| // 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 <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 rustc_target::spec::abi::{self, Abi}; |
| use ast::{self, BlockCheckMode, PatKind, RangeEnd, RangeSyntax}; |
| use ast::{SelfKind, GenericBound, TraitBoundModifier}; |
| use ast::{Attribute, MacDelimiter, GenericArg}; |
| use util::parser::{self, AssocOp, Fixity}; |
| use attr; |
| use codemap::{self, CodeMap, Spanned}; |
| use syntax_pos::{self, BytePos}; |
| use syntax_pos::hygiene::{Mark, SyntaxContext}; |
| use parse::token::{self, BinOpToken, Token}; |
| use parse::lexer::comments; |
| use parse::{self, ParseSess}; |
| use print::pp::{self, Breaks}; |
| use print::pp::Breaks::{Consistent, Inconsistent}; |
| use ptr::P; |
| use std_inject; |
| use symbol::keywords; |
| use syntax_pos::{DUMMY_SP, FileName}; |
| use tokenstream::{self, TokenStream, TokenTree}; |
| |
| use std::ascii; |
| use std::io::{self, Write, Read}; |
| use std::iter::Peekable; |
| use std::vec; |
| |
| pub enum AnnNode<'a> { |
| NodeIdent(&'a ast::Ident), |
| NodeName(&'a ast::Name), |
| NodeBlock(&'a ast::Block), |
| NodeItem(&'a ast::Item), |
| NodeSubItem(ast::NodeId), |
| NodeExpr(&'a ast::Expr), |
| NodePat(&'a ast::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> { |
| pub s: pp::Printer<'a>, |
| cm: Option<&'a CodeMap>, |
| comments: Option<Vec<comments::Comment> >, |
| literals: Peekable<vec::IntoIter<comments::Literal>>, |
| cur_cmnt: usize, |
| boxes: Vec<pp::Breaks>, |
| ann: &'a (dyn PpAnn+'a), |
| } |
| |
| fn rust_printer<'a>(writer: Box<dyn Write+'a>, ann: &'a dyn PpAnn) -> State<'a> { |
| State { |
| s: pp::mk_printer(writer, DEFAULT_COLUMNS), |
| cm: None, |
| comments: None, |
| literals: vec![].into_iter().peekable(), |
| cur_cmnt: 0, |
| boxes: Vec::new(), |
| ann, |
| } |
| } |
| |
| pub const INDENT_UNIT: usize = 4; |
| |
| 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, |
| sess: &ParseSess, |
| krate: &ast::Crate, |
| filename: FileName, |
| input: &mut dyn Read, |
| out: Box<dyn Write+'a>, |
| ann: &'a dyn PpAnn, |
| is_expanded: bool) -> io::Result<()> { |
| let mut s = State::new_from_input(cm, sess, filename, input, out, ann, is_expanded); |
| |
| if is_expanded && std_inject::injected_crate_name().is_some() { |
| // We need to print `#![no_std]` (and its feature gate) so that |
| // compiling pretty-printed source won't inject libstd again. |
| // However we don't want these attributes in the AST because |
| // of the feature gate, so we fake them up here. |
| |
| // #![feature(prelude_import)] |
| let pi_nested = attr::mk_nested_word_item(ast::Ident::from_str("prelude_import")); |
| let list = attr::mk_list_item(DUMMY_SP, ast::Ident::from_str("feature"), vec![pi_nested]); |
| let fake_attr = attr::mk_attr_inner(DUMMY_SP, attr::mk_attr_id(), list); |
| s.print_attribute(&fake_attr)?; |
| |
| // #![no_std] |
| let no_std_meta = attr::mk_word_item(ast::Ident::from_str("no_std")); |
| let fake_attr = attr::mk_attr_inner(DUMMY_SP, attr::mk_attr_id(), no_std_meta); |
| s.print_attribute(&fake_attr)?; |
| } |
| |
| s.print_mod(&krate.module, &krate.attrs)?; |
| s.print_remaining_comments()?; |
| s.s.eof() |
| } |
| |
| impl<'a> State<'a> { |
| pub fn new_from_input(cm: &'a CodeMap, |
| sess: &ParseSess, |
| filename: FileName, |
| input: &mut dyn Read, |
| out: Box<dyn Write+'a>, |
| ann: &'a dyn PpAnn, |
| is_expanded: bool) -> State<'a> { |
| let (cmnts, lits) = comments::gather_comments_and_literals(sess, 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<dyn Write+'a>, |
| ann: &'a dyn PpAnn, |
| comments: Option<Vec<comments::Comment>>, |
| literals: Option<Vec<comments::Literal>>) -> State<'a> { |
| State { |
| s: pp::mk_printer(out, DEFAULT_COLUMNS), |
| cm: Some(cm), |
| comments, |
| literals: literals.unwrap_or_default().into_iter().peekable(), |
| cur_cmnt: 0, |
| boxes: Vec::new(), |
| ann, |
| } |
| } |
| } |
| |
| pub fn to_string<F>(f: F) -> String where |
| F: FnOnce(&mut State) -> io::Result<()>, |
| { |
| let mut wr = Vec::new(); |
| { |
| let ann = NoAnn; |
| let mut printer = rust_printer(Box::new(&mut wr), &ann); |
| f(&mut printer).unwrap(); |
| printer.s.eof().unwrap(); |
| } |
| String::from_utf8(wr).unwrap() |
| } |
| |
| 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 => "=".to_string(), |
| token::Lt => "<".to_string(), |
| token::Le => "<=".to_string(), |
| token::EqEq => "==".to_string(), |
| token::Ne => "!=".to_string(), |
| token::Ge => ">=".to_string(), |
| token::Gt => ">".to_string(), |
| token::Not => "!".to_string(), |
| token::Tilde => "~".to_string(), |
| token::OrOr => "||".to_string(), |
| token::AndAnd => "&&".to_string(), |
| token::BinOp(op) => binop_to_string(op).to_string(), |
| token::BinOpEq(op) => format!("{}=", binop_to_string(op)), |
| |
| /* Structural symbols */ |
| token::At => "@".to_string(), |
| token::Dot => ".".to_string(), |
| token::DotDot => "..".to_string(), |
| token::DotDotDot => "...".to_string(), |
| token::DotDotEq => "..=".to_string(), |
| token::DotEq => ".=".to_string(), |
| token::Comma => ",".to_string(), |
| token::Semi => ";".to_string(), |
| token::Colon => ":".to_string(), |
| token::ModSep => "::".to_string(), |
| token::RArrow => "->".to_string(), |
| token::LArrow => "<-".to_string(), |
| token::FatArrow => "=>".to_string(), |
| token::OpenDelim(token::Paren) => "(".to_string(), |
| token::CloseDelim(token::Paren) => ")".to_string(), |
| token::OpenDelim(token::Bracket) => "[".to_string(), |
| token::CloseDelim(token::Bracket) => "]".to_string(), |
| token::OpenDelim(token::Brace) => "{".to_string(), |
| token::CloseDelim(token::Brace) => "}".to_string(), |
| token::OpenDelim(token::NoDelim) | |
| token::CloseDelim(token::NoDelim) => " ".to_string(), |
| token::Pound => "#".to_string(), |
| token::Dollar => "$".to_string(), |
| token::Question => "?".to_string(), |
| token::SingleQuote => "'".to_string(), |
| |
| /* Literals */ |
| token::Literal(lit, suf) => { |
| let mut out = match lit { |
| token::Byte(b) => format!("b'{}'", b), |
| token::Char(c) => format!("'{}'", c), |
| token::Float(c) | |
| token::Integer(c) => c.to_string(), |
| token::Str_(s) => format!("\"{}\"", s), |
| token::StrRaw(s, n) => format!("r{delim}\"{string}\"{delim}", |
| delim="#".repeat(n as usize), |
| string=s), |
| token::ByteStr(v) => format!("b\"{}\"", v), |
| token::ByteStrRaw(s, n) => format!("br{delim}\"{string}\"{delim}", |
| delim="#".repeat(n as usize), |
| string=s), |
| }; |
| |
| if let Some(s) = suf { |
| out.push_str(&s.as_str()) |
| } |
| |
| out |
| } |
| |
| /* Name components */ |
| token::Ident(s, false) => s.to_string(), |
| token::Ident(s, true) => format!("r#{}", s), |
| token::Lifetime(s) => s.to_string(), |
| |
| /* Other */ |
| token::DocComment(s) => s.to_string(), |
| token::Eof => "<eof>".to_string(), |
| token::Whitespace => " ".to_string(), |
| token::Comment => "/* */".to_string(), |
| token::Shebang(s) => format!("/* shebang: {}*/", s), |
| |
| token::Interpolated(ref nt) => match nt.0 { |
| 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(ref e) => item_to_string(e), |
| token::NtBlock(ref e) => block_to_string(e), |
| token::NtStmt(ref e) => stmt_to_string(e), |
| token::NtPat(ref e) => pat_to_string(e), |
| token::NtIdent(e, false) => ident_to_string(e), |
| token::NtIdent(e, true) => format!("r#{}", ident_to_string(e)), |
| token::NtLifetime(e) => ident_to_string(e), |
| token::NtLiteral(ref e) => expr_to_string(e), |
| token::NtTT(ref tree) => tt_to_string(tree.clone()), |
| token::NtArm(ref e) => arm_to_string(e), |
| token::NtImplItem(ref e) => impl_item_to_string(e), |
| token::NtTraitItem(ref e) => trait_item_to_string(e), |
| token::NtGenerics(ref e) => generic_params_to_string(&e.params), |
| token::NtWhereClause(ref e) => where_clause_to_string(e), |
| token::NtArg(ref e) => arg_to_string(e), |
| token::NtVis(ref e) => vis_to_string(e), |
| token::NtForeignItem(ref e) => foreign_item_to_string(e), |
| } |
| } |
| } |
| |
| pub fn ty_to_string(ty: &ast::Ty) -> String { |
| to_string(|s| s.print_type(ty)) |
| } |
| |
| pub fn bounds_to_string(bounds: &[ast::GenericBound]) -> String { |
| to_string(|s| s.print_type_bounds("", bounds)) |
| } |
| |
| 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(lt: &ast::Lifetime) -> String { |
| to_string(|s| s.print_lifetime(*lt)) |
| } |
| |
| pub fn tt_to_string(tt: tokenstream::TokenTree) -> String { |
| to_string(|s| s.print_tt(tt)) |
| } |
| |
| pub fn tts_to_string(tts: &[tokenstream::TokenTree]) -> String { |
| to_string(|s| s.print_tts(tts.iter().cloned().collect())) |
| } |
| |
| pub fn tokens_to_string(tokens: TokenStream) -> String { |
| to_string(|s| s.print_tts(tokens)) |
| } |
| |
| pub fn stmt_to_string(stmt: &ast::Stmt) -> String { |
| to_string(|s| s.print_stmt(stmt)) |
| } |
| |
| pub fn attr_to_string(attr: &ast::Attribute) -> String { |
| to_string(|s| s.print_attribute(attr)) |
| } |
| |
| pub fn item_to_string(i: &ast::Item) -> String { |
| to_string(|s| s.print_item(i)) |
| } |
| |
| pub fn impl_item_to_string(i: &ast::ImplItem) -> String { |
| to_string(|s| s.print_impl_item(i)) |
| } |
| |
| pub fn trait_item_to_string(i: &ast::TraitItem) -> String { |
| to_string(|s| s.print_trait_item(i)) |
| } |
| |
| pub fn generic_params_to_string(generic_params: &[ast::GenericParam]) -> String { |
| to_string(|s| s.print_generic_params(generic_params)) |
| } |
| |
| pub fn where_clause_to_string(i: &ast::WhereClause) -> String { |
| to_string(|s| s.print_where_clause(i)) |
| } |
| |
| pub fn fn_block_to_string(p: &ast::FnDecl) -> String { |
| to_string(|s| s.print_fn_block_args(p)) |
| } |
| |
| pub fn path_to_string(p: &ast::Path) -> String { |
| to_string(|s| s.print_path(p, false, 0)) |
| } |
| |
| pub fn path_segment_to_string(p: &ast::PathSegment) -> String { |
| to_string(|s| s.print_path_segment(p, false)) |
| } |
| |
| pub fn ident_to_string(id: ast::Ident) -> String { |
| to_string(|s| s.print_ident(id)) |
| } |
| |
| pub fn vis_to_string(v: &ast::Visibility) -> String { |
