| // 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::Abi; |
| use syntax::ast; |
| use syntax::codemap::{CodeMap, Spanned}; |
| use syntax::parse::token::{self, BinOpToken}; |
| use syntax::parse::lexer::comments; |
| 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 syntax::symbol::keywords; |
| use syntax_pos::{self, BytePos}; |
| use errors; |
| |
| use hir; |
| use hir::{Crate, PatKind, RegionTyParamBound, SelfKind, 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. |
| |
| s.print_mod(&krate.module, &krate.attrs)?; |
| 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, |
| generics: &hir::Generics) |
| -> String { |
| to_string(|s| { |
| s.head("")?; |
| s.print_fn(decl, |
| unsafety, |
| constness, |
| Abi::Rust, |
| Some(name), |
| generics, |
| &hir::Inherited)?; |
| 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 } |
| s.cbox(indent_unit)?; |
| // head-ibox, will be closed by print-block after { |
| s.ibox(0)?; |
| s.print_block(blk) |
| }) |
| } |
| |
| 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, false)) |
| } |
| |
| pub fn visibility_qualified(vis: &hir::Visibility, s: &str) -> String { |
| match *vis { |
| hir::Public => format!("pub {}", s), |
| hir::Visibility::Crate => format!("pub(crate) {}", s), |
| hir::Visibility::Restricted { ref path, .. } => format!("pub({}) {}", path, 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<()> { |
| word(&mut self.s, w)?; |
| self.nbsp() |
| } |
| |
| pub fn head(&mut self, w: &str) -> io::Result<()> { |
| // outer-box is consistent |
| self.cbox(indent_unit)?; |
| // head-box is inconsistent |
| self.ibox(w.len() + 1)?; |
| // keyword that starts the head |
| if !w.is_empty() { |
| self.word_nbsp(w)?; |
| } |
| Ok(()) |
| } |
| |
| pub fn bopen(&mut self) -> io::Result<()> { |
| word(&mut self.s, "{")?; |
| self.end() // close the head-box |
| } |
| |
| pub fn bclose_(&mut self, span: syntax_pos::Span, indented: usize) -> io::Result<()> { |
| self.bclose_maybe_open(span, indented, true) |
| } |
| pub fn bclose_maybe_open(&mut self, |
| span: syntax_pos::Span, |
| indented: usize, |
| close_box: bool) |
| -> io::Result<()> { |
| self.maybe_print_comment(span.hi)?; |
| self.break_offset_if_not_bol(1, -(indented as isize))?; |
| word(&mut self.s, "}")?; |
| if close_box { |
| self.end()?; // close the outer-box |
| } |
| Ok(()) |
| } |
| pub fn bclose(&mut self, span: syntax_pos::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() { |
| 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<()> { |
| word(&mut self.s, "/*")?; |
| space(&mut self.s)?; |
| word(&mut self.s, &text[..])?; |
| 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) -> syntax_pos::Span |
| { |
| self.rbox(0, b)?; |
| let len = elts.len(); |
| let mut i = 0; |
| for elt in elts { |
| self.maybe_print_comment(get_span(elt).hi)?; |
| op(self, elt)?; |
| i += 1; |
| if i < len { |
| word(&mut self.s, ",")?; |
| self.maybe_print_trailing_comment(get_span(elt), Some(get_span(&elts[i]).hi))?; |
| 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<()> { |
| self.print_inner_attributes(attrs)?; |
| for item_id in &_mod.item_ids { |
| self.print_item_id(item_id)?; |
| } |
| Ok(()) |
| } |
| |
| pub fn print_foreign_mod(&mut self, |
| nmod: &hir::ForeignMod, |
| attrs: &[ast::Attribute]) |
| -> io::Result<()> { |
| self.print_inner_attributes(attrs)?; |
| for item in &nmod.items { |
| self.print_foreign_item(item)?; |
| } |
| Ok(()) |
| } |
| |
| pub fn print_opt_lifetime(&mut self, lifetime: &Option<hir::Lifetime>) -> io::Result<()> { |
| if let Some(l) = *lifetime { |
| self.print_lifetime(&l)?; |
| self.nbsp()?; |
| } |
| Ok(()) |
| } |
| |
| pub fn print_type(&mut self, ty: &hir::Ty) -> io::Result<()> { |
| self.maybe_print_comment(ty.span.lo)?; |
| self.ibox(0)?; |
| match ty.node { |
| hir::TySlice(ref ty) => { |
| word(&mut self.s, "[")?; |
| self.print_type(&ty)?; |
| word(&mut self.s, "]")?; |
| } |
| hir::TyPtr(ref mt) => { |
| word(&mut self.s, "*")?; |
| match mt.mutbl { |
| hir::MutMutable => self.word_nbsp("mut")?, |
| hir::MutImmutable => self.word_nbsp("const")?, |
| } |
| self.print_type(&mt.ty)?; |
| } |
| hir::TyRptr(ref lifetime, ref mt) => { |
| word(&mut self.s, "&")?; |
| self.print_opt_lifetime(lifetime)?; |
| self.print_mt(mt)?; |
| } |
| hir::TyNever => { |
| word(&mut self.s, "!")?; |
| }, |
| hir::TyTup(ref elts) => { |
| self.popen()?; |
| self.commasep(Inconsistent, &elts[..], |s, ty| s.print_type(&ty))?; |
| if elts.len() == 1 { |
| word(&mut self.s, ",")?; |
| } |
| 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(), |
| }, |
| span: syntax_pos::DUMMY_SP, |
| }; |
| self.print_ty_fn(f.abi, f.unsafety, &f.decl, None, &generics)?; |
| } |
| hir::TyPath(None, ref path) => { |
| self.print_path(path, false, 0)?; |
| } |
| hir::TyPath(Some(ref qself), ref path) => { |
| self.print_qpath(path, qself, false)? |
| } |
| hir::TyObjectSum(ref ty, ref bounds) => { |
| self.print_type(&ty)?; |
| self.print_bounds("+", &bounds[..])?; |
| } |
| hir::TyPolyTraitRef(ref bounds) => { |
| self.print_bounds("", &bounds[..])?; |
| } |
| hir::TyImplTrait(ref bounds) => { |
| self.print_bounds("impl ", &bounds[..])?; |
| } |
| hir::TyArray(ref ty, ref v) => { |
| word(&mut self.s, "[")?; |
| self.print_type(&ty)?; |
| word(&mut self.s, "; ")?; |
| self.print_expr(&v)?; |
| word(&mut self.s, "]")?; |
| } |
| hir::TyTypeof(ref e) => { |
| word(&mut self.s, "typeof(")?; |
| self.print_expr(&e)?; |
