// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 or the MIT license // , at your // option. This file may not be copied, modified, or distributed // except according to those terms. use abi; use ast::{FnUnboxedClosureKind, FnMutUnboxedClosureKind}; use ast::{FnOnceUnboxedClosureKind}; use ast::{MethodImplItem, RegionTyParamBound, TraitTyParamBound}; use ast::{RequiredMethod, ProvidedMethod, TypeImplItem, TypeTraitItem}; use ast::{UnboxedClosureKind, UnboxedFnTyParamBound}; use ast; use ast_util; use owned_slice::OwnedSlice; use attr::{AttrMetaMethods, AttributeMethods}; use codemap::{CodeMap, BytePos}; use codemap; use diagnostic; use parse::token::{BinOpToken, Token}; use parse::token; use parse::lexer::comments; use parse; use print::pp::{break_offset, word, space, zerobreak, hardbreak}; use print::pp::{Breaks, Consistent, Inconsistent, eof}; use print::pp; use ptr::P; use std::io::{IoResult, MemWriter}; use std::io; use std::mem; pub enum AnnNode<'a> { NodeIdent(&'a ast::Ident), NodeName(&'a ast::Name), NodeBlock(&'a ast::Block), NodeItem(&'a ast::Item), NodeExpr(&'a ast::Expr), NodePat(&'a ast::Pat), } pub trait PpAnn { fn pre(&self, _state: &mut State, _node: AnnNode) -> IoResult<()> { Ok(()) } fn post(&self, _state: &mut State, _node: AnnNode) -> IoResult<()> { Ok(()) } } pub struct NoAnn; impl PpAnn for NoAnn {} pub struct CurrentCommentAndLiteral { cur_cmnt: uint, cur_lit: uint, } pub struct State<'a> { pub s: pp::Printer, cm: Option<&'a CodeMap>, comments: Option >, literals: Option >, cur_cmnt_and_lit: CurrentCommentAndLiteral, boxes: Vec, ann: &'a PpAnn+'a, encode_idents_with_hygiene: bool, } pub fn rust_printer(writer: Box) -> State<'static> { static NO_ANN: NoAnn = NoAnn; rust_printer_annotated(writer, &NO_ANN) } pub fn rust_printer_annotated<'a>(writer: Box, ann: &'a PpAnn) -> State<'a> { State { s: pp::mk_printer(writer, default_columns), cm: None, comments: None, literals: None, cur_cmnt_and_lit: CurrentCommentAndLiteral { cur_cmnt: 0, cur_lit: 0 }, boxes: Vec::new(), ann: ann, encode_idents_with_hygiene: false, } } #[allow(non_uppercase_statics)] pub const indent_unit: uint = 4u; #[allow(non_uppercase_statics)] pub const default_columns: uint = 78u; /// 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: &diagnostic::SpanHandler, krate: &ast::Crate, filename: String, input: &mut io::Reader, out: Box, ann: &'a PpAnn, is_expanded: bool) -> IoResult<()> { let mut s = State::new_from_input(cm, span_diagnostic, filename, input, out, ann, is_expanded); try!(s.print_mod(&krate.module, krate.attrs.as_slice())); try!(s.print_remaining_comments()); eof(&mut s.s) } impl<'a> State<'a> { pub fn new_from_input(cm: &'a CodeMap, span_diagnostic: &diagnostic::SpanHandler, filename: String, input: &mut io::Reader, out: Box, ann: &'a PpAnn, is_expanded: bool) -> 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) }) } pub fn new(cm: &'a CodeMap, out: Box, ann: &'a PpAnn, comments: Option>, literals: Option>) -> State<'a> { State { s: pp::mk_printer(out, default_columns), cm: Some(cm), comments: comments, literals: literals, cur_cmnt_and_lit: CurrentCommentAndLiteral { cur_cmnt: 0, cur_lit: 0 }, boxes: Vec::new(), ann: ann, encode_idents_with_hygiene: false, } } } pub fn to_string(f: |&mut State| -> IoResult<()>) -> String { use std::raw::TraitObject; let mut s = rust_printer(box MemWriter::new()); f(&mut s).unwrap(); eof(&mut s.s).unwrap(); unsafe { // FIXME(pcwalton): A nasty function to extract the string from an `io::Writer` // that we "know" to be a `MemWriter` that works around the lack of checked // downcasts. let obj: TraitObject = mem::transmute_copy(&s.s.out); let wr: Box = mem::transmute(obj.data); let result = String::from_utf8(wr.get_ref().as_slice().to_vec()).unwrap(); mem::forget(wr); result.to_string() } } 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 token_to_string(tok: &Token) -> String { match *tok { token::Eq => "=".into_string(), token::Lt => "<".into_string(), token::Le => "<=".into_string(), token::EqEq => "==".into_string(), token::Ne => "!=".into_string(), token::Ge => ">=".into_string(), token::Gt => ">".into_string(), token::Not => "!".into_string(), token::Tilde => "~".into_string(), token::OrOr => "||".into_string(), token::AndAnd => "&&".into_string(), token::BinOp(op) => binop_to_string(op).into_string(), token::BinOpEq(op) => format!("{}=", binop_to_string(op)), /* Structural symbols */ token::At => "@".into_string(), token::Dot => ".".into_string(), token::DotDot => "..".into_string(), token::DotDotDot => "...".into_string(), token::Comma => ",".into_string(), token::Semi => ";".into_string(), token::Colon => ":".into_string(), token::ModSep => "::".into_string(), token::RArrow => "->".into_string(), token::LArrow => "<-".into_string(), token::FatArrow => "=>".into_string(), token::LParen => "(".into_string(), token::RParen => ")".into_string(), token::LBracket => "[".into_string(), token::RBracket => "]".into_string(), token::LBrace => "{".into_string(), token::RBrace => "}".into_string(), token::Pound => "#".into_string(), token::Dollar => "$".into_string(), token::Question => "?".into_string(), /* Literals */ token::LitByte(b) => format!("b'{}'", b.as_str()), token::LitChar(c) => format!("'{}'", c.as_str()), token::LitFloat(c) => c.as_str().into_string(), token::LitInteger(c) => c.as_str().into_string(), token::LitStr(s) => format!("\"{}\"", s.as_str()), token::LitStrRaw(s, n) => format!("r{delim}\"{string}\"{delim}", delim="#".repeat(n), string=s.as_str()), token::LitBinary(v) => format!("b\"{}\"", v.as_str()), token::LitBinaryRaw(s, n) => format!("br{delim}\"{string}\"{delim}", delim="#".repeat(n), string=s.as_str()), /* Name components */ token::Ident(s, _) => token::get_ident(s).get().into_string(), token::Lifetime(s) => format!("{}", token::get_ident(s)), token::Underscore => "_".into_string(), /* Other */ token::DocComment(s) => s.as_str().into_string(), token::Eof => "".into_string(), token::Whitespace => " ".into_string(), token::Comment => "/* */".into_string(), token::Shebang(s) => format!("/* shebang: {}*/", s.as_str()), token::Interpolated(ref nt) => match *nt { token::NtExpr(ref e) => expr_to_string(&**e), token::NtMeta(ref e) => meta_item_to_string(&**e), token::NtTy(ref e) => ty_to_string(&**e), token::NtPath(ref e) => path_to_string(&**e), token::NtItem(..) => "an interpolated item".into_string(), token::NtBlock(..) => "an interpolated block".into_string(), token::NtStmt(..) => "an interpolated statement".into_string(), token::NtPat(..) => "an interpolated pattern".into_string(), token::NtIdent(..) => "an interpolated identifier".into_string(), token::NtTT(..) => "an interpolated tt".into_string(), token::NtMatchers(..) => "an interpolated matcher sequence".into_string(), } } } // FIXME (Issue #16472): the thing_to_string_impls macro should go away // after we revise the syntax::ext::quote::ToToken impls to go directly // to token-trees instead of thing -> string -> token-trees. macro_rules! thing_to_string_impls { ($to_string:ident) => { pub fn ty_to_string(ty: &ast::Ty) -> String { $to_string(|s| s.print_type(ty)) } pub fn pat_to_string(pat: &ast::Pat) -> String { $to_string(|s| s.print_pat(pat)) } pub fn arm_to_string(arm: &ast::Arm) -> String { $to_string(|s| s.print_arm(arm)) } pub fn expr_to_string(e: &ast::Expr) -> String { $to_string(|s| s.print_expr(e)) } pub fn lifetime_to_string(e: &ast::Lifetime) -> String { $to_string(|s| s.print_lifetime(e)) } pub fn tt_to_string(tt: &ast::TokenTree) -> String { $to_string(|s| s.print_tt(tt)) } pub fn tts_to_string(tts: &[ast::TokenTree]) -> String { $to_string(|s| s.print_tts(tts)) } pub fn stmt_to_string(stmt: &ast::Stmt) -> String { $to_string(|s| s.print_stmt(stmt)) } pub fn item_to_string(i: &ast::Item) -> String { $to_string(|s| s.print_item(i)) } pub fn view_item_to_string(i: &ast::ViewItem) -> String { $to_string(|s| s.print_view_item(i)) } pub fn generics_to_string(generics: &ast::Generics) -> String { $to_string(|s| s.print_generics(generics)) } pub fn ty_method_to_string(p: &ast::TypeMethod) -> String { $to_string(|s| s.print_ty_method(p)) } pub fn method_to_string(p: &ast::Method) -> String { $to_string(|s| s.print_method(p)) } pub fn fn_block_to_string(p: &ast::FnDecl) -> String { $to_string(|s| s.print_fn_block_args(p, None)) } pub fn path_to_string(p: &ast::Path) -> String { $to_string(|s| s.print_path(p, false)) } pub fn ident_to_string(id: &ast::Ident) -> String { $to_string(|s| s.print_ident(*id)) } pub fn fun_to_string(decl: &ast::FnDecl, fn_style: ast::FnStyle, name: ast::Ident, opt_explicit_self: Option<&ast::ExplicitSelf_>, generics: &ast::Generics) -> String { $to_string(|s| { try!