+mod delimited;
+mod expr;
+mod item;
+
use crate::pp::Breaks::{Consistent, Inconsistent};
use crate::pp::{self, Breaks};
-use rustc_ast::attr;
use rustc_ast::ptr::P;
use rustc_ast::token::{self, BinOpToken, CommentKind, DelimToken, 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::{self, AssocOp, Fixity};
+use rustc_ast::util::parser;
use rustc_ast::{self as ast, BlockCheckMode, PatKind, RangeEnd, RangeSyntax};
-use rustc_ast::{GenericArg, MacArgs, ModKind};
+use rustc_ast::{attr, Term};
+use rustc_ast::{GenericArg, MacArgs};
use rustc_ast::{GenericBound, SelfKind, TraitBoundModifier};
use rustc_ast::{InlineAsmOperand, InlineAsmRegOrRegClass};
use rustc_ast::{InlineAsmOptions, InlineAsmTemplatePiece};
use std::borrow::Cow;
+pub use self::delimited::IterDelimited;
+
pub enum MacHeader<'a> {
Path(&'a ast::Path),
Keyword(&'static str),
ann: &'a (dyn PpAnn + 'a),
}
-crate const INDENT_UNIT: usize = 4;
+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.
edition: Edition,
) -> String {
let mut s =
- State { s: pp::mk_printer(), comments: Some(Comments::new(sm, filename, input)), ann };
+ 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
out
}
-fn visibility_qualified(vis: &ast::Visibility, s: &str) -> String {
- format!("{}{}", State::to_string(|s| s.print_visibility(vis)), s)
-}
-
impl std::ops::Deref for State<'_> {
type Target = pp::Printer;
fn deref(&self) -> &Self::Target {
self.word(cmnt.lines[0].clone());
self.hardbreak()
} else {
- self.ibox(0);
+ self.visual_align();
for line in &cmnt.lines {
if !line.is_empty() {
self.word(line.clone());
CommentStyle::BlankLine => {
// We need to do at least one, possibly two hardbreaks.
let twice = match self.last_token() {
- pp::Token::String(s) => ";" == s,
- pp::Token::Begin(_) => true,
- pp::Token::End => true,
+ Some(pp::Token::String(s)) => ";" == s,
+ Some(pp::Token::Begin(_)) => true,
+ Some(pp::Token::End) => true,
_ => false,
};
if twice {
&mut self,
macro_def: &ast::MacroDef,
ident: &Ident,
- sp: &Span,
+ sp: Span,
print_visibility: impl FnOnce(&mut Self),
) {
let (kw, has_bang) = if macro_def.macro_rules {
macro_def.body.delim(),
¯o_def.body.inner_tokens(),
true,
- *sp,
+ sp,
);
if macro_def.body.need_semicolon() {
self.word(";");
// Outer-box is consistent.
self.cbox(INDENT_UNIT);
// Head-box is inconsistent.
- self.ibox(w.len() + 1);
+ self.ibox(0);
// Keyword that starts the head.
if !w.is_empty() {
self.word_nbsp(w);
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 && self.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(pp::Printer::hardbreak_tok_offset(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));
+ }
+ }
}
}
impl<'a> State<'a> {
pub fn new() -> State<'a> {
- State { s: pp::mk_printer(), comments: None, ann: &NoAnn }
+ State { s: pp::Printer::new(), comments: None, ann: &NoAnn }
}
crate fn commasep_cmnt<T, F, G>(&mut self, b: Breaks, elts: &[T], mut op: F, mut get_span: G)
self.commasep_cmnt(b, exprs, |s, e| s.print_expr(e), |e| e.span)
}
- crate fn print_foreign_mod(&mut self, nmod: &ast::ForeignMod, attrs: &[ast::Attribute]) {
- self.print_inner_attributes(attrs);
- for item in &nmod.items {
- self.print_foreign_item(item);
- }
- }
-
pub fn print_opt_lifetime(&mut self, lifetime: &Option<ast::Lifetime>) {
if let Some(lt) = *lifetime {
self.print_lifetime(lt);
}
}
- pub fn print_assoc_constraint(&mut self, constraint: &ast::AssocTyConstraint) {
+ 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::AssocTyConstraintKind::Equality { ty } => {
+ ast::AssocConstraintKind::Equality { term } => {
self.word_space("=");
- self.print_type(ty);
- }
- ast::AssocTyConstraintKind::Bound { bounds } => {
- self.print_type_bounds(":", &*bounds);
+ match term {
+ Term::Ty(ty) => self.print_type(ty),
+ Term::Const(c) => self.print_expr_anon_const(c),
+ }
}
+ ast::AssocConstraintKind::Bound { bounds } => self.print_type_bounds(":", &*bounds),
}
}
self.end();
}
- crate fn print_foreign_item(&mut self, item: &ast::ForeignItem) {
- let ast::Item { id, span, ident, ref attrs, ref kind, ref vis, tokens: _ } = *item;
- self.ann.pre(self, AnnNode::SubItem(id));
- self.hardbreak_if_not_bol();
- self.maybe_print_comment(span.lo());
- self.print_outer_attributes(attrs);
- match kind {
- ast::ForeignItemKind::Fn(box ast::Fn { defaultness, sig, generics, body }) => {
- self.print_fn_full(sig, ident, generics, vis, *defaultness, body.as_deref(), attrs);
- }
- ast::ForeignItemKind::Static(ty, mutbl, body) => {
- let def = ast::Defaultness::Final;
- self.print_item_const(ident, Some(*mutbl), ty, body.as_deref(), vis, def);
- }
- ast::ForeignItemKind::TyAlias(box ast::TyAlias {
- defaultness,
- generics,
- bounds,
- ty,
- }) => {
- self.print_associated_type(
- ident,
- generics,
- bounds,
- ty.as_deref(),
- vis,
- *defaultness,
- );
- }
- ast::ForeignItemKind::MacCall(m) => {
- self.print_mac(m);
- if m.args.need_semicolon() {
- self.word(";");
- }
- }
- }
- self.ann.post(self, AnnNode::SubItem(id))
- }
-
- fn print_item_const(
- &mut self,
- ident: Ident,
- mutbl: Option<ast::Mutability>,
- ty: &ast::Ty,
- body: Option<&ast::Expr>,
- vis: &ast::Visibility,
- defaultness: ast::Defaultness,
- ) {
- self.head("");
- self.print_visibility(vis);
- self.print_defaultness(defaultness);
- let leading = match mutbl {
- None => "const",
- Some(ast::Mutability::Not) => "static",