| word(&mut self.s, ")")?; |
| } |
| hir::TyInfer => { |
| word(&mut self.s, "_")?; |
| } |
| } |
| self.end() |
| } |
| |
| pub fn print_foreign_item(&mut self, item: &hir::ForeignItem) -> io::Result<()> { |
| self.hardbreak_if_not_bol()?; |
| self.maybe_print_comment(item.span.lo)?; |
| self.print_outer_attributes(&item.attrs)?; |
| match item.node { |
| hir::ForeignItemFn(ref decl, ref generics) => { |
| self.head("")?; |
| self.print_fn(decl, |
| hir::Unsafety::Normal, |
| hir::Constness::NotConst, |
| Abi::Rust, |
| Some(item.name), |
| generics, |
| &item.vis)?; |
| self.end()?; // end head-ibox |
| word(&mut self.s, ";")?; |
| self.end() // end the outer fn box |
| } |
| hir::ForeignItemStatic(ref t, m) => { |
| self.head(&visibility_qualified(&item.vis, "static"))?; |
| if m { |
| self.word_space("mut")?; |
| } |
| self.print_name(item.name)?; |
| self.word_space(":")?; |
| self.print_type(&t)?; |
| word(&mut self.s, ";")?; |
| 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<()> { |
| word(&mut self.s, &visibility_qualified(vis, ""))?; |
| self.word_space("const")?; |
| self.print_name(name)?; |
| self.word_space(":")?; |
| self.print_type(ty)?; |
| if let Some(expr) = default { |
| space(&mut self.s)?; |
| self.word_space("=")?; |
| 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<()> { |
| self.word_space("type")?; |
| self.print_name(name)?; |
| if let Some(bounds) = bounds { |
| self.print_bounds(":", bounds)?; |
| } |
| if let Some(ty) = ty { |
| space(&mut self.s)?; |
| self.word_space("=")?; |
| 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<()> { |
| self.hardbreak_if_not_bol()?; |
| self.maybe_print_comment(item.span.lo)?; |
| self.print_outer_attributes(&item.attrs)?; |
| self.ann.pre(self, NodeItem(item))?; |
| match item.node { |
| hir::ItemExternCrate(ref optional_path) => { |
| self.head(&visibility_qualified(&item.vis, "extern crate"))?; |
| if let Some(p) = *optional_path { |
| let val = p.as_str(); |
| if val.contains("-") { |
| self.print_string(&val, ast::StrStyle::Cooked)?; |
| } else { |
| self.print_name(p)?; |
| } |
| space(&mut self.s)?; |
| word(&mut self.s, "as")?; |
| space(&mut self.s)?; |
| } |
| self.print_name(item.name)?; |
| word(&mut self.s, ";")?; |
| self.end()?; // end inner head-block |
| self.end()?; // end outer head-block |
| } |
| hir::ItemUse(ref vp) => { |
| self.head(&visibility_qualified(&item.vis, "use"))?; |
| self.print_view_path(&vp)?; |
| word(&mut self.s, ";")?; |
| self.end()?; // end inner head-block |
| self.end()?; // end outer head-block |
| } |
| hir::ItemStatic(ref ty, m, ref expr) => { |
| self.head(&visibility_qualified(&item.vis, "static"))?; |
| if m == hir::MutMutable { |
| self.word_space("mut")?; |
| } |
| self.print_name(item.name)?; |
| self.word_space(":")?; |
| self.print_type(&ty)?; |
| space(&mut self.s)?; |
| self.end()?; // end the head-ibox |
| |
| self.word_space("=")?; |
| self.print_expr(&expr)?; |
| word(&mut self.s, ";")?; |
| self.end()?; // end the outer cbox |
| } |
| hir::ItemConst(ref ty, ref expr) => { |
| self.head(&visibility_qualified(&item.vis, "const"))?; |
| self.print_name(item.name)?; |
| self.word_space(":")?; |
| self.print_type(&ty)?; |
| space(&mut self.s)?; |
| self.end()?; // end the head-ibox |
| |
| self.word_space("=")?; |
| self.print_expr(&expr)?; |
| word(&mut self.s, ";")?; |
| self.end()?; // end the outer cbox |
| } |
| hir::ItemFn(ref decl, unsafety, constness, abi, ref typarams, ref body) => { |
| self.head("")?; |
| self.print_fn(decl, |
| unsafety, |
| constness, |
| abi, |
| Some(item.name), |
| typarams, |
| &item.vis)?; |
| word(&mut self.s, " ")?; |
| self.end()?; // need to close a box |
| self.end()?; // need to close a box |
| self.print_expr(&body)?; |
| } |
| hir::ItemMod(ref _mod) => { |
| self.head(&visibility_qualified(&item.vis, "mod"))?; |
| self.print_name(item.name)?; |
| self.nbsp()?; |
| self.bopen()?; |
| self.print_mod(_mod, &item.attrs)?; |
| self.bclose(item.span)?; |
| } |
| hir::ItemForeignMod(ref nmod) => { |
| self.head("extern")?; |
| self.word_nbsp(&nmod.abi.to_string())?; |
| self.bopen()?; |
| self.print_foreign_mod(nmod, &item.attrs)?; |
| self.bclose(item.span)?; |
| } |
| hir::ItemTy(ref ty, ref params) => { |
| self.ibox(indent_unit)?; |
| self.ibox(0)?; |
| self.word_nbsp(&visibility_qualified(&item.vis, "type"))?; |
| self.print_name(item.name)?; |
| self.print_generics(params)?; |
| self.end()?; // end the inner ibox |
| |
| self.print_where_clause(¶ms.where_clause)?; |
| space(&mut self.s)?; |
| self.word_space("=")?; |
| self.print_type(&ty)?; |
| word(&mut self.s, ";")?; |
| self.end()?; // end the outer ibox |
| } |
| hir::ItemEnum(ref enum_definition, ref params) => { |
| self.print_enum_def(enum_definition, params, item.name, item.span, &item.vis)?; |
| } |
| hir::ItemStruct(ref struct_def, ref generics) => { |
| self.head(&visibility_qualified(&item.vis, "struct"))?; |
| self.print_struct(struct_def, generics, item.name, item.span, true)?; |
| } |
| hir::ItemUnion(ref struct_def, ref generics) => { |
| self.head(&visibility_qualified(&item.vis, "union"))?; |
| self.print_struct(struct_def, generics, item.name, item.span, true)?; |
| } |
| hir::ItemDefaultImpl(unsafety, ref trait_ref) => { |
| self.head("")?; |
| self.print_visibility(&item.vis)?; |
| self.print_unsafety(unsafety)?; |
| self.word_nbsp("impl")?; |
| self.print_trait_ref(trait_ref)?; |
| space(&mut self.s)?; |
