self.print_formal_lifetime_list(bound_lifetimes)); try!(self.print_type(&**bounded_ty)); try!(self.print_bounds(":", bounds)); } &hir::WherePredicate::RegionPredicate(hir::WhereRegionPredicate{ref lifetime, ref bounds, ..}) => { try!(self.print_lifetime(lifetime)); try!(word(&mut self.s, ":")); for (i, bound) in bounds.iter().enumerate() { try!(self.print_lifetime(bound)); if i != 0 { try!(word(&mut self.s, ":")); } } } &hir::WherePredicate::EqPredicate(hir::WhereEqPredicate{ref path, ref ty, ..}) => { try!(self.print_path(path, false, 0)); try!(space(&mut self.s)); try!(self.word_space("=")); try!(self.print_type(&**ty)); } } } Ok(()) } pub fn print_view_path(&mut self, vp: &hir::ViewPath) -> io::Result<()> { match vp.node { hir::ViewPathSimple(name, ref path) => { try!(self.print_path(path, false, 0)); if path.segments.last().unwrap().identifier.name != name { try!(space(&mut self.s)); try!(self.word_space("as")); try!(self.print_name(name)); } Ok(()) } hir::ViewPathGlob(ref path) => { try!(self.print_path(path, false, 0)); word(&mut self.s, "::*") } hir::ViewPathList(ref path, ref segments) => { if path.segments.is_empty() { try!(word(&mut self.s, "{")); } else { try!(self.print_path(path, false, 0)); try!(word(&mut self.s, "::{")); } try!(self.commasep(Inconsistent, &segments[..], |s, w| { match w.node { hir::PathListIdent { name, .. } => { s.print_name(name) } hir::PathListMod { .. } => { word(&mut s.s, "self") } } })); word(&mut self.s, "}") } } } pub fn print_mutability(&mut self, mutbl: hir::Mutability) -> io::Result<()> { match mutbl { hir::MutMutable => self.word_nbsp("mut"), hir::MutImmutable => Ok(()), } } pub fn print_mt(&mut self, mt: &hir::MutTy) -> io::Result<()> { try!(self.print_mutability(mt.mutbl)); self.print_type(&*mt.ty) } pub fn print_arg(&mut self, input: &hir::Arg) -> io::Result<()> { try!(self.ibox(indent_unit)); match input.ty.node { hir::TyInfer => try!(self.print_pat(&*input.pat)), _ => { match input.pat.node { hir::PatIdent(_, ref path1, _) if path1.node.name == parse::token::special_idents::invalid.name => { // Do nothing. } _ => { try!(self.print_pat(&*input.pat)); try!(word(&mut self.s, ":")); try!(space(&mut self.s)); } } try!(self.print_type(&*input.ty)); } } self.end() } pub fn print_fn_output(&mut self, decl: &hir::FnDecl) -> io::Result<()> { if let hir::DefaultReturn(..) = decl.output { return Ok(()); } try!(self.space_if_not_bol()); try!(self.ibox(indent_unit)); try!(self.word_space("->")); match decl.output { hir::NoReturn(_) => try!(self.word_nbsp("!")), hir::DefaultReturn(..) => unreachable!(), hir::Return(ref ty) => try!(self.print_type(&**ty)), } try!(self.end()); match decl.output { hir::Return(ref output) => self.maybe_print_comment(output.span.lo), _ => Ok(()), } } pub fn print_ty_fn(&mut self, abi: abi::Abi, unsafety: hir::Unsafety, decl: &hir::FnDecl, name: Option, generics: &hir::Generics, opt_explicit_self: Option<&hir::ExplicitSelf_>) -> io::Result<()> { try!(self.ibox(indent_unit)); if !generics.lifetimes.is_empty() || !generics.ty_params.is_empty() { try!(word(&mut self.s, "for")); try!(self.print_generics(generics)); } let generics = hir::Generics { lifetimes: hir::HirVec::new(), ty_params: hir::HirVec::new(), where_clause: hir::WhereClause { id: ast::DUMMY_NODE_ID, predicates: hir::HirVec::new(), }, }; try!