- Some(ast::Mutability::Mut) => "static mut",
- };
- self.word_space(leading);
- self.print_ident(ident);
- self.word_space(":");
- self.print_type(ty);
- if body.is_some() {
- self.space();
- }
- self.end(); // end the head-ibox
- if let Some(body) = body {
- self.word_space("=");
- self.print_expr(body);
- }
- self.word(";");
- self.end(); // end the outer cbox
- }
-
- fn print_associated_type(
- &mut self,
- ident: Ident,
- generics: &ast::Generics,
- bounds: &ast::GenericBounds,
- ty: Option<&ast::Ty>,
- vis: &ast::Visibility,
- defaultness: ast::Defaultness,
- ) {
- self.head("");
- self.print_visibility(vis);
- self.print_defaultness(defaultness);
- self.word_space("type");
- self.print_ident(ident);
- self.print_generic_params(&generics.params);
- self.print_type_bounds(":", bounds);
- self.print_where_clause(&generics.where_clause);
- if let Some(ty) = ty {
- self.space();
- self.word_space("=");
- self.print_type(ty);
- }
- self.word(";");
- self.end(); // end inner head-block
- self.end(); // end outer head-block
- }
-
- /// Pretty-prints an item.
- crate fn print_item(&mut self, item: &ast::Item) {
- 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.kind {
- ast::ItemKind::ExternCrate(orig_name) => {
- self.head(visibility_qualified(&item.vis, "extern crate"));
- if let Some(orig_name) = orig_name {
- self.print_name(orig_name);
- self.space();
- self.word("as");
- self.space();
- }
- self.print_ident(item.ident);
- self.word(";");
- self.end(); // end inner head-block
- self.end(); // end outer head-block
- }
- ast::ItemKind::Use(ref tree) => {
- self.head(visibility_qualified(&item.vis, "use"));
- self.print_use_tree(tree);
- self.word(";");
- self.end(); // end inner head-block
- self.end(); // end outer head-block
- }
- ast::ItemKind::Static(ref ty, mutbl, ref body) => {
- let def = ast::Defaultness::Final;
- self.print_item_const(item.ident, Some(mutbl), ty, body.as_deref(), &item.vis, def);
- }
- ast::ItemKind::Const(def, ref ty, ref body) => {
- self.print_item_const(item.ident, None, ty, body.as_deref(), &item.vis, def);
- }
- ast::ItemKind::Fn(box ast::Fn { defaultness, ref sig, ref generics, ref body }) => {
- let body = body.as_deref();
- self.print_fn_full(
- sig,
- item.ident,
- generics,
- &item.vis,
- defaultness,
- body,
- &item.attrs,
- );
- }
- ast::ItemKind::Mod(unsafety, ref mod_kind) => {
- self.head(Self::to_string(|s| {
- s.print_visibility(&item.vis);
- s.print_unsafety(unsafety);
- s.word("mod");
- }));
- self.print_ident(item.ident);
-
- match mod_kind {
- ModKind::Loaded(items, ..) => {
- self.nbsp();
- self.bopen();
- self.print_inner_attributes(&item.attrs);
- for item in items {
- self.print_item(item);
- }
- let empty = item.attrs.is_empty() && items.is_empty();
- self.bclose(item.span, empty);
- }
- ModKind::Unloaded => {
- self.word(";");
- self.end(); // end inner head-block
- self.end(); // end outer head-block
- }
- }
- }
- ast::ItemKind::ForeignMod(ref nmod) => {
- self.head(Self::to_string(|s| {
- s.print_unsafety(nmod.unsafety);
- s.word("extern");
- }));
- if let Some(abi) = nmod.abi {
- self.print_literal(&abi.as_lit());
- self.nbsp();
- }
- self.bopen();
- self.print_foreign_mod(nmod, &item.attrs);
- let empty = item.attrs.is_empty() && nmod.items.is_empty();
- self.bclose(item.span, empty);
- }
- ast::ItemKind::GlobalAsm(ref asm) => {
- self.head(visibility_qualified(&item.vis, "global_asm!"));
- self.print_inline_asm(asm);
- self.end();
- }
- ast::ItemKind::TyAlias(box ast::TyAlias {
- defaultness,
- ref generics,
- ref bounds,
- ref ty,
- }) => {
- let ty = ty.as_deref();
- self.print_associated_type(
- item.ident,
- generics,
- bounds,
- ty,
- &item.vis,
- defaultness,
- );
- }
- ast::ItemKind::Enum(ref enum_definition, ref params) => {
- self.print_enum_def(enum_definition, params, item.ident, item.span, &item.vis);
- }
- ast::ItemKind::Struct(ref struct_def, ref generics) => {
- self.head(visibility_qualified(&item.vis, "struct"));
- self.print_struct(struct_def, generics, item.ident, item.span, true);
- }
- ast::ItemKind::Union(ref struct_def, ref generics) => {
- self.head(visibility_qualified(&item.vis, "union"));
- self.print_struct(struct_def, generics, item.ident, item.span, true);
- }
- ast::ItemKind::Impl(box ast::Impl {
- unsafety,
- polarity,
- defaultness,
- constness,
- ref generics,
- ref of_trait,
- ref self_ty,
- ref items,
- }) => {
- self.head("");
- self.print_visibility(&item.vis);
- self.print_defaultness(defaultness);
- self.print_unsafety(unsafety);
- self.word("impl");
-
- if generics.params.is_empty() {
- self.nbsp();
- } else {
- self.print_generic_params(&generics.params);
- self.space();
- }
-
- self.print_constness(constness);
-
- if let ast::ImplPolarity::Negative(_) = polarity {
- self.word("!");
- }
-
- if let Some(ref t) = *of_trait {
- self.print_trait_ref(t);
- self.space();
- self.word_space("for");
- }
-
- self.print_type(self_ty);
- self.print_where_clause(&generics.where_clause);
-
- self.space();
- self.bopen();
- self.print_inner_attributes(&item.attrs);
- for impl_item in items {
- self.print_assoc_item(impl_item);
- }
- let empty = item.attrs.is_empty() && items.is_empty();
- self.bclose(item.span, empty);
- }
- ast::ItemKind::Trait(box ast::Trait {
- is_auto,
- unsafety,
- ref generics,
- ref bounds,
- ref items,
- ..
