2499 lines
89 KiB
Rust
2499 lines
89 KiB
Rust
// Copyright 2012 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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use abi;
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use ast::{P, StaticRegionTyParamBound, OtherRegionTyParamBound,
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TraitTyParamBound, Required, Provided};
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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::classify::expr_is_simple_block;
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use parse::token::IdentInterner;
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use parse::{comments, token};
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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 std::io::{IoResult, MemWriter};
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use std::io;
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use std::mem;
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use std::rc::Rc;
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use std::str;
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use std::strbuf::StrBuf;
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pub enum AnnNode<'a> {
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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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intr: Rc<token::IdentInterner>,
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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
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}
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pub fn rust_printer(writer: Box<io::Writer>) -> 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>,
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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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intr: token::get_ident_interner(),
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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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}
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}
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pub static indent_unit: uint = 4u;
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pub static 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: StrBuf,
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input: &mut io::Reader,
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out: Box<io::Writer>,
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ann: &'a PpAnn,
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is_expanded: bool) -> IoResult<()> {
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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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);
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let mut s = State {
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s: pp::mk_printer(out, default_columns),
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cm: Some(cm),
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intr: token::get_ident_interner(),
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comments: 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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literals: if is_expanded {
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None
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} else {
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Some(lits)
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},
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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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};
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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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pub fn to_str(f: |&mut State| -> IoResult<()>) -> StrBuf {
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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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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 (_, wr): (uint, Box<MemWriter>) = mem::transmute_copy(&s.s.out);
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let result =
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str::from_utf8_owned(Vec::from_slice(wr.get_ref())).unwrap();
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mem::forget(wr);
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result.to_strbuf()
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}
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}
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pub fn ty_to_str(ty: &ast::Ty) -> StrBuf {
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to_str(|s| s.print_type(ty))
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}
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pub fn pat_to_str(pat: &ast::Pat) -> StrBuf {
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to_str(|s| s.print_pat(pat))
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}
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pub fn expr_to_str(e: &ast::Expr) -> StrBuf {
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to_str(|s| s.print_expr(e))
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}
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pub fn lifetime_to_str(e: &ast::Lifetime) -> StrBuf {
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to_str(|s| s.print_lifetime(e))
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}
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pub fn tt_to_str(tt: &ast::TokenTree) -> StrBuf {
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to_str(|s| s.print_tt(tt))
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}
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pub fn tts_to_str(tts: &[ast::TokenTree]) -> StrBuf {
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to_str(|s| s.print_tts(tts))
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}
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pub fn stmt_to_str(stmt: &ast::Stmt) -> StrBuf {
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to_str(|s| s.print_stmt(stmt))
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}
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pub fn item_to_str(i: &ast::Item) -> StrBuf {
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to_str(|s| s.print_item(i))
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}
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pub fn generics_to_str(generics: &ast::Generics) -> StrBuf {
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to_str(|s| s.print_generics(generics))
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}
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pub fn ty_method_to_str(p: &ast::TypeMethod) -> StrBuf {
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to_str(|s| s.print_ty_method(p))
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}
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pub fn method_to_str(p: &ast::Method) -> StrBuf {
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to_str(|s| s.print_method(p))
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}
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pub fn fn_block_to_str(p: &ast::FnDecl) -> StrBuf {
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to_str(|s| s.print_fn_block_args(p))
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}
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pub fn path_to_str(p: &ast::Path) -> StrBuf {
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to_str(|s| s.print_path(p, false))
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}
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pub fn fun_to_str(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) -> StrBuf {
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to_str(|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_str(blk: &ast::Block) -> StrBuf {
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to_str(|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_str(mi: &ast::MetaItem) -> StrBuf {
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to_str(|s| s.print_meta_item(mi))
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}
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pub fn attribute_to_str(attr: &ast::Attribute) -> StrBuf {
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to_str(|s| s.print_attribute(attr))