(s.print_fn(decl, Some(fn_style), abi::Rust, name, generics, opt_explicit_self, ast::Inherited)); try!(s.end()); // Close the head box s.end() // Close the outer box }) } pub fn block_to_string(blk: &ast::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(0u)); s.print_block(blk) }) } pub fn meta_item_to_string(mi: &ast::MetaItem) -> String { $to_string(|s| s.print_meta_item(mi)) } pub fn attribute_to_string(attr: &ast::Attribute) -> String { $to_string(|s| s.print_attribute(attr)) } pub fn lit_to_string(l: &ast::Lit) -> String { $to_string(|s| s.print_literal(l)) } pub fn explicit_self_to_string(explicit_self: &ast::ExplicitSelf_) -> String { $to_string(|s| s.print_explicit_self(explicit_self, ast::MutImmutable).map(|_| {})) } pub fn variant_to_string(var: &ast::Variant) -> String { $to_string(|s| s.print_variant(var)) } pub fn arg_to_string(arg: &ast::Arg) -> String { $to_string(|s| s.print_arg(arg)) } pub fn mac_to_string(arg: &ast::Mac) -> String { $to_string(|s| s.print_mac(arg)) } } } thing_to_string_impls!(to_string) // FIXME (Issue #16472): the whole `with_hygiene` mod should go away // after we revise the syntax::ext::quote::ToToken impls to go directly // to token-trees instea of thing -> string -> token-trees. pub mod with_hygiene { use abi; use ast; use std::io::IoResult; use super::indent_unit; // This function is the trick that all the rest of the routines // hang on. pub fn to_string_hyg(f: |&mut super::State| -> IoResult<()>) -> String { super::to_string(|s| { s.encode_idents_with_hygiene = true; f(s) }) } thing_to_string_impls!(to_string_hyg) } pub fn visibility_qualified(vis: ast::Visibility, s: &str) -> String { match vis { ast::Public => format!("pub {}", s), ast::Inherited => s.to_string() } } fn needs_parentheses(expr: &ast::Expr) -> bool { match expr.node { ast::ExprAssign(..) | ast::ExprBinary(..) | ast::ExprFnBlock(..) | ast::ExprProc(..) | ast::ExprUnboxedFn(..) | ast::ExprAssignOp(..) | ast::ExprCast(..) => true, _ => false, } } impl<'a> State<'a> { pub fn ibox(&mut self, u: uint) -> IoResult<()> { self.boxes.push(pp::Inconsistent); pp::ibox(&mut self.s, u) } pub fn end(&mut self) -> IoResult<()> { self.boxes.pop().unwrap(); pp::end(&mut self.s) } pub fn cbox(&mut self, u: uint) -> IoResult<()> { self.boxes.push(pp::Consistent); pp::cbox(&mut self.s, u) } // "raw box" pub fn rbox(&mut self, u: uint, b: pp::Breaks) -> IoResult<()> { self.boxes.push(b); pp::rbox(&mut self.s, u, b) } pub fn nbsp(&mut self) -> IoResult<()> { word(&mut self.s, " ") } pub fn word_nbsp(&mut self, w: &str) -> IoResult<()> { try!(word(&mut self.s, w)); self.nbsp() } pub fn word_space(&mut self, w: &str) -> IoResult<()> { try!(word(&mut self.s, w)); space(&mut self.s) } pub fn popen(&mut self) -> IoResult<()> { word(&mut self.s, "(") } pub fn pclose(&mut self) -> IoResult<()> { word(&mut self.s, ")") } pub fn head(&mut self, w: &str) -> IoResult<()> { // 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) -> IoResult<()> { try!(word(&mut self.s, "{")); self.end() // close the head-box } pub fn bclose_(&mut self, span: codemap::Span, indented: uint) -> IoResult<()> { self.bclose_maybe_open(span, indented, true) } pub fn bclose_maybe_open (&mut self, span: codemap::Span, indented: uint, close_box: bool) -> IoResult<()> { try!(self.maybe_print_comment(span.hi)); try!(self.break_offset_if_not_bol(1u, -(indented as int))); try!(word(&mut self.s, "}")); if close_box { try!(self.end()); // close the outer-box } Ok(()) } pub fn bclose(&mut self, span: codemap::Span) -> IoResult<()> { self.bclose_(span, indent_unit) } pub fn is_begin(&mut self) -> bool { match self.s.last_token() { pp::Begin(_) => true, _ => false } } pub fn is_end(&mut self) -> bool { match self.s.last_token() { pp::End => true, _ => false } } // is this the beginning of a line? pub fn is_bol(&mut self) -> bool { self.s.last_token().is_eof() || self.s.last_token().is_hardbreak_tok() } pub fn in_cbox(&self) -> bool { match self.boxes.last() { Some(&last_box) => last_box == pp::Consistent, None => false } } pub fn hardbreak_if_not_bol(&mut self) -> IoResult<()> { if !self.is_bol() { try!(hardbreak(&mut self.s)) } Ok(()) } pub fn space_if_not_bol(&mut self) -> IoResult<()> { if !self.is_bol() { try!(space(&mut self.s)); } Ok(()) } pub fn break_offset_if_not_bol(&mut self, n: uint, off: int) -> IoResult<()> { 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) -> IoResult<()> { try!(word(&mut self.s, "/*")); try!(space(&mut self.s)); try!(word(&mut self.s, text.as_slice())); try!(space(&mut self.s)); word(&mut self.s, "*/") } pub fn commasep(&mut self, b: Breaks, elts: &[T], op: |&mut State, &T| -> IoResult<()>) -> IoResult<()> { try!(self.rbox(0u, b)); let mut first = true; for elt in elts.iter() { if first { first = false; } else { try!(self.word_space(",")); } try!(op(self, elt)); } self.end() } pub fn commasep_cmnt( &mut self, b: Breaks, elts: &[T], op: |&mut State, &T| -> IoResult<()>, get_span: |&T| -> codemap::Span) -> IoResult<()> { try!(self.rbox(0u, b)); let len = elts.len(); let mut i = 0u; for elt in elts.iter() { try!(self.maybe_print_comment(get_span(elt).hi)); try!(op(self, elt)); i += 1u; 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]) -> IoResult<()> { self.commasep_cmnt(b, exprs, |s, e| s.print_expr(&**e), |e| e.span) } pub fn print_mod(&mut self, _mod: &ast::Mod, attrs: &[ast::Attribute]) -> IoResult<()> { try!(self.print_inner_attributes(attrs)); for vitem in _mod.view_items.iter() { try!(self.print_view_item(vitem)); } for item in _mod.items.iter() { try!(self.print_item(&**item)); } Ok(()) } pub fn print_foreign_mod(&mut self, nmod: &ast::ForeignMod, attrs: &[ast::Attribute]) -> IoResult<()> { try!(self.print_inner_attributes(attrs)); for vitem in nmod.view_items.iter() { try!(self.print_view_item(vitem)); } for item in nmod.items.iter() { try!(self.print_foreign_item(&**item)); } Ok(()) } pub fn print_opt_lifetime(&mut self, lifetime: &Option) -> IoResult<()> { for l in lifetime.iter() { try!(self.print_lifetime(l)); try!(self.nbsp()); } Ok(()) } pub fn print_type(&mut self, ty: &ast::Ty) -> IoResult<()> { try!(self.maybe_print_comment(ty.span.lo)); try!(self.ibox(0u)); match ty.node { ast::TyNil => try!(word(&mut self.s, "()")), ast::TyBot => try!(word(&mut self.s, "!")), ast::TyUniq(ref ty) => { try!(word(&mut self.s, "~")); try!(self.print_type(&**ty)); } ast::TyVec(ref ty) => { try!(word(&mut self.s, "[")); try!(self.print_type(&**ty)); try!(word(&mut self.s, "]")); } ast::TyPtr(ref mt) => { try!(word(&mut self.s, "*")); match mt.mutbl { ast::MutMutable => try!(self.word_nbsp("mut")), ast::MutImmutable => try!(self.word_nbsp("const")), } try!(self.print_type(&*mt.ty)); } ast::TyRptr(ref lifetime, ref mt) => { try!(word(&mut self.s, "&")); try!(self.print_opt_lifetime(lifetime)); try!(self.print_mt(mt)); } ast::TyTup(ref elts) => { try!(self.popen()); try!(self.commasep(Inconsistent, elts.as_slice(), |s, ty| s.print_type(&**ty))); if elts.len() == 1 { try!(word(&mut self.s, ",")); } try!(self.pclose()); } ast::TyParen(ref typ) => { try!(self.popen()); try!(self.print_type(&**typ)); try!(self.pclose()); } ast::TyBareFn(ref f) => { let generics = ast::Generics { lifetimes: f.lifetimes.clone(), ty_params: OwnedSlice::empty(), where_clause: ast::WhereClause { id: ast::DUMMY_NODE_ID, predicates: Vec::new(), }, }; try!(self.print_ty_fn(Some(f.abi), None, f.fn_style, ast::Many, &*f.decl, None, &OwnedSlice::empty(), Some(&generics), None, None)); } ast::TyClosure(ref f) => { let generics = ast::Generics { lifetimes: f.lifetimes.clone(), ty_params: OwnedSlice::empty(), where_clause: ast::WhereClause { id: ast::DUMMY_NODE_ID, predicates: Vec::new(), }, }; try!