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Auto merge of #48917 - petrochenkov:import, r=oli-obk

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syntax: Make imports in AST closer to the source and cleanup their parsing

This is a continuation of https://github.com/rust-lang/rust/pull/45846 in some sense.
This commit is contained in:
bors 2018-03-18 01:50:52 +00:00
commit 5e3ecdce4e
39 changed files with 228 additions and 260 deletions
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6
src/librustc/hir/intravisit.rs
View file

@ -444,10 +444,10 @@ pub fn walk_item<'v, V: Visitor<'v>>(visitor: &mut V, item: &'v Item) {
visitor.visit_vis(&item.vis);
visitor.visit_name(item.span, item.name);
match item.node {
ItemExternCrate(opt_name) => {
ItemExternCrate(orig_name) => {
visitor.visit_id(item.id);
if let Some(name) = opt_name {
visitor.visit_name(item.span, name);
if let Some(orig_name) = orig_name {
visitor.visit_name(item.span, orig_name);
}
}
ItemUse(ref path, _) => {

33
src/librustc/hir/lowering.rs
View file

@ -879,7 +879,7 @@ impl<'a> LoweringContext<'a> {
TyKind::Slice(ref ty) => hir::TySlice(self.lower_ty(ty, itctx)),
TyKind::Ptr(ref mt) => hir::TyPtr(self.lower_mt(mt, itctx)),
TyKind::Rptr(ref region, ref mt) => {
let span = t.span.with_hi(t.span.lo());
let span = t.span.shrink_to_lo();
let lifetime = match *region {
Some(ref lt) => self.lower_lifetime(lt),
None => self.elided_lifetime(span)
@ -1355,17 +1355,11 @@ impl<'a> LoweringContext<'a> {
id: NodeId,
p: &Path,
name: Option<Name>,
param_mode: ParamMode,
defaults_to_global: bool)
param_mode: ParamMode)
-> hir::Path {
let mut segments = p.segments.iter();
if defaults_to_global && p.is_global() {
segments.next();
}
hir::Path {
def: self.expect_full_def(id),
segments: segments.map(|segment| {
segments: p.segments.iter().map(|segment| {
self.lower_path_segment(p.span, segment, param_mode, 0,
ParenthesizedGenericArgs::Err,
ImplTraitContext::Disallowed)
@ -1378,10 +1372,9 @@ impl<'a> LoweringContext<'a> {
fn lower_path(&mut self,
id: NodeId,
p: &Path,
param_mode: ParamMode,
defaults_to_global: bool)
param_mode: ParamMode)
-> hir::Path {
self.lower_path_extra(id, p, None, param_mode, defaults_to_global)
self.lower_path_extra(id, p, None, param_mode)
}
fn lower_path_segment(&mut self,
@ -1904,7 +1897,7 @@ impl<'a> LoweringContext<'a> {
i: &ItemKind)
-> hir::Item_ {
match *i {
ItemKind::ExternCrate(string) => hir::ItemExternCrate(string),
ItemKind::ExternCrate(orig_name) => hir::ItemExternCrate(orig_name),
ItemKind::Use(ref use_tree) => {
// Start with an empty prefix
let prefix = Path {
@ -2047,8 +2040,8 @@ impl<'a> LoweringContext<'a> {
let path = &tree.prefix;
match tree.kind {
UseTreeKind::Simple(ident) => {
*name = ident.name;
UseTreeKind::Simple(rename) => {
*name = tree.ident().name;
// First apply the prefix to the path
let mut path = Path {
@ -2064,12 +2057,12 @@ impl<'a> LoweringContext<'a> {
if path.segments.len() > 1 &&
path.segments.last().unwrap().identifier.name == keywords::SelfValue.name() {
let _ = path.segments.pop();
if ident.name == keywords::SelfValue.name() {
if rename.is_none() {
*name = path.segments.last().unwrap().identifier.name;
}
}
let path = P(self.lower_path(id, &path, ParamMode::Explicit, true));
let path = P(self.lower_path(id, &path, ParamMode::Explicit));
hir::ItemUse(path, hir::UseKind::Single)
}
UseTreeKind::Glob => {
@ -2080,7 +2073,7 @@ impl<'a> LoweringContext<'a> {
.cloned()
.collect(),
span: path.span,
}, ParamMode::Explicit, true));
}, ParamMode::Explicit));
hir::ItemUse(path, hir::UseKind::Glob)
}
UseTreeKind::Nested(ref trees) => {
@ -2136,7 +2129,7 @@ impl<'a> LoweringContext<'a> {
// Privatize the degenerate import base, used only to check
// the stability of `use a::{};`, to avoid it showing up as
// a re-export by accident when `pub`, e.g. in documentation.
let path = P(self.lower_path(id, &prefix, ParamMode::Explicit, true));
let path = P(self.lower_path(id, &prefix, ParamMode::Explicit));
*vis = hir::Inherited;
hir::ItemUse(path, hir::UseKind::ListStem)
}
@ -3379,7 +3372,7 @@ impl<'a> LoweringContext<'a> {
VisibilityKind::Crate(..) => hir::Visibility::Crate,
VisibilityKind::Restricted { ref path, id, .. } => {
hir::Visibility::Restricted {
path: P(self.lower_path(id, path, ParamMode::Explicit, true)),
path: P(self.lower_path(id, path, ParamMode::Explicit)),
id: if let Some(owner) = explicit_owner {
self.lower_node_id_with_owner(id, owner).node_id
} else {

4
src/librustc/hir/mod.rs
View file

@ -2011,9 +2011,9 @@ pub struct Item {
#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
pub enum Item_ {
/// An `extern crate` item, with optional original crate name,
/// An `extern crate` item, with optional *original* crate name if the crate was renamed.
///
/// e.g. `extern crate foo` or `extern crate foo_bar as foo`
/// E.g. `extern crate foo` or `extern crate foo_bar as foo`
ItemExternCrate(Option<Name>),
/// `use foo::bar::*;` or `use foo::bar::baz as quux;`

11
src/librustc/hir/print.rs
View file

@ -524,15 +524,10 @@ impl<'a> State<'a> {
self.print_outer_attributes(&item.attrs)?;
self.ann.pre(self, NodeItem(item))?;
match item.node {
hir::ItemExternCrate(ref optional_path) => {
hir::ItemExternCrate(orig_name) => {
self.head(&visibility_qualified(&item.vis, "extern crate"))?;
if let Some(p) = *optional_path {
let val = p.as_str();
if val.contains("-") {
self.print_string(&val, ast::StrStyle::Cooked)?;
} else {
self.print_name(p)?;
}
if let Some(orig_name) = orig_name {
self.print_name(orig_name)?;
self.s.space()?;
self.s.word("as")?;
self.s.space()?;

2
src/librustc/ich/impls_hir.rs
View file

@ -851,7 +851,7 @@ impl<'a> HashStable<StableHashingContext<'a>> for hir::Item {
}
impl_stable_hash_for!(enum hir::Item_ {
ItemExternCrate(name),
ItemExternCrate(orig_name),
ItemUse(path, use_kind),
ItemStatic(ty, mutability, body_id),
ItemConst(ty, body_id),