| to_string(|s| s.print_visibility(v)) |
| } |
| |
| pub fn fun_to_string(decl: &ast::FnDecl, |
| header: ast::FnHeader, |
| name: ast::Ident, |
| generics: &ast::Generics) |
| -> String { |
| to_string(|s| { |
| s.head("")?; |
| s.print_fn(decl, header, Some(name), |
| generics, &codemap::dummy_spanned(ast::VisibilityKind::Inherited))?; |
| 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 } |
| s.cbox(INDENT_UNIT)?; |
| // head-ibox, will be closed by print-block after { |
| s.ibox(0)?; |
| s.print_block(blk) |
| }) |
| } |
| |
| pub fn meta_list_item_to_string(li: &ast::NestedMetaItem) -> String { |
| to_string(|s| s.print_meta_list_item(li)) |
| } |
| |
| 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 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, false)) |
| } |
| |
| pub fn mac_to_string(arg: &ast::Mac) -> String { |
| to_string(|s| s.print_mac(arg)) |
| } |
| |
| pub fn foreign_item_to_string(arg: &ast::ForeignItem) -> String { |
| to_string(|s| s.print_foreign_item(arg)) |
| } |
| |
| pub fn visibility_qualified(vis: &ast::Visibility, s: &str) -> String { |
| format!("{}{}", to_string(|s| s.print_visibility(vis)), s) |
| } |
| |
| pub trait PrintState<'a> { |
| fn writer(&mut self) -> &mut pp::Printer<'a>; |
| fn boxes(&mut self) -> &mut Vec<pp::Breaks>; |
| fn comments(&mut self) -> &mut Option<Vec<comments::Comment>>; |
| fn cur_cmnt(&mut self) -> &mut usize; |
| fn cur_lit(&mut self) -> Option<&comments::Literal>; |
| fn bump_lit(&mut self) -> Option<comments::Literal>; |
| |
| fn word_space(&mut self, w: &str) -> io::Result<()> { |
| self.writer().word(w)?; |
| self.writer().space() |
| } |
| |
| fn popen(&mut self) -> io::Result<()> { self.writer().word("(") } |
| |
| fn pclose(&mut self) -> io::Result<()> { self.writer().word(")") } |
| |
| fn is_begin(&mut self) -> bool { |
| match self.writer().last_token() { |
| pp::Token::Begin(_) => true, |
| _ => false, |
| } |
| } |
| |
| fn is_end(&mut self) -> bool { |
| match self.writer().last_token() { |
| pp::Token::End => true, |
| _ => false, |
| } |
| } |
| |
| // is this the beginning of a line? |
| fn is_bol(&mut self) -> bool { |
| self.writer().last_token().is_eof() || self.writer().last_token().is_hardbreak_tok() |
| } |
| |
| fn hardbreak_if_not_bol(&mut self) -> io::Result<()> { |
| if !self.is_bol() { |
| self.writer().hardbreak()? |
| } |
| Ok(()) |
| } |
| |
| // "raw box" |
| fn rbox(&mut self, u: usize, b: pp::Breaks) -> io::Result<()> { |
| self.boxes().push(b); |
| self.writer().rbox(u, b) |
| } |
| |
| fn ibox(&mut self, u: usize) -> io::Result<()> { |
| self.boxes().push(pp::Breaks::Inconsistent); |
| self.writer().ibox(u) |
| } |
| |
| fn end(&mut self) -> io::Result<()> { |
| self.boxes().pop().unwrap(); |
| self.writer().end() |
| } |
| |
| fn commasep<T, F>(&mut self, b: Breaks, elts: &[T], mut op: F) -> io::Result<()> |
| where F: FnMut(&mut Self, &T) -> io::Result<()>, |
| { |
| self.rbox(0, b)?; |
| let mut first = true; |
| for elt in elts { |
| if first { first = false; } else { self.word_space(",")?; } |
| op(self, elt)?; |
| } |
| self.end() |
| } |
| |
| fn next_lit(&mut self, pos: BytePos) -> Option<comments::Literal> { |
| while let Some(ltrl) = self.cur_lit().cloned() { |
| if ltrl.pos > pos { break; } |
| |
| // we don't need the value here since we're forced to clone cur_lit |
| // due to lack of NLL. |
| self.bump_lit(); |
| if ltrl.pos == pos { |
| return Some(ltrl); |
| } |
| } |
| |
| None |
| } |
| |
| fn maybe_print_comment(&mut self, pos: BytePos) -> io::Result<()> { |
| while let Some(ref cmnt) = self.next_comment() { |
| if cmnt.pos < pos { |
| self.print_comment(cmnt)?; |
| } else { |
| break |
| } |
| } |
| Ok(()) |
| } |
| |
| fn print_comment(&mut self, |
| cmnt: &comments::Comment) -> io::Result<()> { |
| let r = match cmnt.style { |
| comments::Mixed => { |
| assert_eq!(cmnt.lines.len(), 1); |
| self.writer().zerobreak()?; |
| self.writer().word(&cmnt.lines[0])?; |
| self.writer().zerobreak() |
| } |
| comments::Isolated => { |
| self.hardbreak_if_not_bol()?; |
| for line in &cmnt.lines { |
| // Don't print empty lines because they will end up as trailing |
| // whitespace |
| if !line.is_empty() { |
| self.writer().word(&line[..])?; |
| } |
| self.writer().hardbreak()?; |
| } |
| Ok(()) |
| } |
| comments::Trailing => { |
| if !self.is_bol() { |
| self.writer().word(" ")?; |
| } |
| if cmnt.lines.len() == 1 { |
| self.writer().word(&cmnt.lines[0])?; |
| self.writer().hardbreak() |
| } else { |
| self.ibox(0)?; |
| for line in &cmnt.lines { |
| if !line.is_empty() { |
| self.writer().word(&line[..])?; |
| } |
| self.writer().hardbreak()?; |
| } |
| self.end() |
| } |
| } |
| comments::BlankLine => { |
| // We need to do at least one, possibly two hardbreaks. |
| let is_semi = match self.writer().last_token() { |
| pp::Token::String(s, _) => ";" == s, |
| _ => false |
| }; |
| if is_semi || self.is_begin() || self.is_end() { |
| self.writer().hardbreak()?; |
| } |
| self.writer().hardbreak() |
| } |
| }; |
| match r { |
| Ok(()) => { |
| *self.cur_cmnt() = *self.cur_cmnt() + 1; |
| Ok(()) |
| } |
| Err(e) => Err(e), |
| } |
| } |
| |
| fn next_comment(&mut self) -> Option<comments::Comment> { |
| let cur_cmnt = *self.cur_cmnt(); |
| match *self.comments() { |
| Some(ref cmnts) => { |
| if cur_cmnt < cmnts.len() { |
| Some(cmnts[cur_cmnt].clone()) |
| } else { |
| None |
| } |
| } |
| _ => None |
| } |
| } |
| |
| fn print_literal(&mut self, lit: &ast::Lit) -> io::Result<()> { |
| self.maybe_print_comment(lit.span.lo())?; |
| if let Some(ltrl) = self.next_lit(lit.span.lo()) { |
| return self.writer().word(<rl.lit); |
| } |
| match lit.node { |
| ast::LitKind::Str(st, style) => self.print_string(&st.as_str(), style), |
| ast::LitKind::Byte(byte) => { |
| let mut res = String::from("b'"); |
| res.extend(ascii::escape_default(byte).map(|c| c as char)); |
| res.push('\''); |
| self.writer().word(&res[..]) |
| } |
| ast::LitKind::Char(ch) => { |
| let mut res = String::from("'"); |
| res.extend(ch.escape_default()); |
| res.push('\''); |
| self.writer().word(&res[..]) |
| } |
| ast::LitKind::Int(i, t) => { |
| match t { |
| ast::LitIntType::Signed(st) => { |
| self.writer().word(&st.val_to_string(i as i128)) |
| } |
| ast::LitIntType::Unsigned(ut) => { |
| self.writer().word(&ut.val_to_string(i)) |
| } |
| ast::LitIntType::Unsuffixed => { |
| self.writer().word(&i.to_string()) |
| } |
| } |
| } |
| ast::LitKind::Float(ref f, t) => { |
| self.writer().word(&format!("{}{}", &f, t.ty_to_string())) |
| } |
| ast::LitKind::FloatUnsuffixed(ref f) => self.writer().word(&f.as_str()), |
| ast::LitKind::Bool(val) => { |
| if val { self.writer().word("true") } else { self.writer().word("false") } |
| } |
| ast::LitKind::ByteStr(ref v) => { |
| let mut escaped: String = String::new(); |
| for &ch in v.iter() { |
| escaped.extend(ascii::escape_default(ch) |
| .map(|c| c as char)); |
| } |
| self.writer().word(&format!("b\"{}\"", escaped)) |
| } |
| } |
| } |
| |
| fn print_string(&mut self, st: &str, |
| style: ast::StrStyle) -> io::Result<()> { |
| let st = match style { |
| ast::StrStyle::Cooked => { |
| (format!("\"{}\"", st.escape_debug())) |
| } |
| ast::StrStyle::Raw(n) => { |
| (format!("r{delim}\"{string}\"{delim}", |
| delim="#".repeat(n as usize), |
| string=st)) |
| } |
| }; |
| self.writer().word(&st[..]) |
| } |
| |
| fn print_inner_attributes(&mut self, |
| attrs: &[ast::Attribute]) -> io::Result<()> { |
| self.print_either_attributes(attrs, ast::AttrStyle::Inner, false, true) |
| } |
| |
| fn print_inner_attributes_no_trailing_hardbreak(&mut self, |
| attrs: &[ast::Attribute]) |
| -> io::Result<()> { |
| self.print_either_attributes(attrs, ast::AttrStyle::Inner, false, false) |
| } |
| |
| fn print_outer_attributes(&mut self, |
| attrs: &[ast::Attribute]) -> io::Result<()> { |
| self.print_either_attributes(attrs, ast::AttrStyle::Outer, false, true) |
| } |
| |
| fn print_inner_attributes_inline(&mut self, |
| attrs: &[ast::Attribute]) -> io::Result<()> { |
| self.print_either_attributes(attrs, ast::AttrStyle::Inner, true, true) |
| } |
| |
| fn print_outer_attributes_inline(&mut self, |
| attrs: &[ast::Attribute]) -> io::Result<()> { |
| self.print_either_attributes(attrs, ast::AttrStyle::Outer, true, true) |
| } |
| |
| fn print_either_attributes(&mut self, |
| attrs: &[ast::Attribute], |
| kind: ast::AttrStyle, |
| is_inline: bool, |
| trailing_hardbreak: bool) -> io::Result<()> { |
| let mut count = 0; |
| for attr in attrs { |
| if attr.style == kind { |
| self.print_attribute_inline(attr, is_inline)?; |
| if is_inline { |
| self.nbsp()?; |
| } |
| count += 1; |
| } |
| } |
| if count > 0 && trailing_hardbreak && !is_inline { |
| self.hardbreak_if_not_bol()?; |
| } |
| Ok(()) |
| } |
| |
| fn print_attribute_path(&mut self, path: &ast::Path) -> io::Result<()> { |
| for (i, segment) in path.segments.iter().enumerate() { |
| if i > 0 { |
| self.writer().word("::")? |
| } |
| if segment.ident.name != keywords::CrateRoot.name() && |
| segment.ident.name != keywords::DollarCrate.name() |
| { |
| self.writer().word(&segment.ident.as_str())?; |
| } else if segment.ident.name == keywords::DollarCrate.name() { |
| self.print_dollar_crate(segment.ident.span.ctxt())?; |
| } |
| } |
| Ok(()) |
| } |
| |
| fn print_attribute(&mut self, attr: &ast::Attribute) -> io::Result<()> { |
| self.print_attribute_inline(attr, false) |
| } |
| |
| fn print_attribute_inline(&mut self, attr: &ast::Attribute, |
| is_inline: bool) -> io::Result<()> { |
| if !is_inline { |
| self.hardbreak_if_not_bol()?; |
| } |
| self.maybe_print_comment(attr.span.lo())?; |
| if attr.is_sugared_doc { |
| self.writer().word(&attr.value_str().unwrap().as_str())?; |
| self.writer().hardbreak() |
| } else { |
| match attr.style { |
| ast::AttrStyle::Inner => self.writer().word("#![")?, |
| ast::AttrStyle::Outer => self.writer().word("#[")?, |
| } |
| if let Some(mi) = attr.meta() { |
| self.print_meta_item(&mi)? |
| } else { |
| self.print_attribute_path(&attr.path)?; |