(self.print_ty_fn(None, Some('&'), f.fn_style, f.onceness, &*f.decl, None, &f.bounds, Some(&generics), None, None)); } ast::TyProc(ref f) => { let generics = ast::Generics { lifetimes: f.lifetimes.clone(), ty_params: OwnedSlice::empty(), where_clause: ast::WhereClause { id: ast::DUMMY_NODE_ID, predicates: Vec::new(), }, }; try!(self.print_ty_fn(None, Some('~'), f.fn_style, f.onceness, &*f.decl, None, &f.bounds, Some(&generics), None, None)); } ast::TyUnboxedFn(ref f) => { try!(self.print_ty_fn(None, None, ast::NormalFn, ast::Many, &*f.decl, None, &OwnedSlice::empty(), None, None, Some(f.kind))); } ast::TyPath(ref path, ref bounds, _) => { try!(self.print_bounded_path(path, bounds)); } ast::TyQPath(ref qpath) => { try!(word(&mut self.s, "<")); try!(self.print_type(&*qpath.for_type)); try!(space(&mut self.s)); try!(self.word_space("as")); try!(self.print_path(&qpath.trait_name, false)); try!(word(&mut self.s, ">")); try!(word(&mut self.s, "::")); try!(self.print_ident(qpath.item_name)); } ast::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, "]")); } ast::TyTypeof(ref e) => { try!(word(&mut self.s, "typeof(")); try!(self.print_expr(&**e)); try!(word(&mut self.s, ")")); } ast::TyInfer => { try!(word(&mut self.s, "_")); } } self.end() } pub fn print_foreign_item(&mut self, item: &ast::ForeignItem) -> IoResult<()> { try!(self.hardbreak_if_not_bol()); try!(self.maybe_print_comment(item.span.lo)); try!(self.print_outer_attributes(item.attrs.as_slice())); match item.node { ast::ForeignItemFn(ref decl, ref generics) => { try!(self.print_fn(&**decl, None, abi::Rust, item.ident, generics, None, item.vis)); try!(self.end()); // end head-ibox try!(word(&mut self.s, ";")); self.end() // end the outer fn box } ast::ForeignItemStatic(ref t, m) => { try!(self.head(visibility_qualified(item.vis, "static").as_slice())); if m { try!(self.word_space("mut")); } try!(self.print_ident(item.ident)); 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_type(&mut self, typedef: &ast::AssociatedType) -> IoResult<()> { try!(self.word_space("type")); try!(self.print_ident(typedef.ident)); word(&mut self.s, ";") } fn print_typedef(&mut self, typedef: &ast::Typedef) -> IoResult<()> { try!(self.word_space("type")); try!(self.print_ident(typedef.ident)); try!(space(&mut self.s)); try!(self.word_space("=")); try!(self.print_type(&*typedef.typ)); word(&mut self.s, ";") } /// Pretty-print an item pub fn print_item(&mut self, item: &ast::Item) -> IoResult<()> { try!(self.hardbreak_if_not_bol()); try!(self.maybe_print_comment(item.span.lo)); try!(self.print_outer_attributes(item.attrs.as_slice())); try!(self.ann.pre(self, NodeItem(item))); match item.node { ast::ItemStatic(ref ty, m, ref expr) => { try!(self.head(visibility_qualified(item.vis, "static").as_slice())); if m == ast::MutMutable { try!(self.word_space("mut")); } try!(self.print_ident(item.ident)); 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 } ast::ItemConst(ref ty, ref expr) => { try!(self.head(visibility_qualified(item.vis, "const").as_slice())); try!(self.print_ident(item.ident)); 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 } ast::ItemFn(ref decl, fn_style, abi, ref typarams, ref body) => { try!(self.print_fn( &**decl, Some(fn_style), abi, item.ident, typarams, None, item.vis )); try!(word(&mut self.s, " ")); try!(self.print_block_with_attrs(&**body, item.attrs.as_slice())); } ast::ItemMod(ref _mod) => { try!(self.head(visibility_qualified(item.vis, "mod").as_slice())); try!(self.print_ident(item.ident)); try!(self.nbsp()); try!(self.bopen()); try!(self.print_mod(_mod, item.attrs.as_slice())); try!(self.bclose(item.span)); } ast::ItemForeignMod(ref nmod) => { try!(self.head("extern")); try!(self.word_nbsp(nmod.abi.to_string().as_slice())); try!(self.bopen()); try!(self.print_foreign_mod(nmod, item.attrs.as_slice())); try!(self.bclose(item.span)); } ast::ItemTy(ref ty, ref params) => { try!(self.ibox(indent_unit)); try!(self.ibox(0u)); try!(self.word_nbsp(visibility_qualified(item.vis, "type").as_slice())); try!(self.print_ident(item.ident)); try!(self.print_generics(params)); try!(self.end()); // end the inner ibox try!(space(&mut self.s)); try!(self.word_space("=")); try!(self.print_type(&**ty)); try!(self.print_where_clause(params)); try!(word(&mut self.s, ";")); try!(self.end()); // end the outer ibox } ast::ItemEnum(ref enum_definition, ref params) => { try!(self.print_enum_def( enum_definition, params, item.ident, item.span, item.vis )); } ast::ItemStruct(ref struct_def, ref generics) => { try!(self.head(visibility_qualified(item.vis,"struct").as_slice())); try!(self.print_struct(&**struct_def, generics, item.ident, item.span)); } ast::ItemImpl(ref generics, ref opt_trait, ref ty, ref impl_items) => { try!(self.head(visibility_qualified(item.vis, "impl").as_slice())); if generics.is_parameterized() { try!(self.print_generics(generics)); try!(space(&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)); try!(space(&mut self.s)); try!(self.bopen()); try!(self.print_inner_attributes(item.attrs.as_slice())); for impl_item in impl_items.iter() { match *impl_item { ast::MethodImplItem(ref meth) => { try!(self.print_method(&**meth)); } ast::TypeImplItem(ref typ) => { try!(self.print_typedef(&**typ)); } } } try!(self.bclose(item.span)); } ast::ItemTrait(ref generics, ref unbound, ref bounds, ref methods) => { try!(self.head(visibility_qualified(item.vis, "trait").as_slice())); try!(self.print_ident(item.ident)); try!(self.print_generics(generics)); match unbound { &Some(TraitTyParamBound(ref tref)) => { try!(space(&mut self.s)); try!(self.word_space("for")); try!(self.print_trait_ref(tref)); try!(word(&mut self.s, "?")); } _ => {} } try!(self.print_bounds(":", bounds)); try!(self.print_where_clause(generics)); try!(word(&mut self.s, " ")); try!(self.bopen()); for meth in methods.iter() { try!(self.print_trait_method(meth)); } try!(self.bclose(item.span)); } // I think it's reasonable to hide the context here: ast::ItemMac(codemap::Spanned { node: ast::MacInvocTT(ref pth, ref tts, _), ..}) => { try!(self.print_visibility(item.vis)); try!(self.print_path(pth, false)); try!(word(&mut self.s, "! ")); try!(self.print_ident(item.ident)); try!(self.cbox(indent_unit)); try!(self.popen()); try!(self.print_tts(tts.as_slice())); try!(self.pclose()); try!(self.end()); } } self.ann.post(self, NodeItem(item)) } fn print_trait_ref(&mut self, t: &ast::TraitRef) -> IoResult<()> { if t.lifetimes.len() > 0 { try!(self.print_generics(&ast::Generics { lifetimes: t.lifetimes.clone(), ty_params: OwnedSlice::empty(), where_clause: ast::WhereClause { id: ast::DUMMY_NODE_ID, predicates: Vec::new(), }, })); } self.print_path(&t.path, false) } pub fn print_enum_def(&mut self, enum_definition: &ast::EnumDef, generics: &ast::Generics, ident: ast::Ident, span: codemap::Span, visibility: ast::Visibility) -> IoResult<()> { try!(self.head(visibility_qualified(visibility, "enum").as_slice())); try!(self.print_ident(ident)); try!(self.print_generics(generics)); try!(self.print_where_clause(generics)); try!(space(&mut self.s)); self.print_variants(enum_definition.variants.as_slice(), span) } pub fn print_variants(&mut self, variants: &[P], span: codemap::Span) -> IoResult<()> { try!(self.bopen()); for v in variants.iter() { try!(self.space_if_not_bol()); try!(self.maybe_print_comment(v.span.lo)); try!(self.print_outer_attributes(v.node.attrs.as_slice())); 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: ast::Visibility) -> IoResult<()> { match vis { ast::Public => self.word_nbsp("pub"), ast::Inherited => Ok(()) } } pub fn print_struct(&mut self, struct_def: &ast::StructDef, generics: &ast::Generics, ident: ast::Ident, span: codemap::Span) -> IoResult<()> { try!(self.print_ident(ident)); try!(self.print_generics(generics)); if ast_util::struct_def_is_tuple_like(struct_def) { if !struct_def.fields.is_empty() { try!(self.popen()); try!(self.commasep( Inconsistent, struct_def.fields.as_slice(), |s, field| { match field.node.kind { ast::NamedField(..) => fail!("unexpected named field"), ast::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!(word(&mut self.s, ";")); try!(self.end()); self.end() // close the outer-box } else { try!(self.nbsp()); try!(self.bopen()); try!(self.hardbreak_if_not_bol()); for field in struct_def.fields.iter() { match field.node.kind { ast::UnnamedField(..) => fail!