db4d60afb0
`slice_shift_char` splits a `str` into it's leading `char` and the remainder of the `str`. Currently, it returns a `(Option<char>, &str)` such that:
"bar".slice_shift_char() => (Some('b'), "ar")
"ar".slice_shift_char() => (Some('a'), "r")
"r".slice_shift_char() => (Some('r'), "")
"".slice_shift_char() => (None, "")
This is a little odd. Either a `str` can be split into both a head and a tail or it cannot. So the return type should be `Option<(char, &str)>`. With the current behaviour, in the case of the empty string, the `str` returned is meaningless - it is always the empty string.
This PR changes `slice_shift_char` so that:
"bar".slice_shift_char() => Some(('b', "ar"))
"ar".slice_shift_char() => Some(('a', "r"))
"r".slice_shift_char() => Some(('r', ""))
"".slice_shift_char() => None
3054 lines
111 KiB
Rust
3054 lines
111 KiB
Rust
// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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pub use self::AnnNode::*;
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use abi;
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use ast::{FnUnboxedClosureKind, FnMutUnboxedClosureKind};
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use ast::{FnOnceUnboxedClosureKind};
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use ast::{MethodImplItem, RegionTyParamBound, TraitTyParamBound};
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use ast::{RequiredMethod, ProvidedMethod, TypeImplItem, TypeTraitItem};
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use ast::{UnboxedClosureKind};
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use ast;
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use ast_util;
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use owned_slice::OwnedSlice;
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use attr::{AttrMetaMethods, AttributeMethods};
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use codemap::{CodeMap, BytePos};
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use codemap;
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use diagnostic;
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use parse::token::{BinOpToken, Token};
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use parse::token;
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use parse::lexer::comments;
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use parse;
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use print::pp::{break_offset, word, space, zerobreak, hardbreak};
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use print::pp::{Breaks, Consistent, Inconsistent, eof};
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use print::pp;
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use ptr::P;
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use std::ascii;
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use std::io::{IoResult, MemWriter};
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use std::io;
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use std::mem;
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pub enum AnnNode<'a> {
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NodeIdent(&'a ast::Ident),
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NodeName(&'a ast::Name),
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NodeBlock(&'a ast::Block),
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NodeItem(&'a ast::Item),
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NodeExpr(&'a ast::Expr),
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NodePat(&'a ast::Pat),
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}
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pub trait PpAnn {
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fn pre(&self, _state: &mut State, _node: AnnNode) -> IoResult<()> { Ok(()) }
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fn post(&self, _state: &mut State, _node: AnnNode) -> IoResult<()> { Ok(()) }
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}
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pub struct NoAnn;
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impl PpAnn for NoAnn {}
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pub struct CurrentCommentAndLiteral {
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cur_cmnt: uint,
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cur_lit: uint,
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}
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pub struct State<'a> {
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pub s: pp::Printer,
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cm: Option<&'a CodeMap>,
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comments: Option<Vec<comments::Comment> >,
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literals: Option<Vec<comments::Literal> >,
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cur_cmnt_and_lit: CurrentCommentAndLiteral,
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boxes: Vec<pp::Breaks>,
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ann: &'a PpAnn+'a,
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encode_idents_with_hygiene: bool,
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}
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pub fn rust_printer(writer: Box<io::Writer+'static>) -> State<'static> {
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static NO_ANN: NoAnn = NoAnn;
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rust_printer_annotated(writer, &NO_ANN)
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}
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pub fn rust_printer_annotated<'a>(writer: Box<io::Writer+'static>,
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ann: &'a PpAnn) -> State<'a> {
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State {
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s: pp::mk_printer(writer, default_columns),
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cm: None,
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comments: None,
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literals: None,
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cur_cmnt_and_lit: CurrentCommentAndLiteral {
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cur_cmnt: 0,
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cur_lit: 0
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},
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boxes: Vec::new(),
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ann: ann,
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encode_idents_with_hygiene: false,
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}
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}
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#[allow(non_upper_case_globals)]
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pub const indent_unit: uint = 4u;
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#[allow(non_upper_case_globals)]
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pub const default_columns: uint = 78u;
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/// Requires you to pass an input filename and reader so that
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/// it can scan the input text for comments and literals to
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/// copy forward.
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pub fn print_crate<'a>(cm: &'a CodeMap,
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span_diagnostic: &diagnostic::SpanHandler,
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krate: &ast::Crate,
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filename: String,
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input: &mut io::Reader,
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out: Box<io::Writer+'static>,
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ann: &'a PpAnn,
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is_expanded: bool) -> IoResult<()> {
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let mut s = State::new_from_input(cm,
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span_diagnostic,
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filename,
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input,
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out,
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ann,
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is_expanded);
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try!(s.print_mod(&krate.module, krate.attrs.as_slice()));
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try!(s.print_remaining_comments());
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eof(&mut s.s)
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}
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impl<'a> State<'a> {
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pub fn new_from_input(cm: &'a CodeMap,
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span_diagnostic: &diagnostic::SpanHandler,
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filename: String,
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input: &mut io::Reader,
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out: Box<io::Writer+'static>,
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ann: &'a PpAnn,
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is_expanded: bool) -> State<'a> {
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let (cmnts, lits) = comments::gather_comments_and_literals(
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span_diagnostic,
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filename,
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input);
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State::new(
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cm,
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out,
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ann,
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Some(cmnts),
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// If the code is post expansion, don't use the table of
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// literals, since it doesn't correspond with the literals
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// in the AST anymore.
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if is_expanded { None } else { Some(lits) })
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}
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pub fn new(cm: &'a CodeMap,
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out: Box<io::Writer+'static>,
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ann: &'a PpAnn,
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comments: Option<Vec<comments::Comment>>,
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literals: Option<Vec<comments::Literal>>) -> State<'a> {
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State {
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s: pp::mk_printer(out, default_columns),
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cm: Some(cm),
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comments: comments,
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literals: literals,
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cur_cmnt_and_lit: CurrentCommentAndLiteral {
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cur_cmnt: 0,
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cur_lit: 0
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},
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boxes: Vec::new(),
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ann: ann,
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encode_idents_with_hygiene: false,
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}
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}
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}
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pub fn to_string(f: |&mut State| -> IoResult<()>) -> String {
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use std::raw::TraitObject;
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let mut s = rust_printer(box MemWriter::new());
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f(&mut s).unwrap();
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eof(&mut s.s).unwrap();
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let wr = unsafe {
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// FIXME(pcwalton): A nasty function to extract the string from an `io::Writer`
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// that we "know" to be a `MemWriter` that works around the lack of checked
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// downcasts.
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let obj: &TraitObject = mem::transmute(&s.s.out);
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mem::transmute::<*mut (), &MemWriter>(obj.data)
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};
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String::from_utf8(wr.get_ref().to_vec()).unwrap()
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}
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pub fn binop_to_string(op: BinOpToken) -> &'static str {
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match op {
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token::Plus => "+",
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token::Minus => "-",
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token::Star => "*",
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token::Slash => "/",
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token::Percent => "%",
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token::Caret => "^",
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token::And => "&",
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token::Or => "|",
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token::Shl => "<<",
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token::Shr => ">>",
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}
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}
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pub fn token_to_string(tok: &Token) -> String {
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match *tok {
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token::Eq => "=".into_string(),
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token::Lt => "<".into_string(),
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token::Le => "<=".into_string(),
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token::EqEq => "==".into_string(),
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token::Ne => "!=".into_string(),
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token::Ge => ">=".into_string(),
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token::Gt => ">".into_string(),
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token::Not => "!".into_string(),
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token::Tilde => "~".into_string(),
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token::OrOr => "||".into_string(),
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token::AndAnd => "&&".into_string(),
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token::BinOp(op) => binop_to_string(op).into_string(),
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token::BinOpEq(op) => format!("{}=", binop_to_string(op)),
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/* Structural symbols */
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token::At => "@".into_string(),
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token::Dot => ".".into_string(),
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token::DotDot => "..".into_string(),
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token::DotDotDot => "...".into_string(),
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token::Comma => ",".into_string(),
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token::Semi => ";".into_string(),
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token::Colon => ":".into_string(),
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token::ModSep => "::".into_string(),
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token::RArrow => "->".into_string(),
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token::LArrow => "<-".into_string(),
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token::FatArrow => "=>".into_string(),
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token::OpenDelim(token::Paren) => "(".into_string(),
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token::CloseDelim(token::Paren) => ")".into_string(),
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token::OpenDelim(token::Bracket) => "[".into_string(),
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token::CloseDelim(token::Bracket) => "]".into_string(),
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token::OpenDelim(token::Brace) => "{".into_string(),
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token::CloseDelim(token::Brace) => "}".into_string(),
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token::Pound => "#".into_string(),
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token::Dollar => "$".into_string(),
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token::Question => "?".into_string(),
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/* Literals */
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token::LitByte(b) => format!("b'{}'", b.as_str()),
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token::LitChar(c) => format!("'{}'", c.as_str()),
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token::LitFloat(c) => c.as_str().into_string(),
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token::LitInteger(c) => c.as_str().into_string(),
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token::LitStr(s) => format!("\"{}\"", s.as_str()),
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token::LitStrRaw(s, n) => format!("r{delim}\"{string}\"{delim}",
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delim="#".repeat(n),
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string=s.as_str()),
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token::LitBinary(v) => format!("b\"{}\"", v.as_str()),
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token::LitBinaryRaw(s, n) => format!("br{delim}\"{string}\"{delim}",
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delim="#".repeat(n),
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string=s.as_str()),
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/* Name components */
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token::Ident(s, _) => token::get_ident(s).get().into_string(),
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token::Lifetime(s) => format!("{}", token::get_ident(s)),
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token::Underscore => "_".into_string(),
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/* Other */
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token::DocComment(s) => s.as_str().into_string(),
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token::SubstNt(s, _) => format!("${}", s),
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token::MatchNt(s, t, _, _) => format!("${}:{}", s, t),
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token::Eof => "<eof>".into_string(),
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token::Whitespace => " ".into_string(),
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token::Comment => "/* */".into_string(),
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token::Shebang(s) => format!("/* shebang: {}*/", s.as_str()),
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token::Interpolated(ref nt) => match *nt {
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token::NtExpr(ref e) => expr_to_string(&**e),
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token::NtMeta(ref e) => meta_item_to_string(&**e),
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token::NtTy(ref e) => ty_to_string(&**e),
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token::NtPath(ref e) => path_to_string(&**e),
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token::NtItem(..) => "an interpolated item".into_string(),
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token::NtBlock(..) => "an interpolated block".into_string(),
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token::NtStmt(..) => "an interpolated statement".into_string(),
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token::NtPat(..) => "an interpolated pattern".into_string(),
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token::NtIdent(..) => "an interpolated identifier".into_string(),
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token::NtTT(..) => "an interpolated tt".into_string(),
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}
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}
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}
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// FIXME (Issue #16472): the thing_to_string_impls macro should go away
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// after we revise the syntax::ext::quote::ToToken impls to go directly
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// to token-trees instead of thing -> string -> token-trees.