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}
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pub fn lit_to_str(l: &ast::Lit) -> StrBuf {
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to_str(|s| s.print_literal(l))
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}
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pub fn explicit_self_to_str(explicit_self: ast::ExplicitSelf_) -> StrBuf {
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to_str(|s| s.print_explicit_self(explicit_self, ast::MutImmutable).map(|_| {}))
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}
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pub fn variant_to_str(var: &ast::Variant) -> StrBuf {
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to_str(|s| s.print_variant(var))
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}
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pub fn visibility_qualified(vis: ast::Visibility, s: &str) -> StrBuf {
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match vis {
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ast::Public => format!("pub {}", s).to_strbuf(),
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ast::Inherited => s.to_strbuf()
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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::ExprAssignOp(..) | 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"
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pub fn rbox(&mut self, u: uint, b: pp::Breaks) -> IoResult<()> {
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self.boxes.push(b);
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pp::rbox(&mut self.s, u, b)
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}
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pub fn nbsp(&mut self) -> IoResult<()> { word(&mut self.s, " ") }
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pub fn word_nbsp(&mut self, w: &str) -> IoResult<()> {
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try!(word(&mut self.s, w));
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self.nbsp()
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}
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pub fn word_space(&mut self, w: &str) -> IoResult<()> {
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try!(word(&mut self.s, w));
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space(&mut self.s)
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}
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pub fn popen(&mut self) -> IoResult<()> { word(&mut self.s, "(") }
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pub fn pclose(&mut self) -> IoResult<()> { word(&mut self.s, ")") }
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pub fn head(&mut self, w: &str) -> IoResult<()> {
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// outer-box is consistent
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try!(self.cbox(indent_unit));
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// head-box is inconsistent
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try!(self.ibox(w.len() + 1));
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// keyword that starts the head
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if !w.is_empty() {
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try!(self.word_nbsp(w));
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}
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Ok(())
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}
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pub fn bopen(&mut self) -> IoResult<()> {
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try!(word(&mut self.s, "{"));
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self.end() // close the head-box
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}
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pub fn bclose_(&mut self, span: codemap::Span,
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indented: uint) -> IoResult<()> {
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self.bclose_maybe_open(span, indented, true)
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}
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pub fn bclose_maybe_open (&mut self, span: codemap::Span,
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indented: uint, close_box: bool) -> IoResult<()> {
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try!(self.maybe_print_comment(span.hi));
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try!(self.break_offset_if_not_bol(1u, -(indented as int)));
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try!(word(&mut self.s, "}"));
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if close_box {
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try!(self.end()); // close the outer-box
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}
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Ok(())
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}
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pub fn bclose(&mut self, span: codemap::Span) -> IoResult<()> {
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self.bclose_(span, indent_unit)
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}
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pub fn is_begin(&mut self) -> bool {
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match self.s.last_token() { pp::Begin(_) => true, _ => false }
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}
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pub fn is_end(&mut self) -> bool {
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match self.s.last_token() { pp::End => true, _ => false }
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}
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pub fn is_bol(&mut self) -> bool {
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self.s.last_token().is_eof() || self.s.last_token().is_hardbreak_tok()
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}
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pub fn in_cbox(&self) -> bool {
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match self.boxes.last() {
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Some(&last_box) => last_box == pp::Consistent,
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None => false
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}
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}
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pub fn hardbreak_if_not_bol(&mut self) -> IoResult<()> {
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if !self.is_bol() {
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try!(hardbreak(&mut self.s))
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}
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Ok(())
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}
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pub fn space_if_not_bol(&mut self) -> IoResult<()> {
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if !self.is_bol() { try!(space(&mut self.s)); }
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Ok(())
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}
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pub fn break_offset_if_not_bol(&mut self, n: uint,
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off: int) -> IoResult<()> {
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if !self.is_bol() {
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break_offset(&mut self.s, n, off)
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} else {
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if off != 0 && self.s.last_token().is_hardbreak_tok() {
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// We do something pretty sketchy here: tuck the nonzero
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// offset-adjustment we were going to deposit along with the
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// break into the previous hardbreak.
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self.s.replace_last_token(pp::hardbreak_tok_offset(off));
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}
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Ok(())
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}
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}
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// Synthesizes a comment that was not textually present in the original source
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// file.