(self.print_fn(decl, unsafety, hir::Constness::NotConst, abi, name, &generics, opt_explicit_self, hir::Inherited)); self.end() } pub fn maybe_print_trailing_comment(&mut self, span: codemap::Span, next_pos: Option) -> io::Result<()> { let cm = match self.cm { Some(cm) => cm, _ => return Ok(()), }; match self.next_comment() { Some(ref cmnt) => { if (*cmnt).style != comments::Trailing { return Ok(()); } let span_line = cm.lookup_char_pos(span.hi); let comment_line = cm.lookup_char_pos((*cmnt).pos); let mut next = (*cmnt).pos + BytePos(1); match next_pos { None => (), Some(p) => next = p, } if span.hi < (*cmnt).pos && (*cmnt).pos < next && span_line.line == comment_line.line { try!(self.print_comment(cmnt)); self.cur_cmnt_and_lit.cur_cmnt += 1; } } _ => (), } Ok(()) } pub fn print_remaining_comments(&mut self) -> io::Result<()> { // If there aren't any remaining comments, then we need to manually // make sure there is a line break at the end. if self.next_comment().is_none() { try!(hardbreak(&mut self.s)); } loop { match self.next_comment() { Some(ref cmnt) => { try!(self.print_comment(cmnt)); self.cur_cmnt_and_lit.cur_cmnt += 1; } _ => break, } } Ok(()) } pub fn print_opt_abi_and_extern_if_nondefault(&mut self, opt_abi: Option) -> io::Result<()> { match opt_abi { Some(abi::Rust) => Ok(()), Some(abi) => { try!(self.word_nbsp("extern")); self.word_nbsp(&abi.to_string()) } None => Ok(()), } } pub fn print_extern_opt_abi(&mut self, opt_abi: Option) -> io::Result<()> { match opt_abi { Some(abi) => { try!(self.word_nbsp("extern")); self.word_nbsp(&abi.to_string()) } None => Ok(()), } } pub fn print_fn_header_info(&mut self, unsafety: hir::Unsafety, constness: hir::Constness, abi: abi::Abi, vis: hir::Visibility) -> io::Result<()> { try!(word(&mut self.s, &visibility_qualified(vis, ""))); try!(self.print_unsafety(unsafety)); match constness { hir::Constness::NotConst => {} hir::Constness::Const => try!(self.word_nbsp("const")), } if abi != abi::Rust { try!(self.word_nbsp("extern")); try!(self.word_nbsp(&abi.to_string())); } word(&mut self.s, "fn") } pub fn print_unsafety(&mut self, s: hir::Unsafety) -> io::Result<()> { match s { hir::Unsafety::Normal => Ok(()), hir::Unsafety::Unsafe => self.word_nbsp("unsafe"), } } } // Dup'ed from parse::classify, but adapted for the HIR. /// Does this expression require a semicolon to be treated /// as a statement? The negation of this: 'can this expression /// be used as a statement without a semicolon' -- is used /// as an early-bail-out in the parser so that, for instance, /// if true {...} else {...} /// |x| 5 /// isn't parsed as (if true {...} else {...} | x) | 5 fn expr_requires_semi_to_be_stmt(e: &hir::Expr) -> bool { match e.node { hir::ExprIf(..) | hir::ExprMatch(..) | hir::ExprBlock(_) | hir::ExprWhile(..) | hir::ExprLoop(..) => false, _ => true, } } /// this statement requires a semicolon after it. /// note that in one case (stmt_semi), we've already /// seen the semicolon, and thus don't need another. fn stmt_ends_with_semi(stmt: &hir::Stmt_) -> bool { match *stmt { hir::StmtDecl(ref d, _) => { match d.node { hir::DeclLocal(_) => true, hir::DeclItem(_) => false, } } hir::StmtExpr(ref e, _) => { expr_requires_semi_to_be_stmt(&**e) } hir::StmtSemi(..) => { false } } }