| self.word_space("for")?; |
| self.word_space("..")?; |
| self.bopen()?; |
| self.bclose(item.span)?; |
| } |
| hir::ItemImpl(unsafety, |
| polarity, |
| ref generics, |
| ref opt_trait, |
| ref ty, |
| ref impl_items) => { |
| self.head("")?; |
| self.print_visibility(&item.vis)?; |
| self.print_unsafety(unsafety)?; |
| self.word_nbsp("impl")?; |
| |
| if generics.is_parameterized() { |
| self.print_generics(generics)?; |
| space(&mut self.s)?; |
| } |
| |
| match polarity { |
| hir::ImplPolarity::Negative => { |
| word(&mut self.s, "!")?; |
| } |
| _ => {} |
| } |
| |
| match opt_trait { |
| &Some(ref t) => { |
| self.print_trait_ref(t)?; |
| space(&mut self.s)?; |
| self.word_space("for")?; |
| } |
| &None => {} |
| } |
| |
| self.print_type(&ty)?; |
| self.print_where_clause(&generics.where_clause)?; |
| |
| space(&mut self.s)?; |
| self.bopen()?; |
| self.print_inner_attributes(&item.attrs)?; |
| for impl_item in impl_items { |
| self.print_impl_item_ref(impl_item)?; |
| } |
| self.bclose(item.span)?; |
| } |
| hir::ItemTrait(unsafety, ref generics, ref bounds, ref trait_items) => { |
| self.head("")?; |
| self.print_visibility(&item.vis)?; |
| self.print_unsafety(unsafety)?; |
| self.word_nbsp("trait")?; |
| self.print_name(item.name)?; |
| 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 { |
| space(&mut self.s)?; |
| self.word_space("for ?")?; |
| self.print_trait_ref(&ptr.trait_ref)?; |
| } else { |
| real_bounds.push(b.clone()); |
| } |
| } |
| self.print_bounds(":", &real_bounds[..])?; |
| self.print_where_clause(&generics.where_clause)?; |
| word(&mut self.s, " ")?; |
| self.bopen()?; |
| for trait_item in trait_items { |
| self.print_trait_item(trait_item)?; |
| } |
| 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() { |
| word(&mut self.s, "for<")?; |
| let mut comma = false; |
| for lifetime_def in lifetimes { |
| if comma { |
| self.word_space(",")? |
| } |
| self.print_lifetime_def(lifetime_def)?; |
| comma = true; |
| } |
| word(&mut self.s, ">")?; |
| } |
| Ok(()) |
| } |
| |
| fn print_poly_trait_ref(&mut self, t: &hir::PolyTraitRef) -> io::Result<()> { |
| 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: syntax_pos::Span, |
| visibility: &hir::Visibility) |
| -> io::Result<()> { |
| self.head(&visibility_qualified(visibility, "enum"))?; |
| self.print_name(name)?; |
| self.print_generics(generics)?; |
| self.print_where_clause(&generics.where_clause)?; |
| space(&mut self.s)?; |
| self.print_variants(&enum_definition.variants, span) |
| } |
| |
| pub fn print_variants(&mut self, |
| variants: &[hir::Variant], |
| span: syntax_pos::Span) |
| -> io::Result<()> { |
| self.bopen()?; |
| for v in variants { |
| self.space_if_not_bol()?; |
| self.maybe_print_comment(v.span.lo)?; |
| self.print_outer_attributes(&v.node.attrs)?; |
| self.ibox(indent_unit)?; |
| self.print_variant(v)?; |
| word(&mut self.s, ",")?; |
| self.end()?; |
| 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::Visibility::Crate => self.word_nbsp("pub(crate)"), |
| hir::Visibility::Restricted { ref path, .. } => |
| self.word_nbsp(&format!("pub({})", path)), |
| hir::Inherited => Ok(()), |
| } |
| } |
| |
| pub fn print_struct(&mut self, |
| struct_def: &hir::VariantData, |
| generics: &hir::Generics, |
| name: ast::Name, |
| span: syntax_pos::Span, |
| print_finalizer: bool) |
| -> io::Result<()> { |
| self.print_name(name)?; |
| self.print_generics(generics)?; |
| if !struct_def.is_struct() { |
| if struct_def.is_tuple() { |
| self.popen()?; |
| self.commasep(Inconsistent, struct_def.fields(), |s, field| { |
| s.maybe_print_comment(field.span.lo)?; |
| s.print_outer_attributes(&field.attrs)?; |
| s.print_visibility(&field.vis)?; |
| s.print_type(&field.ty) |
| })?; |
| self.pclose()?; |
| } |
| self.print_where_clause(&generics.where_clause)?; |
| if print_finalizer { |
| word(&mut self.s, ";")?; |
| } |
| self.end()?; |
| self.end() // close the outer-box |
| } else { |
| self.print_where_clause(&generics.where_clause)?; |
| self.nbsp()?; |
| self.bopen()?; |
| self.hardbreak_if_not_bol()?; |
| |
| for field in struct_def.fields() { |
| self.hardbreak_if_not_bol()?; |
| self.maybe_print_comment(field.span.lo)?; |
| self.print_outer_attributes(&field.attrs)?; |
| self.print_visibility(&field.vis)?; |
| self.print_name(field.name)?; |
| self.word_nbsp(":")?; |
| self.print_type(&field.ty)?; |
| word(&mut self.s, ",")?; |
| } |
| |
| self.bclose(span) |
| } |
| } |
| |
| pub fn print_variant(&mut self, v: &hir::Variant) -> io::Result<()> { |
| self.head("")?; |
| let generics = hir::Generics::empty(); |
| self.print_struct(&v.node.data, &generics, v.node.name, v.span, false)?; |
| match v.node.disr_expr { |
| Some(ref d) => { |
| space(&mut self.s)?; |
| 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, |
| vis) |
| } |
| |
| pub fn print_trait_item(&mut self, ti: &hir::TraitItem) -> io::Result<()> { |
| self.ann.pre(self, NodeSubItem(ti.id))?; |
| self.hardbreak_if_not_bol()?; |
| self.maybe_print_comment(ti.span.lo)?; |
| self.print_outer_attributes(&ti.attrs)?; |
| match ti.node { |
| hir::ConstTraitItem(ref ty, ref default) => { |
| 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() { |
| self.head("")?; |
| } |
| self.print_method_sig(ti.name, sig, &hir::Inherited)?; |
| if let Some(ref body) = *body { |
| self.nbsp()?; |
| self.end()?; // need to close a box |
| self.end()?; // need to close a box |
| self.print_expr(body)?; |
| } else { |