- }) => {
- self.head("");
- self.print_visibility(&item.vis);
- self.print_unsafety(unsafety);
- self.print_is_auto(is_auto);
- self.word_nbsp("trait");
- self.print_ident(item.ident);
- self.print_generic_params(&generics.params);
- let mut real_bounds = Vec::with_capacity(bounds.len());
- for b in bounds.iter() {
- if let GenericBound::Trait(ref ptr, ast::TraitBoundModifier::Maybe) = *b {
- self.space();
- self.word_space("for ?");
- self.print_trait_ref(&ptr.trait_ref);
- } else {
- real_bounds.push(b.clone());
- }
- }
- self.print_type_bounds(":", &real_bounds);
- self.print_where_clause(&generics.where_clause);
- self.word(" ");
- self.bopen();
- self.print_inner_attributes(&item.attrs);
- for trait_item in items {
- self.print_assoc_item(trait_item);
- }
- let empty = item.attrs.is_empty() && items.is_empty();
- self.bclose(item.span, empty);
- }
- ast::ItemKind::TraitAlias(ref generics, ref bounds) => {
- self.head("");
- self.print_visibility(&item.vis);
- self.word_nbsp("trait");
- self.print_ident(item.ident);
- self.print_generic_params(&generics.params);
- let mut real_bounds = Vec::with_capacity(bounds.len());
- // FIXME(durka) this seems to be some quite outdated syntax
- for b in bounds.iter() {
- if let GenericBound::Trait(ref ptr, ast::TraitBoundModifier::Maybe) = *b {
- self.space();
- self.word_space("for ?");
- self.print_trait_ref(&ptr.trait_ref);
- } else {
- real_bounds.push(b.clone());
- }
- }
- self.nbsp();
- self.print_type_bounds("=", &real_bounds);
- self.print_where_clause(&generics.where_clause);
- self.word(";");
- }
- ast::ItemKind::MacCall(ref mac) => {
- self.print_mac(mac);
- if mac.args.need_semicolon() {
- self.word(";");
- }
- }
- ast::ItemKind::MacroDef(ref macro_def) => {
- self.print_mac_def(macro_def, &item.ident, &item.span, |state| {
- state.print_visibility(&item.vis)
- });
- }
- }
- self.ann.post(self, AnnNode::Item(item))
- }
-
fn print_trait_ref(&mut self, t: &ast::TraitRef) {
self.print_path(&t.path, false, 0)
}
self.print_trait_ref(&t.trait_ref)
}
- crate fn print_enum_def(
- &mut self,
- enum_definition: &ast::EnumDef,
- generics: &ast::Generics,
- ident: Ident,
- span: rustc_span::Span,
- visibility: &ast::Visibility,
- ) {
- self.head(visibility_qualified(visibility, "enum"));
- self.print_ident(ident);
- self.print_generic_params(&generics.params);
- self.print_where_clause(&generics.where_clause);
- self.space();
- self.print_variants(&enum_definition.variants, span)
- }
-
- crate fn print_variants(&mut self, variants: &[ast::Variant], span: rustc_span::Span) {
- self.bopen();
- for v in variants {
- self.space_if_not_bol();
- self.maybe_print_comment(v.span.lo());
- self.print_outer_attributes(&v.attrs);
- self.ibox(INDENT_UNIT);
- self.print_variant(v);
- self.word(",");
- self.end();
- self.maybe_print_trailing_comment(v.span, None);
- }
- let empty = variants.is_empty();
- self.bclose(span, empty)
- }
-
- crate fn print_visibility(&mut self, vis: &ast::Visibility) {
- match vis.kind {
- ast::VisibilityKind::Public => self.word_nbsp("pub"),
- ast::VisibilityKind::Crate(sugar) => match sugar {
- ast::CrateSugar::PubCrate => self.word_nbsp("pub(crate)"),
- ast::CrateSugar::JustCrate => self.word_nbsp("crate"),
- },
- ast::VisibilityKind::Restricted { ref path, .. } => {
- let path = Self::to_string(|s| s.print_path(path, false, 0));
- if path == "self" || path == "super" {
- self.word_nbsp(format!("pub({})", path))
- } else {
- self.word_nbsp(format!("pub(in {})", path))
- }
- }
- ast::VisibilityKind::Inherited => {}
- }
- }
-
- crate fn print_defaultness(&mut self, defaultness: ast::Defaultness) {
- if let ast::Defaultness::Default(_) = defaultness {
- self.word_nbsp("default");
- }
- }
-
- crate fn print_record_struct_body(&mut self, fields: &[ast::FieldDef], span: rustc_span::Span) {
- self.nbsp();
- self.bopen();
-
- let empty = fields.is_empty();
- if !empty {
- self.hardbreak_if_not_bol();
-
- for field in fields {
- self.hardbreak_if_not_bol();
- self.maybe_print_comment(field.span.lo());
- self.print_outer_attributes(&field.attrs);
- self.print_visibility(&field.vis);
- self.print_ident(field.ident.unwrap());
- self.word_nbsp(":");
- self.print_type(&field.ty);
- self.word(",");
- }
- }
-
- self.bclose(span, empty);
- }
-
- crate fn print_struct(
- &mut self,
- struct_def: &ast::VariantData,
- generics: &ast::Generics,
- ident: Ident,
- span: rustc_span::Span,
- print_finalizer: bool,
- ) {
- self.print_ident(ident);
- self.print_generic_params(&generics.params);
- match struct_def {
- ast::VariantData::Tuple(..) | ast::VariantData::Unit(..) => {
- if let ast::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.word(";");
- }
- self.end();
- self.end(); // Close the outer-box.
