| use rustc_target::spec::abi::Abi; |
| use syntax::ast; |
| use syntax::source_map::{SourceMap, Spanned}; |
| use syntax::parse::ParseSess; |
| use syntax::parse::lexer::comments; |
| use syntax::print::pp::{self, Breaks}; |
| use syntax::print::pp::Breaks::{Consistent, Inconsistent}; |
| use syntax::print::pprust::PrintState; |
| use syntax::ptr::P; |
| use syntax::symbol::keywords; |
| use syntax::util::parser::{self, AssocOp, Fixity}; |
| use syntax_pos::{self, BytePos, FileName}; |
| |
| use crate::hir; |
| use crate::hir::{PatKind, GenericBound, TraitBoundModifier, RangeEnd}; |
| use crate::hir::{GenericParam, GenericParamKind, GenericArg}; |
| |
| use std::borrow::Cow; |
| use std::cell::Cell; |
| use std::io::{self, Write, Read}; |
| use std::iter::Peekable; |
| use std::vec; |
| |
| pub enum AnnNode<'a> { |
| Name(&'a ast::Name), |
| Block(&'a hir::Block), |
| Item(&'a hir::Item), |
| SubItem(hir::HirId), |
| Expr(&'a hir::Expr), |
| Pat(&'a hir::Pat), |
| } |
| |
| pub enum Nested { |
| Item(hir::ItemId), |
| TraitItem(hir::TraitItemId), |
| ImplItem(hir::ImplItemId), |
| Body(hir::BodyId), |
| BodyArgPat(hir::BodyId, usize) |
| } |
| |
| pub trait PpAnn { |
| fn nested(&self, _state: &mut State<'_>, _nested: Nested) -> io::Result<()> { |
| Ok(()) |
| } |
| fn pre(&self, _state: &mut State<'_>, _node: AnnNode<'_>) -> io::Result<()> { |
| Ok(()) |
| } |
| fn post(&self, _state: &mut State<'_>, _node: AnnNode<'_>) -> io::Result<()> { |
| Ok(()) |
| } |
| fn try_fetch_item(&self, _: hir::HirId) -> Option<&hir::Item> { |
| None |
| } |
| } |
| |
| pub struct NoAnn; |
| impl PpAnn for NoAnn {} |
| pub const NO_ANN: &dyn PpAnn = &NoAnn; |
| |
| impl PpAnn for hir::Crate { |
| fn try_fetch_item(&self, item: hir::HirId) -> Option<&hir::Item> { |
| Some(self.item(item)) |
| } |
| fn nested(&self, state: &mut State<'_>, nested: Nested) -> io::Result<()> { |
| match nested { |
| Nested::Item(id) => state.print_item(self.item(id.id)), |
| Nested::TraitItem(id) => state.print_trait_item(self.trait_item(id)), |
| Nested::ImplItem(id) => state.print_impl_item(self.impl_item(id)), |
| Nested::Body(id) => state.print_expr(&self.body(id).value), |
| Nested::BodyArgPat(id, i) => state.print_pat(&self.body(id).arguments[i].pat) |
| } |
| } |
| } |
| |
| pub struct State<'a> { |
| pub s: pp::Printer<'a>, |
| cm: Option<&'a SourceMap>, |
| comments: Option<Vec<comments::Comment>>, |
| literals: Peekable<vec::IntoIter<comments::Literal>>, |
| cur_cmnt: usize, |
| boxes: Vec<pp::Breaks>, |
| ann: &'a (dyn PpAnn + 'a), |
| } |
| |
| impl<'a> PrintState<'a> for State<'a> { |
| fn writer(&mut self) -> &mut pp::Printer<'a> { |
| &mut self.s |
| } |
| |
| fn boxes(&mut self) -> &mut Vec<pp::Breaks> { |
| &mut self.boxes |
| } |
| |
| fn comments(&mut self) -> &mut Option<Vec<comments::Comment>> { |
| &mut self.comments |
| } |
| |
| fn cur_cmnt(&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() |
| } |
| } |
| |
| #[allow(non_upper_case_globals)] |
| pub const indent_unit: usize = 4; |
| |
| #[allow(non_upper_case_globals)] |
| pub const default_columns: usize = 78; |
| |
| |
| /// Requires you to pass an input filename and reader so that |
| /// it can scan the input text for comments and literals to |
| /// copy forward. |
| pub fn print_crate<'a>(cm: &'a SourceMap, |
| sess: &ParseSess, |
| krate: &hir::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); |
| |
| // When printing the AST, we sometimes need to inject `#[no_std]` here. |
| // Since you can't compile the HIR, it's not necessary. |
| |
| s.print_mod(&krate.module, &krate.attrs)?; |
| s.print_remaining_comments()?; |
| s.s.eof() |
| } |
| |
| impl<'a> State<'a> { |
| pub fn new_from_input(cm: &'a SourceMap, |
| 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 SourceMap, |
| 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>(ann: &dyn PpAnn, f: F) -> String |
| where F: FnOnce(&mut State<'_>) -> io::Result<()> |
| { |
| let mut wr = Vec::new(); |
| { |
| let mut printer = State { |
| s: pp::mk_printer(Box::new(&mut wr), default_columns), |
| cm: None, |
| comments: None, |
| literals: vec![].into_iter().peekable(), |
| cur_cmnt: 0, |
| boxes: Vec::new(), |
| ann, |
| }; |
| f(&mut printer).unwrap(); |
| printer.s.eof().unwrap(); |
| } |
| String::from_utf8(wr).unwrap() |
| } |
| |
| pub fn visibility_qualified<S: Into<Cow<'static, str>>>(vis: &hir::Visibility, w: S) -> String { |
| to_string(NO_ANN, |s| { |
| s.print_visibility(vis)?; |
| s.s.word(w) |
| }) |
| } |
| |
| 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 nbsp(&mut self) -> io::Result<()> { |
| self.s.word(" ") |
| } |
| |
| pub fn word_nbsp<S: Into<Cow<'static, str>>>(&mut self, w: S) -> io::Result<()> { |
| self.s.word(w)?; |
| self.nbsp() |
| } |
| |
| pub fn head<S: Into<Cow<'static, str>>>(&mut self, w: S) -> io::Result<()> { |
| let w = w.into(); |
| // 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 space_if_not_bol(&mut self) -> io::Result<()> { |
| if !self.is_bol() { |
| self.s.space()?; |
| } |
| Ok(()) |
| } |
| |
| 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: &[hir::Expr]) -> io::Result<()> { |
| self.commasep_cmnt(b, exprs, |s, e| s.print_expr(&e), |e| e.span) |
| } |
| |
| pub fn print_mod(&mut self, _mod: &hir::Mod, attrs: &[ast::Attribute]) -> io::Result<()> { |
| self.print_inner_attributes(attrs)?; |
| for &item_id in &_mod.item_ids { |
| self.ann.nested(self, Nested::Item(item_id))?; |
| } |
| Ok(()) |
| } |
| |
| pub fn print_foreign_mod(&mut self, |
| nmod: &hir::ForeignMod, |
| attrs: &[ast::Attribute]) |
| -> io::Result<()> { |
| self.print_inner_attributes(attrs)?; |
| for item in &nmod.items { |
| self.print_foreign_item(item)?; |
| } |
| Ok(()) |
| } |
| |
| pub fn print_opt_lifetime(&mut self, lifetime: &hir::Lifetime) -> io::Result<()> { |
| if !lifetime.is_elided() { |
| self.print_lifetime(lifetime)?; |
| self.nbsp()?; |
| } |
| Ok(()) |
| } |
| |
| pub fn print_type(&mut self, ty: &hir::Ty) -> io::Result<()> { |
| self.maybe_print_comment(ty.span.lo())?; |
| self.ibox(0)?; |
| match ty.node { |
| hir::TyKind::Slice(ref ty) => { |
| self.s.word("[")?; |
| self.print_type(&ty)?; |