2
src/librustc/session/config.rs
View file

@ -385,7 +385,7 @@ top_level_options!(
externs: Externs [UNTRACKED],
crate_name: Option<String> [TRACKED],
// An optional name to use as the crate for std during std injection,
// written `extern crate std = "name"`. Default to "std". Used by
// written `extern crate name as std`. Defaults to `std`. Used by
// out-of-tree drivers.
alt_std_name: Option<String> [TRACKED],
// Indicates how the compiler should treat unstable features

2
src/librustc_allocator/expand.rs
View file

@ -99,7 +99,7 @@ impl<'a> Folder for ExpandAllocatorDirectives<'a> {
f.cx.item_extern_crate(f.span, f.alloc),
f.cx.item_use_simple(
f.span,
respan(f.span.empty(), VisibilityKind::Inherited),
respan(f.span.shrink_to_lo(), VisibilityKind::Inherited),
super_path,
),
];

2
src/librustc_driver/driver.rs
View file

@ -683,7 +683,7 @@ pub fn phase_2_configure_and_expand_inner<'a, F>(sess: &'a Session,
});
krate = time(sess, "crate injection", || {
let alt_std_name = sess.opts.alt_std_name.clone();
let alt_std_name = sess.opts.alt_std_name.as_ref().map(|s| &**s);
syntax::std_inject::maybe_inject_crates_ref(krate, alt_std_name)
});

4
src/librustc_lint/builtin.rs
View file

@ -1082,7 +1082,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for InvalidNoMangleItems {
if !cx.access_levels.is_reachable(it.id) {
let msg = "function is marked #[no_mangle], but not exported";
let mut err = cx.struct_span_lint(PRIVATE_NO_MANGLE_FNS, it.span, msg);
let insertion_span = it.span.with_hi(it.span.lo());
let insertion_span = it.span.shrink_to_lo();
if it.vis == hir::Visibility::Inherited {
err.span_suggestion(insertion_span,
"try making it public",
@ -1107,7 +1107,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for InvalidNoMangleItems {
!cx.access_levels.is_reachable(it.id) {
let msg = "static is marked #[no_mangle], but not exported";
let mut err = cx.struct_span_lint(PRIVATE_NO_MANGLE_STATICS, it.span, msg);
let insertion_span = it.span.with_hi(it.span.lo());
let insertion_span = it.span.shrink_to_lo();
if it.vis == hir::Visibility::Inherited {
err.span_suggestion(insertion_span,
"try making it public",

7
src/librustc_lint/unused.rs
View file

@ -377,11 +377,12 @@ impl UnusedImportBraces {
// Trigger the lint if the nested item is a non-self single item
let node_ident;
match items[0].0.kind {
ast::UseTreeKind::Simple(ident) => {
if ident.name == keywords::SelfValue.name() {
ast::UseTreeKind::Simple(rename) => {
let orig_ident = items[0].0.prefix.segments.last().unwrap().identifier;
if orig_ident.name == keywords::SelfValue.name() {
return;
} else {
node_ident = ident;
node_ident = rename.unwrap_or(orig_ident);
}
}
ast::UseTreeKind::Glob => {

16
src/librustc_metadata/creader.rs
View file

@ -1055,12 +1055,14 @@ impl<'a> middle::cstore::CrateLoader for CrateLoader<'a> {
fn process_item(&mut self, item: &ast::Item, definitions: &Definitions) {
match item.node {
ast::ItemKind::ExternCrate(rename) => {
debug!("resolving extern crate stmt. ident: {} rename: {:?}", item.ident, rename);
let rename = match rename {
Some(rename) => {
validate_crate_name(Some(self.sess), &rename.as_str(), Some(item.span));
rename
ast::ItemKind::ExternCrate(orig_name) => {
debug!("resolving extern crate stmt. ident: {} orig_name: {:?}",
item.ident, orig_name);
let orig_name = match orig_name {
Some(orig_name) => {
validate_crate_name(Some(self.sess), &orig_name.as_str(),
Some(item.span));
orig_name
}
None => item.ident.name,
};
@ -1071,7 +1073,7 @@ impl<'a> middle::cstore::CrateLoader for CrateLoader<'a> {
};
let (cnum, ..) = self.resolve_crate(
&None, item.ident.name, rename, None, item.span, PathKind::Crate, dep_kind,
&None, item.ident.name, orig_name, None, item.span, PathKind::Crate, dep_kind,
);
let def_id = definitions.opt_local_def_id(item.id).unwrap();

2
src/librustc_metadata/cstore_impl.rs
View file

@ -533,7 +533,7 @@ impl CrateStore for cstore::CStore {
tokens: body.into(),
legacy: def.legacy,
}),
vis: codemap::respan(local_span.empty(), ast::VisibilityKind::Inherited),
vis: codemap::respan(local_span.shrink_to_lo(), ast::VisibilityKind::Inherited),
tokens: None,
})
}

2
src/librustc_mir/build/mod.rs
View file

@ -422,7 +422,7 @@ fn construct_fn<'a, 'gcx, 'tcx, A>(hir: Cx<'a, 'gcx, 'tcx>,
builder.args_and_body(block, &arguments, arg_scope, &body.value)
}));
// Attribute epilogue to function's closing brace
let fn_end = span.with_lo(span.hi());
let fn_end = span.shrink_to_hi();
let source_info = builder.source_info(fn_end);
let return_block = builder.return_block();
builder.cfg.terminate(block, source_info,

19
src/librustc_resolve/build_reduced_graph.rs
View file

@ -119,7 +119,8 @@ impl<'a> Resolver<'a> {
.collect();
match use_tree.kind {
ast::UseTreeKind::Simple(mut ident) => {
ast::UseTreeKind::Simple(rename) => {
let mut ident = use_tree.ident();
let mut source = module_path.pop().unwrap().node;
let mut type_ns_only = false;
@ -142,7 +143,7 @@ impl<'a> Resolver<'a> {
// Replace `use foo::self;` with `use foo;`
let _ = module_path.pop();
source = last_segment.node;
if ident.name == keywords::SelfValue.name() {
if rename.is_none() {
ident = last_segment.node;
}
}
@ -162,7 +163,7 @@ impl<'a> Resolver<'a> {
ModuleKind::Block(..) => unreachable!(),
};
source.name = crate_name;
if ident.name == keywords::DollarCrate.name() {
if rename.is_none() {
ident.name = crate_name;
}
@ -206,8 +207,8 @@ impl<'a> Resolver<'a> {
// Ensure there is at most one `self` in the list
let self_spans = items.iter().filter_map(|&(ref use_tree, _)| {
if let ast::UseTreeKind::Simple(ident) = use_tree.kind {
if ident.name == keywords::SelfValue.name() {
if let ast::UseTreeKind::Simple(..) = use_tree.kind {
if use_tree.ident().name == keywords::SelfValue.name() {
return Some(use_tree.span);
}
}
@ -244,9 +245,9 @@ impl<'a> Resolver<'a> {
match item.node {
ItemKind::Use(ref use_tree) => {
// Just an empty prefix to start out
// Imports are resolved as global by default, add starting root segment.
let prefix = ast::Path {
segments: vec![],
segments: use_tree.prefix.make_root().into_iter().collect(),
span: use_tree.span,
};
@ -255,7 +256,7 @@ impl<'a> Resolver<'a> {
);
}
ItemKind::ExternCrate(as_name) => {
ItemKind::ExternCrate(orig_name) => {
self.crate_loader.process_item(item, &self.definitions);
// n.b. we don't need to look at the path option here, because cstore already did
@ -274,7 +275,7 @@ impl<'a> Resolver<'a> {
id: item.id,
parent,
imported_module: Cell::new(Some(module)),
subclass: ImportDirectiveSubclass::ExternCrate(as_name),
subclass: ImportDirectiveSubclass::ExternCrate(orig_name),
span: item.span,
module_path: Vec::new(),
vis: Cell::new(vis),