- }
- ast::VariantData::Struct(ref fields, ..) => {
- self.print_where_clause(&generics.where_clause);
- self.print_record_struct_body(fields, span);
- }
- }
- }
-
- crate fn print_variant(&mut self, v: &ast::Variant) {
- self.head("");
- self.print_visibility(&v.vis);
- let generics = ast::Generics::default();
- self.print_struct(&v.data, &generics, v.ident, v.span, false);
- if let Some(ref d) = v.disr_expr {
- self.space();
- self.word_space("=");
- self.print_expr(&d.value)
- }
- }
-
- crate fn print_assoc_item(&mut self, item: &ast::AssocItem) {
- let ast::Item { id, span, ident, ref attrs, ref kind, ref vis, tokens: _ } = *item;
- self.ann.pre(self, AnnNode::SubItem(id));
- self.hardbreak_if_not_bol();
- self.maybe_print_comment(span.lo());
- self.print_outer_attributes(attrs);
- match kind {
- ast::AssocItemKind::Fn(box ast::Fn { defaultness, sig, generics, body }) => {
- self.print_fn_full(sig, ident, generics, vis, *defaultness, body.as_deref(), attrs);
- }
- ast::AssocItemKind::Const(def, ty, body) => {
- self.print_item_const(ident, None, ty, body.as_deref(), vis, *def);
- }
- ast::AssocItemKind::TyAlias(box ast::TyAlias { defaultness, generics, bounds, ty }) => {
- self.print_associated_type(
- ident,
- generics,
- bounds,
- ty.as_deref(),
- vis,
- *defaultness,
- );
- }
- ast::AssocItemKind::MacCall(m) => {
- self.print_mac(m);
- if m.args.need_semicolon() {
- self.word(";");
- }
- }
- }
- self.ann.post(self, AnnNode::SubItem(id))
- }
-
crate fn print_stmt(&mut self, st: &ast::Stmt) {
self.maybe_print_comment(st.span.lo());
match st.kind {
self.print_expr_cond_paren(expr, Self::cond_needs_par(expr) || npals())
}
- fn print_else(&mut self, els: Option<&ast::Expr>) {
- if let Some(_else) = els {
- match _else.kind {
- // Another `else if` block.
- ast::ExprKind::If(ref i, ref then, ref e) => {
- self.cbox(INDENT_UNIT - 1);
- self.ibox(0);
- self.word(" else if ");
- self.print_expr_as_cond(i);
- self.space();
- self.print_block(then);
- self.print_else(e.as_deref())
- }
- // Final `else` block.
- ast::ExprKind::Block(ref b, _) => {
- self.cbox(INDENT_UNIT - 1);
- self.ibox(0);
- self.word(" else ");
- self.print_block(b)
- }
- // Constraints would be great here!
- _ => {
- panic!("print_if saw if with weird alternative");
- }
- }
- }
- }
-
- crate fn print_if(&mut self, test: &ast::Expr, blk: &ast::Block, elseopt: Option<&ast::Expr>) {
- self.head("if");
- self.print_expr_as_cond(test);
- self.space();
- self.print_block(blk);
- self.print_else(elseopt)
- }
-
crate fn print_mac(&mut self, m: &ast::MacCall) {
self.print_mac_common(
Some(MacHeader::Path(&m.path)),
);
}
- fn print_call_post(&mut self, args: &[P<ast::Expr>]) {
- self.popen();
- self.commasep_exprs(Inconsistent, args);
- self.pclose()
- }
-
- crate fn print_expr_maybe_paren(&mut self, expr: &ast::Expr, prec: i8) {
- self.print_expr_cond_paren(expr, expr.precedence().order() < prec)
- }
-
- /// Prints an expr using syntax that's acceptable in a condition position, such as the `cond` in
- /// `if cond { ... }`.
- crate fn print_expr_as_cond(&mut self, expr: &ast::Expr) {
- self.print_expr_cond_paren(expr, Self::cond_needs_par(expr))
- }
-
- // Does `expr` need parentheses when printed in a condition position?
- //
- // These cases need parens due to the parse error observed in #26461: `if return {}`
- // parses as the erroneous construct `if (return {})`, not `if (return) {}`.
- fn cond_needs_par(expr: &ast::Expr) -> bool {
- match expr.kind {
- ast::ExprKind::Break(..) | ast::ExprKind::Closure(..) | ast::ExprKind::Ret(..) => true,
- _ => parser::contains_exterior_struct_lit(expr),
- }
- }
-
- /// Prints `expr` or `(expr)` when `needs_par` holds.