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pub fn synth_comment(&mut self, text: StrBuf) -> IoResult<()> {
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try!(word(&mut self.s, "/*"));
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try!(space(&mut self.s));
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try!(word(&mut self.s, text.as_slice()));
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try!(space(&mut self.s));
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word(&mut self.s, "*/")
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}
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pub fn commasep<T>(&mut self, b: Breaks, elts: &[T],
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op: |&mut State, &T| -> IoResult<()>)
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-> IoResult<()> {
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try!(self.rbox(0u, b));
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let mut first = true;
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for elt in elts.iter() {
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if first { first = false; } else { try!(self.word_space(",")); }
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try!(op(self, elt));
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}
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self.end()
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}
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pub fn commasep_cmnt<T>(
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&mut self,
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b: Breaks,
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elts: &[T],
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op: |&mut State, &T| -> IoResult<()>,
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get_span: |&T| -> codemap::Span) -> IoResult<()> {
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try!(self.rbox(0u, b));
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let len = elts.len();
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let mut i = 0u;
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for elt in elts.iter() {
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try!(self.maybe_print_comment(get_span(elt).hi));
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try!(op(self, elt));
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i += 1u;
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if i < len {
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try!(word(&mut self.s, ","));
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try!(self.maybe_print_trailing_comment(get_span(elt),
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Some(get_span(&elts[i]).hi)));
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try!(self.space_if_not_bol());
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}
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}
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self.end()
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}
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pub fn commasep_exprs(&mut self, b: Breaks,
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exprs: &[@ast::Expr]) -> IoResult<()> {
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self.commasep_cmnt(b, exprs, |s, &e| s.print_expr(e), |e| e.span)
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}
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pub fn print_mod(&mut self, _mod: &ast::Mod,
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attrs: &[ast::Attribute]) -> IoResult<()> {
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try!(self.print_inner_attributes(attrs));
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for vitem in _mod.view_items.iter() {
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try!(self.print_view_item(vitem));
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}
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for item in _mod.items.iter() {
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try!(self.print_item(*item));
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}
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Ok(())
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}
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pub fn print_foreign_mod(&mut self, nmod: &ast::ForeignMod,
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attrs: &[ast::Attribute]) -> IoResult<()> {
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try!(self.print_inner_attributes(attrs));
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for vitem in nmod.view_items.iter() {
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try!(self.print_view_item(vitem));
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}
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for item in nmod.items.iter() {
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try!(self.print_foreign_item(*item));