| self.writer().space()?; |
| self.print_tts(attr.tokens.clone())?; |
| } |
| self.writer().word("]") |
| } |
| } |
| |
| fn print_meta_list_item(&mut self, item: &ast::NestedMetaItem) -> io::Result<()> { |
| match item.node { |
| ast::NestedMetaItemKind::MetaItem(ref mi) => { |
| self.print_meta_item(mi) |
| }, |
| ast::NestedMetaItemKind::Literal(ref lit) => { |
| self.print_literal(lit) |
| } |
| } |
| } |
| |
| fn print_meta_item(&mut self, item: &ast::MetaItem) -> io::Result<()> { |
| self.ibox(INDENT_UNIT)?; |
| match item.node { |
| ast::MetaItemKind::Word => self.print_attribute_path(&item.ident)?, |
| ast::MetaItemKind::NameValue(ref value) => { |
| self.print_attribute_path(&item.ident)?; |
| self.writer().space()?; |
| self.word_space("=")?; |
| self.print_literal(value)?; |
| } |
| ast::MetaItemKind::List(ref items) => { |
| self.print_attribute_path(&item.ident)?; |
| self.popen()?; |
| self.commasep(Consistent, |
| &items[..], |
| |s, i| s.print_meta_list_item(i))?; |
| self.pclose()?; |
| } |
| } |
| self.end() |
| } |
| |
| /// 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. |
| fn print_tt(&mut self, tt: tokenstream::TokenTree) -> io::Result<()> { |
| match tt { |
| TokenTree::Token(_, ref tk) => { |
| self.writer().word(&token_to_string(tk))?; |
| match *tk { |
| parse::token::DocComment(..) => { |
| self.writer().hardbreak() |
| } |
| _ => Ok(()) |
| } |
| } |
| TokenTree::Delimited(_, ref delimed) => { |
| self.writer().word(&token_to_string(&delimed.open_token()))?; |
| self.writer().space()?; |
| self.print_tts(delimed.stream())?; |
| self.writer().space()?; |
| self.writer().word(&token_to_string(&delimed.close_token())) |
| }, |
| } |
| } |
| |
| fn print_tts(&mut self, tts: tokenstream::TokenStream) -> io::Result<()> { |
| self.ibox(0)?; |
| for (i, tt) in tts.into_trees().enumerate() { |
| if i != 0 { |
| self.writer().space()?; |
| } |
| self.print_tt(tt)?; |
| } |
| self.end() |
| } |
| |
| fn space_if_not_bol(&mut self) -> io::Result<()> { |
| if !self.is_bol() { self.writer().space()?; } |
| Ok(()) |
| } |
| |
| fn nbsp(&mut self) -> io::Result<()> { self.writer().word(" ") } |
| |
| fn print_dollar_crate(&mut self, mut ctxt: SyntaxContext) -> io::Result<()> { |
| if let Some(mark) = ctxt.adjust(Mark::root()) { |
| // Make a best effort to print something that complies |
| if mark.is_builtin() { |
| if let Some(name) = std_inject::injected_crate_name() { |
| self.writer().word("::")?; |
| self.writer().word(name)?; |
| } |
| } |
| } |
| Ok(()) |
| } |
| } |
| |
| 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(&mut self) -> &mut usize { |
| &mut self.cur_cmnt |
| } |
| |
| fn cur_lit(&mut self) -> Option<&comments::Literal> { |
| self.literals.peek() |
| } |
| |
| fn bump_lit(&mut self) -> Option<comments::Literal> { |
| self.literals.next() |
| } |
| } |
| |
| impl<'a> State<'a> { |
| pub fn cbox(&mut self, u: usize) -> io::Result<()> { |
| self.boxes.push(pp::Breaks::Consistent); |
| self.s.cbox(u) |
| } |
| |
| pub fn word_nbsp(&mut self, w: &str) -> io::Result<()> { |
| self.s.word(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<()> { |
| self.s.word("{")?; |
| 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))?; |
| self.s.word("}")?; |
| 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 break_offset_if_not_bol(&mut self, n: usize, |
| off: isize) -> io::Result<()> { |
| if !self.is_bol() { |
| self.s.break_offset(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::Printer::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<()> { |
| self.s.word("/*")?; |
| self.s.space()?; |
| self.s.word(&text[..])?; |
| self.s.space()?; |
| self.s.word("*/") |
| } |
| |
| |
| |
| 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 { |
| self.s.word(",")?; |
| 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<ast::Expr>]) -> io::Result<()> { |
| 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]) -> io::Result<()> { |
| self.print_inner_attributes(attrs)?; |
| for item in &_mod.items { |
| self.print_item(item)?; |
| } |
| Ok(()) |
| } |
| |
| pub fn print_foreign_mod(&mut self, nmod: &ast::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<ast::Lifetime>) -> io::Result<()> { |
| if let Some(lt) = *lifetime { |
| self.print_lifetime(lt)?; |
| self.nbsp()?; |
| } |
| Ok(()) |
| } |
| |
| pub fn print_generic_arg(&mut self, generic_arg: &GenericArg) -> io::Result<()> { |
| match generic_arg { |
| GenericArg::Lifetime(lt) => self.print_lifetime(*lt), |
| GenericArg::Type(ty) => self.print_type(ty), |
| } |
| } |
| |
| pub fn print_type(&mut self, ty: &ast::Ty) -> io::Result<()> { |
| self.maybe_print_comment(ty.span.lo())?; |
| self.ibox(0)?; |
| match ty.node { |
| ast::TyKind::Slice(ref ty) => { |
| self.s.word("[")?; |
| self.print_type(ty)?; |
| self.s.word("]")?; |
| } |
| ast::TyKind::Ptr(ref mt) => { |
| self.s.word("*")?; |
| match mt.mutbl { |
| ast::Mutability::Mutable => self.word_nbsp("mut")?, |
| ast::Mutability::Immutable => self.word_nbsp("const")?, |
| } |
| self.print_type(&mt.ty)?; |
| } |
| ast::TyKind::Rptr(ref lifetime, ref mt) => { |
| self.s.word("&")?; |
| self.print_opt_lifetime(lifetime)?; |
| self.print_mt(mt)?; |
| } |
| ast::TyKind::Never => { |
| self.s.word("!")?; |
| }, |
| ast::TyKind::Tup(ref elts) => { |
| self.popen()?; |
| self.commasep(Inconsistent, &elts[..], |
| |s, ty| s.print_type(ty))?; |
| if elts.len() == 1 { |
| self.s.word(",")?; |
| } |
| self.pclose()?; |
| } |
| ast::TyKind::Paren(ref typ) => { |
| self.popen()?; |
| self.print_type(typ)?; |
| self.pclose()?; |
| } |
| ast::TyKind::BareFn(ref f) => { |
| self.print_ty_fn(f.abi, |
| f.unsafety, |
| &f.decl, |
| None, |
| &f.generic_params)?; |
| } |
| ast::TyKind::Path(None, ref path) => { |
| self.print_path(path, false, 0)?; |
| } |
| ast::TyKind::Path(Some(ref qself), ref path) => { |
| self.print_qpath(path, qself, false)? |
| } |
| ast::TyKind::TraitObject(ref bounds, syntax) => { |
| let prefix = if syntax == ast::TraitObjectSyntax::Dyn { "dyn" } else { "" }; |
| self.print_type_bounds(prefix, &bounds[..])?; |
| } |
| ast::TyKind::ImplTrait(_, ref bounds) => { |
| self.print_type_bounds("impl", &bounds[..])?; |
| } |
| ast::TyKind::Array(ref ty, ref length) => { |
| self.s.word("[")?; |
| self.print_type(ty)?; |
| self.s.word("; ")?; |
| self.print_expr(&length.value)?; |
| self.s.word("]")?; |
| } |
| ast::TyKind::Typeof(ref e) => { |
| self.s.word("typeof(")?; |
| self.print_expr(&e.value)?; |
| self.s.word(")")?; |
| } |
| ast::TyKind::Infer => { |
| self.s.word("_")?; |
| } |
| ast::TyKind::Err => { |
| self.s.word("?")?; |
| } |
| ast::TyKind::ImplicitSelf => { |
| self.s.word("Self")?; |
| } |
| ast::TyKind::Mac(ref m) => { |
| self.print_mac(m)?; |
| } |
| } |
| self.end() |
| } |
| |
| pub fn print_foreign_item(&mut self, |
| item: &ast::ForeignItem) -> io::Result<()> { |
| self.hardbreak_if_not_bol()?; |
| self.maybe_print_comment(item.span.lo())?; |
| self.print_outer_attributes(&item.attrs)?; |
| match item.node { |
| ast::ForeignItemKind::Fn(ref decl, ref generics) => { |
| self.head("")?; |
| self.print_fn(decl, ast::FnHeader::default(), |
| Some(item.ident), |
| generics, &item.vis)?; |
| self.end()?; // end head-ibox |
| self.s.word(";")?; |
| self.end() // end the outer fn box |
| } |
| ast::ForeignItemKind::Static(ref t, m) => { |
| self.head(&visibility_qualified(&item.vis, "static"))?; |
| if m { |
| self.word_space("mut")?; |
| } |
| self.print_ident(item.ident)?; |
| self.word_space(":")?; |
| self.print_type(t)?; |
| self.s.word(";")?; |
| self.end()?; // end the head-ibox |
| self.end() // end the outer cbox |
| } |
| ast::ForeignItemKind::Ty => { |
| self.head(&visibility_qualified(&item.vis, "type"))?; |
| self.print_ident(item.ident)?; |
| self.s.word(";")?; |
| self.end()?; // end the head-ibox |
| self.end() // end the outer cbox |
| } |
| ast::ForeignItemKind::Macro(ref m) => { |
| self.print_mac(m)?; |
| match m.node.delim { |
| MacDelimiter::Brace => Ok(()), |
| _ => self.s.word(";") |
| } |
| } |
| } |
| } |
| |
| fn print_associated_const(&mut self, |
| ident: ast::Ident, |
| ty: &ast::Ty, |
| default: Option<&ast::Expr>, |
| vis: &ast::Visibility) |
| -> io::Result<()> |
| { |
| self.s.word(&visibility_qualified(vis, ""))?; |
| self.word_space("const")?; |
| self.print_ident(ident)?; |
| self.word_space(":")?; |
| self.print_type(ty)?; |
| if let Some(expr) = default { |
| self.s.space()?; |
| self.word_space("=")?; |
| self.print_expr(expr)?; |
| } |
| self.s.word(";") |
| } |
| |
| fn print_associated_type(&mut self, |
| ident: ast::Ident, |
| bounds: Option<&ast::GenericBounds>, |
| ty: Option<&ast::Ty>) |
| -> io::Result<()> { |
| self.word_space("type")?; |
| self.print_ident(ident)?; |
| if let Some(bounds) = bounds { |
| self.print_type_bounds(":", bounds)?; |
| } |
| if let Some(ty) = ty { |
| self.s.space()?; |
| self.word_space("=")?; |
| self.print_type(ty)?; |
| } |
| self.s.word(";") |
| } |
| |
| /// Pretty-print an item |
| pub fn print_item(&mut self, item: &ast::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 { |
| ast::ItemKind::ExternCrate(orig_name) => { |
| self.head(&visibility_qualified(&item.vis, "extern crate"))?; |
| if let Some(orig_name) = orig_name { |
| self.print_name(orig_name)?; |
| self.s.space()?; |
| self.s.word("as")?; |
| self.s.space()?; |
| } |
| self.print_ident(item.ident)?; |
| self.s.word(";")?; |
| self.end()?; // end inner head-block |
| self.end()?; // end outer head-block |
| } |
| ast::ItemKind::Use(ref tree) => { |
| self.head(&visibility_qualified(&item.vis, "use"))?; |
| self.print_use_tree(tree)?; |
| self.s.word(";")?; |
| self.end()?; // end inner head-block |
| self.end()?; // end outer head-block |
| } |
| ast::ItemKind::Static(ref ty, m, ref expr) => { |
| self.head(&visibility_qualified(&item.vis, "static"))?; |
| if m == ast::Mutability::Mutable { |
| self.word_space("mut")?; |
| } |
| self.print_ident(item.ident)?; |
| self.word_space(":")?; |
| self.print_type(ty)?; |
| self.s.space()?; |
