diff options
Diffstat (limited to 'compiler/rustc_ast_pretty/src/pprust/state.rs')
-rw-r--r-- | compiler/rustc_ast_pretty/src/pprust/state.rs | 1770 |
1 files changed, 1770 insertions, 0 deletions
diff --git a/compiler/rustc_ast_pretty/src/pprust/state.rs b/compiler/rustc_ast_pretty/src/pprust/state.rs new file mode 100644 index 000000000..5eb7bf634 --- /dev/null +++ b/compiler/rustc_ast_pretty/src/pprust/state.rs @@ -0,0 +1,1770 @@ +mod delimited; +mod expr; +mod item; + +use crate::pp::Breaks::{Consistent, Inconsistent}; +use crate::pp::{self, Breaks}; + +use rustc_ast::ptr::P; +use rustc_ast::token::{self, BinOpToken, CommentKind, Delimiter, Nonterminal, Token, TokenKind}; +use rustc_ast::tokenstream::{TokenStream, TokenTree}; +use rustc_ast::util::classify; +use rustc_ast::util::comments::{gather_comments, Comment, CommentStyle}; +use rustc_ast::util::parser; +use rustc_ast::{self as ast, BlockCheckMode, PatKind, RangeEnd, RangeSyntax}; +use rustc_ast::{attr, Term}; +use rustc_ast::{GenericArg, MacArgs, MacArgsEq}; +use rustc_ast::{GenericBound, SelfKind, TraitBoundModifier}; +use rustc_ast::{InlineAsmOperand, InlineAsmRegOrRegClass}; +use rustc_ast::{InlineAsmOptions, InlineAsmTemplatePiece}; +use rustc_span::edition::Edition; +use rustc_span::source_map::{SourceMap, Spanned}; +use rustc_span::symbol::{kw, sym, Ident, IdentPrinter, Symbol}; +use rustc_span::{BytePos, FileName, Span}; + +use std::borrow::Cow; + +pub use self::delimited::IterDelimited; + +pub enum MacHeader<'a> { + Path(&'a ast::Path), + Keyword(&'static str), +} + +pub enum AnnNode<'a> { + Ident(&'a Ident), + Name(&'a Symbol), + Block(&'a ast::Block), + Item(&'a ast::Item), + SubItem(ast::NodeId), + Expr(&'a ast::Expr), + Pat(&'a ast::Pat), + Crate(&'a ast::Crate), +} + +pub trait PpAnn { + fn pre(&self, _state: &mut State<'_>, _node: AnnNode<'_>) {} + fn post(&self, _state: &mut State<'_>, _node: AnnNode<'_>) {} +} + +#[derive(Copy, Clone)] +pub struct NoAnn; + +impl PpAnn for NoAnn {} + +pub struct Comments<'a> { + sm: &'a SourceMap, + comments: Vec<Comment>, + current: usize, +} + +impl<'a> Comments<'a> { + pub fn new(sm: &'a SourceMap, filename: FileName, input: String) -> Comments<'a> { + let comments = gather_comments(sm, filename, input); + Comments { sm, comments, current: 0 } + } + + pub fn next(&self) -> Option<Comment> { + self.comments.get(self.current).cloned() + } + + pub fn trailing_comment( + &self, + span: rustc_span::Span, + next_pos: Option<BytePos>, + ) -> Option<Comment> { + if let Some(cmnt) = self.next() { + if cmnt.style != CommentStyle::Trailing { + return None; + } + let span_line = self.sm.lookup_char_pos(span.hi()); + let comment_line = self.sm.lookup_char_pos(cmnt.pos); + let next = next_pos.unwrap_or_else(|| cmnt.pos + BytePos(1)); + if span.hi() < cmnt.pos && cmnt.pos < next && span_line.line == comment_line.line { + return Some(cmnt); + } + } + + None + } +} + +pub struct State<'a> { + pub s: pp::Printer, + comments: Option<Comments<'a>>, + ann: &'a (dyn PpAnn + 'a), +} + +pub(crate) const INDENT_UNIT: isize = 4; + +/// Requires you to pass an input filename and reader so that +/// it can scan the input text for comments to copy forward. +pub fn print_crate<'a>( + sm: &'a SourceMap, + krate: &ast::Crate, + filename: FileName, + input: String, + ann: &'a dyn PpAnn, + is_expanded: bool, + edition: Edition, +) -> String { + let mut s = + State { s: pp::Printer::new(), comments: Some(Comments::new(sm, filename, input)), ann }; + + if is_expanded && !krate.attrs.iter().any(|attr| attr.has_name(sym::no_core)) { + // 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(Ident::with_dummy_span(sym::prelude_import)); + let list = attr::mk_list_item(Ident::with_dummy_span(sym::feature), vec![pi_nested]); + let fake_attr = attr::mk_attr_inner(list); + s.print_attribute(&fake_attr); + + // Currently, in Rust 2018 we don't have `extern crate std;` at the crate + // root, so this is not needed, and actually breaks things. + if edition == Edition::Edition2015 { + // `#![no_std]` + let no_std_meta = attr::mk_word_item(Ident::with_dummy_span(sym::no_std)); + let fake_attr = attr::mk_attr_inner(no_std_meta); + s.print_attribute(&fake_attr); + } + } + + s.print_inner_attributes(&krate.attrs); + for item in &krate.items { + s.print_item(item); + } + s.print_remaining_comments(); + s.ann.post(&mut s, AnnNode::Crate(krate)); + s.s.eof() +} + +/// This makes printed token streams look slightly nicer, +/// and also addresses some specific regressions described in #63896 and #73345. +fn tt_prepend_space(tt: &TokenTree, prev: &TokenTree) -> bool { + if let TokenTree::Token(token, _) = prev { + if matches!(token.kind, token::Dot | token::Dollar) { + return false; + } + if let token::DocComment(comment_kind, ..) = token.kind { + return comment_kind != CommentKind::Line; + } + } + match tt { + TokenTree::Token(token, _) => !matches!(token.kind, token::Comma | token::Not | token::Dot), + TokenTree::Delimited(_, Delimiter::Parenthesis, _) => { + !matches!(prev, TokenTree::Token(Token { kind: token::Ident(..), .. }, _)) + } + TokenTree::Delimited(_, Delimiter::Bracket, _) => { + !matches!(prev, TokenTree::Token(Token { kind: token::Pound, .. }, _)) + } + TokenTree::Delimited(..) => true, + } +} + +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 => ">>", + } +} + +fn doc_comment_to_string( + comment_kind: CommentKind, + attr_style: ast::AttrStyle, + data: Symbol, +) -> String { + match (comment_kind, attr_style) { + (CommentKind::Line, ast::AttrStyle::Outer) => format!