- fn print_expr_cond_paren(&mut self, expr: &ast::Expr, needs_par: bool) {
- if needs_par {
- self.popen();
- }
- self.print_expr(expr);
- if needs_par {
- self.pclose();
- }
- }
-
- fn print_expr_vec(&mut self, exprs: &[P<ast::Expr>]) {
- self.ibox(INDENT_UNIT);
- self.word("[");
- self.commasep_exprs(Inconsistent, exprs);
- self.word("]");
- self.end();
- }
-
- fn print_expr_anon_const(&mut self, expr: &ast::AnonConst) {
- self.ibox(INDENT_UNIT);
- self.word("const");
- self.print_expr(&expr.value);
- self.end();
- }
-
- fn print_expr_repeat(&mut self, element: &ast::Expr, count: &ast::AnonConst) {
- self.ibox(INDENT_UNIT);
- self.word("[");
- self.print_expr(element);
- self.word_space(";");
- self.print_expr(&count.value);
- self.word("]");
- self.end();
- }
-
- fn print_expr_struct(
- &mut self,
- qself: &Option<ast::QSelf>,
- path: &ast::Path,
- fields: &[ast::ExprField],
- rest: &ast::StructRest,
- ) {
- if let Some(qself) = qself {
- self.print_qpath(path, qself, true);
- } else {
- self.print_path(path, true, 0);
- }
- self.word("{");
- self.commasep_cmnt(
- Consistent,
- fields,
- |s, field| {
- s.print_outer_attributes(&field.attrs);
- 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 rest {
- ast::StructRest::Base(_) | ast::StructRest::Rest(_) => {
- self.ibox(INDENT_UNIT);
- if !fields.is_empty() {
- self.word(",");
- self.space();
- }
- self.word("..");
- if let ast::StructRest::Base(ref expr) = *rest {
- self.print_expr(expr);
- }
- self.end();
- }
- ast::StructRest::None if !fields.is_empty() => self.word(","),
- _ => {}
- }
- self.word("}");
- }
-
- fn print_expr_tup(&mut self, exprs: &[P<ast::Expr>]) {
- self.popen();
- self.commasep_exprs(Inconsistent, exprs);
- if exprs.len() == 1 {
- self.word(",");
- }
- self.pclose()
- }
-
- fn print_expr_call(&mut self, func: &ast::Expr, args: &[P<ast::Expr>]) {
- let prec = match func.kind {
- ast::ExprKind::Field(..) => parser::PREC_FORCE_PAREN,
- _ => parser::PREC_POSTFIX,
- };
-
- self.print_expr_maybe_paren(func, prec);
- self.print_call_post(args)
- }
-
- fn print_expr_method_call(&mut self, segment: &ast::PathSegment, args: &[P<ast::Expr>]) {
- let base_args = &args[1..];
- self.print_expr_maybe_paren(&args[0], parser::PREC_POSTFIX);
- self.word(".");
- self.print_ident(segment.ident);
- if let Some(ref args) = segment.args {
- self.print_generic_args(args, true);
- }
- self.print_call_post(base_args)
- }
-
- fn print_expr_binary(&mut self, op: ast::BinOp, lhs: &ast::Expr, rhs: &ast::Expr) {
- let assoc_op = AssocOp::from_ast_binop(op.node);
- let prec = assoc_op.precedence() as i8;
- let fixity = assoc_op.fixity();
-
- let (left_prec, right_prec) = match fixity {
- Fixity::Left => (prec, prec + 1),
- Fixity::Right => (prec + 1, prec),
- Fixity::None => (prec + 1, prec + 1),
- };
-
- let left_prec = match (&lhs.kind, op.node) {
- // These cases need parens: `x as i32 < y` has the parser thinking that `i32 < y` is
- // the beginning of a path type. It starts trying to parse `x as (i32 < y ...` instead
- // of `(x as i32) < ...`. We need to convince it _not_ to do that.
- (&ast::ExprKind::Cast { .. }, ast::BinOpKind::Lt | ast::BinOpKind::Shl) => {
- parser::PREC_FORCE_PAREN
- }
- // We are given `(let _ = a) OP b`.
- //
- // - When `OP <= LAnd` we should print `let _ = a OP b` to avoid redundant parens
- // as the parser will interpret this as `(let _ = a) OP b`.
- //
- // - Otherwise, e.g. when we have `(let a = b) < c` in AST,
- // parens are required since the parser would interpret `let a = b < c` as
- // `let a = (b < c)`. To achieve this, we force parens.