| self.end()?; // end the head-ibox |
| |
| self.word_space("=")?; |
| self.print_expr(expr)?; |
| self.s.word(";")?; |
| self.end()?; // end the outer cbox |
| } |
| ast::ItemKind::Const(ref ty, ref expr) => { |
| self.head(&visibility_qualified(&item.vis, "const"))?; |
| self.print_ident(item.ident)?; |
| self.word_space(":")?; |
| self.print_type(ty)?; |
| self.s.space()?; |
| self.end()?; // end the head-ibox |
| |
| self.word_space("=")?; |
| self.print_expr(expr)?; |
| self.s.word(";")?; |
| self.end()?; // end the outer cbox |
| } |
| ast::ItemKind::Fn(ref decl, header, ref typarams, ref body) => { |
| self.head("")?; |
| self.print_fn( |
| decl, |
| header, |
| Some(item.ident), |
| typarams, |
| &item.vis |
| )?; |
| self.s.word(" ")?; |
| self.print_block_with_attrs(body, &item.attrs)?; |
| } |
| ast::ItemKind::Mod(ref _mod) => { |
| self.head(&visibility_qualified(&item.vis, "mod"))?; |
| self.print_ident(item.ident)?; |
| self.nbsp()?; |
| self.bopen()?; |
| self.print_mod(_mod, &item.attrs)?; |
| self.bclose(item.span)?; |
| } |
| ast::ItemKind::ForeignMod(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)?; |
| } |
| ast::ItemKind::GlobalAsm(ref ga) => { |
| self.head(&visibility_qualified(&item.vis, "global_asm!"))?; |
| self.s.word(&ga.asm.as_str())?; |
| self.end()?; |
| } |
| ast::ItemKind::Ty(ref ty, ref generics) => { |
| self.head(&visibility_qualified(&item.vis, "type"))?; |
| self.print_ident(item.ident)?; |
| self.print_generic_params(&generics.params)?; |
| self.end()?; // end the inner ibox |
| |
| self.print_where_clause(&generics.where_clause)?; |
| self.s.space()?; |
| self.word_space("=")?; |
| self.print_type(ty)?; |
| self.s.word(";")?; |
| self.end()?; // end the outer ibox |
| } |
| ast::ItemKind::Existential(ref bounds, ref generics) => { |
| self.head(&visibility_qualified(&item.vis, "existential type"))?; |
| self.print_ident(item.ident)?; |
| self.print_generic_params(&generics.params)?; |
| self.end()?; // end the inner ibox |
| |
| self.print_where_clause(&generics.where_clause)?; |
| self.s.space()?; |
| self.print_type_bounds(":", bounds)?; |
| self.s.word(";")?; |
| self.end()?; // end the outer ibox |
| } |
| ast::ItemKind::Enum(ref enum_definition, ref params) => { |
| self.print_enum_def( |
| enum_definition, |
| params, |
| item.ident, |
| item.span, |
| &item.vis |
| )?; |
| } |
| ast::ItemKind::Struct(ref struct_def, ref generics) => { |
| self.head(&visibility_qualified(&item.vis, "struct"))?; |
| self.print_struct(struct_def, generics, item.ident, item.span, true)?; |
| } |
| ast::ItemKind::Union(ref struct_def, ref generics) => { |
| self.head(&visibility_qualified(&item.vis, "union"))?; |
| self.print_struct(struct_def, generics, item.ident, item.span, true)?; |
| } |
| ast::ItemKind::Impl(unsafety, |
| polarity, |
| defaultness, |
| ref generics, |
| ref opt_trait, |
| ref ty, |
| ref impl_items) => { |
| self.head("")?; |
| self.print_visibility(&item.vis)?; |
| self.print_defaultness(defaultness)?; |
| self.print_unsafety(unsafety)?; |
| self.word_nbsp("impl")?; |
| |
| if !generics.params.is_empty() { |
| self.print_generic_params(&generics.params)?; |
| self.s.space()?; |
| } |
| |
| if polarity == ast::ImplPolarity::Negative { |
| self.s.word("!")?; |
| } |
| |
| if let Some(ref t) = *opt_trait { |
| self.print_trait_ref(t)?; |
| self.s.space()?; |
| self.word_space("for")?; |
| } |
| |
| self.print_type(ty)?; |
| self.print_where_clause(&generics.where_clause)?; |
| |
| self.s.space()?; |
| self.bopen()?; |
| self.print_inner_attributes(&item.attrs)?; |
| for impl_item in impl_items { |
| self.print_impl_item(impl_item)?; |
| } |
| self.bclose(item.span)?; |
| } |
| ast::ItemKind::Trait(is_auto, unsafety, ref generics, ref bounds, ref trait_items) => { |
| self.head("")?; |
| self.print_visibility(&item.vis)?; |
| self.print_unsafety(unsafety)?; |
| self.print_is_auto(is_auto)?; |
| self.word_nbsp("trait")?; |
| self.print_ident(item.ident)?; |
| self.print_generic_params(&generics.params)?; |
| let mut real_bounds = Vec::with_capacity(bounds.len()); |
| for b in bounds.iter() { |
| if let GenericBound::Trait(ref ptr, ast::TraitBoundModifier::Maybe) = *b { |
| self.s.space()?; |
| self.word_space("for ?")?; |
| self.print_trait_ref(&ptr.trait_ref)?; |
| } else { |
| real_bounds.push(b.clone()); |
| } |
| } |
| self.print_type_bounds(":", &real_bounds[..])?; |
| self.print_where_clause(&generics.where_clause)?; |
| self.s.word(" ")?; |
| self.bopen()?; |
| for trait_item in trait_items { |
| self.print_trait_item(trait_item)?; |
| } |
| self.bclose(item.span)?; |
| } |
| ast::ItemKind::TraitAlias(ref generics, ref bounds) => { |
| self.head("")?; |
| self.print_visibility(&item.vis)?; |
| self.word_nbsp("trait")?; |
| self.print_ident(item.ident)?; |
| self.print_generic_params(&generics.params)?; |
| let mut real_bounds = Vec::with_capacity(bounds.len()); |
| // FIXME(durka) this seems to be some quite outdated syntax |
| for b in bounds.iter() { |
| if let GenericBound::Trait(ref ptr, ast::TraitBoundModifier::Maybe) = *b { |
| self.s.space()?; |
| self.word_space("for ?")?; |
| self.print_trait_ref(&ptr.trait_ref)?; |
| } else { |
| real_bounds.push(b.clone()); |
| } |
| } |
| self.nbsp()?; |
| self.print_type_bounds("=", &real_bounds[..])?; |
| self.print_where_clause(&generics.where_clause)?; |
| self.s.word(";")?; |
| } |
| ast::ItemKind::Mac(ref mac) => { |
| if item.ident.name == keywords::Invalid.name() { |
| self.print_mac(mac)?; |
| match mac.node.delim { |
| MacDelimiter::Brace => {} |
| _ => self.s.word(";")?, |
| } |
| } else { |
| self.print_path(&mac.node.path, false, 0)?; |
| self.s.word("! ")?; |
| self.print_ident(item.ident)?; |
| self.cbox(INDENT_UNIT)?; |
| self.popen()?; |
| self.print_tts(mac.node.stream())?; |
| self.pclose()?; |
| self.s.word(";")?; |
| self.end()?; |
| } |
| } |
| ast::ItemKind::MacroDef(ref tts) => { |
| self.s.word("macro_rules! ")?; |
| self.print_ident(item.ident)?; |
| self.cbox(INDENT_UNIT)?; |
| self.popen()?; |
| self.print_tts(tts.stream())?; |
| self.pclose()?; |
| self.s.word(";")?; |
| self.end()?; |
| } |
| } |
| self.ann.post(self, NodeItem(item)) |
| } |
| |
| fn print_trait_ref(&mut self, t: &ast::TraitRef) -> io::Result<()> { |
| self.print_path(&t.path, false, 0) |
| } |
| |
| fn print_formal_generic_params( |
| &mut self, |
| generic_params: &[ast::GenericParam] |
| ) -> io::Result<()> { |
| if !generic_params.is_empty() { |
| self.s.word("for")?; |
| self.print_generic_params(generic_params)?; |
| self.nbsp()?; |
| } |
| Ok(()) |
| } |
| |
| fn print_poly_trait_ref(&mut self, t: &ast::PolyTraitRef) -> io::Result<()> { |
| self.print_formal_generic_params(&t.bound_generic_params)?; |
| self.print_trait_ref(&t.trait_ref) |
| } |
| |
| pub fn print_enum_def(&mut self, enum_definition: &ast::EnumDef, |
| generics: &ast::Generics, ident: ast::Ident, |
| span: syntax_pos::Span, |
| visibility: &ast::Visibility) -> io::Result<()> { |
| self.head(&visibility_qualified(visibility, "enum"))?; |
| self.print_ident(ident)?; |
| self.print_generic_params(&generics.params)?; |
| self.print_where_clause(&generics.where_clause)?; |
| self.s.space()?; |
| self.print_variants(&enum_definition.variants, span) |
| } |
| |
| pub fn print_variants(&mut self, |
| variants: &[ast::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)?; |
| self.s.word(",")?; |
| self.end()?; |
| self.maybe_print_trailing_comment(v.span, None)?; |
| } |
| self.bclose(span) |
| } |
| |
| pub fn print_visibility(&mut self, vis: &ast::Visibility) -> io::Result<()> { |
| match vis.node { |
| ast::VisibilityKind::Public => self.word_nbsp("pub"), |
| ast::VisibilityKind::Crate(sugar) => match sugar { |
| ast::CrateSugar::PubCrate => self.word_nbsp("pub(crate)"), |
| ast::CrateSugar::JustCrate => self.word_nbsp("crate") |
| } |
| ast::VisibilityKind::Restricted { ref path, .. } => { |
| let path = to_string(|s| s.print_path(path, false, 0)); |
| if path == "self" || path == "super" { |
| self.word_nbsp(&format!("pub({})", path)) |
| } else { |
| self.word_nbsp(&format!("pub(in {})", path)) |
| } |
| } |
| ast::VisibilityKind::Inherited => Ok(()) |
| } |
| } |
| |
| pub fn print_defaultness(&mut self, defaultness: ast::Defaultness) -> io::Result<()> { |
| if let ast::Defaultness::Default = defaultness { |
| try!(self.word_nbsp("default")); |
| } |
| Ok(()) |
| } |
| |
| pub fn print_struct(&mut self, |
| struct_def: &ast::VariantData, |
| generics: &ast::Generics, |
| ident: ast::Ident, |
| span: syntax_pos::Span, |
| print_finalizer: bool) -> io::Result<()> { |
| self.print_ident(ident)?; |
| self.print_generic_params(&generics.params)?; |
| 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 { |
| self.s.word(";")?; |
| } |
| 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_ident(field.ident.unwrap())?; |
| self.word_nbsp(":")?; |
| self.print_type(&field.ty)?; |
| self.s.word(",")?; |
| } |
| |
| self.bclose(span) |
| } |
| } |
| |
| pub fn print_variant(&mut self, v: &ast::Variant) -> io::Result<()> { |
| self.head("")?; |
| let generics = ast::Generics::default(); |
| self.print_struct(&v.node.data, &generics, v.node.ident, v.span, false)?; |
| match v.node.disr_expr { |
| Some(ref d) => { |
| self.s.space()?; |
| self.word_space("=")?; |
| self.print_expr(&d.value) |
| } |
| _ => Ok(()) |
| } |
| } |
| |
| pub fn print_method_sig(&mut self, |
| ident: ast::Ident, |
| generics: &ast::Generics, |
| m: &ast::MethodSig, |
| vis: &ast::Visibility) |
| -> io::Result<()> { |
| self.print_fn(&m.decl, |
| m.header, |
| Some(ident), |
| &generics, |
| vis) |
| } |
| |
| pub fn print_trait_item(&mut self, ti: &ast::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 { |
| ast::TraitItemKind::Const(ref ty, ref default) => { |
| self.print_associated_const( |
| ti.ident, |
| ty, |
| default.as_ref().map(|expr| &**expr), |
| &codemap::respan(ti.span.shrink_to_lo(), ast::VisibilityKind::Inherited), |
| )?; |
| } |
| ast::TraitItemKind::Method(ref sig, ref body) => { |
| if body.is_some() { |
