3085 lines
112 KiB
Rust
3085 lines
112 KiB
Rust
// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution and at
|
|
// http://rust-lang.org/COPYRIGHT.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
pub use self::AnnNode::*;
|
|
|
|
use abi;
|
|
use ast;
|
|
use ast::{RegionTyParamBound, TraitTyParamBound, TraitBoundModifier};
|
|
use ast_util;
|
|
use attr;
|
|
use owned_slice::OwnedSlice;
|
|
use attr::{AttrMetaMethods, AttributeMethods};
|
|
use codemap::{self, CodeMap, BytePos};
|
|
use diagnostic;
|
|
use parse::token::{self, BinOpToken, Token, InternedString};
|
|
use parse::lexer::comments;
|
|
use parse;
|
|
use print::pp::{self, break_offset, word, space, zerobreak, hardbreak};
|
|
use print::pp::{Breaks, eof};
|
|
use print::pp::Breaks::{Consistent, Inconsistent};
|
|
use ptr::P;
|
|
use std_inject;
|
|
|
|
use std::ascii;
|
|
use std::io::{self, Write, Read};
|
|
use std::iter;
|
|
|
|
pub enum AnnNode<'a> {
|
|
NodeIdent(&'a ast::Ident),
|
|
NodeName(&'a ast::Name),
|
|
NodeBlock(&'a ast::Block),
|
|
NodeItem(&'a ast::Item),
|
|
NodeSubItem(ast::NodeId),
|
|
NodeExpr(&'a ast::Expr),
|
|
NodePat(&'a ast::Pat),
|
|
}
|
|
|
|
pub trait PpAnn {
|
|
fn pre(&self, _state: &mut State, _node: AnnNode) -> io::Result<()> { Ok(()) }
|
|
fn post(&self, _state: &mut State, _node: AnnNode) -> io::Result<()> { Ok(()) }
|
|
}
|
|
|
|
#[derive(Copy, Clone)]
|
|
pub struct NoAnn;
|
|
|
|
impl PpAnn for NoAnn {}
|
|
|
|
#[derive(Copy, Clone)]
|
|
pub struct CurrentCommentAndLiteral {
|
|
cur_cmnt: usize,
|
|
cur_lit: usize,
|
|
}
|
|
|
|
pub struct State<'a> {
|
|
pub s: pp::Printer<'a>,
|
|
cm: Option<&'a CodeMap>,
|
|
comments: Option<Vec<comments::Comment> >,
|
|
literals: Option<Vec<comments::Literal> >,
|
|
cur_cmnt_and_lit: CurrentCommentAndLiteral,
|
|
boxes: Vec<pp::Breaks>,
|
|
ann: &'a (PpAnn+'a),
|
|
}
|
|
|
|
pub fn rust_printer<'a>(writer: Box<Write+'a>) -> State<'a> {
|
|
static NO_ANN: NoAnn = NoAnn;
|
|
rust_printer_annotated(writer, &NO_ANN)
|
|
}
|
|
|
|
pub fn rust_printer_annotated<'a>(writer: Box<Write+'a>,
|
|
ann: &'a PpAnn) -> State<'a> {
|
|
State {
|
|
s: pp::mk_printer(writer, default_columns),
|
|
cm: None,
|
|
comments: None,
|
|
literals: None,
|
|
cur_cmnt_and_lit: CurrentCommentAndLiteral {
|
|
cur_cmnt: 0,
|
|
cur_lit: 0
|
|
},
|
|
boxes: Vec::new(),
|
|
ann: ann,
|
|
}
|
|
}
|
|
|
|
#[allow(non_upper_case_globals)]
|
|
pub const indent_unit: usize = 4;
|
|
|
|
#[allow(non_upper_case_globals)]
|
|
pub const default_columns: usize = 78;
|
|
|
|
/// Requires you to pass an input filename and reader so that
|
|
/// it can scan the input text for comments and literals to
|
|
/// copy forward.
|
|
pub fn print_crate<'a>(cm: &'a CodeMap,
|
|
span_diagnostic: &diagnostic::SpanHandler,
|
|
krate: &ast::Crate,
|
|
filename: String,
|
|
input: &mut Read,
|
|
out: Box<Write+'a>,
|
|
ann: &'a PpAnn,
|
|
is_expanded: bool) -> io::Result<()> {
|
|
let mut s = State::new_from_input(cm,
|
|
span_diagnostic,
|
|
filename,
|
|
input,
|
|
out,
|
|
ann,
|
|
is_expanded);
|
|
if is_expanded && std_inject::use_std(krate) {
|
|
// 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.
|
|
|
|
let no_std_meta = attr::mk_word_item(InternedString::new("no_std"));
|
|
|
|
// #![feature(no_std)]
|
|
let fake_attr = attr::mk_attr_inner(attr::mk_attr_id(),
|
|
attr::mk_list_item(InternedString::new("feature"),
|
|
vec![no_std_meta.clone()]));
|
|
try!(s.print_attribute(&fake_attr));
|
|
|
|
// #![no_std]
|
|
let fake_attr = attr::mk_attr_inner(attr::mk_attr_id(), no_std_meta);
|
|
try!(s.print_attribute(&fake_attr));
|
|
}
|
|
|
|
try!(s.print_mod(&krate.module, &krate.attrs));
|
|
try!(s.print_remaining_comments());
|
|
eof(&mut s.s)
|
|
}
|
|
|
|
impl<'a> State<'a> {
|
|
pub fn new_from_input(cm: &'a CodeMap,
|
|
span_diagnostic: &diagnostic::SpanHandler,
|
|
filename: String,
|
|
input: &mut Read,
|
|
out: Box<Write+'a>,
|
|
ann: &'a PpAnn,
|
|
is_expanded: bool) -> State<'a> {
|
|
let (cmnts, lits) = comments::gather_comments_and_literals(
|
|
span_diagnostic,
|
|
filename,
|
|
input);
|
|
|
|
State::new(
|
|
cm,
|
|
out,
|
|
ann,
|
|
Some(cmnts),
|
|
// If the code is post expansion, don't use the table of
|
|
// literals, since it doesn't correspond with the literals
|
|
// in the AST anymore.
|
|
if is_expanded { None } else { Some(lits) })
|
|
}
|
|
|
|
pub fn new(cm: &'a CodeMap,
|
|
out: Box<Write+'a>,
|
|
ann: &'a PpAnn,
|
|
comments: Option<Vec<comments::Comment>>,
|
|
literals: Option<Vec<comments::Literal>>) -> State<'a> {
|
|
State {
|
|
s: pp::mk_printer(out, default_columns),
|
|
cm: Some(cm),
|
|
comments: comments,
|
|
literals: literals,
|
|
cur_cmnt_and_lit: CurrentCommentAndLiteral {
|
|
cur_cmnt: 0,
|
|
cur_lit: 0
|
|
},
|
|
boxes: Vec::new(),
|
|
ann: ann,
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn to_string<F>(f: F) -> String where
|
|
F: FnOnce(&mut State) -> io::Result<()>,
|
|
{
|
|
let mut wr = Vec::new();
|
|
{
|
|
let mut printer = rust_printer(Box::new(&mut wr));
|
|
f(&mut printer).unwrap();
|
|
eof(&mut printer.s).unwrap();
|
|
}
|
|
String::from_utf8(wr).unwrap()
|
|
}
|
|
|
|
pub 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::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::Pound => "#".to_string(),
|
|
token::Dollar => "$".to_string(),
|
|
token::Question => "?".to_string(),
|
|
|
|
/* Literals */
|
|
token::Literal(lit, suf) => {
|
|
let mut out = match lit {
|
|
token::Byte(b) => format!("b'{}'", b.as_str()),
|
|
token::Char(c) => format!("'{}'", c.as_str()),
|
|
token::Float(c) => c.as_str().to_string(),
|
|
token::Integer(c) => c.as_str().to_string(),
|
|
token::Str_(s) => format!("\"{}\"", s.as_str()),
|
|
token::StrRaw(s, n) => format!("r{delim}\"{string}\"{delim}",
|
|
delim=repeat("#", n),
|
|
string=s.as_str()),
|
|
token::Binary(v) => format!("b\"{}\"", v.as_str()),
|
|
token::BinaryRaw(s, n) => format!("br{delim}\"{string}\"{delim}",
|
|
delim=repeat("#", n),
|
|
string=s.as_str()),
|
|
};
|
|
|
|
if let Some(s) = suf {
|
|
out.push_str(s.as_str())
|
|
}
|
|
|
|
out
|
|
}
|
|
|
|
/* Name components */
|
|
token::Ident(s, _) => token::get_ident(s).to_string(),
|
|
token::Lifetime(s) => format!("{}", token::get_ident(s)),
|
|
token::Underscore => "_".to_string(),
|
|
|
|
/* Other */
|
|
token::DocComment(s) => s.as_str().to_string(),
|
|
token::SubstNt(s, _) => format!("${}", s),
|
|
token::MatchNt(s, t, _, _) => format!("${}:{}", s, t),
|
|
token::Eof => "<eof>".to_string(),
|
|
token::Whitespace => " ".to_string(),
|
|
token::Comment => "/* */".to_string(),
|
|
token::Shebang(s) => format!("/* shebang: {}*/", s.as_str()),
|
|
|
|
token::SpecialVarNt(var) => format!("${}", var.as_str()),
|
|
|
|
token::Interpolated(ref nt) => 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(ref e, _) => ident_to_string(&**e),
|
|
token::NtTT(ref e) => tt_to_string(&**e),
|
|
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) => generics_to_string(&*e),
|
|
token::NtWhereClause(ref e) => where_clause_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::TyParamBound]) -> String {
|
|
to_string(|s| s.print_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(e: &ast::Lifetime) -> String {
|
|
to_string(|s| s.print_lifetime(e))
|
|
}
|
|
|
|
pub fn tt_to_string(tt: &ast::TokenTree) -> String {
|
|
to_string(|s| s.print_tt(tt))
|
|
}
|
|
|
|
pub fn tts_to_string(tts: &[ast::TokenTree]) -> String {
|
|
to_string(|s| s.print_tts(tts))
|
|
}
|
|
|
|
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 generics_to_string(generics: &ast::Generics) -> String {
|
|
to_string(|s| s.print_generics(generics))
|
|
}
|
|
|
|
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 ident_to_string(id: &ast::Ident) -> String {
|
|
to_string(|s| s.print_ident(*id))
|
|
}
|
|
|
|
<<<<<<< HEAD
|
|
pub fn fun_to_string(decl: &ast::FnDecl, unsafety: ast::Unsafety, name: ast::Ident,
|
|
opt_explicit_self: Option<&ast::ExplicitSelf_>,
|
|
generics: &ast::Generics) -> String {
|
|
to_string(|s| {
|
|
||||||| parent of 61a958e... syntax: parse `const fn` for free functions and inherent methods.
|
|
pub fn fun_to_string(decl: &ast::FnDecl, unsafety: ast::Unsafety, name: ast::Ident,
|
|
opt_explicit_self: Option<&ast::ExplicitSelf_>,
|
|
generics: &ast::Generics) -> String {
|
|
$to_string(|s| {
|
|
=======
|
|
pub fn fun_to_string(decl: &ast::FnDecl,
|
|
unsafety: ast::Unsafety,
|
|
constness: ast::Constness,
|
|
name: ast::Ident,
|
|
opt_explicit_self: Option<&ast::ExplicitSelf_>,
|
|
generics: &ast::Generics)
|
|
-> String {
|
|
$to_string(|s| {
|
|
>>>>>>> 61a958e... syntax: parse `const fn` for free functions and inherent methods.