- (&ast::ExprKind::Let { .. }, _) if !parser::needs_par_as_let_scrutinee(prec) => {
- parser::PREC_FORCE_PAREN
- }
- _ => left_prec,
- };
-
- self.print_expr_maybe_paren(lhs, left_prec);
- self.space();
- self.word_space(op.node.to_string());
- self.print_expr_maybe_paren(rhs, right_prec)
- }
-
- fn print_expr_unary(&mut self, op: ast::UnOp, expr: &ast::Expr) {
- self.word(ast::UnOp::to_string(op));
- self.print_expr_maybe_paren(expr, parser::PREC_PREFIX)
- }
-
- fn print_expr_addr_of(
- &mut self,
- kind: ast::BorrowKind,
- mutability: ast::Mutability,
- expr: &ast::Expr,
- ) {
- self.word("&");
- match kind {
- ast::BorrowKind::Ref => self.print_mutability(mutability, false),
- ast::BorrowKind::Raw => {
- self.word_nbsp("raw");
- self.print_mutability(mutability, true);
- }
- }
- self.print_expr_maybe_paren(expr, parser::PREC_PREFIX)
- }
-
- pub fn print_expr(&mut self, expr: &ast::Expr) {
- self.print_expr_outer_attr_style(expr, true)
- }
-
- fn print_expr_outer_attr_style(&mut self, expr: &ast::Expr, is_inline: bool) {
- self.maybe_print_comment(expr.span.lo());
-
- let attrs = &expr.attrs;
- if is_inline {
- self.print_outer_attributes_inline(attrs);
- } else {
- self.print_outer_attributes(attrs);
- }
-
- self.ibox(INDENT_UNIT);
- self.ann.pre(self, AnnNode::Expr(expr));
- match expr.kind {
- ast::ExprKind::Box(ref expr) => {
- self.word_space("box");
- self.print_expr_maybe_paren(expr, parser::PREC_PREFIX);
- }
- ast::ExprKind::Array(ref exprs) => {
- self.print_expr_vec(exprs);
- }
- ast::ExprKind::ConstBlock(ref anon_const) => {
- self.print_expr_anon_const(anon_const);
- }
- ast::ExprKind::Repeat(ref element, ref count) => {
- self.print_expr_repeat(element, count);
- }
- ast::ExprKind::Struct(ref se) => {
- self.print_expr_struct(&se.qself, &se.path, &se.fields, &se.rest);
- }
- ast::ExprKind::Tup(ref exprs) => {
- self.print_expr_tup(exprs);
- }
- ast::ExprKind::Call(ref func, ref args) => {
- self.print_expr_call(func, &args);
- }
- ast::ExprKind::MethodCall(ref segment, ref args, _) => {
- self.print_expr_method_call(segment, &args);
- }
- ast::ExprKind::Binary(op, ref lhs, ref rhs) => {
- self.print_expr_binary(op, lhs, rhs);
- }
- ast::ExprKind::Unary(op, ref expr) => {
- self.print_expr_unary(op, expr);
- }
- ast::ExprKind::AddrOf(k, m, ref expr) => {
- self.print_expr_addr_of(k, m, expr);
- }
- ast::ExprKind::Lit(ref lit) => {
- self.print_literal(lit);
- }
- ast::ExprKind::Cast(ref expr, ref ty) => {
- let prec = AssocOp::As.precedence() as i8;
- self.print_expr_maybe_paren(expr, prec);
- self.space();
- self.word_space("as");
- self.print_type(ty);
- }
- ast::ExprKind::Type(ref expr, ref ty) => {
- let prec = AssocOp::Colon.precedence() as i8;
- self.print_expr_maybe_paren(expr, prec);
- self.word_space(":");
- self.print_type(ty);
- }
- ast::ExprKind::Let(ref pat, ref scrutinee, _) => {
- self.print_let(pat, scrutinee);
- }
- ast::ExprKind::If(ref test, ref blk, ref elseopt) => {
- self.print_if(test, blk, elseopt.as_deref())
- }
- ast::ExprKind::While(ref test, ref blk, opt_label) => {
- if let Some(label) = opt_label {
- self.print_ident(label.ident);
- self.word_space(":");
- }
- self.head("while");
- self.print_expr_as_cond(test);
- self.space();
- self.print_block_with_attrs(blk, attrs);
- }
- ast::ExprKind::ForLoop(ref pat, ref iter, ref blk, opt_label) => {
- if let Some(label) = opt_label {
- self.print_ident(label.ident);
- self.word_space(":");
- }
- self.head("for");
- self.print_pat(pat);
- self.space();
- self.word_space("in");
- self.print_expr_as_cond(iter);
- self.space();
- self.print_block_with_attrs(blk, attrs);
- }
- ast::ExprKind::Loop(ref blk, opt_label) => {
- if let Some(label) = opt_label {
- self.print_ident(label.ident);
- self.word_space(":");
- }
- self.head("loop");
- self.print_block_with_attrs(blk, attrs);
- }
- ast::ExprKind::Match(ref expr, ref arms) => {
- self.cbox(INDENT_UNIT);
- self.ibox(INDENT_UNIT);
- self.word_nbsp("match");
- self.print_expr_as_cond(expr);
- self.space();
- self.bopen();
- self.print_inner_attributes_no_trailing_hardbreak(attrs);
- for arm in arms {
- self.print_arm(arm);
- }
- let empty = attrs.is_empty() && arms.is_empty();
- self.bclose(expr.span, empty);
- }
- ast::ExprKind::Closure(
- capture_clause,
- asyncness,
- movability,
- ref decl,
- ref body,
- _,
- ) => {
- self.print_movability(movability);
- self.print_asyncness(asyncness);
- self.print_capture_clause(capture_clause);
-
- self.print_fn_params_and_ret(decl, true);
- self.space();
- self.print_expr(body);
- self.end(); // need to close a box
-
- // a box will be closed by print_expr, but we didn't want an overall
- // wrapper so we closed the corresponding opening. so create an
- // empty box to satisfy the close.
- self.ibox(0);
- }
- ast::ExprKind::Block(ref blk, opt_label) => {
- if let Some(label) = opt_label {
- self.print_ident(label.ident);
- self.word_space(":");
- }
- // containing cbox, will be closed by print-block at }
- self.cbox(INDENT_UNIT);
- // head-box, will be closed by print-block after {
- self.ibox(0);
- self.print_block_with_attrs(blk, attrs);
- }
- ast::ExprKind::Async(capture_clause, _, ref blk) => {
- self.word_nbsp("async");
- self.print_capture_clause(capture_clause);
- // cbox/ibox in analogy to the `ExprKind::Block` arm above
- self.cbox(INDENT_UNIT);
- self.ibox(0);
- self.print_block_with_attrs(blk, attrs);
- }
- ast::ExprKind::Await(ref expr) => {
- self.print_expr_maybe_paren(expr, parser::PREC_POSTFIX);
- self.word(".await");
- }
- ast::ExprKind::Assign(ref lhs, ref rhs, _) => {
- let prec = AssocOp::Assign.precedence() as i8;
- self.print_expr_maybe_paren(lhs, prec + 1);
- self.space();
- self.word_space("=");
- self.print_expr_maybe_paren(rhs, prec);
- }
- ast::ExprKind::AssignOp(op, ref lhs, ref rhs) => {
- let prec = AssocOp::Assign.precedence() as i8;
- self.print_expr_maybe_paren(lhs, prec + 1);
- self.space();
- self.word(op.node.to_string());
- self.word_space("=");
- self.print_expr_maybe_paren(rhs, prec);
- }
- ast::ExprKind::Field(ref expr, ident) => {
- self.print_expr_maybe_paren(expr, parser::PREC_POSTFIX);
- self.word(".");
- self.print_ident(ident);
- }
- ast::ExprKind::Index(ref expr, ref index) => {
- self.print_expr_maybe_paren(expr, parser::PREC_POSTFIX);
- self.word("[");
- self.print_expr(index);
- self.word("]");
- }
- ast::ExprKind::Range(ref start, ref end, limits) => {
- // Special case for `Range`. `AssocOp` claims that `Range` has higher precedence
- // than `Assign`, but `x .. x = x` gives a parse error instead of `x .. (x = x)`.