25
src/librustc_resolve/lib.rs
View file

@ -756,7 +756,7 @@ impl<'tcx> Visitor<'tcx> for UsePlacementFinder {
// don't suggest placing a use before the prelude
// import or other generated ones
if item.span.ctxt().outer().expn_info().is_none() {
self.span = Some(item.span.with_hi(item.span.lo()));
self.span = Some(item.span.shrink_to_lo());
self.found_use = true;
return;
}
@ -768,12 +768,12 @@ impl<'tcx> Visitor<'tcx> for UsePlacementFinder {
if item.span.ctxt().outer().expn_info().is_none() {
// don't insert between attributes and an item
if item.attrs.is_empty() {
self.span = Some(item.span.with_hi(item.span.lo()));
self.span = Some(item.span.shrink_to_lo());
} else {
// find the first attribute on the item
for attr in &item.attrs {
if self.span.map_or(true, |span| attr.span < span) {
self.span = Some(attr.span.with_hi(attr.span.lo()));
self.span = Some(attr.span.shrink_to_lo());
}
}
}
@ -2164,8 +2164,9 @@ impl<'a> Resolver<'a> {
}
ItemKind::Use(ref use_tree) => {
// Imports are resolved as global by default, add starting root segment.
let path = Path {
segments: vec![],
segments: use_tree.prefix.make_root().into_iter().collect(),
span: use_tree.span,
};
self.resolve_use_tree(item.id, use_tree, &path);
@ -2300,7 +2301,6 @@ impl<'a> Resolver<'a> {
None,
&path,
trait_ref.path.span,
trait_ref.path.segments.last().unwrap().span,
PathSource::Trait(AliasPossibility::No)
).base_def();
if def != Def::Err {
@ -2731,8 +2731,7 @@ impl<'a> Resolver<'a> {
let segments = &path.segments.iter()
.map(|seg| respan(seg.span, seg.identifier))
.collect::<Vec<_>>();
let ident_span = path.segments.last().map_or(path.span, |seg| seg.span);
self.smart_resolve_path_fragment(id, qself, segments, path.span, ident_span, source)
self.smart_resolve_path_fragment(id, qself, segments, path.span, source)
}
fn smart_resolve_path_fragment(&mut self,
@ -2740,9 +2739,9 @@ impl<'a> Resolver<'a> {
qself: Option<&QSelf>,
path: &[SpannedIdent],
span: Span,
ident_span: Span,
source: PathSource)
-> PathResolution {
let ident_span = path.last().map_or(span, |ident| ident.span);
let ns = source.namespace();
let is_expected = &|def| source.is_expected(def);
let is_enum_variant = &|def| if let Def::Variant(..) = def { true } else { false };
@ -3090,7 +3089,7 @@ impl<'a> Resolver<'a> {
// Make sure `A::B` in `<T as A>::B::C` is a trait item.
let ns = if qself.position + 1 == path.len() { ns } else { TypeNS };
let res = self.smart_resolve_path_fragment(id, None, &path[..qself.position + 1],
span, span, PathSource::TraitItem(ns));
span, PathSource::TraitItem(ns));
return Some(PathResolution::with_unresolved_segments(
res.base_def(), res.unresolved_segments() + path.len() - qself.position - 1
));
@ -3941,8 +3940,12 @@ impl<'a> Resolver<'a> {
ty::Visibility::Restricted(self.current_module.normal_ancestor_id)
}
ast::VisibilityKind::Restricted { ref path, id, .. } => {
let def = self.smart_resolve_path(id, None, path,
PathSource::Visibility).base_def();
// Visibilities are resolved as global by default, add starting root segment.
let segments = path.make_root().iter().chain(path.segments.iter())
.map(|seg| respan(seg.span, seg.identifier))
.collect::<Vec<_>>();
let def = self.smart_resolve_path_fragment(id, None, &segments, path.span,
PathSource::Visibility).base_def();
if def == Def::Err {
ty::Visibility::Public
} else {

9
src/librustc_resolve/resolve_imports.rs
View file

@ -667,11 +667,10 @@ impl<'a, 'b:'a> ImportResolver<'a, 'b> {
}
PathResult::Failed(span, msg, true) => {
let (mut self_path, mut self_result) = (module_path.clone(), None);
if !self_path.is_empty() &&
!token::Ident(self_path[0].node).is_path_segment_keyword() &&
!(self_path.len() > 1 &&
token::Ident(self_path[1].node).is_path_segment_keyword())
{
let is_special = |ident| token::Ident(ident).is_path_segment_keyword() &&
ident.name != keywords::CrateRoot.name();
if !self_path.is_empty() && !is_special(self_path[0].node) &&
!(self_path.len() > 1 && is_special(self_path[1].node)) {
self_path[0].node.name = keywords::SelfValue.name();
self_result = Some(self.resolve_path(&self_path, None, false, span));
}

5
src/librustc_save_analysis/dump_visitor.rs
View file

@ -1209,7 +1209,7 @@ impl<'l, 'tcx: 'l, 'll, O: DumpOutput + 'll> DumpVisitor<'l, 'tcx, 'll, O> {
fn process_trait_item(&mut self, trait_item: &'l ast::TraitItem, trait_id: DefId) {
self.process_macro_use(trait_item.span);
let vis_span = trait_item.span.empty();
let vis_span = trait_item.span.shrink_to_lo();
match trait_item.node {
ast::TraitItemKind::Const(ref ty, ref expr) => {
self.process_assoc_const(
@ -1342,7 +1342,8 @@ impl<'l, 'tcx: 'l, 'll, O: DumpOutput + 'll> DumpVisitor<'l, 'tcx, 'll, O> {
.map(::id_from_def_id);
match use_tree.kind {
ast::UseTreeKind::Simple(ident) => {
ast::UseTreeKind::Simple(..) => {
let ident = use_tree.ident();
let path = ast::Path {
segments: prefix.segments
.iter()

6
src/librustc_typeck/check/method/suggest.rs
View file

@ -767,7 +767,7 @@ impl<'a, 'tcx, 'gcx> hir::intravisit::Visitor<'tcx> for UsePlacementFinder<'a, '
// don't suggest placing a use before the prelude
// import or other generated ones
if item.span.ctxt().outer().expn_info().is_none() {
self.span = Some(item.span.with_hi(item.span.lo()));
self.span = Some(item.span.shrink_to_lo());
self.found_use = true;
return;
}
@ -779,12 +779,12 @@ impl<'a, 'tcx, 'gcx> hir::intravisit::Visitor<'tcx> for UsePlacementFinder<'a, '
if item.span.ctxt().outer().expn_info().is_none() {
// don't insert between attributes and an item
if item.attrs.is_empty() {
self.span = Some(item.span.with_hi(item.span.lo()));
self.span = Some(item.span.shrink_to_lo());
} else {
// find the first attribute on the item
for attr in &item.attrs {
if self.span.map_or(true, |span| attr.span < span) {
self.span = Some(attr.span.with_hi(attr.span.lo()));
self.span = Some(attr.span.shrink_to_lo());
}
}
}