| self.head("")?; |
| } |
| self.print_method_sig( |
| ti.ident, |
| &ti.generics, |
| sig, |
| &codemap::respan(ti.span.shrink_to_lo(), ast::VisibilityKind::Inherited), |
| )?; |
| if let Some(ref body) = *body { |
| self.nbsp()?; |
| self.print_block_with_attrs(body, &ti.attrs)?; |
| } else { |
| self.s.word(";")?; |
| } |
| } |
| ast::TraitItemKind::Type(ref bounds, ref default) => { |
| self.print_associated_type(ti.ident, Some(bounds), |
| default.as_ref().map(|ty| &**ty))?; |
| } |
| ast::TraitItemKind::Macro(ref mac) => { |
| self.print_mac(mac)?; |
| match mac.node.delim { |
| MacDelimiter::Brace => {} |
| _ => self.s.word(";")?, |
| } |
| } |
| } |
| self.ann.post(self, NodeSubItem(ti.id)) |
| } |
| |
| pub fn print_impl_item(&mut self, ii: &ast::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)?; |
| self.print_defaultness(ii.defaultness)?; |
| match ii.node { |
| ast::ImplItemKind::Const(ref ty, ref expr) => { |
| self.print_associated_const(ii.ident, ty, Some(expr), &ii.vis)?; |
| } |
| ast::ImplItemKind::Method(ref sig, ref body) => { |
| self.head("")?; |
| self.print_method_sig(ii.ident, &ii.generics, sig, &ii.vis)?; |
| self.nbsp()?; |
| self.print_block_with_attrs(body, &ii.attrs)?; |
| } |
| ast::ImplItemKind::Type(ref ty) => { |
| self.print_associated_type(ii.ident, None, Some(ty))?; |
| } |
| ast::ImplItemKind::Existential(ref bounds) => { |
| self.word_space("existential")?; |
| self.print_associated_type(ii.ident, Some(bounds), None)?; |
| } |
| ast::ImplItemKind::Macro(ref mac) => { |
| self.print_mac(mac)?; |
| match mac.node.delim { |
| MacDelimiter::Brace => {} |
| _ => self.s.word(";")?, |
| } |
| } |
| } |
| self.ann.post(self, NodeSubItem(ii.id)) |
| } |
| |
| pub fn print_stmt(&mut self, st: &ast::Stmt) -> io::Result<()> { |
| self.maybe_print_comment(st.span.lo())?; |
| match st.node { |
| ast::StmtKind::Local(ref loc) => { |
| self.print_outer_attributes(&loc.attrs)?; |
| 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.s.word(";")?; |
| self.end()?; |
| } |
| ast::StmtKind::Item(ref item) => self.print_item(item)?, |
| ast::StmtKind::Expr(ref expr) => { |
| self.space_if_not_bol()?; |
| self.print_expr_outer_attr_style(expr, false)?; |
| if parse::classify::expr_requires_semi_to_be_stmt(expr) { |
| self.s.word(";")?; |
| } |
| } |
| ast::StmtKind::Semi(ref expr) => { |
| self.space_if_not_bol()?; |
| self.print_expr_outer_attr_style(expr, false)?; |
| self.s.word(";")?; |
| } |
| ast::StmtKind::Mac(ref mac) => { |
| let (ref mac, style, ref attrs) = **mac; |
| self.space_if_not_bol()?; |
| self.print_outer_attributes(attrs)?; |
| self.print_mac(mac)?; |
| if style == ast::MacStmtStyle::Semicolon { |
| self.s.word(";")?; |
| } |
| } |
| } |
| self.maybe_print_trailing_comment(st.span, None) |
| } |
| |
| pub fn print_block(&mut self, blk: &ast::Block) -> io::Result<()> { |
| self.print_block_with_attrs(blk, &[]) |
| } |
| |
| pub fn print_block_unclosed(&mut self, blk: &ast::Block) -> io::Result<()> { |
| self.print_block_unclosed_indent(blk, INDENT_UNIT) |
| } |
| |
| pub fn print_block_unclosed_with_attrs(&mut self, blk: &ast::Block, |
| attrs: &[ast::Attribute]) |
| -> io::Result<()> { |
| self.print_block_maybe_unclosed(blk, INDENT_UNIT, attrs, false) |
| } |
| |
| pub fn print_block_unclosed_indent(&mut self, blk: &ast::Block, |
| indented: usize) -> io::Result<()> { |
| self.print_block_maybe_unclosed(blk, indented, &[], false) |
| } |
| |
| pub fn print_block_with_attrs(&mut self, |
| blk: &ast::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: &ast::Block, |
| indented: usize, |
| attrs: &[ast::Attribute], |
| close_box: bool) -> io::Result<()> { |
| match blk.rules { |
| BlockCheckMode::Unsafe(..) => self.word_space("unsafe")?, |
| BlockCheckMode::Default => () |
| } |
| self.maybe_print_comment(blk.span.lo())?; |
| self.ann.pre(self, NodeBlock(blk))?; |
| self.bopen()?; |
| |
| self.print_inner_attributes(attrs)?; |
| |
| for (i, st) in blk.stmts.iter().enumerate() { |
| match st.node { |
| ast::StmtKind::Expr(ref expr) if i == blk.stmts.len() - 1 => { |
| self.maybe_print_comment(st.span.lo())?; |
| self.space_if_not_bol()?; |
| self.print_expr_outer_attr_style(expr, false)?; |
| self.maybe_print_trailing_comment(expr.span, Some(blk.span.hi()))?; |
| } |
| _ => self.print_stmt(st)?, |
| } |
| } |
| |
| self.bclose_maybe_open(blk.span, indented, close_box)?; |
| self.ann.post(self, NodeBlock(blk)) |
| } |
| |
| fn print_else(&mut self, els: Option<&ast::Expr>) -> io::Result<()> { |
| match els { |
| Some(_else) => { |
| match _else.node { |
| // "another else-if" |
| ast::ExprKind::If(ref i, ref then, ref e) => { |
| self.cbox(INDENT_UNIT - 1)?; |
| self.ibox(0)?; |
| self.s.word(" else if ")?; |
| self.print_expr_as_cond(i)?; |
| self.s.space()?; |
| self.print_block(then)?; |
| self.print_else(e.as_ref().map(|e| &**e)) |
| } |
| // "another else-if-let" |
| ast::ExprKind::IfLet(ref pats, ref expr, ref then, ref e) => { |
| self.cbox(INDENT_UNIT - 1)?; |
| self.ibox(0)?; |
| self.s.word(" else if let ")?; |
| self.print_pats(pats)?; |
| self.s.space()?; |
| self.word_space("=")?; |
| self.print_expr_as_cond(expr)?; |
| self.s.space()?; |
| self.print_block(then)?; |
| self.print_else(e.as_ref().map(|e| &**e)) |
| } |
| // "final else" |
| ast::ExprKind::Block(ref b, _) => { |
| self.cbox(INDENT_UNIT - 1)?; |
| self.ibox(0)?; |
| self.s.word(" 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: &ast::Expr, blk: &ast::Block, |
| elseopt: Option<&ast::Expr>) -> io::Result<()> { |
| self.head("if")?; |
| self.print_expr_as_cond(test)?; |
| self.s.space()?; |
| self.print_block(blk)?; |
| self.print_else(elseopt) |
| } |
| |
| pub fn print_if_let(&mut self, pats: &[P<ast::Pat>], expr: &ast::Expr, blk: &ast::Block, |
| elseopt: Option<&ast::Expr>) -> io::Result<()> { |
| self.head("if let")?; |
| self.print_pats(pats)?; |
| self.s.space()?; |
| self.word_space("=")?; |
| self.print_expr_as_cond(expr)?; |
| self.s.space()?; |
| self.print_block(blk)?; |
| self.print_else(elseopt) |
| } |
| |
| pub fn print_mac(&mut self, m: &ast::Mac) -> io::Result<()> { |
| self.print_path(&m.node.path, false, 0)?; |
| self.s.word("!")?; |
| match m.node.delim { |
| MacDelimiter::Parenthesis => self.popen()?, |
| MacDelimiter::Bracket => self.s.word("[")?, |
| MacDelimiter::Brace => { |
| self.head("")?; |
| self.bopen()?; |
| } |
| } |
| self.print_tts(m.node.stream())?; |
| match m.node.delim { |
| MacDelimiter::Parenthesis => self.pclose(), |
| MacDelimiter::Bracket => self.s.word("]"), |
| MacDelimiter::Brace => self.bclose(m.span), |
| } |
| } |
| |
| |
| fn print_call_post(&mut self, args: &[P<ast::Expr>]) -> io::Result<()> { |
| self.popen()?; |
| self.commasep_exprs(Inconsistent, args)?; |
| self.pclose() |
| } |
| |
| pub fn print_expr_maybe_paren(&mut self, expr: &ast::Expr, prec: i8) -> io::Result<()> { |
| let needs_par = expr.precedence().order() < prec; |
| if needs_par { |
| self.popen()?; |
| } |
| self.print_expr(expr)?; |
| if needs_par { |
| self.pclose()?; |
| } |
| Ok(()) |
| } |
| |
| /// Print an expr using syntax that's acceptable in a condition position, such as the `cond` in |
| /// `if cond { ... }`. |
| pub fn print_expr_as_cond(&mut self, expr: &ast::Expr) -> io::Result<()> { |
| let needs_par = match expr.node { |
| // These cases need parens due to the parse error observed in #26461: `if return {}` |
| // parses as the erroneous construct `if (return {})`, not `if (return) {}`. |
| ast::ExprKind::Closure(..) | |
| ast::ExprKind::Ret(..) | |
| ast::ExprKind::Break(..) => true, |
| |
| _ => parser::contains_exterior_struct_lit(expr), |
| }; |
| |
| if needs_par { |
| self.popen()?; |
| } |
| self.print_expr(expr)?; |
| if needs_par { |
| self.pclose()?; |
| } |
| Ok(()) |
| } |
| |
| fn print_expr_vec(&mut self, exprs: &[P<ast::Expr>], |
| attrs: &[Attribute]) -> io::Result<()> { |
| self.ibox(INDENT_UNIT)?; |
| self.s.word("[")?; |
| self.print_inner_attributes_inline(attrs)?; |
| self.commasep_exprs(Inconsistent, &exprs[..])?; |
| self.s.word("]")?; |
| self.end() |
| } |
| |
| fn print_expr_repeat(&mut self, |
| element: &ast::Expr, |
| count: &ast::AnonConst, |
| attrs: &[Attribute]) -> io::Result<()> { |
| self.ibox(INDENT_UNIT)?; |
| self.s.word("[")?; |
| self.print_inner_attributes_inline(attrs)?; |
| self.print_expr(element)?; |
| self.word_space(";")?; |
| self.print_expr(&count.value)?; |
| self.s.word("]")?; |
| self.end() |
| } |
| |
| fn print_expr_struct(&mut self, |
| path: &ast::Path, |
| fields: &[ast::Field], |
| wth: &Option<P<ast::Expr>>, |
| attrs: &[Attribute]) -> io::Result<()> { |
| self.print_path(path, true, 0)?; |
| self.s.word("{")?; |
| self.print_inner_attributes_inline(attrs)?; |
| self.commasep_cmnt( |
| Consistent, |
| &fields[..], |
| |s, field| { |
| s.ibox(INDENT_UNIT)?; |
| if !field.is_shorthand { |
| s.print_ident(field.ident)?; |
| 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() { |
| self.s.word(",")?; |
| self.s.space()?; |
| } |
| self.s.word("..")?; |
| self.print_expr(expr)?; |
| self.end()?; |
| } |
| _ => if !fields.is_empty() { |
| self.s.word(",")? |
| } |
| } |
| self.s.word("}")?; |
| Ok(()) |
| } |
| |
| fn print_expr_tup(&mut self, exprs: &[P<ast::Expr>], |
| attrs: &[Attribute]) -> io::Result<()> { |
| self.popen()?; |
| self.print_inner_attributes_inline(attrs)?; |
| self.commasep_exprs(Inconsistent, &exprs[..])?; |
| if exprs.len() == 1 { |
| self.s.word(",")?; |
| } |
| self.pclose() |
| } |
| |
| fn print_expr_call(&mut self, |
| func: &ast::Expr, |
| args: &[P<ast::Expr>]) -> io::Result<()> { |
| let prec = |
| match func.node { |
| ast::ExprKind::Field(..) => parser::PREC_FORCE_PAREN, |
| _ => parser::PREC_POSTFIX, |
| }; |
| |
| self.print_expr_maybe_paren(func, prec)?; |
| self.print_call_post(args) |
| } |
| |
| fn print_expr_method_call(&mut self, |
| segment: &ast::PathSegment, |
| args: &[P<ast::Expr>]) -> io::Result<()> { |
| let base_args = &args[1..]; |
| self.print_expr_maybe_paren(&args[0], parser::PREC_POSTFIX)?; |
