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Speculatively expand attributes in completions

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This commit is contained in:
Lukas Wirth 2021-09-02 18:54:09 +02:00
parent c3eb646487
commit 2b907652ee
7 changed files with 238 additions and 66 deletions
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112
crates/ide_completion/src/context.rs
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@ -175,48 +175,90 @@ impl<'a> CompletionContext<'a> {
incomplete_let: false,
no_completion_required: false,
};
let mut original_file = original_file.syntax().clone();
let mut speculative_file = file_with_fake_ident.syntax().clone();
let mut offset = position.offset;
let mut fake_ident_token = fake_ident_token;
// Are we inside a macro call?
while let (Some(actual_macro_call), Some(macro_call_with_fake_ident)) = (
find_node_at_offset::<ast::MacroCall>(&original_file, offset),
find_node_at_offset::<ast::MacroCall>(&speculative_file, offset),
) {
if actual_macro_call.path().as_ref().map(|s| s.syntax().text())
!= macro_call_with_fake_ident.path().as_ref().map(|s| s.syntax().text())
{
break;
}
let speculative_args = match macro_call_with_fake_ident.token_tree() {
Some(tt) => tt,
None => break,
};
if let (Some(actual_expansion), Some(speculative_expansion)) = (
ctx.sema.expand(&actual_macro_call),
ctx.sema.speculative_expand(
&actual_macro_call,
&speculative_args,
fake_ident_token,
),
ctx.expand_and_fill(
original_file.syntax().clone(),
file_with_fake_ident.syntax().clone(),
position.offset,
fake_ident_token,
);
Some(ctx)
}
fn expand_and_fill(
&mut self,
mut original_file: SyntaxNode,
mut speculative_file: SyntaxNode,
mut offset: TextSize,
mut fake_ident_token: SyntaxToken,
) {
loop {
if let (Some(actual_item), Some(item_with_fake_ident)) = (
find_node_at_offset::<ast::Item>(&original_file, offset),
find_node_at_offset::<ast::Item>(&speculative_file, offset),
) {
let new_offset = speculative_expansion.1.text_range().start();
if new_offset > actual_expansion.text_range().end() {
match (
self.sema.expand_attr_macro(&actual_item),
self.sema.speculative_expand_attr_macro(
&actual_item,
&item_with_fake_ident,
fake_ident_token.clone(),
),
) {
(Some(actual_expansion), Some(speculative_expansion)) => {
let new_offset = speculative_expansion.1.text_range().start();
if new_offset > actual_expansion.text_range().end() {
break;
}
original_file = actual_expansion;
speculative_file = speculative_expansion.0;
fake_ident_token = speculative_expansion.1;
offset = new_offset;
continue;
}
(None, None) => (),
_ => break,
}
}
if let (Some(actual_macro_call), Some(macro_call_with_fake_ident)) = (
find_node_at_offset::<ast::MacroCall>(&original_file, offset),
find_node_at_offset::<ast::MacroCall>(&speculative_file, offset),
) {
let mac_call_path0 = actual_macro_call.path().as_ref().map(|s| s.syntax().text());
let mac_call_path1 =
macro_call_with_fake_ident.path().as_ref().map(|s| s.syntax().text());
if mac_call_path0 != mac_call_path1 {
break;
}
let speculative_args = match macro_call_with_fake_ident.token_tree() {
Some(tt) => tt,
None => break,
};
if let (Some(actual_expansion), Some(speculative_expansion)) = (
self.sema.expand(&actual_macro_call),
self.sema.speculative_expand(
&actual_macro_call,
&speculative_args,
fake_ident_token,
),
) {
let new_offset = speculative_expansion.1.text_range().start();
if new_offset > actual_expansion.text_range().end() {
break;
}
original_file = actual_expansion;
speculative_file = speculative_expansion.0;
fake_ident_token = speculative_expansion.1;
offset = new_offset;
} else {
break;
}
original_file = actual_expansion;
speculative_file = speculative_expansion.0;
fake_ident_token = speculative_expansion.1;
offset = new_offset;
} else {
break;
}
}
ctx.fill(&original_file, speculative_file, offset);
Some(ctx)
self.fill(&original_file, speculative_file, offset);
}
/// Checks whether completions in that particular case don't make much sense.