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macro_rules! thing_to_string_impls {
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($to_string:ident) => {
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pub fn ty_to_string(ty: &ast::Ty) -> String {
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$to_string(|s| s.print_type(ty))
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}
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pub fn pat_to_string(pat: &ast::Pat) -> String {
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$to_string(|s| s.print_pat(pat))
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}
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pub fn arm_to_string(arm: &ast::Arm) -> String {
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$to_string(|s| s.print_arm(arm))
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}
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pub fn expr_to_string(e: &ast::Expr) -> String {
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$to_string(|s| s.print_expr(e))
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}
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pub fn lifetime_to_string(e: &ast::Lifetime) -> String {
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$to_string(|s| s.print_lifetime(e))
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}
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pub fn tt_to_string(tt: &ast::TokenTree) -> String {
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$to_string(|s| s.print_tt(tt))
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}
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pub fn tts_to_string(tts: &[ast::TokenTree]) -> String {
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$to_string(|s| s.print_tts(tts))
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}
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pub fn stmt_to_string(stmt: &ast::Stmt) -> String {
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$to_string(|s| s.print_stmt(stmt))
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}
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pub fn item_to_string(i: &ast::Item) -> String {
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$to_string(|s| s.print_item(i))
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}
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pub fn view_item_to_string(i: &ast::ViewItem) -> String {
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$to_string(|s| s.print_view_item(i))
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}
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pub fn generics_to_string(generics: &ast::Generics) -> String {
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$to_string(|s| s.print_generics(generics))
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}
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pub fn ty_method_to_string(p: &ast::TypeMethod) -> String {
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$to_string(|s| s.print_ty_method(p))
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}
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pub fn method_to_string(p: &ast::Method) -> String {
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$to_string(|s| s.print_method(p))
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}
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pub fn fn_block_to_string(p: &ast::FnDecl) -> String {
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$to_string(|s| s.print_fn_block_args(p, None))
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}
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pub fn path_to_string(p: &ast::Path) -> String {
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$to_string(|s| s.print_path(p, false))
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}
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pub fn ident_to_string(id: &ast::Ident) -> String {
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$to_string(|s| s.print_ident(*id))
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}
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pub fn fun_to_string(decl: &ast::FnDecl, fn_style: ast::FnStyle, name: ast::Ident,
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opt_explicit_self: Option<&ast::ExplicitSelf_>,
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generics: &ast::Generics) -> String {
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$to_string(|s| {
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try!(s.print_fn(decl, Some(fn_style), abi::Rust,
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name, generics, opt_explicit_self, ast::Inherited));
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try!(s.end()); // Close the head box
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s.end() // Close the outer box
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})
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}
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pub fn block_to_string(blk: &ast::Block) -> String {
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$to_string(|s| {
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// containing cbox, will be closed by print-block at }
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try!(s.cbox(indent_unit));
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// head-ibox, will be closed by print-block after {
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try!(s.ibox(0u));
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s.print_block(blk)
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})
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}
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pub fn meta_item_to_string(mi: &ast::MetaItem) -> String {
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$to_string(|s| s.print_meta_item(mi))
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}
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pub fn attribute_to_string(attr: &ast::Attribute) -> String {
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$to_string(|s| s.print_attribute(attr))
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}
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pub fn lit_to_string(l: &ast::Lit) -> String {
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$to_string(|s| s.print_literal(l))
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}
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pub fn explicit_self_to_string(explicit_self: &ast::ExplicitSelf_) -> String {
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$to_string(|s| s.print_explicit_self(explicit_self, ast::MutImmutable).map(|_| {}))
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}
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pub fn variant_to_string(var: &ast::Variant) -> String {
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$to_string(|s| s.print_variant(var))
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}
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pub fn arg_to_string(arg: &ast::Arg) -> String {
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$to_string(|s| s.print_arg(arg))
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}
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pub fn mac_to_string(arg: &ast::Mac) -> String {
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$to_string(|s| s.print_mac(arg))
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}
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} }
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thing_to_string_impls!(to_string)
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// FIXME (Issue #16472): the whole `with_hygiene` mod should go away
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// after we revise the syntax::ext::quote::ToToken impls to go directly
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// to token-trees instea of thing -> string -> token-trees.
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pub mod with_hygiene {
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use abi;
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use ast;
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use std::io::IoResult;
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use super::indent_unit;
