| // 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 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, 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<Vec<comments::Comment>>, |
| literals: Option<Vec<comments::Literal>>, |
| cur_cmnt_and_lit: ast_pp::CurrentCommentAndLiteral, |
| boxes: Vec<pp::Breaks>, |
| 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<pp::Breaks> { |
| &mut self.boxes |
| } |
| |
| fn comments(&mut self) -> &mut Option<Vec<comments::Comment>> { |
| &mut self.comments |
| } |
| |
| fn cur_cmnt_and_lit(&mut self) -> &mut ast_pp::CurrentCommentAndLiteral { |
| &mut self.cur_cmnt_and_lit |
| } |
| |
| fn literals(&self) -> &Option<Vec<comments::Literal>> { |
| &self.literals |
| } |
| } |
| |
| pub fn rust_printer<'a>(writer: Box<Write + 'a>, 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<Write + 'a>, |
| 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<Write + 'a>, |
| 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<Write + 'a>, |
| 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<Write + 'a>, |
| ann: &'a PpAnn, |
| comments: Option<Vec<comments::Comment>>, |
| literals: Option<Vec<comments::Literal>>, |
| 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: 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<T, F, G>(&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<hir::Expr>]) -> 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<hir::Lifetime>) -> 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<hir::Expr>]) -> 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<hir::Expr>]) -> 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<P<hir::Expr>>) |
| -> 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<hir::Expr>]) -> 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<hir::Expr>]) -> io::Result<()> { |
| try!(self.print_expr_maybe_paren(func)); |
| self.print_call_post(args) |
| } |
| |
| fn print_expr_method_call(&mut self, |
| name: Spanned<ast::Name>, |
| tys: &[P<hir::Ty>], |
| args: &[P<hir::Expr>]) |
| -> 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<bool> { |
| 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<ast::Name>, |
| 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<ast::Name>, |
| 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<BytePos>) |
| -> 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<abi::Abi>) |
| -> 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<abi::Abi>) -> 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 |
| } |
| } |
| } |
