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android / toolchain / rustc / ff3f07ae99a30006dd85b9d73084edd9355c9db6 / . / src / libsyntax / print / pprust.rs
blob: f5a9aded8455e5a40a5bd8ec9ac60fa88e521324 [file] [log] [blame]
use crate::ast::{self, BlockCheckMode, PatKind, RangeEnd, RangeSyntax};
use crate::ast::{SelfKind, GenericBound, TraitBoundModifier};
use crate::ast::{Attribute, MacDelimiter, GenericArg};
use crate::util::parser::{self, AssocOp, Fixity};
use crate::attr;
use crate::source_map::{self, SourceMap, Spanned};
use crate::parse::token::{self, BinOpToken, Nonterminal, Token};
use crate::parse::lexer::comments;
use crate::parse::{self, ParseSess};
use crate::print::pp::{self, Breaks};
use crate::print::pp::Breaks::{Consistent, Inconsistent};
use crate::ptr::P;
use crate::std_inject;
use crate::symbol::keywords;
use crate::tokenstream::{self, TokenStream, TokenTree};
use rustc_target::spec::abi::{self, Abi};
use syntax_pos::{self, BytePos};
use syntax_pos::{DUMMY_SP, FileName};
use std::ascii;
use std::borrow::Cow;
use std::io::{self, Write, Read};
use std::iter::Peekable;
use std::vec;
pub enum AnnNode<'a> {
Ident(&'a ast::Ident),
Name(&'a ast::Name),
Block(&'a ast::Block),
Item(&'a ast::Item),
SubItem(ast::NodeId),
Expr(&'a ast::Expr),
Pat(&'a ast::Pat),
}
pub trait PpAnn {
fn pre(&self, _state: &mut State<'_>, _node: AnnNode<'_>) -> io::Result<()> { Ok(()) }
fn post(&self, _state: &mut State<'_>, _node: AnnNode<'_>) -> io::Result<()> { Ok(()) }
}
#[derive(Copy, Clone)]
pub struct NoAnn;
impl PpAnn for NoAnn {}
pub struct State<'a> {
pub s: pp::Printer<'a>,
cm: Option<&'a SourceMap>,
comments: Option<Vec<comments::Comment> >,
literals: Peekable<vec::IntoIter<comments::Literal>>,
cur_cmnt: usize,
boxes: Vec<pp::Breaks>,
ann: &'a (dyn PpAnn+'a),
is_expanded: bool
}
fn rust_printer<'a>(writer: Box<dyn Write+'a>, ann: &'a dyn PpAnn) -> State<'a> {
State {
s: pp::mk_printer(writer, DEFAULT_COLUMNS),
cm: None,
comments: None,
literals: vec![].into_iter().peekable(),
cur_cmnt: 0,
boxes: Vec::new(),
ann,
is_expanded: false
}
}
pub const INDENT_UNIT: usize = 4;
pub const DEFAULT_COLUMNS: usize = 78;
/// Requires you to pass an input filename and reader so that
/// it can scan the input text for comments and literals to
/// copy forward.
pub fn print_crate<'a>(cm: &'a SourceMap,
sess: &ParseSess,
krate: &ast::Crate,
filename: FileName,
input: &mut dyn Read,
out: Box<dyn Write+'a>,
ann: &'a dyn PpAnn,
is_expanded: bool) -> io::Result<()> {
let mut s = State::new_from_input(cm, sess, filename, input, out, ann, is_expanded);
if is_expanded && std_inject::injected_crate_name().is_some() {
// We need to print `#![no_std]` (and its feature gate) so that
// compiling pretty-printed source won't inject libstd again.
// However we don't want these attributes in the AST because
// of the feature gate, so we fake them up here.
// #![feature(prelude_import)]
let pi_nested = attr::mk_nested_word_item(ast::Ident::from_str("prelude_import"));
let list = attr::mk_list_item(DUMMY_SP, ast::Ident::from_str("feature"), vec![pi_nested]);
let fake_attr = attr::mk_attr_inner(DUMMY_SP, attr::mk_attr_id(), list);
s.print_attribute(&fake_attr)?;
// #![no_std]
let no_std_meta = attr::mk_word_item(ast::Ident::from_str("no_std"));
let fake_attr = attr::mk_attr_inner(DUMMY_SP, attr::mk_attr_id(), no_std_meta);
s.print_attribute(&fake_attr)?;
}
s.print_mod(&krate.module, &krate.attrs)?;
s.print_remaining_comments()?;
s.s.eof()
}
impl<'a> State<'a> {
pub fn new_from_input(cm: &'a 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) },
is_expanded
)
}
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>>,
is_expanded: bool) -> 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,
is_expanded: is_expanded
}
}
}
pub fn to_string<F>(f: F) -> String where
F: FnOnce(&mut State<'_>) -> io::Result<()>,
{
let mut wr = Vec::new();
{
let ann = NoAnn;
let mut printer = rust_printer(Box::new(&mut wr), &ann);
f(&mut printer).unwrap();
printer.s.eof().unwrap();
}
String::from_utf8(wr).unwrap()
}
fn binop_to_string(op: BinOpToken) -> &'static str {
match op {
token::Plus => "+",
token::Minus => "-",
token::Star => "*",
token::Slash => "/",
token::Percent => "%",
token::Caret => "^",
token::And => "&",
token::Or => "|",
token::Shl => "<<",
token::Shr => ">>",
}
}
pub fn token_to_string(tok: &Token) -> String {
match *tok {
token::Eq => "=".to_string(),
token::Lt => "<".to_string(),
token::Le => "<=".to_string(),
token::EqEq => "==".to_string(),
token::Ne => "!=".to_string(),
token::Ge => ">=".to_string(),
token::Gt => ">".to_string(),
token::Not => "!".to_string(),
token::Tilde => "~".to_string(),
token::OrOr => "||".to_string(),
token::AndAnd => "&&".to_string(),
token::BinOp(op) => binop_to_string(op).to_string(),
token::BinOpEq(op) => format!("{}=", binop_to_string(op)),
/* Structural symbols */
token::At => "@".to_string(),
token::Dot => ".".to_string(),
token::DotDot => "..".to_string(),
token::DotDotDot => "...".to_string(),
token::DotDotEq => "..=".to_string(),
token::Comma => ",".to_string(),
token::Semi => ";".to_string(),
token::Colon => ":".to_string(),
token::ModSep => "::".to_string(),
token::RArrow => "->".to_string(),
token::LArrow => "<-".to_string(),
token::FatArrow => "=>".to_string(),
token::OpenDelim(token::Paren) => "(".to_string(),
token::CloseDelim(token::Paren) => ")".to_string(),
token::OpenDelim(token::Bracket) => "[".to_string(),
token::CloseDelim(token::Bracket) => "]".to_string(),
token::OpenDelim(token::Brace) => "{".to_string(),
token::CloseDelim(token::Brace) => "}".to_string(),
token::OpenDelim(token::NoDelim) |
token::CloseDelim(token::NoDelim) => " ".to_string(),
token::Pound => "#".to_string(),
token::Dollar => "$".to_string(),
token::Question => "?".to_string(),
token::SingleQuote => "'".to_string(),
/* Literals */
token::Literal(lit, suf) => {
let mut out = match lit {
token::Byte(b) => format!("b'{}'", b),
token::Char(c) => format!("'{}'", c),
token::Err(c) => format!("'{}'", c),
token::Float(c) |
token::Integer(c) => c.to_string(),
token::Str_(s) => format!("\"{}\"", s),
token::StrRaw(s, n) => format!("r{delim}\"{string}\"{delim}",
delim="#".repeat(n as usize),
string=s),
token::ByteStr(v) => format!("b\"{}\"", v),
token::ByteStrRaw(s, n) => format!("br{delim}\"{string}\"{delim}",
delim="#".repeat(n as usize),
string=s),
};
if let Some(s) = suf {
out.push_str(&s.as_str())
}
out
}
/* Name components */
token::Ident(s, false) => s.to_string(),
token::Ident(s, true) => format!("r#{}", s),
token::Lifetime(s) => s.to_string(),
/* Other */
token::DocComment(s) => s.to_string(),
token::Eof => "<eof>".to_string(),
token::Whitespace => " ".to_string(),
token::Comment => "/* */".to_string(),
token::Shebang(s) => format!("/* shebang: {}*/", s),
token::Interpolated(ref nt) => nonterminal_to_string(nt),
}
}
pub fn nonterminal_to_string(nt: &Nonterminal) -> String {
match *nt {
token::NtExpr(ref e) => expr_to_string(e),
token::NtMeta(ref e) => meta_item_to_string(e),
token::NtTy(ref e) => ty_to_string(e),
token::NtPath(ref e) => path_to_string(e),
token::NtItem(ref e) => item_to_string(e),
token::NtBlock(ref e) => block_to_string(e),
token::NtStmt(ref e) => stmt_to_string(e),
token::NtPat(ref e) => pat_to_string(e),
token::NtIdent(e, false) => ident_to_string(e),
token::NtIdent(e, true) => format!("r#{}", ident_to_string(e)),
token::NtLifetime(e) => ident_to_string(e),
token::NtLiteral(ref e) => expr_to_string(e),
token::NtTT(ref tree) => tt_to_string(tree.clone()),
token::NtArm(ref e) => arm_to_string(e),
token::NtImplItem(ref e) => impl_item_to_string(e),
token::NtTraitItem(ref e) => trait_item_to_string(e),
token::NtGenerics(ref e) => generic_params_to_string(&e.params),
token::NtWhereClause(ref e) => where_clause_to_string(e),
token::NtArg(ref e) => arg_to_string(e),
token::NtVis(ref e) => vis_to_string(e),
token::NtForeignItem(ref e) => foreign_item_to_string(e),
}
}
pub fn ty_to_string(ty: &ast::Ty) -> String {
to_string(|s| s.print_type(ty))
}
pub fn bounds_to_string(bounds: &[ast::GenericBound]) -> String {
to_string(|s| s.print_type_bounds("", bounds))
}
pub fn pat_to_string(pat: &ast::Pat) -> String {
to_string(|s| s.print_pat(pat))
}
pub fn arm_to_string(arm: &ast::Arm) -> String {
to_string(|s| s.print_arm(arm))
}
pub fn expr_to_string(e: &ast::Expr) -> String {
to_string(|s| s.print_expr(e))
}
pub fn lifetime_to_string(lt: &ast::Lifetime) -> String {
to_string(|s| s.print_lifetime(*lt))
}
pub fn tt_to_string(tt: tokenstream::TokenTree) -> String {
to_string(|s| s.print_tt(tt))
}
pub fn tts_to_string(tts: &[tokenstream::TokenTree]) -> String {
to_string(|s| s.print_tts(tts.iter().cloned().collect()))
}
pub fn tokens_to_string(tokens: TokenStream) -> String {
to_string(|s| s.print_tts(tokens))
}
pub fn stmt_to_string(stmt: &ast::Stmt) -> String {
to_string(|s| s.print_stmt(stmt))
}
pub fn attr_to_string(attr: &ast::Attribute) -> String {
to_string(|s| s.print_attribute(attr))
}
pub fn item_to_string(i: &ast::Item) -> String {
to_string(|s| s.print_item(i))
}
pub fn impl_item_to_string(i: &ast::ImplItem) -> String {
to_string(|s| s.print_impl_item(i))
}
pub fn trait_item_to_string(i: &ast::TraitItem) -> String {
to_string(|s| s.print_trait_item(i))
}
pub fn generic_params_to_string(generic_params: &[ast::GenericParam]) -> String {
to_string(|s| s.print_generic_params(generic_params))
}
pub fn where_clause_to_string(i: &ast::WhereClause) -> String {
to_string(|s| s.print_where_clause(i))
}
pub fn fn_block_to_string(p: &ast::FnDecl) -> String {
to_string(|s| s.print_fn_block_args(p))
}
pub fn path_to_string(p: &ast::Path) -> String {
to_string(|s| s.print_path(p, false, 0))
}
pub fn path_segment_to_string(p: &ast::PathSegment) -> String {
to_string(|s| s.print_path_segment(p, false))
}
pub fn ident_to_string(id: ast::Ident) -> String {
to_string(|s| s.print_ident(id))
}
pub fn vis_to_string(v: &ast::Visibility) -> String {
to_string(|s| s.print_visibility(v))
}
pub fn fun_to_string(decl: &ast::FnDecl,
header: ast::FnHeader,
name: ast::Ident,
generics: &ast::Generics)
-> String {
to_string(|s| {
s.head("")?;
s.print_fn(decl, header, Some(name),
generics, &source_map::dummy_spanned(ast::VisibilityKind::Inherited))?;
s.end()?; // Close the head box
s.end() // Close the outer box
})
}
pub fn block_to_string(blk: &ast::Block) -> String {
to_string(|s| {
// containing cbox, will be closed by print-block at }
s.cbox(INDENT_UNIT)?;
// head-ibox, will be closed by print-block after {
s.ibox(0)?;
s.print_block(blk)
})
}
pub fn meta_list_item_to_string(li: &ast::NestedMetaItem) -> String {
to_string(|s| s.print_meta_list_item(li))
}
pub fn meta_item_to_string(mi: &ast::MetaItem) -> String {
to_string(|s| s.print_meta_item(mi))
}
pub fn attribute_to_string(attr: &ast::Attribute) -> String {
to_string(|s| s.print_attribute(attr))
}
pub fn lit_to_string(l: &ast::Lit) -> String {
to_string(|s| s.print_literal(l))
}
pub fn variant_to_string(var: &ast::Variant) -> String {
to_string(|s| s.print_variant(var))
}
pub fn arg_to_string(arg: &ast::Arg) -> String {
to_string(|s| s.print_arg(arg, false))
}
pub fn mac_to_string(arg: &ast::Mac) -> String {
to_string(|s| s.print_mac(arg))
}
pub fn foreign_item_to_string(arg: &ast::ForeignItem) -> String {
to_string(|s| s.print_foreign_item(arg))
}
pub fn visibility_qualified(vis: &ast::Visibility, s: &str) -> String {
format!("{}{}", to_string(|s| s.print_visibility(vis)), s)
}
pub trait PrintState<'a> {
fn writer(&mut self) -> &mut pp::Printer<'a>;
fn boxes(&mut self) -> &mut Vec<pp::Breaks>;
fn comments(&mut self) -> &mut Option<Vec<comments::Comment>>;
fn cur_cmnt(&mut self) -> &mut usize;
fn cur_lit(&mut self) -> Option<&comments::Literal>;
fn bump_lit(&mut self) -> Option<comments::Literal>;
fn word_space<S: Into<Cow<'static, str>>>(&mut self, w: S) -> io::Result<()> {
self.writer().word(w)?;
self.writer().space()
}
fn popen(&mut self) -> io::Result<()> { self.writer().word("(") }
fn pclose(&mut self) -> io::Result<()> { self.writer().word(")") }
fn is_begin(&mut self) -> bool {
match self.writer().last_token() {
pp::Token::Begin(_) => true,
_ => false,
}
}
fn is_end(&mut self) -> bool {
match self.writer().last_token() {
pp::Token::End => true,
_ => false,
}
}
// is this the beginning of a line?