("///{}", data), + (CommentKind::Line, ast::AttrStyle::Inner) => format!("//!{}", data), + (CommentKind::Block, ast::AttrStyle::Outer) => format!("/**{}*/", data), + (CommentKind::Block, ast::AttrStyle::Inner) => format!("/*!{}*/", data), + } +} + +pub fn literal_to_string(lit: token::Lit) -> String { + let token::Lit { kind, symbol, suffix } = lit; + let mut out = match kind { + token::Byte => format!("b'{}'", symbol), + token::Char => format!("'{}'", symbol), + token::Str => format!("\"{}\"", symbol), + token::StrRaw(n) => { + format!("r{delim}\"{string}\"{delim}", delim = "#".repeat(n as usize), string = symbol) + } + token::ByteStr => format!("b\"{}\"", symbol), + token::ByteStrRaw(n) => { + format!("br{delim}\"{string}\"{delim}", delim = "#".repeat(n as usize), string = symbol) + } + token::Integer | token::Float | token::Bool | token::Err => symbol.to_string(), + }; + + if let Some(suffix) = suffix { + out.push_str(suffix.as_str()) + } + + out +} + +impl std::ops::Deref for State<'_> { + type Target = pp::Printer; + fn deref(&self) -> &Self::Target { + &self.s + } +} + +impl std::ops::DerefMut for State<'_> { + fn deref_mut(&mut self) -> &mut Self::Target { + &mut self.s + } +} + +pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::DerefMut { + fn comments(&mut self) -> &mut Option<Comments<'a>>; + fn print_ident(&mut self, ident: Ident); + fn print_generic_args(&mut self, args: &ast::GenericArgs, colons_before_params: bool); + + fn strsep<T, F>( + &mut self, + sep: &'static str, + space_before: bool, + b: Breaks, + elts: &[T], + mut op: F, + ) where + F: FnMut(&mut Self, &T), + { + self.rbox(0, b); + if let Some((first, rest)) = elts.split_first() { + op(self, first); + for elt in rest { + if space_before { + self.space(); + } + self.word_space(sep); + op(self, elt); + } + } + self.end(); + } + + fn commasep<T, F>(&mut self, b: Breaks, elts: &[T], op: F) + where + F: FnMut(&mut Self, &T), + { + self.strsep(",", false, b, elts, op) + } + + fn maybe_print_comment(&mut self, pos: BytePos) -> bool { + let mut has_comment = false; + while let Some(ref cmnt) = self.next_comment() { + if cmnt.pos < pos { + has_comment = true; + self.print_comment(cmnt); + } else { + break; + } + } + has_comment + } + + fn print_comment(&mut self, cmnt: &Comment) { + match cmnt.style { + CommentStyle::Mixed => { + if !self.is_beginning_of_line() { + self.zerobreak(); + } + if let Some((last, lines)) = cmnt.lines.split_last() { + self.ibox(0); + + for line in lines { + self.word(line.clone()); + self.hardbreak() + } + + self.word(last.clone()); + self.space(); + + self.end(); + } + self.zerobreak() + } + CommentStyle::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.word(line.clone()); + } + self.hardbreak(); + } + } + CommentStyle::Trailing => { + if !self.is_beginning_of_line() { + self.word(" "); + } + if cmnt.lines.len() == 1 { + self.word(cmnt.lines[0].clone()); + self.hardbreak() + } else { + self.visual_align(); + for line in &cmnt.lines { + if !line.is_empty() { + self.word(line.clone()); + } + self.hardbreak(); + } + self.end(); + } + } + CommentStyle::BlankLine => { + // We need to do at least one, possibly two hardbreaks. + let twice = match self.last_token() { + Some(pp::Token::String(s)) => ";" == s, + Some(pp::Token::Begin(_)) => true, + Some(pp::Token::End) => true, + _ => false, + }; + if twice { + self.hardbreak(); + } + self.hardbreak(); + } + } + if let Some(cmnts) = self.comments() { + cmnts.current += 1; + } + } + + fn next_comment(&mut self) -> Option<Comment> { + self.comments().as_mut().and_then(|c| c.next()) + } + + fn maybe_print_trailing_comment(&mut self, span: rustc_span::Span, next_pos: Option<BytePos>) { + if let Some(cmnts) = self.comments() { + if let Some(cmnt) = cmnts.trailing_comment(span, next_pos) { + self.print_comment(&cmnt); + } + } + } + + fn print_remaining_comments(&mut self) { + // 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.hardbreak(); + } + while let Some(ref cmnt) = self.next_comment() { + self.print_comment(cmnt) + } + } + + fn print_literal(&mut self, lit: &ast::Lit) { + self.maybe_print_comment(lit.span.lo()); + self.word(lit.token.to_string()) + } + + fn print_string(&mut self, st: &str, style: ast::StrStyle) { + 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.word(st) + } + + fn print_symbol(&mut self, sym: Symbol, style: ast::StrStyle) { + self.print_string(sym.as_str(), style); + } + + fn print_inner_attributes(&mut self, attrs: &[ast::Attribute]) -> bool { + self.print_either_attributes(attrs, ast::AttrStyle::Inner, false, true) + } + + fn print_inner_attributes_no_trailing_hardbreak(&mut self, attrs: &[ast::Attribute]) -> bool { + self.print_either_attributes(attrs, ast::AttrStyle::Inner, false, false) + } + + fn print_outer_attributes(&mut self, attrs: &[ast::Attribute]) -> bool { + self.print_either_attributes(attrs, ast::AttrStyle::Outer, false, true) + } + + fn print_inner_attributes_inline(&mut self, attrs: &[ast::Attribute]) -> bool { + self.print_either_attributes(attrs, ast::AttrStyle::Inner, true, true) + } + + fn print_outer_attributes_inline(&mut self, attrs: &[ast::Attribute]) -> bool { + 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, + ) -> bool { + let mut printed = false; + for attr in attrs { + if attr.style == kind { + self.print_attribute_inline(attr, is_inline); + if is_inline { + self.nbsp(); + } + printed = true; + } + } + if printed && trailing_hardbreak && !is_inline { + self.hardbreak_if_not_bol(); + } + printed + } + + fn print_attribute(&mut self, attr: &ast::Attribute) { + self.print_attribute_inline(attr, false) + } + + fn print_attribute_inline(&mut self, attr: &ast::Attribute, is_inline: bool) { + if !is_inline { + self.hardbreak_if_not_bol(); + } + self.maybe_print_comment(attr.span.lo()); + match attr.kind { + ast::AttrKind::Normal(ref item, _) => { + match attr.style { + ast::AttrStyle::Inner => self.word("#!