|
|
try!(s.head(""));
|
|
try!(s.print_fn(decl, unsafety, constness, abi::Rust, Some(name),
|
|
generics, opt_explicit_self, ast::Inherited));
|
|
try!(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 }
|
|
try!(s.cbox(indent_unit));
|
|
// head-ibox, will be closed by print-block after {
|
|
try!(s.ibox(0));
|
|
s.print_block(blk)
|
|
})
|
|
}
|
|
|
|
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 explicit_self_to_string(explicit_self: &ast::ExplicitSelf_) -> String {
|
|
to_string(|s| s.print_explicit_self(explicit_self, ast::MutImmutable).map(|_| {}))
|
|
}
|
|
|
|
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))
|
|
}
|
|
|
|
pub fn mac_to_string(arg: &ast::Mac) -> String {
|
|
to_string(|s| s.print_mac(arg, ::parse::token::Paren))
|
|
}
|
|
|
|
pub fn visibility_qualified(vis: ast::Visibility, s: &str) -> String {
|
|
match vis {
|
|
ast::Public => format!("pub {}", s),
|
|
ast::Inherited => s.to_string()
|
|
}
|
|
}
|
|
|
|
fn needs_parentheses(expr: &ast::Expr) -> bool {
|
|
match expr.node {
|
|
ast::ExprAssign(..) | ast::ExprBinary(..) |
|
|
ast::ExprClosure(..) |
|
|
ast::ExprAssignOp(..) | ast::ExprCast(..) => true,
|
|
_ => false,
|
|
}
|
|
}
|
|
|
|
impl<'a> State<'a> {
|
|
pub fn ibox(&mut self, u: usize) -> io::Result<()> {
|
|
self.boxes.push(pp::Breaks::Inconsistent);
|
|
pp::ibox(&mut self.s, u)
|
|
}
|
|
|
|
pub fn end(&mut self) -> io::Result<()> {
|
|
self.boxes.pop().unwrap();
|
|
pp::end(&mut self.s)
|
|
}
|
|
|
|
pub fn cbox(&mut self, u: usize) -> io::Result<()> {
|
|
self.boxes.push(pp::Breaks::Consistent);
|
|
pp::cbox(&mut self.s, u)
|
|
}
|
|
|
|
// "raw box"
|
|
pub fn rbox(&mut self, u: usize, b: pp::Breaks) -> io::Result<()> {
|
|
self.boxes.push(b);
|
|
pp::rbox(&mut self.s, u, b)
|
|
}
|
|
|
|
pub fn nbsp(&mut self) -> io::Result<()> { word(&mut self.s, " ") }
|
|
|
|
pub fn word_nbsp(&mut self, w: &str) -> io::Result<()> {
|
|
try!(word(&mut self.s, w));
|
|
self.nbsp()
|
|
}
|
|
|
|
pub fn word_space(&mut self, w: &str) -> io::Result<()> {
|
|
try!(word(&mut self.s, w));
|
|
space(&mut self.s)
|
|
}
|
|
|
|
pub fn popen(&mut self) -> io::Result<()> { word(&mut self.s, "(") }
|
|
|
|
pub fn pclose(&mut self) -> io::Result<()> { word(&mut self.s, ")") }
|
|
|
|
pub fn head(&mut self, w: &str) -> io::Result<()> {
|
|
// outer-box is consistent
|
|
try!(self.cbox(indent_unit));
|
|
// head-box is inconsistent
|
|
try!(self.ibox(w.len() + 1));
|
|
// keyword that starts the head
|
|
if !w.is_empty() {
|
|
try!(self.word_nbsp(w));
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn bopen(&mut self) -> io::Result<()> {
|
|
try!(word(&mut self.s, "{"));
|
|
self.end() // close the head-box
|
|
}
|
|
|
|
pub fn bclose_(&mut self, span: codemap::Span,
|
|
indented: usize) -> io::Result<()> {
|
|
self.bclose_maybe_open(span, indented, true)
|
|
}
|
|
pub fn bclose_maybe_open (&mut self, span: codemap::Span,
|
|
indented: usize, close_box: bool) -> io::Result<()> {
|
|
try!(self.maybe_print_comment(span.hi));
|
|
try!(self.break_offset_if_not_bol(1, -(indented as isize)));
|
|
try!(word(&mut self.s, "}"));
|
|
if close_box {
|
|
try!(self.end()); // close the outer-box
|
|
}
|
|
Ok(())
|
|
}
|
|
pub fn bclose(&mut self, span: codemap::Span) -> io::Result<()> {
|
|
self.bclose_(span, indent_unit)
|
|
}
|
|
|
|
pub fn is_begin(&mut self) -> bool {
|
|
match self.s.last_token() {
|
|
pp::Token::Begin(_) => true,
|
|
_ => false,
|
|
}
|
|
}
|
|
|
|
pub fn is_end(&mut self) -> bool {
|
|
match self.s.last_token() {
|
|
pp::Token::End => true,
|
|
_ => false,
|
|
}
|
|
}
|
|
|
|
// is this the beginning of a line?
|
|
pub fn is_bol(&mut self) -> bool {
|
|
self.s.last_token().is_eof() || self.s.last_token().is_hardbreak_tok()
|
|
}
|
|
|
|
pub fn in_cbox(&self) -> bool {
|
|
match self.boxes.last() {
|
|
Some(&last_box) => last_box == pp::Breaks::Consistent,
|
|
None => false
|
|
}
|
|
}
|
|
|
|
pub fn hardbreak_if_not_bol(&mut self) -> io::Result<()> {
|
|
if !self.is_bol() {
|
|
try!(hardbreak(&mut self.s))
|
|
}
|
|
Ok(())
|
|
}
|
|
pub fn space_if_not_bol(&mut self) -> io::Result<()> {
|
|
if !self.is_bol() { try!(space(&mut self.s)); }
|
|
Ok(())
|
|
}
|
|
pub fn break_offset_if_not_bol(&mut self, n: usize,
|
|
off: isize) -> io::Result<()> {
|
|
if !self.is_bol() {
|
|
break_offset(&mut self.s, 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::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<()> {
|
|
try!(word(&mut self.s, "/*"));
|
|
try!(space(&mut self.s));
|
|
try!(word(&mut self.s, &text[..]));
|
|
try!(space(&mut self.s));
|
|
word(&mut self.s, "*/")
|
|
}
|
|
|
|
pub fn commasep<T, F>(&mut self, b: Breaks, elts: &[T], mut op: F) -> io::Result<()> where
|
|
F: FnMut(&mut State, &T) -> io::Result<()>,
|
|
{
|
|
try!(self.rbox(0, b));
|
|
let mut first = true;
|
|
for elt in elts {
|
|
if first { first = false; } else { try!(self.word_space(",")); }
|
|
try!(op(self, elt));
|
|
}
|
|
self.end()
|
|
}
|
|
|
|
|
|
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) -> codemap::Span,
|
|
{
|
|
try!(self.rbox(0, b));
|
|
let len = elts.len();
|
|
let mut i = 0;
|
|
for elt in elts {
|
|
try!(self.maybe_print_comment(get_span(elt).hi));
|
|
try!(op(self, elt));
|
|
i += 1;
|
|
if i < len {
|
|
try!(word(&mut self.s, ","));
|
|
try!(self.maybe_print_trailing_comment(get_span(elt),
|
|
Some(get_span(&elts[i]).hi)));
|
|
try!(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<()> {
|
|
try!(self.print_inner_attributes(attrs));
|
|
for item in &_mod.items {
|
|
try!(self.print_item(&**item));
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_foreign_mod(&mut self, nmod: &ast::ForeignMod,
|
|
attrs: &[ast::Attribute]) -> io::Result<()> {
|
|
try!(self.print_inner_attributes(attrs));
|
|
for item in &nmod.items {
|
|
try!(self.print_foreign_item(&**item));
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_opt_lifetime(&mut self,
|
|
lifetime: &Option<ast::Lifetime>) -> io::Result<()> {
|
|
if let Some(l) = *lifetime {
|
|
try!(self.print_lifetime(&l));
|
|
try!(self.nbsp());
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_type(&mut self, ty: &ast::Ty) -> io::Result<()> {
|
|
try!(self.maybe_print_comment(ty.span.lo));
|
|
try!(self.ibox(0));
|
|
match ty.node {
|
|
ast::TyVec(ref ty) => {
|
|
try!(word(&mut self.s, "["));
|
|
try!(self.print_type(&**ty));
|
|
try!(word(&mut self.s, "]"));
|
|
}
|
|
ast::TyPtr(ref mt) => {
|
|
try!(word(&mut self.s, "*"));
|
|
match mt.mutbl {
|
|
ast::MutMutable => try!(self.word_nbsp("mut")),
|
|
ast::MutImmutable => try!(self.word_nbsp("const")),
|
|
}
|
|
try!(self.print_type(&*mt.ty));
|
|
}
|
|
ast::TyRptr(ref lifetime, ref mt) => {
|
|
try!(word(&mut self.s, "&"));
|
|
try!(self.print_opt_lifetime(lifetime));
|
|
try!(self.print_mt(mt));
|
|
}
|
|
ast::TyTup(ref elts) => {
|
|
try!(self.popen());
|
|
try!(self.commasep(Inconsistent, &elts[..],
|
|
|s, ty| s.print_type(&**ty)));
|
|
if elts.len() == 1 {
|
|
try!(word(&mut self.s, ","));
|
|
}
|
|
try!(self.pclose());
|
|
}
|
|
ast::TyParen(ref typ) => {
|
|
try!(self.popen());
|
|
try!(self.print_type(&**typ));
|
|
try!(self.pclose());
|
|
}
|
|
ast::TyBareFn(ref f) => {
|
|
let generics = ast::Generics {
|
|
lifetimes: f.lifetimes.clone(),
|
|
ty_params: OwnedSlice::empty(),
|
|
where_clause: ast::WhereClause {
|
|
id: ast::DUMMY_NODE_ID,
|
|
predicates: Vec::new(),
|
|
},
|
|
};
|
|
try!(self.print_ty_fn(f.abi,
|
|
f.unsafety,
|
|
&*f.decl,
|
|
None,
|
|
&generics,
|
|
None));
|
|
}
|
|
ast::TyPath(None, ref path) => {
|
|
try!(self.print_path(path, false, 0));
|
|
}
|
|
ast::TyPath(Some(ref qself), ref path) => {
|
|
try!(self.print_qpath(path, qself, false))
|
|
}
|
|
ast::TyObjectSum(ref ty, ref bounds) => {
|
|
try!(self.print_type(&**ty));
|
|
try!(self.print_bounds("+", &bounds[..]));
|
|
}
|
|
ast::TyPolyTraitRef(ref bounds) => {
|
|
try!(self.print_bounds("", &bounds[..]));
|
|
}
|
|
ast::TyFixedLengthVec(ref ty, ref v) => {
|
|
try!(word(&mut self.s, "["));
|
|
try!(self.print_type(&**ty));
|
|
try!(word(&mut self.s, "; "));
|
|
try!(self.print_expr(&**v));
|
|
try!(word(&mut self.s, "]"));
|
|
}
|
|
ast::TyTypeof(ref e) => {
|
|
try!(word(&mut self.s, "typeof("));
|
|
try!(self.print_expr(&**e));
|
|
try!(word(&mut self.s, ")"));
|
|
}
|
|
ast::TyInfer => {
|
|
try!(word(&mut self.s, "_"));
|
|
}
|
|
}
|
|
self.end()
|
|
}
|
|
|
|
pub fn print_foreign_item(&mut self,
|
|
item: &ast::ForeignItem) -> io::Result<()> {
|
|
try!(self.hardbreak_if_not_bol());
|
|
try!(self.maybe_print_comment(item.span.lo));
|
|
try!(self.print_outer_attributes(&item.attrs));
|
|
match item.node {
|
|
ast::ForeignItemFn(ref decl, ref generics) => {
|
|
try!(self.head(""));
|
|
try!(self.print_fn(decl, ast::Unsafety::Normal,
|
|
ast::Constness::NotConst,
|
|
abi::Rust, Some(item.ident),
|
|
generics, None, item.vis));
|
|
try!(self.end()); // end head-ibox
|
|
try!(word(&mut self.s, ";"));
|
|
self.end() // end the outer fn box
|
|
}
|
|
ast::ForeignItemStatic(ref t, m) => {
|
|
try!(self.head(&visibility_qualified(item.vis,
|
|
"static")));
|
|
if m {
|
|
try!(self.word_space("mut"));
|
|
}
|
|
try!(self.print_ident(item.ident));
|
|
try!(self.word_space(":"));
|
|
try!(self.print_type(&**t));
|
|
try!(word(&mut self.s, ";"));
|
|
try!(self.end()); // end the head-ibox
|
|
self.end() // end the outer cbox
|
|
}
|
|
}
|
|
}
|
|
|
|
fn print_associated_const(&mut self,
|
|
ident: ast::Ident,
|
|
ty: &ast::Ty,
|
|
default: Option<&ast::Expr>,
|
|
vis: ast::Visibility)
|
|
-> io::Result<()>
|
|
{
|
|
try!(word(&mut self.s, &visibility_qualified(vis, "")));
|
|
try!(self.word_space("const"));
|
|
try!(self.print_ident(ident));
|
|
try!(self.word_space(":"));
|
|
try!(self.print_type(ty));
|
|
if let Some(expr) = default {
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("="));
|
|
try!(self.print_expr(expr));
|
|
}
|
|
word(&mut self.s, ";")
|
|
}
|
|
|
|
fn print_associated_type(&mut self,
|
|
ident: ast::Ident,
|
|
bounds: Option<&ast::TyParamBounds>,
|
|
ty: Option<&ast::Ty>)
|
|
-> io::Result<()> {
|
|
try!(self.word_space("type"));
|
|
try!(self.print_ident(ident));
|
|
if let Some(bounds) = bounds {
|
|
try!(self.print_bounds(":", bounds));
|
|
}
|
|
if let Some(ty) = ty {
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("="));
|
|
try!(self.print_type(ty));
|
|
}
|
|