("unexpected unnamed field"), ast::NamedField(ident, visibility) => { try!(self.hardbreak_if_not_bol()); try!(self.maybe_print_comment(field.span.lo)); try!(self.print_outer_attributes(field.node.attrs.as_slice())); try!(self.print_visibility(visibility)); try!(self.print_ident(ident)); try!(self.word_nbsp(":")); try!(self.print_type(&*field.node.ty)); try!(word(&mut self.s, ",")); } } } self.bclose(span) } } /// This doesn't deserve to be called "pretty" printing, but it should be /// meaning-preserving. A quick hack that might help would be to look at the /// spans embedded in the TTs to decide where to put spaces and newlines. /// But it'd be better to parse these according to the grammar of the /// appropriate macro, transcribe back into the grammar we just parsed from, /// and then pretty-print the resulting AST nodes (so, e.g., we print /// expression arguments as expressions). It can be done! I think. pub fn print_tt(&mut self, tt: &ast::TokenTree) -> IoResult<()> { match *tt { ast::TtDelimited(_, ref delimed) => { let (ref open, ref tts, ref close) = **delimed; try!(word(&mut self.s, token_to_string(&open.token).as_slice())); try!(space(&mut self.s)); try!(self.print_tts(tts.as_slice())); try!(space(&mut self.s)); word(&mut self.s, token_to_string(&close.token).as_slice()) }, ast::TtToken(_, ref tk) => { try!(word(&mut self.s, token_to_string(tk).as_slice())); match *tk { parse::token::DocComment(..) => { hardbreak(&mut self.s) } _ => Ok(()) } } ast::TtSequence(_, ref tts, ref separator, kleene_op) => { try!(word(&mut self.s, "$(")); for tt_elt in (*tts).iter() { try!(self.print_tt(tt_elt)); } try!(word(&mut self.s, ")")); match *separator { Some(ref tk) => { try!(word(&mut self.s, token_to_string(tk).as_slice())); } None => {}, } match kleene_op { ast::ZeroOrMore => word(&mut self.s, "*"), ast::OneOrMore => word(&mut self.s, "+"), } } ast::TtNonterminal(_, name) => { try!(word(&mut self.s, "$")); self.print_ident(name) } } } pub fn print_tts(&mut self, tts: &[ast::TokenTree]) -> IoResult<()> { try!(self.ibox(0)); for (i, tt) in tts.iter().enumerate() { if i != 0 { try!(space(&mut self.s)); } try!(self.print_tt(tt)); } self.end() } pub fn print_variant(&mut self, v: &ast::Variant) -> IoResult<()> { try!(self.print_visibility(v.node.vis)); match v.node.kind { ast::TupleVariantKind(ref args) => { try!(self.print_ident(v.node.name)); if !args.is_empty() { try!(self.popen()); try!(self.commasep(Consistent, args.as_slice(), |s, arg| s.print_type(&*arg.ty))); try!(self.pclose()); } } ast::StructVariantKind(ref struct_def) => { try!(self.head("")); let generics = ast_util::empty_generics(); try!(self.print_struct(&**struct_def, &generics, v.node.name, v.span)); } } 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_ty_method(&mut self, m: &ast::TypeMethod) -> IoResult<()> { try!(self.hardbreak_if_not_bol()); try!(self.maybe_print_comment(m.span.lo)); try!(self.print_outer_attributes(m.attrs.as_slice())); try!(self.print_ty_fn(None, None, m.fn_style, ast::Many, &*m.decl, Some(m.ident), &OwnedSlice::empty(), Some(&m.generics), Some(&m.explicit_self.node), None)); word(&mut self.s, ";") } pub fn print_trait_method(&mut self, m: &ast::TraitItem) -> IoResult<()> { match *m { RequiredMethod(ref ty_m) => self.print_ty_method(ty_m), ProvidedMethod(ref m) => self.print_method(&**m), TypeTraitItem(ref t) => self.print_associated_type(&**t), } } pub fn print_impl_item(&mut self, ii: &ast::ImplItem) -> IoResult<()> { match *ii { MethodImplItem(ref m) => self.print_method(&**m), TypeImplItem(ref td) => self.print_typedef(&**td), } } pub fn print_method(&mut self, meth: &ast::Method) -> IoResult<()> { try!(self.hardbreak_if_not_bol()); try!(self.maybe_print_comment(meth.span.lo)); try!(self.print_outer_attributes(meth.attrs.as_slice())); match meth.node { ast::MethDecl(ident, ref generics, abi, ref explicit_self, fn_style, ref decl, ref body, vis) => { try!(self.print_fn(&**decl, Some(fn_style), abi, ident, generics, Some(&explicit_self.node), vis)); try!(word(&mut self.s, " ")); self.print_block_with_attrs(&**body, meth.attrs.as_slice()) }, ast::MethMac(codemap::Spanned { node: ast::MacInvocTT(ref pth, ref tts, _), ..}) => { // code copied from ItemMac: try!(self.print_path(pth, false)); try!(word(&mut self.s, "! ")); try!(self.cbox(indent_unit)); try!(self.popen()); try!(self.print_tts(tts.as_slice())); try!(self.pclose()); self.end() } } } pub fn print_outer_attributes(&mut self, attrs: &[ast::Attribute]) -> IoResult<()> { let mut count = 0u; for attr in attrs.iter() { match attr.node.style { ast::AttrOuter => { try!(self.print_attribute(attr)); count += 1; } _ => {/* fallthrough */ } } } if count > 0 { try!(self.hardbreak_if_not_bol()); } Ok(()) } pub fn print_inner_attributes(&mut self, attrs: &[ast::Attribute]) -> IoResult<()> { let mut count = 0u; for attr in attrs.iter() { match attr.node.style { ast::AttrInner => { try!(self.print_attribute(attr)); count += 1; } _ => {/* fallthrough */ } } } if count > 0 { try!(self.hardbreak_if_not_bol()); } Ok(()) } pub fn print_attribute(&mut self, attr: &ast::Attribute) -> IoResult<()> { try!(self.hardbreak_if_not_bol()); try!(self.maybe_print_comment(attr.span.lo)); if attr.node.is_sugared_doc { word(&mut self.s, attr.value_str().unwrap().get()) } else { match attr.node.style { ast::AttrInner => try!(word(&mut self.s, "#![")), ast::AttrOuter => try!(word(&mut self.s, "#[")), } try!(self.print_meta_item(&*attr.meta())); word(&mut self.s, "]") } } pub fn print_stmt(&mut self, st: &ast::Stmt) -> IoResult<()> { try!(self.maybe_print_comment(st.span.lo)); match st.node { ast::StmtDecl(ref decl, _) => { try!(self.print_decl(&**decl)); } ast::StmtExpr(ref expr, _) => { try!(self.space_if_not_bol()); try!(self.print_expr(&**expr)); } ast::StmtSemi(ref expr, _) => { try!(self.space_if_not_bol()); try!(self.print_expr(&**expr)); try!(word(&mut self.s, ";")); } ast::StmtMac(ref mac, semi) => { try!(self.space_if_not_bol()); try!(self.print_mac(mac)); if semi { try!(word(&mut self.s, ";")); } } } if parse::classify::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: &ast::Block) -> IoResult<()> { self.print_block_with_attrs(blk, &[]) } pub fn print_block_unclosed(&mut self, blk: &ast::Block) -> IoResult<()> { self.print_block_unclosed_indent(blk, indent_unit) } pub fn print_block_unclosed_indent(&mut self, blk: &ast::Block, indented: uint) -> IoResult<()> { self.print_block_maybe_unclosed(blk, indented, &[], false) } pub fn print_block_with_attrs(&mut self, blk: &ast::Block, attrs: &[ast::Attribute]) -> IoResult<()> { self.print_block_maybe_unclosed(blk, indent_unit, attrs, true) } pub fn print_block_maybe_unclosed(&mut self, blk: &ast::Block, indented: uint, attrs: &[ast::Attribute], close_box: bool) -> IoResult<()> { match blk.rules { ast::UnsafeBlock(..) => try!(self.word_space("unsafe")), ast::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 vi in blk.view_items.iter() { try!(self.print_view_item(vi)); } for st in blk.stmts.iter() { 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<&ast::Expr>) -> IoResult<()> { match els { Some(_else) => { match _else.node { // "another else-if" ast::ExprIf(ref i, ref then, ref e) => { try!(self.cbox(indent_unit - 1u)); try!(self.ibox(0u)); 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)) } // "another else-if-let" ast::ExprIfLet(ref pat, ref expr, ref then, ref e) => { try!(self.cbox(indent_unit - 1u)); try!(self.ibox(0u)); try!(word(&mut self.s, " else 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(&**then)); self.print_else(e.as_ref().map(|e| &**e)) } // "final else" ast::ExprBlock(ref b) => { try!(self.cbox(indent_unit - 1u)); try!(self.ibox(0u)); try!(word(&mut self.s, " else ")); self.print_block(&**b) } // BLEAH, constraints would be great here _ => { fail!("print_if saw if with weird alternative"); } } } _ => Ok(()) } } pub fn print_if(&mut self, test: &ast::Expr, blk: &ast::Block, elseopt: Option<&ast::Expr>) -> IoResult<()> { 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: &ast::Pat, expr: &ast::Expr, blk: &ast::Block, elseopt: Option<&ast::Expr>) -> IoResult<()> { 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) } pub fn print_mac(&mut self, m: &ast::Mac) -> IoResult<()> { match m.node { // I think it's reasonable to hide the ctxt here: ast::MacInvocTT(ref pth, ref tts, _) => { try!