| self.s.word("]")?; |
| } |
| hir::TyKind::Ptr(ref mt) => { |
| self.s.word("*")?; |
| match mt.mutbl { |
| hir::MutMutable => self.word_nbsp("mut")?, |
| hir::MutImmutable => self.word_nbsp("const")?, |
| } |
| self.print_type(&mt.ty)?; |
| } |
| hir::TyKind::Rptr(ref lifetime, ref mt) => { |
| self.s.word("&")?; |
| self.print_opt_lifetime(lifetime)?; |
| self.print_mt(mt)?; |
| } |
| hir::TyKind::Never => { |
| self.s.word("!")?; |
| }, |
| hir::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()?; |
| } |
| hir::TyKind::BareFn(ref f) => { |
| self.print_ty_fn(f.abi, f.unsafety, &f.decl, None, &f.generic_params, |
| &f.arg_names[..])?; |
| } |
| hir::TyKind::Def(..) => {}, |
| hir::TyKind::Path(ref qpath) => { |
| self.print_qpath(qpath, false)? |
| } |
| hir::TyKind::TraitObject(ref bounds, ref lifetime) => { |
| let mut first = true; |
| for bound in bounds { |
| if first { |
| first = false; |
| } else { |
| self.nbsp()?; |
| self.word_space("+")?; |
| } |
| self.print_poly_trait_ref(bound)?; |
| } |
| if !lifetime.is_elided() { |
| self.nbsp()?; |
| self.word_space("+")?; |
| self.print_lifetime(lifetime)?; |
| } |
| } |
| hir::TyKind::Array(ref ty, ref length) => { |
| self.s.word("[")?; |
| self.print_type(&ty)?; |
| self.s.word("; ")?; |
| self.print_anon_const(length)?; |
| self.s.word("]")?; |
| } |
| hir::TyKind::Typeof(ref e) => { |
| self.s.word("typeof(")?; |
| self.print_anon_const(e)?; |
| self.s.word(")")?; |
| } |
| hir::TyKind::Infer => { |
| self.s.word("_")?; |
| } |
| hir::TyKind::Err => { |
| self.popen()?; |
| self.s.word("/*ERROR*/")?; |
| self.pclose()?; |
| } |
| hir::TyKind::CVarArgs(_) => { |
| self.s.word("...")?; |
| } |
| } |
| self.end() |
| } |
| |
| pub fn print_foreign_item(&mut self, item: &hir::ForeignItem) -> io::Result<()> { |
| self.hardbreak_if_not_bol()?; |
| self.maybe_print_comment(item.span.lo())?; |
| self.print_outer_attributes(&item.attrs)?; |
| match item.node { |
| hir::ForeignItemKind::Fn(ref decl, ref arg_names, ref generics) => { |
| self.head("")?; |
| self.print_fn(decl, |
| hir::FnHeader { |
| unsafety: hir::Unsafety::Normal, |
| constness: hir::Constness::NotConst, |
| abi: Abi::Rust, |
| asyncness: hir::IsAsync::NotAsync, |
| }, |
| Some(item.ident.name), |
| generics, |
| &item.vis, |
| arg_names, |
| None)?; |
| self.end()?; // end head-ibox |
| self.s.word(";")?; |
| self.end() // end the outer fn box |
| } |
| hir::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 |
| } |
| hir::ForeignItemKind::Type => { |
| 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 |
| } |
| } |
| } |
| |
| fn print_associated_const(&mut self, |
| ident: ast::Ident, |
| ty: &hir::Ty, |
| default: Option<hir::BodyId>, |
| vis: &hir::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.ann.nested(self, Nested::Body(expr))?; |
| } |
| self.s.word(";") |
| } |
| |
| fn print_associated_type(&mut self, |
| ident: ast::Ident, |
| bounds: Option<&hir::GenericBounds>, |
| ty: Option<&hir::Ty>) |
| -> io::Result<()> { |
| self.word_space("type")?; |
| self.print_ident(ident)?; |
| if let Some(bounds) = bounds { |
| self.print_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: &hir::Item) -> io::Result<()> { |
| self.hardbreak_if_not_bol()?; |
| self.maybe_print_comment(item.span.lo())?; |
| self.print_outer_attributes(&item.attrs)?; |
| self.ann.pre(self, AnnNode::Item(item))?; |
| match item.node { |
| hir::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 |
| } |
| hir::ItemKind::Use(ref path, kind) => { |
| self.head(visibility_qualified(&item.vis, "use"))?; |
| self.print_path(path, false)?; |
| |
| match kind { |
| hir::UseKind::Single => { |
| if path.segments.last().unwrap().ident != item.ident { |
| self.s.space()?; |
| self.word_space("as")?; |
| self.print_ident(item.ident)?; |
| } |
| self.s.word(";")?; |
| } |
| hir::UseKind::Glob => self.s.word("::*;")?, |
| hir::UseKind::ListStem => self.s.word("::{};")? |
| } |
| self.end()?; // end inner head-block |
| self.end()?; // end outer head-block |
| } |
| hir::ItemKind::Static(ref ty, m, expr) => { |
| self.head(visibility_qualified(&item.vis, "static"))?; |
| if m == hir::MutMutable { |
| 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.ann.nested(self, Nested::Body(expr))?; |
| self.s.word(";")?; |
| self.end()?; // end the outer cbox |
| } |
| hir::ItemKind::Const(ref ty, 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.ann.nested(self, Nested::Body(expr))?; |
| self.s.word(";")?; |
| self.end()?; // end the outer cbox |
| } |
| hir::ItemKind::Fn(ref decl, header, ref param_names, body) => { |
| self.head("")?; |
| self.print_fn(decl, |
| header, |
| Some(item.ident.name), |
| param_names, |
| &item.vis, |
| &[], |
| Some(body))?; |
| self.s.word(" ")?; |
| self.end()?; // need to close a box |
| self.end()?; // need to close a box |
| self.ann.nested(self, Nested::Body(body))?; |
| } |
| hir::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)?; |
| } |
| hir::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)?; |
| } |
| hir::ItemKind::GlobalAsm(ref ga) => { |
| self.head(visibility_qualified(&item.vis, "global asm"))?; |
| self.s.word(ga.asm.as_str().get())?; |
| self.end()? |
| } |
| hir::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 |
| } |
| hir::ItemKind::Existential(ref exist) => { |
| self.head(visibility_qualified(&item.vis, "existential type"))?; |
| self.print_ident(item.ident)?; |
| self.print_generic_params(&exist.generics.params)?; |
| self.end()?; // end the inner ibox |
| |
| self.print_where_clause(&exist.generics.where_clause)?; |
| self.s.space()?; |
| self.word_space(":")?; |
| let mut real_bounds = Vec::with_capacity(exist.bounds.len()); |
| for b in exist.bounds.iter() { |
| if let GenericBound::Trait(ref ptr, hir::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_bounds(":", &real_bounds[..])?; |
| self.s.word(";")?; |
| self.end()?; // end the outer ibox |
| } |
| hir::ItemKind::Enum(ref enum_definition, ref params) => { |
| self.print_enum_def(enum_definition, params, item.ident.name, item.span, |
| &item.vis)?; |
| } |
| hir::ItemKind::Struct(ref struct_def, ref generics) => { |