| word(&mut self.s, ";")?; |
| } |
| } |
| hir::TypeTraitItem(ref bounds, ref default) => { |
| 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_ref(&mut self, item_ref: &hir::ImplItemRef) -> io::Result<()> { |
| if let Some(krate) = self.krate { |
| // skip nested items if krate context was not provided |
| let item = &krate.impl_item(item_ref.id); |
| self.print_impl_item(item) |
| } else { |
| Ok(()) |
| } |
| } |
| |
| pub fn print_impl_item(&mut self, ii: &hir::ImplItem) -> io::Result<()> { |
| self.ann.pre(self, NodeSubItem(ii.id))?; |
| self.hardbreak_if_not_bol()?; |
| self.maybe_print_comment(ii.span.lo)?; |
| self.print_outer_attributes(&ii.attrs)?; |
| |
| match ii.defaultness { |
| hir::Defaultness::Default { .. } => self.word_nbsp("default")?, |
| hir::Defaultness::Final => (), |
| } |
| |
| match ii.node { |
| hir::ImplItemKind::Const(ref ty, ref expr) => { |
| self.print_associated_const(ii.name, &ty, Some(&expr), &ii.vis)?; |
| } |
| hir::ImplItemKind::Method(ref sig, ref body) => { |
| self.head("")?; |
| self.print_method_sig(ii.name, sig, &ii.vis)?; |
| self.nbsp()?; |
| self.end()?; // need to close a box |
| self.end()?; // need to close a box |
| self.print_expr(body)?; |
| } |
| hir::ImplItemKind::Type(ref ty) => { |
| 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<()> { |
| self.maybe_print_comment(st.span.lo)?; |
| match st.node { |
| hir::StmtDecl(ref decl, _) => { |
| self.print_decl(&decl)?; |
| } |
| hir::StmtExpr(ref expr, _) => { |
| self.space_if_not_bol()?; |
| self.print_expr(&expr)?; |
| } |
| hir::StmtSemi(ref expr, _) => { |
| self.space_if_not_bol()?; |
| self.print_expr(&expr)?; |
| word(&mut self.s, ";")?; |
| } |
| } |
| if stmt_ends_with_semi(&st.node) { |
| 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(..) => self.word_space("unsafe")?, |
| hir::PushUnsafeBlock(..) => self.word_space("push_unsafe")?, |
| hir::PopUnsafeBlock(..) => self.word_space("pop_unsafe")?, |
| hir::PushUnstableBlock => self.word_space("push_unstable")?, |
| hir::PopUnstableBlock => self.word_space("pop_unstable")?, |
| hir::DefaultBlock => (), |
| } |
| self.maybe_print_comment(blk.span.lo)?; |
| self.ann.pre(self, NodeBlock(blk))?; |
| self.bopen()?; |
| |
| self.print_inner_attributes(attrs)?; |
| |
| for st in &blk.stmts { |
| self.print_stmt(st)?; |
| } |
| match blk.expr { |
| Some(ref expr) => { |
| self.space_if_not_bol()?; |
| self.print_expr(&expr)?; |
| self.maybe_print_trailing_comment(expr.span, Some(blk.span.hi))?; |
| } |
| _ => (), |
| } |
| 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) => { |
| self.cbox(indent_unit - 1)?; |
| self.ibox(0)?; |
| word(&mut self.s, " else if ")?; |
| self.print_expr(&i)?; |
| space(&mut self.s)?; |
| self.print_block(&then)?; |
| self.print_else(e.as_ref().map(|e| &**e)) |
| } |
| // "final else" |
| hir::ExprBlock(ref b) => { |
| self.cbox(indent_unit - 1)?; |
| self.ibox(0)?; |
| 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<()> { |
| self.head("if")?; |
| self.print_expr(test)?; |
| space(&mut self.s)?; |
| 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<()> { |
| self.head("if let")?; |
| self.print_pat(pat)?; |
| space(&mut self.s)?; |
| self.word_space("=")?; |
| self.print_expr(expr)?; |
| space(&mut self.s)?; |
| self.print_block(blk)?; |
| self.print_else(elseopt) |
| } |
| |
| |
| fn print_call_post(&mut self, args: &[P<hir::Expr>]) -> io::Result<()> { |
| self.popen()?; |
| 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 { |
| self.popen()?; |
| } |
| self.print_expr(expr)?; |
| if needs_par { |
| self.pclose()?; |
| } |
| Ok(()) |
| } |
| |
| fn print_expr_vec(&mut self, exprs: &[P<hir::Expr>]) -> io::Result<()> { |
| self.ibox(indent_unit)?; |
| word(&mut self.s, "[")?; |
| self.commasep_exprs(Inconsistent, &exprs[..])?; |
| word(&mut self.s, "]")?; |
| self.end() |
| } |
| |
| fn print_expr_repeat(&mut self, element: &hir::Expr, count: &hir::Expr) -> io::Result<()> { |
| self.ibox(indent_unit)?; |
| word(&mut self.s, "[")?; |
| self.print_expr(element)?; |
| self.word_space(";")?; |
| self.print_expr(count)?; |
| 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<()> { |
| self.print_path(path, true, 0)?; |
| word(&mut self.s, "{")?; |
| self.commasep_cmnt(Consistent, |
| &fields[..], |
| |s, field| { |
| s.ibox(indent_unit)?; |
| if !field.is_shorthand { |
| s.print_name(field.name.node)?; |
| s.word_space(":")?; |
| } |
| s.print_expr(&field.expr)?; |
| s.end() |
| }, |
| |f| f.span)?; |
| match *wth { |
| Some(ref expr) => { |
| self.ibox(indent_unit)?; |
| if !fields.is_empty() { |
| word(&mut self.s, ",")?; |
| space(&mut self.s)?; |
| } |
| word(&mut self.s, "..")?; |
| self.print_expr(&expr)?; |
| self.end()?; |
| } |
| _ => if !fields.is_empty() { |
| word(&mut self.s, ",")? |
| }, |
| } |
| word(&mut self.s, "}")?; |
| Ok(()) |
| } |
| |
| fn print_expr_tup(&mut self, exprs: &[P<hir::Expr>]) -> io::Result<()> { |
| self.popen()?; |
| self.commasep_exprs(Inconsistent, &exprs[..])?; |
| if exprs.len() == 1 { |
| word(&mut self.s, ",")?; |
| } |
| self.pclose() |
| } |
| |
| fn print_expr_call(&mut self, func: &hir::Expr, args: &[P<hir::Expr>]) -> io::Result<()> { |
| 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..]; |
| self.print_expr(&args[0])?; |
| word(&mut self.s, ".")?; |
| self.print_name(name.node)?; |
| if !tys.is_empty() { |
| word(&mut self.s, "::<")?; |
| self.commasep(Inconsistent, tys, |s, ty| s.print_type(&ty))?; |