| self.s.word(".")?; |
| self.print_ident(segment.ident)?; |
| if let Some(ref args) = segment.args { |
| self.print_generic_args(args, true)?; |
| } |
| self.print_call_post(base_args) |
| } |
| |
| fn print_expr_binary(&mut self, |
| op: ast::BinOp, |
| lhs: &ast::Expr, |
| rhs: &ast::Expr) -> io::Result<()> { |
| let assoc_op = AssocOp::from_ast_binop(op.node); |
| let prec = assoc_op.precedence() as i8; |
| let fixity = assoc_op.fixity(); |
| |
| let (left_prec, right_prec) = match fixity { |
| Fixity::Left => (prec, prec + 1), |
| Fixity::Right => (prec + 1, prec), |
| Fixity::None => (prec + 1, prec + 1), |
| }; |
| |
| let left_prec = match (&lhs.node, op.node) { |
| // These cases need parens: `x as i32 < y` has the parser thinking that `i32 < y` is |
| // the beginning of a path type. It starts trying to parse `x as (i32 < y ...` instead |
| // of `(x as i32) < ...`. We need to convince it _not_ to do that. |
| (&ast::ExprKind::Cast { .. }, ast::BinOpKind::Lt) | |
| (&ast::ExprKind::Cast { .. }, ast::BinOpKind::Shl) => parser::PREC_FORCE_PAREN, |
| _ => left_prec, |
| }; |
| |
| self.print_expr_maybe_paren(lhs, left_prec)?; |
| self.s.space()?; |
| self.word_space(op.node.to_string())?; |
| self.print_expr_maybe_paren(rhs, right_prec) |
| } |
| |
| fn print_expr_unary(&mut self, |
| op: ast::UnOp, |
| expr: &ast::Expr) -> io::Result<()> { |
| self.s.word(ast::UnOp::to_string(op))?; |
| self.print_expr_maybe_paren(expr, parser::PREC_PREFIX) |
| } |
| |
| fn print_expr_addr_of(&mut self, |
| mutability: ast::Mutability, |
| expr: &ast::Expr) -> io::Result<()> { |
| self.s.word("&")?; |
| self.print_mutability(mutability)?; |
| self.print_expr_maybe_paren(expr, parser::PREC_PREFIX) |
| } |
| |
| pub fn print_expr(&mut self, expr: &ast::Expr) -> io::Result<()> { |
| self.print_expr_outer_attr_style(expr, true) |
| } |
| |
| fn print_expr_outer_attr_style(&mut self, |
| expr: &ast::Expr, |
| is_inline: bool) -> io::Result<()> { |
| self.maybe_print_comment(expr.span.lo())?; |
| |
| let attrs = &expr.attrs; |
| if is_inline { |
| self.print_outer_attributes_inline(attrs)?; |
| } else { |
| self.print_outer_attributes(attrs)?; |
| } |
| |
| self.ibox(INDENT_UNIT)?; |
| self.ann.pre(self, NodeExpr(expr))?; |
| match expr.node { |
| ast::ExprKind::Box(ref expr) => { |
| self.word_space("box")?; |
| self.print_expr_maybe_paren(expr, parser::PREC_PREFIX)?; |
| } |
| ast::ExprKind::ObsoleteInPlace(ref place, ref expr) => { |
| let prec = AssocOp::ObsoleteInPlace.precedence() as i8; |
| self.print_expr_maybe_paren(place, prec + 1)?; |
| self.s.space()?; |
| self.word_space("<-")?; |
| self.print_expr_maybe_paren(expr, prec)?; |
| } |
| ast::ExprKind::Array(ref exprs) => { |
| self.print_expr_vec(&exprs[..], attrs)?; |
| } |
| ast::ExprKind::Repeat(ref element, ref count) => { |
| self.print_expr_repeat(element, count, attrs)?; |
| } |
| ast::ExprKind::Struct(ref path, ref fields, ref wth) => { |
| self.print_expr_struct(path, &fields[..], wth, attrs)?; |
| } |
| ast::ExprKind::Tup(ref exprs) => { |
| self.print_expr_tup(&exprs[..], attrs)?; |
| } |
| ast::ExprKind::Call(ref func, ref args) => { |
| self.print_expr_call(func, &args[..])?; |
| } |
| ast::ExprKind::MethodCall(ref segment, ref args) => { |
| self.print_expr_method_call(segment, &args[..])?; |
| } |
| ast::ExprKind::Binary(op, ref lhs, ref rhs) => { |
| self.print_expr_binary(op, lhs, rhs)?; |
| } |
| ast::ExprKind::Unary(op, ref expr) => { |
| self.print_expr_unary(op, expr)?; |
| } |
| ast::ExprKind::AddrOf(m, ref expr) => { |
| self.print_expr_addr_of(m, expr)?; |
| } |
| ast::ExprKind::Lit(ref lit) => { |
| self.print_literal(lit)?; |
| } |
| ast::ExprKind::Cast(ref expr, ref ty) => { |
| let prec = AssocOp::As.precedence() as i8; |
| self.print_expr_maybe_paren(expr, prec)?; |
| self.s.space()?; |
| self.word_space("as")?; |
| self.print_type(ty)?; |
| } |
| ast::ExprKind::Type(ref expr, ref ty) => { |
| let prec = AssocOp::Colon.precedence() as i8; |
| self.print_expr_maybe_paren(expr, prec)?; |
| self.word_space(":")?; |
| self.print_type(ty)?; |
| } |
| ast::ExprKind::If(ref test, ref blk, ref elseopt) => { |
| self.print_if(test, blk, elseopt.as_ref().map(|e| &**e))?; |
| } |
| ast::ExprKind::IfLet(ref pats, ref expr, ref blk, ref elseopt) => { |
| self.print_if_let(pats, expr, blk, elseopt.as_ref().map(|e| &**e))?; |
| } |
| ast::ExprKind::While(ref test, ref blk, opt_label) => { |
| if let Some(label) = opt_label { |
| self.print_ident(label.ident)?; |
| self.word_space(":")?; |
| } |
| self.head("while")?; |
| self.print_expr_as_cond(test)?; |
| self.s.space()?; |
| self.print_block_with_attrs(blk, attrs)?; |
| } |
| ast::ExprKind::WhileLet(ref pats, ref expr, ref blk, opt_label) => { |
| if let Some(label) = opt_label { |
| self.print_ident(label.ident)?; |
| self.word_space(":")?; |
| } |
| self.head("while let")?; |
| self.print_pats(pats)?; |
| self.s.space()?; |
| self.word_space("=")?; |
| self.print_expr_as_cond(expr)?; |
| self.s.space()?; |
| self.print_block_with_attrs(blk, attrs)?; |
| } |
| ast::ExprKind::ForLoop(ref pat, ref iter, ref blk, opt_label) => { |
| if let Some(label) = opt_label { |
| self.print_ident(label.ident)?; |
| self.word_space(":")?; |
| } |
| self.head("for")?; |
| self.print_pat(pat)?; |
| self.s.space()?; |
| self.word_space("in")?; |
| self.print_expr_as_cond(iter)?; |
| self.s.space()?; |
| self.print_block_with_attrs(blk, attrs)?; |
| } |
| ast::ExprKind::Loop(ref blk, opt_label) => { |
| if let Some(label) = opt_label { |
| self.print_ident(label.ident)?; |
| self.word_space(":")?; |
| } |
| self.head("loop")?; |
| self.s.space()?; |
| self.print_block_with_attrs(blk, attrs)?; |
| } |
| ast::ExprKind::Match(ref expr, ref arms) => { |
| self.cbox(INDENT_UNIT)?; |
| self.ibox(4)?; |
| self.word_nbsp("match")?; |
| self.print_expr_as_cond(expr)?; |
| self.s.space()?; |
| self.bopen()?; |
| self.print_inner_attributes_no_trailing_hardbreak(attrs)?; |
| for arm in arms { |
| self.print_arm(arm)?; |
| } |
| self.bclose_(expr.span, INDENT_UNIT)?; |
| } |
| ast::ExprKind::Closure( |
| capture_clause, asyncness, movability, ref decl, ref body, _) => { |
| self.print_movability(movability)?; |
| self.print_asyncness(asyncness)?; |
| self.print_capture_clause(capture_clause)?; |
| |
| self.print_fn_block_args(decl)?; |
| self.s.space()?; |
| 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)?; |
| } |
| ast::ExprKind::Block(ref blk, opt_label) => { |
| if let Some(label) = opt_label { |
| self.print_ident(label.ident)?; |
| self.word_space(":")?; |
| } |
| // 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_with_attrs(blk, attrs)?; |
| } |
| ast::ExprKind::Async(capture_clause, _, ref blk) => { |
| self.word_nbsp("async")?; |
| self.print_capture_clause(capture_clause)?; |
| self.s.space()?; |
| self.print_block_with_attrs(blk, attrs)?; |
| } |
| ast::ExprKind::Assign(ref lhs, ref rhs) => { |
| let prec = AssocOp::Assign.precedence() as i8; |
| self.print_expr_maybe_paren(lhs, prec + 1)?; |
| self.s.space()?; |
| self.word_space("=")?; |
| self.print_expr_maybe_paren(rhs, prec)?; |
| } |
| ast::ExprKind::AssignOp(op, ref lhs, ref rhs) => { |
| let prec = AssocOp::Assign.precedence() as i8; |
| self.print_expr_maybe_paren(lhs, prec + 1)?; |
| self.s.space()?; |
| self.s.word(op.node.to_string())?; |
| self.word_space("=")?; |
| self.print_expr_maybe_paren(rhs, prec)?; |
| } |
| ast::ExprKind::Field(ref expr, ident) => { |
| self.print_expr_maybe_paren(expr, parser::PREC_POSTFIX)?; |
| self.s.word(".")?; |
| self.print_ident(ident)?; |
| } |
| ast::ExprKind::Index(ref expr, ref index) => { |
| self.print_expr_maybe_paren(expr, parser::PREC_POSTFIX)?; |
| self.s.word("[")?; |
| self.print_expr(index)?; |
| self.s.word("]")?; |
| } |
| ast::ExprKind::Range(ref start, ref end, limits) => { |
| // Special case for `Range`. `AssocOp` claims that `Range` has higher precedence |
| // than `Assign`, but `x .. x = x` gives a parse error instead of `x .. (x = x)`. |
| // Here we use a fake precedence value so that any child with lower precedence than |
| // a "normal" binop gets parenthesized. (`LOr` is the lowest-precedence binop.) |
| let fake_prec = AssocOp::LOr.precedence() as i8; |
| if let Some(ref e) = *start { |
| self.print_expr_maybe_paren(e, fake_prec)?; |
| } |
| if limits == ast::RangeLimits::HalfOpen { |
| self.s.word("..")?; |
| } else { |
| self.s.word("..=")?; |
| } |
| if let Some(ref e) = *end { |
| self.print_expr_maybe_paren(e, fake_prec)?; |
| } |
| } |
| ast::ExprKind::Path(None, ref path) => { |
| self.print_path(path, true, 0)? |
| } |
| ast::ExprKind::Path(Some(ref qself), ref path) => { |
| self.print_qpath(path, qself, true)? |
| } |
| ast::ExprKind::Break(opt_label, ref opt_expr) => { |
| self.s.word("break")?; |
| self.s.space()?; |
| if let Some(label) = opt_label { |
| self.print_ident(label.ident)?; |
| self.s.space()?; |
| } |
| if let Some(ref expr) = *opt_expr { |
| self.print_expr_maybe_paren(expr, parser::PREC_JUMP)?; |
| self.s.space()?; |
| } |
| } |
| ast::ExprKind::Continue(opt_label) => { |
| self.s.word("continue")?; |
| self.s.space()?; |
| if let Some(label) = opt_label { |
| self.print_ident(label.ident)?; |
| self.s.space()? |
| } |
| } |
| ast::ExprKind::Ret(ref result) => { |
| self.s.word("return")?; |
| if let Some(ref expr) = *result { |
| self.s.word(" ")?; |
| self.print_expr_maybe_paren(expr, parser::PREC_JUMP)?; |
| } |
| } |
| ast::ExprKind::InlineAsm(ref a) => { |
| self.s.word("asm!")?; |
| self.popen()?; |
| self.print_string(&a.asm.as_str(), a.asm_str_style)?; |
| self.word_space(":")?; |
| |
| self.commasep(Inconsistent, &a.outputs, |s, out| { |
| let constraint = out.constraint.as_str(); |
| let mut ch = constraint.chars(); |
| match ch.next() { |
| Some('=') if out.is_rw => { |
| s.print_string(&format!("+{}", ch.as_str()), |
| ast::StrStyle::Cooked)? |
| } |
| _ => s.print_string(&constraint, ast::StrStyle::Cooked)? |
| } |
| s.popen()?; |
| s.print_expr(&out.expr)?; |
| s.pclose()?; |
| Ok(()) |