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// This function is the trick that all the rest of the routines
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// hang on.
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pub fn to_string_hyg(f: |&mut super::State| -> IoResult<()>) -> String {
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super::to_string(|s| {
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s.encode_idents_with_hygiene = true;
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f(s)
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})
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}
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thing_to_string_impls!(to_string_hyg)
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}
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pub fn visibility_qualified(vis: ast::Visibility, s: &str) -> String {
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match vis {
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ast::Public => format!("pub {}", s),
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ast::Inherited => s.to_string()
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}
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}
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|
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fn needs_parentheses(expr: &ast::Expr) -> bool {
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match expr.node {
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ast::ExprAssign(..) | ast::ExprBinary(..) |
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ast::ExprFnBlock(..) | ast::ExprProc(..) |
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ast::ExprUnboxedFn(..) | ast::ExprAssignOp(..) |
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ast::ExprCast(..) => true,
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_ => false,
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}
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}
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impl<'a> State<'a> {
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pub fn ibox(&mut self, u: uint) -> IoResult<()> {
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self.boxes.push(pp::Inconsistent);
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pp::ibox(&mut self.s, u)
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}
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pub fn end(&mut self) -> IoResult<()> {
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self.boxes.pop().unwrap();
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pp::end(&mut self.s)
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}
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pub fn cbox(&mut self, u: uint) -> IoResult<()> {
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self.boxes.push(pp::Consistent);
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pp::cbox(&mut self.s, u)
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}
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// "raw box"
|
|
pub fn rbox(&mut self, u: uint, b: pp::Breaks) -> IoResult<()> {
|
|
self.boxes.push(b);
|
|
pp::rbox(&mut self.s, u, b)
|
|
}
|
|
|
|
pub fn nbsp(&mut self) -> IoResult<()> { word(&mut self.s, " ") }
|
|
|
|
pub fn word_nbsp(&mut self, w: &str) -> IoResult<()> {
|
|
try!(word(&mut self.s, w));
|
|
self.nbsp()
|
|
}
|
|
|
|
pub fn word_space(&mut self, w: &str) -> IoResult<()> {
|
|
try!(word(&mut self.s, w));
|
|
space(&mut self.s)
|
|
}
|
|
|
|
pub fn popen(&mut self) -> IoResult<()> { word(&mut self.s, "(") }
|
|
|
|
pub fn pclose(&mut self) -> IoResult<()> { word(&mut self.s, ")") }
|
|
|
|
pub fn head(&mut self, w: &str) -> IoResult<()> {
|
|
// 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) -> IoResult<()> {
|
|
try!(word(&mut self.s, "{"));
|
|
self.end() // close the head-box
|
|
}
|
|
|
|
pub fn bclose_(&mut self, span: codemap::Span,
|
|
indented: uint) -> IoResult<()> {
|
|
self.bclose_maybe_open(span, indented, true)
|
|
}
|
|
pub fn bclose_maybe_open (&mut self, span: codemap::Span,
|
|
indented: uint, close_box: bool) -> IoResult<()> {
|
|
try!(self.maybe_print_comment(span.hi));
|
|
try!(self.break_offset_if_not_bol(1u, -(indented as int)));
|
|
try!(word(&mut self.s, "}"));
|
|
if close_box {
|
|
try!(self.end()); // close the outer-box
|
|
}
|
|
Ok(())
|
|
}
|
|
pub fn bclose(&mut self, span: codemap::Span) -> IoResult<()> {
|
|
self.bclose_(span, indent_unit)
|
|
}
|
|
|
|
pub fn is_begin(&mut self) -> bool {
|
|
match self.s.last_token() { pp::Begin(_) => true, _ => false }
|
|
}
|
|
|
|
pub fn is_end(&mut self) -> bool {
|
|
match self.s.last_token() { pp::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::Consistent,
|
|
None => false
|
|
}
|
|
}
|
|
|
|
pub fn hardbreak_if_not_bol(&mut self) -> IoResult<()> {
|
|
if !self.is_bol() {
|
|
try!(hardbreak(&mut self.s))
|
|
}
|
|
Ok(())
|
|
}
|
|
pub fn space_if_not_bol(&mut self) -> IoResult<()> {
|
|
if !self.is_bol() { try!(space(&mut self.s)); }
|
|
Ok(())
|
|
}
|
|
pub fn break_offset_if_not_bol(&mut self, n: uint,
|
|
off: int) -> IoResult<()> {
|
|
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) -> IoResult<()> {
|
|
try!(word(&mut self.s, "/*"));
|
|
try!(space(&mut self.s));
|
|
try!(word(&mut self.s, text.as_slice()));
|
|
try!(space(&mut self.s));
|
|
word(&mut self.s, "*/")
|
|
}
|
|
|
|
pub fn commasep<T>(&mut self, b: Breaks, elts: &[T],
|
|
op: |&mut State, &T| -> IoResult<()>)
|
|
-> IoResult<()> {
|
|
try!(self.rbox(0u, b));
|
|
let mut first = true;
|
|
for elt in elts.iter() {
|
|
if first { first = false; } else { try!(self.word_space(",")); }
|
|
try!(op(self, elt));
|
|
}
|
|
self.end()
|
|
}
|
|
|
|
|
|
pub fn commasep_cmnt<T>(
|
|
&mut self,
|
|
b: Breaks,
|
|
elts: &[T],
|
|
op: |&mut State, &T| -> IoResult<()>,
|
|
get_span: |&T| -> codemap::Span) -> IoResult<()> {
|
|
try!(self.rbox(0u, b));
|
|
let len = elts.len();
|
|
let mut i = 0u;
|
|
for elt in elts.iter() {
|
|
try!(self.maybe_print_comment(get_span(elt).hi));
|
|
try!(op(self, elt));
|
|
i += 1u;
|
|
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>]) -> IoResult<()> {
|
|
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]) -> IoResult<()> {
|
|
try!(self.print_inner_attributes(attrs));
|
|
for vitem in _mod.view_items.iter() {
|
|
try!(self.print_view_item(vitem));
|
|
}
|
|
for item in _mod.items.iter() {
|
|
try!(self.print_item(&**item));
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_foreign_mod(&mut self, nmod: &ast::ForeignMod,
|
|
attrs: &[ast::Attribute]) -> IoResult<()> {
|
|
try!(self.print_inner_attributes(attrs));
|
|
for vitem in nmod.view_items.iter() {
|
|
try!(self.print_view_item(vitem));
|
|
}
|
|
for item in nmod.items.iter() {
|
|
try!(self.print_foreign_item(&**item));
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_opt_lifetime(&mut self,
|
|
lifetime: &Option<ast::Lifetime>) -> IoResult<()> {
|
|
for l in lifetime.iter() {
|
|
try!(self.print_lifetime(l));
|
|
try!(self.nbsp());
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_type(&mut self, ty: &ast::Ty) -> IoResult<()> {
|
|
try!(self.maybe_print_comment(ty.span.lo));
|
|
try!(self.ibox(0u));
|
|
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.as_slice(),
|
|
|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(Some(f.abi),
|
|
None,
|
|
f.fn_style,
|
|
ast::Many,
|
|
&*f.decl,
|
|
None,
|
|
&OwnedSlice::empty(),
|
|
Some(&generics),
|
|
None));
|
|
}
|
|
ast::TyClosure(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(None,
|
|
Some('&'),
|
|
f.fn_style,
|
|
f.onceness,
|
|
&*f.decl,
|
|
None,
|
|
&f.bounds,
|
|
Some(&generics),
|
|
None));
|
|
}
|
|
ast::TyProc(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(None,
|
|
Some('~'),
|
|
f.fn_style,
|
|
f.onceness,
|
|
&*f.decl,
|
|
None,
|
|
&f.bounds,
|
|
Some(&generics),
|
|
None));
|
|
}
|
|
ast::TyPath(ref path, ref bounds, _) => {
|
|
try!(self.print_bounded_path(path, bounds));
|
|
}
|
|
ast::TyPolyTraitRef(ref poly_trait_ref) => {
|
|
try!(self.print_poly_trait_ref(&**poly_trait_ref));
|
|
}
|
|
ast::TyQPath(ref qpath) => {
|
|
try!(word(&mut self.s, "<"));
|
|
try!(self.print_type(&*qpath.for_type));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("as"));
|
|
try!(self.print_path(&qpath.trait_name, false));
|
|