2
src/librustc_typeck/check/mod.rs
View file

@ -2520,7 +2520,7 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
if sugg_unit {
let sugg_span = sess.codemap().end_point(expr_sp);
// remove closing `)` from the span
let sugg_span = sugg_span.with_hi(sugg_span.lo());
let sugg_span = sugg_span.shrink_to_lo();
err.span_suggestion(
sugg_span,
"expected the unit value `()`; create it with empty parentheses",

4
src/librustdoc/visit_ast.rs
View file

@ -406,13 +406,13 @@ impl<'a, 'tcx, 'rcx> RustdocVisitor<'a, 'tcx, 'rcx> {
// If we're inlining, skip private items.
_ if self.inlining && item.vis != hir::Public => {}
hir::ItemGlobalAsm(..) => {}
hir::ItemExternCrate(ref p) => {
hir::ItemExternCrate(orig_name) => {
let def_id = self.cx.tcx.hir.local_def_id(item.id);
om.extern_crates.push(ExternCrate {
cnum: self.cx.tcx.extern_mod_stmt_cnum(def_id)
.unwrap_or(LOCAL_CRATE),
name,
path: p.map(|x|x.to_string()),
path: orig_name.map(|x|x.to_string()),
vis: item.vis.clone(),
attrs: item.attrs.clone(),
whence: item.span,

42
src/libsyntax/ast.rs
View file

@ -108,17 +108,16 @@ impl Path {
}
}
// Add starting "crate root" segment to all paths except those that
// already have it or start with `self`, `super`, `Self` or `$crate`.
pub fn default_to_global(mut self) -> Path {
if !self.is_global() {
let ident = self.segments[0].identifier;
if !::parse::token::Ident(ident).is_path_segment_keyword() ||
ident.name == keywords::Crate.name() {
self.segments.insert(0, PathSegment::crate_root(self.span));
// Make a "crate root" segment for this path unless it already has it
// or starts with something like `self`/`super`/`$crate`/etc.
pub fn make_root(&self) -> Option<PathSegment> {
if let Some(ident) = self.segments.get(0).map(|seg| seg.identifier) {
if ::parse::token::Ident(ident).is_path_segment_keyword() &&
ident.name != keywords::Crate.name() {
return None;
}
}
self
Some(PathSegment::crate_root(self.span.shrink_to_lo()))
}
pub fn is_global(&self) -> bool {
@ -1878,20 +1877,37 @@ pub struct Variant_ {
pub type Variant = Spanned<Variant_>;
/// Part of `use` item to the right of its prefix.
#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
pub enum UseTreeKind {
Simple(Ident),
Glob,
/// `use prefix` or `use prefix as rename`
Simple(Option<Ident>),
/// `use prefix::{...}`
Nested(Vec<(UseTree, NodeId)>),
/// `use prefix::*`
Glob,
}
/// A tree of paths sharing common prefixes.
/// Used in `use` items both at top-level and inside of braces in import groups.
#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
pub struct UseTree {
pub kind: UseTreeKind,
pub prefix: Path,
pub kind: UseTreeKind,
pub span: Span,
}
impl UseTree {
pub fn ident(&self) -> Ident {
match self.kind {
UseTreeKind::Simple(Some(rename)) => rename,
UseTreeKind::Simple(None) =>
self.prefix.segments.last().expect("empty prefix in a simple import").identifier,
_ => panic!("`UseTree::ident` can only be used on a simple import"),
}
}
}
/// Distinguishes between Attributes that decorate items and Attributes that
/// are contained as statements within items. These two cases need to be
/// distinguished for pretty-printing.
@ -2055,7 +2071,7 @@ pub struct Item {
#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
pub enum ItemKind {
/// An `extern crate` item, with optional original crate name.
/// An `extern crate` item, with optional *original* crate name if the crate was renamed.
///
/// E.g. `extern crate foo` or `extern crate foo_bar as foo`
ExternCrate(Option<Name>),

2
src/libsyntax/diagnostics/plugin.rs
View file

@ -220,7 +220,7 @@ pub fn expand_build_diagnostic_array<'cx>(ecx: &'cx mut ExtCtxt,
ty,
expr,
),
vis: codemap::respan(span.empty(), ast::VisibilityKind::Public),
vis: codemap::respan(span.shrink_to_lo(), ast::VisibilityKind::Public),
span,
tokens: None,
})

25
src/libsyntax/ext/build.rs
View file

@ -294,7 +294,7 @@ pub trait AstBuilder {
vis: ast::Visibility, vp: P<ast::UseTree>) -> P<ast::Item>;
fn item_use_simple(&self, sp: Span, vis: ast::Visibility, path: ast::Path) -> P<ast::Item>;
fn item_use_simple_(&self, sp: Span, vis: ast::Visibility,
ident: ast::Ident, path: ast::Path) -> P<ast::Item>;
ident: Option<ast::Ident>, path: ast::Path) -> P<ast::Item>;
fn item_use_list(&self, sp: Span, vis: ast::Visibility,
path: Vec<ast::Ident>, imports: &[ast::Ident]) -> P<ast::Item>;
fn item_use_glob(&self, sp: Span,
@ -329,9 +329,13 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
None
};
segments.push(ast::PathSegment { identifier: last_identifier, span, parameters });
let path = ast::Path { span, segments };
if global { path.default_to_global() } else { path }
let mut path = ast::Path { span, segments };
if global {
if let Some(seg) = path.make_root() {
path.segments.insert(0, seg);
}
}
path
}
/// Constructs a qualified path.
@ -983,7 +987,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
attrs,
id: ast::DUMMY_NODE_ID,
node,
vis: respan(span.empty(), ast::VisibilityKind::Inherited),
vis: respan(span.shrink_to_lo(), ast::VisibilityKind::Inherited),
span,
tokens: None,
})
@ -1029,7 +1033,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
span: ty.span,
ty,
ident: None,
vis: respan(span.empty(), ast::VisibilityKind::Inherited),
vis: respan(span.shrink_to_lo(), ast::VisibilityKind::Inherited),
attrs: Vec::new(),
id: ast::DUMMY_NODE_ID,
}
@ -1159,16 +1163,15 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
}
fn item_use_simple(&self, sp: Span, vis: ast::Visibility, path: ast::Path) -> P<ast::Item> {
let last = path.segments.last().unwrap().identifier;
self.item_use_simple_(sp, vis, last, path)
self.item_use_simple_(sp, vis, None, path)
}
fn item_use_simple_(&self, sp: Span, vis: ast::Visibility,
ident: ast::Ident, path: ast::Path) -> P<ast::Item> {
rename: Option<ast::Ident>, path: ast::Path) -> P<ast::Item> {
self.item_use(sp, vis, P(ast::UseTree {
span: sp,
prefix: path,
kind: ast::UseTreeKind::Simple(ident),
kind: ast::UseTreeKind::Simple(rename),
}))
}
@ -1178,7 +1181,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
(ast::UseTree {
span: sp,
prefix: self.path(sp, vec![*id]),
kind: ast::UseTreeKind::Simple(*id),
kind: ast::UseTreeKind::Simple(None),
}, ast::DUMMY_NODE_ID)
}).collect();