fn is_bol(&mut self) -> bool {
self.writer().last_token().is_eof() || self.writer().last_token().is_hardbreak_tok()
}
fn hardbreak_if_not_bol(&mut self) -> io::Result<()> {
if !self.is_bol() {
self.writer().hardbreak()?
}
Ok(())
}
// "raw box"
fn rbox(&mut self, u: usize, b: pp::Breaks) -> io::Result<()> {
self.boxes().push(b);
self.writer().rbox(u, b)
}
fn ibox(&mut self, u: usize) -> io::Result<()> {
self.boxes().push(pp::Breaks::Inconsistent);
self.writer().ibox(u)
}
fn end(&mut self) -> io::Result<()> {
self.boxes().pop().unwrap();
self.writer().end()
}
fn commasep<T, F>(&mut self, b: Breaks, elts: &[T], mut op: F) -> io::Result<()>
where F: FnMut(&mut Self, &T) -> io::Result<()>,
{
self.rbox(0, b)?;
let mut first = true;
for elt in elts {
if first { first = false; } else { self.word_space(",")?; }
op(self, elt)?;
}
self.end()
}
fn next_lit(&mut self, pos: BytePos) -> Option<comments::Literal> {
while let Some(ltrl) = self.cur_lit().cloned() {
if ltrl.pos > pos { break; }
// we don't need the value here since we're forced to clone cur_lit
// due to lack of NLL.
self.bump_lit();
if ltrl.pos == pos {
return Some(ltrl);
}
}
None
}
fn maybe_print_comment(&mut self, pos: BytePos) -> io::Result<()> {
while let Some(ref cmnt) = self.next_comment() {
if cmnt.pos < pos {
self.print_comment(cmnt)?;
} else {
break
}
}
Ok(())
}
fn print_comment(&mut self,
cmnt: &comments::Comment) -> io::Result<()> {
let r = match cmnt.style {
comments::Mixed => {
assert_eq!(cmnt.lines.len(), 1);
self.writer().zerobreak()?;
self.writer().word(cmnt.lines[0].clone())?;
self.writer().zerobreak()
}
comments::Isolated => {
self.hardbreak_if_not_bol()?;
for line in &cmnt.lines {
// Don't print empty lines because they will end up as trailing
// whitespace
if !line.is_empty() {
self.writer().word(line.clone())?;
}
self.writer().hardbreak()?;
}
Ok(())
}
comments::Trailing => {
if !self.is_bol() {
self.writer().word(" ")?;
}
if cmnt.lines.len() == 1 {
self.writer().word(cmnt.lines[0].clone())?;
self.writer().hardbreak()
} else {
self.ibox(0)?;
for line in &cmnt.lines {
if !line.is_empty() {
self.writer().word(line.clone())?;
}
self.writer().hardbreak()?;
}
self.end()
}
}
comments::BlankLine => {
// We need to do at least one, possibly two hardbreaks.
let is_semi = match self.writer().last_token() {
pp::Token::String(s, _) => ";" == s,
_ => false
};
if is_semi || self.is_begin() || self.is_end() {
self.writer().hardbreak()?;
}
self.writer().hardbreak()
}
};
match r {
Ok(()) => {
*self.cur_cmnt() = *self.cur_cmnt() + 1;
Ok(())
}
Err(e) => Err(e),
}
}
fn next_comment(&mut self) -> Option<comments::Comment> {
let cur_cmnt = *self.cur_cmnt();
match *self.comments() {
Some(ref cmnts) => {
if cur_cmnt < cmnts.len() {
Some(cmnts[cur_cmnt].clone())
} else {
None
}
}
_ => None
}
}
fn print_literal(&mut self, lit: &ast::Lit) -> io::Result<()> {
self.maybe_print_comment(lit.span.lo())?;
if let Some(ltrl) = self.next_lit(lit.span.lo()) {
return self.writer().word(ltrl.lit.clone());
}
match lit.node {
ast::LitKind::Str(st, style) => self.print_string(&st.as_str(), style),
ast::LitKind::Err(st) => {
let st = st.as_str().escape_debug().to_string();
let mut res = String::with_capacity(st.len() + 2);
res.push('\'');
res.push_str(&st);
res.push('\'');
self.writer().word(res)
}
ast::LitKind::Byte(byte) => {
let mut res = String::from("b'");
res.extend(ascii::escape_default(byte).map(|c| c as char));
res.push('\'');
self.writer().word(res)
}
ast::LitKind::Char(ch) => {
let mut res = String::from("'");
res.extend(ch.escape_default());
res.push('\'');
self.writer().word(res)
}
ast::LitKind::Int(i, t) => {
match t {
ast::LitIntType::Signed(st) => {
self.writer().word(st.val_to_string(i as i128))
}
ast::LitIntType::Unsigned(ut) => {
self.writer().word(ut.val_to_string(i))
}
ast::LitIntType::Unsuffixed => {
self.writer().word(i.to_string())
}
}
}
ast::LitKind::Float(ref f, t) => {
self.writer().word(format!("{}{}", &f, t.ty_to_string()))
}
ast::LitKind::FloatUnsuffixed(ref f) => self.writer().word(f.as_str().get()),
ast::LitKind::Bool(val) => {
if val { self.writer().word("true") } else { self.writer().word("false") }
}
ast::LitKind::ByteStr(ref v) => {
let mut escaped: String = String::new();
for &ch in v.iter() {
escaped.extend(ascii::escape_default(ch)
.map(|c| c as char));
}
self.writer().word(format!("b\"{}\"", escaped))
}
}
}
fn print_string(&mut self, st: &str,
style: ast::StrStyle) -> io::Result<()> {
let st = match style {
ast::StrStyle::Cooked => {
(format!("\"{}\"", st.escape_debug()))
}
ast::StrStyle::Raw(n) => {
(format!("r{delim}\"{string}\"{delim}",
delim="#".repeat(n as usize),
string=st))
}
};
self.writer().word(st)
}
fn print_inner_attributes(&mut self,
attrs: &[ast::Attribute]) -> io::Result<()> {
self.print_either_attributes(attrs, ast::AttrStyle::Inner, false, true)
}
fn print_inner_attributes_no_trailing_hardbreak(&mut self,
attrs: &[ast::Attribute])
-> io::Result<()> {
self.print_either_attributes(attrs, ast::AttrStyle::Inner, false, false)
}
fn print_outer_attributes(&mut self,
attrs: &[ast::Attribute]) -> io::Result<()> {
self.print_either_attributes(attrs, ast::AttrStyle::Outer, false, true)
}
fn print_inner_attributes_inline(&mut self,
attrs: &[ast::Attribute]) -> io::Result<()> {
self.print_either_attributes(attrs, ast::AttrStyle::Inner, true, true)
}
fn print_outer_attributes_inline(&mut self,
attrs: &[ast::Attribute]) -> io::Result<()> {
self.print_either_attributes(attrs, ast::AttrStyle::Outer, true, true)
}
fn print_either_attributes(&mut self,
attrs: &[ast::Attribute],
kind: ast::AttrStyle,
is_inline: bool,
trailing_hardbreak: bool) -> io::Result<()> {
let mut count = 0;
for attr in attrs {
if attr.style == kind {
self.print_attribute_inline(attr, is_inline)?;
if is_inline {
self.nbsp()?;
}
count += 1;
}
}
if count > 0 && trailing_hardbreak && !is_inline {
self.hardbreak_if_not_bol()?;
}
Ok(())
}
fn print_attribute_path(&mut self, path: &ast::Path) -> io::Result<()> {
for (i, segment) in path.segments.iter().enumerate() {
if i > 0 {
self.writer().word("::")?
}
if segment.ident.name != keywords::PathRoot.name() {
if segment.ident.name == keywords::DollarCrate.name() {
self.print_dollar_crate(segment.ident)?;
} else {
self.writer().word(segment.ident.as_str().get())?;
}
}
}
Ok(())
}
fn print_attribute(&mut self, attr: &ast::Attribute) -> io::Result<()> {
self.print_attribute_inline(attr, false)
}
fn print_attribute_inline(&mut self, attr: &ast::Attribute,
is_inline: bool) -> io::Result<()> {
if !is_inline {
self.hardbreak_if_not_bol()?;
}
self.maybe_print_comment(attr.span.lo())?;
if attr.is_sugared_doc {
self.writer().word(attr.value_str().unwrap().as_str().get())?;
self.writer().hardbreak()
} else {
match attr.style {
ast::AttrStyle::Inner => self.writer().word("#![")?,
ast::AttrStyle::Outer => self.writer().word("#[")?,
}
if let Some(mi) = attr.meta() {
self.print_meta_item(&mi)?
} else {
self.print_attribute_path(&attr.path)?;
self.writer().space()?;
self.print_tts(attr.tokens.clone())?;
}
self.writer().word("]")
}
}
fn print_meta_list_item(&mut self, item: &ast::NestedMetaItem) -> io::Result<()> {
match item {
ast::NestedMetaItem::MetaItem(ref mi) => {
self.print_meta_item(mi)
},
ast::NestedMetaItem::Literal(ref lit) => {
self.print_literal(lit)
}
}
}
fn print_meta_item(&mut self, item: &ast::MetaItem) -> io::Result<()> {
self.ibox(INDENT_UNIT)?;
match item.node {
ast::MetaItemKind::Word => self.print_attribute_path(&item.path)?,
ast::MetaItemKind::NameValue(ref value) => {
self.print_attribute_path(&item.path)?;
self.writer().space()?;
self.word_space("=")?;
self.print_literal(value)?;
}
ast::MetaItemKind::List(ref items) => {
self.print_attribute_path(&item.path)?;
self.popen()?;
self.commasep(Consistent,
&items[..],
|s, i| s.print_meta_list_item(i))?;
self.pclose()?;
}
}
self.end()
}
/// This doesn't deserve to be called "pretty" printing, but it should be
/// meaning-preserving. A quick hack that might help would be to look at the
/// spans embedded in the TTs to decide where to put spaces and newlines.