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}
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Ok(())
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}
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pub fn print_opt_lifetime(&mut self,
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lifetime: &Option<ast::Lifetime>) -> IoResult<()> {
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for l in lifetime.iter() {
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try!(self.print_lifetime(l));
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try!(self.nbsp());
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}
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Ok(())
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}
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pub fn print_type(&mut self, ty: &ast::Ty) -> IoResult<()> {
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try!(self.maybe_print_comment(ty.span.lo));
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try!(self.ibox(0u));
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match ty.node {
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ast::TyNil => try!(word(&mut self.s, "()")),
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ast::TyBot => try!(word(&mut self.s, "!")),
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ast::TyBox(ty) => {
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try!(word(&mut self.s, "@"));
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try!(self.print_type(ty));
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}
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ast::TyUniq(ty) => {
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try!(word(&mut self.s, "~"));
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try!(self.print_type(ty));
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}
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ast::TyVec(ty) => {
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try!(word(&mut self.s, "["));
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try!(self.print_type(ty));
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try!(word(&mut self.s, "]"));
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}
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ast::TyPtr(ref mt) => {
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try!(word(&mut self.s, "*"));
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try!(self.print_mt(mt));
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}
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ast::TyRptr(ref lifetime, ref mt) => {
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try!(word(&mut self.s, "&"));
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try!(self.print_opt_lifetime(lifetime));
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try!(self.print_mt(mt));
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}
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ast::TyTup(ref elts) => {
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try!(self.popen());
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try!(self.commasep(Inconsistent, elts.as_slice(),
|
|
|s, ty| s.print_type_ref(ty)));
|
|
if elts.len() == 1 {
|
|
try!(word(&mut self.s, ","));
|
|
}
|
|
try!(self.pclose());
|
|
}
|
|
ast::TyBareFn(f) => {
|
|
let generics = ast::Generics {
|
|
lifetimes: f.lifetimes.clone(),
|
|
ty_params: OwnedSlice::empty()
|
|
};
|
|
try!(self.print_ty_fn(Some(f.abi), None, &None,
|
|
f.fn_style, ast::Many, f.decl, None, &None,
|
|
Some(&generics), None));
|
|
}
|
|
ast::TyClosure(f, ref region) => {
|
|
let generics = ast::Generics {
|
|
lifetimes: f.lifetimes.clone(),
|
|
ty_params: OwnedSlice::empty()
|
|
};
|
|
try!(self.print_ty_fn(None, Some('&'), region, f.fn_style,
|
|
f.onceness, f.decl, None, &f.bounds,
|
|
Some(&generics), None));
|
|
}
|
|
ast::TyProc(f) => {
|
|
let generics = ast::Generics {
|
|
lifetimes: f.lifetimes.clone(),
|
|
ty_params: OwnedSlice::empty()
|
|
};
|
|
try!(self.print_ty_fn(None, Some('~'), &None, 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::TyFixedLengthVec(ty, 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(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_type_ref(&mut self, ty: &P<ast::Ty>) -> IoResult<()> {
|
|
self.print_type(*ty)
|
|
}
|
|
|
|
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(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(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
|
|
}
|
|
}
|
|
}
|
|
|
|
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(ty, m, 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::ItemFn(decl, fn_style, abi, ref typarams, 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_str().as_slice()));
|
|
try!(self.bopen());
|
|
try!(self.print_foreign_mod(nmod, item.attrs.as_slice()));
|
|
try!(self.bclose(item.span));
|
|
}
|
|
