1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 use visitor::FmtVisitor;
12 use lists::{write_list, ListFormatting, SeparatorTactic, ListTactic};
15 use syntax::codemap::Span;
16 use syntax::parse::token;
17 use syntax::print::pprust;
21 // TODO change import lists with one item to a single import
22 // remove empty lists (if they're even possible)
23 // TODO (some day) remove unused imports, expand globs, compress many single imports into a list import
25 impl<'a> FmtVisitor<'a> {
26 // Basically just pretty prints a multi-item import.
27 pub fn rewrite_use_list(&mut self,
29 path_list: &[ast::PathListItem],
30 vp_span: Span) -> String {
31 // FIXME remove unused imports
33 // FIXME check indentation
34 let l_loc = self.codemap.lookup_char_pos(vp_span.lo);
36 let path_str = pprust::path_to_string(&path);
39 let indent = l_loc.col.0 + path_str.len() + 3;
40 let fmt = ListFormatting {
41 tactic: ListTactic::Mixed,
43 trailing_separator: SeparatorTactic::Never,
46 h_width: IDEAL_WIDTH - (indent + path_str.len() + 2),
47 v_width: IDEAL_WIDTH - (indent + path_str.len() + 2),
50 // TODO handle any comments inbetween items.
51 // If `self` is in the list, put it first.
52 let head = if path_list.iter().any(|vpi|
53 if let ast::PathListItem_::PathListMod{ .. } = vpi.node {
59 Some(("self".to_string(), String::new()))
64 let items: Vec<_> = head.into_iter().chain(path_list.iter().filter_map(|vpi| {
66 ast::PathListItem_::PathListIdent{ name, .. } => {
67 Some((token::get_ident(name).to_string(), String::new()))
69 // Skip `self`, because we added it above.
70 ast::PathListItem_::PathListMod{ .. } => None,
74 format!("use {}::{{{}}};", path_str, write_list(&items, &fmt))