| 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<()> { |
| self.print_expr(lhs)?; |
| space(&mut self.s)?; |
| self.word_space(op.node.as_str())?; |
| self.print_expr(rhs) |
| } |
| |
| fn print_expr_unary(&mut self, op: hir::UnOp, expr: &hir::Expr) -> io::Result<()> { |
| word(&mut self.s, op.as_str())?; |
| self.print_expr_maybe_paren(expr) |
| } |
| |
| fn print_expr_addr_of(&mut self, |
| mutability: hir::Mutability, |
| expr: &hir::Expr) |
| -> io::Result<()> { |
| word(&mut self.s, "&")?; |
| self.print_mutability(mutability)?; |
| self.print_expr_maybe_paren(expr) |
| } |
| |
| pub fn print_expr(&mut self, expr: &hir::Expr) -> io::Result<()> { |
| self.maybe_print_comment(expr.span.lo)?; |
| self.ibox(indent_unit)?; |
| self.ann.pre(self, NodeExpr(expr))?; |
| match expr.node { |
| hir::ExprBox(ref expr) => { |
| self.word_space("box")?; |
| self.print_expr(expr)?; |
| } |
| hir::ExprArray(ref exprs) => { |
| self.print_expr_vec(&exprs[..])?; |
| } |
| hir::ExprRepeat(ref element, ref count) => { |
| self.print_expr_repeat(&element, &count)?; |
| } |
| hir::ExprStruct(ref path, ref fields, ref wth) => { |
| self.print_expr_struct(path, &fields[..], wth)?; |
| } |
| hir::ExprTup(ref exprs) => { |
| self.print_expr_tup(&exprs[..])?; |
| } |
| hir::ExprCall(ref func, ref args) => { |
| self.print_expr_call(&func, &args[..])?; |
| } |
| hir::ExprMethodCall(name, ref tys, ref args) => { |
| self.print_expr_method_call(name, &tys[..], &args[..])?; |
| } |
| hir::ExprBinary(op, ref lhs, ref rhs) => { |
| self.print_expr_binary(op, &lhs, &rhs)?; |
| } |
| hir::ExprUnary(op, ref expr) => { |
| self.print_expr_unary(op, &expr)?; |
| } |
| hir::ExprAddrOf(m, ref expr) => { |
| self.print_expr_addr_of(m, &expr)?; |
| } |
| hir::ExprLit(ref lit) => { |
| self.print_literal(&lit)?; |
| } |
| hir::ExprCast(ref expr, ref ty) => { |
| self.print_expr(&expr)?; |
| space(&mut self.s)?; |
| self.word_space("as")?; |
| self.print_type(&ty)?; |
| } |
| hir::ExprType(ref expr, ref ty) => { |
| self.print_expr(&expr)?; |
| self.word_space(":")?; |
| self.print_type(&ty)?; |
| } |
| hir::ExprIf(ref test, ref blk, ref elseopt) => { |
| self.print_if(&test, &blk, elseopt.as_ref().map(|e| &**e))?; |
| } |
| hir::ExprWhile(ref test, ref blk, opt_sp_name) => { |
| if let Some(sp_name) = opt_sp_name { |
| self.print_name(sp_name.node)?; |
| self.word_space(":")?; |
| } |
| self.head("while")?; |
| self.print_expr(&test)?; |
| space(&mut self.s)?; |
| self.print_block(&blk)?; |
| } |
| hir::ExprLoop(ref blk, opt_sp_name) => { |
| if let Some(sp_name) = opt_sp_name { |
| self.print_name(sp_name.node)?; |
| self.word_space(":")?; |
| } |
| self.head("loop")?; |
| space(&mut self.s)?; |
| self.print_block(&blk)?; |
| } |
| hir::ExprMatch(ref expr, ref arms, _) => { |
| self.cbox(indent_unit)?; |
| self.ibox(4)?; |
| self.word_nbsp("match")?; |
| self.print_expr(&expr)?; |
| space(&mut self.s)?; |
| self.bopen()?; |
| for arm in arms { |
| self.print_arm(arm)?; |
| } |
| self.bclose_(expr.span, indent_unit)?; |
| } |
| hir::ExprClosure(capture_clause, ref decl, ref body, _fn_decl_span) => { |
| self.print_capture_clause(capture_clause)?; |
| |
| self.print_fn_block_args(&decl)?; |
| space(&mut self.s)?; |
| |
| // this is a bare expression |
| self.print_expr(body)?; |
| 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. |
| self.ibox(0)?; |
| } |
| hir::ExprBlock(ref blk) => { |
| // containing cbox, will be closed by print-block at } |
| self.cbox(indent_unit)?; |
| // head-box, will be closed by print-block after { |
| self.ibox(0)?; |
| self.print_block(&blk)?; |
| } |
| hir::ExprAssign(ref lhs, ref rhs) => { |
| self.print_expr(&lhs)?; |
| space(&mut self.s)?; |
| self.word_space("=")?; |
| self.print_expr(&rhs)?; |
| } |
| hir::ExprAssignOp(op, ref lhs, ref rhs) => { |
| self.print_expr(&lhs)?; |
| space(&mut self.s)?; |
| word(&mut self.s, op.node.as_str())?; |
| self.word_space("=")?; |
| self.print_expr(&rhs)?; |
| } |
| hir::ExprField(ref expr, name) => { |
| self.print_expr(&expr)?; |
| word(&mut self.s, ".")?; |
| self.print_name(name.node)?; |
| } |
| hir::ExprTupField(ref expr, id) => { |
| self.print_expr(&expr)?; |
| word(&mut self.s, ".")?; |
| self.print_usize(id.node)?; |
| } |
| hir::ExprIndex(ref expr, ref index) => { |
| self.print_expr(&expr)?; |
| word(&mut self.s, "[")?; |
| self.print_expr(&index)?; |
| word(&mut self.s, "]")?; |
| } |
| hir::ExprPath(None, ref path) => { |
| self.print_path(path, true, 0)? |
| } |
| hir::ExprPath(Some(ref qself), ref path) => { |
| self.print_qpath(path, qself, true)? |
| } |
| hir::ExprBreak(opt_name) => { |
| word(&mut self.s, "break")?; |
| space(&mut self.s)?; |
| if let Some(name) = opt_name { |
| self.print_name(name.node)?; |
| space(&mut self.s)?; |
| } |
| } |
| hir::ExprAgain(opt_name) => { |
| word(&mut self.s, "continue")?; |
| space(&mut self.s)?; |
| if let Some(name) = opt_name { |
| self.print_name(name.node)?; |
| space(&mut self.s)? |
| } |
| } |
| hir::ExprRet(ref result) => { |
| word(&mut self.s, "return")?; |
| match *result { |
| Some(ref expr) => { |
| word(&mut self.s, " ")?; |
| self.print_expr(&expr)?; |
| } |
| _ => (), |
| } |
| } |
| hir::ExprInlineAsm(ref a, ref outputs, ref inputs) => { |
| word(&mut self.s, "asm!")?; |
| self.popen()?; |
| self.print_string(&a.asm, a.asm_str_style)?; |
| self.word_space(":")?; |
| |
| let mut out_idx = 0; |
| self.commasep(Inconsistent, &a.outputs, |s, out| { |