- // Here we use a fake precedence value so that any child with lower precedence than
- // a "normal" binop gets parenthesized. (`LOr` is the lowest-precedence binop.)
- let fake_prec = AssocOp::LOr.precedence() as i8;
- if let Some(ref e) = *start {
- self.print_expr_maybe_paren(e, fake_prec);
- }
- if limits == ast::RangeLimits::HalfOpen {
- self.word("..");
- } else {
- self.word("..=");
- }
- if let Some(ref e) = *end {
- self.print_expr_maybe_paren(e, fake_prec);
- }
- }
- ast::ExprKind::Underscore => self.word("_"),
- ast::ExprKind::Path(None, ref path) => self.print_path(path, true, 0),
- ast::ExprKind::Path(Some(ref qself), ref path) => self.print_qpath(path, qself, true),
- ast::ExprKind::Break(opt_label, ref opt_expr) => {
- self.word("break");
- if let Some(label) = opt_label {
- self.space();
- self.print_ident(label.ident);
- }
- if let Some(ref expr) = *opt_expr {
- self.space();
- self.print_expr_maybe_paren(expr, parser::PREC_JUMP);
- }
- }
- ast::ExprKind::Continue(opt_label) => {
- self.word("continue");
- if let Some(label) = opt_label {
- self.space();
- self.print_ident(label.ident);
- }
- }
- ast::ExprKind::Ret(ref result) => {
- self.word("return");
- if let Some(ref expr) = *result {
- self.word(" ");
- self.print_expr_maybe_paren(expr, parser::PREC_JUMP);
- }
- }
- ast::ExprKind::InlineAsm(ref a) => {
- self.word("asm!");
- self.print_inline_asm(a);
- }
- ast::ExprKind::LlvmInlineAsm(ref a) => {
- self.word("llvm_asm!");
- self.popen();
- self.print_symbol(a.asm, a.asm_str_style);
- self.word_space(":");
-
- self.commasep(Inconsistent, &a.outputs, |s, out| {
- let constraint = out.constraint.as_str();
- let mut ch = constraint.chars();
- match ch.next() {
- Some('=') if out.is_rw => {
- s.print_string(&format!("+{}", ch.as_str()), ast::StrStyle::Cooked)
- }
- _ => s.print_string(&constraint, ast::StrStyle::Cooked),
- }
- s.popen();
- s.print_expr(&out.expr);
- s.pclose();
- });
- self.space();
- self.word_space(":");
-
- self.commasep(Inconsistent, &a.inputs, |s, &(co, ref o)| {
- s.print_symbol(co, ast::StrStyle::Cooked);
- s.popen();
- s.print_expr(o);
- s.pclose();
- });
- self.space();
- self.word_space(":");
-
- self.commasep(Inconsistent, &a.clobbers, |s, &co| {
- s.print_symbol(co, ast::StrStyle::Cooked);
- });
-
- let mut options = vec![];
- if a.volatile {
- options.push("volatile");
- }
- if a.alignstack {
- options.push("alignstack");
- }
- if a.dialect == ast::LlvmAsmDialect::Intel {
- options.push("intel");
- }
-
- if !options.is_empty() {
- self.space();
- self.word_space(":");
- self.commasep(Inconsistent, &options, |s, &co| {
- s.print_string(co, ast::StrStyle::Cooked);
- });
- }
-
- self.pclose();
- }
- ast::ExprKind::MacCall(ref m) => self.print_mac(m),
- ast::ExprKind::Paren(ref e) => {
- self.popen();
- self.print_expr(e);
- self.pclose();
- }
- ast::ExprKind::Yield(ref e) => {
- self.word("yield");
-
- if let Some(ref expr) = *e {
- self.space();
- self.print_expr_maybe_paren(expr, parser::PREC_JUMP);
- }
- }
- ast::ExprKind::Try(ref e) => {
- self.print_expr_maybe_paren(e, parser::PREC_POSTFIX);
- self.word("?")
- }
- ast::ExprKind::TryBlock(ref blk) => {
- self.head("try");
- self.print_block_with_attrs(blk, attrs)
- }
- ast::ExprKind::Err => {
- self.popen();
- self.word("/*ERROR*/");
- self.pclose()
- }
- }
- self.ann.post(self, AnnNode::Expr(expr));
- self.end();
- }
-
fn print_inline_asm(&mut self, asm: &ast::InlineAsm) {
enum AsmArg<'a> {
Template(String),
self.ann.post(self, AnnNode::Pat(pat))
}
- fn print_arm(&mut self, arm: &ast::Arm) {
- // Note, I have no idea why this check is necessary, but here it is.