| self.head(visibility_qualified(&item.vis, "struct"))?; |
| self.print_struct(struct_def, generics, item.ident.name, item.span, true)?; |
| } |
| hir::ItemKind::Union(ref struct_def, ref generics) => { |
| self.head(visibility_qualified(&item.vis, "union"))?; |
| self.print_struct(struct_def, generics, item.ident.name, item.span, true)?; |
| } |
| hir::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 let hir::ImplPolarity::Negative = polarity { |
| 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.ann.nested(self, Nested::ImplItem(impl_item.id))?; |
| } |
| self.bclose(item.span)?; |
| } |
| hir::ItemKind::Trait(is_auto, unsafety, ref generics, ref bounds, ref trait_items) => { |
| self.head("")?; |
| self.print_visibility(&item.vis)?; |
| self.print_is_auto(is_auto)?; |
| self.print_unsafety(unsafety)?; |
| 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, hir::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_bounds(":", &real_bounds[..])?; |
| self.print_where_clause(&generics.where_clause)?; |
| self.s.word(" ")?; |
| self.bopen()?; |
| for trait_item in trait_items { |
| self.ann.nested(self, Nested::TraitItem(trait_item.id))?; |
| } |
| self.bclose(item.span)?; |
| } |
| hir::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, hir::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_bounds("=", &real_bounds[..])?; |
| self.print_where_clause(&generics.where_clause)?; |
| self.s.word(";")?; |
| } |
| } |
| self.ann.post(self, AnnNode::Item(item)) |
| } |
| |
| pub fn print_trait_ref(&mut self, t: &hir::TraitRef) -> io::Result<()> { |
| self.print_path(&t.path, false) |
| } |
| |
| fn print_formal_generic_params( |
| &mut self, |
| generic_params: &[hir::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: &hir::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: &hir::EnumDef, |
| generics: &hir::Generics, |
| name: ast::Name, |
| span: syntax_pos::Span, |
| visibility: &hir::Visibility) |
| -> io::Result<()> { |
| self.head(visibility_qualified(visibility, "enum"))?; |
| self.print_name(name)?; |
| self.print_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: &[hir::Variant], |
| span: syntax_pos::Span) |
| -> io::Result<()> { |
| self.bopen()?; |
| for v in variants { |
| self.space_if_not_bol()?; |
| self.maybe_print_comment(v.span.lo())?; |
| self.print_outer_attributes(&v.node.attrs)?; |
| self.ibox(indent_unit)?; |
| self.print_variant(v)?; |
| self.s.word(",")?; |
| self.end()?; |
| self.maybe_print_trailing_comment(v.span, None)?; |
| } |
| self.bclose(span) |
| } |
| |
| pub fn print_visibility(&mut self, vis: &hir::Visibility) -> io::Result<()> { |
| match vis.node { |
| hir::VisibilityKind::Public => self.word_nbsp("pub")?, |
| hir::VisibilityKind::Crate(ast::CrateSugar::JustCrate) => self.word_nbsp("crate")?, |
| hir::VisibilityKind::Crate(ast::CrateSugar::PubCrate) => self.word_nbsp("pub(crate)")?, |
| hir::VisibilityKind::Restricted { ref path, .. } => { |
| self.s.word("pub(")?; |
| if path.segments.len() == 1 && |
| path.segments[0].ident.name == keywords::Super.name() { |
| // Special case: `super` can print like `pub(super)`. |
| self.s.word("super")?; |
| } else { |
| // Everything else requires `in` at present. |
| self.word_nbsp("in")?; |
| self.print_path(path, false)?; |
| } |
| self.word_nbsp(")")?; |
| } |
| hir::VisibilityKind::Inherited => () |
| } |
| |
| Ok(()) |
| } |
| |
| pub fn print_defaultness(&mut self, defaultness: hir::Defaultness) -> io::Result<()> { |
| match defaultness { |
| hir::Defaultness::Default { .. } => self.word_nbsp("default")?, |
| hir::Defaultness::Final => (), |
| } |
| Ok(()) |
| } |
| |
| pub fn print_struct(&mut self, |
| struct_def: &hir::VariantData, |
| generics: &hir::Generics, |
| name: ast::Name, |
| span: syntax_pos::Span, |
| print_finalizer: bool) |
| -> io::Result<()> { |
| self.print_name(name)?; |
| self.print_generic_params(&generics.params)?; |
| match struct_def { |
| hir::VariantData::Tuple(..) | hir::VariantData::Unit(..) => { |
| if let hir::VariantData::Tuple(..) = struct_def { |
| 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 |
| } |
| hir::VariantData::Struct(..) => { |
| 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)?; |
| self.word_nbsp(":")?; |
| self.print_type(&field.ty)?; |
| self.s.word(",")?; |
| } |
| |
| self.bclose(span) |
| } |
| } |
| } |
| |
| pub fn print_variant(&mut self, v: &hir::Variant) -> io::Result<()> { |
| self.head("")?; |
| let generics = hir::Generics::empty(); |
| self.print_struct(&v.node.data, &generics, v.node.ident.name, v.span, false)?; |
| if let Some(ref d) = v.node.disr_expr { |
| self.s.space()?; |
| self.word_space("=")?; |
| self.print_anon_const(d)?; |
| } |
| Ok(()) |
| } |
| pub fn print_method_sig(&mut self, |
| ident: ast::Ident, |
| m: &hir::MethodSig, |
| generics: &hir::Generics, |
| vis: &hir::Visibility, |
| arg_names: &[ast::Ident], |
| body_id: Option<hir::BodyId>) |
| -> io::Result<()> { |
| self.print_fn(&m.decl, |
| m.header, |
| Some(ident.name), |
| generics, |
| vis, |
| arg_names, |
| body_id) |
| } |
| |
| pub fn print_trait_item(&mut self, ti: &hir::TraitItem) -> io::Result<()> { |
| self.ann.pre(self, AnnNode::SubItem(ti.hir_id))?; |
| self.hardbreak_if_not_bol()?; |
| self.maybe_print_comment(ti.span.lo())?; |
| self.print_outer_attributes(&ti.attrs)?; |
| match ti.node { |
| hir::TraitItemKind::Const(ref ty, default) => { |
| let vis = Spanned { span: syntax_pos::DUMMY_SP, |
| node: hir::VisibilityKind::Inherited }; |
| self.print_associated_const(ti.ident, &ty, default, &vis)?; |
| } |
| hir::TraitItemKind::Method(ref sig, hir::TraitMethod::Required(ref arg_names)) => { |
| let vis = Spanned { span: syntax_pos::DUMMY_SP, |
| node: hir::VisibilityKind::Inherited }; |
| self.print_method_sig(ti.ident, sig, &ti.generics, &vis, arg_names, None)?; |
| self.s.word(";")?; |
| } |
| hir::TraitItemKind::Method(ref sig, hir::TraitMethod::Provided(body)) => { |
| let vis = Spanned { span: syntax_pos::DUMMY_SP, |
| node: hir::VisibilityKind::Inherited }; |
| self.head("")?; |
| self.print_method_sig(ti.ident, sig, &ti.generics, &vis, &[], Some(body))?; |
| self.nbsp()?; |