try!(word(&mut self.s, ">"));
|
|
try!(word(&mut self.s, "::"));
|
|
try!(self.print_ident(qpath.item_name));
|
|
}
|
|
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) -> IoResult<()> {
|
|
try!(self.hardbreak_if_not_bol());
|
|
try!(self.maybe_print_comment(item.span.lo));
|
|
try!(self.print_outer_attributes(item.attrs.as_slice()));
|
|
match item.node {
|
|
ast::ForeignItemFn(ref decl, ref generics) => {
|
|
try!(self.print_fn(&**decl, None, abi::Rust, 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").as_slice()));
|
|
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_type(&mut self, typedef: &ast::AssociatedType)
|
|
-> IoResult<()>
|
|
{
|
|
try!(self.print_outer_attributes(typedef.attrs[]));
|
|
try!(self.word_space("type"));
|
|
try!(self.print_ty_param(&typedef.ty_param));
|
|
word(&mut self.s, ";")
|
|
}
|
|
|
|
fn print_typedef(&mut self, typedef: &ast::Typedef) -> IoResult<()> {
|
|
try!(self.word_space("type"));
|
|
try!(self.print_ident(typedef.ident));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("="));
|
|
try!(self.print_type(&*typedef.typ));
|
|
word(&mut self.s, ";")
|
|
}
|
|
|
|
/// Pretty-print an item
|
|
pub fn print_item(&mut self, item: &ast::Item) -> IoResult<()> {
|
|
try!(self.hardbreak_if_not_bol());
|
|
try!(self.maybe_print_comment(item.span.lo));
|
|
try!(self.print_outer_attributes(item.attrs.as_slice()));
|
|
try!(self.ann.pre(self, NodeItem(item)));
|
|
match item.node {
|
|
ast::ItemStatic(ref ty, m, ref expr) => {
|
|
try!(self.head(visibility_qualified(item.vis,
|
|
"static").as_slice()));
|
|
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").as_slice()));
|
|
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, fn_style, abi, ref typarams, ref body) => {
|
|
try!(self.print_fn(
|
|
&**decl,
|
|
Some(fn_style),
|
|
abi,
|
|
item.ident,
|
|
typarams,
|
|
None,
|
|
item.vis
|
|
));
|
|
try!(word(&mut self.s, " "));
|
|
try!(self.print_block_with_attrs(&**body, item.attrs.as_slice()));
|
|
}
|
|
ast::ItemMod(ref _mod) => {
|
|
try!(self.head(visibility_qualified(item.vis,
|
|
"mod").as_slice()));
|
|
try!(self.print_ident(item.ident));
|
|
try!(self.nbsp());
|
|
try!(self.bopen());
|
|
try!(self.print_mod(_mod, item.attrs.as_slice()));
|
|
try!(self.bclose(item.span));
|
|
}
|
|
ast::ItemForeignMod(ref nmod) => {
|
|
try!(self.head("extern"));
|
|
try!(self.word_nbsp(nmod.abi.to_string().as_slice()));
|
|
try!(self.bopen());
|
|
try!(self.print_foreign_mod(nmod, item.attrs.as_slice()));
|
|
try!(self.bclose(item.span));
|
|
}
|
|
ast::ItemTy(ref ty, ref params) => {
|
|
try!(self.ibox(indent_unit));
|
|
try!(self.ibox(0u));
|
|
try!(self.word_nbsp(visibility_qualified(item.vis,
|
|
"type").as_slice()));
|
|
try!(self.print_ident(item.ident));
|
|
try!(self.print_generics(params));
|
|
try!(self.end()); // end the inner ibox
|
|
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("="));
|
|
try!(self.print_type(&**ty));
|
|
try!(self.print_where_clause(params));
|
|
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").as_slice()));
|
|
try!(self.print_struct(&**struct_def, generics, item.ident, item.span));
|
|
}
|
|
|
|
ast::ItemImpl(ref generics,
|
|
ref opt_trait,
|
|
ref ty,
|
|
ref impl_items) => {
|
|
try!(self.head(visibility_qualified(item.vis,
|
|
"impl").as_slice()));
|
|
if generics.is_parameterized() {
|
|
try!(self.print_generics(generics));
|
|
try!(space(&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));
|
|
|
|
try!(space(&mut self.s));
|
|
try!(self.bopen());
|
|
try!(self.print_inner_attributes(item.attrs.as_slice()));
|
|
for impl_item in impl_items.iter() {
|
|
match *impl_item {
|
|
ast::MethodImplItem(ref meth) => {
|
|
try!(self.print_method(&**meth));
|
|
}
|
|
ast::TypeImplItem(ref typ) => {
|
|
try!(self.print_typedef(&**typ));
|
|
}
|
|
}
|
|
}
|
|
try!(self.bclose(item.span));
|
|
}
|
|
ast::ItemTrait(ref generics, ref unbound, ref bounds, ref methods) => {
|
|
try!(self.head(visibility_qualified(item.vis,
|
|
"trait").as_slice()));
|
|
try!(self.print_ident(item.ident));
|
|
try!(self.print_generics(generics));
|
|
match unbound {
|
|
&Some(ref tref) => {
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("for"));
|
|
try!(self.print_trait_ref(tref));
|
|
try!(word(&mut self.s, "?"));
|
|
}
|
|
_ => {}
|
|
}
|
|
try!(self.print_bounds(":", bounds));
|
|
try!(self.print_where_clause(generics));
|
|
try!(word(&mut self.s, " "));
|
|
try!(self.bopen());
|
|
for meth in methods.iter() {
|
|
try!(self.print_trait_method(meth));
|
|
}
|
|
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));
|
|
try!(word(&mut self.s, "! "));
|
|
try!(self.print_ident(item.ident));
|
|
try!(self.cbox(indent_unit));
|
|
try!(self.popen());
|
|
try!(self.print_tts(tts.as_slice()));
|
|
try!(self.pclose());
|
|
try!(self.end());
|
|
}
|
|
}
|
|
self.ann.post(self, NodeItem(item))
|
|
}
|
|
|
|
fn print_trait_ref(&mut self, t: &ast::TraitRef) -> IoResult<()> {
|
|
self.print_path(&t.path, false)
|
|
}
|
|
|
|
fn print_poly_trait_ref(&mut self, t: &ast::PolyTraitRef) -> IoResult<()> {
|
|
if !t.bound_lifetimes.is_empty() {
|
|
try!(word(&mut self.s, "for<"));
|
|
for lifetime_def in t.bound_lifetimes.iter() {
|
|
try!(self.print_lifetime_def(lifetime_def));
|
|
}
|
|
try!(word(&mut self.s, ">"));
|
|
}
|
|
|
|
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) -> IoResult<()> {
|
|
try!(self.head(visibility_qualified(visibility, "enum").as_slice()));
|
|
try!(self.print_ident(ident));
|
|
try!(self.print_generics(generics));
|
|
try!(self.print_where_clause(generics));
|
|
try!(space(&mut self.s));
|
|
self.print_variants(enum_definition.variants.as_slice(), span)
|
|
}
|
|
|
|
pub fn print_variants(&mut self,
|
|
variants: &[P<ast::Variant>],
|
|
span: codemap::Span) -> IoResult<()> {
|
|
try!(self.bopen());
|
|
for v in variants.iter() {
|
|
try!(self.space_if_not_bol());
|
|
try!(self.maybe_print_comment(v.span.lo));
|
|
try!(self.print_outer_attributes(v.node.attrs.as_slice()));
|
|
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) -> IoResult<()> {
|
|
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) -> IoResult<()> {
|
|
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.as_slice(),
|
|
|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!(word(&mut self.s, ";"));
|
|
try!(self.end());
|
|
self.end() // close the outer-box
|
|
} else {
|
|
try!(self.nbsp());
|
|
try!(self.bopen());
|
|
try!(self.hardbreak_if_not_bol());
|
|
|
|
for field in struct_def.fields.iter() {
|
|
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.as_slice()));
|
|
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) -> IoResult<()> {
|
|
match *tt {
|
|
ast::TtToken(_, ref tk) => {
|
|
try!(word(&mut self.s, token_to_string(tk).as_slice()));
|
|
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()).as_slice()));
|
|
try!(space(&mut self.s));
|
|
try!(self.print_tts(delimed.tts.as_slice()));
|
|
try!(space(&mut self.s));
|
|
word(&mut self.s, token_to_string(&delimed.close_token()).as_slice())
|
|
},
|
|
ast::TtSequence(_, ref seq) => {
|
|
try!(word(&mut self.s, "$("));
|
|
for tt_elt in seq.tts.iter() {
|
|
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).as_slice()));
|
|
}
|
|
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]) -> IoResult<()> {
|
|
try!(self.ibox(0));
|
|
for (i, tt) in tts.iter().enumerate() {
|
|
if i != 0 {
|
|
try!(space(&mut self.s));
|
|
}
|
|
try!(self.print_tt(tt));
|
|
}
|
|
self.end()
|
|
}
|
|
|
|
pub fn print_variant(&mut self, v: &ast::Variant) -> IoResult<()> {
|
|
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.as_slice(),
|
|
|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_ty_method(&mut self, m: &ast::TypeMethod) -> IoResult<()> {
|
|
try!(self.hardbreak_if_not_bol());
|
|
try!(self.maybe_print_comment(m.span.lo));
|
|
try!(self.print_outer_attributes(m.attrs.as_slice()));
|
|
try!(self.print_ty_fn(None,
|
|
None,
|
|
m.fn_style,
|
|
ast::Many,
|
|
&*m.decl,
|
|
Some(m.ident),
|
|
&OwnedSlice::empty(),
|
|
Some(&m.generics),
|
|
Some(&m.explicit_self.node)));
|
|
word(&mut self.s, ";")
|
|
}
|
|
|
|
pub fn print_trait_method(&mut self,
|
|
m: &ast::TraitItem) -> IoResult<()> {
|
|
match *m {
|
|
RequiredMethod(ref ty_m) => self.print_ty_method(ty_m),
|
|
ProvidedMethod(ref m) => self.print_method(&**m),
|
|
TypeTraitItem(ref t) => self.print_associated_type(&**t),
|
|
}
|
|
}
|
|
|
|
pub fn print_impl_item(&mut self, ii: &ast::ImplItem) -> IoResult<()> {