word(&mut self.s, ";")
|
|
}
|
|
|
|
/// Pretty-print an item
|
|
pub fn print_item(&mut self, item: &ast::Item) -> io::Result<()> {
|
|
try!(self.hardbreak_if_not_bol());
|
|
try!(self.maybe_print_comment(item.span.lo));
|
|
try!(self.print_outer_attributes(&item.attrs));
|
|
try!(self.ann.pre(self, NodeItem(item)));
|
|
match item.node {
|
|
ast::ItemExternCrate(ref optional_path) => {
|
|
try!(self.head(&visibility_qualified(item.vis,
|
|
"extern crate")));
|
|
if let Some(p) = *optional_path {
|
|
let val = token::get_name(p);
|
|
if val.contains("-") {
|
|
try!(self.print_string(&val, ast::CookedStr));
|
|
} else {
|
|
try!(self.print_name(p));
|
|
}
|
|
try!(space(&mut self.s));
|
|
try!(word(&mut self.s, "as"));
|
|
try!(space(&mut self.s));
|
|
}
|
|
try!(self.print_ident(item.ident));
|
|
try!(word(&mut self.s, ";"));
|
|
try!(self.end()); // end inner head-block
|
|
try!(self.end()); // end outer head-block
|
|
}
|
|
ast::ItemUse(ref vp) => {
|
|
try!(self.head(&visibility_qualified(item.vis,
|
|
"use")));
|
|
try!(self.print_view_path(&**vp));
|
|
try!(word(&mut self.s, ";"));
|
|
try!(self.end()); // end inner head-block
|
|
try!(self.end()); // end outer head-block
|
|
}
|
|
ast::ItemStatic(ref ty, m, ref expr) => {
|
|
try!(self.head(&visibility_qualified(item.vis,
|
|
"static")));
|
|
if m == ast::MutMutable {
|
|
try!(self.word_space("mut"));
|
|
}
|
|
try!(self.print_ident(item.ident));
|
|
try!(self.word_space(":"));
|
|
try!(self.print_type(&**ty));
|
|
try!(space(&mut self.s));
|
|
try!(self.end()); // end the head-ibox
|
|
|
|
try!(self.word_space("="));
|
|
try!(self.print_expr(&**expr));
|
|
try!(word(&mut self.s, ";"));
|
|
try!(self.end()); // end the outer cbox
|
|
}
|
|
ast::ItemConst(ref ty, ref expr) => {
|
|
try!(self.head(&visibility_qualified(item.vis,
|
|
"const")));
|
|
try!(self.print_ident(item.ident));
|
|
try!(self.word_space(":"));
|
|
try!(self.print_type(&**ty));
|
|
try!(space(&mut self.s));
|
|
try!(self.end()); // end the head-ibox
|
|
|
|
try!(self.word_space("="));
|
|
try!(self.print_expr(&**expr));
|
|
try!(word(&mut self.s, ";"));
|
|
try!(self.end()); // end the outer cbox
|
|
}
|
|
ast::ItemFn(ref decl, unsafety, constness, abi, ref typarams, ref body) => {
|
|
try!(self.head(""));
|
|
try!(self.print_fn(
|
|
decl,
|
|
unsafety,
|
|
constness,
|
|
abi,
|
|
Some(item.ident),
|
|
typarams,
|
|
None,
|
|
item.vis
|
|
));
|
|
try!(word(&mut self.s, " "));
|
|
try!(self.print_block_with_attrs(&**body, &item.attrs));
|
|
}
|
|
ast::ItemMod(ref _mod) => {
|
|
try!(self.head(&visibility_qualified(item.vis,
|
|
"mod")));
|
|
try!(self.print_ident(item.ident));
|
|
try!(self.nbsp());
|
|
try!(self.bopen());
|
|
try!(self.print_mod(_mod, &item.attrs));
|
|
try!(self.bclose(item.span));
|
|
}
|
|
ast::ItemForeignMod(ref nmod) => {
|
|
try!(self.head("extern"));
|
|
try!(self.word_nbsp(&nmod.abi.to_string()));
|
|
try!(self.bopen());
|
|
try!(self.print_foreign_mod(nmod, &item.attrs));
|
|
try!(self.bclose(item.span));
|
|
}
|
|
ast::ItemTy(ref ty, ref params) => {
|
|
try!(self.ibox(indent_unit));
|
|
try!(self.ibox(0));
|
|
try!(self.word_nbsp(&visibility_qualified(item.vis, "type")));
|
|
try!(self.print_ident(item.ident));
|
|
try!(self.print_generics(params));
|
|
try!(self.end()); // end the inner ibox
|
|
|
|
try!(self.print_where_clause(¶ms.where_clause));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("="));
|
|
try!(self.print_type(&**ty));
|
|
try!(word(&mut self.s, ";"));
|
|
try!(self.end()); // end the outer ibox
|
|
}
|
|
ast::ItemEnum(ref enum_definition, ref params) => {
|
|
try!(self.print_enum_def(
|
|
enum_definition,
|
|
params,
|
|
item.ident,
|
|
item.span,
|
|
item.vis
|
|
));
|
|
}
|
|
ast::ItemStruct(ref struct_def, ref generics) => {
|
|
try!(self.head(&visibility_qualified(item.vis,"struct")));
|
|
try!(self.print_struct(&**struct_def, generics, item.ident, item.span));
|
|
}
|
|
|
|
ast::ItemDefaultImpl(unsafety, ref trait_ref) => {
|
|
try!(self.head(""));
|
|
try!(self.print_visibility(item.vis));
|
|
try!(self.print_unsafety(unsafety));
|
|
try!(self.word_nbsp("impl"));
|
|
try!(self.print_trait_ref(trait_ref));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("for"));
|
|
try!(self.word_space(".."));
|
|
try!(self.bopen());
|
|
try!(self.bclose(item.span));
|
|
}
|
|
ast::ItemImpl(unsafety,
|
|
polarity,
|
|
ref generics,
|
|
ref opt_trait,
|
|
ref ty,
|
|
ref impl_items) => {
|
|
try!(self.head(""));
|
|
try!(self.print_visibility(item.vis));
|
|
try!(self.print_unsafety(unsafety));
|
|
try!(self.word_nbsp("impl"));
|
|
|
|
if generics.is_parameterized() {
|
|
try!(self.print_generics(generics));
|
|
try!(space(&mut self.s));
|
|
}
|
|
|
|
match polarity {
|
|
ast::ImplPolarity::Negative => {
|
|
try!(word(&mut self.s, "!"));
|
|
},
|
|
_ => {}
|
|
}
|
|
|
|
match opt_trait {
|
|
&Some(ref t) => {
|
|
try!(self.print_trait_ref(t));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("for"));
|
|
}
|
|
&None => {}
|
|
}
|
|
|
|
try!(self.print_type(&**ty));
|
|
try!(self.print_where_clause(&generics.where_clause));
|
|
|
|
try!(space(&mut self.s));
|
|
try!(self.bopen());
|
|
try!(self.print_inner_attributes(&item.attrs));
|
|
for impl_item in impl_items {
|
|
try!(self.print_impl_item(impl_item));
|
|
}
|
|
try!(self.bclose(item.span));
|
|
}
|
|
ast::ItemTrait(unsafety, ref generics, ref bounds, ref trait_items) => {
|
|
try!(self.head(""));
|
|
try!(self.print_visibility(item.vis));
|
|
try!(self.print_unsafety(unsafety));
|
|
try!(self.word_nbsp("trait"));
|
|
try!(self.print_ident(item.ident));
|
|
try!(self.print_generics(generics));
|
|
let mut real_bounds = Vec::with_capacity(bounds.len());
|
|
for b in bounds.iter() {
|
|
if let TraitTyParamBound(ref ptr, ast::TraitBoundModifier::Maybe) = *b {
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("for ?"));
|
|
try!(self.print_trait_ref(&ptr.trait_ref));
|
|
} else {
|
|
real_bounds.push(b.clone());
|
|
}
|
|
}
|
|
try!(self.print_bounds(":", &real_bounds[..]));
|
|
try!(self.print_where_clause(&generics.where_clause));
|
|
try!(word(&mut self.s, " "));
|
|
try!(self.bopen());
|
|
for trait_item in trait_items {
|
|
try!(self.print_trait_item(trait_item));
|
|
}
|
|
try!(self.bclose(item.span));
|
|
}
|
|
// I think it's reasonable to hide the context here:
|
|
ast::ItemMac(codemap::Spanned { node: ast::MacInvocTT(ref pth, ref tts, _),
|
|
..}) => {
|
|
try!(self.print_visibility(item.vis));
|
|
try!(self.print_path(pth, false, 0));
|
|
try!(word(&mut self.s, "! "));
|
|
try!(self.print_ident(item.ident));
|
|
try!(self.cbox(indent_unit));
|
|
try!(self.popen());
|
|
try!(self.print_tts(&tts[..]));
|
|
try!(self.pclose());
|
|
try!(word(&mut self.s, ";"));
|
|
try!(self.end());
|
|
}
|
|
}
|
|
self.ann.post(self, NodeItem(item))
|
|
}
|
|
|
|
fn print_trait_ref(&mut self, t: &ast::TraitRef) -> io::Result<()> {
|
|
self.print_path(&t.path, false, 0)
|
|
}
|
|
|
|
fn print_formal_lifetime_list(&mut self, lifetimes: &[ast::LifetimeDef]) -> io::Result<()> {
|
|
if !lifetimes.is_empty() {
|
|
try!(word(&mut self.s, "for<"));
|
|
let mut comma = false;
|
|
for lifetime_def in lifetimes {
|
|
if comma {
|
|
try!(self.word_space(","))
|
|
}
|
|
try!(self.print_lifetime_def(lifetime_def));
|
|
comma = true;
|
|
}
|
|
try!(word(&mut self.s, ">"));
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
fn print_poly_trait_ref(&mut self, t: &ast::PolyTraitRef) -> io::Result<()> {
|
|
try!(self.print_formal_lifetime_list(&t.bound_lifetimes));
|
|
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: codemap::Span,
|
|
visibility: ast::Visibility) -> io::Result<()> {
|
|
try!(self.head(&visibility_qualified(visibility, "enum")));
|
|
try!(self.print_ident(ident));
|
|
try!(self.print_generics(generics));
|
|
try!(self.print_where_clause(&generics.where_clause));
|
|
try!(space(&mut self.s));
|
|
self.print_variants(&enum_definition.variants, span)
|
|
}
|
|
|
|
pub fn print_variants(&mut self,
|
|
variants: &[P<ast::Variant>],
|
|
span: codemap::Span) -> io::Result<()> {
|
|
try!(self.bopen());
|
|
for v in variants {
|
|
try!(self.space_if_not_bol());
|
|
try!(self.maybe_print_comment(v.span.lo));
|
|
try!(self.print_outer_attributes(&v.node.attrs));
|
|
try!(self.ibox(indent_unit));
|
|
try!(self.print_variant(&**v));
|
|
try!(word(&mut self.s, ","));
|
|
try!(self.end());
|
|
try!(self.maybe_print_trailing_comment(v.span, None));
|
|
}
|
|
self.bclose(span)
|
|
}
|
|
|
|
pub fn print_visibility(&mut self, vis: ast::Visibility) -> io::Result<()> {
|
|
match vis {
|
|
ast::Public => self.word_nbsp("pub"),
|
|
ast::Inherited => Ok(())
|
|
}
|
|
}
|
|
|
|
pub fn print_struct(&mut self,
|
|
struct_def: &ast::StructDef,
|
|
generics: &ast::Generics,
|
|
ident: ast::Ident,
|
|
span: codemap::Span) -> io::Result<()> {
|
|
try!(self.print_ident(ident));
|
|
try!(self.print_generics(generics));
|
|
if ast_util::struct_def_is_tuple_like(struct_def) {
|
|
if !struct_def.fields.is_empty() {
|
|
try!(self.popen());
|
|
try!(self.commasep(
|
|
Inconsistent, &struct_def.fields,
|
|
|s, field| {
|
|
match field.node.kind {
|
|
ast::NamedField(..) => panic!("unexpected named field"),
|
|
ast::UnnamedField(vis) => {
|
|
try!(s.print_visibility(vis));
|
|
try!(s.maybe_print_comment(field.span.lo));
|
|
s.print_type(&*field.node.ty)
|
|
}
|
|
}
|
|
}
|
|
));
|
|
try!(self.pclose());
|
|
}
|
|
try!(self.print_where_clause(&generics.where_clause));
|
|
try!(word(&mut self.s, ";"));
|
|
try!(self.end());
|
|
self.end() // close the outer-box
|
|
} else {
|
|
try!(self.print_where_clause(&generics.where_clause));
|
|
try!(self.nbsp());
|
|
try!(self.bopen());
|
|
try!(self.hardbreak_if_not_bol());
|
|
|
|
for field in &struct_def.fields {
|
|
match field.node.kind {
|
|
ast::UnnamedField(..) => panic!("unexpected unnamed field"),
|
|
ast::NamedField(ident, visibility) => {
|
|
try!(self.hardbreak_if_not_bol());
|
|
try!(self.maybe_print_comment(field.span.lo));
|
|
try!(self.print_outer_attributes(&field.node.attrs));
|
|
try!(self.print_visibility(visibility));
|
|
try!(self.print_ident(ident));
|
|
try!(self.word_nbsp(":"));
|
|
try!(self.print_type(&*field.node.ty));
|
|
try!(word(&mut self.s, ","));
|
|
}
|
|
}
|
|
}
|
|
|
|
self.bclose(span)
|
|
}
|
|
}
|
|
|
|
/// 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.