/// But it'd be better to parse these according to the grammar of the
/// appropriate macro, transcribe back into the grammar we just parsed from,
/// and then pretty-print the resulting AST nodes (so, e.g., we print
/// expression arguments as expressions). It can be done! I think.
fn print_tt(&mut self, tt: tokenstream::TokenTree) -> io::Result<()> {
match tt {
TokenTree::Token(_, ref tk) => {
self.writer().word(token_to_string(tk))?;
match *tk {
parse::token::DocComment(..) => {
self.writer().hardbreak()
}
_ => Ok(())
}
}
TokenTree::Delimited(_, delim, tts) => {
self.writer().word(token_to_string(&token::OpenDelim(delim)))?;
self.writer().space()?;
self.print_tts(tts)?;
self.writer().space()?;
self.writer().word(token_to_string(&token::CloseDelim(delim)))
},
}
}
fn print_tts(&mut self, tts: tokenstream::TokenStream) -> io::Result<()> {
self.ibox(0)?;
for (i, tt) in tts.into_trees().enumerate() {
if i != 0 {
self.writer().space()?;
}
self.print_tt(tt)?;
}
self.end()
}
fn space_if_not_bol(&mut self) -> io::Result<()> {
if !self.is_bol() { self.writer().space()?; }
Ok(())
}
fn nbsp(&mut self) -> io::Result<()> { self.writer().word(" ") }
// AST pretty-printer is used as a fallback for turning AST structures into token streams for
// proc macros. Additionally, proc macros may stringify their input and expect it survive the
// stringification (especially true for proc macro derives written between Rust 1.15 and 1.30).
// So we need to somehow pretty-print `$crate` in paths in a way preserving at least some of
// its hygiene data, most importantly name of the crate it refers to.
// As a result we print `$crate` as `crate` if it refers to the local crate
// and as `::other_crate_name` if it refers to some other crate.
fn print_dollar_crate(&mut self, ident: ast::Ident) -> io::Result<()> {
let name = ident.span.ctxt().dollar_crate_name();
if !ast::Ident::with_empty_ctxt(name).is_path_segment_keyword() {
self.writer().word("::")?;
}
self.writer().word(name.as_str().get())
}
}
impl<'a> PrintState<'a> for State<'a> {
fn writer(&mut self) -> &mut pp::Printer<'a> {
&mut self.s
}
fn boxes(&mut self) -> &mut Vec<pp::Breaks> {
&mut self.boxes
}
fn comments(&mut self) -> &mut Option<Vec<comments::Comment>> {
&mut self.comments
}
fn cur_cmnt(&mut self) -> &mut usize {
&mut self.cur_cmnt
}
fn cur_lit(&mut self) -> Option<&comments::Literal> {
self.literals.peek()
}
fn bump_lit(&mut self) -> Option<comments::Literal> {
self.literals.next()
}
}
impl<'a> State<'a> {
pub fn cbox(&mut self, u: usize) -> io::Result<()> {
self.boxes.push(pp::Breaks::Consistent);
self.s.cbox(u)
}
pub fn word_nbsp<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 break_offset_if_not_bol(&mut self, n: usize,
off: isize) -> io::Result<()> {
if !self.is_bol() {
self.s.break_offset(n, off)
} else {
if off != 0 && self.s.last_token().is_hardbreak_tok() {
// We do something pretty sketchy here: tuck the nonzero
// offset-adjustment we were going to deposit along with the
// break into the previous hardbreak.
self.s.replace_last_token(pp::Printer::hardbreak_tok_offset(off));
}
Ok(())
}
}
// Synthesizes a comment that was not textually present in the original source
// file.
pub fn synth_comment(&mut self, text: String) -> io::Result<()> {
self.s.word("/*")?;
self.s.space()?;
self.s.word(text)?;
self.s.space()?;
self.s.word("*/")
}
pub fn commasep_cmnt<T, F, G>(&mut self,
b: Breaks,
elts: &[T],
mut op: F,
mut get_span: G) -> io::Result<()> where
F: FnMut(&mut State<'_>, &T) -> io::Result<()>,
G: FnMut(&T) -> syntax_pos::Span,
{
self.rbox(0, b)?;
let len = elts.len();
let mut i = 0;
for elt in elts {
self.maybe_print_comment(get_span(elt).hi())?;
op(self, elt)?;
i += 1;
if i < len {
self.s.word(",")?;
self.maybe_print_trailing_comment(get_span(elt),
Some(get_span(&elts[i]).hi()))?;
self.space_if_not_bol()?;
}
}
self.end()
}
pub fn commasep_exprs(&mut self, b: Breaks,
exprs: &[P<ast::Expr>]) -> io::Result<()> {
self.commasep_cmnt(b, exprs, |s, e| s.print_expr(e), |e| e.span)
}
pub fn print_mod(&mut self, _mod: &ast::Mod,
attrs: &[ast::Attribute]) -> io::Result<()> {
self.print_inner_attributes(attrs)?;
for item in &_mod.items {
self.print_item(item)?;
}
Ok(())
}
pub fn print_foreign_mod(&mut self, nmod: &ast::ForeignMod,
attrs: &[ast::Attribute]) -> io::Result<()> {
self.print_inner_attributes(attrs)?;
for item in &nmod.items {
self.print_foreign_item(item)?;
}
Ok(())
}
pub fn print_opt_lifetime(&mut self, lifetime: &Option<ast::Lifetime>) -> io::Result<()> {
if let Some(lt) = *lifetime {
self.print_lifetime(lt)?;
self.nbsp()?;
}
Ok(())
}
pub fn print_generic_arg(&mut self, generic_arg: &GenericArg) -> io::Result<()> {
match generic_arg {
GenericArg::Lifetime(lt) => self.print_lifetime(*lt),
GenericArg::Type(ty) => self.print_type(ty),
GenericArg::Const(ct) => self.print_expr(&ct.value),
}
}
pub fn print_type(&mut self, ty: &ast::Ty) -> io::Result<()> {
self.maybe_print_comment(ty.span.lo())?;
self.ibox(0)?;
match ty.node {
ast::TyKind::Slice(ref ty) => {
self.s.word("[")?;
self.print_type(ty)?;
self.s.word("]")?;
}
ast::TyKind::Ptr(ref mt) => {
self.s.word("*")?;
match mt.mutbl {
ast::Mutability::Mutable => self.word_nbsp("mut")?,
ast::Mutability::Immutable => self.word_nbsp("const")?,
}
self.print_type(&mt.ty)?;
}
ast::TyKind::Rptr(ref lifetime, ref mt) => {
self.s.word("&")?;
self.print_opt_lifetime(lifetime)?;
self.print_mt(mt)?;
}
ast::TyKind::Never => {
self.s.word("!")?;
},
ast::TyKind::Tup(ref elts) => {
self.popen()?;
self.commasep(Inconsistent, &elts[..],
|s, ty| s.print_type(ty))?;
if elts.len() == 1 {
self.s.word(",")?;
}
self.pclose()?;
}
ast::TyKind::Paren(ref typ) => {
self.popen()?;
self.print_type(typ)?;
self.pclose()?;
}
ast::TyKind::BareFn(ref f) => {
self.print_ty_fn(f.abi,
f.unsafety,
&f.decl,
None,
&f.generic_params)?;
}
ast::TyKind::Path(None, ref path) => {
self.print_path(path, false, 0)?;
}
ast::TyKind::Path(Some(ref qself), ref path) => {
self.print_qpath(path, qself, false)?
}
ast::TyKind::TraitObject(ref bounds, syntax) => {
let prefix = if syntax == ast::TraitObjectSyntax::Dyn { "dyn" } else { "" };
self.print_type_bounds(prefix, &bounds[..])?;
}
ast::TyKind::ImplTrait(_, ref bounds) => {
self.print_type_bounds("impl", &bounds[..])?;
}
ast::TyKind::Array(ref ty, ref length) => {
self.s.word("[")?;
self.print_type(ty)?;
self.s.word("; ")?;
self.print_expr(&length.value)?;
self.s.word("]")?;
}
ast::TyKind::Typeof(ref e) => {
self.s.word("typeof(")?;
self.print_expr(&e.value)?;
self.s.word(")")?;
}
ast::TyKind::Infer => {
self.s.word("_")?;
}
ast::TyKind::Err => {
self.popen()?;
self.s.word("/*ERROR*/")?;
self.pclose()?;
}
ast::TyKind::ImplicitSelf => {
self.s.word("Self")?;
}
ast::TyKind::Mac(ref m) => {
self.print_mac(m)?;
}
ast::TyKind::CVarArgs => {
self.s.word("...")?;
}
}
self.end()
}
pub fn print_foreign_item(&mut self,
item: &ast::ForeignItem) -> io::Result<()> {
self.hardbreak_if_not_bol()?;
self.maybe_print_comment(item.span.lo())?;
self.print_outer_attributes(&item.attrs)?;
match item.node {
ast::ForeignItemKind::Fn(ref decl, ref generics) => {
self.head("")?;
self.print_fn(decl, ast::FnHeader::default(),
Some(item.ident),
generics, &item.vis)?;
self.end()?; // end head-ibox
self.s.word(";")?;
self.end() // end the outer fn box
}
ast::ForeignItemKind::Static(ref t, m) => {
self.head(visibility_qualified(&item.vis, "static"))?;
if m {
self.word_space("mut")?;
}
self.print_ident(item.ident)?;
self.word_space(":")?;
self.print_type(t)?;
self.s.word(";")?;
self.end()?; // end the head-ibox
self.end() // end the outer cbox
}
ast::ForeignItemKind::Ty => {
self.head(visibility_qualified(&item.vis, "type"))?;
self.print_ident(item.ident)?;
self.s.word(";")?;
self.end()?; // end the head-ibox
self.end() // end the outer cbox
}
ast::ForeignItemKind::Macro(ref m) => {
self.print_mac(m)?;
match m.node.delim {
MacDelimiter::Brace => Ok(()),
_ => self.s.word(";")
}
}
}
}
fn print_associated_const(&mut self,
ident: ast::Ident,
ty: &ast::Ty,
default: Option<&ast::Expr>,
vis: &ast::Visibility)
-> io::Result<()>
{
self.s.word(visibility_qualified(vis, ""))?;
self.word_space("const")?;
self.print_ident(ident)?;
self.word_space(":")?;
self.print_type(ty)?;
if let Some(expr) = default {
self.s.space()?;
self.word_space("=")?;
self.print_expr(expr)?;
}
self.s.word(";")
}
fn print_associated_type(&mut self,
ident: ast::Ident,
bounds: Option<&ast::GenericBounds>,
ty: Option<&ast::Ty>)
-> io::Result<()> {
self.word_space("type")?;
self.print_ident(ident)?;
if let Some(bounds) = bounds {
self.print_type_bounds(":", bounds)?;
}
if let Some(ty) = ty {
self.s.space()?;
self.word_space("=")?;
self.print_type(ty)?;
}
self.s.word(";")
}
/// Pretty-print an item
pub fn print_item(&mut self, item: &ast::Item) -> io::Result<()> {
self.hardbreak_if_not_bol()?;
self.maybe_print_comment(item.span.lo())?;
self.print_outer_attributes(&item.attrs)?;
self.ann.pre(self, AnnNode::Item(item))?;
match item.node {
ast::ItemKind::ExternCrate(orig_name) => {
self.head(visibility_qualified(&item.vis, "extern crate"))?;
if let Some(orig_name) = orig_name {
self.print_name(orig_name)?;
self.s.space()?;
self.s.word("as")?;
self.s.space()?;
}
self.print_ident(item.ident)?;
self.s.word(";")?;
self.end()?; // end inner head-block
self.end()?; // end outer head-block
}
ast::ItemKind::Use(ref tree) => {
self.head(visibility_qualified(&item.vis, "use"))?;
self.print_use_tree(tree)?;
self.s.word(";")?;
self.end()?; // end inner head-block
self.end()?; // end outer head-block
}
ast::ItemKind::Static(ref ty, m, ref expr) => {
self.head(visibility_qualified(&item.vis, "static"))?;
if m == ast::Mutability::Mutable {
self.word_space("mut")?;
}
self.print_ident(item.ident)?;
self.word_space(":")?;
self.print_type(ty)?;
self.s.space()?;