|
|
match *ii {
|
|
MethodImplItem(ref m) => self.print_method(&**m),
|
|
TypeImplItem(ref td) => self.print_typedef(&**td),
|
|
}
|
|
}
|
|
|
|
pub fn print_method(&mut self, meth: &ast::Method) -> IoResult<()> {
|
|
try!(self.hardbreak_if_not_bol());
|
|
try!(self.maybe_print_comment(meth.span.lo));
|
|
try!(self.print_outer_attributes(meth.attrs.as_slice()));
|
|
match meth.node {
|
|
ast::MethDecl(ident,
|
|
ref generics,
|
|
abi,
|
|
ref explicit_self,
|
|
fn_style,
|
|
ref decl,
|
|
ref body,
|
|
vis) => {
|
|
try!(self.print_fn(&**decl,
|
|
Some(fn_style),
|
|
abi,
|
|
ident,
|
|
generics,
|
|
Some(&explicit_self.node),
|
|
vis));
|
|
try!(word(&mut self.s, " "));
|
|
self.print_block_with_attrs(&**body, meth.attrs.as_slice())
|
|
},
|
|
ast::MethMac(codemap::Spanned { node: ast::MacInvocTT(ref pth, ref tts, _),
|
|
..}) => {
|
|
// code copied from ItemMac:
|
|
try!(self.print_path(pth, false));
|
|
try!(word(&mut self.s, "! "));
|
|
try!(self.cbox(indent_unit));
|
|
try!(self.popen());
|
|
try!(self.print_tts(tts.as_slice()));
|
|
try!(self.pclose());
|
|
self.end()
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn print_outer_attributes(&mut self,
|
|
attrs: &[ast::Attribute]) -> IoResult<()> {
|
|
let mut count = 0u;
|
|
for attr in attrs.iter() {
|
|
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]) -> IoResult<()> {
|
|
let mut count = 0u;
|
|
for attr in attrs.iter() {
|
|
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) -> IoResult<()> {
|
|
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().get())
|
|
} 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) -> IoResult<()> {
|
|
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, semi) => {
|
|
try!(self.space_if_not_bol());
|
|
try!(self.print_mac(mac));
|
|
if semi {
|
|
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) -> IoResult<()> {
|
|
self.print_block_with_attrs(blk, &[])
|
|
}
|
|
|
|
pub fn print_block_unclosed(&mut self, blk: &ast::Block) -> IoResult<()> {
|
|
self.print_block_unclosed_indent(blk, indent_unit)
|
|
}
|
|
|
|
pub fn print_block_unclosed_indent(&mut self, blk: &ast::Block,
|
|
indented: uint) -> IoResult<()> {
|
|
self.print_block_maybe_unclosed(blk, indented, &[], false)
|
|
}
|
|
|
|
pub fn print_block_with_attrs(&mut self,
|
|
blk: &ast::Block,
|
|
attrs: &[ast::Attribute]) -> IoResult<()> {
|
|
self.print_block_maybe_unclosed(blk, indent_unit, attrs, true)
|
|
}
|
|
|
|
pub fn print_block_maybe_unclosed(&mut self,
|
|
blk: &ast::Block,
|
|
indented: uint,
|
|
attrs: &[ast::Attribute],
|
|
close_box: bool) -> IoResult<()> {
|
|
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 vi in blk.view_items.iter() {
|
|
try!(self.print_view_item(vi));
|
|
}
|
|
for st in blk.stmts.iter() {
|
|
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>) -> IoResult<()> {
|
|
match els {
|
|
Some(_else) => {
|
|
match _else.node {
|
|
// "another else-if"
|
|
ast::ExprIf(ref i, ref then, ref e) => {
|
|
try!(self.cbox(indent_unit - 1u));
|
|
try!(self.ibox(0u));
|
|
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 - 1u));
|
|
try!(self.ibox(0u));
|
|
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 - 1u));
|
|
try!(self.ibox(0u));
|
|
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>) -> IoResult<()> {
|
|
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>) -> IoResult<()> {
|
|
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) -> IoResult<()> {
|
|
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));
|
|
try!(word(&mut self.s, "!"));
|
|
try!(self.popen());
|
|
try!(self.print_tts(tts.as_slice()));
|
|
self.pclose()
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
fn print_call_post(&mut self, args: &[P<ast::Expr>]) -> IoResult<()> {
|
|
try!(self.popen());
|
|
try!(self.commasep_exprs(Inconsistent, args));
|
|
self.pclose()
|
|
}
|
|
|
|
pub fn print_expr_maybe_paren(&mut self, expr: &ast::Expr) -> IoResult<()> {
|
|
let needs_par = needs_parentheses(expr);
|
|
if needs_par {
|
|
try!(self.popen());
|
|
}
|
|
try!(self.print_expr(expr));
|
|
if needs_par {
|
|
try!(self.pclose());
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_expr(&mut self, expr: &ast::Expr) -> IoResult<()> {
|
|
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 p, ref e) => {
|
|
try!(word(&mut self.s, "box"));
|
|
try!(word(&mut self.s, "("));
|
|
try!(self.print_expr(&**p));
|
|
try!(self.word_space(")"));
|
|
try!(self.print_expr(&**e));
|
|
}
|
|
ast::ExprVec(ref exprs) => {
|
|
try!(self.ibox(indent_unit));
|
|
try!(word(&mut self.s, "["));
|
|
try!(self.commasep_exprs(Inconsistent, exprs.as_slice()));
|
|
try!(word(&mut self.s, "]"));
|
|
try!(self.end());
|
|
}
|
|
|
|
ast::ExprRepeat(ref element, ref count) => {
|
|
try!(self.ibox(indent_unit));
|
|
try!(word(&mut self.s, "["));
|
|
try!(self.print_expr(&**element));
|
|
try!(word(&mut self.s, ","));
|
|
try!(word(&mut self.s, ".."));
|
|
try!(self.print_expr(&**count));
|
|
try!(word(&mut self.s, "]"));
|
|
try!(self.end());
|
|
}
|
|
|
|
ast::ExprStruct(ref path, ref fields, ref wth) => {
|
|
try!(self.print_path(path, true));
|
|
try!(word(&mut self.s, "{"));
|
|
try!(self.commasep_cmnt(
|
|
Consistent,
|
|
fields.as_slice(),
|
|
|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, "}"));
|
|
}
|
|
ast::ExprTup(ref exprs) => {
|
|
try!(self.popen());
|
|
try!(self.commasep_exprs(Inconsistent, exprs.as_slice()));
|
|
if exprs.len() == 1 {
|
|
try!(word(&mut self.s, ","));
|
|
}
|
|
try!(self.pclose());
|
|
}
|
|
ast::ExprCall(ref func, ref args) => {
|
|
try!(self.print_expr_maybe_paren(&**func));
|
|
try!(self.print_call_post(args.as_slice()));
|
|
}
|
|
ast::ExprMethodCall(ident, ref tys, ref args) => {
|
|
let base_args = args.slice_from(1);
|
|
try!(self.print_expr(&*args[0]));
|
|
try!(word(&mut self.s, "."));
|
|
try!(self.print_ident(ident.node));
|
|
if tys.len() > 0u {
|
|
try!(word(&mut self.s, "::<"));
|
|
try!(self.commasep(Inconsistent, tys.as_slice(),
|
|
|s, ty| s.print_type(&**ty)));
|
|
try!(word(&mut self.s, ">"));
|
|
}
|
|
try!(self.print_call_post(base_args));
|
|
}
|
|
ast::ExprBinary(op, ref lhs, ref rhs) => {
|
|
try!(self.print_expr(&**lhs));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space(ast_util::binop_to_string(op)));
|
|
try!(self.print_expr(&**rhs));
|
|
}
|
|
ast::ExprUnary(op, ref expr) => {
|
|
try!(word(&mut self.s, ast_util::unop_to_string(op)));
|
|
try!(self.print_expr_maybe_paren(&**expr));
|
|
}
|
|
ast::ExprAddrOf(m, ref expr) => {
|
|
try!(word(&mut self.s, "&"));
|
|
try!(self.print_mutability(m));
|
|
try!(self.print_expr_maybe_paren(&**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) => {
|
|
for ident in opt_ident.iter() {
|
|
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) => {
|
|
for ident in opt_ident.iter() {
|
|
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) => {
|
|
for ident in opt_ident.iter() {
|
|
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) => {
|
|
for ident in opt_ident.iter() {
|
|
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.iter() {
|
|
try!(self.print_arm(arm));
|
|
}
|
|
try!(self.bclose_(expr.span, indent_unit));
|
|
}
|
|
ast::ExprFnBlock(capture_clause, ref decl, ref body) => {
|
|
try!(self.print_capture_clause(capture_clause));
|
|
|
|
// in do/for blocks we don't want to show an empty
|
|
// argument list, but at this point we don't know which
|
|
// we are inside.
|
|
//
|
|
// if !decl.inputs.is_empty() {
|
|
try!(self.print_fn_block_args(&**decl, None));
|
|
try!(space(&mut self.s));
|
|
// }
|
|
|
|
if !body.stmts.is_empty() || !body.expr.is_some() {
|
|
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().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::ExprUnboxedFn(capture_clause, kind, ref decl, ref body) => {
|
|
try!(self.print_capture_clause(capture_clause));
|
|
|
|
// in do/for blocks we don't want to show an empty
|
|
// argument list, but at this point we don't know which
|
|
// we are inside.
|
|
//
|
|
// if !decl.inputs.is_empty() {
|
|
try!(self.print_fn_block_args(&**decl, Some(kind)));
|
|
try!(space(&mut self.s));
|
|
// }
|
|
|
|
if !body.stmts.is_empty() || !body.expr.is_some() {
|
|
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::ExprProc(ref decl, ref body) => {
|
|
// in do/for blocks we don't want to show an empty
|
|
// argument list, but at this point we don't know which
|
|
// we are inside.