|
|
pub fn print_tt(&mut self, tt: &ast::TokenTree) -> io::Result<()> {
|
|
match *tt {
|
|
ast::TtToken(_, ref tk) => {
|
|
try!(word(&mut self.s, &token_to_string(tk)));
|
|
match *tk {
|
|
parse::token::DocComment(..) => {
|
|
hardbreak(&mut self.s)
|
|
}
|
|
_ => Ok(())
|
|
}
|
|
}
|
|
ast::TtDelimited(_, ref delimed) => {
|
|
try!(word(&mut self.s, &token_to_string(&delimed.open_token())));
|
|
try!(space(&mut self.s));
|
|
try!(self.print_tts(&delimed.tts));
|
|
try!(space(&mut self.s));
|
|
word(&mut self.s, &token_to_string(&delimed.close_token()))
|
|
},
|
|
ast::TtSequence(_, ref seq) => {
|
|
try!(word(&mut self.s, "$("));
|
|
for tt_elt in &seq.tts {
|
|
try!(self.print_tt(tt_elt));
|
|
}
|
|
try!(word(&mut self.s, ")"));
|
|
match seq.separator {
|
|
Some(ref tk) => {
|
|
try!(word(&mut self.s, &token_to_string(tk)));
|
|
}
|
|
None => {},
|
|
}
|
|
match seq.op {
|
|
ast::ZeroOrMore => word(&mut self.s, "*"),
|
|
ast::OneOrMore => word(&mut self.s, "+"),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn print_tts(&mut self, tts: &[ast::TokenTree]) -> io::Result<()> {
|
|
try!(self.ibox(0));
|
|
let mut suppress_space = false;
|
|
for (i, tt) in tts.iter().enumerate() {
|
|
if i != 0 && !suppress_space {
|
|
try!(space(&mut self.s));
|
|
}
|
|
try!(self.print_tt(tt));
|
|
// There should be no space between the module name and the following `::` in paths,
|
|
// otherwise imported macros get re-parsed from crate metadata incorrectly (#20701)
|
|
suppress_space = match tt {
|
|
&ast::TtToken(_, token::Ident(_, token::ModName)) |
|
|
&ast::TtToken(_, token::MatchNt(_, _, _, token::ModName)) |
|
|
&ast::TtToken(_, token::SubstNt(_, token::ModName)) => true,
|
|
_ => false
|
|
}
|
|
}
|
|
self.end()
|
|
}
|
|
|
|
pub fn print_variant(&mut self, v: &ast::Variant) -> io::Result<()> {
|
|
try!(self.print_visibility(v.node.vis));
|
|
match v.node.kind {
|
|
ast::TupleVariantKind(ref args) => {
|
|
try!(self.print_ident(v.node.name));
|
|
if !args.is_empty() {
|
|
try!(self.popen());
|
|
try!(self.commasep(Consistent,
|
|
&args[..],
|
|
|s, arg| s.print_type(&*arg.ty)));
|
|
try!(self.pclose());
|
|
}
|
|
}
|
|
ast::StructVariantKind(ref struct_def) => {
|
|
try!(self.head(""));
|
|
let generics = ast_util::empty_generics();
|
|
try!(self.print_struct(&**struct_def, &generics, v.node.name, v.span));
|
|
}
|
|
}
|
|
match v.node.disr_expr {
|
|
Some(ref d) => {
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("="));
|
|
self.print_expr(&**d)
|
|
}
|
|
_ => Ok(())
|
|
}
|
|
}
|
|
|
|
pub fn print_method_sig(&mut self,
|
|
ident: ast::Ident,
|
|
m: &ast::MethodSig,
|
|
vis: ast::Visibility)
|
|
-> io::Result<()> {
|
|
self.print_fn(&m.decl,
|
|
m.unsafety,
|
|
m.constness,
|
|
m.abi,
|
|
Some(ident),
|
|
&m.generics,
|
|
Some(&m.explicit_self.node),
|
|
vis)
|
|
}
|
|
|
|
pub fn print_trait_item(&mut self, ti: &ast::TraitItem)
|
|
-> io::Result<()> {
|
|
try!(self.ann.pre(self, NodeSubItem(ti.id)));
|
|
try!(self.hardbreak_if_not_bol());
|
|
try!(self.maybe_print_comment(ti.span.lo));
|
|
try!(self.print_outer_attributes(&ti.attrs));
|
|
match ti.node {
|
|
ast::ConstTraitItem(ref ty, ref default) => {
|
|
try!(self.print_associated_const(ti.ident, &ty,
|
|
default.as_ref().map(|expr| &**expr),
|
|
ast::Inherited));
|
|
}
|
|
ast::MethodTraitItem(ref sig, ref body) => {
|
|
if body.is_some() {
|
|
try!(self.head(""));
|
|
}
|
|
try!(self.print_method_sig(ti.ident, sig, ast::Inherited));
|
|
if let Some(ref body) = *body {
|
|
try!(self.nbsp());
|
|
try!(self.print_block_with_attrs(body, &ti.attrs));
|
|
} else {
|
|
try!(word(&mut self.s, ";"));
|
|
}
|
|
}
|
|
ast::TypeTraitItem(ref bounds, ref default) => {
|
|
try!(self.print_associated_type(ti.ident, Some(bounds),
|
|
default.as_ref().map(|ty| &**ty)));
|
|
}
|
|
}
|
|
self.ann.post(self, NodeSubItem(ti.id))
|
|
}
|
|
|
|
pub fn print_impl_item(&mut self, ii: &ast::ImplItem) -> io::Result<()> {
|
|
try!(self.ann.pre(self, NodeSubItem(ii.id)));
|
|
try!(self.hardbreak_if_not_bol());
|
|
try!(self.maybe_print_comment(ii.span.lo));
|
|
try!(self.print_outer_attributes(&ii.attrs));
|
|
match ii.node {
|
|
ast::ConstImplItem(ref ty, ref expr) => {
|
|
try!(self.print_associated_const(ii.ident, &ty, Some(&expr), ii.vis));
|
|
}
|
|
ast::MethodImplItem(ref sig, ref body) => {
|
|
try!(self.head(""));
|
|
try!(self.print_method_sig(ii.ident, sig, ii.vis));
|
|
try!(self.nbsp());
|
|
try!(self.print_block_with_attrs(body, &ii.attrs));
|
|
}
|
|
ast::TypeImplItem(ref ty) => {
|
|
try!(self.print_associated_type(ii.ident, None, Some(ty)));
|
|
}
|
|
ast::MacImplItem(codemap::Spanned { node: ast::MacInvocTT(ref pth, ref tts, _),
|
|
..}) => {
|
|
// code copied from ItemMac:
|
|
try!(self.print_path(pth, false, 0));
|
|
try!(word(&mut self.s, "! "));
|
|
try!(self.cbox(indent_unit));
|
|
try!(self.popen());
|
|
try!(self.print_tts(&tts[..]));
|
|
try!(self.pclose());
|
|
try!(word(&mut self.s, ";"));
|
|
try!(self.end())
|
|
}
|
|
}
|
|
self.ann.post(self, NodeSubItem(ii.id))
|
|
}
|
|
|
|
pub fn print_outer_attributes(&mut self,
|
|
attrs: &[ast::Attribute]) -> io::Result<()> {
|
|
let mut count = 0;
|
|
for attr in attrs {
|
|
match attr.node.style {
|
|
ast::AttrOuter => {
|
|
try!(self.print_attribute(attr));
|
|
count += 1;
|
|
}
|
|
_ => {/* fallthrough */ }
|
|
}
|
|
}
|
|
if count > 0 {
|
|
try!(self.hardbreak_if_not_bol());
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_inner_attributes(&mut self,
|
|
attrs: &[ast::Attribute]) -> io::Result<()> {
|
|
let mut count = 0;
|
|
for attr in attrs {
|
|
match attr.node.style {
|
|
ast::AttrInner => {
|
|
try!(self.print_attribute(attr));
|
|
count += 1;
|
|
}
|
|
_ => {/* fallthrough */ }
|
|
}
|
|
}
|
|
if count > 0 {
|
|
try!(self.hardbreak_if_not_bol());
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_attribute(&mut self, attr: &ast::Attribute) -> io::Result<()> {
|
|
try!(self.hardbreak_if_not_bol());
|
|
try!(self.maybe_print_comment(attr.span.lo));
|
|
if attr.node.is_sugared_doc {
|
|
word(&mut self.s, &attr.value_str().unwrap())
|
|
} else {
|
|
match attr.node.style {
|
|
ast::AttrInner => try!(word(&mut self.s, "#![")),
|
|
ast::AttrOuter => try!(word(&mut self.s, "#[")),
|
|
}
|
|
try!(self.print_meta_item(&*attr.meta()));
|
|
word(&mut self.s, "]")
|
|
}
|
|
}
|
|
|
|
|
|
pub fn print_stmt(&mut self, st: &ast::Stmt) -> io::Result<()> {
|
|
try!(self.maybe_print_comment(st.span.lo));
|
|
match st.node {
|
|
ast::StmtDecl(ref decl, _) => {
|
|
try!(self.print_decl(&**decl));
|
|
}
|
|
ast::StmtExpr(ref expr, _) => {
|
|
try!(self.space_if_not_bol());
|
|
try!(self.print_expr(&**expr));
|
|
}
|
|
ast::StmtSemi(ref expr, _) => {
|
|
try!(self.space_if_not_bol());
|
|
try!(self.print_expr(&**expr));
|
|
try!(word(&mut self.s, ";"));
|
|
}
|
|
ast::StmtMac(ref mac, style) => {
|
|
try!(self.space_if_not_bol());
|
|
let delim = match style {
|
|
ast::MacStmtWithBraces => token::Brace,
|
|
_ => token::Paren
|
|
};
|
|
try!(self.print_mac(&**mac, delim));
|
|
match style {
|
|
ast::MacStmtWithBraces => {}
|
|
_ => try!(word(&mut self.s, ";")),
|
|
}
|
|
}
|
|
}
|
|
if parse::classify::stmt_ends_with_semi(&st.node) {
|
|
try!(word(&mut self.s, ";"));
|
|
}
|
|
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_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 {
|
|
ast::UnsafeBlock(..) => try!(self.word_space("unsafe")),
|
|
ast::DefaultBlock => ()
|
|
}
|
|
try!(self.maybe_print_comment(blk.span.lo));
|
|
try!(self.ann.pre(self, NodeBlock(blk)));
|
|
try!(self.bopen());
|
|
|
|
try!(self.print_inner_attributes(attrs));
|
|
|
|
for st in &blk.stmts {
|
|
try!(self.print_stmt(&**st));
|
|
}
|
|
match blk.expr {
|
|
Some(ref expr) => {
|
|
try!(self.space_if_not_bol());
|
|
try!(self.print_expr(&**expr));
|
|
try!(self.maybe_print_trailing_comment(expr.span, Some(blk.span.hi)));
|
|
}
|
|
_ => ()
|
|
}
|
|
try!(self.bclose_maybe_open(blk.span, indented, close_box));
|
|
self.ann.post(self, NodeBlock(blk))
|
|
}
|
|
|
|
fn print_else(&mut self, els: Option<&ast::Expr>) -> io::Result<()> {
|
|
match els {
|
|
Some(_else) => {
|
|
match _else.node {
|
|
// "another else-if"
|
|
ast::ExprIf(ref i, ref then, ref e) => {
|
|
try!(self.cbox(indent_unit - 1));
|
|
try!(self.ibox(0));
|
|
try!(word(&mut self.s, " else if "));
|
|
try!(self.print_expr(&**i));
|
|
try!(space(&mut self.s));
|
|
try!(self.print_block(&**then));
|
|
self.print_else(e.as_ref().map(|e| &**e))
|
|
}
|
|
// "another else-if-let"
|
|
ast::ExprIfLet(ref pat, ref expr, ref then, ref e) => {
|
|
try!(self.cbox(indent_unit - 1));
|
|
try!(self.ibox(0));
|
|
try!(word(&mut self.s, " else if let "));
|
|
try!(self.print_pat(&**pat));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("="));
|
|
try!(self.print_expr(&**expr));
|
|
try!(space(&mut self.s));
|
|
try!(self.print_block(&**then));
|
|
self.print_else(e.as_ref().map(|e| &**e))
|
|
}
|
|
// "final else"
|
|
ast::ExprBlock(ref b) => {
|
|
try!(self.cbox(indent_unit - 1));
|
|
try!(self.ibox(0));
|
|
try!(word(&mut self.s, " 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<()> {
|
|
try!(self.head("if"));
|
|
try!(self.print_expr(test));
|
|
try!(space(&mut self.s));
|
|
try!(self.print_block(blk));
|
|
self.print_else(elseopt)
|
|
}
|
|
|
|
pub fn print_if_let(&mut self, pat: &ast::Pat, expr: &ast::Expr, blk: &ast::Block,