| })?; |
| self.s.space()?; |
| self.word_space(":")?; |
| |
| self.commasep(Inconsistent, &a.inputs, |s, &(co, ref o)| { |
| s.print_string(&co.as_str(), ast::StrStyle::Cooked)?; |
| s.popen()?; |
| s.print_expr(o)?; |
| s.pclose()?; |
| Ok(()) |
| })?; |
| self.s.space()?; |
| self.word_space(":")?; |
| |
| self.commasep(Inconsistent, &a.clobbers, |
| |s, co| { |
| s.print_string(&co.as_str(), 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() { |
| self.s.space()?; |
| self.word_space(":")?; |
| self.commasep(Inconsistent, &options, |
| |s, &co| { |
| s.print_string(co, ast::StrStyle::Cooked)?; |
| Ok(()) |
| })?; |
| } |
| |
| self.pclose()?; |
| } |
| ast::ExprKind::Mac(ref m) => self.print_mac(m)?, |
| ast::ExprKind::Paren(ref e) => { |
| self.popen()?; |
| self.print_inner_attributes_inline(attrs)?; |
| self.print_expr(e)?; |
| self.pclose()?; |
| }, |
| ast::ExprKind::Yield(ref e) => { |
| self.s.word("yield")?; |
| match *e { |
| Some(ref expr) => { |
| self.s.space()?; |
| self.print_expr_maybe_paren(expr, parser::PREC_JUMP)?; |
| } |
| _ => () |
| } |
| } |
| ast::ExprKind::Try(ref e) => { |
| self.print_expr_maybe_paren(e, parser::PREC_POSTFIX)?; |
| self.s.word("?")? |
| } |
| ast::ExprKind::Catch(ref blk) => { |
| self.head("do catch")?; |
| self.s.space()?; |
| self.print_block_with_attrs(blk, attrs)? |
| } |
| } |
| self.ann.post(self, NodeExpr(expr))?; |
| self.end() |
| } |
| |
| pub fn print_local_decl(&mut self, loc: &ast::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_ident(&mut self, ident: ast::Ident) -> io::Result<()> { |
| if ident.is_raw_guess() { |
| self.s.word(&format!("r#{}", ident))?; |
| } else { |
| self.s.word(&ident.as_str())?; |
| } |
| self.ann.post(self, NodeIdent(&ident)) |
| } |
| |
| pub fn print_usize(&mut self, i: usize) -> io::Result<()> { |
| self.s.word(&i.to_string()) |
| } |
| |
| pub fn print_name(&mut self, name: ast::Name) -> io::Result<()> { |
| self.s.word(&name.as_str())?; |
| self.ann.post(self, NodeName(&name)) |
| } |
| |
| pub fn print_for_decl(&mut self, loc: &ast::Local, |
| coll: &ast::Expr) -> io::Result<()> { |
| self.print_local_decl(loc)?; |
| self.s.space()?; |
| self.word_space("in")?; |
| self.print_expr(coll) |
| } |
| |
| fn print_path(&mut self, |
| path: &ast::Path, |
| colons_before_params: bool, |
| depth: usize) |
| -> io::Result<()> |
| { |
| self.maybe_print_comment(path.span.lo())?; |
| |
| for (i, segment) in path.segments[..path.segments.len() - depth].iter().enumerate() { |
| if i > 0 { |
| self.s.word("::")? |
| } |
| self.print_path_segment(segment, colons_before_params)?; |
| } |
| |
| Ok(()) |
| } |
| |
| fn print_path_segment(&mut self, |
| segment: &ast::PathSegment, |
| colons_before_params: bool) |
| -> io::Result<()> |
| { |
| if segment.ident.name != keywords::CrateRoot.name() && |
| segment.ident.name != keywords::DollarCrate.name() { |
| self.print_ident(segment.ident)?; |
| if let Some(ref args) = segment.args { |
| self.print_generic_args(args, colons_before_params)?; |
| } |
| } else if segment.ident.name == keywords::DollarCrate.name() { |
| self.print_dollar_crate(segment.ident.span.ctxt())?; |
| } |
| Ok(()) |
| } |
| |
| fn print_qpath(&mut self, |
| path: &ast::Path, |
| qself: &ast::QSelf, |
| colons_before_params: bool) |
| -> io::Result<()> |
| { |
| self.s.word("<")?; |
| self.print_type(&qself.ty)?; |
| if qself.position > 0 { |
| self.s.space()?; |
| self.word_space("as")?; |
| let depth = path.segments.len() - qself.position; |
| self.print_path(path, false, depth)?; |
| } |
| self.s.word(">")?; |
| self.s.word("::")?; |
| let item_segment = path.segments.last().unwrap(); |
| self.print_ident(item_segment.ident)?; |
| match item_segment.args { |
| Some(ref args) => self.print_generic_args(args, colons_before_params), |
| None => Ok(()), |
| } |
| } |
| |
| fn print_generic_args(&mut self, |
| args: &ast::GenericArgs, |
| colons_before_params: bool) |
| -> io::Result<()> |
| { |
| if colons_before_params { |
| self.s.word("::")? |
| } |
| |
| match *args { |
| ast::GenericArgs::AngleBracketed(ref data) => { |
| self.s.word("<")?; |
| |
| self.commasep(Inconsistent, &data.args, |s, generic_arg| { |
| s.print_generic_arg(generic_arg) |
| })?; |
| |
| let mut comma = data.args.len() != 0; |
| |
| for binding in data.bindings.iter() { |
| if comma { |
| self.word_space(",")? |
| } |
| self.print_ident(binding.ident)?; |
| self.s.space()?; |
| self.word_space("=")?; |
| self.print_type(&binding.ty)?; |
| comma = true; |
| } |
| |
| self.s.word(">")? |
| } |
| |
| ast::GenericArgs::Parenthesized(ref data) => { |
| self.s.word("(")?; |
| self.commasep( |
| Inconsistent, |
| &data.inputs, |
| |s, ty| s.print_type(ty))?; |
| self.s.word(")")?; |
| |
| 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: &ast::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 => self.s.word("_")?, |
| PatKind::Ident(binding_mode, ident, ref sub) => { |
| match binding_mode { |
| ast::BindingMode::ByRef(mutbl) => { |
| self.word_nbsp("ref")?; |
| self.print_mutability(mutbl)?; |
| } |
| ast::BindingMode::ByValue(ast::Mutability::Immutable) => {} |
| ast::BindingMode::ByValue(ast::Mutability::Mutable) => { |
| self.word_nbsp("mut")?; |
| } |
| } |
| self.print_ident(ident)?; |
| if let Some(ref p) = *sub { |
| self.s.word("@")?; |
| 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(",")?; |
| } |
| self.s.word("..")?; |
| if ddpos != elts.len() { |
| self.s.word(",")?; |
| 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_ident(f.node.ident)?; |
| 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(",")?; } |
| self.s.word("..")?; |
| } |
| self.s.space()?; |
| self.s.word("}")?; |
| } |
| 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(",")?; |
| } |
| self.s.word("..")?; |
| if ddpos != elts.len() { |
| self.s.word(",")?; |
| 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 { |
| self.s.word(",")?; |
| } |
| } |
| self.pclose()?; |
| } |
| PatKind::Box(ref inner) => { |
| self.s.word("box ")?; |
| self.print_pat(inner)?; |
| } |
| PatKind::Ref(ref inner, mutbl) => { |
| self.s.word("&")?; |
| if mutbl == ast::Mutability::Mutable { |
| self.s.word("mut ")?; |
| } |
| self.print_pat(inner)?; |
| } |
| PatKind::Lit(ref e) => self.print_expr(&**e)?, |
| PatKind::Range(ref begin, ref end, Spanned { node: ref end_kind, .. }) => { |
| self.print_expr(begin)?; |
| self.s.space()?; |
| match *end_kind { |
| RangeEnd::Included(RangeSyntax::DotDotDot) => self.s.word("...")?, |
| RangeEnd::Included(RangeSyntax::DotDotEq) => self.s.word("..=")?, |
| RangeEnd::Excluded => self.s.word("..")?, |
| } |
| self.print_expr(end)?; |
| } |
| PatKind::Slice(ref before, ref slice, ref after) => { |
| self.s.word("[")?; |
| self.commasep(Inconsistent, |
| &before[..], |
| |s, p| s.print_pat(p))?; |
| if let Some(ref p) = *slice { |
| if !before.is_empty() { self.word_space(",")?; } |
| if let PatKind::Wild = p.node { |
| // Print nothing |
| } else { |
| self.print_pat(p)?; |
| } |
| self.s.word("..")?; |
| if !after.is_empty() { self.word_space(",")?; } |
| } |
| self.commasep(Inconsistent, |
| &after[..], |
| |s, p| s.print_pat(p))?; |
| self.s.word("]")?; |
| } |
| PatKind::Paren(ref inner) => { |
| self.popen()?; |
| self.print_pat(inner)?; |
| self.pclose()?; |
| } |
| PatKind::Mac(ref m) => self.print_mac(m)?, |
| } |
| self.ann.post(self, NodePat(pat)) |
| } |
| |
| fn print_pats(&mut self, pats: &[P<ast::Pat>]) -> io::Result<()> { |
| let mut first = true; |
| for p in pats { |
| if first { |
| first = false; |
| } else { |
| self.s.space()?; |
| self.word_space("|")?; |
| } |
| self.print_pat(p)?; |
| } |
| Ok(()) |
| } |
| |
| fn print_arm(&mut self, arm: &ast::Arm) -> io::Result<()> { |
| // I have no idea why this check is necessary, but here it |
| // is :( |
| if arm.attrs.is_empty() { |
| self.s.space()?; |
| } |
| self.cbox(INDENT_UNIT)?; |
| self.ibox(0)?; |
| self.maybe_print_comment(arm.pats[0].span.lo())?; |
| self.print_outer_attributes(&arm.attrs)?; |
| self.print_pats(&arm.pats)?; |
| self.s.space()?; |
| if let Some(ref e) = arm.guard { |
| self.word_space("if")?; |
| self.print_expr(e)?; |
| self.s.space()?; |
| } |
| self.word_space("=>")?; |
| |
| match arm.body.node { |
| ast::ExprKind::Block(ref blk, opt_label) => { |
| if let Some(label) = opt_label { |
| self.print_ident(label.ident)?; |
| self.word_space(":")?; |
| } |
| |
| // 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 BlockCheckMode::Unsafe(ast::UserProvided) = blk.rules { |
| self.s.word(",")?; |
| } |
| } |
| _ => { |
| self.end()?; // close the ibox for the pattern |
| self.print_expr(&arm.body)?; |
| self.s.word(",")?; |
| } |
| } |
| self.end() // close enclosing cbox |
| } |
| |
| fn print_explicit_self(&mut self, explicit_self: &ast::ExplicitSelf) -> io::Result<()> { |
| match explicit_self.node { |
| SelfKind::Value(m) => { |
| self.print_mutability(m)?; |
| self.s.word("self") |
| } |
| SelfKind::Region(ref lt, m) => { |
| self.s.word("&")?; |
| self.print_opt_lifetime(lt)?; |
| self.print_mutability(m)?; |
| self.s.word("self") |
| } |
| SelfKind::Explicit(ref typ, m) => { |
| self.print_mutability(m)?; |
| self.s.word("self")?; |
| self.word_space(":")?; |
| self.print_type(typ) |
| } |
| } |
| } |
| |
| pub fn print_fn(&mut self, |
| decl: &ast::FnDecl, |
| header: ast::FnHeader, |
| name: Option<ast::Ident>, |
| generics: &ast::Generics, |
| vis: &ast::Visibility) -> io::Result<()> { |
| self.print_fn_header_info(header, vis)?; |
| |
| if let Some(name) = name { |
| self.nbsp()?; |
| self.print_ident(name)?; |
| } |
| self.print_generic_params(&generics.params)?; |
| self.print_fn_args_and_ret(decl)?; |
| self.print_where_clause(&generics.where_clause) |
| } |
| |
| pub fn print_fn_args_and_ret(&mut self, decl: &ast::FnDecl) |
| -> io::Result<()> { |
| self.popen()?; |
| self.commasep(Inconsistent, &decl.inputs, |s, arg| s.print_arg(arg, false))?; |
| if decl.variadic { |
| self.s.word(", ...")?; |
| } |
| self.pclose()?; |
| |
| self.print_fn_output(decl) |