self.end()?; // end the head-ibox
self.word_space("=")?;
self.print_expr(expr)?;
self.s.word(";")?;
self.end()?; // end the outer cbox
}
ast::ItemKind::Const(ref ty, ref expr) => {
self.head(visibility_qualified(&item.vis, "const"))?;
self.print_ident(item.ident)?;
self.word_space(":")?;
self.print_type(ty)?;
self.s.space()?;
self.end()?; // end the head-ibox
self.word_space("=")?;
self.print_expr(expr)?;
self.s.word(";")?;
self.end()?; // end the outer cbox
}
ast::ItemKind::Fn(ref decl, header, ref param_names, ref body) => {
self.head("")?;
self.print_fn(
decl,
header,
Some(item.ident),
param_names,
&item.vis
)?;
self.s.word(" ")?;
self.print_block_with_attrs(body, &item.attrs)?;
}
ast::ItemKind::Mod(ref _mod) => {
self.head(visibility_qualified(&item.vis, "mod"))?;
self.print_ident(item.ident)?;
if _mod.inline || self.is_expanded {
self.nbsp()?;
self.bopen()?;
self.print_mod(_mod, &item.attrs)?;
self.bclose(item.span)?;
} else {
self.s.word(";")?;
self.end()?; // end inner head-block
self.end()?; // end outer head-block
}
}
ast::ItemKind::ForeignMod(ref nmod) => {
self.head("extern")?;
self.word_nbsp(nmod.abi.to_string())?;
self.bopen()?;
self.print_foreign_mod(nmod, &item.attrs)?;
self.bclose(item.span)?;
}
ast::ItemKind::GlobalAsm(ref ga) => {
self.head(visibility_qualified(&item.vis, "global_asm!"))?;
self.s.word(ga.asm.as_str().get())?;
self.end()?;
}
ast::ItemKind::Ty(ref ty, ref generics) => {
self.head(visibility_qualified(&item.vis, "type"))?;
self.print_ident(item.ident)?;
self.print_generic_params(&generics.params)?;
self.end()?; // end the inner ibox
self.print_where_clause(&generics.where_clause)?;
self.s.space()?;
self.word_space("=")?;
self.print_type(ty)?;
self.s.word(";")?;
self.end()?; // end the outer ibox
}
ast::ItemKind::Existential(ref bounds, ref generics) => {
self.head(visibility_qualified(&item.vis, "existential type"))?;
self.print_ident(item.ident)?;
self.print_generic_params(&generics.params)?;
self.end()?; // end the inner ibox
self.print_where_clause(&generics.where_clause)?;
self.s.space()?;
self.print_type_bounds(":", bounds)?;
self.s.word(";")?;
self.end()?; // end the outer ibox
}
ast::ItemKind::Enum(ref enum_definition, ref params) => {
self.print_enum_def(
enum_definition,
params,
item.ident,
item.span,
&item.vis
)?;
}
ast::ItemKind::Struct(ref struct_def, ref generics) => {
self.head(visibility_qualified(&item.vis, "struct"))?;
self.print_struct(struct_def, generics, item.ident, item.span, true)?;
}
ast::ItemKind::Union(ref struct_def, ref generics) => {
self.head(visibility_qualified(&item.vis, "union"))?;
self.print_struct(struct_def, generics, item.ident, item.span, true)?;
}
ast::ItemKind::Impl(unsafety,
polarity,
defaultness,
ref generics,
ref opt_trait,
ref ty,
ref impl_items) => {
self.head("")?;
self.print_visibility(&item.vis)?;
self.print_defaultness(defaultness)?;
self.print_unsafety(unsafety)?;
self.word_nbsp("impl")?;
if !generics.params.is_empty() {
self.print_generic_params(&generics.params)?;
self.s.space()?;
}
if polarity == ast::ImplPolarity::Negative {
self.s.word("!")?;
}
if let Some(ref t) = *opt_trait {
self.print_trait_ref(t)?;
self.s.space()?;
self.word_space("for")?;
}
self.print_type(ty)?;
self.print_where_clause(&generics.where_clause)?;
self.s.space()?;
self.bopen()?;
self.print_inner_attributes(&item.attrs)?;
for impl_item in impl_items {
self.print_impl_item(impl_item)?;
}
self.bclose(item.span)?;
}
ast::ItemKind::Trait(is_auto, unsafety, ref generics, ref bounds, ref trait_items) => {
self.head("")?;
self.print_visibility(&item.vis)?;
self.print_unsafety(unsafety)?;
self.print_is_auto(is_auto)?;
self.word_nbsp("trait")?;
self.print_ident(item.ident)?;
self.print_generic_params(&generics.params)?;
let mut real_bounds = Vec::with_capacity(bounds.len());
for b in bounds.iter() {
if let GenericBound::Trait(ref ptr, ast::TraitBoundModifier::Maybe) = *b {
self.s.space()?;
self.word_space("for ?")?;
self.print_trait_ref(&ptr.trait_ref)?;
} else {
real_bounds.push(b.clone());
}
}
self.print_type_bounds(":", &real_bounds[..])?;
self.print_where_clause(&generics.where_clause)?;
self.s.word(" ")?;
self.bopen()?;
for trait_item in trait_items {
self.print_trait_item(trait_item)?;
}
self.bclose(item.span)?;
}
ast::ItemKind::TraitAlias(ref generics, ref bounds) => {
self.head("")?;
self.print_visibility(&item.vis)?;
self.word_nbsp("trait")?;
self.print_ident(item.ident)?;
self.print_generic_params(&generics.params)?;
let mut real_bounds = Vec::with_capacity(bounds.len());
// FIXME(durka) this seems to be some quite outdated syntax
for b in bounds.iter() {
if let GenericBound::Trait(ref ptr, ast::TraitBoundModifier::Maybe) = *b {
self.s.space()?;
self.word_space("for ?")?;
self.print_trait_ref(&ptr.trait_ref)?;
} else {
real_bounds.push(b.clone());
}
}
self.nbsp()?;
self.print_type_bounds("=", &real_bounds[..])?;
self.print_where_clause(&generics.where_clause)?;
self.s.word(";")?;
}
ast::ItemKind::Mac(ref mac) => {
if item.ident.name == keywords::Invalid.name() {
self.print_mac(mac)?;
match mac.node.delim {
MacDelimiter::Brace => {}
_ => self.s.word(";")?,
}
} else {
self.print_path(&mac.node.path, false, 0)?;
self.s.word("! ")?;
self.print_ident(item.ident)?;
self.cbox(INDENT_UNIT)?;
self.popen()?;
self.print_tts(mac.node.stream())?;
self.pclose()?;
self.s.word(";")?;
self.end()?;
}
}
ast::ItemKind::MacroDef(ref tts) => {
self.s.word("macro_rules! ")?;
self.print_ident(item.ident)?;
self.cbox(INDENT_UNIT)?;
self.popen()?;
self.print_tts(tts.stream())?;
self.pclose()?;
self.s.word(";")?;
self.end()?;
}
}
self.ann.post(self, AnnNode::Item(item))
}
fn print_trait_ref(&mut self, t: &ast::TraitRef) -> io::Result<()> {
self.print_path(&t.path, false, 0)
}
fn print_formal_generic_params(
&mut self,
generic_params: &[ast::GenericParam]
) -> io::Result<()> {
if !generic_params.is_empty() {
self.s.word("for")?;
self.print_generic_params(generic_params)?;
self.nbsp()?;
}
Ok(())
}
fn print_poly_trait_ref(&mut self, t: &ast::PolyTraitRef) -> io::Result<()> {
self.print_formal_generic_params(&t.bound_generic_params)?;
self.print_trait_ref(&t.trait_ref)
}
pub fn print_enum_def(&mut self, enum_definition: &ast::EnumDef,
generics: &ast::Generics, ident: ast::Ident,
span: syntax_pos::Span,
visibility: &ast::Visibility) -> io::Result<()> {
self.head(visibility_qualified(visibility, "enum"))?;
self.print_ident(ident)?;
self.print_generic_params(&generics.params)?;
self.print_where_clause(&generics.where_clause)?;
self.s.space()?;
self.print_variants(&enum_definition.variants, span)
}
pub fn print_variants(&mut self,
variants: &[ast::Variant],
span: syntax_pos::Span) -> io::Result<()> {
self.bopen()?;
for v in variants {
self.space_if_not_bol()?;
self.maybe_print_comment(v.span.lo())?;
self.print_outer_attributes(&v.node.attrs)?;
self.ibox(INDENT_UNIT)?;
self.print_variant(v)?;
self.s.word(",")?;
self.end()?;
self.maybe_print_trailing_comment(v.span, None)?;
}
self.bclose(span)
}
pub fn print_visibility(&mut self, vis: &ast::Visibility) -> io::Result<()> {
match vis.node {
ast::VisibilityKind::Public => self.word_nbsp("pub"),
ast::VisibilityKind::Crate(sugar) => match sugar {
ast::CrateSugar::PubCrate => self.word_nbsp("pub(crate)"),
ast::CrateSugar::JustCrate => self.word_nbsp("crate")
}
ast::VisibilityKind::Restricted { ref path, .. } => {
let path = to_string(|s| s.print_path(path, false, 0));
if path == "self" || path == "super" {
self.word_nbsp(format!("pub({})", path))
} else {
self.word_nbsp(format!("pub(in {})", path))
}
}
ast::VisibilityKind::Inherited => Ok(())
}
}
pub fn print_defaultness(&mut self, defaultness: ast::Defaultness) -> io::Result<()> {
if let ast::Defaultness::Default = defaultness {
self.word_nbsp("default")?;
}
Ok(())
}
pub fn print_struct(&mut self,
struct_def: &ast::VariantData,
generics: &ast::Generics,
ident: ast::Ident,
span: syntax_pos::Span,
print_finalizer: bool) -> io::Result<()> {
self.print_ident(ident)?;
self.print_generic_params(&generics.params)?;
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.s.word(";")?;
}
self.end()?;
self.end() // close the outer-box
}
ast::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.unwrap())?;
self.word_nbsp(":")?;
self.print_type(&field.ty)?;
self.s.word(",")?;
}
self.bclose(span)
}
}
}
pub fn print_variant(&mut self, v: &ast::Variant) -> io::Result<()> {
self.head("")?;
let generics = ast::Generics::default();
self.print_struct(&v.node.data, &generics, v.node.ident, v.span, false)?;
match v.node.disr_expr {
Some(ref d) => {
self.s.space()?;
self.word_space("=")?;
self.print_expr(&d.value)
}
_ => Ok(())
}
}
pub fn print_method_sig(&mut self,
ident: ast::Ident,
generics: &ast::Generics,
m: &ast::MethodSig,
vis: &ast::Visibility)
-> io::Result<()> {
self.print_fn(&m.decl,
m.header,
Some(ident),
&generics,
vis)
}
pub fn print_trait_item(&mut self, ti: &ast::TraitItem)
-> io::Result<()> {
self.ann.pre(self, AnnNode::SubItem(ti.id))?;
self.hardbreak_if_not_bol()?;
self.maybe_print_comment(ti.span.lo())?;
self.print_outer_attributes(&ti.attrs)?;
match ti.node {
ast::TraitItemKind::Const(ref ty, ref default) => {
self.print_associated_const(
ti.ident,
ty,
default.as_ref().map(|expr| &**expr),
&source_map::respan(ti.span.shrink_to_lo(), ast::VisibilityKind::Inherited),
)?;
}
ast::TraitItemKind::Method(ref sig, ref body) => {
if body.is_some() {
self.head("")?;
}
self.print_method_sig(
ti.ident,
&ti.generics,
sig,
&source_map::respan(ti.span.shrink_to_lo(), ast::VisibilityKind::Inherited),
)?;
if let Some(ref body) = *body {
self.nbsp()?;
self.print_block_with_attrs(body, &ti.attrs)?;
} else {
self.s.word(";")?;
}
}
ast::TraitItemKind::Type(ref bounds, ref default) => {
self.print_associated_type(ti.ident, Some(bounds),
default.as_ref().map(|ty| &**ty))?;
}
ast::TraitItemKind::Macro(ref mac) => {