ast::ItemTy(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!(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(struct_def, ref generics) => {
|
|
if struct_def.is_virtual {
|
|
try!(self.word_space("virtual"));
|
|
}
|
|
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, ty, ref methods) => {
|
|
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!(space(&mut self.s));
|
|
try!(self.bopen());
|
|
try!(self.print_inner_attributes(item.attrs.as_slice()));
|
|
for meth in methods.iter() {
|
|
try!(self.print_method(*meth));
|
|
}
|
|
try!(self.bclose(item.span));
|
|
}
|
|
ast::ItemTrait(ref generics, ref sized, ref traits, ref methods) => {
|
|
try!(self.head(visibility_qualified(item.vis,
|
|
"trait").as_slice()));
|
|
try!(self.print_ident(item.ident));
|
|
try!(self.print_generics(generics));
|
|
if *sized == ast::DynSize {
|
|
try!(space(&mut self.s));
|
|
try!(word(&mut self.s, "for type"));
|
|
}
|
|
if traits.len() != 0u {
|
|
try!(word(&mut self.s, ":"));
|
|
for (i, trait_) in traits.iter().enumerate() {
|
|
try!(self.nbsp());
|
|
if i != 0 {
|
|
try!(self.word_space("+"));
|
|
}
|
|
try!(self.print_path(&trait_.path, false));
|
|
}
|
|
}
|
|
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)
|
|
}
|
|
|
|
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!(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));
|
|
match struct_def.super_struct {
|
|
Some(t) => {
|
|
try!(self.word_space(":"));
|
|
try!(self.print_type(t));
|
|
},
|
|
None => {},
|
|
}
|
|
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(..) => fail!("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(..) => fail!("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::TTDelim(ref tts) => self.print_tts(tts.as_slice()),
|
|
ast::TTTok(_, ref tk) => {
|
|
try!(word(&mut self.s, parse::token::to_str(tk).as_slice()));
|
|
match *tk {
|
|
parse::token::DOC_COMMENT(..) => {
|
|
hardbreak(&mut self.s)
|
|
}
|
|
_ => Ok(())
|
|
}
|
|
}
|
|
ast::TTSeq(_, ref tts, ref sep, zerok) => {
|
|
try!(word(&mut self.s, "$("));
|
|
for tt_elt in (*tts).iter() {
|
|
try!(self.print_tt(tt_elt));
|
|
}
|
|
try!(word(&mut self.s, ")"));
|
|
match *sep {
|
|
Some(ref tk) => {
|
|
try!(word(&mut self.s,
|
|
parse::token::to_str(tk).as_slice()));
|
|
}
|
|
None => ()
|
|
}
|
|
word(&mut self.s, if zerok { "*" } else { "+" })
|
|
}
|
|
ast::TTNonterminal(_, name) => {
|
|
try!(word(&mut self.s, "$"));
|
|
self.print_ident(name)
|
|
}
|
|
}
|
|
}
|
|
|
|
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(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(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,
|
|
&None,
|
|
m.fn_style,
|
|
ast::Many,
|
|
m.decl,
|
|
Some(m.ident),
|
|
&None,
|
|
Some(&m.generics),
|
|
Some(m.explicit_self.node)));
|
|
word(&mut self.s, ";")
|
|
}
|
|
|
|
pub fn print_trait_method(&mut self,
|
|
m: &ast::TraitMethod) -> IoResult<()> {
|
|
match *m {
|
|
Required(ref ty_m) => self.print_ty_method(ty_m),
|
|
Provided(m) => self.print_method(m)
|
|
}
|
|
}
|
|
|
|
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()));
|
|
try!(self.print_fn(meth.decl, Some(meth.fn_style), abi::Rust,
|
|
meth.ident, &meth.generics, Some(meth.explicit_self.node),
|
|
meth.vis));
|
|
try!(word(&mut self.s, " "));
|
|
self.print_block_with_attrs(meth.body, meth.attrs.as_slice())
|
|
}
|
|
|
|
pub fn print_outer_attributes(&mut self,
|
|
attrs: &[ast::Attribute]) -> IoResult<()> {
|
|
let mut count = 0;
|
|
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 = 0;
|
|
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(decl, _) => {
|
|
try!(self.print_decl(decl));
|
|
}
|
|
ast::StmtExpr(expr, _) => {
|
|
try!(self.space_if_not_bol());
|
|
try!(self.print_expr(expr));
|
|
}
|
|
ast::StmtSemi(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) {
|
|
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(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(i, t, 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(t));
|
|
self.print_else(e)
|
|
}
|
|
// "final else"
|
|
ast::ExprBlock(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
|
|
_ => {
|
|
fail!("print_if saw if with weird alternative");
|
|
}
|
|
}
|
|
}
|
|
_ => Ok(())
|
|
}
|
|
}
|
|
|
|
pub fn print_if(&mut self, test: &ast::Expr, blk: &ast::Block,
|
|
elseopt: Option<@ast::Expr>, chk: bool) -> IoResult<()> {
|
|
try!(self.head("if"));
|
|
if chk { try!(self.word_nbsp("check")); }
|
|
try!(self.print_expr(test));
|
|
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()
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn print_expr_vstore(&mut self, t: ast::ExprVstore) -> IoResult<()> {
|
|
match t {
|
|
ast::ExprVstoreUniq => word(&mut self.s, "box "),
|
|
ast::ExprVstoreSlice => word(&mut self.s, "&"),
|
|
ast::ExprVstoreMutSlice => {
|
|
try!(word(&mut self.s, "&"));
|
|
word(&mut self.s, "mut")
|
|
}
|
|
}
|
|
}
|
|
|
|
fn print_call_post(&mut self, args: &[@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::ExprVstore(e, v) => {
|
|
try!(self.print_expr_vstore(v));
|
|