|
|
//
|
|
// if !decl.inputs.is_empty() {
|
|
try!(self.print_proc_args(&**decl));
|
|
try!(space(&mut self.s));
|
|
// }
|
|
assert!(body.stmts.is_empty());
|
|
assert!(body.expr.is_some());
|
|
// 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(0u));
|
|
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)));
|
|
try!(self.word_space("="));
|
|
try!(self.print_expr(&**rhs));
|
|
}
|
|
ast::ExprField(ref expr, id, ref tys) => {
|
|
try!(self.print_expr(&**expr));
|
|
try!(word(&mut self.s, "."));
|
|
try!(self.print_ident(id.node));
|
|
if tys.len() > 0u {
|
|
try!(word(&mut self.s, "::<"));
|
|
try!(self.commasep(
|
|
Inconsistent, tys.as_slice(),
|
|
|s, ty| s.print_type(&**ty)));
|
|
try!(word(&mut self.s, ">"));
|
|
}
|
|
}
|
|
ast::ExprTupField(ref expr, id, ref tys) => {
|
|
try!(self.print_expr(&**expr));
|
|
try!(word(&mut self.s, "."));
|
|
try!(self.print_uint(id.node));
|
|
if tys.len() > 0u {
|
|
try!(word(&mut self.s, "::<"));
|
|
try!(self.commasep(
|
|
Inconsistent, tys.as_slice(),
|
|
|s, ty| s.print_type(&**ty)));
|
|
try!(word(&mut self.s, ">"));
|
|
}
|
|
}
|
|
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::ExprSlice(ref e, ref start, ref end, ref mutbl) => {
|
|
try!(self.print_expr(&**e));
|
|
try!(word(&mut self.s, "["));
|
|
if mutbl == &ast::MutMutable {
|
|
try!(word(&mut self.s, "mut"));
|
|
if start.is_some() || end.is_some() {
|
|
try!(space(&mut self.s));
|
|
}
|
|
}
|
|
match start {
|
|
&Some(ref e) => try!(self.print_expr(&**e)),
|
|
_ => {}
|
|
}
|
|
if start.is_some() || end.is_some() {
|
|
try!(word(&mut self.s, ".."));
|
|
}
|
|
match end {
|
|
&Some(ref e) => try!(self.print_expr(&**e)),
|
|
_ => {}
|
|
}
|
|
try!(word(&mut self.s, "]"));
|
|
}
|
|
ast::ExprPath(ref path) => try!(self.print_path(path, true)),
|
|
ast::ExprBreak(opt_ident) => {
|
|
try!(word(&mut self.s, "break"));
|
|
try!(space(&mut self.s));
|
|
for ident in opt_ident.iter() {
|
|
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));
|
|
for ident in opt_ident.iter() {
|
|
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) => {
|
|
if a.volatile {
|
|
try!(word(&mut self.s, "__volatile__ asm!"));
|
|
} else {
|
|
try!(word(&mut self.s, "asm!"));
|
|
}
|
|
try!(self.popen());
|
|
try!(self.print_string(a.asm.get(), a.asm_str_style));
|
|
try!(self.word_space(":"));
|
|
|
|
try!(self.commasep(Inconsistent, a.outputs.as_slice(),
|
|
|s, &(ref co, ref o, is_rw)| {
|
|
match co.get().slice_shift_char() {
|
|
Some(('=', operand)) if is_rw => {
|
|
try!(s.print_string(format!("+{}", operand).as_slice(),
|
|
ast::CookedStr))
|
|
}
|
|
_ => try!(s.print_string(co.get(), 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.as_slice(),
|
|
|s, &(ref co, ref o)| {
|
|
try!(s.print_string(co.get(), 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.print_string(a.clobbers.get(), ast::CookedStr));
|
|
try!(self.pclose());
|
|
}
|
|
ast::ExprMac(ref m) => try!(self.print_mac(m)),
|
|
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) -> IoResult<()> {
|
|
try!(self.print_pat(&*loc.pat));
|
|
match loc.ty.node {
|
|
ast::TyInfer => Ok(()),
|
|
_ => {
|
|
try!(self.word_space(":"));
|
|
self.print_type(&*loc.ty)
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn print_decl(&mut self, decl: &ast::Decl) -> IoResult<()> {
|
|
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());
|
|
match loc.init {
|
|
Some(ref 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) -> IoResult<()> {
|
|
if self.encode_idents_with_hygiene {
|
|
let encoded = ident.encode_with_hygiene();
|
|
try!(word(&mut self.s, encoded.as_slice()))
|
|
} else {
|
|
try!(word(&mut self.s, token::get_ident(ident).get()))
|
|
}
|
|
self.ann.post(self, NodeIdent(&ident))
|
|
}
|
|
|
|
pub fn print_uint(&mut self, i: uint) -> IoResult<()> {
|
|
word(&mut self.s, i.to_string().as_slice())
|
|
}
|
|
|
|
pub fn print_name(&mut self, name: ast::Name) -> IoResult<()> {
|
|
try!(word(&mut self.s, token::get_name(name).get()));
|
|
self.ann.post(self, NodeName(&name))
|
|
}
|
|
|
|
pub fn print_for_decl(&mut self, loc: &ast::Local,
|
|
coll: &ast::Expr) -> IoResult<()> {
|
|
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,
|
|
opt_bounds: &Option<OwnedSlice<ast::TyParamBound>>)
|
|
-> IoResult<()> {
|
|
try!(self.maybe_print_comment(path.span.lo));
|
|
if path.global {
|
|
try!(word(&mut self.s, "::"));
|
|
}
|
|
|
|
let mut first = true;
|
|
for segment in path.segments.iter() {
|
|
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));
|
|
}
|
|
|
|
match *opt_bounds {
|
|
None => Ok(()),
|
|
Some(ref bounds) => self.print_bounds("+", bounds)
|
|
}
|
|
}
|
|
|
|
fn print_path_parameters(&mut self,
|
|
parameters: &ast::PathParameters,
|
|
colons_before_params: bool)
|
|
-> IoResult<()>
|
|
{
|
|
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.iter() {
|
|
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.as_slice(),
|
|
|s, ty| s.print_type(&**ty)));
|
|
}
|
|
|
|
try!(word(&mut self.s, ">"))
|
|
}
|
|
|
|
ast::ParenthesizedParameters(ref data) => {
|
|
try!(word(&mut self.s, "("));
|
|
try!(self.commasep(
|
|
Inconsistent,
|
|
data.inputs.as_slice(),
|
|
|s, ty| s.print_type(&**ty)));
|
|
try!(word(&mut self.s, ")"));
|
|
|
|
match data.output {
|
|
None => { }
|
|
Some(ref ty) => {
|
|
try!(self.word_space("->"));
|
|
try!(self.print_type(&**ty));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
fn print_path(&mut self, path: &ast::Path,
|
|
colons_before_params: bool) -> IoResult<()> {
|
|
self.print_path_(path, colons_before_params, &None)
|
|
}
|
|
|
|
fn print_bounded_path(&mut self, path: &ast::Path,
|
|
bounds: &Option<OwnedSlice<ast::TyParamBound>>)
|
|
-> IoResult<()> {
|
|
self.print_path_(path, false, bounds)
|
|
}
|
|
|
|
pub fn print_pat(&mut self, pat: &ast::Pat) -> IoResult<()> {
|
|
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));
|
|
match *args_ {
|
|
None => try!(word(&mut self.s, "(..)")),
|
|
Some(ref args) => {
|
|
if !args.is_empty() {
|
|
try!(self.popen());
|
|
try!(self.commasep(Inconsistent, args.as_slice(),
|
|
|s, p| s.print_pat(&**p)));
|
|
try!(self.pclose());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
ast::PatStruct(ref path, ref fields, etc) => {
|
|
try!(self.print_path(path, true));
|
|
try!(self.nbsp());
|
|
try!(self.word_space("{"));
|
|
try!(self.commasep_cmnt(
|
|
Consistent, fields.as_slice(),
|
|
|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.len() != 0u { 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.as_slice(),
|
|
|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) => {
|
|
try!(word(&mut self.s, "&"));
|
|
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.as_slice(),
|
|
|s, p| s.print_pat(&**p)));
|
|
for p in slice.iter() {
|
|
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.as_slice(),
|
|
|s, p| s.print_pat(&**p)));
|
|
try!(word(&mut self.s, "]"));
|
|
}
|
|
ast::PatMac(ref m) => try!(self.print_mac(m)),
|
|
}
|
|
self.ann.post(self, NodePat(pat))
|
|
}
|
|
|
|
fn print_arm(&mut self, arm: &ast::Arm) -> IoResult<()> {
|
|
// 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(0u));
|
|
try!(self.print_outer_attributes(arm.attrs.as_slice()));
|
|
let mut first = true;
|
|
for p in arm.pats.iter() {
|
|
if first {
|
|
first = false;
|
|
} else {
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("|"));
|
|
}
|
|
try!(self.print_pat(&**p));
|
|
}
|
|
try!(space(&mut self.s));
|
|
match arm.guard {
|
|
Some(ref e) => {
|
|
try!(self.word_space("if"));
|
|
try!(self.print_expr(&**e));
|
|
try!(space(&mut self.s));
|
|
}
|
|
None => ()
|
|
}
|
|
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));
|
|
}
|
|
_ => {
|
|
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) -> IoResult<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,
|
|
fn_style: Option<ast::FnStyle>,
|
|
abi: abi::Abi,
|
|
name: ast::Ident,
|
|
generics: &ast::Generics,
|
|
opt_explicit_self: Option<&ast::ExplicitSelf_>,