self.print_mac(mac)?;
match mac.node.delim {
MacDelimiter::Brace => {}
_ => self.s.word(";")?,
}
}
}
self.ann.post(self, AnnNode::SubItem(ti.id))
}
pub fn print_impl_item(&mut self, ii: &ast::ImplItem) -> io::Result<()> {
self.ann.pre(self, AnnNode::SubItem(ii.id))?;
self.hardbreak_if_not_bol()?;
self.maybe_print_comment(ii.span.lo())?;
self.print_outer_attributes(&ii.attrs)?;
self.print_defaultness(ii.defaultness)?;
match ii.node {
ast::ImplItemKind::Const(ref ty, ref expr) => {
self.print_associated_const(ii.ident, ty, Some(expr), &ii.vis)?;
}
ast::ImplItemKind::Method(ref sig, ref body) => {
self.head("")?;
self.print_method_sig(ii.ident, &ii.generics, sig, &ii.vis)?;
self.nbsp()?;
self.print_block_with_attrs(body, &ii.attrs)?;
}
ast::ImplItemKind::Type(ref ty) => {
self.print_associated_type(ii.ident, None, Some(ty))?;
}
ast::ImplItemKind::Existential(ref bounds) => {
self.word_space("existential")?;
self.print_associated_type(ii.ident, Some(bounds), None)?;
}
ast::ImplItemKind::Macro(ref mac) => {
self.print_mac(mac)?;
match mac.node.delim {
MacDelimiter::Brace => {}
_ => self.s.word(";")?,
}
}
}
self.ann.post(self, AnnNode::SubItem(ii.id))
}
pub fn print_stmt(&mut self, st: &ast::Stmt) -> io::Result<()> {
self.maybe_print_comment(st.span.lo())?;
match st.node {
ast::StmtKind::Local(ref loc) => {
self.print_outer_attributes(&loc.attrs)?;
self.space_if_not_bol()?;
self.ibox(INDENT_UNIT)?;
self.word_nbsp("let")?;
self.ibox(INDENT_UNIT)?;
self.print_local_decl(loc)?;
self.end()?;
if let Some(ref init) = loc.init {
self.nbsp()?;
self.word_space("=")?;
self.print_expr(init)?;
}
self.s.word(";")?;
self.end()?;
}
ast::StmtKind::Item(ref item) => self.print_item(item)?,
ast::StmtKind::Expr(ref expr) => {
self.space_if_not_bol()?;
self.print_expr_outer_attr_style(expr, false)?;
if parse::classify::expr_requires_semi_to_be_stmt(expr) {
self.s.word(";")?;
}
}
ast::StmtKind::Semi(ref expr) => {
self.space_if_not_bol()?;
self.print_expr_outer_attr_style(expr, false)?;
self.s.word(";")?;
}
ast::StmtKind::Mac(ref mac) => {
let (ref mac, style, ref attrs) = **mac;
self.space_if_not_bol()?;
self.print_outer_attributes(attrs)?;
self.print_mac(mac)?;
if style == ast::MacStmtStyle::Semicolon {
self.s.word(";")?;
}
}
}
self.maybe_print_trailing_comment(st.span, None)
}
pub fn print_block(&mut self, blk: &ast::Block) -> io::Result<()> {
self.print_block_with_attrs(blk, &[])
}
pub fn print_block_unclosed(&mut self, blk: &ast::Block) -> io::Result<()> {
self.print_block_unclosed_indent(blk, INDENT_UNIT)
}
pub fn print_block_unclosed_with_attrs(&mut self, blk: &ast::Block,
attrs: &[ast::Attribute])
-> io::Result<()> {
self.print_block_maybe_unclosed(blk, INDENT_UNIT, attrs, false)
}
pub fn print_block_unclosed_indent(&mut self, blk: &ast::Block,
indented: usize) -> io::Result<()> {
self.print_block_maybe_unclosed(blk, indented, &[], false)
}
pub fn print_block_with_attrs(&mut self,
blk: &ast::Block,
attrs: &[ast::Attribute]) -> io::Result<()> {
self.print_block_maybe_unclosed(blk, INDENT_UNIT, attrs, true)
}
pub fn print_block_maybe_unclosed(&mut self,
blk: &ast::Block,
indented: usize,
attrs: &[ast::Attribute],
close_box: bool) -> io::Result<()> {
match blk.rules {
BlockCheckMode::Unsafe(..) => self.word_space("unsafe")?,
BlockCheckMode::Default => ()
}
self.maybe_print_comment(blk.span.lo())?;
self.ann.pre(self, AnnNode::Block(blk))?;
self.bopen()?;
self.print_inner_attributes(attrs)?;
for (i, st) in blk.stmts.iter().enumerate() {
match st.node {
ast::StmtKind::Expr(ref expr) if i == blk.stmts.len() - 1 => {
self.maybe_print_comment(st.span.lo())?;
self.space_if_not_bol()?;
self.print_expr_outer_attr_style(expr, false)?;
self.maybe_print_trailing_comment(expr.span, Some(blk.span.hi()))?;
}
_ => self.print_stmt(st)?,
}
}
self.bclose_maybe_open(blk.span, indented, close_box)?;
self.ann.post(self, AnnNode::Block(blk))
}
fn print_else(&mut self, els: Option<&ast::Expr>) -> io::Result<()> {
match els {
Some(_else) => {
match _else.node {
// "another else-if"
ast::ExprKind::If(ref i, ref then, ref e) => {
self.cbox(INDENT_UNIT - 1)?;
self.ibox(0)?;
self.s.word(" else if ")?;
self.print_expr_as_cond(i)?;
self.s.space()?;
self.print_block(then)?;
self.print_else(e.as_ref().map(|e| &**e))
}
// "another else-if-let"
ast::ExprKind::IfLet(ref pats, ref expr, ref then, ref e) => {
self.cbox(INDENT_UNIT - 1)?;
self.ibox(0)?;
self.s.word(" else if let ")?;
self.print_pats(pats)?;
self.s.space()?;
self.word_space("=")?;
self.print_expr_as_cond(expr)?;
self.s.space()?;
self.print_block(then)?;
self.print_else(e.as_ref().map(|e| &**e))
}
// "final else"
ast::ExprKind::Block(ref b, _) => {
self.cbox(INDENT_UNIT - 1)?;
self.ibox(0)?;
self.s.word(" else ")?;
self.print_block(b)
}
// BLEAH, constraints would be great here
_ => {
panic!("print_if saw if with weird alternative");
}
}
}
_ => Ok(())
}
}
pub fn print_if(&mut self, test: &ast::Expr, blk: &ast::Block,
elseopt: Option<&ast::Expr>) -> io::Result<()> {
self.head("if")?;
self.print_expr_as_cond(test)?;
self.s.space()?;
self.print_block(blk)?;
self.print_else(elseopt)
}
pub fn print_if_let(&mut self, pats: &[P<ast::Pat>], expr: &ast::Expr, blk: &ast::Block,
elseopt: Option<&ast::Expr>) -> io::Result<()> {
self.head("if let")?;
self.print_pats(pats)?;
self.s.space()?;
self.word_space("=")?;
self.print_expr_as_cond(expr)?;
self.s.space()?;
self.print_block(blk)?;
self.print_else(elseopt)
}
pub fn print_mac(&mut self, m: &ast::Mac) -> io::Result<()> {
self.print_path(&m.node.path, false, 0)?;
self.s.word("!")?;
match m.node.delim {
MacDelimiter::Parenthesis => self.popen()?,
MacDelimiter::Bracket => self.s.word("[")?,
MacDelimiter::Brace => {
self.head("")?;
self.bopen()?;
}
}
self.print_tts(m.node.stream())?;
match m.node.delim {
MacDelimiter::Parenthesis => self.pclose(),
MacDelimiter::Bracket => self.s.word("]"),
MacDelimiter::Brace => self.bclose(m.span),
}
}
fn print_call_post(&mut self, args: &[P<ast::Expr>]) -> io::Result<()> {
self.popen()?;
self.commasep_exprs(Inconsistent, args)?;
self.pclose()
}
pub fn print_expr_maybe_paren(&mut self, expr: &ast::Expr, prec: i8) -> io::Result<()> {
let needs_par = expr.precedence().order() < prec;
if needs_par {
self.popen()?;
}
self.print_expr(expr)?;
if needs_par {
self.pclose()?;
}
Ok(())
}
/// Print an expr using syntax that's acceptable in a condition position, such as the `cond` in
/// `if cond { ... }`.
pub fn print_expr_as_cond(&mut self, expr: &ast::Expr) -> io::Result<()> {
let needs_par = match expr.node {
// These cases need parens due to the parse error observed in #26461: `if return {}`
// parses as the erroneous construct `if (return {})`, not `if (return) {}`.
ast::ExprKind::Closure(..) |
ast::ExprKind::Ret(..) |
ast::ExprKind::Break(..) => true,
_ => parser::contains_exterior_struct_lit(expr),
};
if needs_par {
self.popen()?;
}
self.print_expr(expr)?;
if needs_par {
self.pclose()?;
}
Ok(())
}
fn print_expr_vec(&mut self, exprs: &[P<ast::Expr>],
attrs: &[Attribute]) -> io::Result<()> {
self.ibox(INDENT_UNIT)?;
self.s.word("[")?;
self.print_inner_attributes_inline(attrs)?;
self.commasep_exprs(Inconsistent, &exprs[..])?;
self.s.word("]")?;
self.end()
}
fn print_expr_repeat(&mut self,
element: &ast::Expr,
count: &ast::AnonConst,
attrs: &[Attribute]) -> io::Result<()> {
self.ibox(INDENT_UNIT)?;
self.s.word("[")?;
self.print_inner_attributes_inline(attrs)?;
self.print_expr(element)?;
self.word_space(";")?;
self.print_expr(&count.value)?;
self.s.word("]")?;
self.end()
}
fn print_expr_struct(&mut self,
path: &ast::Path,
fields: &[ast::Field],
wth: &Option<P<ast::Expr>>,
attrs: &[Attribute]) -> io::Result<()> {
self.print_path(path, true, 0)?;
self.s.word("{")?;
self.print_inner_attributes_inline(attrs)?;
self.commasep_cmnt(
Consistent,
&fields[..],
|s, field| {
s.ibox(INDENT_UNIT)?;
if !field.is_shorthand {
s.print_ident(field.ident)?;
s.word_space(":")?;
}
s.print_expr(&field.expr)?;
s.end()
},
|f| f.span)?;
match *wth {
Some(ref expr) => {
self.ibox(INDENT_UNIT)?;
if !fields.is_empty() {
self.s.word(",")?;
self.s.space()?;
}
self.s.word("..")?;
self.print_expr(expr)?;
self.end()?;
}
_ => if !fields.is_empty() {
self.s.word(",")?
}
}
self.s.word("}")?;
Ok(())
}
fn print_expr_tup(&mut self, exprs: &[P<ast::Expr>],
attrs: &[Attribute]) -> io::Result<()> {
self.popen()?;
self.print_inner_attributes_inline(attrs)?;
self.commasep_exprs(Inconsistent, &exprs[..])?;
if exprs.len() == 1 {
self.s.word(",")?;
}
self.pclose()
}
fn print_expr_call(&mut self,
func: &ast::Expr,
args: &[P<ast::Expr>]) -> io::Result<()> {
let prec =
match func.node {
ast::ExprKind::Field(..) => parser::PREC_FORCE_PAREN,
_ => parser::PREC_POSTFIX,
};
self.print_expr_maybe_paren(func, prec)?;
self.print_call_post(args)
}
fn print_expr_method_call(&mut self,
segment: &ast::PathSegment,
args: &[P<ast::Expr>]) -> io::Result<()> {
let base_args = &args[1..];
self.print_expr_maybe_paren(&args[0], parser::PREC_POSTFIX)?;
self.s.word(".")?;
self.print_ident(segment.ident)?;
if let Some(ref args) = segment.args {
self.print_generic_args(args, true)?;
}
self.print_call_post(base_args)
}
fn print_expr_binary(&mut self,
op: ast::BinOp,
lhs: &ast::Expr,
rhs: &ast::Expr) -> io::Result<()> {
let assoc_op = AssocOp::from_ast_binop(op.node);
let prec = assoc_op.precedence() as i8;
let fixity = assoc_op.fixity();
let (left_prec, right_prec) = match fixity {
Fixity::Left => (prec, prec + 1),
Fixity::Right => (prec + 1, prec),
Fixity::None => (prec + 1, prec + 1),
};
let left_prec = match (&lhs.node, op.node) {
// These cases need parens: `x as i32 < y` has the parser thinking that `i32 < y` is
// the beginning of a path type. It starts trying to parse `x as (i32 < y ...` instead
// of `(x as i32) < ...`. We need to convince it _not_ to do that.