["), + ast::AttrStyle::Outer => self.word("#["), + } + self.print_attr_item(&item, attr.span); + self.word("]"); + } + ast::AttrKind::DocComment(comment_kind, data) => { + self.word(doc_comment_to_string(comment_kind, attr.style, data)); + self.hardbreak() + } + } + } + + fn print_attr_item(&mut self, item: &ast::AttrItem, span: Span) { + self.ibox(0); + match &item.args { + MacArgs::Delimited(_, delim, tokens) => self.print_mac_common( + Some(MacHeader::Path(&item.path)), + false, + None, + Some(delim.to_token()), + tokens, + true, + span, + ), + MacArgs::Empty => { + self.print_path(&item.path, false, 0); + } + MacArgs::Eq(_, MacArgsEq::Ast(expr)) => { + self.print_path(&item.path, false, 0); + self.space(); + self.word_space("="); + let token_str = self.expr_to_string(expr); + self.word(token_str); + } + MacArgs::Eq(_, MacArgsEq::Hir(lit)) => { + self.print_path(&item.path, false, 0); + self.space(); + self.word_space("="); + let token_str = self.literal_to_string(lit); + self.word(token_str); + } + } + self.end(); + } + + fn print_meta_list_item(&mut self, item: &ast::NestedMetaItem) { + match item { + ast::NestedMetaItem::MetaItem(ref mi) => self.print_meta_item(mi), + ast::NestedMetaItem::Literal(ref lit) => self.print_literal(lit), + } + } + + fn print_meta_item(&mut self, item: &ast::MetaItem) { + self.ibox(INDENT_UNIT); + match item.kind { + ast::MetaItemKind::Word => self.print_path(&item.path, false, 0), + ast::MetaItemKind::NameValue(ref value) => { + self.print_path(&item.path, false, 0); + self.space(); + self.word_space("="); + self.print_literal(value); + } + ast::MetaItemKind::List(ref items) => { + self.print_path(&item.path, false, 0); + 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: &TokenTree, convert_dollar_crate: bool) { + match tt { + TokenTree::Token(token, _) => { + let token_str = self.token_to_string_ext(&token, convert_dollar_crate); + self.word(token_str); + if let token::DocComment(..) = token.kind { + self.hardbreak() + } + } + TokenTree::Delimited(dspan, delim, tts) => { + self.print_mac_common( + None, + false, + None, + Some(*delim), + tts, + convert_dollar_crate, + dspan.entire(), + ); + } + } + } + + fn print_tts(&mut self, tts: &TokenStream, convert_dollar_crate: bool) { + let mut iter = tts.trees().peekable(); + while let Some(tt) = iter.next() { + self.print_tt(tt, convert_dollar_crate); + if let Some(next) = iter.peek() { + if tt_prepend_space(next, tt) { + self.space(); + } + } + } + } + + fn print_mac_common( + &mut self, + header: Option<MacHeader<'_>>, + has_bang: bool, + ident: Option<Ident>, + delim: Option<Delimiter>, + tts: &TokenStream, + convert_dollar_crate: bool, + span: Span, + ) { + if delim == Some(Delimiter::Brace) { + self.cbox(INDENT_UNIT); + } + match header { + Some(MacHeader::Path(path)) => self.print_path(path, false, 0), + Some(MacHeader::Keyword(kw)) => self.word(kw), + None => {} + } + if has_bang { + self.word("!"); + } + if let Some(ident) = ident { + self.nbsp(); + self.print_ident(ident); + } + match delim { + Some(Delimiter::Brace) => { + if header.is_some() || has_bang || ident.is_some() { + self.nbsp(); + } + self.word("{"); + if !tts.is_empty() { + self.space(); + } + self.ibox(0); + self.print_tts(tts, convert_dollar_crate); + self.end(); + let empty = tts.is_empty(); + self.bclose(span, empty); + } + Some(delim) => { + let token_str = self.token_kind_to_string(&token::OpenDelim(delim)); + self.word(token_str); + self.ibox(0); + self.print_tts(tts, convert_dollar_crate); + self.end(); + let token_str = self.token_kind_to_string(&token::CloseDelim(delim)); + self.word(token_str); + } + None => { + self.ibox(0); + self.print_tts(tts, convert_dollar_crate); + self.end(); + } + } + } + + fn print_mac_def( + &mut self, + macro_def: &ast::MacroDef, + ident: &Ident, + sp: Span, + print_visibility: impl FnOnce(&mut Self), + ) { + let (kw, has_bang) = if macro_def.macro_rules { + ("macro_rules", true) + } else { + print_visibility(self); + ("macro", false) + }; + self.print_mac_common( + Some(MacHeader::Keyword(kw)), + has_bang, + Some(*ident), + macro_def.body.delim(), + ¯o_def.body.inner_tokens(), + true, + sp, + ); + if macro_def.body.need_semicolon() { + self.word(";"); + } + } + + fn print_path(&mut self, path: &ast::Path, colons_before_params: bool, depth: usize) { + self.maybe_print_comment(path.span.lo()); + + for (i, segment) in path.segments[..path.segments.len() - depth].iter().enumerate() { + if i > 0 { + self.word("::") + } + self.print_path_segment(segment, colons_before_params); + } + } + + fn print_path_segment(&mut self, segment: &ast::PathSegment, colons_before_params: bool) { + if segment.ident.name != kw::PathRoot { + self.print_ident(segment.ident); + if let Some(ref args) = segment.args { + self.print_generic_args(args, colons_before_params); + } + } + } + + fn head<S: Into<Cow<'static, str>>>(&mut self, w: S) { + let w = w.into(); + // Outer-box is consistent. + self.cbox(INDENT_UNIT); + // Head-box is inconsistent. + self.ibox(0); + // Keyword that starts the head. + if !w.is_empty() { + self.word_nbsp(w); + } + } + + fn bopen(&mut self) { + self.word("{"); + self.end(); // Close the head-box. + } + + fn bclose_maybe_open(&mut self, span: rustc_span::Span, empty: bool, close_box: bool) { + let has_comment = self.maybe_print_comment(span.hi()); + if !empty || has_comment { + self.break_offset_if_not_bol(1, -(INDENT_UNIT as isize)); + } + self.word("}"); + if close_box { + self.end(); // Close the outer-box. + } + } + + fn bclose(&mut self, span: rustc_span::Span, empty: bool) { + let close_box = true; + self.bclose_maybe_open(span, empty, close_box) + } + + fn break_offset_if_not_bol(&mut self, n: usize, off: isize) { + if !self.is_beginning_of_line() { + self.break_offset(n, off) + } else if off != 0 { + if let Some(last_token) = self.last_token_still_buffered() { + if 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.replace_last_token_still_buffered(pp::Printer::hardbreak_tok_offset(off)); + } + } + } + } + + fn nonterminal_to_string(&self, nt: &Nonterminal) -> String { + match *nt { + token::NtExpr(ref e) => self.expr_to_string(e), + token::NtMeta(ref e) => self.attr_item_to_string(e), + token::NtTy(ref e) => self.ty_to_string(e), + token::NtPath(ref e) => self.path_to_string(e), + token::NtItem(ref e) => self.item_to_string(e), + token::NtBlock(ref e) => self.block_to_string(e), + token::NtStmt(ref e) => self.stmt_to_string(e), + token::NtPat(ref e) => self.pat_to_string(e), + token::NtIdent(e, is_raw) => IdentPrinter::for_ast_ident(e, is_raw).to_string(), + token::NtLifetime(e) => e.to_string(), + token::NtLiteral(ref e) => self.expr_to_string(e), + token::NtVis(ref e) => self.vis_to_string(e), + } + } + + /// Print the token kind precisely, without converting `$crate` into its respective crate name. + fn token_kind_to_string(&self, tok: &TokenKind) -> Cow<'static, str> { + self.token_kind_to_string_ext(tok, None) + } + + fn token_kind_to_string_ext( + &self, + tok: &TokenKind, + convert_dollar_crate: Option<Span>, + ) -> Cow<'static, str> { + match *tok { + token::Eq => "=".into(), + token::Lt => "<".into(), + token::Le => "<=".into(), + token::EqEq => "==".into(), + token::Ne => "!=".into(), + token::Ge => ">=".into(), + token::Gt => ">".into(), + token::Not => "!".into(), + token::Tilde => "~".into(), + token::OrOr => "||".into(), + token::AndAnd => "&&".into(), + token::BinOp(op) => binop_to_string(op).into(), + token::BinOpEq(op) => format!("{}=", binop_to_string(op)).into(), + + /* Structural symbols */ + token::At => "@".into(), + token::Dot => ".".into(), + token::DotDot => "..".into(), + token::DotDotDot => "...".into(), + token::DotDotEq => "..=".into(), + token::Comma => ",".into(), + token::Semi => ";".into(), + token::Colon => ":".into(), + token::ModSep => "::".into(), + token::RArrow => "->".into(), + token::LArrow => "<-".into(), + token::FatArrow => "=>".into(), + token::OpenDelim(Delimiter::Parenthesis) => "(".into(), + token::CloseDelim(Delimiter::Parenthesis) => ")".into(), + token::OpenDelim(Delimiter::Bracket) => "[".into(), + token::CloseDelim(Delimiter::Bracket) => "]".into(), + token::OpenDelim(Delimiter::Brace) => "{".into(), + token::CloseDelim(Delimiter::Brace) => "}".into(), + token::OpenDelim(Delimiter::Invisible) | token::CloseDelim(Delimiter::Invisible) => { + "".into() + } + token::Pound => "#".into(), + token::Dollar => "$".into(), + token::Question => "?".into(), + token::SingleQuote => "'".into(), + + /* Literals */ + token::Literal(lit) => literal_to_string(lit).into(), + + /* Name components */ + token::Ident(s, is_raw) => { + IdentPrinter::new(s, is_raw, convert_dollar_crate).to_string().into() + } + token::Lifetime(s) => s.to_string().into(), + + /* Other */ + token::DocComment(comment_kind, attr_style, data) => { + doc_comment_to_string(comment_kind, attr_style, data).into() + } + token::Eof => "<eof>".into(), + + token::Interpolated(ref nt) => self.nonterminal_to_string(nt).into(), + } + } + + /// Print the token precisely, without converting `$crate` into its respective crate name. + fn token_to_string(&self, token: &Token) -> Cow<'static, str> { + self.token_to_string_ext(token, false) + } + + fn token_to_string_ext(&self, token: &Token, convert_dollar_crate: bool) -> Cow<'static, str> { + let convert_dollar_crate = convert_dollar_crate.then_some(token.span); + self.token_kind_to_string_ext(&token.kind, convert_dollar_crate) + } + + fn ty_to_string(&self, ty: &ast::Ty) -> String { + Self::to_string(|s| s.print_type(ty)) + } + + fn bounds_to_string(&self, bounds: &[ast::GenericBound]) -> String { + Self::to_string(|s| s.print_type_bounds(bounds)) + } + + fn pat_to_string(&self, pat: &ast::Pat) -> String { + Self::to_string(|s| s.print_pat(pat)) + } + + fn expr_to_string(&self, e: &ast::Expr) -> String { + Self::to_string(|s| s.print_expr(e)) + } + + fn literal_to_string(&self, lit: &ast::Lit) -> String { + Self::to_string(|s| s.print_literal(lit)) + } + + fn tt_to_string(&self, tt: &TokenTree) -> String { + Self::to_string(|s| s.print_tt(tt, false)) + } + + fn tts_to_string(&self, tokens: &TokenStream) -> String { + Self::to_string(|s| s.print_tts(tokens, false)) + } + + fn