2
src/libsyntax/ext/expand.rs
View file

@ -239,7 +239,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
node: ast::ItemKind::Mod(krate.module),
ident: keywords::Invalid.ident(),
id: ast::DUMMY_NODE_ID,
vis: respan(krate.span.empty(), ast::VisibilityKind::Public),
vis: respan(krate.span.shrink_to_lo(), ast::VisibilityKind::Public),
tokens: None,
})));

2
src/libsyntax/ext/quote.rs
View file

@ -857,7 +857,7 @@ fn expand_wrapper(cx: &ExtCtxt,
let path = path.iter().map(|s| s.to_string()).collect();
let use_item = cx.item_use_glob(
sp,
respan(sp.empty(), ast::VisibilityKind::Inherited),
respan(sp.shrink_to_lo(), ast::VisibilityKind::Inherited),
ids_ext(path),
);
cx.stmt_item(sp, use_item)

2
src/libsyntax/feature_gate.rs
View file

@ -1438,7 +1438,7 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
}
fn visit_use_tree(&mut self, use_tree: &'a ast::UseTree, id: NodeId, _nested: bool) {
if let ast::UseTreeKind::Simple(ident) = use_tree.kind {
if let ast::UseTreeKind::Simple(Some(ident)) = use_tree.kind {
if ident.name == "_" {
gate_feature_post!(&self, underscore_imports, use_tree.span,
"renaming imports with `_` is unstable");

7
src/libsyntax/fold.rs
View file

@ -323,7 +323,8 @@ pub fn noop_fold_use_tree<T: Folder>(use_tree: UseTree, fld: &mut T) -> UseTree
span: fld.new_span(use_tree.span),
prefix: fld.fold_path(use_tree.prefix),
kind: match use_tree.kind {
UseTreeKind::Simple(ident) => UseTreeKind::Simple(fld.fold_ident(ident)),
UseTreeKind::Simple(rename) =>
UseTreeKind::Simple(rename.map(|ident| fld.fold_ident(ident))),
UseTreeKind::Glob => UseTreeKind::Glob,
UseTreeKind::Nested(items) => UseTreeKind::Nested(items.move_map(|(tree, id)| {
(fld.fold_use_tree(tree), fld.new_id(id))
@ -886,7 +887,7 @@ pub fn noop_fold_block<T: Folder>(b: P<Block>, folder: &mut T) -> P<Block> {
pub fn noop_fold_item_kind<T: Folder>(i: ItemKind, folder: &mut T) -> ItemKind {
match i {
ItemKind::ExternCrate(string) => ItemKind::ExternCrate(string),
ItemKind::ExternCrate(orig_name) => ItemKind::ExternCrate(orig_name),
ItemKind::Use(use_tree) => {
ItemKind::Use(use_tree.map(|tree| folder.fold_use_tree(tree)))
}
@ -1018,7 +1019,7 @@ pub fn noop_fold_crate<T: Folder>(Crate {module, attrs, span}: Crate,
ident: keywords::Invalid.ident(),
attrs,
id: ast::DUMMY_NODE_ID,
vis: respan(span.empty(), ast::VisibilityKind::Public),
vis: respan(span.shrink_to_lo(), ast::VisibilityKind::Public),
span,
node: ast::ItemKind::Mod(module),
tokens: None,

2
src/libsyntax/parse/lexer/mod.rs
View file

@ -214,7 +214,7 @@ impl<'a> StringReader<'a> {
// Make the range zero-length if the span is invalid.
if span.lo() > span.hi() || begin.fm.start_pos != end.fm.start_pos {
span = span.with_hi(span.lo());
span = span.shrink_to_lo();
}
let mut sr = StringReader::new_raw_internal(sess, begin.fm);

2
src/libsyntax/parse/mod.rs
View file

@ -713,7 +713,7 @@ mod tests {
id: ast::DUMMY_NODE_ID,
node: ast::ExprKind::Path(None, ast::Path {
span: sp(0, 6),
segments: vec![ast::PathSegment::crate_root(sp(0, 2)),
segments: vec![ast::PathSegment::crate_root(sp(0, 0)),
str2seg("a", 2, 3),
str2seg("b", 5, 6)]
}),