| let mut ch = out.constraint.chars(); |
| match ch.next() { |
| Some('=') if out.is_rw => { |
| s.print_string(&format!("+{}", ch.as_str()), |
| ast::StrStyle::Cooked)? |
| } |
| _ => s.print_string(&out.constraint, |
| ast::StrStyle::Cooked)?, |
| } |
| s.popen()?; |
| s.print_expr(&outputs[out_idx])?; |
| s.pclose()?; |
| out_idx += 1; |
| Ok(()) |
| })?; |
| space(&mut self.s)?; |
| self.word_space(":")?; |
| |
| let mut in_idx = 0; |
| self.commasep(Inconsistent, &a.inputs, |s, co| { |
| s.print_string(&co, ast::StrStyle::Cooked)?; |
| s.popen()?; |
| s.print_expr(&inputs[in_idx])?; |
| s.pclose()?; |
| in_idx += 1; |
| Ok(()) |
| })?; |
| space(&mut self.s)?; |
| self.word_space(":")?; |
| |
| self.commasep(Inconsistent, &a.clobbers, |s, co| { |
| s.print_string(&co, ast::StrStyle::Cooked)?; |
| 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() { |
| space(&mut self.s)?; |
| self.word_space(":")?; |
| self.commasep(Inconsistent, &options, |s, &co| { |
| s.print_string(co, ast::StrStyle::Cooked)?; |
| Ok(()) |
| })?; |
| } |
| |
| self.pclose()?; |
| } |
| } |
| self.ann.post(self, NodeExpr(expr))?; |
| self.end() |
| } |
| |
| pub fn print_local_decl(&mut self, loc: &hir::Local) -> io::Result<()> { |
| self.print_pat(&loc.pat)?; |
| if let Some(ref ty) = loc.ty { |
| self.word_space(":")?; |
| self.print_type(&ty)?; |
| } |
| Ok(()) |
| } |
| |
| pub fn print_decl(&mut self, decl: &hir::Decl) -> io::Result<()> { |
| self.maybe_print_comment(decl.span.lo)?; |
| match decl.node { |
| hir::DeclLocal(ref loc) => { |
| self.space_if_not_bol()?; |
| self.ibox(indent_unit)?; |
| self.word_nbsp("let")?; |
| |
| self.ibox(indent_unit)?; |
| self.print_local_decl(&loc)?; |
| self.end()?; |
| if let Some(ref init) = loc.init { |
| self.nbsp()?; |
| self.word_space("=")?; |
| 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<()> { |
| 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<()> { |
| self.print_local_decl(loc)?; |
| space(&mut self.s)?; |
| self.word_space("in")?; |
| self.print_expr(coll) |
| } |
| |
| fn print_path(&mut self, |
| path: &hir::Path, |
| colons_before_params: bool, |
| depth: usize) |
| -> io::Result<()> { |
| 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 { |
| word(&mut self.s, "::")? |
| } |
| |
| self.print_name(segment.name)?; |
| |
| 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<()> { |
| word(&mut self.s, "<")?; |
| self.print_type(&qself.ty)?; |
| if qself.position > 0 { |
| space(&mut self.s)?; |
| self.word_space("as")?; |
| let depth = path.segments.len() - qself.position; |
| self.print_path(&path, false, depth)?; |
| } |
| word(&mut self.s, ">")?; |
| word(&mut self.s, "::")?; |
| let item_segment = path.segments.last().unwrap(); |
| self.print_name(item_segment.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 { |
| word(&mut self.s, "::")? |
| } |
| |
| match *parameters { |
| hir::AngleBracketedParameters(ref data) => { |
| word(&mut self.s, "<")?; |
| |
| let mut comma = false; |
| for lifetime in &data.lifetimes { |
| if comma { |
| self.word_space(",")? |
| } |
| self.print_lifetime(lifetime)?; |
| comma = true; |
| } |
| |
| if !data.types.is_empty() { |
| if comma { |
| self.word_space(",")? |
| } |
| self.commasep(Inconsistent, &data.types, |s, ty| s.print_type(&ty))?; |
| comma = true; |
| } |
| |
| for binding in data.bindings.iter() { |
| if comma { |
| self.word_space(",")? |
| } |
| self.print_name(binding.name)?; |
| space(&mut self.s)?; |
| self.word_space("=")?; |
| self.print_type(&binding.ty)?; |
| comma = true; |
| } |
| |
| word(&mut self.s, ">")? |
| } |
| |
| hir::ParenthesizedParameters(ref data) => { |
| word(&mut self.s, "(")?; |
| self.commasep(Inconsistent, &data.inputs, |s, ty| s.print_type(&ty))?; |
| word(&mut self.s, ")")?; |
| |
| if let Some(ref ty) = data.output { |
| self.space_if_not_bol()?; |
| self.word_space("->")?; |
| self.print_type(&ty)?; |
| } |
| } |
| } |
| |
| Ok(()) |
| } |
| |
| pub fn print_pat(&mut self, pat: &hir::Pat) -> io::Result<()> { |
| self.maybe_print_comment(pat.span.lo)?; |
| self.ann.pre(self, NodePat(pat))?; |
| // Pat isn't normalized, but the beauty of it |
| // is that it doesn't matter |
| match pat.node { |
| PatKind::Wild => word(&mut self.s, "_")?, |
| PatKind::Binding(binding_mode, ref path1, ref sub) => { |
| match binding_mode { |
| hir::BindByRef(mutbl) => { |
| self.word_nbsp("ref")?; |
| self.print_mutability(mutbl)?; |
| } |
| hir::BindByValue(hir::MutImmutable) => {} |
| hir::BindByValue(hir::MutMutable) => { |
| self.word_nbsp("mut")?; |
| } |
| } |
| self.print_name(path1.node)?; |
| if let Some(ref p) = *sub { |
| word(&mut self.s, "@")?; |
| self.print_pat(&p)?; |
| } |
| } |
| PatKind::TupleStruct(ref path, ref elts, ddpos) => { |
| self.print_path(path, true, 0)?; |
| self.popen()?; |
| if let Some(ddpos) = ddpos { |
| self.commasep(Inconsistent, &elts[..ddpos], |s, p| s.print_pat(&p))?; |
| if ddpos != 0 { |
| self.word_space(",")?; |
| } |
| word(&mut self.s, "..")?; |
| if ddpos != elts.len() { |
| word(&mut self.s, ",")?; |
| self.commasep(Inconsistent, &elts[ddpos..], |s, p| s.print_pat(&p))?; |
| } |
| } else { |
| self.commasep(Inconsistent, &elts[..], |s, p| s.print_pat(&p))?; |
| } |
| self.pclose()?; |
| } |
| PatKind::Path(None, ref path) => { |
| self.print_path(path, true, 0)?; |
| } |
| PatKind::Path(Some(ref qself), ref path) => { |
| self.print_qpath(path, qself, false)?; |
| } |
| PatKind::Struct(ref path, ref fields, etc) => { |