try!(self.print_expr(e));
|
|
},
|
|
ast::ExprBox(p, 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(element, 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, 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(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(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.get(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_ref(ty)));
|
|
try!(word(&mut self.s, ">"));
|
|
}
|
|
try!(self.print_call_post(base_args));
|
|
}
|
|
ast::ExprBinary(op, lhs, rhs) => {
|
|
try!(self.print_expr(lhs));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space(ast_util::binop_to_str(op)));
|
|
try!(self.print_expr(rhs));
|
|
}
|
|
ast::ExprUnary(op, expr) => {
|
|
try!(word(&mut self.s, ast_util::unop_to_str(op)));
|
|
try!(self.print_expr_maybe_paren(expr));
|
|
}
|
|
ast::ExprAddrOf(m, expr) => {
|
|
try!(word(&mut self.s, "&"));
|
|
try!(self.print_mutability(m));
|
|
try!(self.print_expr_maybe_paren(expr));
|
|
}
|
|
ast::ExprLit(lit) => try!(self.print_literal(lit)),
|
|
ast::ExprCast(expr, ty) => {
|
|
try!(self.print_expr(expr));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("as"));
|
|
try!(self.print_type(ty));
|
|
}
|
|
ast::ExprIf(test, blk, elseopt) => {
|
|
try!(self.print_if(test, blk, elseopt, false));
|
|
}
|
|
ast::ExprWhile(test, blk) => {
|
|
try!(self.head("while"));
|
|
try!(self.print_expr(test));
|
|
try!(space(&mut self.s));
|
|
try!(self.print_block(blk));
|
|
}
|
|
ast::ExprForLoop(pat, iter, blk, opt_ident) => {
|
|
for ident in opt_ident.iter() {
|
|
try!(word(&mut self.s, "'"));
|
|
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(blk, opt_ident) => {
|
|
for ident in opt_ident.iter() {
|
|
try!(word(&mut self.s, "'"));
|
|
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(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());
|
|
let len = arms.len();
|
|
for (i, arm) in arms.iter().enumerate() {
|
|
// 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(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(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));
|
|
}
|
|
}
|
|
if !expr_is_simple_block(expr)
|
|
&& i < len - 1 {
|
|
try!(word(&mut self.s, ","));
|
|
}
|
|
try!(self.end()); // close enclosing cbox
|
|
}
|
|
try!(self.bclose_(expr.span, indent_unit));
|
|
}
|
|
ast::ExprFnBlock(decl, 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_fn_block_args(decl));
|
|
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.unwrap().node {
|
|
ast::ExprBlock(blk) => {
|
|
try!(self.print_block_unclosed(blk));
|
|
}
|
|
_ => {
|
|
// this is a bare expression
|
|
try!(self.print_expr(body.expr.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(decl, 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.unwrap().node {
|
|
ast::ExprBlock(blk) => {
|
|
try!(self.print_block_unclosed(blk));
|
|
}
|
|
_ => {
|
|
// this is a bare expression
|
|
try!(self.print_expr(body.expr.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(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(lhs, rhs) => {
|
|
try!(self.print_expr(lhs));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("="));
|
|
try!(self.print_expr(rhs));
|
|
}
|
|
ast::ExprAssignOp(op, lhs, rhs) => {
|
|
try!(self.print_expr(lhs));
|
|
try!(space(&mut self.s));
|
|
try!(word(&mut self.s, ast_util::binop_to_str(op)));
|
|
try!(self.word_space("="));
|
|
try!(self.print_expr(rhs));
|
|
}
|
|
ast::ExprField(expr, id, ref tys) => {
|
|
try!(self.print_expr(expr));
|
|
try!(word(&mut self.s, "."));
|
|
try!(self.print_ident(id));
|
|
if tys.len() > 0u {
|
|
try!(word(&mut self.s, "::<"));
|
|
try!(self.commasep(
|
|
Inconsistent, tys.as_slice(),
|
|
|s, ty| s.print_type_ref(ty)));
|
|
try!(word(&mut self.s, ">"));
|
|
}
|
|
}
|
|
ast::ExprIndex(expr, index) => {
|
|
try!(self.print_expr(expr));
|
|
try!(word(&mut self.s, "["));
|
|
try!(self.print_expr(index));
|
|
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!(word(&mut self.s, "'"));
|
|
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!(word(&mut self.s, "'"));
|
|
try!(self.print_ident(*ident));
|
|
try!(space(&mut self.s))
|
|
}
|
|
}
|
|
ast::ExprRet(result) => {
|
|
try!(word(&mut self.s, "return"));
|
|
match result {
|
|
Some(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, 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.commasep(Inconsistent, a.inputs.as_slice(), |s, &(ref co, 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(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(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(init) => {
|
|
try!(self.nbsp());
|
|
try!(self.word_space("="));
|
|
try!(self.print_expr(init));
|
|
}
|
|
_ => {}
|
|
}
|
|
self.end()
|
|
}
|
|
ast::DeclItem(item) => self.print_item(item)
|
|
}
|
|
}
|
|
|
|
pub fn print_ident(&mut self, ident: ast::Ident) -> IoResult<()> {
|
|
word(&mut self.s, token::get_ident(ident).get())
|
|
}
|
|
|
|
pub fn print_name(&mut self, name: ast::Name) -> IoResult<()> {
|
|
word(&mut self.s, token::get_name(name).get())