(&ast::ExprKind::Cast { .. }, ast::BinOpKind::Lt) |
(&ast::ExprKind::Cast { .. }, ast::BinOpKind::Shl) => parser::PREC_FORCE_PAREN,
_ => left_prec,
};
self.print_expr_maybe_paren(lhs, left_prec)?;
self.s.space()?;
self.word_space(op.node.to_string())?;
self.print_expr_maybe_paren(rhs, right_prec)
}
fn print_expr_unary(&mut self,
op: ast::UnOp,
expr: &ast::Expr) -> io::Result<()> {
self.s.word(ast::UnOp::to_string(op))?;
self.print_expr_maybe_paren(expr, parser::PREC_PREFIX)
}
fn print_expr_addr_of(&mut self,
mutability: ast::Mutability,
expr: &ast::Expr) -> io::Result<()> {
self.s.word("&")?;
self.print_mutability(mutability)?;
self.print_expr_maybe_paren(expr, parser::PREC_PREFIX)
}
pub fn print_expr(&mut self, expr: &ast::Expr) -> io::Result<()> {
self.print_expr_outer_attr_style(expr, true)
}
fn print_expr_outer_attr_style(&mut self,
expr: &ast::Expr,
is_inline: bool) -> io::Result<()> {
self.maybe_print_comment(expr.span.lo())?;
let attrs = &expr.attrs;
if is_inline {
self.print_outer_attributes_inline(attrs)?;
} else {
self.print_outer_attributes(attrs)?;
}
self.ibox(INDENT_UNIT)?;
self.ann.pre(self, AnnNode::Expr(expr))?;
match expr.node {
ast::ExprKind::Box(ref expr) => {
self.word_space("box")?;
self.print_expr_maybe_paren(expr, parser::PREC_PREFIX)?;
}
ast::ExprKind::ObsoleteInPlace(ref place, ref expr) => {
let prec = AssocOp::ObsoleteInPlace.precedence() as i8;
self.print_expr_maybe_paren(place, prec + 1)?;
self.s.space()?;
self.word_space("<-")?;
self.print_expr_maybe_paren(expr, prec)?;
}
ast::ExprKind::Array(ref exprs) => {
self.print_expr_vec(&exprs[..], attrs)?;
}
ast::ExprKind::Repeat(ref element, ref count) => {
self.print_expr_repeat(element, count, attrs)?;
}
ast::ExprKind::Struct(ref path, ref fields, ref wth) => {
self.print_expr_struct(path, &fields[..], wth, attrs)?;
}
ast::ExprKind::Tup(ref exprs) => {
self.print_expr_tup(&exprs[..], attrs)?;
}
ast::ExprKind::Call(ref func, ref args) => {
self.print_expr_call(func, &args[..])?;
}
ast::ExprKind::MethodCall(ref segment, ref args) => {
self.print_expr_method_call(segment, &args[..])?;
}
ast::ExprKind::Binary(op, ref lhs, ref rhs) => {
self.print_expr_binary(op, lhs, rhs)?;
}
ast::ExprKind::Unary(op, ref expr) => {
self.print_expr_unary(op, expr)?;
}
ast::ExprKind::AddrOf(m, ref expr) => {
self.print_expr_addr_of(m, expr)?;
}
ast::ExprKind::Lit(ref lit) => {
self.print_literal(lit)?;
}
ast::ExprKind::Cast(ref expr, ref ty) => {
let prec = AssocOp::As.precedence() as i8;
self.print_expr_maybe_paren(expr, prec)?;
self.s.space()?;
self.word_space("as")?;
self.print_type(ty)?;
}
ast::ExprKind::Type(ref expr, ref ty) => {
let prec = AssocOp::Colon.precedence() as i8;
self.print_expr_maybe_paren(expr, prec)?;
self.word_space(":")?;
self.print_type(ty)?;
}
ast::ExprKind::If(ref test, ref blk, ref elseopt) => {
self.print_if(test, blk, elseopt.as_ref().map(|e| &**e))?;
}
ast::ExprKind::IfLet(ref pats, ref expr, ref blk, ref elseopt) => {
self.print_if_let(pats, expr, blk, elseopt.as_ref().map(|e| &**e))?;
}
ast::ExprKind::While(ref test, ref blk, opt_label) => {
if let Some(label) = opt_label {
self.print_ident(label.ident)?;
self.word_space(":")?;
}
self.head("while")?;
self.print_expr_as_cond(test)?;
self.s.space()?;
self.print_block_with_attrs(blk, attrs)?;
}
ast::ExprKind::WhileLet(ref pats, ref expr, ref blk, opt_label) => {
if let Some(label) = opt_label {
self.print_ident(label.ident)?;
self.word_space(":")?;
}
self.head("while let")?;
self.print_pats(pats)?;
self.s.space()?;
self.word_space("=")?;
self.print_expr_as_cond(expr)?;
self.s.space()?;
self.print_block_with_attrs(blk, attrs)?;
}
ast::ExprKind::ForLoop(ref pat, ref iter, ref blk, opt_label) => {
if let Some(label) = opt_label {
self.print_ident(label.ident)?;
self.word_space(":")?;
}
self.head("for")?;
self.print_pat(pat)?;
self.s.space()?;
self.word_space("in")?;
self.print_expr_as_cond(iter)?;
self.s.space()?;
self.print_block_with_attrs(blk, attrs)?;
}
ast::ExprKind::Loop(ref blk, opt_label) => {
if let Some(label) = opt_label {
self.print_ident(label.ident)?;
self.word_space(":")?;
}
self.head("loop")?;
self.s.space()?;
self.print_block_with_attrs(blk, attrs)?;
}
ast::ExprKind::Match(ref expr, ref arms) => {
self.cbox(INDENT_UNIT)?;
self.ibox(4)?;
self.word_nbsp("match")?;
self.print_expr_as_cond(expr)?;
self.s.space()?;
self.bopen()?;
self.print_inner_attributes_no_trailing_hardbreak(attrs)?;
for arm in arms {
self.print_arm(arm)?;
}
self.bclose_(expr.span, INDENT_UNIT)?;
}
ast::ExprKind::Closure(
capture_clause, asyncness, movability, ref decl, ref body, _) => {
self.print_movability(movability)?;
self.print_asyncness(asyncness)?;
self.print_capture_clause(capture_clause)?;
self.print_fn_block_args(decl)?;
self.s.space()?;
self.print_expr(body)?;
self.end()?; // need to close a box
// a box will be closed by print_expr, but we didn't want an overall
// wrapper so we closed the corresponding opening. so create an
// empty box to satisfy the close.
self.ibox(0)?;
}
ast::ExprKind::Block(ref blk, opt_label) => {
if let Some(label) = opt_label {
self.print_ident(label.ident)?;
self.word_space(":")?;
}
// containing cbox, will be closed by print-block at }
self.cbox(INDENT_UNIT)?;
// head-box, will be closed by print-block after {
self.ibox(0)?;
self.print_block_with_attrs(blk, attrs)?;
}
ast::ExprKind::Async(capture_clause, _, ref blk) => {
self.word_nbsp("async")?;
self.print_capture_clause(capture_clause)?;
self.s.space()?;
// 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::Assign(ref lhs, ref rhs) => {
let prec = AssocOp::Assign.precedence() as i8;
self.print_expr_maybe_paren(lhs, prec + 1)?;
self.s.space()?;
self.word_space("=")?;
self.print_expr_maybe_paren(rhs, prec)?;
}
ast::ExprKind::AssignOp(op, ref lhs, ref rhs) => {
let prec = AssocOp::Assign.precedence() as i8;
self.print_expr_maybe_paren(lhs, prec + 1)?;
self.s.space()?;
self.s.word(op.node.to_string())?;
self.word_space("=")?;
self.print_expr_maybe_paren(rhs, prec)?;
}
ast::ExprKind::Field(ref expr, ident) => {
self.print_expr_maybe_paren(expr, parser::PREC_POSTFIX)?;
self.s.word(".")?;
self.print_ident(ident)?;
}
ast::ExprKind::Index(ref expr, ref index) => {
self.print_expr_maybe_paren(expr, parser::PREC_POSTFIX)?;
self.s.word("[")?;
self.print_expr(index)?;
self.s.word("]")?;
}
ast::ExprKind::Range(ref start, ref end, limits) => {
// Special case for `Range`. `AssocOp` claims that `Range` has higher precedence
// than `Assign`, but `x .. x = x` gives a parse error instead of `x .. (x = x)`.
// Here we use a fake precedence value so that any child with lower precedence than
// a "normal" binop gets parenthesized. (`LOr` is the lowest-precedence binop.)
let fake_prec = AssocOp::LOr.precedence() as i8;
if let Some(ref e) = *start {
self.print_expr_maybe_paren(e, fake_prec)?;
}
if limits == ast::RangeLimits::HalfOpen {
self.s.word("..")?;
} else {
self.s.word("..=")?;
}
if let Some(ref e) = *end {
self.print_expr_maybe_paren(e, fake_prec)?;
}
}
ast::ExprKind::Path(None, ref path) => {
self.print_path(path, true, 0)?
}
ast::ExprKind::Path(Some(ref qself), ref path) => {
self.print_qpath(path, qself, true)?
}
ast::ExprKind::Break(opt_label, ref opt_expr) => {
self.s.word("break")?;
self.s.space()?;
if let Some(label) = opt_label {
self.print_ident(label.ident)?;
self.s.space()?;
}
if let Some(ref expr) = *opt_expr {
self.print_expr_maybe_paren(expr, parser::PREC_JUMP)?;
self.s.space()?;
}
}
ast::ExprKind::Continue(opt_label) => {
self.s.word("continue")?;
self.s.space()?;
if let Some(label) = opt_label {
self.print_ident(label.ident)?;
self.s.space()?
}
}
ast::ExprKind::Ret(ref result) => {
self.s.word("return")?;
if let Some(ref expr) = *result {
self.s.word(" ")?;
self.print_expr_maybe_paren(expr, parser::PREC_JUMP)?;
}
}
ast::ExprKind::InlineAsm(ref a) => {
self.s.word("asm!")?;
self.popen()?;
self.print_string(&a.asm.as_str(), a.asm_str_style)?;
self.word_space(":")?;
self.commasep(Inconsistent, &a.outputs, |s, out| {
let constraint = out.constraint.as_str();
let mut ch = constraint.chars();
match ch.next() {
Some('=') if out.is_rw => {
s.print_string(&format!("+{}", ch.as_str()),
ast::StrStyle::Cooked)?
}
_ => s.print_string(&constraint, ast::StrStyle::Cooked)?
}
s.popen()?;
s.print_expr(&out.expr)?;
s.pclose()?;
Ok(())
})?;
self.s.space()?;
self.word_space(":")?;
self.commasep(Inconsistent, &a.inputs, |s, &(co, ref o)| {
s.print_string(&co.as_str(), ast::StrStyle::Cooked)?;
s.popen()?;
s.print_expr(o)?;
s.pclose()?;
Ok(())
})?;
self.s.space()?;
self.word_space(":")?;
self.commasep(Inconsistent, &a.clobbers,
|s, co| {
s.print_string(&co.as_str(), ast::StrStyle::Cooked)?;
Ok(())
})?;
let mut options = vec![];
if a.volatile {
options.push("volatile");
}
if a.alignstack {
options.push("alignstack");
}
if a.dialect == ast::AsmDialect::Intel {
options.push("intel");
}
if !options.is_empty() {
self.s.space()?;
self.word_space(":")?;
self.commasep(Inconsistent, &options,
|s, &co| {
s.print_string(co, ast::StrStyle::Cooked)?;
Ok(())
})?;
}
self.pclose()?;
}
ast::ExprKind::Mac(ref m) => self.print_mac(m)?,
ast::ExprKind::Paren(ref e) => {
self.popen()?;
self.print_inner_attributes_inline(attrs)?;
self.print_expr(e)?;
self.pclose()?;
},
ast::ExprKind::Yield(ref e) => {
self.s.word("yield")?;
match *e {
Some(ref expr) => {
self.s.space()?;
self.print_expr_maybe_paren(expr, parser::PREC_JUMP)?;
}
_ => ()
}
}
ast::ExprKind::Try(ref e) => {
self.print_expr_maybe_paren(e, parser::PREC_POSTFIX)?;
self.s.word("?")?