(self.print_path(pth, false)); try!(word(&mut self.s, "!")); try!(self.popen()); try!(self.print_tts(tts.as_slice())); self.pclose() } } } fn print_call_post(&mut self, args: &[P]) -> IoResult<()> { try!(self.popen()); try!(self.commasep_exprs(Inconsistent, args)); self.pclose() } pub fn print_expr_maybe_paren(&mut self, expr: &ast::Expr) -> IoResult<()> { let needs_par = needs_parentheses(expr); if needs_par { try!(self.popen()); } try!(self.print_expr(expr)); if needs_par { try!(self.pclose()); } Ok(()) } pub fn print_expr(&mut self, expr: &ast::Expr) -> IoResult<()> { try!(self.maybe_print_comment(expr.span.lo)); try!(self.ibox(indent_unit)); try!(self.ann.pre(self, NodeExpr(expr))); match expr.node { ast::ExprBox(ref p, ref e) => { try!(word(&mut self.s, "box")); try!(word(&mut self.s, "(")); try!(self.print_expr(&**p)); try!(self.word_space(")")); try!(self.print_expr(&**e)); } ast::ExprVec(ref exprs) => { try!(self.ibox(indent_unit)); try!(word(&mut self.s, "[")); try!(self.commasep_exprs(Inconsistent, exprs.as_slice())); try!(word(&mut self.s, "]")); try!(self.end()); } ast::ExprRepeat(ref element, ref count) => { try!(self.ibox(indent_unit)); try!(word(&mut self.s, "[")); try!(self.print_expr(&**element)); try!(word(&mut self.s, ",")); try!(word(&mut self.s, "..")); try!(self.print_expr(&**count)); try!(word(&mut self.s, "]")); try!(self.end()); } ast::ExprStruct(ref path, ref fields, ref wth) => { try!(self.print_path(path, true)); try!(word(&mut self.s, "{")); try!(self.commasep_cmnt( Consistent, fields.as_slice(), |s, field| { try!(s.ibox(indent_unit)); try!(s.print_ident(field.ident.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()); } _ => try!(word(&mut self.s, ",")) } try!(word(&mut self.s, "}")); } ast::ExprTup(ref exprs) => { try!(self.popen()); try!(self.commasep_exprs(Inconsistent, exprs.as_slice())); if exprs.len() == 1 { try!(word(&mut self.s, ",")); } try!(self.pclose()); } ast::ExprCall(ref func, ref args) => { try!(self.print_expr_maybe_paren(&**func)); try!(self.print_call_post(args.as_slice())); } ast::ExprMethodCall(ident, ref tys, ref args) => { let base_args = args.slice_from(1); try!(self.print_expr(&*args[0])); try!(word(&mut self.s, ".")); try!(self.print_ident(ident.node)); if tys.len() > 0u { try!(word(&mut self.s, "::<")); try!(self.commasep(Inconsistent, tys.as_slice(), |s, ty| s.print_type(&**ty))); try!(word(&mut self.s, ">")); } try!(self.print_call_post(base_args)); } ast::ExprBinary(op, ref lhs, ref rhs) => { try!(self.print_expr(&**lhs)); try!(space(&mut self.s)); try!(self.word_space(ast_util::binop_to_string(op))); try!(self.print_expr(&**rhs)); } ast::ExprUnary(op, ref expr) => { try!(word(&mut self.s, ast_util::unop_to_string(op))); try!(self.print_expr_maybe_paren(&**expr)); } ast::ExprAddrOf(m, ref expr) => { try!(word(&mut self.s, "&")); try!(self.print_mutability(m)); try!(self.print_expr_maybe_paren(&**expr)); } ast::ExprLit(ref lit) => try!(self.print_literal(&**lit)), ast::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)); } ast::ExprIf(ref test, ref blk, ref elseopt) => { try!(self.print_if(&**test, &**blk, elseopt.as_ref().map(|e| &**e))); } ast::ExprIfLet(ref pat, ref expr, ref blk, ref elseopt) => { try!(self.print_if_let(&**pat, &**expr, &** blk, elseopt.as_ref().map(|e| &**e))); } ast::ExprWhile(ref test, ref blk, opt_ident) => { for ident in opt_ident.iter() { try!(self.print_ident(*ident)); try!(self.word_space(":")); } try!(self.head("while")); try!(self.print_expr(&**test)); try!(space(&mut self.s)); try!(self.print_block(&**blk)); } ast::ExprWhileLet(ref pat, ref expr, ref blk, opt_ident) => { for ident in opt_ident.iter() { try!(self.print_ident(*ident)); try!(self.word_space(":")); } try!(self.head("while 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)); } ast::ExprForLoop(ref pat, ref iter, ref blk, opt_ident) => { for ident in opt_ident.iter() { try!(self.print_ident(*ident)); try!(self.word_space(":")); } try!(self.head("for")); try!(self.print_pat(&**pat)); try!(space(&mut self.s)); try!(self.word_space("in")); try!(self.print_expr(&**iter)); try!(space(&mut self.s)); try!(self.print_block(&**blk)); } ast::ExprLoop(ref blk, opt_ident) => { for ident in opt_ident.iter() { try!(self.print_ident(*ident)); try!(self.word_space(":")); } try!(self.head("loop")); try!(space(&mut self.s)); try!(self.print_block(&**blk)); } ast::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.iter() { try!(self.print_arm(arm)); } try!(self.bclose_(expr.span, indent_unit)); } ast::ExprFnBlock(capture_clause, ref decl, ref body) => { try!(self.print_capture_clause(capture_clause)); // in do/for blocks we don't want to show an empty // argument list, but at this point we don't know which // we are inside. // // if !decl.inputs.is_empty() { try!(self.print_fn_block_args(&**decl, None)); try!(space(&mut self.s)); // } if !body.stmts.is_empty() || !body.expr.is_some() { 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 { ast::ExprBlock(ref blk) => { try!(self.print_block_unclosed(&**blk)); } _ => { // this is a bare expression try!(self.print_expr(&**body.expr.as_ref().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)); } ast::ExprUnboxedFn(capture_clause, kind, ref decl, ref body) => { try!(self.print_capture_clause(capture_clause)); // in do/for blocks we don't want to show an empty // argument list, but at this point we don't know which // we are inside. // // if !decl.inputs.is_empty() { try!(self.print_fn_block_args(&**decl, Some(kind))); try!(space(&mut self.s)); // } if !body.stmts.is_empty() || !body.expr.is_some() { 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 { ast::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)); } ast::ExprProc(ref decl, ref body) => { // in do/for blocks we don't want to show an empty // argument list, but at this point we don't know which // we are inside. // // if !decl.inputs.is_empty() { try!(self.print_proc_args(&**decl)); try!(space(&mut self.s)); // } assert!(body.stmts.is_empty()); assert!(body.expr.is_some()); // we extract the block, so as not to create another set of boxes match body.expr.as_ref().unwrap().node { ast::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)); } ast::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(0u)); try!(self.print_block(&**blk)); } ast::ExprAssign(ref lhs, ref rhs) => { try!(self.print_expr(&**lhs)); try!(space(&mut self.s)); try!(self.word_space("=")); try!(self.print_expr(&**rhs)); } ast::ExprAssignOp(op, ref lhs, ref rhs) => { try!(self.print_expr(&**lhs)); try!(space(&mut self.s)); try!(word(&mut self.s, ast_util::binop_to_string(op))); try!(self.word_space("=")); try!(self.print_expr(&**rhs)); } ast::ExprField(ref expr, id, ref tys) => { try!(self.print_expr(&**expr)); try!(word(&mut self.s, ".")); try!(self.print_ident(id.node)); if tys.len() > 0u { try!(word(&mut self.s, "::<")); try!(self.commasep( Inconsistent, tys.as_slice(), |s, ty| s.print_type(&**ty))); try!(word(&mut self.s, ">")); } } ast::ExprTupField(ref expr, id, ref tys) => { try!(self.print_expr(&**expr)); try!(word(&mut self.s, ".")); try!(self.print_uint(id.node)); if tys.len() > 0u { try!(word(&mut self.s, "::<")); try!(self.commasep( Inconsistent, tys.as_slice(), |s, ty| s.print_type(&**ty))); try!(word(&mut self.s, ">")); } } ast::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, "]")); } ast::ExprSlice(ref e, ref start, ref end, ref mutbl) => { try!(self.print_expr(&**e)); try!(word(&mut self.s, "[")); if mutbl == &ast::MutMutable { try!(word(&mut self.s, "mut")); if start.is_some() || end.is_some() { try!(space(&mut self.s)); } } match start { &Some(ref e) => try!(self.print_expr(&**e)), _ => {} } if start.is_some() || end.is_some() { try!(word(&mut self.s, "..")); } match end { &Some(ref e) => try!(self.print_expr(&**e)), _ => {} } try!(word(&mut self.s, "]")); } ast::ExprPath(ref path) => try!(self.print_path(path, true)), ast::ExprBreak(opt_ident) => { try!(word(&mut self.s, "break")); try!(space(&mut self.s)); for ident in opt_ident.iter() { try!