| self.end()?; // need to close a box |
| self.end()?; // need to close a box |
| self.ann.nested(self, Nested::Body(body))?; |
| } |
| hir::TraitItemKind::Type(ref bounds, ref default) => { |
| self.print_associated_type(ti.ident, |
| Some(bounds), |
| default.as_ref().map(|ty| &**ty))?; |
| } |
| } |
| self.ann.post(self, AnnNode::SubItem(ti.hir_id)) |
| } |
| |
| pub fn print_impl_item(&mut self, ii: &hir::ImplItem) -> io::Result<()> { |
| self.ann.pre(self, AnnNode::SubItem(ii.hir_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 { |
| hir::ImplItemKind::Const(ref ty, expr) => { |
| self.print_associated_const(ii.ident, &ty, Some(expr), &ii.vis)?; |
| } |
| hir::ImplItemKind::Method(ref sig, body) => { |
| self.head("")?; |
| self.print_method_sig(ii.ident, sig, &ii.generics, &ii.vis, &[], Some(body))?; |
| self.nbsp()?; |
| self.end()?; // need to close a box |
| self.end()?; // need to close a box |
| self.ann.nested(self, Nested::Body(body))?; |
| } |
| hir::ImplItemKind::Type(ref ty) => { |
| self.print_associated_type(ii.ident, None, Some(ty))?; |
| } |
| hir::ImplItemKind::Existential(ref bounds) => { |
| self.word_space("existential")?; |
| self.print_associated_type(ii.ident, Some(bounds), None)?; |
| } |
| } |
| self.ann.post(self, AnnNode::SubItem(ii.hir_id)) |
| } |
| |
| pub fn print_stmt(&mut self, st: &hir::Stmt) -> io::Result<()> { |
| self.maybe_print_comment(st.span.lo())?; |
| match st.node { |
| hir::StmtKind::Local(ref loc) => { |
| self.space_if_not_bol()?; |
| self.ibox(indent_unit)?; |
| self.word_nbsp("let")?; |
| |
| self.ibox(indent_unit)?; |
| self.print_local_decl(&loc)?; |
| self.end()?; |
| if let Some(ref init) = loc.init { |
| self.nbsp()?; |
| self.word_space("=")?; |
| self.print_expr(&init)?; |
| } |
| self.end()? |
| } |
| hir::StmtKind::Item(item) => { |
| self.ann.nested(self, Nested::Item(item))? |
| } |
| hir::StmtKind::Expr(ref expr) => { |
| self.space_if_not_bol()?; |
| self.print_expr(&expr)?; |
| } |
| hir::StmtKind::Semi(ref expr) => { |
| self.space_if_not_bol()?; |
| self.print_expr(&expr)?; |
| self.s.word(";")?; |
| } |
| } |
| if stmt_ends_with_semi(&st.node) { |
| self.s.word(";")?; |
| } |
| self.maybe_print_trailing_comment(st.span, None) |
| } |
| |
| pub fn print_block(&mut self, blk: &hir::Block) -> io::Result<()> { |
| self.print_block_with_attrs(blk, &[]) |
| } |
| |
| pub fn print_block_unclosed(&mut self, blk: &hir::Block) -> io::Result<()> { |
| self.print_block_unclosed_indent(blk, indent_unit) |
| } |
| |
| pub fn print_block_unclosed_indent(&mut self, |
| blk: &hir::Block, |
| indented: usize) |
| -> io::Result<()> { |
| self.print_block_maybe_unclosed(blk, indented, &[], false) |
| } |
| |
| pub fn print_block_with_attrs(&mut self, |
| blk: &hir::Block, |
| attrs: &[ast::Attribute]) |
| -> io::Result<()> { |
| self.print_block_maybe_unclosed(blk, indent_unit, attrs, true) |
| } |
| |
| pub fn print_block_maybe_unclosed(&mut self, |
| blk: &hir::Block, |
| indented: usize, |
| attrs: &[ast::Attribute], |
| close_box: bool) |
| -> io::Result<()> { |
| match blk.rules { |
| hir::UnsafeBlock(..) => self.word_space("unsafe")?, |
| hir::PushUnsafeBlock(..) => self.word_space("push_unsafe")?, |
| hir::PopUnsafeBlock(..) => self.word_space("pop_unsafe")?, |
| hir::DefaultBlock => (), |
| } |
| self.maybe_print_comment(blk.span.lo())?; |
| self.ann.pre(self, AnnNode::Block(blk))?; |
| self.bopen()?; |
| |
| self.print_inner_attributes(attrs)?; |
| |
| for st in &blk.stmts { |
| self.print_stmt(st)?; |
| } |
| if let Some(ref expr) = blk.expr { |
| self.space_if_not_bol()?; |
| self.print_expr(&expr)?; |
| self.maybe_print_trailing_comment(expr.span, Some(blk.span.hi()))?; |
| } |
| self.bclose_maybe_open(blk.span, indented, close_box)?; |
| self.ann.post(self, AnnNode::Block(blk)) |
| } |
| |
| fn print_else(&mut self, els: Option<&hir::Expr>) -> io::Result<()> { |
| match els { |
| Some(_else) => { |
| match _else.node { |
| // "another else-if" |
| hir::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_expr(&then)?; |
| self.print_else(e.as_ref().map(|e| &**e)) |
| } |
| // "final else" |
| hir::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: &hir::Expr, |
| blk: &hir::Expr, |
| elseopt: Option<&hir::Expr>) |
| -> io::Result<()> { |
| self.head("if")?; |
| self.print_expr_as_cond(test)?; |
| self.s.space()?; |
| self.print_expr(blk)?; |
| self.print_else(elseopt) |
| } |
| |
| pub fn print_if_let(&mut self, |
| pat: &hir::Pat, |
| expr: &hir::Expr, |
| blk: &hir::Block, |
| elseopt: Option<&hir::Expr>) |
| -> io::Result<()> { |
| self.head("if let")?; |
| self.print_pat(pat)?; |
| 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_anon_const(&mut self, constant: &hir::AnonConst) -> io::Result<()> { |
| self.ann.nested(self, Nested::Body(constant.body)) |
| } |
| |
| fn print_call_post(&mut self, args: &[hir::Expr]) -> io::Result<()> { |
| self.popen()?; |
| self.commasep_exprs(Inconsistent, args)?; |
| self.pclose() |
| } |
| |
| pub fn print_expr_maybe_paren(&mut self, expr: &hir::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: &hir::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) {}`. |
| hir::ExprKind::Closure(..) | |
| hir::ExprKind::Ret(..) | |
| hir::ExprKind::Break(..) => true, |
| |
| _ => 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: &[hir::Expr]) -> io::Result<()> { |
| self.ibox(indent_unit)?; |
| self.s.word("[")?; |
| self.commasep_exprs(Inconsistent, exprs)?; |
| self.s.word("]")?; |
| self.end() |
| } |
| |
| fn print_expr_repeat(&mut self, element: &hir::Expr, count: &hir::AnonConst) -> io::Result<()> { |
| self.ibox(indent_unit)?; |
| self.s.word("[")?; |
| self.print_expr(element)?; |
| self.word_space(";")?; |
| self.print_anon_const(count)?; |
| self.s.word("]")?; |
| self.end() |
| } |
| |
| fn print_expr_struct(&mut self, |
| qpath: &hir::QPath, |
| fields: &[hir::Field], |
| wth: &Option<P<hir::Expr>>) |
| -> io::Result<()> { |
| self.print_qpath(qpath, true)?; |
| self.s.word("{")?; |
| 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: &[hir::Expr]) -> io::Result<()> { |
| self.popen()?; |