| } |
| |
| pub fn print_fn_block_args( |
| &mut self, |
| decl: &ast::FnDecl) |
| -> io::Result<()> { |
| self.s.word("|")?; |
| self.commasep(Inconsistent, &decl.inputs, |s, arg| s.print_arg(arg, true))?; |
| self.s.word("|")?; |
| |
| if let ast::FunctionRetTy::Default(..) = decl.output { |
| return Ok(()); |
| } |
| |
| self.space_if_not_bol()?; |
| self.word_space("->")?; |
| match decl.output { |
| ast::FunctionRetTy::Ty(ref ty) => { |
| self.print_type(ty)?; |
| self.maybe_print_comment(ty.span.lo()) |
| } |
| ast::FunctionRetTy::Default(..) => unreachable!(), |
| } |
| } |
| |
| pub fn print_movability(&mut self, movability: ast::Movability) |
| -> io::Result<()> { |
| match movability { |
| ast::Movability::Static => self.word_space("static"), |
| ast::Movability::Movable => Ok(()), |
| } |
| } |
| |
| pub fn print_asyncness(&mut self, asyncness: ast::IsAsync) |
| -> io::Result<()> { |
| if asyncness.is_async() { |
| self.word_nbsp("async")?; |
| } |
| Ok(()) |
| } |
| |
| pub fn print_capture_clause(&mut self, capture_clause: ast::CaptureBy) |
| -> io::Result<()> { |
| match capture_clause { |
| ast::CaptureBy::Value => self.word_space("move"), |
| ast::CaptureBy::Ref => Ok(()), |
| } |
| } |
| |
| pub fn print_type_bounds(&mut self, |
| prefix: &str, |
| bounds: &[ast::GenericBound]) |
| -> io::Result<()> { |
| if !bounds.is_empty() { |
| self.s.word(prefix)?; |
| let mut first = true; |
| for bound in bounds { |
| if !(first && prefix.is_empty()) { |
| self.nbsp()?; |
| } |
| if first { |
| first = false; |
| } else { |
| self.word_space("+")?; |
| } |
| |
| match bound { |
| GenericBound::Trait(tref, modifier) => { |
| if modifier == &TraitBoundModifier::Maybe { |
| self.s.word("?")?; |
| } |
| self.print_poly_trait_ref(tref)?; |
| } |
| GenericBound::Outlives(lt) => self.print_lifetime(*lt)?, |
| } |
| } |
| } |
| Ok(()) |
| } |
| |
| pub fn print_lifetime(&mut self, lifetime: ast::Lifetime) -> io::Result<()> { |
| self.print_name(lifetime.ident.name) |
| } |
| |
| pub fn print_lifetime_bounds(&mut self, lifetime: ast::Lifetime, bounds: &ast::GenericBounds) |
| -> io::Result<()> |
| { |
| self.print_lifetime(lifetime)?; |
| if !bounds.is_empty() { |
| self.s.word(": ")?; |
| for (i, bound) in bounds.iter().enumerate() { |
| if i != 0 { |
| self.s.word(" + ")?; |
| } |
| match bound { |
| ast::GenericBound::Outlives(lt) => self.print_lifetime(*lt)?, |
| _ => panic!(), |
| } |
| } |
| } |
| Ok(()) |
| } |
| |
| pub fn print_generic_params( |
| &mut self, |
| generic_params: &[ast::GenericParam] |
| ) -> io::Result<()> { |
| if generic_params.is_empty() { |
| return Ok(()); |
| } |
| |
| self.s.word("<")?; |
| |
| self.commasep(Inconsistent, &generic_params, |s, param| { |
| match param.kind { |
| ast::GenericParamKind::Lifetime => { |
| s.print_outer_attributes_inline(¶m.attrs)?; |
| let lt = ast::Lifetime { id: param.id, ident: param.ident }; |
| s.print_lifetime_bounds(lt, ¶m.bounds) |
| }, |
| ast::GenericParamKind::Type { ref default } => { |
| s.print_outer_attributes_inline(¶m.attrs)?; |
| s.print_ident(param.ident)?; |
| s.print_type_bounds(":", ¶m.bounds)?; |
| match default { |
| Some(ref default) => { |
| s.s.space()?; |
| s.word_space("=")?; |
| s.print_type(default) |
| } |
| _ => Ok(()) |
| } |
| } |
| } |
| })?; |
| |
| self.s.word(">")?; |
| Ok(()) |
| } |
| |
| pub fn print_where_clause(&mut self, where_clause: &ast::WhereClause) |
| -> io::Result<()> { |
| if where_clause.predicates.is_empty() { |
| return Ok(()) |
| } |
| |
| self.s.space()?; |
| self.word_space("where")?; |
| |
| for (i, predicate) in where_clause.predicates.iter().enumerate() { |
| if i != 0 { |
| self.word_space(",")?; |
| } |
| |
| match *predicate { |
| ast::WherePredicate::BoundPredicate(ast::WhereBoundPredicate { |
| ref bound_generic_params, |
| ref bounded_ty, |
| ref bounds, |
| .. |
| }) => { |
| self.print_formal_generic_params(bound_generic_params)?; |
| self.print_type(bounded_ty)?; |
| self.print_type_bounds(":", bounds)?; |
| } |
| ast::WherePredicate::RegionPredicate(ast::WhereRegionPredicate{ref lifetime, |
| ref bounds, |
| ..}) => { |
| self.print_lifetime_bounds(*lifetime, bounds)?; |
| } |
| ast::WherePredicate::EqPredicate(ast::WhereEqPredicate{ref lhs_ty, |
| ref rhs_ty, |
| ..}) => { |
| self.print_type(lhs_ty)?; |
| self.s.space()?; |
| self.word_space("=")?; |
| self.print_type(rhs_ty)?; |
| } |
| } |
| } |
| |
| Ok(()) |
| } |
| |
| pub fn print_use_tree(&mut self, tree: &ast::UseTree) -> io::Result<()> { |
| match tree.kind { |
| ast::UseTreeKind::Simple(rename, ..) => { |
| self.print_path(&tree.prefix, false, 0)?; |
| if let Some(rename) = rename { |
| self.s.space()?; |
| self.word_space("as")?; |
| self.print_ident(rename)?; |
| } |
| } |
| ast::UseTreeKind::Glob => { |
| if !tree.prefix.segments.is_empty() { |
| self.print_path(&tree.prefix, false, 0)?; |
| self.s.word("::")?; |
| } |
| self.s.word("*")?; |
| } |
| ast::UseTreeKind::Nested(ref items) => { |
| if tree.prefix.segments.is_empty() { |
| self.s.word("{")?; |
| } else { |
| self.print_path(&tree.prefix, false, 0)?; |
| self.s.word("::{")?; |
| } |
| self.commasep(Inconsistent, &items[..], |this, &(ref tree, _)| { |
| this.print_use_tree(tree) |
| })?; |
| self.s.word("}")?; |
| } |
| } |
| |
| Ok(()) |
| } |
| |
| pub fn print_mutability(&mut self, |
| mutbl: ast::Mutability) -> io::Result<()> { |
| match mutbl { |
| ast::Mutability::Mutable => self.word_nbsp("mut"), |
| ast::Mutability::Immutable => Ok(()), |
| } |
| } |
| |
| pub fn print_mt(&mut self, mt: &ast::MutTy) -> io::Result<()> { |
| self.print_mutability(mt.mutbl)?; |
| self.print_type(&mt.ty) |
| } |
| |
| pub fn print_arg(&mut self, input: &ast::Arg, is_closure: bool) -> io::Result<()> { |
| self.ibox(INDENT_UNIT)?; |
| match input.ty.node { |
| ast::TyKind::Infer 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::Ident(_, ident, _) = input.pat.node { |
| ident.name == keywords::Invalid.name() |
| } else { |
| false |
| }; |
| if !invalid { |
| self.print_pat(&input.pat)?; |
| self.s.word(":")?; |
| self.s.space()?; |
| } |
| self.print_type(&input.ty)?; |
| } |
| } |
| } |
| self.end() |
| } |
| |
| pub fn print_fn_output(&mut self, decl: &ast::FnDecl) -> io::Result<()> { |
| if let ast::FunctionRetTy::Default(..) = decl.output { |
| return Ok(()); |
| } |
| |
| self.space_if_not_bol()?; |
| self.ibox(INDENT_UNIT)?; |
| self.word_space("->")?; |
| match decl.output { |
| ast::FunctionRetTy::Default(..) => unreachable!(), |
| ast::FunctionRetTy::Ty(ref ty) => |
| self.print_type(ty)? |
| } |
| self.end()?; |
| |
| match decl.output { |
| ast::FunctionRetTy::Ty(ref output) => self.maybe_print_comment(output.span.lo()), |
| _ => Ok(()) |
| } |
| } |
| |
| pub fn print_ty_fn(&mut self, |
| abi: abi::Abi, |
| unsafety: ast::Unsafety, |
| decl: &ast::FnDecl, |
| name: Option<ast::Ident>, |
| generic_params: &[ast::GenericParam]) |
| -> io::Result<()> { |
| self.ibox(INDENT_UNIT)?; |
| if !generic_params.is_empty() { |
| self.s.word("for")?; |
| self.print_generic_params(generic_params)?; |
| } |
| let generics = ast::Generics { |
| params: Vec::new(), |
| where_clause: ast::WhereClause { |
| id: ast::DUMMY_NODE_ID, |
| predicates: Vec::new(), |
| span: syntax_pos::DUMMY_SP, |
| }, |
| span: syntax_pos::DUMMY_SP, |
| }; |
| self.print_fn(decl, |
| ast::FnHeader { unsafety, abi, ..ast::FnHeader::default() }, |
| name, |
| &generics, |
| &codemap::dummy_spanned(ast::VisibilityKind::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 next = next_pos.unwrap_or(cmnt.pos + BytePos(1)); |
| if span.hi() < cmnt.pos && cmnt.pos < next && span_line.line == comment_line.line { |
| self.print_comment(cmnt)?; |
| } |
| } |
| 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() { |
| self.s.hardbreak()?; |
| } |
| while let Some(ref cmnt) = self.next_comment() { |
| self.print_comment(cmnt)?; |
| } |
| 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, |
| header: ast::FnHeader, |
| vis: &ast::Visibility) -> io::Result<()> { |
| self.s.word(&visibility_qualified(vis, ""))?; |
| |
| match header.constness.node { |
| ast::Constness::NotConst => {} |
| ast::Constness::Const => self.word_nbsp("const")? |
| } |
| |
| self.print_asyncness(header.asyncness)?; |
| self.print_unsafety(header.unsafety)?; |
| |
| if header.abi != Abi::Rust { |
| self.word_nbsp("extern")?; |
| self.word_nbsp(&header.abi.to_string())?; |
| } |
| |
| self.s.word("fn") |
| } |
| |
| pub fn print_unsafety(&mut self, s: ast::Unsafety) -> io::Result<()> { |
| match s { |
| ast::Unsafety::Normal => Ok(()), |
| ast::Unsafety::Unsafe => self.word_nbsp("unsafe"), |
| } |
| } |
| |
| pub fn print_is_auto(&mut self, s: ast::IsAuto) -> io::Result<()> { |
| match s { |
| ast::IsAuto::Yes => self.word_nbsp("auto"), |
| ast::IsAuto::No => Ok(()), |
| } |
| } |
| } |
| |
| #[cfg(test)] |
| mod tests { |
| use super::*; |
| |
| use ast; |
| use codemap; |
| use syntax_pos; |
| use with_globals; |
| |
| #[test] |
| fn test_fun_to_string() { |
| with_globals(|| { |
| let abba_ident = ast::Ident::from_str("abba"); |
| |
| let decl = ast::FnDecl { |
| inputs: Vec::new(), |
| output: ast::FunctionRetTy::Default(syntax_pos::DUMMY_SP), |
| variadic: false |
| }; |
| let generics = ast::Generics::default(); |
| assert_eq!( |
| fun_to_string( |
| &decl, |
| ast::FnHeader { |
| unsafety: ast::Unsafety::Normal, |
| constness: codemap::dummy_spanned(ast::Constness::NotConst), |
| asyncness: ast::IsAsync::NotAsync, |
| abi: Abi::Rust, |
| }, |
| abba_ident, |
| &generics |
| ), |
| "fn abba()" |
| ); |
| }) |
| } |
| |
| #[test] |
| fn test_variant_to_string() { |
| with_globals(|| { |
| let ident = ast::Ident::from_str("principal_skinner"); |
| |
| let var = codemap::respan(syntax_pos::DUMMY_SP, ast::Variant_ { |
| ident, |
| attrs: Vec::new(), |
| // making this up as I go.... ? |
| data: ast::VariantData::Unit(ast::DUMMY_NODE_ID), |
| disr_expr: None, |
| }); |
| |
| let varstr = variant_to_string(&var); |
| assert_eq!(varstr, "principal_skinner"); |
| }) |
| } |
| } |