|
|
}
|
|
|
|
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));
|
|
|
|
if !segment.lifetimes.is_empty() || !segment.types.is_empty() {
|
|
if colons_before_params {
|
|
try!(word(&mut self.s, "::"))
|
|
}
|
|
try!(word(&mut self.s, "<"));
|
|
|
|
let mut comma = false;
|
|
for lifetime in segment.lifetimes.iter() {
|
|
if comma {
|
|
try!(self.word_space(","))
|
|
}
|
|
try!(self.print_lifetime(lifetime));
|
|
comma = true;
|
|
}
|
|
|
|
if !segment.types.is_empty() {
|
|
if comma {
|
|
try!(self.word_space(","))
|
|
}
|
|
try!(self.commasep(
|
|
Inconsistent,
|
|
segment.types.as_slice(),
|
|
|s, ty| s.print_type_ref(ty)));
|
|
}
|
|
|
|
try!(word(&mut self.s, ">"))
|
|
}
|
|
}
|
|
|
|
match *opt_bounds {
|
|
None => Ok(()),
|
|
Some(ref bounds) => self.print_bounds(&None, bounds, true),
|
|
}
|
|
}
|
|
|
|
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 => try!(word(&mut self.s, "_")),
|
|
ast::PatWildMulti => try!(word(&mut self.s, "..")),
|
|
ast::PatIdent(binding_mode, ref path, 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_path(path, true));
|
|
match sub {
|
|
Some(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!(word(&mut self.s, "{"));
|
|
try!(self.commasep_cmnt(
|
|
Consistent, fields.as_slice(),
|
|
|s, f| {
|
|
try!(s.cbox(indent_unit));
|
|
try!(s.print_ident(f.ident));
|
|
try!(s.word_space(":"));
|
|
try!(s.print_pat(f.pat));
|
|
s.end()
|
|
},
|
|
|f| f.pat.span));
|
|
if etc {
|
|
if fields.len() != 0u { try!(self.word_space(",")); }
|
|
try!(word(&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::PatUniq(inner) => {
|
|
try!(word(&mut self.s, "box "));
|
|
try!(self.print_pat(inner));
|
|
}
|
|
ast::PatRegion(inner) => {
|
|
try!(word(&mut self.s, "&"));
|
|
try!(self.print_pat(inner));
|
|
}
|
|
ast::PatLit(e) => try!(self.print_expr(e)),
|
|
ast::PatRange(begin, 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, 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(",")); }
|
|
match *p {
|
|
ast::Pat { node: ast::PatWildMulti, .. } => {
|
|
// this case is handled by print_pat
|
|
}
|
|
_ => try!(word(&mut self.s, "..")),
|
|
}
|
|
try!(self.print_pat(p));
|
|
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, "]"));
|
|
}
|
|
}
|
|
self.ann.post(self, NodePat(pat))
|
|
}
|
|
|
|
// 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::SelfUniq => {
|
|
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"));
|
|
}
|
|
}
|
|
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));
|
|
self.print_fn_args_and_ret(decl, opt_explicit_self)
|
|
}
|
|
|
|
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.get(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());
|
|
|
|
try!(self.maybe_print_comment(decl.output.span.lo));
|
|
match decl.output.node {
|
|
ast::TyNil => Ok(()),
|
|
_ => {
|
|
try!(self.space_if_not_bol());
|
|
try!(self.word_space("->"));
|
|
self.print_type(decl.output)
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn print_fn_block_args(&mut self,
|
|
decl: &ast::FnDecl) -> IoResult<()> {
|
|
try!(word(&mut self.s, "|"));
|
|
try!(self.print_fn_args(decl, None));
|
|
try!(word(&mut self.s, "|"));
|
|
|
|
match decl.output.node {
|
|
ast::TyInfer => {}
|
|
_ => {
|
|
try!(self.space_if_not_bol());
|
|
try!(self.word_space("->"));
|
|
try!(self.print_type(decl.output));
|
|
}
|
|
}
|
|
|
|
self.maybe_print_comment(decl.output.span.lo)
|
|
}
|
|
|
|
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, ")"));
|
|
|
|
match decl.output.node {
|
|
ast::TyInfer => {}
|
|
_ => {
|
|
try!(self.space_if_not_bol());
|
|
try!(self.word_space("->"));
|
|
try!(self.print_type(decl.output));
|
|
}
|
|
}
|
|
|
|
self.maybe_print_comment(decl.output.span.lo)
|
|
}
|
|
|
|
pub fn print_bounds(&mut self,
|
|
region: &Option<ast::Lifetime>,
|
|
bounds: &OwnedSlice<ast::TyParamBound>,
|
|
print_colon_anyway: bool) -> IoResult<()> {
|
|
if !bounds.is_empty() || region.is_some() {
|
|
try!(word(&mut self.s, ":"));
|
|
let mut first = true;
|
|
match *region {
|
|
Some(ref lt) => {
|
|
let token = token::get_name(lt.name);
|
|
if token.get() != "static" {
|
|
try!(self.nbsp());
|
|
first = false;
|
|
try!(self.print_lifetime(lt));
|
|
}
|
|
}
|
|
None => {}
|
|
}
|
|
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_trait_ref(tref),
|
|
StaticRegionTyParamBound => word(&mut self.s, "'static"),
|
|
OtherRegionTyParamBound(_) => Ok(())
|
|
})
|
|
}
|
|
Ok(())
|
|
} else if print_colon_anyway {
|
|
word(&mut self.s, ":")
|
|
} else {
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
pub fn print_lifetime(&mut self,
|
|
lifetime: &ast::Lifetime) -> IoResult<()> {
|
|
try!(word(&mut self.s, "'"));
|
|
self.print_name(lifetime.name)
|
|
}
|
|
|
|
pub fn print_generics(&mut self,
|
|
generics: &ast::Generics) -> IoResult<()> {
|
|
let total = generics.lifetimes.len() + generics.ty_params.len();
|
|
if total > 0 {
|
|
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.get(idx);
|
|
s.print_lifetime(lifetime)
|
|
} else {
|
|