}
ast::ExprKind::TryBlock(ref blk) => {
self.head("try")?;
self.s.space()?;
self.print_block_with_attrs(blk, attrs)?
}
ast::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: &ast::Local) -> io::Result<()> {
self.print_pat(&loc.pat)?;
if let Some(ref ty) = loc.ty {
self.word_space(":")?;
self.print_type(ty)?;
}
Ok(())
}
pub fn print_ident(&mut self, ident: ast::Ident) -> io::Result<()> {
if ident.is_raw_guess() {
self.s.word(format!("r#{}", ident))?;
} else {
self.s.word(ident.as_str().get())?;
}
self.ann.post(self, AnnNode::Ident(&ident))
}
pub fn print_usize(&mut self, i: usize) -> io::Result<()> {
self.s.word(i.to_string())
}
pub fn print_name(&mut self, name: ast::Name) -> io::Result<()> {
self.s.word(name.as_str().get())?;
self.ann.post(self, AnnNode::Name(&name))
}
pub fn print_for_decl(&mut self, loc: &ast::Local,
coll: &ast::Expr) -> io::Result<()> {
self.print_local_decl(loc)?;
self.s.space()?;
self.word_space("in")?;
self.print_expr(coll)
}
fn print_path(&mut self,
path: &ast::Path,
colons_before_params: bool,
depth: usize)
-> io::Result<()>
{
self.maybe_print_comment(path.span.lo())?;
for (i, segment) in path.segments[..path.segments.len() - depth].iter().enumerate() {
if i > 0 {
self.s.word("::")?
}
self.print_path_segment(segment, colons_before_params)?;
}
Ok(())
}
fn print_path_segment(&mut self,
segment: &ast::PathSegment,
colons_before_params: bool)
-> io::Result<()>
{
if segment.ident.name != keywords::PathRoot.name() {
if segment.ident.name == keywords::DollarCrate.name() {
self.print_dollar_crate(segment.ident)?;
} else {
self.print_ident(segment.ident)?;
}
if let Some(ref args) = segment.args {
self.print_generic_args(args, colons_before_params)?;
}
}
Ok(())
}
fn print_qpath(&mut self,
path: &ast::Path,
qself: &ast::QSelf,
colons_before_params: bool)
-> io::Result<()>
{
self.s.word("<")?;
self.print_type(&qself.ty)?;
if qself.position > 0 {
self.s.space()?;
self.word_space("as")?;
let depth = path.segments.len() - qself.position;
self.print_path(path, false, depth)?;
}
self.s.word(">")?;
self.s.word("::")?;
let item_segment = path.segments.last().unwrap();
self.print_ident(item_segment.ident)?;
match item_segment.args {
Some(ref args) => self.print_generic_args(args, colons_before_params),
None => Ok(()),
}
}
fn print_generic_args(&mut self,
args: &ast::GenericArgs,
colons_before_params: bool)
-> io::Result<()>
{
if colons_before_params {
self.s.word("::")?
}
match *args {
ast::GenericArgs::AngleBracketed(ref data) => {
self.s.word("<")?;
self.commasep(Inconsistent, &data.args, |s, generic_arg| {
s.print_generic_arg(generic_arg)
})?;
let mut comma = data.args.len() != 0;
for binding in data.bindings.iter() {
if comma {
self.word_space(",")?
}
self.print_ident(binding.ident)?;
self.s.space()?;
self.word_space("=")?;
self.print_type(&binding.ty)?;
comma = true;
}
self.s.word(">")?
}
ast::GenericArgs::Parenthesized(ref data) => {
self.s.word("(")?;
self.commasep(
Inconsistent,
&data.inputs,
|s, ty| s.print_type(ty))?;
self.s.word(")")?;
if let Some(ref ty) = data.output {
self.space_if_not_bol()?;
self.word_space("->")?;
self.print_type(ty)?;
}
}
}
Ok(())
}
pub fn print_pat(&mut self, pat: &ast::Pat) -> io::Result<()> {
self.maybe_print_comment(pat.span.lo())?;
self.ann.pre(self, 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::Ident(binding_mode, ident, ref sub) => {
match binding_mode {
ast::BindingMode::ByRef(mutbl) => {
self.word_nbsp("ref")?;
self.print_mutability(mutbl)?;
}
ast::BindingMode::ByValue(ast::Mutability::Immutable) => {}
ast::BindingMode::ByValue(ast::Mutability::Mutable) => {
self.word_nbsp("mut")?;
}
}
self.print_ident(ident)?;
if let Some(ref p) = *sub {
self.s.word("@")?;
self.print_pat(p)?;
}
}
PatKind::TupleStruct(ref path, ref elts, ddpos) => {
self.print_path(path, true, 0)?;
self.popen()?;
if let Some(ddpos) = ddpos {
self.commasep(Inconsistent, &elts[..ddpos], |s, p| s.print_pat(p))?;
if ddpos != 0 {
self.word_space(",")?;
}
self.s.word("..")?;
if ddpos != elts.len() {
self.s.word(",")?;
self.commasep(Inconsistent, &elts[ddpos..], |s, p| s.print_pat(p))?;
}
} else {
self.commasep(Inconsistent, &elts[..], |s, p| s.print_pat(p))?;
}
self.pclose()?;
}
PatKind::Path(None, ref path) => {
self.print_path(path, true, 0)?;
}
PatKind::Path(Some(ref qself), ref path) => {
self.print_qpath(path, qself, false)?;
}
PatKind::Struct(ref path, ref fields, etc) => {
self.print_path(path, true, 0)?;
self.nbsp()?;
self.word_space("{")?;
self.commasep_cmnt(
Consistent, &fields[..],
|s, f| {
s.cbox(INDENT_UNIT)?;
if !f.node.is_shorthand {
s.print_ident(f.node.ident)?;
s.word_nbsp(":")?;
}
s.print_pat(&f.node.pat)?;
s.end()
},
|f| f.node.pat.span)?;
if etc {
if !fields.is_empty() { self.word_space(",")?; }
self.s.word("..")?;
}
self.s.space()?;
self.s.word("}")?;
}
PatKind::Tuple(ref elts, ddpos) => {
self.popen()?;
if let Some(ddpos) = ddpos {
self.commasep(Inconsistent, &elts[..ddpos], |s, p| s.print_pat(p))?;
if ddpos != 0 {
self.word_space(",")?;
}
self.s.word("..")?;
if ddpos != elts.len() {
self.s.word(",")?;
self.commasep(Inconsistent, &elts[ddpos..], |s, p| s.print_pat(p))?;
}
} else {
self.commasep(Inconsistent, &elts[..], |s, p| s.print_pat(p))?;
if elts.len() == 1 {
self.s.word(",")?;
}
}
self.pclose()?;
}
PatKind::Box(ref inner) => {
self.s.word("box ")?;
self.print_pat(inner)?;
}
PatKind::Ref(ref inner, mutbl) => {
self.s.word("&")?;
if mutbl == ast::Mutability::Mutable {
self.s.word("mut ")?;
}
self.print_pat(inner)?;
}
PatKind::Lit(ref e) => self.print_expr(&**e)?,
PatKind::Range(ref begin, ref end, Spanned { node: ref end_kind, .. }) => {
self.print_expr(begin)?;
self.s.space()?;
match *end_kind {
RangeEnd::Included(RangeSyntax::DotDotDot) => self.s.word("...")?,
RangeEnd::Included(RangeSyntax::DotDotEq) => self.s.word("..=")?,
RangeEnd::Excluded => self.s.word("..")?,
}
self.print_expr(end)?;
}
PatKind::Slice(ref before, ref slice, ref after) => {
self.s.word("[")?;
self.commasep(Inconsistent,
&before[..],
|s, p| s.print_pat(p))?;
if let Some(ref p) = *slice {
if !before.is_empty() { self.word_space(",")?; }
if let PatKind::Wild = p.node {
// Print nothing
} else {
self.print_pat(p)?;
}
self.s.word("..")?;
if !after.is_empty() { self.word_space(",")?; }
}
self.commasep(Inconsistent,
&after[..],
|s, p| s.print_pat(p))?;
self.s.word("]")?;
}
PatKind::Paren(ref inner) => {
self.popen()?;
self.print_pat(inner)?;
self.pclose()?;
}
PatKind::Mac(ref m) => self.print_mac(m)?,
}
self.ann.post(self, AnnNode::Pat(pat))
}
fn print_pats(&mut self, pats: &[P<ast::Pat>]) -> io::Result<()> {
let mut first = true;
for p in pats {
if first {
first = false;
} else {
self.s.space()?;
self.word_space("|")?;
}
self.print_pat(p)?;
}
Ok(())
}
fn print_arm(&mut self, arm: &ast::Arm) -> io::Result<()> {
// I have no idea why this check is necessary, but here it
// is :(
if arm.attrs.is_empty() {
self.s.space()?;
}
self.cbox(INDENT_UNIT)?;
self.ibox(0)?;
self.maybe_print_comment(arm.pats[0].span.lo())?;
self.print_outer_attributes(&arm.attrs)?;
self.print_pats(&arm.pats)?;
self.s.space()?;
if let Some(ref g) = arm.guard {
match g {
ast::Guard::If(ref e) => {
self.word_space("if")?;
self.print_expr(e)?;
self.s.space()?;
}
}
}
self.word_space("=>")?;
match arm.body.node {
ast::ExprKind::Block(ref blk, opt_label) => {
if let Some(label) = opt_label {
self.print_ident(label.ident)?;
self.word_space(":")?;
}
// the block will close the pattern's ibox
self.print_block_unclosed_indent(blk, INDENT_UNIT)?;
// If it is a user-provided unsafe block, print a comma after it
if let BlockCheckMode::Unsafe(ast::UserProvided) = blk.rules {
self.s.word(",")?;
}
}
_ => {
self.end()?; // close the ibox for the pattern
self.print_expr(&arm.body)?;
self.s.word(",")?;
}
}
self.end() // close enclosing cbox
}
fn print_explicit_self(&mut self, explicit_self: &ast::ExplicitSelf) -> io::Result<()> {
match explicit_self.node {
SelfKind::Value(m) => {
self.print_mutability(m)?;
self.s.word("self")
}
SelfKind::Region(ref lt, m) => {
self.s.word("&")?;
self.print_opt_lifetime(lt)?;
self.print_mutability(m)?;
self.s.word("self")
}
SelfKind::Explicit(ref typ, m) => {
self.print_mutability(m)?;
self.s.word("self")?;
self.word_space(":")?;
self.print_type(typ)
}
}
}
pub fn print_fn(&mut self,
decl: &ast::FnDecl,
header: ast::FnHeader,
name: Option<ast::Ident>,
generics: &ast::Generics,
vis: &ast::Visibility) -> io::Result<()> {
self.print_fn_header_info(header, vis)?;
if let Some(name) = name {
self.nbsp()?;
self.print_ident(name)?;
}
self.print_generic_params(&generics.params)?;
self.print_fn_args_and_ret(decl)?;
self.print_where_clause(&generics.where_clause)
}
pub fn print_fn_args_and_ret(&mut self, decl: &ast::FnDecl)
-> io::Result<()> {
self.popen()?;
self.commasep(Inconsistent, &decl.inputs, |s, arg| s.print_arg(arg, false))?;
self.pclose()?;
self.print_fn_output(decl)
}
pub fn print_fn_block_args(
&mut self,
decl: &ast::FnDecl)
-> io::Result<()> {
self.s.word("|")?;
self.commasep(Inconsistent, &decl.inputs, |s, arg| s.print_arg(arg, true))?;
self.s.word("|")?;
if let ast::FunctionRetTy::Default(..) = decl.output {
return Ok(());
}
self.space_if_not_bol()?;
self.word_space("->")?;
match decl.output {
ast::FunctionRetTy::Ty(ref ty) => {
self.print_type(ty)?;
self.maybe_print_comment(ty.span.lo())
}
ast::FunctionRetTy::Default(..) => unreachable!(),
}
}