|
|
elseopt: Option<&ast::Expr>) -> io::Result<()> {
|
|
try!(self.head("if let"));
|
|
try!(self.print_pat(pat));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("="));
|
|
try!(self.print_expr(expr));
|
|
try!(space(&mut self.s));
|
|
try!(self.print_block(blk));
|
|
self.print_else(elseopt)
|
|
}
|
|
|
|
pub fn print_mac(&mut self, m: &ast::Mac, delim: token::DelimToken)
|
|
-> io::Result<()> {
|
|
match m.node {
|
|
// I think it's reasonable to hide the ctxt here:
|
|
ast::MacInvocTT(ref pth, ref tts, _) => {
|
|
try!(self.print_path(pth, false, 0));
|
|
try!(word(&mut self.s, "!"));
|
|
match delim {
|
|
token::Paren => try!(self.popen()),
|
|
token::Bracket => try!(word(&mut self.s, "[")),
|
|
token::Brace => try!(self.bopen()),
|
|
}
|
|
try!(self.print_tts(tts));
|
|
match delim {
|
|
token::Paren => self.pclose(),
|
|
token::Bracket => word(&mut self.s, "]"),
|
|
token::Brace => self.bclose(m.span),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
fn print_call_post(&mut self, args: &[P<ast::Expr>]) -> io::Result<()> {
|
|
try!(self.popen());
|
|
try!(self.commasep_exprs(Inconsistent, args));
|
|
self.pclose()
|
|
}
|
|
|
|
pub fn print_expr_maybe_paren(&mut self, expr: &ast::Expr) -> io::Result<()> {
|
|
let needs_par = needs_parentheses(expr);
|
|
if needs_par {
|
|
try!(self.popen());
|
|
}
|
|
try!(self.print_expr(expr));
|
|
if needs_par {
|
|
try!(self.pclose());
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
fn print_expr_box(&mut self,
|
|
place: &Option<P<ast::Expr>>,
|
|
expr: &ast::Expr) -> io::Result<()> {
|
|
try!(word(&mut self.s, "box"));
|
|
try!(word(&mut self.s, "("));
|
|
try!(place.as_ref().map_or(Ok(()), |e|self.print_expr(&**e)));
|
|
try!(self.word_space(")"));
|
|
self.print_expr(expr)
|
|
}
|
|
|
|
fn print_expr_vec(&mut self, exprs: &[P<ast::Expr>]) -> io::Result<()> {
|
|
try!(self.ibox(indent_unit));
|
|
try!(word(&mut self.s, "["));
|
|
try!(self.commasep_exprs(Inconsistent, &exprs[..]));
|
|
try!(word(&mut self.s, "]"));
|
|
self.end()
|
|
}
|
|
|
|
fn print_expr_repeat(&mut self,
|
|
element: &ast::Expr,
|
|
count: &ast::Expr) -> io::Result<()> {
|
|
try!(self.ibox(indent_unit));
|
|
try!(word(&mut self.s, "["));
|
|
try!(self.print_expr(element));
|
|
try!(self.word_space(";"));
|
|
try!(self.print_expr(count));
|
|
try!(word(&mut self.s, "]"));
|
|
self.end()
|
|
}
|
|
|
|
fn print_expr_struct(&mut self,
|
|
path: &ast::Path,
|
|
fields: &[ast::Field],
|
|
wth: &Option<P<ast::Expr>>) -> io::Result<()> {
|
|
try!(self.print_path(path, true, 0));
|
|
if !(fields.is_empty() && wth.is_none()) {
|
|
try!(word(&mut self.s, "{"));
|
|
try!(self.commasep_cmnt(
|
|
Consistent,
|
|
&fields[..],
|
|
|s, field| {
|
|
try!(s.ibox(indent_unit));
|
|
try!(s.print_ident(field.ident.node));
|
|
try!(s.word_space(":"));
|
|
try!(s.print_expr(&*field.expr));
|
|
s.end()
|
|
},
|
|
|f| f.span));
|
|
match *wth {
|
|
Some(ref expr) => {
|
|
try!(self.ibox(indent_unit));
|
|
if !fields.is_empty() {
|
|
try!(word(&mut self.s, ","));
|
|
try!(space(&mut self.s));
|
|
}
|
|
try!(word(&mut self.s, ".."));
|
|
try!(self.print_expr(&**expr));
|
|
try!(self.end());
|
|
}
|
|
_ => try!(word(&mut self.s, ",")),
|
|
}
|
|
try!(word(&mut self.s, "}"));
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
fn print_expr_tup(&mut self, exprs: &[P<ast::Expr>]) -> io::Result<()> {
|
|
try!(self.popen());
|
|
try!(self.commasep_exprs(Inconsistent, &exprs[..]));
|
|
if exprs.len() == 1 {
|
|
try!(word(&mut self.s, ","));
|
|
}
|
|
self.pclose()
|
|
}
|
|
|
|
fn print_expr_call(&mut self,
|
|
func: &ast::Expr,
|
|
args: &[P<ast::Expr>]) -> io::Result<()> {
|
|
try!(self.print_expr_maybe_paren(func));
|
|
self.print_call_post(args)
|
|
}
|
|
|
|
fn print_expr_method_call(&mut self,
|
|
ident: ast::SpannedIdent,
|
|
tys: &[P<ast::Ty>],
|
|
args: &[P<ast::Expr>]) -> io::Result<()> {
|
|
let base_args = &args[1..];
|
|
try!(self.print_expr(&*args[0]));
|
|
try!(word(&mut self.s, "."));
|
|
try!(self.print_ident(ident.node));
|
|
if !tys.is_empty() {
|
|
try!(word(&mut self.s, "::<"));
|
|
try!(self.commasep(Inconsistent, tys,
|
|
|s, ty| s.print_type(&**ty)));
|
|
try!(word(&mut self.s, ">"));
|
|
}
|
|
self.print_call_post(base_args)
|
|
}
|
|
|
|
fn print_expr_binary(&mut self,
|
|
op: ast::BinOp,
|
|
lhs: &ast::Expr,
|
|
rhs: &ast::Expr) -> io::Result<()> {
|
|
try!(self.print_expr(lhs));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space(ast_util::binop_to_string(op.node)));
|
|
self.print_expr(rhs)
|
|
}
|
|
|
|
fn print_expr_unary(&mut self,
|
|
op: ast::UnOp,
|
|
expr: &ast::Expr) -> io::Result<()> {
|
|
try!(word(&mut self.s, ast_util::unop_to_string(op)));
|
|
self.print_expr_maybe_paren(expr)
|
|
}
|
|
|
|
fn print_expr_addr_of(&mut self,
|
|
mutability: ast::Mutability,
|
|
expr: &ast::Expr) -> io::Result<()> {
|
|
try!(word(&mut self.s, "&"));
|
|
try!(self.print_mutability(mutability));
|
|
self.print_expr_maybe_paren(expr)
|
|
}
|
|
|
|
pub fn print_expr(&mut self, expr: &ast::Expr) -> io::Result<()> {
|
|
try!(self.maybe_print_comment(expr.span.lo));
|
|
try!(self.ibox(indent_unit));
|
|
try!(self.ann.pre(self, NodeExpr(expr)));
|
|
match expr.node {
|
|
ast::ExprBox(ref place, ref expr) => {
|
|
try!(self.print_expr_box(place, &**expr));
|
|
}
|
|
ast::ExprVec(ref exprs) => {
|
|
try!(self.print_expr_vec(&exprs[..]));
|
|
}
|
|
ast::ExprRepeat(ref element, ref count) => {
|
|
try!(self.print_expr_repeat(&**element, &**count));
|
|
}
|
|
ast::ExprStruct(ref path, ref fields, ref wth) => {
|
|
try!(self.print_expr_struct(path, &fields[..], wth));
|
|
}
|
|
ast::ExprTup(ref exprs) => {
|
|
try!(self.print_expr_tup(&exprs[..]));
|
|
}
|
|
ast::ExprCall(ref func, ref args) => {
|
|
try!(self.print_expr_call(&**func, &args[..]));
|
|
}
|
|
ast::ExprMethodCall(ident, ref tys, ref args) => {
|
|
try!(self.print_expr_method_call(ident, &tys[..], &args[..]));
|
|
}
|
|
ast::ExprBinary(op, ref lhs, ref rhs) => {
|
|
try!(self.print_expr_binary(op, &**lhs, &**rhs));
|
|
}
|
|
ast::ExprUnary(op, ref expr) => {
|
|
try!(self.print_expr_unary(op, &**expr));
|
|
}
|
|
ast::ExprAddrOf(m, ref expr) => {
|
|
try!(self.print_expr_addr_of(m, &**expr));
|
|
}
|
|
ast::ExprLit(ref lit) => {
|
|
try!(self.print_literal(&**lit));
|
|
}
|
|
ast::ExprCast(ref expr, ref ty) => {
|
|
try!(self.print_expr(&**expr));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("as"));
|
|
try!(self.print_type(&**ty));
|
|
}
|
|
ast::ExprIf(ref test, ref blk, ref elseopt) => {
|
|
try!(self.print_if(&**test, &**blk, elseopt.as_ref().map(|e| &**e)));
|
|
}
|
|
ast::ExprIfLet(ref pat, ref expr, ref blk, ref elseopt) => {
|
|
try!(self.print_if_let(&**pat, &**expr, &** blk, elseopt.as_ref().map(|e| &**e)));
|
|
}
|
|
ast::ExprWhile(ref test, ref blk, opt_ident) => {
|
|
if let Some(ident) = opt_ident {
|
|
try!(self.print_ident(ident));
|
|
try!(self.word_space(":"));
|
|
}
|
|
try!(self.head("while"));
|
|
try!(self.print_expr(&**test));
|
|
try!(space(&mut self.s));
|
|
try!(self.print_block(&**blk));
|
|
}
|
|
ast::ExprWhileLet(ref pat, ref expr, ref blk, opt_ident) => {
|
|
if let Some(ident) = opt_ident {
|
|
try!(self.print_ident(ident));
|
|
try!(self.word_space(":"));
|
|
}
|
|
try!(self.head("while let"));
|
|
try!(self.print_pat(&**pat));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("="));
|
|
try!(self.print_expr(&**expr));
|
|
try!(space(&mut self.s));
|
|
try!(self.print_block(&**blk));
|
|
}
|
|
ast::ExprForLoop(ref pat, ref iter, ref blk, opt_ident) => {
|
|
if let Some(ident) = opt_ident {
|
|
try!(self.print_ident(ident));
|
|
try!(self.word_space(":"));
|
|
}
|
|
try!(self.head("for"));
|
|
try!(self.print_pat(&**pat));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("in"));
|
|
try!(self.print_expr(&**iter));
|
|
try!(space(&mut self.s));
|
|
try!(self.print_block(&**blk));
|
|
}
|
|
ast::ExprLoop(ref blk, opt_ident) => {
|
|
if let Some(ident) = opt_ident {
|
|
try!(self.print_ident(ident));
|
|
try!(self.word_space(":"));
|
|
}
|
|
try!(self.head("loop"));
|
|
try!(space(&mut self.s));
|
|
try!(self.print_block(&**blk));
|
|
}
|
|
ast::ExprMatch(ref expr, ref arms, _) => {
|
|
try!(self.cbox(indent_unit));
|
|
try!(self.ibox(4));
|
|
try!(self.word_nbsp("match"));
|
|
try!(self.print_expr(&**expr));
|
|
try!(space(&mut self.s));
|
|
try!(self.bopen());
|
|
for arm in arms {
|
|
try!(self.print_arm(arm));
|
|
}
|
|
try!(self.bclose_(expr.span, indent_unit));
|
|
}
|
|
ast::ExprClosure(capture_clause, ref decl, ref body) => {
|
|
try!(self.print_capture_clause(capture_clause));
|
|
|
|
try!(self.print_fn_block_args(&**decl));
|
|
try!(space(&mut self.s));
|
|
|
|
let default_return = match decl.output {
|
|
ast::DefaultReturn(..) => true,
|
|
_ => false
|
|
};
|
|
|
|
if !default_return || !body.stmts.is_empty() || body.expr.is_none() {
|
|
try!(self.print_block_unclosed(&**body));
|
|
} else {
|
|
// we extract the block, so as not to create another set of boxes
|
|
match body.expr.as_ref().unwrap().node {
|
|
ast::ExprBlock(ref blk) => {
|
|
try!(self.print_block_unclosed(&**blk));
|
|
}
|
|
_ => {
|
|
// this is a bare expression
|
|
try!(self.print_expr(body.expr.as_ref().map(|e| &**e).unwrap()));
|
|
try!(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.