stmt_to_string(&self, stmt: &ast::Stmt) -> String { + Self::to_string(|s| s.print_stmt(stmt)) + } + + fn item_to_string(&self, i: &ast::Item) -> String { + Self::to_string(|s| s.print_item(i)) + } + + fn assoc_item_to_string(&self, i: &ast::AssocItem) -> String { + Self::to_string(|s| s.print_assoc_item(i)) + } + + fn foreign_item_to_string(&self, i: &ast::ForeignItem) -> String { + Self::to_string(|s| s.print_foreign_item(i)) + } + + fn generic_params_to_string(&self, generic_params: &[ast::GenericParam]) -> String { + Self::to_string(|s| s.print_generic_params(generic_params)) + } + + fn path_to_string(&self, p: &ast::Path) -> String { + Self::to_string(|s| s.print_path(p, false, 0)) + } + + fn path_segment_to_string(&self, p: &ast::PathSegment) -> String { + Self::to_string(|s| s.print_path_segment(p, false)) + } + + fn vis_to_string(&self, v: &ast::Visibility) -> String { + Self::to_string(|s| s.print_visibility(v)) + } + + fn block_to_string(&self, blk: &ast::Block) -> String { + Self::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) + }) + } + + fn meta_list_item_to_string(&self, li: &ast::NestedMetaItem) -> String { + Self::to_string(|s| s.print_meta_list_item(li)) + } + + fn attr_item_to_string(&self, ai: &ast::AttrItem) -> String { + Self::to_string(|s| s.print_attr_item(ai, ai.path.span)) + } + + fn attribute_to_string(&self, attr: &ast::Attribute) -> String { + Self::to_string(|s| s.print_attribute(attr)) + } + + fn param_to_string(&self, arg: &ast::Param) -> String { + Self::to_string(|s| s.print_param(arg, false)) + } + + fn to_string(f: impl FnOnce(&mut State<'_>)) -> String { + let mut printer = State::new(); + f(&mut printer); + printer.s.eof() + } +} + +impl<'a> PrintState<'a> for State<'a> { + fn comments(&mut self) -> &mut Option<Comments<'a>> { + &mut self.comments + } + + fn print_ident(&mut self, ident: Ident) { + self.word(IdentPrinter::for_ast_ident(ident, ident.is_raw_guess()).to_string()); + self.ann.post(self, AnnNode::Ident(&ident)) + } + + fn print_generic_args(&mut self, args: &ast::GenericArgs, colons_before_params: bool) { + if colons_before_params { + self.word("::") + } + + match *args { + ast::GenericArgs::AngleBracketed(ref data) => { + self.word("<"); + self.commasep(Inconsistent, &data.args, |s, arg| match arg { + ast::AngleBracketedArg::Arg(a) => s.print_generic_arg(a), + ast::AngleBracketedArg::Constraint(c) => s.print_assoc_constraint(c), + }); + self.word(">") + } + + ast::GenericArgs::Parenthesized(ref data) => { + self.word("("); + self.commasep(Inconsistent, &data.inputs, |s, ty| s.print_type(ty)); + self.word(")"); + self.print_fn_ret_ty(&data.output); + } + } + } +} + +impl<'a> State<'a> { + pub fn new() -> State<'a> { + State { s: pp::Printer::new(), comments: None, ann: &NoAnn } + } + + pub(crate) fn commasep_cmnt<T, F, G>( + &mut self, + b: Breaks, + elts: &[T], + mut op: F, + mut get_span: G, + ) where + F: FnMut(&mut State<'_>, &T), + G: FnMut(&T) -> rustc_span::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.word(","); + self.maybe_print_trailing_comment(get_span(elt), Some(get_span(&elts[i]).hi())); + self.space_if_not_bol(); + } + } + self.end(); + } + + pub(crate) fn commasep_exprs(&mut self, b: Breaks, exprs: &[P<ast::Expr>]) { + self.commasep_cmnt(b, exprs, |s, e| s.print_expr(e), |e| e.span) + } + + pub fn print_opt_lifetime(&mut self, lifetime: &Option<ast::Lifetime>) { + if let Some(lt) = *lifetime { + self.print_lifetime(lt); + self.nbsp(); + } + } + + pub fn print_assoc_constraint(&mut self, constraint: &ast::AssocConstraint) { + self.print_ident(constraint.ident); + constraint.gen_args.as_ref().map(|args| self.print_generic_args(args, false)); + self.space(); + match &constraint.kind { + ast::AssocConstraintKind::Equality { term } => { + self.word_space("="); + match term { + Term::Ty(ty) => self.print_type(ty), + Term::Const(c) => self.print_expr_anon_const(c, &[]), + } + } + ast::AssocConstraintKind::Bound { bounds } => { + if !bounds.is_empty() { + self.word_nbsp(":"); + self.print_type_bounds(&bounds); + } + } + } + } + + pub fn print_generic_arg(&mut self, generic_arg: &GenericArg) { + match generic_arg { + GenericArg::Lifetime(lt) => self.print_lifetime(*lt), + GenericArg::Type(ty) => self.print_type(ty), + GenericArg::Const(ct) => self.print_expr(&ct.value), + } + } + + pub fn print_type(&mut self, ty: &ast::Ty) { + self.maybe_print_comment(ty.span.lo()); + self.ibox(0); + match ty.kind { + ast::TyKind::Slice(ref ty) => { + self.word("["); + self.print_type(ty); + self.word("]"); + } + ast::TyKind::Ptr(ref mt) => { + self.word("*"); + self.print_mt(mt, true); + } + ast::TyKind::Rptr(ref lifetime, ref mt) => { + self.word("&"); + self.print_opt_lifetime(lifetime); + self.print_mt(mt, false); + } + ast::TyKind::Never => { + self.word("!"); + } + ast::TyKind::Tup(ref elts) => { + self.popen(); + self.commasep(Inconsistent, &elts, |s, ty| s.print_type(ty)); + if elts.len() == 1 { + self.