| self.commasep_exprs(Inconsistent, exprs)?; |
| if exprs.len() == 1 { |
| self.s.word(",")?; |
| } |
| self.pclose() |
| } |
| |
| fn print_expr_call(&mut self, func: &hir::Expr, args: &[hir::Expr]) -> io::Result<()> { |
| let prec = |
| match func.node { |
| hir::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: &hir::PathSegment, |
| args: &[hir::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)?; |
| |
| segment.with_generic_args(|generic_args| { |
| if !generic_args.args.is_empty() || !generic_args.bindings.is_empty() { |
| return self.print_generic_args(&generic_args, segment.infer_types, true); |
| } |
| Ok(()) |
| })?; |
| self.print_call_post(base_args) |
| } |
| |
| fn print_expr_binary(&mut self, |
| op: hir::BinOp, |
| lhs: &hir::Expr, |
| rhs: &hir::Expr) |
| -> io::Result<()> { |
| let assoc_op = bin_op_to_assoc_op(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. |
| (&hir::ExprKind::Cast { .. }, hir::BinOpKind::Lt) | |
| (&hir::ExprKind::Cast { .. }, hir::BinOpKind::Shl) => parser::PREC_FORCE_PAREN, |
| _ => left_prec, |
| }; |
| |
| self.print_expr_maybe_paren(lhs, left_prec)?; |
| self.s.space()?; |
| self.word_space(op.node.as_str())?; |
| self.print_expr_maybe_paren(rhs, right_prec) |
| } |
| |
| fn print_expr_unary(&mut self, op: hir::UnOp, expr: &hir::Expr) -> io::Result<()> { |
| self.s.word(op.as_str())?; |
| self.print_expr_maybe_paren(expr, parser::PREC_PREFIX) |
| } |
| |
| fn print_expr_addr_of(&mut self, |
| mutability: hir::Mutability, |
| expr: &hir::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: &hir::Expr) -> io::Result<()> { |
| self.maybe_print_comment(expr.span.lo())?; |
| self.print_outer_attributes(&expr.attrs)?; |
| self.ibox(indent_unit)?; |
| self.ann.pre(self, AnnNode::Expr(expr))?; |
| match expr.node { |
| hir::ExprKind::Box(ref expr) => { |
| self.word_space("box")?; |
| self.print_expr_maybe_paren(expr, parser::PREC_PREFIX)?; |
| } |
| hir::ExprKind::Array(ref exprs) => { |
| self.print_expr_vec(exprs)?; |
| } |
| hir::ExprKind::Repeat(ref element, ref count) => { |
| self.print_expr_repeat(&element, count)?; |
| } |
| hir::ExprKind::Struct(ref qpath, ref fields, ref wth) => { |
| self.print_expr_struct(qpath, &fields[..], wth)?; |
| } |
| hir::ExprKind::Tup(ref exprs) => { |
| self.print_expr_tup(exprs)?; |
| } |
| hir::ExprKind::Call(ref func, ref args) => { |
| self.print_expr_call(&func, args)?; |
| } |
| hir::ExprKind::MethodCall(ref segment, _, ref args) => { |
| self.print_expr_method_call(segment, args)?; |
| } |
| hir::ExprKind::Binary(op, ref lhs, ref rhs) => { |
| self.print_expr_binary(op, &lhs, &rhs)?; |
| } |
| hir::ExprKind::Unary(op, ref expr) => { |
| self.print_expr_unary(op, &expr)?; |
| } |
| hir::ExprKind::AddrOf(m, ref expr) => { |
| self.print_expr_addr_of(m, &expr)?; |
| } |
| hir::ExprKind::Lit(ref lit) => { |
| self.print_literal(&lit)?; |
| } |
| hir::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)?; |
| } |
| hir::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)?; |
| } |
| hir::ExprKind::If(ref test, ref blk, ref elseopt) => { |
| self.print_if(&test, &blk, elseopt.as_ref().map(|e| &**e))?; |
| } |
| hir::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(&blk)?; |
| } |
| hir::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(&blk)?; |
| } |
| hir::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()?; |
| for arm in arms { |
| self.print_arm(arm)?; |
| } |
| self.bclose_(expr.span, indent_unit)?; |
| } |
| hir::ExprKind::Closure(capture_clause, ref decl, body, _fn_decl_span, _gen) => { |
| self.print_capture_clause(capture_clause)?; |
| |
| self.print_closure_args(&decl, body)?; |
| self.s.space()?; |
| |
| // this is a bare expression |
| self.ann.nested(self, Nested::Body(body))?; |
| self.end()?; // need to close a box |
| |
| // a box will be closed by print_expr, but we didn't want an overall |
| // wrapper so we closed the corresponding opening. so create an |
| // empty box to satisfy the close. |
| self.ibox(0)?; |
| } |
| hir::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(&blk)?; |
| } |
| hir::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)?; |
| } |
| hir::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.as_str())?; |
| self.word_space("=")?; |
| self.print_expr_maybe_paren(&rhs, prec)?; |
| } |
| hir::ExprKind::Field(ref expr, ident) => { |
| self.print_expr_maybe_paren(expr, parser::PREC_POSTFIX)?; |
| self.s.word(".")?; |
| self.print_ident(ident)?; |
| } |
| hir::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("]")?; |
| } |
| hir::ExprKind::Path(ref qpath) => { |
| self.print_qpath(qpath, true)? |
| } |
| hir::ExprKind::Break(destination, ref opt_expr) => { |
| self.s.word("break")?; |
| self.s.space()?; |
| if let Some(label) = destination.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()?; |
| } |
| } |
| hir::ExprKind::Continue(destination) => { |
| self.s.word("continue")?; |
| self.s.space()?; |
| if let Some(label) = destination.label { |
| self.print_ident(label.ident)?; |
| self.s.space()? |
| } |
| } |
| hir::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)?; |
| } |
| } |
| hir::ExprKind::InlineAsm(ref a, ref outputs, ref inputs) => { |
| self.s.word("asm!")?; |
| self.popen()?; |
| self.print_string(&a.asm.as_str(), a.asm_str_style)?; |
| self.word_space(":")?; |
| |
| let mut out_idx = 0; |
| 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(&outputs[out_idx])?; |
| s.pclose()?; |
| out_idx += 1; |
| Ok(()) |
| })?; |
| self.s.space()?; |
| self.word_space(":")?; |
| |
| let mut in_idx = 0; |
| self.commasep(Inconsistent, &a.inputs, |s, co| { |
| s.print_string(&co.as_str(), ast::StrStyle::Cooked)?; |
| s.popen()?; |
| s.print_expr(&inputs[in_idx])?; |
| s.pclose()?; |
| in_idx += 1; |
| 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()?; |
| } |
| hir::ExprKind::Yield(ref expr) => { |
| self.word_space("yield")?; |
| self.print_expr_maybe_paren(&expr, parser::PREC_JUMP)?; |
| } |
| hir::ExprKind::Err => { |
| self.popen()?; |
| self.s.word("/*ERROR*/")?; |
| self.pclose()?; |
| } |
| } |
| self.ann.post(self, AnnNode::Expr(expr))?; |
| self.end() |
| } |
| |