(self.print_ident(*ident)); try!(space(&mut self.s)); } } ast::ExprAgain(opt_ident) => { try!(word(&mut self.s, "continue")); try!(space(&mut self.s)); for ident in opt_ident.iter() { try!(self.print_ident(*ident)); try!(space(&mut self.s)) } } ast::ExprRet(ref result) => { try!(word(&mut self.s, "return")); match *result { Some(ref expr) => { try!(word(&mut self.s, " ")); try!(self.print_expr(&**expr)); } _ => () } } ast::ExprInlineAsm(ref a) => { if a.volatile { try!(word(&mut self.s, "__volatile__ asm!")); } else { try!(word(&mut self.s, "asm!")); } try!(self.popen()); try!(self.print_string(a.asm.get(), a.asm_str_style)); try!(self.word_space(":")); try!(self.commasep(Inconsistent, a.outputs.as_slice(), |s, &(ref co, ref o, is_rw)| { match co.get().slice_shift_char() { (Some('='), operand) if is_rw => { try!(s.print_string(format!("+{}", operand).as_slice(), ast::CookedStr)) } _ => try!(s.print_string(co.get(), 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.inputs.as_slice(), |s, &(ref co, ref o)| { try!(s.print_string(co.get(), 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.print_string(a.clobbers.get(), ast::CookedStr)); try!(self.pclose()); } ast::ExprMac(ref m) => try!(self.print_mac(m)), ast::ExprParen(ref e) => { try!(self.popen()); try!(self.print_expr(&**e)); try!(self.pclose()); } } try!(self.ann.post(self, NodeExpr(expr))); self.end() } pub fn print_local_decl(&mut self, loc: &ast::Local) -> IoResult<()> { try!(self.print_pat(&*loc.pat)); match loc.ty.node { ast::TyInfer => Ok(()), _ => { try!(self.word_space(":")); self.print_type(&*loc.ty) } } } pub fn print_decl(&mut self, decl: &ast::Decl) -> IoResult<()> { try!(self.maybe_print_comment(decl.span.lo)); match decl.node { ast::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()); match loc.init { Some(ref init) => { try!(self.nbsp()); try!(self.word_space("=")); try!(self.print_expr(&**init)); } _ => {} } self.end() } ast::DeclItem(ref item) => self.print_item(&**item) } } pub fn print_ident(&mut self, ident: ast::Ident) -> IoResult<()> { if self.encode_idents_with_hygiene { let encoded = ident.encode_with_hygiene(); try!(word(&mut self.s, encoded.as_slice())) } else { try!(word(&mut self.s, token::get_ident(ident).get())) } self.ann.post(self, NodeIdent(&ident)) } pub fn print_uint(&mut self, i: uint) -> IoResult<()> { word(&mut self.s, i.to_string().as_slice()) } pub fn print_name(&mut self, name: ast::Name) -> IoResult<()> { try!(word(&mut self.s, token::get_name(name).get())); self.ann.post(self, NodeName(&name)) } pub fn print_for_decl(&mut self, loc: &ast::Local, coll: &ast::Expr) -> IoResult<()> { 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: &ast::Path, colons_before_params: bool, opt_bounds: &Option>) -> IoResult<()> { try!(self.maybe_print_comment(path.span.lo)); if path.global { try!(word(&mut self.s, "::")); } let mut first = true; for segment in path.segments.iter() { if first { first = false } else { try!(word(&mut self.s, "::")) } try!(self.print_ident(segment.identifier)); if !segment.lifetimes.is_empty() || !segment.types.is_empty() { if colons_before_params { try!(word(&mut self.s, "::")) } try!(word(&mut self.s, "<")); let mut comma = false; for lifetime in segment.lifetimes.iter() { if comma { try!(self.word_space(",")) } try!(self.print_lifetime(lifetime)); comma = true; } if !segment.types.is_empty() { if comma { try!(self.word_space(",")) } try!(self.commasep( Inconsistent, segment.types.as_slice(), |s, ty| s.print_type(&**ty))); } try!(word(&mut self.s, ">")) } } match *opt_bounds { None => Ok(()), Some(ref bounds) => self.print_bounds("+", bounds) } } fn print_path(&mut self, path: &ast::Path, colons_before_params: bool) -> IoResult<()> { self.print_path_(path, colons_before_params, &None) } fn print_bounded_path(&mut self, path: &ast::Path, bounds: &Option>) -> IoResult<()> { self.print_path_(path, false, bounds) } pub fn print_pat(&mut self, pat: &ast::Pat) -> IoResult<()> { 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 { ast::PatWild(ast::PatWildSingle) => try!(word(&mut self.s, "_")), ast::PatWild(ast::PatWildMulti) => try!(word(&mut self.s, "..")), ast::PatIdent(binding_mode, ref path1, ref sub) => { match binding_mode { ast::BindByRef(mutbl) => { try!(self.word_nbsp("ref")); try!(self.print_mutability(mutbl)); } ast::BindByValue(ast::MutImmutable) => {} ast::BindByValue(ast::MutMutable) => { try!(self.word_nbsp("mut")); } } try!(self.print_ident(path1.node)); match *sub { Some(ref p) => { try!(word(&mut self.s, "@")); try!(self.print_pat(&**p)); } None => () } } ast::PatEnum(ref path, ref args_) => { try!(self.print_path(path, true)); match *args_ { None => try!(word(&mut self.s, "(..)")), Some(ref args) => { if !args.is_empty() { try!(self.popen()); try!(self.commasep(Inconsistent, args.as_slice(), |s, p| s.print_pat(&**p))); try!(self.pclose()); } } } } ast::PatStruct(ref path, ref fields, etc) => { try!(self.print_path(path, true)); try!(self.nbsp()); try!(self.word_space("{")); try!(self.commasep_cmnt( Consistent, fields.as_slice(), |s, f| { try!(s.cbox(indent_unit)); if !f.node.is_shorthand { try!(s.print_ident(f.node.ident)); try!(s.word_nbsp(":")); } try!(s.print_pat(&*f.node.pat)); s.end() }, |f| f.node.pat.span)); if etc { if fields.len() != 0u { try!(self.word_space(",")); } try!(word(&mut self.s, "..")); } try!(space(&mut self.s)); try!(word(&mut self.s, "}")); } ast::PatTup(ref elts) => { try!(self.popen()); try!(self.commasep(Inconsistent, elts.as_slice(), |s, p| s.print_pat(&**p))); if elts.len() == 1 { try!(word(&mut self.s, ",")); } try!(self.pclose()); } ast::PatBox(ref inner) => { try!(word(&mut self.s, "box ")); try!(self.print_pat(&**inner)); } ast::PatRegion(ref inner) => { try!(word(&mut self.s, "&")); try!(self.print_pat(&**inner)); } ast::PatLit(ref e) => try!(self.print_expr(&**e)), ast::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)); } ast::PatVec(ref before, ref slice, ref after) => { try!(word(&mut self.s, "[")); try!(self.commasep(Inconsistent, before.as_slice(), |s, p| s.print_pat(&**p))); for p in slice.iter() { if !before.is_empty() { try!(self.word_space(",")); } try!(self.print_pat(&**p)); match **p { ast::Pat { node: ast::PatWild(ast::PatWildMulti), .. } => { // this case is handled by print_pat } _ => try!(word(&mut self.s, "..")), } if !after.is_empty() { try!(self.word_space(",")); } } try!(self.commasep(Inconsistent, after.as_slice(), |s, p| s.print_pat(&**p))); try!(word(&mut self.s, "]")); } ast::PatMac(ref m) => try!(self.print_mac(m)), } self.ann.post(self, NodePat(pat)) } fn print_arm(&mut self, arm: &ast::Arm) -> IoResult<()> { // 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(0u)); try!(self.print_outer_attributes(arm.attrs.as_slice())); let mut first = true; for p in arm.pats.iter() { if first { first = false; } else { try!(space(&mut self.s)); try!(self.word_space("|")); } try!(self.print_pat(&**p)); } try!(space(&mut self.s)); match arm.guard { Some(ref e) => { try!(self.word_space("if")); try!(self.print_expr(&**e)); try!(space(&mut self.s)); } None => () } try!(self.word_space("=>")); match arm.body.node { ast::ExprBlock(ref blk) => { // the block will close the pattern's ibox try!(self.print_block_unclosed_indent(&**blk, indent_unit)); } _ => { 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: &ast::ExplicitSelf_, mutbl: ast::Mutability) -> IoResult { try!(self.print_mutability(mutbl)); match *explicit_self { ast::SelfStatic => { return Ok(false); } ast::SelfValue(_) => { try!(word(&mut self.s, "self")); } ast::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")); } ast::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: &ast::FnDecl, fn_style: Option, abi: abi::Abi, name: ast::Ident, generics: &ast::Generics, opt_explicit_self: Option<&ast::ExplicitSelf_>, vis: ast::Visibility) -> IoResult<()> { try!(self.head("")); try!(self.print_fn_header_info(opt_explicit_self, fn_style, abi, vis)); try!(self.nbsp()); try!(self.print_ident(name)); try!(self.print_generics(generics)); try!