116
src/libsyntax/parse/parser.rs
View file

@ -1508,7 +1508,7 @@ impl<'a> Parser<'a> {
if self.eat(&token::RArrow) {
Ok(FunctionRetTy::Ty(self.parse_ty_common(allow_plus, true)?))
} else {
Ok(FunctionRetTy::Default(self.span.with_hi(self.span.lo())))
Ok(FunctionRetTy::Default(self.span.shrink_to_lo()))
}
}
@ -1986,7 +1986,7 @@ impl<'a> Parser<'a> {
let lo = self.meta_var_span.unwrap_or(self.span);
let mut segments = Vec::new();
if self.eat(&token::ModSep) {
segments.push(PathSegment::crate_root(lo));
segments.push(PathSegment::crate_root(lo.shrink_to_lo()));
}
self.parse_path_segments(&mut segments, style, enable_warning)?;
@ -2021,7 +2021,7 @@ impl<'a> Parser<'a> {
loop {
segments.push(self.parse_path_segment(style, enable_warning)?);
if self.is_import_coupler(false) || !self.eat(&token::ModSep) {
if self.is_import_coupler() || !self.eat(&token::ModSep) {
return Ok(());
}
}
@ -5863,7 +5863,7 @@ impl<'a> Parser<'a> {
// `pub(in path)`
self.bump(); // `(`
self.bump(); // `in`
let path = self.parse_path(PathStyle::Mod)?.default_to_global(); // `path`
let path = self.parse_path(PathStyle::Mod)?; // `path`
self.expect(&token::CloseDelim(token::Paren))?; // `)`
let vis = respan(lo.to(self.prev_span), VisibilityKind::Restricted {
path: P(path),
@ -5876,7 +5876,7 @@ impl<'a> Parser<'a> {
{
// `pub(self)` or `pub(super)`
self.bump(); // `(`
let path = self.parse_path(PathStyle::Mod)?.default_to_global(); // `super`/`self`
let path = self.parse_path(PathStyle::Mod)?; // `super`/`self`
self.expect(&token::CloseDelim(token::Paren))?; // `)`
let vis = respan(lo.to(self.prev_span), VisibilityKind::Restricted {
path: P(path),
@ -6285,23 +6285,17 @@ impl<'a> Parser<'a> {
lo: Span,
visibility: Visibility,
attrs: Vec<Attribute>)
-> PResult<'a, P<Item>> {
let crate_name = self.parse_ident()?;
let (maybe_path, ident) = if let Some(ident) = self.parse_rename()? {
(Some(crate_name.name), ident)
-> PResult<'a, P<Item>> {
let orig_name = self.parse_ident()?;
let (item_name, orig_name) = if let Some(rename) = self.parse_rename()? {
(rename, Some(orig_name.name))
} else {
(None, crate_name)
(orig_name, None)
};
self.expect(&token::Semi)?;
let prev_span = self.prev_span;
Ok(self.mk_item(lo.to(prev_span),
ident,
ItemKind::ExternCrate(maybe_path),
visibility,
attrs))
let span = lo.to(self.prev_span);
Ok(self.mk_item(span, item_name, ItemKind::ExternCrate(orig_name), visibility, attrs))
}
/// Parse `extern` for foreign ABIs
@ -6480,12 +6474,11 @@ impl<'a> Parser<'a> {
if self.eat_keyword(keywords::Use) {
// USE ITEM
let item_ = ItemKind::Use(P(self.parse_use_tree(false)?));
let item_ = ItemKind::Use(P(self.parse_use_tree()?));
self.expect(&token::Semi)?;
let prev_span = self.prev_span;
let invalid = keywords::Invalid.ident();
let item = self.mk_item(lo.to(prev_span), invalid, item_, visibility, attrs);
let span = lo.to(self.prev_span);
let item = self.mk_item(span, keywords::Invalid.ident(), item_, visibility, attrs);
return Ok(Some(item));
}
@ -6960,90 +6953,53 @@ impl<'a> Parser<'a> {
}))
}
/// `{` or `::{` or `*` or `::*`
/// `::{` or `::*` (also `{` or `*` if unprefixed is true)
fn is_import_coupler(&mut self, unprefixed: bool) -> bool {
self.is_import_coupler_inner(&token::OpenDelim(token::Brace), unprefixed) ||
self.is_import_coupler_inner(&token::BinOp(token::Star), unprefixed)
}
fn is_import_coupler_inner(&mut self, token: &token::Token, unprefixed: bool) -> bool {
if self.check(&token::ModSep) {
self.look_ahead(1, |t| t == token)
} else if unprefixed {
self.check(token)
} else {
false
}
/// `::{` or `::*`
fn is_import_coupler(&mut self) -> bool {
self.check(&token::ModSep) &&
self.look_ahead(1, |t| *t == token::OpenDelim(token::Brace) ||
*t == token::BinOp(token::Star))
}
/// Parse UseTree
///
/// USE_TREE = `*` |
/// `{` USE_TREE_LIST `}` |
/// USE_TREE = [`::`] `*` |
/// [`::`] `{` USE_TREE_LIST `}` |
/// PATH `::` `*` |
/// PATH `::` `{` USE_TREE_LIST `}` |
/// PATH [`as` IDENT]
fn parse_use_tree(&mut self, nested: bool) -> PResult<'a, UseTree> {
fn parse_use_tree(&mut self) -> PResult<'a, UseTree> {
let lo = self.span;
let mut prefix = ast::Path {
segments: vec![],
span: lo.to(self.span),
};
let kind = if self.is_import_coupler(true) {
// `use *;` or `use ::*;` or `use {...};` `use ::{...};`
// Remove the first `::`
let mut prefix = ast::Path { segments: Vec::new(), span: lo.shrink_to_lo() };
let kind = if self.check(&token::OpenDelim(token::Brace)) ||
self.check(&token::BinOp(token::Star)) ||
self.is_import_coupler() {
// `use *;` or `use ::*;` or `use {...};` or `use ::{...};`
if self.eat(&token::ModSep) {
prefix.segments.push(PathSegment::crate_root(self.prev_span));
} else if !nested {
prefix.segments.push(PathSegment::crate_root(self.span));
prefix.segments.push(PathSegment::crate_root(lo.shrink_to_lo()));
}
if self.eat(&token::BinOp(token::Star)) {
// `use *;`
UseTreeKind::Glob
} else if self.check(&token::OpenDelim(token::Brace)) {
// `use {...};`
UseTreeKind::Nested(self.parse_use_tree_list()?)
} else {
return self.unexpected();
UseTreeKind::Nested(self.parse_use_tree_list()?)
}
} else {
// `use path::...;`
let mut parsed = self.parse_path(PathStyle::Mod)?;
if !nested {
parsed = parsed.default_to_global();
}
prefix.segments.append(&mut parsed.segments);
prefix.span = prefix.span.to(parsed.span);
// `use path::*;` or `use path::{...};` or `use path;` or `use path as bar;`
prefix = self.parse_path(PathStyle::Mod)?;
if self.eat(&token::ModSep) {
if self.eat(&token::BinOp(token::Star)) {
// `use path::*;`
UseTreeKind::Glob
} else if self.check(&token::OpenDelim(token::Brace)) {
// `use path::{...};`
UseTreeKind::Nested(self.parse_use_tree_list()?)
} else {
return self.unexpected();
UseTreeKind::Nested(self.parse_use_tree_list()?)
}
} else {
// `use path::foo;` or `use path::foo as bar;`
let rename = self.parse_rename()?.
unwrap_or(prefix.segments.last().unwrap().identifier);
UseTreeKind::Simple(rename)
UseTreeKind::Simple(self.parse_rename()?)
}
};
Ok(UseTree {
span: lo.to(self.prev_span),
kind,
prefix,
})
Ok(UseTree { prefix, kind, span: lo.to(self.prev_span) })
}
/// Parse UseTreeKind::Nested(list)
@ -7053,7 +7009,7 @@ impl<'a> Parser<'a> {
self.parse_unspanned_seq(&token::OpenDelim(token::Brace),
&token::CloseDelim(token::Brace),
SeqSep::trailing_allowed(token::Comma), |this| {
Ok((this.parse_use_tree(true)?, ast::DUMMY_NODE_ID))
Ok((this.parse_use_tree()?, ast::DUMMY_NODE_ID))
})
}

1
src/libsyntax/parse/token.rs
View file

@ -361,6 +361,7 @@ impl Token {
id.name == keywords::SelfType.name() ||
id.name == keywords::Extern.name() ||
id.name == keywords::Crate.name() ||
id.name == keywords::CrateRoot.name() ||
id.name == keywords::DollarCrate.name(),
None => false,
}