| pub fn print_local_decl(&mut self, loc: &hir::Local) -> io::Result<()> { |
| self.print_pat(&loc.pat)?; |
| if let Some(ref ty) = loc.ty { |
| self.word_space(":")?; |
| self.print_type(&ty)?; |
| } |
| Ok(()) |
| } |
| |
| pub fn print_usize(&mut self, i: usize) -> io::Result<()> { |
| self.s.word(i.to_string()) |
| } |
| |
| pub fn print_ident(&mut self, ident: ast::Ident) -> io::Result<()> { |
| if ident.is_raw_guess() { |
| self.s.word(format!("r#{}", ident.name))?; |
| } else { |
| self.s.word(ident.as_str().get())?; |
| } |
| self.ann.post(self, AnnNode::Name(&ident.name)) |
| } |
| |
| pub fn print_name(&mut self, name: ast::Name) -> io::Result<()> { |
| self.print_ident(ast::Ident::with_empty_ctxt(name)) |
| } |
| |
| pub fn print_for_decl(&mut self, loc: &hir::Local, coll: &hir::Expr) -> io::Result<()> { |
| self.print_local_decl(loc)?; |
| self.s.space()?; |
| self.word_space("in")?; |
| self.print_expr(coll) |
| } |
| |
| pub fn print_path(&mut self, |
| path: &hir::Path, |
| colons_before_params: bool) |
| -> io::Result<()> { |
| self.maybe_print_comment(path.span.lo())?; |
| |
| for (i, segment) in path.segments.iter().enumerate() { |
| if i > 0 { |
| self.s.word("::")? |
| } |
| if segment.ident.name != keywords::PathRoot.name() { |
| self.print_ident(segment.ident)?; |
| segment.with_generic_args(|generic_args| { |
| self.print_generic_args(generic_args, segment.infer_types, |
| colons_before_params) |
| })?; |
| } |
| } |
| |
| Ok(()) |
| } |
| |
| pub fn print_path_segment(&mut self, segment: &hir::PathSegment) -> io::Result<()> { |
| if segment.ident.name != keywords::PathRoot.name() { |
| self.print_ident(segment.ident)?; |
| segment.with_generic_args(|generic_args| { |
| self.print_generic_args(generic_args, segment.infer_types, false) |
| })?; |
| } |
| Ok(()) |
| } |
| |
| pub fn print_qpath(&mut self, |
| qpath: &hir::QPath, |
| colons_before_params: bool) |
| -> io::Result<()> { |
| match *qpath { |
| hir::QPath::Resolved(None, ref path) => { |
| self.print_path(path, colons_before_params) |
| } |
| hir::QPath::Resolved(Some(ref qself), ref path) => { |
| self.s.word("<")?; |
| self.print_type(qself)?; |
| self.s.space()?; |
| self.word_space("as")?; |
| |
| for (i, segment) in path.segments[..path.segments.len() - 1].iter().enumerate() { |
| if i > 0 { |
| self.s.word("::")? |
| } |
| if segment.ident.name != keywords::PathRoot.name() { |
| self.print_ident(segment.ident)?; |
| segment.with_generic_args(|generic_args| { |
| self.print_generic_args(generic_args, |
| segment.infer_types, |
| colons_before_params) |
| })?; |
| } |
| } |
| |
| self.s.word(">")?; |
| self.s.word("::")?; |
| let item_segment = path.segments.last().unwrap(); |
| self.print_ident(item_segment.ident)?; |
| item_segment.with_generic_args(|generic_args| { |
| self.print_generic_args(generic_args, |
| item_segment.infer_types, |
| colons_before_params) |
| }) |
| } |
| hir::QPath::TypeRelative(ref qself, ref item_segment) => { |
| self.s.word("<")?; |
| self.print_type(qself)?; |
| self.s.word(">")?; |
| self.s.word("::")?; |
| self.print_ident(item_segment.ident)?; |
| item_segment.with_generic_args(|generic_args| { |
| self.print_generic_args(generic_args, |
| item_segment.infer_types, |
| colons_before_params) |
| }) |
| } |
| } |
| } |
| |
| fn print_generic_args(&mut self, |
| generic_args: &hir::GenericArgs, |
| infer_types: bool, |
| colons_before_params: bool) |
| -> io::Result<()> { |
| if generic_args.parenthesized { |
| self.s.word("(")?; |
| self.commasep(Inconsistent, generic_args.inputs(), |s, ty| s.print_type(&ty))?; |
| self.s.word(")")?; |
| |
| self.space_if_not_bol()?; |
| self.word_space("->")?; |
| self.print_type(&generic_args.bindings[0].ty)?; |
| } else { |
| let start = if colons_before_params { "::<" } else { "<" }; |
| let empty = Cell::new(true); |
| let start_or_comma = |this: &mut Self| { |
| if empty.get() { |
| empty.set(false); |
| this.s.word(start) |
| } else { |
| this.word_space(",") |
| } |
| }; |
| |
| let mut nonelided_generic_args: bool = false; |
| let elide_lifetimes = generic_args.args.iter().all(|arg| match arg { |
| GenericArg::Lifetime(lt) => lt.is_elided(), |
| _ => { |
| nonelided_generic_args = true; |
| true |
| } |
| }); |
| |
| if nonelided_generic_args { |
| start_or_comma(self)?; |
| self.commasep(Inconsistent, &generic_args.args, |s, generic_arg| { |
| match generic_arg { |
| GenericArg::Lifetime(lt) if !elide_lifetimes => s.print_lifetime(lt), |
| GenericArg::Lifetime(_) => Ok(()), |
| GenericArg::Type(ty) => s.print_type(ty), |
| GenericArg::Const(ct) => s.print_anon_const(&ct.value), |
| } |
| })?; |
| } |
| |
| // FIXME(eddyb) This would leak into error messages, e.g.: |
| // "non-exhaustive patterns: `Some::<..>(_)` not covered". |
| if infer_types && false { |
| start_or_comma(self)?; |
| self.s.word("..")?; |
| } |
| |
| for binding in generic_args.bindings.iter() { |
| start_or_comma(self)?; |
| self.print_ident(binding.ident)?; |
| self.s.space()?; |
| self.word_space("=")?; |
| self.print_type(&binding.ty)?; |
| } |
| |
| if !empty.get() { |
| self.s.word(">")? |
| } |
| } |
| |
| Ok(()) |
| } |
| |
| pub fn print_pat(&mut self, pat: &hir::Pat) -> io::Result<()> { |
| 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.node { |
| PatKind::Wild => self.s.word("_")?, |
| PatKind::Binding(binding_mode, _, ident, ref sub) => { |
| match binding_mode { |
| hir::BindingAnnotation::Ref => { |
| self.word_nbsp("ref")?; |
| self.print_mutability(hir::MutImmutable)?; |
| } |
| hir::BindingAnnotation::RefMut => { |
| self.word_nbsp("ref")?; |
| self.print_mutability(hir::MutMutable)?; |
| } |
| hir::BindingAnnotation::Unannotated => {} |
| hir::BindingAnnotation::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 qpath, ref elts, ddpos) => { |
| self.print_qpath(qpath, true)?; |
| 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(ref qpath) => { |
| self.print_qpath(qpath, true)?; |
| } |
| PatKind::Struct(ref qpath, ref fields, etc) => { |
| self.print_qpath(qpath, true)?; |
| 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) => { |
| let is_range_inner = match inner.node { |
| PatKind::Range(..) => true, |