(self.print_fn_args_and_ret(decl, opt_explicit_self)) self.print_where_clause(generics) } pub fn print_fn_args(&mut self, decl: &ast::FnDecl, opt_explicit_self: Option<&ast::ExplicitSelf_>) -> IoResult<()> { // 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(0u, Inconsistent)); let mut first = true; for &explicit_self in opt_explicit_self.iter() { let m = match explicit_self { &ast::SelfStatic => ast::MutImmutable, _ => match decl.inputs[0].pat.node { ast::PatIdent(ast::BindByValue(m), _, _) => m, _ => ast::MutImmutable } }; first = !try!(self.print_explicit_self(explicit_self, m)); } // HACK(eddyb) ignore the separately printed self argument. let args = if first { decl.inputs.as_slice() } else { decl.inputs.slice_from(1) }; for arg in args.iter() { 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: &ast::FnDecl, opt_explicit_self: Option<&ast::ExplicitSelf_>) -> IoResult<()> { try!(self.popen()); try!(self.print_fn_args(decl, opt_explicit_self)); if decl.variadic { try!(word(&mut self.s, ", ...")); } try!(self.pclose()); try!(self.maybe_print_comment(decl.output.span.lo)); match decl.output.node { ast::TyNil => Ok(()), _ => { try!(self.space_if_not_bol()); try!(self.word_space("->")); self.print_type(&*decl.output) } } } pub fn print_fn_block_args( &mut self, decl: &ast::FnDecl, unboxed_closure_kind: Option) -> IoResult<()> { try!(word(&mut self.s, "|")); match unboxed_closure_kind { None => {} Some(FnUnboxedClosureKind) => try!(self.word_space("&:")), Some(FnMutUnboxedClosureKind) => try!(self.word_space("&mut:")), Some(FnOnceUnboxedClosureKind) => try!(self.word_space(":")), } try!(self.print_fn_args(decl, None)); try!(word(&mut self.s, "|")); match decl.output.node { ast::TyInfer => {} _ => { try!(self.space_if_not_bol()); try!(self.word_space("->")); try!(self.print_type(&*decl.output)); } } self.maybe_print_comment(decl.output.span.lo) } pub fn print_capture_clause(&mut self, capture_clause: ast::CaptureClause) -> IoResult<()> { match capture_clause { ast::CaptureByValue => self.word_space("move"), ast::CaptureByRef => Ok(()), } } pub fn print_proc_args(&mut self, decl: &ast::FnDecl) -> IoResult<()> { try!(word(&mut self.s, "proc")); try!(word(&mut self.s, "(")); try!(self.print_fn_args(decl, None)); try!(word(&mut self.s, ")")); match decl.output.node { ast::TyInfer => {} _ => { try!(self.space_if_not_bol()); try!(self.word_space("->")); try!(self.print_type(&*decl.output)); } } self.maybe_print_comment(decl.output.span.lo) } pub fn print_bounds(&mut self, prefix: &str, bounds: &OwnedSlice) -> IoResult<()> { if !bounds.is_empty() { try!(word(&mut self.s, prefix)); let mut first = true; for bound in bounds.iter() { try!(self.nbsp()); if first { first = false; } else { try!(self.word_space("+")); } try!(match *bound { TraitTyParamBound(ref tref) => { self.print_trait_ref(tref) } RegionTyParamBound(ref lt) => { self.print_lifetime(lt) } UnboxedFnTyParamBound(ref unboxed_function_type) => { try!(self.print_path(&unboxed_function_type.path, false)); try!(self.popen()); try!(self.print_fn_args(&*unboxed_function_type.decl, None)); try!(self.pclose()); self.print_fn_output(&*unboxed_function_type.decl) } }) } Ok(()) } else { Ok(()) } } pub fn print_lifetime(&mut self, lifetime: &ast::Lifetime) -> IoResult<()> { self.print_name(lifetime.name) } pub fn print_lifetime_def(&mut self, lifetime: &ast::LifetimeDef) -> IoResult<()> { try!(self.print_lifetime(&lifetime.lifetime)); let mut sep = ":"; for v in lifetime.bounds.iter() { try!(word(&mut self.s, sep)); try!(self.print_lifetime(v)); sep = "+"; } Ok(()) } pub fn print_generics(&mut self, generics: &ast::Generics) -> IoResult<()> { 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 range(0u, total) { ints.push(i); } try!(self.commasep(Inconsistent, ints.as_slice(), |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.get(idx); match param.unbound { Some(TraitTyParamBound(ref tref)) => { try!(s.print_trait_ref(tref)); try!(s.word_space("?")); } _ => {} } try!(s.print_ident(param.ident)); try!(s.print_bounds(":", ¶m.bounds)); match param.default { Some(ref default) => { try!(space(&mut s.s)); try!(s.word_space("=")); s.print_type(&**default) } _ => Ok(()) } } })); try!(word(&mut self.s, ">")); Ok(()) } pub fn print_where_clause(&mut self, generics: &ast::Generics) -> IoResult<()> { if generics.where_clause.predicates.len() == 0 { return Ok(()) } try!(space(&mut self.s)); try!(self.word_space("where")); for (i, predicate) in generics.where_clause .predicates .iter() .enumerate() { if i != 0 { try!(self.word_space(",")); } try!(self.print_ident(predicate.ident)); try!(self.print_bounds(":", &predicate.bounds)); } Ok(()) } pub fn print_meta_item(&mut self, item: &ast::MetaItem) -> IoResult<()> { try!(self.ibox(indent_unit)); match item.node { ast::MetaWord(ref name) => { try!(word(&mut self.s, name.get())); } ast::MetaNameValue(ref name, ref value) => { try!(self.word_space(name.get())); try!(self.word_space("=")); try!(self.print_literal(value)); } ast::MetaList(ref name, ref items) => { try!(word(&mut self.s, name.get())); try!(self.popen()); try!(self.commasep(Consistent, items.as_slice(), |s, i| s.print_meta_item(&**i))); try!(self.pclose()); } } self.end() } pub fn print_view_path(&mut self, vp: &ast::ViewPath) -> IoResult<()> { match vp.node { ast::ViewPathSimple(ident, ref path, _) => { try!(self.print_path(path, false)); // FIXME(#6993) can't compare identifiers directly here if path.segments.last().unwrap().identifier.name != ident.name { try!(space(&mut self.s)); try!(self.word_space("as")); try!(self.print_ident(ident)); } Ok(()) } ast::ViewPathGlob(ref path, _) => { try!(self.print_path(path, false)); word(&mut self.s, "::*") } ast::ViewPathList(ref path, ref idents, _) => { if path.segments.is_empty() { try!(word(&mut self.s, "{")); } else { try!(self.print_path(path, false)); try!(word(&mut self.s, "::{")); } try!(self.commasep(Inconsistent, idents.as_slice(), |s, w| { match w.node { ast::PathListIdent { name, .. } => { s.print_ident(name) }, ast::PathListMod { .. } => { word(&mut s.s, "mod") } } })); word(&mut self.s, "}") } } } pub fn print_view_item(&mut self, item: &ast::ViewItem) -> IoResult<()> { try!(self.hardbreak_if_not_bol()); try!(self.maybe_print_comment(item.span.lo)); try!(self.print_outer_attributes(item.attrs.as_slice())); try!(self.print_visibility(item.vis)); match item.node { ast::ViewItemExternCrate(id, ref optional_path, _) => { try!(self.head("extern crate")); for &(ref p, style) in optional_path.iter() { try!(self.print_string(p.get(), style)); try!(space(&mut self.s)); try!(word(&mut self.s, "as")); try!(space(&mut self.s)); } try!(self.print_ident(id)); } ast::ViewItemUse(ref vp) => { try!(self.head("use")); try!(self.print_view_path(&**vp)); } } try!(word(&mut self.s, ";")); try!(self.end()); // end inner head-block self.end() // end outer head-block } pub fn print_mutability(&mut self, mutbl: ast::Mutability) -> IoResult<()> { match mutbl { ast::MutMutable => self.word_nbsp("mut"), ast::MutImmutable => Ok(()), } } pub fn print_mt(&mut self, mt: &ast::MutTy) -> IoResult<()> { try!(self.print_mutability(mt.mutbl)); self.print_type(&*mt.ty) } pub fn print_arg(&mut self, input: &ast::Arg) -> IoResult<()> { try!(self.ibox(indent_unit)); match input.ty.node { ast::TyInfer => try!(self.print_pat(&*input.pat)), _ => { match input.pat.node { ast::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: &ast::FnDecl) -> IoResult<()> { match decl.output.node { ast::TyNil => Ok(()), _ => { try!(self.space_if_not_bol()); try!(self.ibox(indent_unit)); try!(self.word_space("->")); if decl.cf == ast::NoReturn { try!(self.word_nbsp("!")); } else { try!(self.print_type(&*decl.output)); } self.end() } } } pub fn print_ty_fn(&mut self, opt_abi: Option, opt_sigil: Option, fn_style: ast::FnStyle, onceness: ast::Onceness, decl: &ast::FnDecl, id: Option, bounds: &OwnedSlice, generics: Option<&ast::Generics>, opt_explicit_self: Option<&ast::ExplicitSelf_>, opt_unboxed_closure_kind: Option) -> IoResult<()> { try!(self.ibox(indent_unit)); // Duplicates the logic in `print_fn_header_info()`. This is because that // function prints the sigil in the wrong place. That should be fixed. if opt_sigil == Some('~') && onceness == ast::Once { try!(word(&mut self.s, "proc")); } else if opt_sigil == Some('&') { try!(self.print_fn_style(fn_style)); try!(self.print_extern_opt_abi(opt_abi)); try!