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feat: Downmap tokens inside derive helpers

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This commit is contained in:
Lukas Wirth 2022-07-24 12:04:15 +02:00
parent 7ba94a89e9
commit 4e60db2d07
9 changed files with 151 additions and 75 deletions
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132
crates/hir/src/semantics.rs
View file

@ -733,6 +733,8 @@ impl<'db> SemanticsImpl<'db> {
Some(it) => it,
None => return,
};
let def_map = sa.resolver.def_map();
let mut stack: SmallVec<[_; 4]> = smallvec![InFile::new(sa.file_id, token)];
let mut cache = self.expansion_info_cache.borrow_mut();
let mut mcache = self.macro_call_cache.borrow_mut();
@ -764,7 +766,7 @@ impl<'db> SemanticsImpl<'db> {
while let Some(token) = stack.pop() {
self.db.unwind_if_cancelled();
let was_not_remapped = (|| {
// are we inside an attribute macro call
// First expand into attribute invocations
let containing_attribute_macro_call = self.with_ctx(|ctx| {
token.value.parent_ancestors().filter_map(ast::Item::cast).find_map(|item| {
if item.attrs().next().is_none() {
@ -784,53 +786,19 @@ impl<'db> SemanticsImpl<'db> {
);
}
// or are we inside a function-like macro call
if let Some(tt) =
// FIXME replace map.while_some with take_while once stable
token
.value
.parent_ancestors()
.map(ast::TokenTree::cast)
.while_some()
.last()
{
let parent = tt.syntax().parent()?;
// check for derive attribute here
let macro_call = match_ast! {
match parent {
ast::MacroCall(mcall) => mcall,
// attribute we failed expansion for earlier, this might be a derive invocation
// so try downmapping the token into the pseudo derive expansion
// see [hir_expand::builtin_attr_macro] for how the pseudo derive expansion works
ast::Meta(meta) => {
let attr = meta.parent_attr()?;
let adt = attr.syntax().parent().and_then(ast::Adt::cast)?;
let call_id = self.with_ctx(|ctx| {
let (_, call_id, _) = ctx.attr_to_derive_macro_call(
token.with_value(&adt),
token.with_value(attr),
)?;
Some(call_id)
})?;
let file_id = call_id.as_file();
return process_expansion_for_token(
&mut stack,
file_id,
Some(adt.into()),
token.as_ref(),
);
},
_ => return None,
}
};
// Then check for token trees, that means we are either in a function-like macro or
// secondary attribute inputs
let tt = token.value.parent_ancestors().map_while(ast::TokenTree::cast).last()?;
let parent = tt.syntax().parent()?;
if tt.left_delimiter_token().map_or(false, |it| it == token.value) {
return None;
}
if tt.right_delimiter_token().map_or(false, |it| it == token.value) {
return None;
}
if tt.left_delimiter_token().map_or(false, |it| it == token.value) {
return None;
}
if tt.right_delimiter_token().map_or(false, |it| it == token.value) {
return None;
}
if let Some(macro_call) = ast::MacroCall::cast(parent.clone()) {
let mcall = token.with_value(macro_call);
let file_id = match mcache.get(&mcall) {
Some(&it) => it,
@ -840,11 +808,75 @@ impl<'db> SemanticsImpl<'db> {
it
}
};
return process_expansion_for_token(&mut stack, file_id, None, token.as_ref());
}
process_expansion_for_token(&mut stack, file_id, None, token.as_ref())
} else if let Some(meta) = ast::Meta::cast(parent.clone()) {
// attribute we failed expansion for earlier, this might be a derive invocation
// or derive helper attribute
let attr = meta.parent_attr()?;
// outside of a macro invocation so this is a "final" token
None
let adt = if let Some(adt) = attr.syntax().parent().and_then(ast::Adt::cast) {
// this might be a derive, or a derive helper on an ADT
let derive_call = self.with_ctx(|ctx| {
// so try downmapping the token into the pseudo derive expansion
// see [hir_expand::builtin_attr_macro] for how the pseudo derive expansion works
ctx.attr_to_derive_macro_call(
token.with_value(&adt),
token.with_value(attr.clone()),
)
.map(|(_, call_id, _)| call_id)
});
match derive_call {
Some(call_id) => {
// resolved to a derive
let file_id = call_id.as_file();
return process_expansion_for_token(
&mut stack,
file_id,
Some(adt.into()),
token.as_ref(),
);
}
None => Some(adt),
}
} else {
// Otherwise this could be a derive helper on a variant or field
if let Some(field) = attr.syntax().parent().and_then(ast::RecordField::cast)
{
field.syntax().ancestors().take(4).find_map(ast::Adt::cast)
} else if let Some(field) =
attr.syntax().parent().and_then(ast::TupleField::cast)
{
field.syntax().ancestors().take(4).find_map(ast::Adt::cast)
} else if let Some(variant) =
attr.syntax().parent().and_then(ast::Variant::cast)
{
variant.syntax().ancestors().nth(2).and_then(ast::Adt::cast)
} else {
None
}
}?;
// Not an attribute, nor a derive, so it's either a builtin or a derive helper
// Try to resolve to a derive helper and downmap
let attr_name = attr.path().and_then(|it| it.as_single_name_ref())?.as_name();
let id = self.db.ast_id_map(token.file_id).ast_id(&adt);
let helpers =
def_map.derive_helpers_in_scope(InFile::new(token.file_id, id))?;
let item = Some(adt.into());
let mut res = None;
for (_, derive) in helpers.iter().filter(|(helper, _)| *helper == attr_name) {
res = res.or(process_expansion_for_token(
&mut stack,
derive.as_file(),
item.clone(),
token.as_ref(),
));
}
res
} else {
None
}
})()
.is_none();

2
crates/hir/src/semantics/source_to_def.rs
View file

@ -247,6 +247,7 @@ impl SourceToDefCtx<'_, '_> {
map[keys::ATTR_MACRO_CALL].get(&src.value).copied()
}
/// (AttrId, derive attribute call id, derive call ids)
pub(super) fn attr_to_derive_macro_call(
&mut self,
item: InFile<&ast::Adt>,
@ -257,6 +258,7 @@ impl SourceToDefCtx<'_, '_> {
.get(&src.value)
.map(|&(attr_id, call_id, ref ids)| (attr_id, call_id, &**ids))
}
pub(super) fn has_derives(&mut self, adt: InFile<&ast::Adt>) -> bool {
self.dyn_map(adt).as_ref().map_or(false, |map| !map[keys::DERIVE_MACRO_CALL].is_empty())
}