65
src/libsyntax/print/pprust.rs
View file

@ -352,7 +352,7 @@ pub fn fn_block_to_string(p: &ast::FnDecl) -> String {
}
pub fn path_to_string(p: &ast::Path) -> String {
to_string(|s| s.print_path(p, false, 0, false))
to_string(|s| s.print_path(p, false, 0))
}
pub fn path_segment_to_string(p: &ast::PathSegment) -> String {
@ -1050,7 +1050,7 @@ impl<'a> State<'a> {
&f.generic_params)?;
}
ast::TyKind::Path(None, ref path) => {
self.print_path(path, false, 0, false)?;
self.print_path(path, false, 0)?;
}
ast::TyKind::Path(Some(ref qself), ref path) => {
self.print_qpath(path, qself, false)?
@ -1173,15 +1173,10 @@ impl<'a> State<'a> {
self.print_outer_attributes(&item.attrs)?;
self.ann.pre(self, NodeItem(item))?;
match item.node {
ast::ItemKind::ExternCrate(ref optional_path) => {
ast::ItemKind::ExternCrate(orig_name) => {
self.head(&visibility_qualified(&item.vis, "extern crate"))?;
if let Some(p) = *optional_path {
let val = p.as_str();
if val.contains('-') {
self.print_string(&val, ast::StrStyle::Cooked)?;
} else {
self.print_name(p)?;
}
if let Some(orig_name) = orig_name {
self.print_name(orig_name)?;
self.s.space()?;
self.s.word("as")?;
self.s.space()?;
@ -1382,7 +1377,7 @@ impl<'a> State<'a> {
self.s.word(";")?;
}
ast::ItemKind::Mac(codemap::Spanned { ref node, .. }) => {
self.print_path(&node.path, false, 0, false)?;
self.print_path(&node.path, false, 0)?;
self.s.word("! ")?;
self.print_ident(item.ident)?;
self.cbox(INDENT_UNIT)?;
@ -1407,7 +1402,7 @@ impl<'a> State<'a> {
}
fn print_trait_ref(&mut self, t: &ast::TraitRef) -> io::Result<()> {
self.print_path(&t.path, false, 0, false)
self.print_path(&t.path, false, 0)
}
fn print_formal_generic_params(
@ -1464,7 +1459,7 @@ impl<'a> State<'a> {
ast::CrateSugar::JustCrate => self.word_nbsp("crate")
}
ast::VisibilityKind::Restricted { ref path, .. } => {
let path = to_string(|s| s.print_path(path, false, 0, true));
let path = to_string(|s| s.print_path(path, false, 0));
if path == "self" || path == "super" {
self.word_nbsp(&format!("pub({})", path))
} else {
@ -1572,7 +1567,7 @@ impl<'a> State<'a> {
ti.ident,
ty,
default.as_ref().map(|expr| &**expr),
&codemap::respan(ti.span.empty(), ast::VisibilityKind::Inherited),
&codemap::respan(ti.span.shrink_to_lo(), ast::VisibilityKind::Inherited),
)?;
}
ast::TraitItemKind::Method(ref sig, ref body) => {
@ -1583,7 +1578,7 @@ impl<'a> State<'a> {
ti.ident,
&ti.generics,
sig,
&codemap::respan(ti.span.empty(), ast::VisibilityKind::Inherited),
&codemap::respan(ti.span.shrink_to_lo(), ast::VisibilityKind::Inherited),
)?;
if let Some(ref body) = *body {
self.nbsp()?;
@ -1598,7 +1593,7 @@ impl<'a> State<'a> {
}
ast::TraitItemKind::Macro(codemap::Spanned { ref node, .. }) => {
// code copied from ItemKind::Mac:
self.print_path(&node.path, false, 0, false)?;
self.print_path(&node.path, false, 0)?;
self.s.word("! ")?;
self.cbox(INDENT_UNIT)?;
self.popen()?;
@ -1632,7 +1627,7 @@ impl<'a> State<'a> {
}
ast::ImplItemKind::Macro(codemap::Spanned { ref node, .. }) => {
// code copied from ItemKind::Mac:
self.print_path(&node.path, false, 0, false)?;
self.print_path(&node.path, false, 0)?;
self.s.word("! ")?;
self.cbox(INDENT_UNIT)?;
self.popen()?;
@ -1818,7 +1813,7 @@ impl<'a> State<'a> {
pub fn print_mac(&mut self, m: &ast::Mac, delim: token::DelimToken)
-> io::Result<()> {
self.print_path(&m.node.path, false, 0, false)?;
self.print_path(&m.node.path, false, 0)?;
self.s.word("!")?;
match delim {
token::Paren => self.popen()?,
@ -1919,7 +1914,7 @@ impl<'a> State<'a> {
fields: &[ast::Field],
wth: &Option<P<ast::Expr>>,
attrs: &[Attribute]) -> io::Result<()> {
self.print_path(path, true, 0, false)?;
self.print_path(path, true, 0)?;
self.s.word("{")?;
self.print_inner_attributes_inline(attrs)?;
self.commasep_cmnt(
@ -2240,7 +2235,7 @@ impl<'a> State<'a> {
}
}
ast::ExprKind::Path(None, ref path) => {
self.print_path(path, true, 0, false)?
self.print_path(path, true, 0)?
}
ast::ExprKind::Path(Some(ref qself), ref path) => {
self.print_qpath(path, qself, true)?
@ -2400,17 +2395,12 @@ impl<'a> State<'a> {
fn print_path(&mut self,
path: &ast::Path,
colons_before_params: bool,
depth: usize,
defaults_to_global: bool)
depth: usize)
-> io::Result<()>
{
self.maybe_print_comment(path.span.lo())?;
let mut segments = path.segments[..path.segments.len()-depth].iter();
if defaults_to_global && path.is_global() {
segments.next();
}
for (i, segment) in segments.enumerate() {
for (i, segment) in path.segments[..path.segments.len() - depth].iter().enumerate() {
if i > 0 {
self.s.word("::")?
}
@ -2449,7 +2439,7 @@ impl<'a> State<'a> {
self.s.space()?;
self.word_space("as")?;
let depth = path.segments.len() - qself.position;
self.print_path(path, false, depth, false)?;
self.print_path(path, false, depth)?;
}
self.s.word(">")?;
self.s.word("::")?;
@ -2552,7 +2542,7 @@ impl<'a> State<'a> {
}
}
PatKind::TupleStruct(ref path, ref elts, ddpos) => {
self.print_path(path, true, 0, false)?;
self.print_path(path, true, 0)?;
self.popen()?;
if let Some(ddpos) = ddpos {
self.commasep(Inconsistent, &elts[..ddpos], |s, p| s.print_pat(p))?;
@ -2570,13 +2560,13 @@ impl<'a> State<'a> {
self.pclose()?;
}
PatKind::Path(None, ref path) => {
self.print_path(path, true, 0, false)?;
self.print_path(path, true, 0)?;
}
PatKind::Path(Some(ref qself), ref path) => {
self.print_qpath(path, qself, false)?;
}
PatKind::Struct(ref path, ref fields, etc) => {
self.print_path(path, true, 0, false)?;
self.print_path(path, true, 0)?;
self.nbsp()?;
self.word_space("{")?;
self.commasep_cmnt(
@ -2953,18 +2943,17 @@ impl<'a> State<'a> {
pub fn print_use_tree(&mut self, tree: &ast::UseTree) -> io::Result<()> {
match tree.kind {
ast::UseTreeKind::Simple(ref ident) => {
self.print_path(&tree.prefix, false, 0, true)?;
if tree.prefix.segments.last().unwrap().identifier.name != ident.name {
ast::UseTreeKind::Simple(rename) => {
self.print_path(&tree.prefix, false, 0)?;
if let Some(rename) = rename {
self.s.space()?;
self.word_space("as")?;
self.print_ident(*ident)?;
self.print_ident(rename)?;
}
}
ast::UseTreeKind::Glob => {
if !tree.prefix.segments.is_empty() {
self.print_path(&tree.prefix, false, 0, true)?;
self.print_path(&tree.prefix, false, 0)?;
self.s.word("::")?;
}
self.s.word("*")?;
@ -2973,7 +2962,7 @@ impl<'a> State<'a> {
if tree.prefix.segments.is_empty() {
self.s.word("{")?;
} else {
self.print_path(&tree.prefix, false, 0, true)?;
self.print_path(&tree.prefix, false, 0)?;
self.s.word("::{")?;
}
self.commasep(Inconsistent, &items[..], |this, &(ref tree, _)| {

