use syntax::source_map::{self, BytePos, Span, DUMMY_SP};
use comment::combine_strs_with_missing_comments;
-use config::IndentStyle;
+use config::{Edition, IndentStyle};
use lists::{definitive_tactic, itemize_list, write_list, ListFormatting, ListItem, Separator};
use rewrite::{Rewrite, RewriteContext};
use shape::Shape;
fn from_path_segment(
context: &RewriteContext,
path_seg: &ast::PathSegment,
+ modsep: bool,
) -> Option<UseSegment> {
let name = rewrite_ident(context, path_seg.ident);
if name.is_empty() || name == "{{root}}" {
return None;
}
- Some(if name == "self" {
- UseSegment::Slf(None)
- } else if name == "super" {
- UseSegment::Super(None)
- } else {
- UseSegment::Ident((*name).to_owned(), None)
+ Some(match name {
+ "self" => UseSegment::Slf(None),
+ "super" => UseSegment::Super(None),
+ _ => {
+ let mod_sep = if modsep { "::" } else { "" };
+ UseSegment::Ident(format!("{}{}", mod_sep, name), None)
+ }
})
}
}
fn merge_use_trees_inner(trees: &mut Vec<UseTree>, use_tree: UseTree) {
for tree in trees.iter_mut() {
if tree.share_prefix(&use_tree) {
- tree.merge(use_tree);
+ tree.merge(&use_tree);
return;
}
}
visibility,
attrs,
};
+
+ let leading_modsep = context.config.edition() == Edition::Edition2018
+ && a.prefix.to_string().len() > 2
+ && a.prefix.to_string().starts_with("::");
+
for p in &a.prefix.segments {
- if let Some(use_segment) = UseSegment::from_path_segment(context, p) {
+ if let Some(use_segment) = UseSegment::from_path_segment(context, p, leading_modsep) {
result.path.push(use_segment);
}
}
UseTreeKind::Simple(ref rename, ..) => {
let name = rewrite_ident(context, path_to_imported_ident(&a.prefix)).to_owned();
let alias = rename.and_then(|ident| {
- if ident == path_to_imported_ident(&a.prefix) {
+ if ident.name == "_" {
+ // for impl-only-use
+ Some("_".to_owned())
+ } else if ident == path_to_imported_ident(&a.prefix) {
None
} else {
Some(rewrite_ident(context, ident).to_owned())
}
});
-
- let segment = if &name == "self" {
- UseSegment::Slf(alias)
- } else if &name == "super" {
- UseSegment::Super(alias)
- } else {
- UseSegment::Ident(name, alias)
+ let segment = match name.as_ref() {
+ "self" => UseSegment::Slf(alias),
+ "super" => UseSegment::Super(alias),
+ _ => UseSegment::Ident(name, alias),
};
// `name` is already in result.
}
}
- fn merge(&mut self, other: UseTree) {
+ fn merge(&mut self, other: &UseTree) {
let mut new_path = vec![];
for (a, b) in self
.path
impl Rewrite for UseSegment {
fn rewrite(&self, context: &RewriteContext, shape: Shape) -> Option<String> {
- Some(match *self {
+ Some(match self {
UseSegment::Ident(ref ident, Some(ref rename)) => format!("{} as {}", ident, rename),
UseSegment::Ident(ref ident, None) => ident.clone(),
UseSegment::Slf(Some(ref rename)) => format!("self as {}", rename),