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.ext, 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) => { + if syntax == ast::TraitObjectSyntax::Dyn { + self.word_nbsp("dyn"); + } + self.print_type_bounds(bounds); + } + ast::TyKind::ImplTrait(_, ref bounds) => { + self.word_nbsp("impl"); + self.print_type_bounds(bounds); + } + ast::TyKind::Array(ref ty, ref length) => { + self.word("["); + self.print_type(ty); + self.word("; "); + self.print_expr(&length.value); + self.word("]"); + } + ast::TyKind::Typeof(ref e) => { + self.word("typeof("); + self.print_expr(&e.value); + self.word(")"); + } + ast::TyKind::Infer => { + self.word("_"); + } + ast::TyKind::Err => { + self.popen(); + self.word("/*ERROR*/"); + self.pclose(); + } + ast::TyKind::ImplicitSelf => { + self.word("Self"); + } + ast::TyKind::MacCall(ref m) => { + self.print_mac(m); + } + ast::TyKind::CVarArgs => { + self.word("..."); + } + } + self.end(); + } + + fn print_trait_ref(&mut self, t: &ast::TraitRef) { + self.print_path(&t.path, false, 0) + } + + fn print_formal_generic_params(&mut self, generic_params: &[ast::GenericParam]) { + if !generic_params.is_empty() { + self.word("for"); + self.print_generic_params(generic_params); + self.nbsp(); + } + } + + fn print_poly_trait_ref(&mut self, t: &ast::PolyTraitRef) { + self.print_formal_generic_params(&t.bound_generic_params); + self.print_trait_ref(&t.trait_ref) + } + + pub(crate) fn print_stmt(&mut self, st: &ast::Stmt) { + self.maybe_print_comment(st.span.lo()); + match st.kind { + 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((init, els)) = loc.kind.init_else_opt() { + self.nbsp(); + self.word_space("="); + self.print_expr(init); + if let Some(els) = els { + self.cbox(INDENT_UNIT); + self.ibox(INDENT_UNIT); + self.word(" else "); + self.print_block(els); + } + } + self.word(";"); + self.end(); // `let` ibox + } + 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 classify::expr_requires_semi_to_be_stmt(expr) { + self.word(";"); + } + } + ast::StmtKind::Semi(ref expr) => { + self.space_if_not_bol(); + self.print_expr_outer_attr_style(expr, false); + self.word(";"); + } + ast::StmtKind::Empty => { + self.space_if_not_bol(); + self.word(";"); + } + ast::StmtKind::MacCall(ref mac) => { + self.space_if_not_bol(); + self.print_outer_attributes(&mac.attrs); + self.print_mac(&mac.mac); + if mac.style == ast::MacStmtStyle::Semicolon { + self.word(";"); + } + } + } + self.maybe_print_trailing_comment(st.span, None) + } + + pub(crate) fn print_block(&mut self, blk: &ast::Block) { + self.print_block_with_attrs(blk, &[]) + } + + pub(crate) fn print_block_unclosed_indent(&mut self, blk: &ast::Block) { + self.print_block_maybe_unclosed(blk, &[], false) + } + + pub(crate) fn print_block_with_attrs(&mut self, blk: &ast::Block, attrs: &[ast::Attribute]) { + self.print_block_maybe_unclosed(blk, attrs, true) + } + + pub(crate) fn print_block_maybe_unclosed( + &mut self, + blk: &ast::Block, + attrs: &[ast::Attribute], + close_box: bool, + ) { + match blk.rules { + BlockCheckMode::Unsafe(..) => self.word_space("unsafe"), + BlockCheckMode::Default => (), + } + self.maybe_print_comment(blk.span.lo()); + self.ann.pre(self, AnnNode::Block(blk)); + self.bopen(); + + let has_attrs = self.print_inner_attributes(attrs); + + for (i, st) in blk.stmts.iter().enumerate() { + match st.kind { + 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), + } + } + + let empty = !has_attrs && blk.stmts.is_empty(); + self.bclose_maybe_open(blk.span, empty, close_box); + self.ann.post(self, AnnNode::Block(blk)) + } + + /// Print a `let pat = expr` expression. + pub(crate) fn print_let(&mut self, pat: &ast::Pat, expr: &ast::Expr) { + self.word("let "); + self.print_pat(pat); + self.space(); + self.word_space("="); + let npals = || parser::needs_par_as_let_scrutinee(expr.precedence().order()); + self.print_expr_cond_paren(expr, Self::cond_needs_par(expr) || npals()) + } + + pub(crate) fn print_mac(&mut self, m: &ast::MacCall) { + self.print_mac_common( + Some(MacHeader::Path(&m.path)), + true, + None, + m.args.delim(), + &m.args.inner_tokens(), + true, + m.span(), + ); + } + + fn print_inline_asm(&mut self, asm: &ast::InlineAsm) { + enum AsmArg<'a> { + Template(String), + Operand(&'a InlineAsmOperand), + ClobberAbi(Symbol), + Options(InlineAsmOptions), + } + + let mut args = vec![AsmArg::Template(InlineAsmTemplatePiece::to_string(&asm.template))]; + args.extend(asm.operands.iter().map(|(o, _)| AsmArg::Operand(o))); + for (abi, _) in &asm.clobber_abis { + args.push(AsmArg::ClobberAbi(*abi)); + } + if !asm.options.is_empty() { + args.push(AsmArg::Options(asm.options)); + } + + self.popen(); + self.commasep(Consistent, &args, |s, arg| match arg { + AsmArg::Template(template) => s.print_string(&template, ast::StrStyle::Cooked), + AsmArg::Operand(op) => { + let print_reg_or_class = |s: &mut Self, r: &InlineAsmRegOrRegClass| match r { + InlineAsmRegOrRegClass::Reg(r) => s.print_symbol(*r, ast::StrStyle::Cooked), + InlineAsmRegOrRegClass::RegClass(r) => s.word(r.to_string()), + }; + match op { + InlineAsmOperand::In { reg, expr } => { + s.word("in"); + s.popen(); + print_reg_or_class(s, reg); + s.pclose(); + s.space(); + s.print_expr(expr); + } + InlineAsmOperand::Out { reg, late, expr } => { + s.word(if *late { "lateout" } else { "out" }); + s.popen(); + print_reg_or_class(s, reg); + s.pclose(); + s.space(); + match expr { + Some(expr) => s.print_expr(expr), + None => s.word("_"), + } + } + InlineAsmOperand::InOut { reg, late, expr } => { + s.word(if *late { "inlateout" } else { "inout" }); + s.popen(); + print_reg_or_class(s, reg); + s.pclose(); + s.space(); + s.print_expr(expr); + } + InlineAsmOperand::SplitInOut { reg, late, in_expr, out_expr } => { + s.word(if *late { "inlateout" } else { "inout" }); + s.popen(); + print_reg_or_class(s, reg); + s.pclose(); + s.space(); + s.print_expr(in_expr); + s.space(); + s.word_space("=>"); + match