- if arm.attrs.is_empty() {
- self.space();
- }
- self.cbox(INDENT_UNIT);
- self.ibox(0);
- self.maybe_print_comment(arm.pat.span.lo());
- self.print_outer_attributes(&arm.attrs);
- self.print_pat(&arm.pat);
- self.space();
- if let Some(ref e) = arm.guard {
- self.word_space("if");
- self.print_expr(e);
- self.space();
- }
- self.word_space("=>");
-
- match arm.body.kind {
- ast::ExprKind::Block(ref blk, opt_label) => {
- if let Some(label) = opt_label {
- self.print_ident(label.ident);
- self.word_space(":");
- }
-
- // The block will close the pattern's ibox.
- self.print_block_unclosed_indent(blk);
-
- // If it is a user-provided unsafe block, print a comma after it.
- if let BlockCheckMode::Unsafe(ast::UserProvided) = blk.rules {
- self.word(",");
- }
- }
- _ => {
- self.end(); // Close the ibox for the pattern.
- self.print_expr(&arm.body);
- self.word(",");
- }
- }
- self.end(); // Close enclosing cbox.
- }
-
fn print_explicit_self(&mut self, explicit_self: &ast::ExplicitSelf) {
match explicit_self.node {
SelfKind::Value(m) => {
}
}
- fn print_fn_full(
- &mut self,
- sig: &ast::FnSig,
- name: Ident,
- generics: &ast::Generics,
- vis: &ast::Visibility,
- defaultness: ast::Defaultness,
- body: Option<&ast::Block>,
- attrs: &[ast::Attribute],
- ) {
- if body.is_some() {
- self.head("");
- }
- self.print_visibility(vis);
- self.print_defaultness(defaultness);
- self.print_fn(&sig.decl, sig.header, Some(name), generics);
- if let Some(body) = body {
- self.nbsp();
- self.print_block_with_attrs(body, attrs);
- } else {
- self.word(";");
- }
- }
-
- crate fn print_fn(
- &mut self,
- decl: &ast::FnDecl,
- header: ast::FnHeader,
- name: Option<Ident>,
- generics: &ast::Generics,
- ) {
- self.print_fn_header_info(header);
- if let Some(name) = name {
- self.nbsp();
- self.print_ident(name);
- }
- self.print_generic_params(&generics.params);
- self.print_fn_params_and_ret(decl, false);
- self.print_where_clause(&generics.where_clause)
- }
-
- crate fn print_fn_params_and_ret(&mut self, decl: &ast::FnDecl, is_closure: bool) {
- let (open, close) = if is_closure { ("|", "|") } else { ("(", ")") };
- self.word(open);
- self.commasep(Inconsistent, &decl.inputs, |s, param| s.print_param(param, is_closure));
- self.word(close);
- self.print_fn_ret_ty(&decl.output)
- }
-
- crate fn print_movability(&mut self, movability: ast::Movability) {
- match movability {
- ast::Movability::Static => self.word_space("static"),
- ast::Movability::Movable => {}
- }
- }
-
crate fn print_asyncness(&mut self, asyncness: ast::Async) {
if asyncness.is_async() {
self.word_nbsp("async");
}
}
- crate fn print_capture_clause(&mut self, capture_clause: ast::CaptureBy) {
- match capture_clause {
- ast::CaptureBy::Value => self.word_space("move"),
- ast::CaptureBy::Ref => {}
- }
- }
-
pub fn print_type_bounds(&mut self, prefix: &'static str, bounds: &[ast::GenericBound]) {
if !bounds.is_empty() {
self.word(prefix);
self.word(">");
}
- crate fn print_where_clause(&mut self, where_clause: &ast::WhereClause) {
- if where_clause.predicates.is_empty() && !where_clause.has_where_token {
- return;
- }
-
- self.space();
- self.word_space("where");
-
- for (i, predicate) in where_clause.predicates.iter().enumerate() {
- if i != 0 {
- self.word_space(",");
- }
-
- self.print_where_predicate(predicate);
- }
- }
-
- pub fn print_where_predicate(&mut self, predicate: &ast::WherePredicate) {
- match predicate {
- ast::WherePredicate::BoundPredicate(ast::WhereBoundPredicate {
- bound_generic_params,
- bounded_ty,
- bounds,
- ..
- }) => {
- self.print_formal_generic_params(bound_generic_params);
- self.print_type(bounded_ty);
- self.print_type_bounds(":", bounds);
- }
- ast::WherePredicate::RegionPredicate(ast::WhereRegionPredicate {
- lifetime,
- bounds,
- ..
- }) => {
- self.print_lifetime_bounds(*lifetime, bounds);
- }
- ast::WherePredicate::EqPredicate(ast::WhereEqPredicate { lhs_ty, rhs_ty, .. }) => {
- self.print_type(lhs_ty);
- self.space();
- self.word_space("=");
- self.print_type(rhs_ty);
- }
- }
- }
-
- crate fn print_use_tree(&mut self, tree: &ast::UseTree) {
- match tree.kind {
- ast::UseTreeKind::Simple(rename, ..) => {
- self.print_path(&tree.prefix, false, 0);
- if let Some(rename) = rename {
- self.space();
- self.word_space("as");
- self.print_ident(rename);
- }
- }
- ast::UseTreeKind::Glob => {
- if !tree.prefix.segments.is_empty() {
- self.print_path(&tree.prefix, false, 0);
- self.word("::");
- }
- self.word("*");
- }
- ast::UseTreeKind::Nested(ref items) => {
- if tree.prefix.segments.is_empty() {
- self.word("{");
- } else {
- self.print_path(&tree.prefix, false, 0);
- self.word("::{");
- }
- self.commasep(Inconsistent, &items, |this, &(ref tree, _)| {
- this.print_use_tree(tree)
- });
- self.word("}");
- }
- }
- }
-
pub fn print_mutability(&mut self, mutbl: ast::Mutability, print_const: bool) {
match mutbl {
ast::Mutability::Mut => self.word_nbsp("mut"),
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