|
|
try!(self.ibox(0));
|
|
}
|
|
ast::ExprBlock(ref blk) => {
|
|
// containing cbox, will be closed by print-block at }
|
|
try!(self.cbox(indent_unit));
|
|
// head-box, will be closed by print-block after {
|
|
try!(self.ibox(0));
|
|
try!(self.print_block(&**blk));
|
|
}
|
|
ast::ExprAssign(ref lhs, ref rhs) => {
|
|
try!(self.print_expr(&**lhs));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("="));
|
|
try!(self.print_expr(&**rhs));
|
|
}
|
|
ast::ExprAssignOp(op, ref lhs, ref rhs) => {
|
|
try!(self.print_expr(&**lhs));
|
|
try!(space(&mut self.s));
|
|
try!(word(&mut self.s, ast_util::binop_to_string(op.node)));
|
|
try!(self.word_space("="));
|
|
try!(self.print_expr(&**rhs));
|
|
}
|
|
ast::ExprField(ref expr, id) => {
|
|
try!(self.print_expr(&**expr));
|
|
try!(word(&mut self.s, "."));
|
|
try!(self.print_ident(id.node));
|
|
}
|
|
ast::ExprTupField(ref expr, id) => {
|
|
try!(self.print_expr(&**expr));
|
|
try!(word(&mut self.s, "."));
|
|
try!(self.print_usize(id.node));
|
|
}
|
|
ast::ExprIndex(ref expr, ref index) => {
|
|
try!(self.print_expr(&**expr));
|
|
try!(word(&mut self.s, "["));
|
|
try!(self.print_expr(&**index));
|
|
try!(word(&mut self.s, "]"));
|
|
}
|
|
ast::ExprRange(ref start, ref end) => {
|
|
if let &Some(ref e) = start {
|
|
try!(self.print_expr(&**e));
|
|
}
|
|
try!(word(&mut self.s, ".."));
|
|
if let &Some(ref e) = end {
|
|
try!(self.print_expr(&**e));
|
|
}
|
|
}
|
|
ast::ExprPath(None, ref path) => {
|
|
try!(self.print_path(path, true, 0))
|
|
}
|
|
ast::ExprPath(Some(ref qself), ref path) => {
|
|
try!(self.print_qpath(path, qself, true))
|
|
}
|
|
ast::ExprBreak(opt_ident) => {
|
|
try!(word(&mut self.s, "break"));
|
|
try!(space(&mut self.s));
|
|
if let Some(ident) = opt_ident {
|
|
try!(self.print_ident(ident));
|
|
try!(space(&mut self.s));
|
|
}
|
|
}
|
|
ast::ExprAgain(opt_ident) => {
|
|
try!(word(&mut self.s, "continue"));
|
|
try!(space(&mut self.s));
|
|
if let Some(ident) = opt_ident {
|
|
try!(self.print_ident(ident));
|
|
try!(space(&mut self.s))
|
|
}
|
|
}
|
|
ast::ExprRet(ref result) => {
|
|
try!(word(&mut self.s, "return"));
|
|
match *result {
|
|
Some(ref expr) => {
|
|
try!(word(&mut self.s, " "));
|
|
try!(self.print_expr(&**expr));
|
|
}
|
|
_ => ()
|
|
}
|
|
}
|
|
ast::ExprInlineAsm(ref a) => {
|
|
try!(word(&mut self.s, "asm!"));
|
|
try!(self.popen());
|
|
try!(self.print_string(&a.asm, a.asm_str_style));
|
|
try!(self.word_space(":"));
|
|
|
|
try!(self.commasep(Inconsistent, &a.outputs,
|
|
|s, &(ref co, ref o, is_rw)| {
|
|
match co.slice_shift_char() {
|
|
Some(('=', operand)) if is_rw => {
|
|
try!(s.print_string(&format!("+{}", operand),
|
|
ast::CookedStr))
|
|
}
|
|
_ => try!(s.print_string(&co, ast::CookedStr))
|
|
}
|
|
try!(s.popen());
|
|
try!(s.print_expr(&**o));
|
|
try!(s.pclose());
|
|
Ok(())
|
|
}));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space(":"));
|
|
|
|
try!(self.commasep(Inconsistent, &a.inputs,
|
|
|s, &(ref co, ref o)| {
|
|
try!(s.print_string(&co, ast::CookedStr));
|
|
try!(s.popen());
|
|
try!(s.print_expr(&**o));
|
|
try!(s.pclose());
|
|
Ok(())
|
|
}));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space(":"));
|
|
|
|
try!(self.commasep(Inconsistent, &a.clobbers,
|
|
|s, co| {
|
|
try!(s.print_string(&co, ast::CookedStr));
|
|
Ok(())
|
|
}));
|
|
|
|
let mut options = vec!();
|
|
if a.volatile {
|
|
options.push("volatile");
|
|
}
|
|
if a.alignstack {
|
|
options.push("alignstack");
|
|
}
|
|
if a.dialect == ast::AsmDialect::AsmIntel {
|
|
options.push("intel");
|
|
}
|
|
|
|
if !options.is_empty() {
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space(":"));
|
|
try!(self.commasep(Inconsistent, &*options,
|
|
|s, &co| {
|
|
try!(s.print_string(co, ast::CookedStr));
|
|
Ok(())
|
|
}));
|
|
}
|
|
|
|
try!(self.pclose());
|
|
}
|
|
ast::ExprMac(ref m) => try!(self.print_mac(m, token::Paren)),
|
|
ast::ExprParen(ref e) => {
|
|
try!(self.popen());
|
|
try!(self.print_expr(&**e));
|
|
try!(self.pclose());
|
|
}
|
|
}
|
|
try!(self.ann.post(self, NodeExpr(expr)));
|
|
self.end()
|
|
}
|
|
|
|
pub fn print_local_decl(&mut self, loc: &ast::Local) -> io::Result<()> {
|
|
try!(self.print_pat(&*loc.pat));
|
|
if let Some(ref ty) = loc.ty {
|
|
try!(self.word_space(":"));
|
|
try!(self.print_type(&**ty));
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_decl(&mut self, decl: &ast::Decl) -> io::Result<()> {
|
|
try!(self.maybe_print_comment(decl.span.lo));
|
|
match decl.node {
|
|
ast::DeclLocal(ref loc) => {
|
|
try!(self.space_if_not_bol());
|
|
try!(self.ibox(indent_unit));
|
|
try!(self.word_nbsp("let"));
|
|
|
|
try!(self.ibox(indent_unit));
|
|
try!(self.print_local_decl(&**loc));
|
|
try!(self.end());
|
|
if let Some(ref init) = loc.init {
|
|
try!(self.nbsp());
|
|
try!(self.word_space("="));
|
|
try!(self.print_expr(&**init));
|
|
}
|
|
self.end()
|
|
}
|
|
ast::DeclItem(ref item) => self.print_item(&**item)
|
|
}
|
|
}
|
|
|
|
pub fn print_ident(&mut self, ident: ast::Ident) -> io::Result<()> {
|
|
try!(word(&mut self.s, &token::get_ident(ident)));
|
|
self.ann.post(self, NodeIdent(&ident))
|
|
}
|
|
|
|
pub fn print_usize(&mut self, i: usize) -> io::Result<()> {
|
|
word(&mut self.s, &i.to_string())
|
|
}
|
|
|
|
pub fn print_name(&mut self, name: ast::Name) -> io::Result<()> {
|
|
try!(word(&mut self.s, &token::get_name(name)));
|
|
self.ann.post(self, NodeName(&name))
|
|
}
|
|
|
|
pub fn print_for_decl(&mut self, loc: &ast::Local,
|
|
coll: &ast::Expr) -> io::Result<()> {
|
|
try!(self.print_local_decl(loc));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("in"));
|
|
self.print_expr(coll)
|
|
}
|
|
|
|
fn print_path(&mut self,
|
|
path: &ast::Path,
|
|
colons_before_params: bool,
|
|
depth: usize)
|
|
-> io::Result<()>
|
|
{
|
|
try!(self.maybe_print_comment(path.span.lo));
|
|
|
|
let mut first = !path.global;
|
|
for segment in &path.segments[..path.segments.len()-depth] {
|
|
if first {
|
|
first = false
|
|
} else {
|
|
try!(word(&mut self.s, "::"))
|
|
}
|
|
|
|
try!(self.print_ident(segment.identifier));
|
|
|
|
try!(self.print_path_parameters(&segment.parameters, colons_before_params));
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
fn print_qpath(&mut self,
|
|
path: &ast::Path,
|
|
qself: &ast::QSelf,
|
|
colons_before_params: bool)
|
|
-> io::Result<()>
|
|
{
|
|
try!(word(&mut self.s, "<"));
|
|
try!(self.print_type(&qself.ty));
|
|
if qself.position > 0 {
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("as"));
|
|
let depth = path.segments.len() - qself.position;
|
|
try!(self.print_path(&path, false, depth));
|
|
}
|
|
try!(word(&mut self.s, ">"));
|
|
try!(word(&mut self.s, "::"));
|
|
let item_segment = path.segments.last().unwrap();
|
|
try!(self.print_ident(item_segment.identifier));
|
|
self.print_path_parameters(&item_segment.parameters, colons_before_params)
|
|
}
|
|
|
|
fn print_path_parameters(&mut self,
|
|
parameters: &ast::PathParameters,
|
|
colons_before_params: bool)
|
|
-> io::Result<()>
|
|
{
|
|
if parameters.is_empty() {
|
|
return Ok(());
|
|
}
|
|
|
|
if colons_before_params {
|
|
try!(word(&mut self.s, "::"))
|
|
}
|
|
|
|
match *parameters {
|
|
ast::AngleBracketedParameters(ref data) => {
|
|
try!(word(&mut self.s, "<"));
|
|
|
|
let mut comma = false;
|
|
for lifetime in &data.lifetimes {
|
|
if comma {
|
|
try!(self.word_space(","))
|
|
}
|
|
try!(self.print_lifetime(lifetime));
|
|
comma = true;
|
|
}
|
|
|
|
if !data.types.is_empty() {
|
|
if comma {
|
|
try!(self.word_space(","))
|
|
}
|
|
try!(self.commasep(
|
|
Inconsistent,
|
|
&data.types,
|
|
|s, ty| s.print_type(&**ty)));
|
|
comma = true;
|
|
}
|
|
|
|
for binding in &*data.bindings {
|
|
if comma {
|
|
try!(self.word_space(","))
|
|
}
|
|
try!(self.print_ident(binding.ident));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("="));
|
|
try!(self.print_type(&*binding.ty));
|
|
comma = true;
|
|
}
|
|
|
|
try!(word(&mut self.s, ">"))
|
|
}
|
|
|
|
ast::ParenthesizedParameters(ref data) => {
|
|
try!(word(&mut self.s, "("));
|
|
try!(self.commasep(
|
|
Inconsistent,
|
|
&data.inputs,
|
|
|s, ty| s.print_type(&**ty)));
|
|
try!(word(&mut self.s, ")"));
|
|
|
|
match data.output {
|
|
None => { }
|
|
Some(ref ty) => {
|
|
try!(self.space_if_not_bol());
|
|
try!(self.word_space("->"));
|
|
try!(self.print_type(&**ty));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_pat(&mut self, pat: &ast::Pat) -> io::Result<()> {
|
|
try!(self.maybe_print_comment(pat.span.lo));
|
|
try!(self.ann.pre(self, NodePat(pat)));
|
|
/* Pat isn't normalized, but the beauty of it
|
|
is that it doesn't matter */
|
|
match pat.node {
|
|
ast::PatWild(ast::PatWildSingle) => try!(word(&mut self.s, "_")),
|
|
ast::PatWild(ast::PatWildMulti) => try!(word(&mut self.s, "..")),
|
|
ast::PatIdent(binding_mode, ref path1, ref sub) => {
|
|
match binding_mode {
|
|
ast::BindByRef(mutbl) => {
|
|
try!(self.word_nbsp("ref"));
|
|
try!(self.print_mutability(mutbl));
|
|
}
|
|
ast::BindByValue(ast::MutImmutable) => {}
|
|
ast::BindByValue(ast::MutMutable) => {
|
|
try!(self.word_nbsp("mut"));
|
|
}
|
|
}
|
|
try!(self.print_ident(path1.node));
|
|
match *sub {
|
|
Some(ref p) => {
|
|
try!(word(&mut self.s, "@"));
|
|
try!(self.print_pat(&**p));
|
|
}
|
|
None => ()
|
|
}
|
|
}
|
|
ast::PatEnum(ref path, ref args_) => {
|
|
try!(self.print_path(path, true, 0));
|
|
match *args_ {
|
|
None => try!(word(&mut self.s, "(..)")),
|
|
Some(ref args) => {
|
|
if !args.is_empty() {
|
|
try!(self.popen());
|
|
try!(self.commasep(Inconsistent, &args[..],
|
|
|s, p| s.print_pat(&**p)));
|
|
try!(self.pclose());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
ast::PatQPath(ref qself, ref path) => {
|
|
try!(self.print_qpath(path, qself, false));
|
|
}
|
|
ast::PatStruct(ref path, ref fields, etc) => {
|
|
try!(self.print_path(path, true, 0));
|
|
try!(self.nbsp());
|
|
try!(self.word_space("{"));
|
|
try!(self.commasep_cmnt(
|
|
Consistent, &fields[..],
|
|
|s, f| {
|
|
try!(s.cbox(indent_unit));
|
|
if !f.node.is_shorthand {
|
|
try!(s.print_ident(f.node.ident));
|
|
try!(s.word_nbsp(":"));
|
|
}
|
|
try!(s.print_pat(&*f.node.pat));
|
|
s.end()
|
|
},
|
|
|f| f.node.pat.span));
|
|
if etc {
|
|
if !fields.is_empty() { try!(self.word_space(",")); }
|
|
try!(word(&mut self.s, ".."));
|
|
}
|
|
try!(space(&mut self.s));
|
|
try!(word(&mut self.s, "}"));
|
|
}
|
|
ast::PatTup(ref elts) => {
|
|
try!(self.popen());
|
|
try!(self.commasep(Inconsistent,
|
|
&elts[..],
|
|
|s, p| s.print_pat(&**p)));
|
|
if elts.len() == 1 {
|
|
try!(word(&mut self.s, ","));
|
|
}
|
|
try!(self.pclose());
|
|
}
|
|
ast::PatBox(ref inner) => {
|
|
try!(word(&mut self.s, "box "));
|
|
try!(self.print_pat(&**inner));
|
|
}
|
|
ast::PatRegion(ref inner, mutbl) => {
|
|
try!(word(&mut self.s, "&"));
|
|
if mutbl == ast::MutMutable {
|
|
try!(word(&mut self.s, "mut "));
|
|
}
|
|
try!(self.print_pat(&**inner));
|
|
}
|
|
ast::PatLit(ref e) => try!(self.print_expr(&**e)),
|
|
ast::PatRange(ref begin, ref end) => {
|
|
try!(self.print_expr(&**begin));
|
|
try!(space(&mut self.s));
|
|
try!(word(&mut self.s, "..."));
|
|
try!(self.print_expr(&**end));
|
|
}
|
|
ast::PatVec(ref before, ref slice, ref after) => {
|
|
try!(word(&mut self.s, "["));
|
|
try!(self.commasep(Inconsistent,
|
|
&before[..],
|
|
|s, p| s.print_pat(&**p)));
|
|
if let Some(ref p) = *slice {
|
|
if !before.is_empty() { try!(self.word_space(",")); }
|
|
try!(self.print_pat(&**p));
|
|
match **p {
|
|
ast::Pat { node: ast::PatWild(ast::PatWildMulti), .. } => {
|
|
// this case is handled by print_pat
|
|
}
|
|
_ => try!(word(&mut self.s, "..")),
|
|
}
|
|
if !after.is_empty() { try!(self.word_space(",")); }
|
|
}
|
|
try!(self.commasep(Inconsistent,
|
|
&after[..],
|
|
|s, p| s.print_pat(&**p)));
|
|
try!(word(&mut self.s, "]"));
|
|
}
|
|
ast::PatMac(ref m) => try!(self.print_mac(m, token::Paren)),
|
|
}
|
|
self.ann.post(self, NodePat(pat))
|
|
}
|
|
|
|
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() {
|
|
try!(space(&mut self.s));
|
|
}
|
|
try!(self.cbox(indent_unit));
|
|
try!(self.ibox(0));
|
|
try!(self.print_outer_attributes(&arm.attrs));
|
|
let mut first = true;
|
|
for p in &arm.pats {
|
|
if first {
|
|
first = false;
|
|
} else {
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("|"));
|
|
}
|
|
try!(self.print_pat(&**p));
|
|
}
|
|
try!(space(&mut self.s));
|
|
if let Some(ref e) = arm.guard {
|
|
try!(self.word_space("if"));
|
|
try!(self.print_expr(&**e));
|
|
try!(space(&mut self.s));
|
|
}
|
|
try!(self.word_space("=>"));
|
|
|
|
match arm.body.node {
|
|
ast::ExprBlock(ref blk) => {
|
|
// the block will close the pattern's ibox
|
|
try!(self.print_block_unclosed_indent(&**blk, indent_unit));
|
|
|
|
// If it is a user-provided unsafe block, print a comma after it
|
|
if let ast::UnsafeBlock(ast::UserProvided) = blk.rules {
|
|
try!(word(&mut self.s, ","));
|
|
}
|
|
}
|
|
_ => {
|
|
try!(self.end()); // close the ibox for the pattern
|
|
try!(self.print_expr(&*arm.body));
|
|
try!(word(&mut self.s, ","));
|
|
}
|
|
}
|
|
self.end() // close enclosing cbox
|
|
}
|
|
|
|
// Returns whether it printed anything
|
|
fn print_explicit_self(&mut self,
|
|
explicit_self: &ast::ExplicitSelf_,
|
|
mutbl: ast::Mutability) -> io::Result<bool> {
|
|
try!(self.print_mutability(mutbl));
|
|
match *explicit_self {
|
|
ast::SelfStatic => { return Ok(false); }
|
|
ast::SelfValue(_) => {
|
|
try!(word(&mut self.s, "self"));
|
|
}
|
|
ast::SelfRegion(ref lt, m, _) => {
|
|
try!(word(&mut self.s, "&"));
|
|
try!(self.print_opt_lifetime(lt));
|
|
try!(self.print_mutability(m));
|
|
try!(word(&mut self.s, "self"));
|
|
}
|
|
ast::SelfExplicit(ref typ, _) => {
|
|
try!(word(&mut self.s, "self"));
|
|
try!(self.word_space(":"));
|
|
try!(self.print_type(&**typ));
|
|
}
|
|
}
|
|
return Ok(true);
|
|
}
|
|
|
|
pub fn print_fn(&mut self,
|
|
decl: &ast::FnDecl,
|
|
unsafety: ast::Unsafety,
|
|
constness: ast::Constness,
|
|
abi: abi::Abi,
|
|
name: Option<ast::Ident>,
|
|
generics: &ast::Generics,
|
|
opt_explicit_self: Option<&ast::ExplicitSelf_>,
|
|
vis: ast::Visibility) -> io::Result<()> {
|
|
try!(self.print_fn_header_info(unsafety, constness, abi, vis));
|
|
|
|
if let Some(name) = name {
|
|
try!(self.nbsp());
|
|
try!(self.print_ident(name));
|
|
}
|
|
try!(self.print_generics(generics));
|
|
try!(self.print_fn_args_and_ret(decl, opt_explicit_self));
|
|
self.print_where_clause(&generics.where_clause)
|
|
}
|
|
|
|
pub fn print_fn_args(&mut self, decl: &ast::FnDecl,
|
|
opt_explicit_self: Option<&ast::ExplicitSelf_>)
|
|
-> io::Result<()> {
|
|
// It is unfortunate to duplicate the commasep logic, but we want the
|
|
// self type and the args all in the same box.