(self.print_onceness(onceness)); } else { assert!(opt_sigil.is_none()); try!(self.print_fn_style(fn_style)); try!(self.print_opt_abi_and_extern_if_nondefault(opt_abi)); try!(self.print_onceness(onceness)); if opt_unboxed_closure_kind.is_none() { try!(word(&mut self.s, "fn")); } } match id { Some(id) => { try!(word(&mut self.s, " ")); try!(self.print_ident(id)); } _ => () } match generics { Some(g) => try!(self.print_generics(g)), _ => () } try!(zerobreak(&mut self.s)); if opt_unboxed_closure_kind.is_some() || opt_sigil == Some('&') { try!(word(&mut self.s, "|")); } else { try!(self.popen()); } match opt_unboxed_closure_kind { Some(ast::FnUnboxedClosureKind) => { try!(word(&mut self.s, "&")); try!(self.word_space(":")); } Some(ast::FnMutUnboxedClosureKind) => { try!(word(&mut self.s, "&mut")); try!(self.word_space(":")); } Some(ast::FnOnceUnboxedClosureKind) => { try!(self.word_space(":")); } None => {} } try!(self.print_fn_args(decl, opt_explicit_self)); if opt_unboxed_closure_kind.is_some() || opt_sigil == Some('&') { try!(word(&mut self.s, "|")); } else { if decl.variadic { try!(word(&mut self.s, ", ...")); } try!(self.pclose()); } try!(self.print_bounds(":", bounds)); try!(self.maybe_print_comment(decl.output.span.lo)); try!(self.print_fn_output(decl)); match generics { Some(generics) => try!(self.print_where_clause(generics)), None => {} } self.end() } pub fn maybe_print_trailing_comment(&mut self, span: codemap::Span, next_pos: Option) -> IoResult<()> { 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 += 1u; } } _ => () } Ok(()) } pub fn print_remaining_comments(&mut self) -> IoResult<()> { // 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 += 1u; } _ => break } } Ok(()) } pub fn print_literal(&mut self, lit: &ast::Lit) -> IoResult<()> { try!(self.maybe_print_comment(lit.span.lo)); match self.next_lit(lit.span.lo) { Some(ref ltrl) => { return word(&mut self.s, (*ltrl).lit.as_slice()); } _ => () } match lit.node { ast::LitStr(ref st, style) => self.print_string(st.get(), style), ast::LitByte(byte) => { let mut res = String::from_str("b'"); (byte as char).escape_default(|c| res.push(c)); res.push('\''); word(&mut self.s, res.as_slice()) } ast::LitChar(ch) => { let mut res = String::from_str("'"); ch.escape_default(|c| res.push(c)); res.push('\''); word(&mut self.s, res.as_slice()) } ast::LitInt(i, t) => { match t { ast::SignedIntLit(st, ast::Plus) => { word(&mut self.s, ast_util::int_ty_to_string(st, Some(i as i64)).as_slice()) } ast::SignedIntLit(st, ast::Minus) => { let istr = ast_util::int_ty_to_string(st, Some(-(i as i64))); word(&mut self.s, format!("-{}", istr).as_slice()) } ast::UnsignedIntLit(ut) => { word(&mut self.s, ast_util::uint_ty_to_string(ut, Some(i)).as_slice()) } ast::UnsuffixedIntLit(ast::Plus) => { word(&mut self.s, format!("{}", i).as_slice()) } ast::UnsuffixedIntLit(ast::Minus) => { word(&mut self.s, format!("-{}", i).as_slice()) } } } ast::LitFloat(ref f, t) => { word(&mut self.s, format!( "{}{}", f.get(), ast_util::float_ty_to_string(t).as_slice()).as_slice()) } ast::LitFloatUnsuffixed(ref f) => word(&mut self.s, f.get()), ast::LitNil => word(&mut self.s, "()"), ast::LitBool(val) => { if val { word(&mut self.s, "true") } else { word(&mut self.s, "false") } } ast::LitBinary(ref v) => { let escaped: String = v.iter().map(|&b| b as char).collect(); word(&mut self.s, format!("b\"{}\"", escaped.escape_default()).as_slice()) } } } pub fn next_lit(&mut self, pos: BytePos) -> Option { match self.literals { Some(ref lits) => { while self.cur_cmnt_and_lit.cur_lit < lits.len() { let ltrl = (*lits)[self.cur_cmnt_and_lit.cur_lit].clone(); if ltrl.pos > pos { return None; } self.cur_cmnt_and_lit.cur_lit += 1u; if ltrl.pos == pos { return Some(ltrl); } } None } _ => None } } pub fn maybe_print_comment(&mut self, pos: BytePos) -> IoResult<()> { loop { match self.next_comment() { Some(ref cmnt) => { if (*cmnt).pos < pos { try!(self.print_comment(cmnt)); self.cur_cmnt_and_lit.cur_cmnt += 1u; } else { break; } } _ => break } } Ok(()) } pub fn print_comment(&mut self, cmnt: &comments::Comment) -> IoResult<()> { match cmnt.style { comments::Mixed => { assert_eq!(cmnt.lines.len(), 1u); try!(zerobreak(&mut self.s)); try!(word(&mut self.s, cmnt.lines[0].as_slice())); zerobreak(&mut self.s) } comments::Isolated => { try!(self.hardbreak_if_not_bol()); for line in cmnt.lines.iter() { // Don't print empty lines because they will end up as trailing // whitespace if !line.is_empty() { try!(word(&mut self.s, line.as_slice())); } try!(hardbreak(&mut self.s)); } Ok(()) } comments::Trailing => { try!(word(&mut self.s, " ")); if cmnt.lines.len() == 1u { try!(word(&mut self.s, cmnt.lines[0].as_slice())); hardbreak(&mut self.s) } else { try!(self.ibox(0u)); for line in cmnt.lines.iter() { if !line.is_empty() { try!(word(&mut self.s, line.as_slice())); } try!(hardbreak(&mut self.s)); } self.end() } } comments::BlankLine => { // We need to do at least one, possibly two hardbreaks. let is_semi = match self.s.last_token() { pp::String(s, _) => ";" == s.as_slice(), _ => false }; if is_semi || self.is_begin() || self.is_end() { try!(hardbreak(&mut self.s)); } hardbreak(&mut self.s) } } } pub fn print_string(&mut self, st: &str, style: ast::StrStyle) -> IoResult<()> { let st = match style { ast::CookedStr => { (format!("\"{}\"", st.escape_default())) } ast::RawStr(n) => { (format!("r{delim}\"{string}\"{delim}", delim="#".repeat(n), string=st)) } }; word(&mut self.s, st.as_slice()) } pub fn next_comment(&mut self) -> Option { match self.comments { Some(ref cmnts) => { if self.cur_cmnt_and_lit.cur_cmnt < cmnts.len() { Some(cmnts[self.cur_cmnt_and_lit.cur_cmnt].clone()) } else { None } } _ => None } } pub fn print_opt_fn_style(&mut self, opt_fn_style: Option) -> IoResult<()> { match opt_fn_style { Some(fn_style) => self.print_fn_style(fn_style), None => Ok(()) } } pub fn print_opt_abi_and_extern_if_nondefault(&mut self, opt_abi: Option) -> IoResult<()> { match opt_abi { Some(abi::Rust) => Ok(()), Some(abi) => { try!(self.word_nbsp("extern")); self.word_nbsp(abi.to_string().as_slice()) } None => Ok(()) } } pub fn print_extern_opt_abi(&mut self, opt_abi: Option) -> IoResult<()> { match opt_abi { Some(abi) => { try!(self.word_nbsp("extern")); self.word_nbsp(abi.to_string().as_slice()) } None => Ok(()) } } pub fn print_fn_header_info(&mut self, _opt_explicit_self: Option<&ast::ExplicitSelf_>, opt_fn_style: Option, abi: abi::Abi, vis: ast::Visibility) -> IoResult<()> { try!(word(&mut self.s, visibility_qualified(vis, "").as_slice())); try!(self.print_opt_fn_style(opt_fn_style)); if abi != abi::Rust { try!(self.word_nbsp("extern")); try!(self.word_nbsp(abi.to_string().as_slice())); } word(&mut self.s, "fn") } pub fn print_fn_style(&mut self, s: ast::FnStyle) -> IoResult<()> { match s { ast::NormalFn => Ok(()), ast::UnsafeFn => self.word_nbsp("unsafe"), } } pub fn print_onceness(&mut self, o: ast::Onceness) -> IoResult<()> { match o { ast::Once => self.word_nbsp("once"), ast::Many => Ok(()) } } } #[cfg(test)] mod test { use super::*; use ast; use ast_util; use codemap; use parse::token; use ptr::P; #[test] fn test_fun_to_string() { let abba_ident = token::str_to_ident("abba"); let decl = ast::FnDecl { inputs: Vec::new(), output: P(ast::Ty {id: 0, node: ast::TyNil, span: codemap::DUMMY_SP}), cf: ast::Return, variadic: false }; let generics = ast_util::empty_generics(); assert_eq!(&fun_to_string(&decl, ast::NormalFn, abba_ident, None, &generics), &"fn abba()".to_string()); } #[test] fn test_variant_to_string() { let ident = token::str_to_ident("principal_skinner"); let var = codemap::respan(codemap::DUMMY_SP, ast::Variant_ { name: ident, attrs: Vec::new(), // making this up as I go.... ? kind: ast::TupleVariantKind(Vec::new()), id: 0, disr_expr: None, vis: ast::Public, }); let varstr = variant_to_string(&var); assert_eq!(&varstr,&"pub principal_skinner".to_string()); } #[test] fn test_signed_int_to_string() { let pos_int = ast::LitInt(42, ast::SignedIntLit(ast::TyI32, ast::Plus)); let neg_int = ast::LitInt((-42) as u64, ast::SignedIntLit(ast::TyI32, ast::Minus)); assert_eq!(format!("-{}", lit_to_string(&codemap::dummy_spanned(pos_int))), lit_to_string(&codemap::dummy_spanned(neg_int))); } }