| _ => false, |
| }; |
| self.s.word("box ")?; |
| if is_range_inner { |
| self.popen()?; |
| } |
| self.print_pat(&inner)?; |
| if is_range_inner { |
| self.pclose()?; |
| } |
| } |
| PatKind::Ref(ref inner, mutbl) => { |
| let is_range_inner = match inner.node { |
| PatKind::Range(..) => true, |
| _ => false, |
| }; |
| self.s.word("&")?; |
| if mutbl == hir::MutMutable { |
| self.s.word("mut ")?; |
| } |
| if is_range_inner { |
| self.popen()?; |
| } |
| self.print_pat(&inner)?; |
| if is_range_inner { |
| self.pclose()?; |
| } |
| } |
| PatKind::Lit(ref e) => self.print_expr(&e)?, |
| PatKind::Range(ref begin, ref end, ref end_kind) => { |
| self.print_expr(&begin)?; |
| self.s.space()?; |
| match *end_kind { |
| RangeEnd::Included => 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("]")?; |
| } |
| } |
| self.ann.post(self, AnnNode::Pat(pat)) |
| } |
| |
| fn print_arm(&mut self, arm: &hir::Arm) -> io::Result<()> { |
| // I have no idea why this check is necessary, but here it |
| // is :( |
| if arm.attrs.is_empty() { |
| self.s.space()?; |
| } |
| self.cbox(indent_unit)?; |
| self.ibox(0)?; |
| self.print_outer_attributes(&arm.attrs)?; |
| let mut first = true; |
| for p in &arm.pats { |
| if first { |
| first = false; |
| } else { |
| self.s.space()?; |
| self.word_space("|")?; |
| } |
| self.print_pat(&p)?; |
| } |
| self.s.space()?; |
| if let Some(ref g) = arm.guard { |
| match g { |
| hir::Guard::If(e) => { |
| self.word_space("if")?; |
| self.print_expr(&e)?; |
| self.s.space()?; |
| } |
| } |
| } |
| self.word_space("=>")?; |
| |
| match arm.body.node { |
| hir::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 hir::UnsafeBlock(hir::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 |
| } |
| |
| pub fn print_fn(&mut self, |
| decl: &hir::FnDecl, |
| header: hir::FnHeader, |
| name: Option<ast::Name>, |
| generics: &hir::Generics, |
| vis: &hir::Visibility, |
| arg_names: &[ast::Ident], |
| body_id: Option<hir::BodyId>) |
| -> io::Result<()> { |
| self.print_fn_header_info(header, vis)?; |
| |
| if let Some(name) = name { |
| self.nbsp()?; |
| self.print_name(name)?; |
| } |
| self.print_generic_params(&generics.params)?; |
| |
| self.popen()?; |
| let mut i = 0; |
| // Make sure we aren't supplied *both* `arg_names` and `body_id`. |
| assert!(arg_names.is_empty() || body_id.is_none()); |
| self.commasep(Inconsistent, &decl.inputs, |s, ty| { |
| s.ibox(indent_unit)?; |
| if let Some(arg_name) = arg_names.get(i) { |
| s.s.word(arg_name.as_str().get())?; |
| s.s.word(":")?; |
| s.s.space()?; |
| } else if let Some(body_id) = body_id { |
| s.ann.nested(s, Nested::BodyArgPat(body_id, i))?; |
| s.s.word(":")?; |
| s.s.space()?; |
| } |
| i += 1; |
| s.print_type(ty)?; |
| s.end() |
| })?; |
| if decl.c_variadic { |
| self.s.word(", ...")?; |
| } |
| self.pclose()?; |
| |
| self.print_fn_output(decl)?; |
| self.print_where_clause(&generics.where_clause) |
| } |
| |
| fn print_closure_args(&mut self, decl: &hir::FnDecl, body_id: hir::BodyId) -> io::Result<()> { |
| self.s.word("|")?; |
| let mut i = 0; |
| self.commasep(Inconsistent, &decl.inputs, |s, ty| { |
| s.ibox(indent_unit)?; |
| |
| s.ann.nested(s, Nested::BodyArgPat(body_id, i))?; |
| i += 1; |
| |
| if let hir::TyKind::Infer = ty.node { |
| // Print nothing |
| } else { |
| s.s.word(":")?; |
| s.s.space()?; |
| s.print_type(ty)?; |
| } |
| s.end() |
| })?; |
| self.s.word("|")?; |
| |
| if let hir::DefaultReturn(..) = decl.output { |
| return Ok(()); |
| } |
| |
| self.space_if_not_bol()?; |
| self.word_space("->")?; |
| match decl.output { |
| hir::Return(ref ty) => { |
| self.print_type(&ty)?; |
| self.maybe_print_comment(ty.span.lo()) |
| } |
| hir::DefaultReturn(..) => unreachable!(), |
| } |
| } |
| |
| pub fn print_capture_clause(&mut self, capture_clause: hir::CaptureClause) -> io::Result<()> { |
| match capture_clause { |
| hir::CaptureByValue => self.word_space("move"), |
| hir::CaptureByRef => Ok(()), |
| } |
| } |
| |
| pub fn print_bounds(&mut self, prefix: &'static str, bounds: &[hir::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_generic_params(&mut self, generic_params: &[GenericParam]) -> io::Result<()> { |
| if !generic_params.is_empty() { |
| self.s.word("<")?; |
| |
| self.commasep(Inconsistent, generic_params, |s, param| { |
| s.print_generic_param(param) |
| })?; |
| |
| self.s.word(">")?; |
| } |
| Ok(()) |
| } |
| |
| pub fn print_generic_param(&mut self, param: &GenericParam) -> io::Result<()> { |
| if let GenericParamKind::Const { .. } = param.kind { |
| self.word_space("const")?; |
| } |
| |
| self.print_ident(param.name.ident())?; |
| |
| match param.kind { |
| GenericParamKind::Lifetime { .. } => { |
| let mut sep = ":"; |
| for bound in ¶m.bounds { |
| match bound { |
| GenericBound::Outlives(lt) => { |
| self.s.word(sep)?; |
| self.print_lifetime(lt)?; |
| sep = "+"; |
| } |
| _ => bug!(), |
| } |
| } |
| Ok(()) |
| } |
| GenericParamKind::Type { ref default, .. } => { |
| self.print_bounds(":", ¶m.bounds)?; |
| match default { |
| Some(default) => { |
| self.s.space()?; |
| self.word_space("=")?; |
| self.print_type(&default) |
| } |
| _ => Ok(()), |
| } |
| } |
| GenericParamKind::Const { ref ty } => { |
| self.word_space(":")?; |
| self.print_type(ty) |
| } |
| } |
| } |
| |
| pub fn print_lifetime(&mut self, lifetime: &hir::Lifetime) -> io::Result<()> { |
| self.print_ident(lifetime.name.ident()) |
| } |
| |
| pub fn print_where_clause(&mut self, where_clause: &hir::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 { |
| &hir::WherePredicate::BoundPredicate(hir::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_bounds(":", bounds)?; |
| } |
| &hir::WherePredicate::RegionPredicate(hir::WhereRegionPredicate{ref lifetime, |
| ref bounds, |
| ..}) => { |
| self.print_lifetime(lifetime)?; |
| self.s.word(":")?; |
| |
| for (i, bound) in bounds.iter().enumerate() { |
| match bound { |
| GenericBound::Outlives(lt) => { |
| self.print_lifetime(lt)?; |
| } |
| _ => bug!(), |
| } |
| |
| if i != 0 { |
| self.s.word(":")?; |
| } |
| } |
| } |
| &hir::WherePredicate::EqPredicate(hir::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_mutability(&mut self, mutbl: hir::Mutability) -> io::Result<()> { |