|
|
try!(self.rbox(0, Inconsistent));
|
|
let mut first = true;
|
|
if let Some(explicit_self) = opt_explicit_self {
|
|
let m = match explicit_self {
|
|
&ast::SelfStatic => ast::MutImmutable,
|
|
_ => match decl.inputs[0].pat.node {
|
|
ast::PatIdent(ast::BindByValue(m), _, _) => m,
|
|
_ => ast::MutImmutable
|
|
}
|
|
};
|
|
first = !try!(self.print_explicit_self(explicit_self, m));
|
|
}
|
|
|
|
// HACK(eddyb) ignore the separately printed self argument.
|
|
let args = if first {
|
|
&decl.inputs[..]
|
|
} else {
|
|
&decl.inputs[1..]
|
|
};
|
|
|
|
for arg in args {
|
|
if first { first = false; } else { try!(self.word_space(",")); }
|
|
try!(self.print_arg(arg));
|
|
}
|
|
|
|
self.end()
|
|
}
|
|
|
|
pub fn print_fn_args_and_ret(&mut self, decl: &ast::FnDecl,
|
|
opt_explicit_self: Option<&ast::ExplicitSelf_>)
|
|
-> io::Result<()> {
|
|
try!(self.popen());
|
|
try!(self.print_fn_args(decl, opt_explicit_self));
|
|
if decl.variadic {
|
|
try!(word(&mut self.s, ", ..."));
|
|
}
|
|
try!(self.pclose());
|
|
|
|
self.print_fn_output(decl)
|
|
}
|
|
|
|
pub fn print_fn_block_args(
|
|
&mut self,
|
|
decl: &ast::FnDecl)
|
|
-> io::Result<()> {
|
|
try!(word(&mut self.s, "|"));
|
|
try!(self.print_fn_args(decl, None));
|
|
try!(word(&mut self.s, "|"));
|
|
|
|
if let ast::DefaultReturn(..) = decl.output {
|
|
return Ok(());
|
|
}
|
|
|
|
try!(self.space_if_not_bol());
|
|
try!(self.word_space("->"));
|
|
match decl.output {
|
|
ast::Return(ref ty) => {
|
|
try!(self.print_type(&**ty));
|
|
self.maybe_print_comment(ty.span.lo)
|
|
}
|
|
ast::DefaultReturn(..) => unreachable!(),
|
|
ast::NoReturn(span) => {
|
|
try!(self.word_nbsp("!"));
|
|
self.maybe_print_comment(span.lo)
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn print_capture_clause(&mut self, capture_clause: ast::CaptureClause)
|
|
-> io::Result<()> {
|
|
match capture_clause {
|
|
ast::CaptureByValue => self.word_space("move"),
|
|
ast::CaptureByRef => Ok(()),
|
|
}
|
|
}
|
|
|
|
pub fn print_bounds(&mut self,
|
|
prefix: &str,
|
|
bounds: &[ast::TyParamBound])
|
|
-> io::Result<()> {
|
|
if !bounds.is_empty() {
|
|
try!(word(&mut self.s, prefix));
|
|
let mut first = true;
|
|
for bound in bounds {
|
|
try!(self.nbsp());
|
|
if first {
|
|
first = false;
|
|
} else {
|
|
try!(self.word_space("+"));
|
|
}
|
|
|
|
try!(match *bound {
|
|
TraitTyParamBound(ref tref, TraitBoundModifier::None) => {
|
|
self.print_poly_trait_ref(tref)
|
|
}
|
|
TraitTyParamBound(ref tref, TraitBoundModifier::Maybe) => {
|
|
try!(word(&mut self.s, "?"));
|
|
self.print_poly_trait_ref(tref)
|
|
}
|
|
RegionTyParamBound(ref lt) => {
|
|
self.print_lifetime(lt)
|
|
}
|
|
})
|
|
}
|
|
Ok(())
|
|
} else {
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
pub fn print_lifetime(&mut self,
|
|
lifetime: &ast::Lifetime)
|
|
-> io::Result<()>
|
|
{
|
|
self.print_name(lifetime.name)
|
|
}
|
|
|
|
pub fn print_lifetime_def(&mut self,
|
|
lifetime: &ast::LifetimeDef)
|
|
-> io::Result<()>
|
|
{
|
|
try!(self.print_lifetime(&lifetime.lifetime));
|
|
let mut sep = ":";
|
|
for v in &lifetime.bounds {
|
|
try!(word(&mut self.s, sep));
|
|
try!(self.print_lifetime(v));
|
|
sep = "+";
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_generics(&mut self,
|
|
generics: &ast::Generics)
|
|
-> io::Result<()>
|
|
{
|
|
let total = generics.lifetimes.len() + generics.ty_params.len();
|
|
if total == 0 {
|
|
return Ok(());
|
|
}
|
|
|
|
try!(word(&mut self.s, "<"));
|
|
|
|
let mut ints = Vec::new();
|
|
for i in 0..total {
|
|
ints.push(i);
|
|
}
|
|
|
|
try!(self.commasep(Inconsistent, &ints[..], |s, &idx| {
|
|
if idx < generics.lifetimes.len() {
|
|
let lifetime = &generics.lifetimes[idx];
|
|
s.print_lifetime_def(lifetime)
|
|
} else {
|
|
let idx = idx - generics.lifetimes.len();
|
|
let param = &generics.ty_params[idx];
|
|
s.print_ty_param(param)
|
|
}
|
|
}));
|
|
|
|
try!(word(&mut self.s, ">"));
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_ty_param(&mut self, param: &ast::TyParam) -> io::Result<()> {
|
|
try!(self.print_ident(param.ident));
|
|
try!(self.print_bounds(":", ¶m.bounds));
|
|
match param.default {
|
|
Some(ref default) => {
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("="));
|
|
self.print_type(&**default)
|
|
}
|
|
_ => Ok(())
|
|
}
|
|
}
|
|
|
|
pub fn print_where_clause(&mut self, where_clause: &ast::WhereClause)
|
|
-> io::Result<()> {
|
|
if where_clause.predicates.is_empty() {
|
|
return Ok(())
|
|
}
|
|
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("where"));
|
|
|
|
for (i, predicate) in where_clause.predicates.iter().enumerate() {
|
|
if i != 0 {
|
|
try!(self.word_space(","));
|
|
}
|
|
|
|
match predicate {
|
|
&ast::WherePredicate::BoundPredicate(ast::WhereBoundPredicate{ref bound_lifetimes,
|
|
ref bounded_ty,
|
|
ref bounds,
|
|
..}) => {
|
|
try!(self.print_formal_lifetime_list(bound_lifetimes));
|
|
try!(self.print_type(&**bounded_ty));
|
|
try!(self.print_bounds(":", bounds));
|
|
}
|
|
&ast::WherePredicate::RegionPredicate(ast::WhereRegionPredicate{ref lifetime,
|
|
ref bounds,
|
|
..}) => {
|
|
try!(self.print_lifetime(lifetime));
|
|
try!(word(&mut self.s, ":"));
|
|
|
|
for (i, bound) in bounds.iter().enumerate() {
|
|
try!(self.print_lifetime(bound));
|
|
|
|
if i != 0 {
|
|
try!(word(&mut self.s, ":"));
|
|
}
|
|
}
|
|
}
|
|
&ast::WherePredicate::EqPredicate(ast::WhereEqPredicate{ref path, ref ty, ..}) => {
|
|
try!(self.print_path(path, false, 0));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("="));
|
|
try!(self.print_type(&**ty));
|
|
}
|
|
}
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_meta_item(&mut self, item: &ast::MetaItem) -> io::Result<()> {
|
|
try!(self.ibox(indent_unit));
|
|
match item.node {
|
|
ast::MetaWord(ref name) => {
|
|
try!(word(&mut self.s, &name));
|
|
}
|
|
ast::MetaNameValue(ref name, ref value) => {
|
|
try!(self.word_space(&name[..]));
|
|
try!(self.word_space("="));
|
|
try!(self.print_literal(value));
|
|
}
|
|
ast::MetaList(ref name, ref items) => {
|
|
try!(word(&mut self.s, &name));
|
|
try!(self.popen());
|
|
try!(self.commasep(Consistent,
|
|
&items[..],
|
|
|s, i| s.print_meta_item(&**i)));
|
|
try!(self.pclose());
|
|
}
|
|
}
|
|
self.end()
|
|
}
|
|
|
|
pub fn print_view_path(&mut self, vp: &ast::ViewPath) -> io::Result<()> {
|
|
match vp.node {
|
|
ast::ViewPathSimple(ident, ref path) => {
|
|
try!(self.print_path(path, false, 0));
|
|
|
|
// FIXME(#6993) can't compare identifiers directly here
|
|
if path.segments.last().unwrap().identifier.name !=
|
|
ident.name {
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("as"));
|
|
try!(self.print_ident(ident));
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
ast::ViewPathGlob(ref path) => {
|
|
try!(self.print_path(path, false, 0));
|
|
word(&mut self.s, "::*")
|
|
}
|
|
|
|
ast::ViewPathList(ref path, ref idents) => {
|
|
if path.segments.is_empty() {
|
|
try!(word(&mut self.s, "{"));
|
|
} else {
|
|
try!(self.print_path(path, false, 0));
|
|
try!(word(&mut self.s, "::{"));
|
|
}
|
|
try!(self.commasep(Inconsistent, &idents[..], |s, w| {
|
|
match w.node {
|
|
ast::PathListIdent { name, .. } => {
|
|
s.print_ident(name)
|
|
},
|
|
ast::PathListMod { .. } => {
|
|
word(&mut s.s, "self")
|
|
}
|
|
}
|
|
}));
|
|
word(&mut self.s, "}")
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn print_mutability(&mut self,
|
|
mutbl: ast::Mutability) -> io::Result<()> {
|
|
match mutbl {
|
|
ast::MutMutable => self.word_nbsp("mut"),
|
|
ast::MutImmutable => Ok(()),
|
|
}
|
|
}
|
|
|
|
pub fn print_mt(&mut self, mt: &ast::MutTy) -> io::Result<()> {
|
|
try!(self.print_mutability(mt.mutbl));
|
|
self.print_type(&*mt.ty)
|
|
}
|
|
|
|
pub fn print_arg(&mut self, input: &ast::Arg) -> io::Result<()> {
|
|
try!(self.ibox(indent_unit));
|
|
match input.ty.node {
|
|
ast::TyInfer => try!(self.print_pat(&*input.pat)),
|
|
_ => {
|
|
match input.pat.node {
|
|
ast::PatIdent(_, ref path1, _) if
|
|
path1.node.name ==
|
|
parse::token::special_idents::invalid.name => {
|
|
// Do nothing.