out_expr { + Some(out_expr) => s.print_expr(out_expr), + None => s.word("_"), + } + } + InlineAsmOperand::Const { anon_const } => { + s.word("const"); + s.space(); + s.print_expr(&anon_const.value); + } + InlineAsmOperand::Sym { sym } => { + s.word("sym"); + s.space(); + if let Some(qself) = &sym.qself { + s.print_qpath(&sym.path, qself, true); + } else { + s.print_path(&sym.path, true, 0); + } + } + } + } + AsmArg::ClobberAbi(abi) => { + s.word("clobber_abi"); + s.popen(); + s.print_symbol(*abi, ast::StrStyle::Cooked); + s.pclose(); + } + AsmArg::Options(opts) => { + s.word("options"); + s.popen(); + let mut options = vec![]; + if opts.contains(InlineAsmOptions::PURE) { + options.push("pure"); + } + if opts.contains(InlineAsmOptions::NOMEM) { + options.push("nomem"); + } + if opts.contains(InlineAsmOptions::READONLY) { + options.push("readonly"); + } + if opts.contains(InlineAsmOptions::PRESERVES_FLAGS) { + options.push("preserves_flags"); + } + if opts.contains(InlineAsmOptions::NORETURN) { + options.push("noreturn"); + } + if opts.contains(InlineAsmOptions::NOSTACK) { + options.push("nostack"); + } + if opts.contains(InlineAsmOptions::ATT_SYNTAX) { + options.push("att_syntax"); + } + if opts.contains(InlineAsmOptions::RAW) { + options.push("raw"); + } + if opts.contains(InlineAsmOptions::MAY_UNWIND) { + options.push("may_unwind"); + } + s.commasep(Inconsistent, &options, |s, &opt| { + s.word(opt); + }); + s.pclose(); + } + }); + self.pclose(); + } + + pub(crate) fn print_local_decl(&mut self, loc: &ast::Local) { + self.print_pat(&loc.pat); + if let Some(ref ty) = loc.ty { + self.word_space(":"); + self.print_type(ty); + } + } + + pub(crate) fn print_name(&mut self, name: Symbol) { + self.word(name.to_string()); + self.ann.post(self, AnnNode::Name(&name)) + } + + fn print_qpath(&mut self, path: &ast::Path, qself: &ast::QSelf, colons_before_params: bool) { + self.word("<"); + self.print_type(&qself.ty); + if qself.position > 0 { + self.space(); + self.word_space("as"); + let depth = path.segments.len() - qself.position; + self.print_path(path, false, depth); + } + self.word(">"); + for item_segment in &path.segments[qself.position..] { + self.word("::"); + self.print_ident(item_segment.ident); + if let Some(ref args) = item_segment.args { + self.print_generic_args(args, colons_before_params) + } + } + } + + pub(crate) fn print_pat(&mut self, pat: &ast::Pat) { + self.maybe_print_comment(pat.span.lo()); + self.ann.pre(self, AnnNode::Pat(pat)); + /* Pat isn't normalized, but the beauty of it + is that it doesn't matter */ + match pat.kind { + PatKind::Wild => self.word("_"), + PatKind::Ident(binding_mode, ident, ref sub) => { + match binding_mode { + ast::BindingMode::ByRef(mutbl) => { + self.word_nbsp("ref"); + self.print_mutability(mutbl, false); + } + ast::BindingMode::ByValue(ast::Mutability::Not) => {} + ast::BindingMode::ByValue(ast::Mutability::Mut) => { + self.word_nbsp("mut"); + } + } + self.print_ident(ident); + if let Some(ref p) = *sub { + self.space(); + self.word_space("@"); + self.print_pat(p); + } + } + PatKind::TupleStruct(ref qself, ref path, ref elts) => { + if let Some(qself) = qself { + self.print_qpath(path, qself, true); + } else { + self.print_path(path, true, 0); + } + self.popen(); + self.commasep(Inconsistent, &elts, |s, p| s.print_pat(p)); + self.pclose(); + } + PatKind::Or(ref pats) => { + self.strsep("|", true, Inconsistent, &pats, |s, p| s.print_pat(p)); + } + 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 qself, ref path, ref fields, etc) => { + if let Some(qself) = qself { + self.print_qpath(path, qself, true); + } else { + self.print_path(path, true, 0); + } + self.nbsp(); + self.word("{"); + let empty = fields.is_empty() && !etc; + if !empty { + self.space(); + } + self.commasep_cmnt( + Consistent, + &fields, + |s, f| { + s.cbox(INDENT_UNIT); + if !f.is_shorthand { + s.print_ident(f.ident); + s.word_nbsp(":"); + } + s.print_pat(&f.pat); + s.end(); + }, + |f| f.pat.span, + ); + if etc { + if !fields.is_empty() { + self.word_space(","); + } + self.word(".."); + } + if !empty { + self.space(); + } + self.word("}"); + } + PatKind::Tuple(ref elts) => { + self.popen(); + self.commasep(Inconsistent, &elts, |s, p| s.print_pat(p)); + if elts.len() == 1 { + self.word(","); + } + self.pclose(); + } + PatKind::Box(ref inner) => { + self.word("box "); + self.print_pat(inner); + } + PatKind::Ref(ref inner, mutbl) => { + self.word("&"); + if mutbl == ast::Mutability::Mut { + self.word("mut "); + } + if let PatKind::Ident(ast::BindingMode::ByValue(ast::Mutability::Mut), ..) = + inner.kind + { + self.popen(); + self.print_pat(inner); + self.pclose(); + } else { + self.print_pat(inner); + } + } + PatKind::Lit(ref e) => self.print_expr(&**e), + PatKind::Range(ref begin, ref end, Spanned { node: ref end_kind, .. }) => { + if let Some(e) = begin { + self.print_expr(e); + } + match *end_kind { + RangeEnd::Included(RangeSyntax::DotDotDot) => self.word("..."), + RangeEnd::Included(RangeSyntax::DotDotEq) => self.word("..