| match mutbl { |
| hir::MutMutable => self.word_nbsp("mut"), |
| hir::MutImmutable => Ok(()), |
| } |
| } |
| |
| pub fn print_mt(&mut self, mt: &hir::MutTy) -> io::Result<()> { |
| self.print_mutability(mt.mutbl)?; |
| self.print_type(&mt.ty) |
| } |
| |
| pub fn print_fn_output(&mut self, decl: &hir::FnDecl) -> io::Result<()> { |
| if let hir::DefaultReturn(..) = decl.output { |
| return Ok(()); |
| } |
| |
| self.space_if_not_bol()?; |
| self.ibox(indent_unit)?; |
| self.word_space("->")?; |
| match decl.output { |
| hir::DefaultReturn(..) => unreachable!(), |
| hir::Return(ref ty) => self.print_type(&ty)?, |
| } |
| self.end()?; |
| |
| match decl.output { |
| hir::Return(ref output) => self.maybe_print_comment(output.span.lo()), |
| _ => Ok(()), |
| } |
| } |
| |
| pub fn print_ty_fn(&mut self, |
| abi: Abi, |
| unsafety: hir::Unsafety, |
| decl: &hir::FnDecl, |
| name: Option<ast::Name>, |
| generic_params: &[hir::GenericParam], |
| arg_names: &[ast::Ident]) |
| -> io::Result<()> { |
| self.ibox(indent_unit)?; |
| if !generic_params.is_empty() { |
| self.s.word("for")?; |
| self.print_generic_params(generic_params)?; |
| } |
| let generics = hir::Generics { |
| params: hir::HirVec::new(), |
| where_clause: hir::WhereClause { |
| hir_id: hir::DUMMY_HIR_ID, |
| predicates: hir::HirVec::new(), |
| }, |
| span: syntax_pos::DUMMY_SP, |
| }; |
| self.print_fn(decl, |
| hir::FnHeader { |
| unsafety, |
| abi, |
| constness: hir::Constness::NotConst, |
| asyncness: hir::IsAsync::NotAsync, |
| }, |
| name, |
| &generics, |
| &Spanned { span: syntax_pos::DUMMY_SP, |
| node: hir::VisibilityKind::Inherited }, |
| arg_names, |
| None)?; |
| self.end() |
| } |
| |
| pub fn maybe_print_trailing_comment(&mut self, |
| span: syntax_pos::Span, |
| next_pos: Option<BytePos>) |
| -> io::Result<()> { |
| let cm = match self.cm { |
| Some(cm) => cm, |
| _ => return Ok(()), |
| }; |
| if let Some(ref cmnt) = self.next_comment() { |
| if (*cmnt).style != comments::Trailing { |
| return Ok(()); |
| } |
| let span_line = cm.lookup_char_pos(span.hi()); |
| let comment_line = cm.lookup_char_pos((*cmnt).pos); |
| let mut next = (*cmnt).pos + BytePos(1); |
| if let Some(p) = next_pos { |
| next = p; |
| } |
| if span.hi() < (*cmnt).pos && (*cmnt).pos < next && |
| span_line.line == comment_line.line { |
| self.print_comment(cmnt)?; |
| } |
| } |
| 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: hir::FnHeader, |
| vis: &hir::Visibility) |
| -> io::Result<()> { |
| self.s.word(visibility_qualified(vis, ""))?; |
| |
| match header.constness { |
| hir::Constness::NotConst => {} |
| hir::Constness::Const => self.word_nbsp("const")?, |
| } |
| |
| match header.asyncness { |
| hir::IsAsync::NotAsync => {} |
| hir::IsAsync::Async => self.word_nbsp("async")?, |
| } |
| |
| 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: hir::Unsafety) -> io::Result<()> { |
| match s { |
| hir::Unsafety::Normal => Ok(()), |
| hir::Unsafety::Unsafe => self.word_nbsp("unsafe"), |
| } |
| } |
| |
| pub fn print_is_auto(&mut self, s: hir::IsAuto) -> io::Result<()> { |
| match s { |
| hir::IsAuto::Yes => self.word_nbsp("auto"), |
| hir::IsAuto::No => Ok(()), |
| } |
| } |
| } |
| |
| // Dup'ed from parse::classify, but adapted for the HIR. |
| /// Does this expression require a semicolon to be treated |
| /// as a statement? The negation of this: 'can this expression |
| /// be used as a statement without a semicolon' -- is used |
| /// as an early-bail-out in the parser so that, for instance, |
| /// if true {...} else {...} |
| /// |x| 5 |
| /// isn't parsed as (if true {...} else {...} | x) | 5 |
| fn expr_requires_semi_to_be_stmt(e: &hir::Expr) -> bool { |
| match e.node { |
| hir::ExprKind::If(..) | |
| hir::ExprKind::Match(..) | |
| hir::ExprKind::Block(..) | |
| hir::ExprKind::While(..) | |
| hir::ExprKind::Loop(..) => false, |
| _ => true, |
| } |
| } |
| |
| /// this statement requires a semicolon after it. |
| /// note that in one case (stmt_semi), we've already |
| /// seen the semicolon, and thus don't need another. |
| fn stmt_ends_with_semi(stmt: &hir::StmtKind) -> bool { |
| match *stmt { |
| hir::StmtKind::Local(_) => true, |
| hir::StmtKind::Item(_) => false, |
| hir::StmtKind::Expr(ref e) => expr_requires_semi_to_be_stmt(&e), |
| hir::StmtKind::Semi(..) => false, |
| } |
| } |
| |
| fn bin_op_to_assoc_op(op: hir::BinOpKind) -> AssocOp { |
| use crate::hir::BinOpKind::*; |
| match op { |
| Add => AssocOp::Add, |
| Sub => AssocOp::Subtract, |
| Mul => AssocOp::Multiply, |
| Div => AssocOp::Divide, |
| Rem => AssocOp::Modulus, |
| |
| And => AssocOp::LAnd, |
| Or => AssocOp::LOr, |
| |
| BitXor => AssocOp::BitXor, |
| BitAnd => AssocOp::BitAnd, |
| BitOr => AssocOp::BitOr, |
| Shl => AssocOp::ShiftLeft, |
| Shr => AssocOp::ShiftRight, |
| |
| Eq => AssocOp::Equal, |
| Lt => AssocOp::Less, |
| Le => AssocOp::LessEqual, |
| Ne => AssocOp::NotEqual, |
| Ge => AssocOp::GreaterEqual, |
| Gt => AssocOp::Greater, |
| } |
| } |
| |
| /// Expressions that syntactically contain an "exterior" struct literal i.e., not surrounded by any |
| /// parens or other delimiters, e.g., `X { y: 1 }`, `X { y: 1 }.method()`, `foo == X { y: 1 }` and |
| /// `X { y: 1 } == foo` all do, but `(X { y: 1 }) == foo` does not. |
| fn contains_exterior_struct_lit(value: &hir::Expr) -> bool { |
| match value.node { |
| hir::ExprKind::Struct(..) => true, |
| |
| hir::ExprKind::Assign(ref lhs, ref rhs) | |
| hir::ExprKind::AssignOp(_, ref lhs, ref rhs) | |
| hir::ExprKind::Binary(_, ref lhs, ref rhs) => { |
| // X { y: 1 } + X { y: 2 } |
| contains_exterior_struct_lit(&lhs) || contains_exterior_struct_lit(&rhs) |
| } |
| hir::ExprKind::Unary(_, ref x) | |
| hir::ExprKind::Cast(ref x, _) | |
| hir::ExprKind::Type(ref x, _) | |
| hir::ExprKind::Field(ref x, _) | |
| hir::ExprKind::Index(ref x, _) => { |
| // &X { y: 1 }, X { y: 1 }.y |
| contains_exterior_struct_lit(&x) |
| } |
| |
| hir::ExprKind::MethodCall(.., ref exprs) => { |
| // X { y: 1 }.bar(...) |
| contains_exterior_struct_lit(&exprs[0]) |
| } |
| |
| _ => false, |
| } |
| } |