let idx = idx - generics.lifetimes.len();
|
|
let param = generics.ty_params.get(idx);
|
|
if param.sized == ast::DynSize {
|
|
try!(s.word_space("type"));
|
|
}
|
|
try!(s.print_ident(param.ident));
|
|
try!(s.print_bounds(&None, ¶m.bounds, false));
|
|
match param.default {
|
|
Some(default) => {
|
|
try!(space(&mut s.s));
|
|
try!(s.word_space("="));
|
|
s.print_type(default)
|
|
}
|
|
_ => Ok(())
|
|
}
|
|
}
|
|
}));
|
|
word(&mut self.s, ">")
|
|
} else {
|
|
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, _) => {
|
|
// FIXME(#6993) can't compare identifiers directly here
|
|
if path.segments.last().unwrap().identifier.name != ident.name {
|
|
try!(self.print_ident(ident));
|
|
try!(space(&mut self.s));
|
|
try!(self.word_space("="));
|
|
}
|
|
self.print_path(path, false)
|
|
}
|
|
|
|
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| {
|
|
s.print_ident(w.node.name)
|
|
}));
|
|
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"));
|
|
try!(self.print_ident(id));
|
|
for &(ref p, style) in optional_path.iter() {
|
|
try!(space(&mut self.s));
|
|
try!(word(&mut self.s, "="));
|
|
try!(space(&mut self.s));
|
|
try!(self.print_string(p.get(), style));
|
|
}
|
|
}
|
|
|
|
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 path, _) if
|
|
path.segments.len() == 1 &&
|
|
path.segments.get(0).identifier.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_ty_fn(&mut self,
|
|
opt_abi: Option<abi::Abi>,
|
|
opt_sigil: Option<char>,
|
|
opt_region: &Option<ast::Lifetime>,
|
|
fn_style: ast::FnStyle,
|
|
onceness: ast::Onceness,
|
|
decl: &ast::FnDecl,
|
|
id: Option<ast::Ident>,
|
|
opt_bounds: &Option<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));
|
|
try!(self.print_onceness(onceness));
|
|
} 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!(self.print_onceness(onceness));
|
|
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());
|
|
}
|
|
|
|
opt_bounds.as_ref().map(|bounds| {
|
|
self.print_bounds(opt_region, bounds, true)
|
|
});
|
|
|
|
try!(self.maybe_print_comment(decl.output.span.lo));
|
|
|
|
match decl.output.node {
|
|
ast::TyNil => {}
|
|
_ => {
|
|
try!(self.space_if_not_bol());
|
|
try!(self.ibox(indent_unit));
|
|
try!(self.word_space("->"));
|
|
if decl.cf == ast::NoReturn {
|
|
try!(self.word_nbsp("!"));
|
|
} else {
|
|
try!(self.print_type(decl.output));
|
|
}
|
|
try!(self.end());
|
|
}
|
|
}
|
|
|
|
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::LitChar(ch) => {
|
|
let mut res = StrBuf::from_str("'");
|
|
ch.escape_default(|c| res.push_char(c));
|
|
res.push_char('\'');
|
|
word(&mut self.s, res.as_slice())
|
|
}
|
|
ast::LitInt(i, t) => {
|
|
word(&mut self.s,
|
|
ast_util::int_ty_to_str(t, Some(i),
|
|
ast_util::AutoSuffix).as_slice())
|
|
}
|
|
ast::LitUint(u, t) => {
|
|
word(&mut self.s,
|
|
ast_util::uint_ty_to_str(t, Some(u),
|
|
ast_util::ForceSuffix).as_slice())
|
|
}
|
|
ast::LitIntUnsuffixed(i) => {
|
|
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_str(t).as_slice()).as_slice())
|
|
}
|
|
ast::LitFloatUnsuffixed(ref f) => word(&mut self.s, f.get()),
|
|
ast::LitNil => word(&mut self.s, "()"),
|
|
ast::LitBool(val) => {
|
|
if val { word(&mut self.s, "true") } else { word(&mut self.s, "false") }
|
|
}
|
|
ast::LitBinary(ref arr) => {
|
|
try!(self.ibox(indent_unit));
|
|
try!(word(&mut self.s, "["));
|
|
try!(self.commasep_cmnt(Inconsistent,
|
|
arr.as_slice(),
|
|
|s, u| {
|
|
word(&mut s.s,
|
|
format!("{}",
|
|
*u).as_slice())
|
|
},
|
|
|_| lit.span));
|
|
try!(word(&mut self.s, "]"));
|
|
self.end()
|
|
}
|
|
}
|
|
}
|
|
|
|
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).get(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.get(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.get(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.get(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_str().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_str().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_str().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"),
|
|
}
|
|
}
|
|
|
|
pub fn print_onceness(&mut self, o: ast::Onceness) -> IoResult<()> {
|
|
match o {
|
|
ast::Once => self.word_nbsp("once"),
|
|
ast::Many => Ok(())
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod test {
|
|
use super::*;
|
|
|
|
use ast;
|
|
use ast_util;
|
|
use codemap;
|
|
use parse::token;
|
|
|
|
#[test]
|
|
fn test_fun_to_str() {
|
|
let abba_ident = token::str_to_ident("abba");
|
|
|
|
let decl = ast::FnDecl {
|
|
inputs: Vec::new(),
|
|
output: ast::P(ast::Ty {id: 0,
|
|
node: ast::TyNil,
|
|
span: codemap::DUMMY_SP}),
|
|
cf: ast::Return,
|
|
variadic: false
|
|
};
|
|
let generics = ast_util::empty_generics();
|
|
assert_eq!(&fun_to_str(&decl, ast::NormalFn, abba_ident,
|
|
None, &generics),
|
|
&"fn abba()".to_strbuf());
|
|
}
|
|
|
|
#[test]
|
|
fn test_variant_to_str() {
|
|
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_str(&var);
|
|
assert_eq!(&varstr,&"pub principal_skinner".to_strbuf());
|
|
}
|
|
}
|