10
src/libsyntax/std_inject.rs
View file

@ -43,7 +43,7 @@ thread_local! {
static INJECTED_CRATE_NAME: Cell<Option<&'static str>> = Cell::new(None);
}
pub fn maybe_inject_crates_ref(mut krate: ast::Crate, alt_std_name: Option<String>) -> ast::Crate {
pub fn maybe_inject_crates_ref(mut krate: ast::Crate, alt_std_name: Option<&str>) -> ast::Crate {
let name = if attr::contains_name(&krate.attrs, "no_core") {
return krate;
} else if attr::contains_name(&krate.attrs, "no_std") {
@ -54,14 +54,12 @@ pub fn maybe_inject_crates_ref(mut krate: ast::Crate, alt_std_name: Option<Strin
INJECTED_CRATE_NAME.with(|opt_name| opt_name.set(Some(name)));
let crate_name = Symbol::intern(&alt_std_name.unwrap_or_else(|| name.to_string()));
krate.module.items.insert(0, P(ast::Item {
attrs: vec![attr::mk_attr_outer(DUMMY_SP,
attr::mk_attr_id(),
attr::mk_word_item(Symbol::intern("macro_use")))],
vis: dummy_spanned(ast::VisibilityKind::Inherited),
node: ast::ItemKind::ExternCrate(Some(crate_name)),
node: ast::ItemKind::ExternCrate(alt_std_name.map(Symbol::intern)),
ident: ast::Ident::from_str(name),
id: ast::DUMMY_NODE_ID,
span: DUMMY_SP,
@ -78,10 +76,10 @@ pub fn maybe_inject_crates_ref(mut krate: ast::Crate, alt_std_name: Option<Strin
is_sugared_doc: false,
span,
}],
vis: respan(span.empty(), ast::VisibilityKind::Inherited),
vis: respan(span.shrink_to_lo(), ast::VisibilityKind::Inherited),
node: ast::ItemKind::Use(P(ast::UseTree {
prefix: ast::Path {
segments: ["{{root}}", name, "prelude", "v1"].into_iter().map(|name| {
segments: [name, "prelude", "v1"].into_iter().map(|name| {
ast::PathSegment::from_ident(ast::Ident::from_str(name), DUMMY_SP)
}).collect(),
span,

13
src/libsyntax/test.rs
View file

@ -78,7 +78,7 @@ pub fn modify_for_testing(sess: &ParseSess,
span_diagnostic: &errors::Handler,
features: &Features) -> ast::Crate {
// Check for #[reexport_test_harness_main = "some_name"] which
// creates a `use some_name = __test::main;`. This needs to be
// creates a `use __test::main as some_name;`. This needs to be
// unconditional, so that the attribute is still marked as used in
// non-test builds.
let reexport_test_harness_main =
@ -240,7 +240,8 @@ fn mk_reexport_mod(cx: &mut TestCtxt,
cx.ext_cx.path(DUMMY_SP, vec![super_, r]))
}).chain(tested_submods.into_iter().map(|(r, sym)| {
let path = cx.ext_cx.path(DUMMY_SP, vec![super_, r, sym]);
cx.ext_cx.item_use_simple_(DUMMY_SP, dummy_spanned(ast::VisibilityKind::Public), r, path)
cx.ext_cx.item_use_simple_(DUMMY_SP, dummy_spanned(ast::VisibilityKind::Public),
Some(r), path)
})).collect();
let reexport_mod = ast::Mod {
@ -502,7 +503,7 @@ fn mk_std(cx: &TestCtxt) -> P<ast::Item> {
(ast::ItemKind::Use(P(ast::UseTree {
span: DUMMY_SP,
prefix: path_node(vec![id_test]),
kind: ast::UseTreeKind::Simple(id_test),
kind: ast::UseTreeKind::Simple(None),
})),
ast::VisibilityKind::Public, keywords::Invalid.ident())
} else {
@ -590,13 +591,13 @@ fn mk_test_module(cx: &mut TestCtxt) -> (P<ast::Item>, Option<P<ast::Item>>) {
tokens: None,
})).pop().unwrap();
let reexport = cx.reexport_test_harness_main.map(|s| {
// building `use <ident> = __test::main`
let reexport_ident = Ident::with_empty_ctxt(s);
// building `use __test::main as <ident>;`
let rename = Ident::with_empty_ctxt(s);
let use_path = ast::UseTree {
span: DUMMY_SP,
prefix: path_node(vec![mod_ident, Ident::from_str("main")]),
kind: ast::UseTreeKind::Simple(reexport_ident),
kind: ast::UseTreeKind::Simple(Some(rename)),
};
expander.fold_item(P(ast::Item {

13
src/libsyntax/visit.rs
View file

@ -213,9 +213,9 @@ pub fn walk_item<'a, V: Visitor<'a>>(visitor: &mut V, item: &'a Item) {
visitor.visit_vis(&item.vis);
visitor.visit_ident(item.span, item.ident);
match item.node {
ItemKind::ExternCrate(opt_name) => {
if let Some(name) = opt_name {
visitor.visit_name(item.span, name);
ItemKind::ExternCrate(orig_name) => {
if let Some(orig_name) = orig_name {
visitor.visit_name(item.span, orig_name);
}
}
ItemKind::Use(ref use_tree) => {
@ -354,10 +354,11 @@ pub fn walk_use_tree<'a, V: Visitor<'a>>(
visitor: &mut V, use_tree: &'a UseTree, id: NodeId,
) {
visitor.visit_path(&use_tree.prefix, id);
match use_tree.kind {
UseTreeKind::Simple(ident) => {
visitor.visit_ident(use_tree.span, ident);
UseTreeKind::Simple(rename) => {
if let Some(rename) = rename {
visitor.visit_ident(use_tree.span, rename);
}
}
UseTreeKind::Glob => {},
UseTreeKind::Nested(ref use_trees) => {

4
src/libsyntax_ext/deriving/generic/mod.rs
View file

@ -530,7 +530,7 @@ impl<'a> TraitDef<'a> {
id: ast::DUMMY_NODE_ID,
span: self.span,
ident,
vis: respan(self.span.empty(), ast::VisibilityKind::Inherited),
vis: respan(self.span.shrink_to_lo(), ast::VisibilityKind::Inherited),
defaultness: ast::Defaultness::Final,
attrs: Vec::new(),
generics: Generics::default(),
@ -977,7 +977,7 @@ impl<'a> MethodDef<'a> {
attrs: self.attributes.clone(),
generics: fn_generics,
span: trait_.span,
vis: respan(trait_.span.empty(), ast::VisibilityKind::Inherited),
vis: respan(trait_.span.shrink_to_lo(), ast::VisibilityKind::Inherited),
defaultness: ast::Defaultness::Final,
ident: method_ident,
node: ast::ImplItemKind::Method(ast::MethodSig {

2
src/libsyntax_ext/global_asm.rs
View file

@ -60,7 +60,7 @@ pub fn expand_global_asm<'cx>(cx: &'cx mut ExtCtxt,
asm,
ctxt: cx.backtrace(),
})),
vis: respan(sp.empty(), ast::VisibilityKind::Inherited),
vis: respan(sp.shrink_to_lo(), ast::VisibilityKind::Inherited),
span: sp,
tokens: None,
})))

11
src/libsyntax_pos/lib.rs
View file

@ -239,8 +239,15 @@ impl Span {
/// Returns a new span representing an empty span at the beginning of this span
#[inline]
pub fn empty(self) -> Span {
self.with_hi(self.lo())
pub fn shrink_to_lo(self) -> Span {
let span = self.data();
span.with_hi(span.lo)
}
/// Returns a new span representing an empty span at the end of this span
#[inline]
pub fn shrink_to_hi(self) -> Span {
let span = self.data();
span.with_lo(span.hi)
}
/// Returns `self` if `self` is not the dummy span, and `other` otherwise.

4
src/test/compile-fail/lint-unnecessary-import-braces.rs
View file

@ -9,12 +9,12 @@
// except according to those terms.
#![deny(unused_import_braces)]
#![allow(dead_code)]
#![allow(unused_imports)]
use test::{A}; //~ ERROR braces around A is unnecessary
mod test {
use test::{self}; // OK
use test::{self as rename}; // OK
pub struct A;
}