pub fn print_movability(&mut self, movability: ast::Movability)
-> io::Result<()> {
match movability {
ast::Movability::Static => self.word_space("static"),
ast::Movability::Movable => Ok(()),
}
}
pub fn print_asyncness(&mut self, asyncness: ast::IsAsync)
-> io::Result<()> {
if asyncness.is_async() {
self.word_nbsp("async")?;
}
Ok(())
}
pub fn print_capture_clause(&mut self, capture_clause: ast::CaptureBy)
-> io::Result<()> {
match capture_clause {
ast::CaptureBy::Value => self.word_space("move"),
ast::CaptureBy::Ref => Ok(()),
}
}
pub fn print_type_bounds(&mut self, prefix: &'static str, bounds: &[ast::GenericBound])
-> io::Result<()> {
if !bounds.is_empty() {
self.s.word(prefix)?;
let mut first = true;
for bound in bounds {
if !(first && prefix.is_empty()) {
self.nbsp()?;
}
if first {
first = false;
} else {
self.word_space("+")?;
}
match bound {
GenericBound::Trait(tref, modifier) => {
if modifier == &TraitBoundModifier::Maybe {
self.s.word("?")?;
}
self.print_poly_trait_ref(tref)?;
}
GenericBound::Outlives(lt) => self.print_lifetime(*lt)?,
}
}
}
Ok(())
}
pub fn print_lifetime(&mut self, lifetime: ast::Lifetime) -> io::Result<()> {
self.print_name(lifetime.ident.name)
}
pub fn print_lifetime_bounds(&mut self, lifetime: ast::Lifetime, bounds: &ast::GenericBounds)
-> io::Result<()>
{
self.print_lifetime(lifetime)?;
if !bounds.is_empty() {
self.s.word(": ")?;
for (i, bound) in bounds.iter().enumerate() {
if i != 0 {
self.s.word(" + ")?;
}
match bound {
ast::GenericBound::Outlives(lt) => self.print_lifetime(*lt)?,
_ => panic!(),
}
}
}
Ok(())
}
pub fn print_generic_params(
&mut self,
generic_params: &[ast::GenericParam]
) -> io::Result<()> {
if generic_params.is_empty() {
return Ok(());
}
self.s.word("<")?;
self.commasep(Inconsistent, &generic_params, |s, param| {
match param.kind {
ast::GenericParamKind::Lifetime => {
s.print_outer_attributes_inline(&param.attrs)?;
let lt = ast::Lifetime { id: param.id, ident: param.ident };
s.print_lifetime_bounds(lt, &param.bounds)
}
ast::GenericParamKind::Type { ref default } => {
s.print_outer_attributes_inline(&param.attrs)?;
s.print_ident(param.ident)?;
s.print_type_bounds(":", &param.bounds)?;
match default {
Some(ref default) => {
s.s.space()?;
s.word_space("=")?;
s.print_type(default)
}
_ => Ok(())
}
}
ast::GenericParamKind::Const { ref ty } => {
s.print_outer_attributes_inline(&param.attrs)?;
s.word_space("const")?;
s.print_ident(param.ident)?;
s.s.space()?;
s.word_space(":")?;
s.print_type(ty)?;
s.print_type_bounds(":", &param.bounds)
}
}
})?;
self.s.word(">")?;
Ok(())
}
pub fn print_where_clause(&mut self, where_clause: &ast::WhereClause)
-> io::Result<()> {
if where_clause.predicates.is_empty() {
return Ok(())
}
self.s.space()?;
self.word_space("where")?;
for (i, predicate) in where_clause.predicates.iter().enumerate() {
if i != 0 {
self.word_space(",")?;
}
match *predicate {
ast::WherePredicate::BoundPredicate(ast::WhereBoundPredicate {
ref bound_generic_params,
ref bounded_ty,
ref bounds,
..
}) => {
self.print_formal_generic_params(bound_generic_params)?;
self.print_type(bounded_ty)?;
self.print_type_bounds(":", bounds)?;
}
ast::WherePredicate::RegionPredicate(ast::WhereRegionPredicate{ref lifetime,
ref bounds,
..}) => {
self.print_lifetime_bounds(*lifetime, bounds)?;
}
ast::WherePredicate::EqPredicate(ast::WhereEqPredicate{ref lhs_ty,
ref rhs_ty,
..}) => {
self.print_type(lhs_ty)?;
self.s.space()?;
self.word_space("=")?;
self.print_type(rhs_ty)?;
}
}
}
Ok(())
}
pub fn print_use_tree(&mut self, tree: &ast::UseTree) -> io::Result<()> {
match tree.kind {
ast::UseTreeKind::Simple(rename, ..) => {
self.print_path(&tree.prefix, false, 0)?;
if let Some(rename) = rename {
self.s.space()?;
self.word_space("as")?;
self.print_ident(rename)?;
}
}
ast::UseTreeKind::Glob => {
if !tree.prefix.segments.is_empty() {
self.print_path(&tree.prefix, false, 0)?;
self.s.word("::")?;
}
self.s.word("*")?;
}
ast::UseTreeKind::Nested(ref items) => {
if tree.prefix.segments.is_empty() {
self.s.word("{")?;
} else {
self.print_path(&tree.prefix, false, 0)?;
self.s.word("::{")?;
}
self.commasep(Inconsistent, &items[..], |this, &(ref tree, _)| {
this.print_use_tree(tree)
})?;
self.s.word("}")?;
}
}
Ok(())
}
pub fn print_mutability(&mut self,
mutbl: ast::Mutability) -> io::Result<()> {
match mutbl {
ast::Mutability::Mutable => self.word_nbsp("mut"),
ast::Mutability::Immutable => Ok(()),
}
}
pub fn print_mt(&mut self, mt: &ast::MutTy) -> io::Result<()> {
self.print_mutability(mt.mutbl)?;
self.print_type(&mt.ty)
}
pub fn print_arg(&mut self, input: &ast::Arg, is_closure: bool) -> io::Result<()> {
self.ibox(INDENT_UNIT)?;
match input.ty.node {
ast::TyKind::Infer if is_closure => self.print_pat(&input.pat)?,
_ => {
if let Some(eself) = input.to_self() {
self.print_explicit_self(&eself)?;
} else {
let invalid = if let PatKind::Ident(_, ident, _) = input.pat.node {
ident.name == keywords::Invalid.name()
} else {
false
};
if !invalid {
self.print_pat(&input.pat)?;
self.s.word(":")?;
self.s.space()?;
}
self.print_type(&input.ty)?;
}
}
}
self.end()
}
pub fn print_fn_output(&mut self, decl: &ast::FnDecl) -> io::Result<()> {
if let ast::FunctionRetTy::Default(..) = decl.output {
return Ok(());
}
self.space_if_not_bol()?;
self.ibox(INDENT_UNIT)?;
self.word_space("->")?;
match decl.output {
ast::FunctionRetTy::Default(..) => unreachable!(),
ast::FunctionRetTy::Ty(ref ty) =>
self.print_type(ty)?
}
self.end()?;
match decl.output {
ast::FunctionRetTy::Ty(ref output) => self.maybe_print_comment(output.span.lo()),
_ => Ok(())
}
}
pub fn print_ty_fn(&mut self,
abi: abi::Abi,
unsafety: ast::Unsafety,
decl: &ast::FnDecl,
name: Option<ast::Ident>,
generic_params: &[ast::GenericParam])
-> io::Result<()> {
self.ibox(INDENT_UNIT)?;
if !generic_params.is_empty() {
self.s.word("for")?;
self.print_generic_params(generic_params)?;
}
let generics = ast::Generics {
params: Vec::new(),
where_clause: ast::WhereClause {
id: ast::DUMMY_NODE_ID,
predicates: Vec::new(),
span: syntax_pos::DUMMY_SP,
},
span: syntax_pos::DUMMY_SP,
};
self.print_fn(decl,
ast::FnHeader { unsafety, abi, ..ast::FnHeader::default() },
name,
&generics,
&source_map::dummy_spanned(ast::VisibilityKind::Inherited))?;
self.end()
}
pub fn maybe_print_trailing_comment(&mut self, span: syntax_pos::Span,
next_pos: Option<BytePos>)
-> io::Result<()> {
let cm = match self.cm {
Some(cm) => cm,
_ => return Ok(())
};
if let Some(ref cmnt) = self.next_comment() {
if cmnt.style != comments::Trailing { return Ok(()) }
let span_line = cm.lookup_char_pos(span.hi());
let comment_line = cm.lookup_char_pos(cmnt.pos);
let next = next_pos.unwrap_or_else(|| cmnt.pos + BytePos(1));
if span.hi() < cmnt.pos && cmnt.pos < next && span_line.line == comment_line.line {
self.print_comment(cmnt)?;
}
}
Ok(())
}
pub fn print_remaining_comments(&mut self) -> io::Result<()> {
// If there aren't any remaining comments, then we need to manually
// make sure there is a line break at the end.
if self.next_comment().is_none() {
self.s.hardbreak()?;
}
while let Some(ref cmnt) = self.next_comment() {
self.print_comment(cmnt)?;
}
Ok(())
}
pub fn print_opt_abi_and_extern_if_nondefault(&mut self,
opt_abi: Option<Abi>)
-> io::Result<()> {
match opt_abi {
Some(Abi::Rust) => Ok(()),
Some(abi) => {
self.word_nbsp("extern")?;
self.word_nbsp(abi.to_string())
}
None => Ok(())
}
}
pub fn print_extern_opt_abi(&mut self,
opt_abi: Option<Abi>) -> io::Result<()> {
match opt_abi {
Some(abi) => {
self.word_nbsp("extern")?;
self.word_nbsp(abi.to_string())
}
None => Ok(())
}
}
pub fn print_fn_header_info(&mut self,
header: ast::FnHeader,
vis: &ast::Visibility) -> io::Result<()> {
self.s.word(visibility_qualified(vis, ""))?;
match header.constness.node {
ast::Constness::NotConst => {}
ast::Constness::Const => self.word_nbsp("const")?
}
self.print_asyncness(header.asyncness.node)?;
self.print_unsafety(header.unsafety)?;
if header.abi != Abi::Rust {
self.word_nbsp("extern")?;
self.word_nbsp(header.abi.to_string())?;
}
self.s.word("fn")
}
pub fn print_unsafety(&mut self, s: ast::Unsafety) -> io::Result<()> {
match s {
ast::Unsafety::Normal => Ok(()),
ast::Unsafety::Unsafe => self.word_nbsp("unsafe"),
}
}
pub fn print_is_auto(&mut self, s: ast::IsAuto) -> io::Result<()> {
match s {
ast::IsAuto::Yes => self.word_nbsp("auto"),
ast::IsAuto::No => Ok(()),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::ast;
use crate::source_map;
use crate::with_globals;
use syntax_pos;
#[test]
fn test_fun_to_string() {
with_globals(|| {
let abba_ident = ast::Ident::from_str("abba");
let decl = ast::FnDecl {
inputs: Vec::new(),
output: ast::FunctionRetTy::Default(syntax_pos::DUMMY_SP),
c_variadic: false
};
let generics = ast::Generics::default();
assert_eq!(
fun_to_string(
&decl,
ast::FnHeader {
unsafety: ast::Unsafety::Normal,
constness: source_map::dummy_spanned(ast::Constness::NotConst),
asyncness: source_map::dummy_spanned(ast::IsAsync::NotAsync),
abi: Abi::Rust,
},
abba_ident,
&generics
),
"fn abba()"
);
})
}
#[test]
fn test_variant_to_string() {
with_globals(|| {
let ident = ast::Ident::from_str("principal_skinner");
let var = source_map::respan(syntax_pos::DUMMY_SP, ast::Variant_ {
ident,
attrs: Vec::new(),
id: ast::DUMMY_NODE_ID,
// making this up as I go.... ?
data: ast::VariantData::Unit(ast::DUMMY_NODE_ID),
disr_expr: None,
});
let varstr = variant_to_string(&var);
assert_eq!(varstr, "principal_skinner");
})
}
}