|
|
}
|
|
_ => {
|
|
try!(self.print_pat(&*input.pat));
|
|
try!(word(&mut self.s, ":"));
|
|
try!(space(&mut self.s));
|
|
}
|
|
}
|
|
try!(self.print_type(&*input.ty));
|
|
}
|
|
}
|
|
self.end()
|
|
}
|
|
|
|
pub fn print_fn_output(&mut self, decl: &ast::FnDecl) -> io::Result<()> {
|
|
if let ast::DefaultReturn(..) = decl.output {
|
|
return Ok(());
|
|
}
|
|
|
|
try!(self.space_if_not_bol());
|
|
try!(self.ibox(indent_unit));
|
|
try!(self.word_space("->"));
|
|
match decl.output {
|
|
ast::NoReturn(_) =>
|
|
try!(self.word_nbsp("!")),
|
|
ast::DefaultReturn(..) => unreachable!(),
|
|
ast::Return(ref ty) =>
|
|
try!(self.print_type(&**ty))
|
|
}
|
|
try!(self.end());
|
|
|
|
match decl.output {
|
|
ast::Return(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>,
|
|
generics: &ast::Generics,
|
|
opt_explicit_self: Option<&ast::ExplicitSelf_>)
|
|
-> io::Result<()> {
|
|
try!(self.ibox(indent_unit));
|
|
if !generics.lifetimes.is_empty() || !generics.ty_params.is_empty() {
|
|
try!(word(&mut self.s, "for"));
|
|
try!(self.print_generics(generics));
|
|
}
|
|
let generics = ast::Generics {
|
|
lifetimes: Vec::new(),
|
|
ty_params: OwnedSlice::empty(),
|
|
where_clause: ast::WhereClause {
|
|
id: ast::DUMMY_NODE_ID,
|
|
predicates: Vec::new(),
|
|
},
|
|
};
|
|
try!(self.print_fn(decl,
|
|
unsafety,
|
|
ast::Constness::NotConst,
|
|
abi,
|
|
name,
|
|
generics,
|
|
opt_explicit_self,
|
|
ast::Inherited));
|
|
self.end()
|
|
}
|
|
|
|
pub fn maybe_print_trailing_comment(&mut self, span: codemap::Span,
|
|
next_pos: Option<BytePos>)
|
|
-> io::Result<()> {
|
|
let cm = match self.cm {
|
|
Some(cm) => cm,
|
|
_ => return Ok(())
|
|
};
|
|
match self.next_comment() {
|
|
Some(ref cmnt) => {
|
|
if (*cmnt).style != comments::Trailing { return Ok(()) }
|
|
let span_line = cm.lookup_char_pos(span.hi);
|
|
let comment_line = cm.lookup_char_pos((*cmnt).pos);
|
|
let mut next = (*cmnt).pos + BytePos(1);
|
|
match next_pos { None => (), Some(p) => next = p }
|
|
if span.hi < (*cmnt).pos && (*cmnt).pos < next &&
|
|
span_line.line == comment_line.line {
|
|
try!(self.print_comment(cmnt));
|
|
self.cur_cmnt_and_lit.cur_cmnt += 1;
|
|
}
|
|
}
|
|
_ => ()
|
|
}
|
|
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() {
|
|
try!(hardbreak(&mut self.s));
|
|
}
|
|
loop {
|
|
match self.next_comment() {
|
|
Some(ref cmnt) => {
|
|
try!(self.print_comment(cmnt));
|
|
self.cur_cmnt_and_lit.cur_cmnt += 1;
|
|
}
|
|
_ => break
|
|
}
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_literal(&mut self, lit: &ast::Lit) -> io::Result<()> {
|
|
try!(self.maybe_print_comment(lit.span.lo));
|
|
match self.next_lit(lit.span.lo) {
|
|
Some(ref ltrl) => {
|
|
return word(&mut self.s, &(*ltrl).lit);
|
|
}
|
|
_ => ()
|
|
}
|
|
match lit.node {
|
|
ast::LitStr(ref st, style) => self.print_string(&st, style),
|
|
ast::LitByte(byte) => {
|
|
let mut res = String::from("b'");
|
|
res.extend(ascii::escape_default(byte).map(|c| c as char));
|
|
res.push('\'');
|
|
word(&mut self.s, &res[..])
|
|
}
|
|
ast::LitChar(ch) => {
|
|
let mut res = String::from("'");
|
|
res.extend(ch.escape_default());
|
|
res.push('\'');
|
|
word(&mut self.s, &res[..])
|
|
}
|
|
ast::LitInt(i, t) => {
|
|
match t {
|
|
ast::SignedIntLit(st, ast::Plus) => {
|
|
word(&mut self.s,
|
|
&ast_util::int_ty_to_string(st, Some(i as i64)))
|
|
}
|
|
ast::SignedIntLit(st, ast::Minus) => {
|
|
let istr = ast_util::int_ty_to_string(st, Some(-(i as i64)));
|
|
word(&mut self.s,
|
|
&format!("-{}", istr))
|
|
}
|
|
ast::UnsignedIntLit(ut) => {
|
|
word(&mut self.s, &ast_util::uint_ty_to_string(ut, Some(i)))
|
|
}
|
|
ast::UnsuffixedIntLit(ast::Plus) => {
|
|
word(&mut self.s, &format!("{}", i))
|
|
}
|
|
ast::UnsuffixedIntLit(ast::Minus) => {
|
|
word(&mut self.s, &format!("-{}", i))
|
|
}
|
|
}
|
|
}
|
|
ast::LitFloat(ref f, t) => {
|
|
word(&mut self.s,
|
|
&format!(
|
|
"{}{}",
|
|
&f,
|
|
&ast_util::float_ty_to_string(t)))
|
|
}
|
|
ast::LitFloatUnsuffixed(ref f) => word(&mut self.s, &f[..]),
|
|
ast::LitBool(val) => {
|
|
if val { word(&mut self.s, "true") } else { word(&mut self.s, "false") }
|
|
}
|
|
ast::LitBinary(ref v) => {
|
|
let mut escaped: String = String::new();
|
|
for &ch in &**v {
|
|
escaped.extend(ascii::escape_default(ch)
|
|
.map(|c| c as char));
|
|
}
|
|
word(&mut self.s, &format!("b\"{}\"", escaped))
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn next_lit(&mut self, pos: BytePos) -> Option<comments::Literal> {
|
|
match self.literals {
|
|
Some(ref lits) => {
|
|
while self.cur_cmnt_and_lit.cur_lit < lits.len() {
|
|
let ltrl = (*lits)[self.cur_cmnt_and_lit.cur_lit].clone();
|
|
if ltrl.pos > pos { return None; }
|
|
self.cur_cmnt_and_lit.cur_lit += 1;
|
|
if ltrl.pos == pos { return Some(ltrl); }
|
|
}
|
|
None
|
|
}
|
|
_ => None
|
|
}
|
|
}
|
|
|
|
pub fn maybe_print_comment(&mut self, pos: BytePos) -> io::Result<()> {
|
|
loop {
|
|
match self.next_comment() {
|
|
Some(ref cmnt) => {
|
|
if (*cmnt).pos < pos {
|
|
try!(self.print_comment(cmnt));
|
|
self.cur_cmnt_and_lit.cur_cmnt += 1;
|
|
} else { break; }
|
|
}
|
|
_ => break
|
|
}
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_comment(&mut self,
|
|
cmnt: &comments::Comment) -> io::Result<()> {
|
|
match cmnt.style {
|
|
comments::Mixed => {
|
|
assert_eq!(cmnt.lines.len(), 1);
|
|
try!(zerobreak(&mut self.s));
|
|
try!(word(&mut self.s, &cmnt.lines[0]));
|
|
zerobreak(&mut self.s)
|
|
}
|
|
comments::Isolated => {
|
|
try!(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() {
|
|
try!(word(&mut self.s, &line[..]));
|
|
}
|
|
try!(hardbreak(&mut self.s));
|
|
}
|
|
Ok(())
|
|
}
|
|
comments::Trailing => {
|
|
try!(word(&mut self.s, " "));
|
|
if cmnt.lines.len() == 1 {
|
|
try!(word(&mut self.s, &cmnt.lines[0]));
|
|
hardbreak(&mut self.s)
|
|
} else {
|
|
try!(self.ibox(0));
|
|
for line in &cmnt.lines {
|
|
if !line.is_empty() {
|
|
try!(word(&mut self.s, &line[..]));
|
|
}
|
|
try!(hardbreak(&mut self.s));
|
|
}
|
|
self.end()
|
|
}
|
|
}
|
|
comments::BlankLine => {
|
|
// We need to do at least one, possibly two hardbreaks.
|
|
let is_semi = match self.s.last_token() {
|
|
pp::Token::String(s, _) => ";" == s,
|
|
_ => false
|
|
};
|
|
if is_semi || self.is_begin() || self.is_end() {
|
|
try!(hardbreak(&mut self.s));
|
|
}
|
|
hardbreak(&mut self.s)
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn print_string(&mut self, st: &str,
|
|
style: ast::StrStyle) -> io::Result<()> {
|
|
let st = match style {
|
|
ast::CookedStr => {
|
|
(format!("\"{}\"", st.escape_default()))
|
|
}
|
|
ast::RawStr(n) => {
|
|
(format!("r{delim}\"{string}\"{delim}",
|
|
delim=repeat("#", n),
|
|
string=st))
|
|
}
|
|
};
|
|
word(&mut self.s, &st[..])
|
|
}
|
|
|
|
pub fn next_comment(&mut self) -> Option<comments::Comment> {
|
|
match self.comments {
|
|
Some(ref cmnts) => {
|
|
if self.cur_cmnt_and_lit.cur_cmnt < cmnts.len() {
|
|
Some(cmnts[self.cur_cmnt_and_lit.cur_cmnt].clone())
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
_ => None
|
|
}
|
|
}
|
|
|
|
pub fn print_opt_abi_and_extern_if_nondefault(&mut self,
|
|
opt_abi: Option<abi::Abi>)
|
|
-> io::Result<()> {
|
|
match opt_abi {
|
|
Some(abi::Rust) => Ok(()),
|
|
Some(abi) => {
|
|
try!(self.word_nbsp("extern"));
|
|
self.word_nbsp(&abi.to_string())
|
|
}
|
|
None => Ok(())
|
|
}
|
|
}
|
|
|
|
pub fn print_extern_opt_abi(&mut self,
|
|
opt_abi: Option<abi::Abi>) -> io::Result<()> {
|
|
match opt_abi {
|
|
Some(abi) => {
|
|
try!(self.word_nbsp("extern"));
|
|
self.word_nbsp(&abi.to_string())
|
|
}
|
|
None => Ok(())
|
|
}
|
|
}
|
|
|
|
pub fn print_fn_header_info(&mut self,
|
|
unsafety: ast::Unsafety,
|
|
constness: ast::Constness,
|
|
abi: abi::Abi,
|
|
vis: ast::Visibility) -> io::Result<()> {
|
|
try!(word(&mut self.s, &visibility_qualified(vis, "")));
|
|
try!(self.print_unsafety(unsafety));
|
|
|
|
match constness {
|
|
ast::Constness::NotConst => {}
|
|
ast::Constness::Const => try!(self.word_nbsp("unsafe"))
|
|
}
|
|
|
|
if abi != abi::Rust {
|
|
try!(self.word_nbsp("extern"));
|
|
try!(self.word_nbsp(&abi.to_string()));
|
|
}
|
|
|
|
word(&mut self.s, "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"),
|
|
}
|
|
}
|
|
}
|
|
|
|
fn repeat(s: &str, n: usize) -> String { iter::repeat(s).take(n).collect() }
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
use ast;
|
|
use ast_util;
|
|
use codemap;
|
|
use parse::token;
|
|
|
|
#[test]
|
|
fn test_fun_to_string() {
|
|
let abba_ident = token::str_to_ident("abba");
|
|
|
|
let decl = ast::FnDecl {
|
|
inputs: Vec::new(),
|
|
output: ast::DefaultReturn(codemap::DUMMY_SP),
|
|
variadic: false
|
|
};
|
|
let generics = ast_util::empty_generics();
|
|
assert_eq!(fun_to_string(&decl, ast::Unsafety::Normal,
|
|
ast::Constness::NotConst,
|
|
abba_ident,
|
|
None, &generics),
|
|
"fn abba()");
|
|
}
|
|
|
|
#[test]
|
|
fn test_variant_to_string() {
|
|
let ident = token::str_to_ident("principal_skinner");
|
|
|
|
let var = codemap::respan(codemap::DUMMY_SP, ast::Variant_ {
|
|
name: ident,
|
|
attrs: Vec::new(),
|
|
// making this up as I go.... ?
|
|
kind: ast::TupleVariantKind(Vec::new()),
|
|
id: 0,
|
|
disr_expr: None,
|
|
vis: ast::Public,
|
|
});
|
|
|
|
let varstr = variant_to_string(&var);
|
|
assert_eq!(varstr, "pub principal_skinner");
|
|
}
|
|
|
|
#[test]
|
|
fn test_signed_int_to_string() {
|
|
let pos_int = ast::LitInt(42, ast::SignedIntLit(ast::TyI32, ast::Plus));
|
|
let neg_int = ast::LitInt((!42 + 1) as u64, ast::SignedIntLit(ast::TyI32, ast::Minus));
|
|
assert_eq!(format!("-{}", lit_to_string(&codemap::dummy_spanned(pos_int))),
|
|
lit_to_string(&codemap::dummy_spanned(neg_int)));
|
|
}
|
|
}
|