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feat: Enable completions within derive helper attributes

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This commit is contained in:
Lukas Wirth 2024-06-02 09:28:34 +02:00
parent c0171bdd32
commit 3116f76fba
2 changed files with 209 additions and 98 deletions
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86
crates/ide-completion/src/context/analysis.rs
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@ -3,8 +3,9 @@ use std::iter;
use hir::{Semantics, Type, TypeInfo, Variant};
use ide_db::{active_parameter::ActiveParameter, RootDatabase};
use itertools::Either;
use syntax::{
algo::{find_node_at_offset, non_trivia_sibling},
algo::{ancestors_at_offset, find_node_at_offset, non_trivia_sibling},
ast::{self, AttrKind, HasArgList, HasGenericParams, HasLoopBody, HasName, NameOrNameRef},
match_ast, AstNode, AstToken, Direction, NodeOrToken, SyntaxElement, SyntaxKind, SyntaxNode,
SyntaxToken, TextRange, TextSize, T,
@ -119,20 +120,45 @@ fn expand(
}
// No attributes have been expanded, so look for macro_call! token trees or derive token trees
let orig_tt = match find_node_at_offset::<ast::TokenTree>(&original_file, offset) {
let orig_tt = match ancestors_at_offset(&original_file, offset)
.map_while(Either::<ast::TokenTree, ast::Meta>::cast)
.last()
{
Some(it) => it,
None => break 'expansion,
};
let spec_tt = match find_node_at_offset::<ast::TokenTree>(&speculative_file, offset) {
let spec_tt = match ancestors_at_offset(&speculative_file, offset)
.map_while(Either::<ast::TokenTree, ast::Meta>::cast)
.last()
{
Some(it) => it,
None => break 'expansion,
};
// Expand pseudo-derive expansion
if let (Some(orig_attr), Some(spec_attr)) = (
orig_tt.syntax().parent().and_then(ast::Meta::cast).and_then(|it| it.parent_attr()),
spec_tt.syntax().parent().and_then(ast::Meta::cast).and_then(|it| it.parent_attr()),
) {
let (tts, attrs) = match (orig_tt, spec_tt) {
(Either::Left(orig_tt), Either::Left(spec_tt)) => {
let attrs = orig_tt
.syntax()
.parent()
.and_then(ast::Meta::cast)
.and_then(|it| it.parent_attr())
.zip(
spec_tt
.syntax()
.parent()
.and_then(ast::Meta::cast)
.and_then(|it| it.parent_attr()),
);
(Some((orig_tt, spec_tt)), attrs)
}
(Either::Right(orig_path), Either::Right(spec_path)) => {
(None, orig_path.parent_attr().zip(spec_path.parent_attr()))
}
_ => break 'expansion,
};
// Expand pseudo-derive expansion aka `derive(Debug$0)`
if let Some((orig_attr, spec_attr)) = attrs {
if let (Some(actual_expansion), Some((fake_expansion, fake_mapped_token))) = (
sema.expand_derive_as_pseudo_attr_macro(&orig_attr),
sema.speculative_expand_derive_as_pseudo_attr_macro(
@ -147,15 +173,54 @@ fn expand(
fake_mapped_token.text_range().start(),
orig_attr,
));
break 'expansion;
}
if let Some(spec_adt) =
spec_attr.syntax().ancestors().find_map(ast::Item::cast).and_then(|it| match it {
ast::Item::Struct(it) => Some(ast::Adt::Struct(it)),
ast::Item::Enum(it) => Some(ast::Adt::Enum(it)),
ast::Item::Union(it) => Some(ast::Adt::Union(it)),
_ => None,
})
{
// might be the path of derive helper or a token tree inside of one
if let Some(helpers) = sema.derive_helper(&orig_attr) {
for (_mac, file) in helpers {
if let Some((fake_expansion, fake_mapped_token)) = sema
.speculative_expand_raw(
file,
spec_adt.syntax(),
fake_ident_token.clone(),
)
{
// we are inside a derive helper token tree, treat this as being inside
// the derive expansion
let actual_expansion = sema.parse_or_expand(file.into());
let new_offset = fake_mapped_token.text_range().start();
if new_offset + relative_offset > actual_expansion.text_range().end() {
// offset outside of bounds from the original expansion,
// stop here to prevent problems from happening
break 'expansion;
}
original_file = actual_expansion;
speculative_file = fake_expansion;
fake_ident_token = fake_mapped_token;
offset = new_offset;
continue 'expansion;
}
}
}
}
// at this point we won't have any more successful expansions, so stop
break 'expansion;
}
// Expand fn-like macro calls
let Some((orig_tt, spec_tt)) = tts else { break 'expansion };
if let (Some(actual_macro_call), Some(macro_call_with_fake_ident)) = (
orig_tt.syntax().ancestors().find_map(ast::MacroCall::cast),
spec_tt.syntax().ancestors().find_map(ast::MacroCall::cast),
orig_tt.syntax().parent().and_then(ast::MacroCall::cast),
spec_tt.syntax().parent().and_then(ast::MacroCall::cast),
) {
let mac_call_path0 = actual_macro_call.path().as_ref().map(|s| s.syntax().text());
let mac_call_path1 =
@ -201,6 +266,7 @@ fn expand(
// none of our states have changed so stop the loop
break 'expansion;
}
ExpansionResult { original_file, speculative_file, offset, fake_ident_token, derive_ctx }
}