|
|
vis: ast::Visibility) -> IoResult<()> {
|
|
try!(self.head(""));
|
|
try!(self.print_fn_header_info(opt_explicit_self, fn_style, abi, vis));
|
|
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)
|
|
}
|
|
|
|
pub fn print_fn_args(&mut self, decl: &ast::FnDecl,
|
|
opt_explicit_self: Option<&ast::ExplicitSelf_>)
|
|
-> IoResult<()> {
|
|
// 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(0u, Inconsistent));
|
|
let mut first = true;
|
|
for &explicit_self in opt_explicit_self.iter() {
|
|
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.as_slice()
|
|
} else {
|
|
decl.inputs.slice_from(1)
|
|
};
|
|
|
|
for arg in args.iter() {
|
|
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_>)
|
|
-> IoResult<()> {
|
|
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,
|
|
unboxed_closure_kind: Option<UnboxedClosureKind>)
|
|
-> IoResult<()> {
|
|
try!(word(&mut self.s, "|"));
|
|
match unboxed_closure_kind {
|
|
None => {}
|
|
Some(FnUnboxedClosureKind) => try!(self.word_space("&:")),
|
|
Some(FnMutUnboxedClosureKind) => try!(self.word_space("&mut:")),
|
|
Some(FnOnceUnboxedClosureKind) => try!(self.word_space(":")),
|
|
}
|
|
try!(self.print_fn_args(decl, None));
|
|
try!(word(&mut self.s, "|"));
|
|
|
|
if let ast::Return(ref ty) = decl.output {
|
|
if ty.node == ast::TyInfer {
|
|
return self.maybe_print_comment(ty.span.lo);
|
|
}
|
|
}
|
|
|
|
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::NoReturn(span) => {
|
|
try!(self.word_nbsp("!"));
|
|
self.maybe_print_comment(span.lo)
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn print_capture_clause(&mut self, capture_clause: ast::CaptureClause)
|
|
-> IoResult<()> {
|
|
match capture_clause {
|
|
ast::CaptureByValue => self.word_space("move"),
|
|
ast::CaptureByRef => Ok(()),
|
|
}
|
|
}
|
|
|
|
pub fn print_proc_args(&mut self, decl: &ast::FnDecl) -> IoResult<()> {
|
|
try!(word(&mut self.s, "proc"));
|
|
try!(word(&mut self.s, "("));
|
|
try!(self.print_fn_args(decl, None));
|
|
try!(word(&mut self.s, ")"));
|
|
|
|
if let ast::Return(ref ty) = decl.output {
|
|
if ty.node == ast::TyInfer {
|
|
return self.maybe_print_comment(ty.span.lo);
|
|
}
|
|
}
|
|
|
|
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::NoReturn(span) => {
|
|
try!(self.word_nbsp("!"));
|
|
self.maybe_print_comment(span.lo)
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn print_bounds(&mut self,
|
|
prefix: &str,
|
|
bounds: &OwnedSlice<ast::TyParamBound>)
|
|
-> IoResult<()> {
|
|
if !bounds.is_empty() {
|
|
try!(word(&mut self.s, prefix));
|
|
let mut first = true;
|
|
for bound in bounds.iter() {
|
|
try!(self.nbsp());
|
|
if first {
|
|
first = false;
|
|
} else {
|
|
try!(self.word_space("+"));
|
|
}
|
|
|
|
try!(match *bound {
|
|
TraitTyParamBound(ref tref) => {
|
|
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)
|
|
-> IoResult<()>
|
|
{
|
|
self.print_name(lifetime.name)
|
|
}
|
|
|
|
pub fn print_lifetime_def(&mut self,
|
|
lifetime: &ast::LifetimeDef)
|
|
-> IoResult<()>
|
|
{
|
|
try!(self.print_lifetime(&lifetime.lifetime));
|
|
let mut sep = ":";
|
|
for v in lifetime.bounds.iter() {
|
|
try!(word(&mut self.s, sep));
|
|
try!(self.print_lifetime(v));
|
|
sep = "+";
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_generics(&mut self,
|
|
generics: &ast::Generics)
|
|
-> IoResult<()>
|
|
{
|
|
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 range(0u, total) {
|
|
ints.push(i);
|
|
}
|
|
|
|
try!(self.commasep(Inconsistent, ints.as_slice(), |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.get(idx);
|
|
s.print_ty_param(param)
|
|
}
|
|
}));
|
|
|
|
try!(word(&mut self.s, ">"));
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_ty_param(&mut self, param: &ast::TyParam) -> IoResult<()> {
|
|
match param.unbound {
|
|
Some(ref tref) => {
|
|
try!(self.print_trait_ref(tref));
|
|
try!(self.word_space("?"));
|
|
}
|
|
_ => {}
|
|
}
|
|
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, generics: &ast::Generics)
|
|
-> IoResult<()> {
|
|
if generics.where_clause.predicates.len() == 0 {
|
|
return Ok(())
|
|
}
|
|
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("where"));
|
|
|
|
for (i, predicate) in generics.where_clause
|
|
.predicates
|
|
.iter()
|
|
.enumerate() {
|
|
if i != 0 {
|
|
try!(self.word_space(","));
|
|
}
|
|
|
|
try!(self.print_ident(predicate.ident));
|
|
try!(self.print_bounds(":", &predicate.bounds));
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_meta_item(&mut self, item: &ast::MetaItem) -> IoResult<()> {
|
|
try!(self.ibox(indent_unit));
|
|
match item.node {
|
|
ast::MetaWord(ref name) => {
|
|
try!(word(&mut self.s, name.get()));
|
|
}
|
|
ast::MetaNameValue(ref name, ref value) => {
|
|
try!(self.word_space(name.get()));
|
|
try!(self.word_space("="));
|
|
try!(self.print_literal(value));
|
|
}
|
|
ast::MetaList(ref name, ref items) => {
|
|
try!(word(&mut self.s, name.get()));
|
|
try!(self.popen());
|
|
try!(self.commasep(Consistent,
|
|
items.as_slice(),
|
|
|s, i| s.print_meta_item(&**i)));
|
|
try!(self.pclose());
|
|
}
|
|
}
|
|
self.end()
|
|
}
|
|
|
|
pub fn print_view_path(&mut self, vp: &ast::ViewPath) -> IoResult<()> {
|
|
match vp.node {
|
|
ast::ViewPathSimple(ident, ref path, _) => {
|
|
try!(self.print_path(path, false));
|
|
|
|
// 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));
|
|
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));
|
|
try!(word(&mut self.s, "::{"));
|
|
}
|
|
try!(self.commasep(Inconsistent, idents.as_slice(), |s, w| {
|
|
match w.node {
|
|
ast::PathListIdent { name, .. } => {
|
|
s.print_ident(name)
|
|
},
|
|
ast::PathListMod { .. } => {
|
|
word(&mut s.s, "mod")
|
|
}
|
|
}
|
|
}));
|
|
word(&mut self.s, "}")
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn print_view_item(&mut self, item: &ast::ViewItem) -> IoResult<()> {
|
|
try!(self.hardbreak_if_not_bol());
|
|
try!(self.maybe_print_comment(item.span.lo));
|
|
try!(self.print_outer_attributes(item.attrs.as_slice()));
|
|
try!(self.print_visibility(item.vis));
|
|
match item.node {
|
|
ast::ViewItemExternCrate(id, ref optional_path, _) => {
|
|
try!(self.head("extern crate"));
|
|
for &(ref p, style) in optional_path.iter() {
|
|
try!(self.print_string(p.get(), style));
|
|
try!(space(&mut self.s));
|
|
try!(word(&mut self.s, "as"));
|
|
try!(space(&mut self.s));
|
|
}
|
|
try!(self.print_ident(id));
|
|
}
|
|
|
|
ast::ViewItemUse(ref vp) => {
|
|
try!(self.head("use"));
|
|
try!(self.print_view_path(&**vp));
|
|
}
|
|
}
|
|
try!(word(&mut self.s, ";"));
|
|
try!(self.end()); // end inner head-block
|
|
self.end() // end outer head-block
|
|
}
|
|
|
|
pub fn print_mutability(&mut self,
|
|
mutbl: ast::Mutability) -> IoResult<()> {
|
|
match mutbl {
|
|
ast::MutMutable => self.word_nbsp("mut"),
|
|
ast::MutImmutable => Ok(()),
|
|
}
|
|
}
|
|
|
|
pub fn print_mt(&mut self, mt: &ast::MutTy) -> IoResult<()> {
|
|
try!(self.print_mutability(mt.mutbl));
|
|
self.print_type(&*mt.ty)
|
|
}
|
|
|
|
pub fn print_arg(&mut self, input: &ast::Arg) -> IoResult<()> {
|
|
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) -> IoResult<()> {
|
|
if let ast::Return(ref ty) = decl.output {
|
|
match ty.node {
|
|
ast::TyTup(ref tys) if tys.is_empty() => {
|
|
return self.maybe_print_comment(ty.span.lo);
|
|
}
|
|
_ => ()
|
|
}
|
|
}
|
|
|
|
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::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,
|
|
opt_abi: Option<abi::Abi>,
|
|
opt_sigil: Option<char>,
|
|
fn_style: ast::FnStyle,
|
|
onceness: ast::Onceness,
|
|
decl: &ast::FnDecl,
|
|
id: Option<ast::Ident>,
|
|
bounds: &OwnedSlice<ast::TyParamBound>,
|
|
generics: Option<&ast::Generics>,
|
|
opt_explicit_self: Option<&ast::ExplicitSelf_>)
|
|
-> IoResult<()> {
|
|
try!(self.ibox(indent_unit));
|
|
|
|
// Duplicates the logic in `print_fn_header_info()`. This is because that
|
|
// function prints the sigil in the wrong place. That should be fixed.