| self.print_path(path, true, 0)?; |
| self.nbsp()?; |
| self.word_space("{")?; |
| self.commasep_cmnt(Consistent, |
| &fields[..], |
| |s, f| { |
| s.cbox(indent_unit)?; |
| if !f.node.is_shorthand { |
| s.print_name(f.node.name)?; |
| s.word_nbsp(":")?; |
| } |
| s.print_pat(&f.node.pat)?; |
| s.end() |
| }, |
| |f| f.node.pat.span)?; |
| if etc { |
| if !fields.is_empty() { |
| self.word_space(",")?; |
| } |
| word(&mut self.s, "..")?; |
| } |
| space(&mut self.s)?; |
| word(&mut self.s, "}")?; |
| } |
| PatKind::Tuple(ref elts, ddpos) => { |
| self.popen()?; |
| if let Some(ddpos) = ddpos { |
| self.commasep(Inconsistent, &elts[..ddpos], |s, p| s.print_pat(&p))?; |
| if ddpos != 0 { |
| self.word_space(",")?; |
| } |
| word(&mut self.s, "..")?; |
| if ddpos != elts.len() { |
| word(&mut self.s, ",")?; |
| self.commasep(Inconsistent, &elts[ddpos..], |s, p| s.print_pat(&p))?; |
| } |
| } else { |
| self.commasep(Inconsistent, &elts[..], |s, p| s.print_pat(&p))?; |
| if elts.len() == 1 { |
| word(&mut self.s, ",")?; |
| } |
| } |
| self.pclose()?; |
| } |
| PatKind::Box(ref inner) => { |
| word(&mut self.s, "box ")?; |
| self.print_pat(&inner)?; |
| } |
| PatKind::Ref(ref inner, mutbl) => { |
| word(&mut self.s, "&")?; |
| if mutbl == hir::MutMutable { |
| word(&mut self.s, "mut ")?; |
| } |
| self.print_pat(&inner)?; |
| } |
| PatKind::Lit(ref e) => self.print_expr(&e)?, |
| PatKind::Range(ref begin, ref end) => { |
| self.print_expr(&begin)?; |
| space(&mut self.s)?; |
| word(&mut self.s, "...")?; |
| self.print_expr(&end)?; |
| } |
| PatKind::Slice(ref before, ref slice, ref after) => { |
| word(&mut self.s, "[")?; |
| self.commasep(Inconsistent, &before[..], |s, p| s.print_pat(&p))?; |
| if let Some(ref p) = *slice { |
| if !before.is_empty() { |
| self.word_space(",")?; |
| } |
| if p.node != PatKind::Wild { |
| self.print_pat(&p)?; |
| } |
| word(&mut self.s, "..")?; |
| if !after.is_empty() { |
| self.word_space(",")?; |
| } |
| } |
| self.commasep(Inconsistent, &after[..], |s, p| s.print_pat(&p))?; |
| 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() { |
| space(&mut self.s)?; |
| } |
| self.cbox(indent_unit)?; |
| self.ibox(0)?; |
| self.print_outer_attributes(&arm.attrs)?; |
| let mut first = true; |
| for p in &arm.pats { |
| if first { |
| first = false; |
| } else { |
| space(&mut self.s)?; |
| self.word_space("|")?; |
| } |
| self.print_pat(&p)?; |
| } |
| space(&mut self.s)?; |
| if let Some(ref e) = arm.guard { |
| self.word_space("if")?; |
| self.print_expr(&e)?; |
| space(&mut self.s)?; |
| } |
| self.word_space("=>")?; |
| |
| match arm.body.node { |
| hir::ExprBlock(ref blk) => { |
| // the block will close the pattern's ibox |
| 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 { |
| word(&mut self.s, ",")?; |
| } |
| } |
| _ => { |
| self.end()?; // close the ibox for the pattern |
| self.print_expr(&arm.body)?; |
| word(&mut self.s, ",")?; |
| } |
| } |
| self.end() // close enclosing cbox |
| } |
| |
| fn print_explicit_self(&mut self, explicit_self: &hir::ExplicitSelf) -> io::Result<()> { |
| match explicit_self.node { |
| SelfKind::Value(m) => { |
| self.print_mutability(m)?; |
| word(&mut self.s, "self") |
| } |
| SelfKind::Region(ref lt, m) => { |
| word(&mut self.s, "&")?; |
| self.print_opt_lifetime(lt)?; |
| self.print_mutability(m)?; |
| word(&mut self.s, "self") |
| } |
| SelfKind::Explicit(ref typ, m) => { |
| self.print_mutability(m)?; |
| word(&mut self.s, "self")?; |
| self.word_space(":")?; |
| self.print_type(&typ) |
| } |
| } |
| } |
| |
| pub fn print_fn(&mut self, |
| decl: &hir::FnDecl, |
| unsafety: hir::Unsafety, |
| constness: hir::Constness, |
| abi: Abi, |
| name: Option<ast::Name>, |
| generics: &hir::Generics, |
| vis: &hir::Visibility) |
| -> io::Result<()> { |
| self.print_fn_header_info(unsafety, constness, abi, vis)?; |
| |
| if let Some(name) = name { |
| self.nbsp()?; |
| self.print_name(name)?; |
| } |
| self.print_generics(generics)?; |
| self.print_fn_args_and_ret(decl)?; |
| self.print_where_clause(&generics.where_clause) |
| } |
| |
| pub fn print_fn_args_and_ret(&mut self, decl: &hir::FnDecl) -> io::Result<()> { |
| self.popen()?; |
| self.commasep(Inconsistent, &decl.inputs, |s, arg| s.print_arg(arg, false))?; |
| if decl.variadic { |
| word(&mut self.s, ", ...")?; |
| } |
| self.pclose()?; |
| |
| self.print_fn_output(decl) |
| } |
| |
| pub fn print_fn_block_args(&mut self, decl: &hir::FnDecl) -> io::Result<()> { |
| word(&mut self.s, "|")?; |
| self.commasep(Inconsistent, &decl.inputs, |s, arg| s.print_arg(arg, true))?; |
| word(&mut self.s, "|")?; |
| |
| if let hir::DefaultReturn(..) = decl.output { |
| return Ok(()); |
| } |
| |
| self.space_if_not_bol()?; |
| self.word_space("->")?; |
| match decl.output { |
| hir::Return(ref ty) => { |
| self.print_type(&ty)?; |
| self.maybe_print_comment(ty.span.lo) |
| } |
| hir::DefaultReturn(..) => unreachable!(), |
| } |
| } |
| |
| 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() { |
| word(&mut self.s, prefix)?; |
| let mut first = true; |
| for bound in bounds { |
| self.nbsp()?; |
| if first { |
| first = false; |
| } else { |
| self.word_space("+")?; |
| } |
| |
| match *bound { |
| TraitTyParamBound(ref tref, TraitBoundModifier::None) => { |
| self.print_poly_trait_ref(tref) |
| } |
| TraitTyParamBound(ref tref, TraitBoundModifier::Maybe) => { |
| 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<()> { |