="), + RangeEnd::Excluded => self.word(".."), + } + if let Some(e) = end { + self.print_expr(e); + } + } + PatKind::Slice(ref elts) => { + self.word("["); + self.commasep(Inconsistent, &elts, |s, p| s.print_pat(p)); + self.word("]"); + } + PatKind::Rest => self.word(".."), + PatKind::Paren(ref inner) => { + self.popen(); + self.print_pat(inner); + self.pclose(); + } + PatKind::MacCall(ref m) => self.print_mac(m), + } + self.ann.post(self, AnnNode::Pat(pat)) + } + + fn print_explicit_self(&mut self, explicit_self: &ast::ExplicitSelf) { + match explicit_self.node { + SelfKind::Value(m) => { + self.print_mutability(m, false); + self.word("self") + } + SelfKind::Region(ref lt, m) => { + self.word("&"); + self.print_opt_lifetime(lt); + self.print_mutability(m, false); + self.word("self") + } + SelfKind::Explicit(ref typ, m) => { + self.print_mutability(m, false); + self.word("self"); + self.word_space(":"); + self.print_type(typ) + } + } + } + + pub(crate) fn print_asyncness(&mut self, asyncness: ast::Async) { + if asyncness.is_async() { + self.word_nbsp("async"); + } + } + + pub fn print_type_bounds(&mut self, bounds: &[ast::GenericBound]) { + let mut first = true; + for bound in bounds { + if first { + first = false; + } else { + self.nbsp(); + self.word_space("+"); + } + + match bound { + GenericBound::Trait(tref, modifier) => { + if modifier == &TraitBoundModifier::Maybe { + self.word("?"); + } + self.print_poly_trait_ref(tref); + } + GenericBound::Outlives(lt) => self.print_lifetime(*lt), + } + } + } + + pub(crate) fn print_lifetime(&mut self, lifetime: ast::Lifetime) { + self.print_name(lifetime.ident.name) + } + + pub(crate) fn print_lifetime_bounds(&mut self, bounds: &ast::GenericBounds) { + for (i, bound) in bounds.iter().enumerate() { + if i != 0 { + self.word(" + "); + } + match bound { + ast::GenericBound::Outlives(lt) => self.print_lifetime(*lt), + _ => panic!(), + } + } + } + + pub(crate) fn print_generic_params(&mut self, generic_params: &[ast::GenericParam]) { + if generic_params.is_empty() { + return; + } + + self.word("<"); + + self.commasep(Inconsistent, &generic_params, |s, param| { + s.print_outer_attributes_inline(¶m.attrs); + + match param.kind { + ast::GenericParamKind::Lifetime => { + let lt = ast::Lifetime { id: param.id, ident: param.ident }; + s.print_lifetime(lt); + if !param.bounds.is_empty() { + s.word_nbsp(":"); + s.print_lifetime_bounds(¶m.bounds) + } + } + ast::GenericParamKind::Type { ref default } => { + s.print_ident(param.ident); + if !param.bounds.is_empty() { + s.word_nbsp(":"); + s.print_type_bounds(¶m.bounds); + } + if let Some(ref default) = default { + s.space(); + s.word_space("="); + s.print_type(default) + } + } + ast::GenericParamKind::Const { ref ty, kw_span: _, ref default } => { + s.word_space("const"); + s.print_ident(param.ident); + s.space(); + s.word_space(":"); + s.print_type(ty); + if !param.bounds.is_empty() { + s.word_nbsp(":"); + s.print_type_bounds(¶m.bounds); + } + if let Some(ref default) = default { + s.space(); + s.word_space("="); + s.print_expr(&default.value); + } + } + } + }); + + self.word(">"); + } + + pub fn print_mutability(&mut self, mutbl: ast::Mutability, print_const: bool) { + match mutbl { + ast::Mutability::Mut => self.word_nbsp("mut"), + ast::Mutability::Not => { + if print_const { + self.word_nbsp("const"); + } + } + } + } + + pub(crate) fn print_mt(&mut self, mt: &ast::MutTy, print_const: bool) { + self.print_mutability(mt.mutbl, print_const); + self.print_type(&mt.ty) + } + + pub(crate) fn print_param(&mut self, input: &ast::Param, is_closure: bool) { + self.ibox(INDENT_UNIT); + + self.print_outer_attributes_inline(&input.attrs); + + match input.ty.kind { + 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.kind { + ident.name == kw::Empty + } else { + false + }; + if !invalid { + self.print_pat(&input.pat); + self.word(":"); + self.space(); + } + self.print_type(&input.ty); + } + } + } + self.end(); + } + + pub(crate) fn print_fn_ret_ty(&mut self, fn_ret_ty: &ast::FnRetTy) { + if let ast::FnRetTy::Ty(ty) = fn_ret_ty { + self.space_if_not_bol(); + self.ibox(INDENT_UNIT); + self.word_space("->"); + self.print_type(ty); + self.end(); + self.maybe_print_comment(ty.span.lo()); + } + } + + pub(crate) fn print_ty_fn( + &mut self, + ext: ast::Extern, + unsafety: ast::Unsafe, + decl: &ast::FnDecl, + name: Option<Ident>, + generic_params: &[ast::GenericParam], + ) { + self.ibox(INDENT_UNIT); + self.print_formal_generic_params(generic_params); + let generics = ast::Generics { + params: Vec::new(), + where_clause: ast::WhereClause { + has_where_token: false, + predicates: Vec::new(), + span: rustc_span::DUMMY_SP, + }, + span: rustc_span::DUMMY_SP, + }; + let header = ast::FnHeader { unsafety, ext, ..ast::FnHeader::default() }; + self.print_fn(decl, header, name, &generics); + self.end(); + } + + pub(crate) fn print_fn_header_info(&mut self, header: ast::FnHeader) { + self.print_constness(header.constness); + self.print_asyncness(header.asyncness); + self.print_unsafety(header.unsafety); + + match header.ext { + ast::Extern::None => {} + ast::Extern::Implicit(_) => { + self.word_nbsp("extern"); + } + ast::Extern::Explicit(abi, _) => { + self.word_nbsp("extern"); + self.print_literal(&abi.as_lit()); + self.nbsp(); + } + } + + self.word("fn") + } + + pub(crate) fn print_unsafety(&mut self, s: ast::Unsafe) { + match s { + ast::Unsafe::No => {} + ast::Unsafe::Yes(_) => self.word_nbsp("unsafe"), + } + } + + pub(crate) fn print_constness(&mut self, s: ast::Const) { + match s { + ast::Const::No => {} + ast::Const::Yes(_) => self.word_nbsp("const"), + } + } + + pub(crate) fn print_is_auto(&mut self, s: ast::IsAuto) { + match s { + ast::IsAuto::Yes => self.word_nbsp("auto"), + ast::IsAuto::No => {} + } + } +} |