|
|
if opt_sigil == Some('~') && onceness == ast::Once {
|
|
try!(word(&mut self.s, "proc"));
|
|
} else if opt_sigil == Some('&') {
|
|
try!(self.print_fn_style(fn_style));
|
|
try!(self.print_extern_opt_abi(opt_abi));
|
|
} else {
|
|
assert!(opt_sigil.is_none());
|
|
try!(self.print_fn_style(fn_style));
|
|
try!(self.print_opt_abi_and_extern_if_nondefault(opt_abi));
|
|
try!(word(&mut self.s, "fn"));
|
|
}
|
|
|
|
match id {
|
|
Some(id) => {
|
|
try!(word(&mut self.s, " "));
|
|
try!(self.print_ident(id));
|
|
}
|
|
_ => ()
|
|
}
|
|
|
|
match generics { Some(g) => try!(self.print_generics(g)), _ => () }
|
|
try!(zerobreak(&mut self.s));
|
|
|
|
if opt_sigil == Some('&') {
|
|
try!(word(&mut self.s, "|"));
|
|
} else {
|
|
try!(self.popen());
|
|
}
|
|
|
|
try!(self.print_fn_args(decl, opt_explicit_self));
|
|
|
|
if opt_sigil == Some('&') {
|
|
try!(word(&mut self.s, "|"));
|
|
} else {
|
|
if decl.variadic {
|
|
try!(word(&mut self.s, ", ..."));
|
|
}
|
|
try!(self.pclose());
|
|
}
|
|
|
|
try!(self.print_bounds(":", bounds));
|
|
|
|
try!(self.print_fn_output(decl));
|
|
|
|
match generics {
|
|
Some(generics) => try!(self.print_where_clause(generics)),
|
|
None => {}
|
|
}
|
|
|
|
self.end()
|
|
}
|
|
|
|
pub fn maybe_print_trailing_comment(&mut self, span: codemap::Span,
|
|
next_pos: Option<BytePos>)
|
|
-> IoResult<()> {
|
|
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 += 1u;
|
|
}
|
|
}
|
|
_ => ()
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_remaining_comments(&mut self) -> IoResult<()> {
|
|
// 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 += 1u;
|
|
}
|
|
_ => break
|
|
}
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_literal(&mut self, lit: &ast::Lit) -> IoResult<()> {
|
|
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.as_slice());
|
|
}
|
|
_ => ()
|
|
}
|
|
match lit.node {
|
|
ast::LitStr(ref st, style) => self.print_string(st.get(), style),
|
|
ast::LitByte(byte) => {
|
|
let mut res = String::from_str("b'");
|
|
ascii::escape_default(byte, |c| res.push(c as char));
|
|
res.push('\'');
|
|
word(&mut self.s, res.as_slice())
|
|
}
|
|
ast::LitChar(ch) => {
|
|
let mut res = String::from_str("'");
|
|
ch.escape_default(|c| res.push(c));
|
|
res.push('\'');
|
|
word(&mut self.s, res.as_slice())
|
|
}
|
|
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)).as_slice())
|
|
}
|
|
ast::SignedIntLit(st, ast::Minus) => {
|
|
let istr = ast_util::int_ty_to_string(st, Some(-(i as i64)));
|
|
word(&mut self.s,
|
|
format!("-{}", istr).as_slice())
|
|
}
|
|
ast::UnsignedIntLit(ut) => {
|
|
word(&mut self.s, ast_util::uint_ty_to_string(ut, Some(i)).as_slice())
|
|
}
|
|
ast::UnsuffixedIntLit(ast::Plus) => {
|
|
word(&mut self.s, format!("{}", i).as_slice())
|
|
}
|
|
ast::UnsuffixedIntLit(ast::Minus) => {
|
|
word(&mut self.s, format!("-{}", i).as_slice())
|
|
}
|
|
}
|
|
}
|
|
ast::LitFloat(ref f, t) => {
|
|
word(&mut self.s,
|
|
format!(
|
|
"{}{}",
|
|
f.get(),
|
|
ast_util::float_ty_to_string(t).as_slice()).as_slice())
|
|
}
|
|
ast::LitFloatUnsuffixed(ref f) => word(&mut self.s, f.get()),
|
|
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.iter() {
|
|
ascii::escape_default(ch as u8,
|
|
|ch| escaped.push(ch as char));
|
|
}
|
|
word(&mut self.s, format!("b\"{}\"", escaped).as_slice())
|
|
}
|
|
}
|
|
}
|
|
|
|
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 += 1u;
|
|
if ltrl.pos == pos { return Some(ltrl); }
|
|
}
|
|
None
|
|
}
|
|
_ => None
|
|
}
|
|
}
|
|
|
|
pub fn maybe_print_comment(&mut self, pos: BytePos) -> IoResult<()> {
|
|
loop {
|
|
match self.next_comment() {
|
|
Some(ref cmnt) => {
|
|
if (*cmnt).pos < pos {
|
|
try!(self.print_comment(cmnt));
|
|
self.cur_cmnt_and_lit.cur_cmnt += 1u;
|
|
} else { break; }
|
|
}
|
|
_ => break
|
|
}
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn print_comment(&mut self,
|
|
cmnt: &comments::Comment) -> IoResult<()> {
|
|
match cmnt.style {
|
|
comments::Mixed => {
|
|
assert_eq!(cmnt.lines.len(), 1u);
|
|
try!(zerobreak(&mut self.s));
|
|
try!(word(&mut self.s, cmnt.lines[0].as_slice()));
|
|
zerobreak(&mut self.s)
|
|
}
|
|
comments::Isolated => {
|
|
try!(self.hardbreak_if_not_bol());
|
|
for line in cmnt.lines.iter() {
|
|
// Don't print empty lines because they will end up as trailing
|
|
// whitespace
|
|
if !line.is_empty() {
|
|
try!(word(&mut self.s, line.as_slice()));
|
|
}
|
|
try!(hardbreak(&mut self.s));
|
|
}
|
|
Ok(())
|
|
}
|
|
comments::Trailing => {
|
|
try!(word(&mut self.s, " "));
|
|
if cmnt.lines.len() == 1u {
|
|
try!(word(&mut self.s, cmnt.lines[0].as_slice()));
|
|
hardbreak(&mut self.s)
|
|
} else {
|
|
try!(self.ibox(0u));
|
|
for line in cmnt.lines.iter() {
|
|
if !line.is_empty() {
|
|
try!(word(&mut self.s, line.as_slice()));
|
|
}
|
|
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::String(s, _) => ";" == s.as_slice(),
|
|
_ => 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) -> IoResult<()> {
|
|
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.as_slice())
|
|
}
|
|
|
|
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_fn_style(&mut self,
|
|
opt_fn_style: Option<ast::FnStyle>) -> IoResult<()> {
|
|
match opt_fn_style {
|
|
Some(fn_style) => self.print_fn_style(fn_style),
|
|
None => Ok(())
|
|
}
|
|
}
|
|
|
|
pub fn print_opt_abi_and_extern_if_nondefault(&mut self,
|
|
opt_abi: Option<abi::Abi>)
|
|
-> IoResult<()> {
|
|
match opt_abi {
|
|
Some(abi::Rust) => Ok(()),
|
|
Some(abi) => {
|
|
try!(self.word_nbsp("extern"));
|
|
self.word_nbsp(abi.to_string().as_slice())
|
|
}
|
|
None => Ok(())
|
|
}
|
|
}
|
|
|
|
pub fn print_extern_opt_abi(&mut self,
|
|
opt_abi: Option<abi::Abi>) -> IoResult<()> {
|
|
match opt_abi {
|
|
Some(abi) => {
|
|
try!(self.word_nbsp("extern"));
|
|
self.word_nbsp(abi.to_string().as_slice())
|
|
}
|
|
None => Ok(())
|
|
}
|
|
}
|
|
|
|
pub fn print_fn_header_info(&mut self,
|
|
_opt_explicit_self: Option<&ast::ExplicitSelf_>,
|
|
opt_fn_style: Option<ast::FnStyle>,
|
|
abi: abi::Abi,
|
|
vis: ast::Visibility) -> IoResult<()> {
|
|
try!(word(&mut self.s, visibility_qualified(vis, "").as_slice()));
|
|
try!(self.print_opt_fn_style(opt_fn_style));
|
|
|
|
if abi != abi::Rust {
|
|
try!(self.word_nbsp("extern"));
|
|
try!(self.word_nbsp(abi.to_string().as_slice()));
|
|
}
|
|
|
|
word(&mut self.s, "fn")
|
|
}
|
|
|
|
pub fn print_fn_style(&mut self, s: ast::FnStyle) -> IoResult<()> {
|
|
match s {
|
|
ast::NormalFn => Ok(()),
|
|
ast::UnsafeFn => self.word_nbsp("unsafe"),
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod test {
|
|
use super::*;
|
|
|
|
use ast;
|
|
use ast_util;
|
|
use codemap;
|
|
use parse::token;
|
|
use ptr::P;
|
|
|
|
#[test]
|
|
fn test_fun_to_string() {
|
|
let abba_ident = token::str_to_ident("abba");
|
|
|
|
let decl = ast::FnDecl {
|
|
inputs: Vec::new(),
|
|
output: ast::Return(P(ast::Ty {id: 0,
|
|
node: ast::TyTup(vec![]),
|
|
span: codemap::DUMMY_SP})),
|
|
variadic: false
|
|
};
|
|
let generics = ast_util::empty_generics();
|
|
assert_eq!(&fun_to_string(&decl, ast::NormalFn, abba_ident,
|
|
None, &generics),
|
|
&"fn abba()".to_string());
|
|
}
|
|
|
|
#[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".to_string());
|
|
}
|
|
|
|
#[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) 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)));
|
|
}
|
|
}
|