| self.print_lifetime(&lifetime.lifetime)?; |
| let mut sep = ":"; |
| for v in &lifetime.bounds { |
| word(&mut self.s, sep)?; |
| 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(()); |
| } |
| |
| word(&mut self.s, "<")?; |
| |
| let mut ints = Vec::new(); |
| for i in 0..total { |
| ints.push(i); |
| } |
| |
| 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) |
| } |
| })?; |
| |
| word(&mut self.s, ">")?; |
| Ok(()) |
| } |
| |
| pub fn print_ty_param(&mut self, param: &hir::TyParam) -> io::Result<()> { |
| self.print_name(param.name)?; |
| self.print_bounds(":", ¶m.bounds)?; |
| match param.default { |
| Some(ref default) => { |
| space(&mut self.s)?; |
| 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(()); |
| } |
| |
| space(&mut self.s)?; |
| self.word_space("where")?; |
| |
| for (i, predicate) in where_clause.predicates.iter().enumerate() { |
| if i != 0 { |
| self.word_space(",")?; |
| } |
| |
| match predicate { |
| &hir::WherePredicate::BoundPredicate(hir::WhereBoundPredicate{ref bound_lifetimes, |
| ref bounded_ty, |
| ref bounds, |
| ..}) => { |
| self.print_formal_lifetime_list(bound_lifetimes)?; |
| self.print_type(&bounded_ty)?; |
| self.print_bounds(":", bounds)?; |
| } |
| &hir::WherePredicate::RegionPredicate(hir::WhereRegionPredicate{ref lifetime, |
| ref bounds, |
| ..}) => { |
| self.print_lifetime(lifetime)?; |
| word(&mut self.s, ":")?; |
| |
| for (i, bound) in bounds.iter().enumerate() { |
| self.print_lifetime(bound)?; |
| |
| if i != 0 { |
| word(&mut self.s, ":")?; |
| } |
| } |
| } |
| &hir::WherePredicate::EqPredicate(hir::WhereEqPredicate{ref path, ref ty, ..}) => { |
| self.print_path(path, false, 0)?; |
| space(&mut self.s)?; |
| self.word_space("=")?; |
| 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) => { |
| self.print_path(path, false, 0)?; |
| |
| if path.segments.last().unwrap().name != name { |
| space(&mut self.s)?; |
| self.word_space("as")?; |
| self.print_name(name)?; |
| } |
| |
| Ok(()) |
| } |
| |
| hir::ViewPathGlob(ref path) => { |
| self.print_path(path, false, 0)?; |
| word(&mut self.s, "::*") |
| } |
| |
| hir::ViewPathList(ref path, ref segments) => { |
| if path.segments.is_empty() { |
| word(&mut self.s, "{")?; |
| } else { |
| self.print_path(path, false, 0)?; |
| word(&mut self.s, "::{")?; |
| } |
| self.commasep(Inconsistent, &segments[..], |s, w| s.print_name(w.node.name))?; |
| 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<()> { |
| self.print_mutability(mt.mutbl)?; |
| self.print_type(&mt.ty) |
| } |
| |
| pub fn print_arg(&mut self, input: &hir::Arg, is_closure: bool) -> io::Result<()> { |
| self.ibox(indent_unit)?; |
| match input.ty.node { |
| hir::TyInfer if is_closure => self.print_pat(&input.pat)?, |
| _ => { |
| if let Some(eself) = input.to_self() { |
| self.print_explicit_self(&eself)?; |
| } else { |
| let invalid = if let PatKind::Binding(_, name, _) = input.pat.node { |
| name.node == keywords::Invalid.name() |
| } else { |
| false |
| }; |
| if !invalid { |
| self.print_pat(&input.pat)?; |
| word(&mut self.s, ":")?; |
| space(&mut self.s)?; |
| } |
| 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(()); |
| } |
| |
| self.space_if_not_bol()?; |
| self.ibox(indent_unit)?; |
| self.word_space("->")?; |
| match decl.output { |
| hir::DefaultReturn(..) => unreachable!(), |
| hir::Return(ref ty) => self.print_type(&ty)?, |
| } |
| 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, |
| unsafety: hir::Unsafety, |
| decl: &hir::FnDecl, |
| name: Option<ast::Name>, |
| generics: &hir::Generics) |
| -> io::Result<()> { |
| self.ibox(indent_unit)?; |
| if !generics.lifetimes.is_empty() || !generics.ty_params.is_empty() { |
| word(&mut self.s, "for")?; |
| 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(), |
| }, |
| span: syntax_pos::DUMMY_SP, |
| }; |
| self.print_fn(decl, |
| unsafety, |
| hir::Constness::NotConst, |
| abi, |
| name, |
| &generics, |
| &hir::Inherited)?; |
| self.end() |
| } |
| |
| pub fn maybe_print_trailing_comment(&mut self, |
| span: syntax_pos::Span, |
| next_pos: Option<BytePos>) |
| -> io::Result<()> { |
| let cm = match self.cm { |
| Some(cm) => cm, |
| _ => return Ok(()), |
| }; |
| if let Some(ref cmnt) = self.next_comment() { |
| 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); |
| if let Some(p) = next_pos { |
| next = p; |
| } |
| if span.hi < (*cmnt).pos && (*cmnt).pos < next && |
| span_line.line == comment_line.line { |
| 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() { |
| hardbreak(&mut self.s)?; |
| } |
| loop { |
| match self.next_comment() { |
| Some(ref cmnt) => { |
| 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>) |
| -> io::Result<()> { |
| match opt_abi { |
| Some(Abi::Rust) => Ok(()), |
| Some(abi) => { |
| self.word_nbsp("extern")?; |
| self.word_nbsp(&abi.to_string()) |
| } |
| None => Ok(()), |
| } |
| } |
| |
| pub fn print_extern_opt_abi(&mut self, opt_abi: Option<Abi>) -> io::Result<()> { |
| match opt_abi { |
| Some(abi) => { |
| 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, |
| vis: &hir::Visibility) |
| -> io::Result<()> { |
| word(&mut self.s, &visibility_qualified(vis, ""))?; |
| self.print_unsafety(unsafety)?; |
| |
| match constness { |
| hir::Constness::NotConst => {} |
| hir::Constness::Const => self.word_nbsp("const")?, |
| } |
| |
| if abi != Abi::Rust { |
| self.word_nbsp("extern")?; |
| 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 |
| } |
| } |
| } |
