aboutsummaryrefslogtreecommitdiff
path: root/crates/completion/src/completions/attribute.rs
blob: 8695eed3984096068b1be09b6bd0e44df1360df0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
//! Completion for attributes
//!
//! This module uses a bit of static metadata to provide completions
//! for built-in attributes.

use itertools::Itertools;
use rustc_hash::FxHashSet;
use syntax::{ast, AstNode, SyntaxKind};

use crate::{
    context::CompletionContext,
    generated_lint_completions::{CLIPPY_LINTS, FEATURES},
    item::{CompletionItem, CompletionItemKind, CompletionKind},
    Completions,
};

pub(crate) fn complete_attribute(acc: &mut Completions, ctx: &CompletionContext) -> Option<()> {
    if ctx.mod_declaration_under_caret.is_some() {
        return None;
    }

    let attribute = ctx.attribute_under_caret.as_ref()?;
    match (attribute.path(), attribute.token_tree()) {
        (Some(path), Some(token_tree)) if path.to_string() == "derive" => {
            complete_derive(acc, ctx, token_tree)
        }
        (Some(path), Some(token_tree)) if path.to_string() == "feature" => {
            complete_lint(acc, ctx, token_tree, FEATURES);
        }
        (Some(path), Some(token_tree))
            if ["allow", "warn", "deny", "forbid"]
                .iter()
                .any(|lint_level| lint_level == &path.to_string()) =>
        {
            complete_lint(acc, ctx, token_tree.clone(), DEFAULT_LINT_COMPLETIONS);
            complete_lint(acc, ctx, token_tree, CLIPPY_LINTS);
        }
        (_, Some(_token_tree)) => {}
        _ => complete_attribute_start(acc, ctx, attribute),
    }
    Some(())
}

fn complete_attribute_start(acc: &mut Completions, ctx: &CompletionContext, attribute: &ast::Attr) {
    for attr_completion in ATTRIBUTES {
        let mut item = CompletionItem::new(
            CompletionKind::Attribute,
            ctx.source_range(),
            attr_completion.label,
        )
        .kind(CompletionItemKind::Attribute);

        if let Some(lookup) = attr_completion.lookup {
            item = item.lookup_by(lookup);
        }

        match (attr_completion.snippet, ctx.config.snippet_cap) {
            (Some(snippet), Some(cap)) => {
                item = item.insert_snippet(cap, snippet);
            }
            _ => {}
        }

        if attribute.kind() == ast::AttrKind::Inner || !attr_completion.prefer_inner {
            acc.add(item.build());
        }
    }
}

struct AttrCompletion {
    label: &'static str,
    lookup: Option<&'static str>,
    snippet: Option<&'static str>,
    prefer_inner: bool,
}

impl AttrCompletion {
    const fn prefer_inner(self) -> AttrCompletion {
        AttrCompletion { prefer_inner: true, ..self }
    }
}

const fn attr(
    label: &'static str,
    lookup: Option<&'static str>,
    snippet: Option<&'static str>,
) -> AttrCompletion {
    AttrCompletion { label, lookup, snippet, prefer_inner: false }
}

/// https://doc.rust-lang.org/reference/attributes.html#built-in-attributes-index
const ATTRIBUTES: &[AttrCompletion] = &[
    attr("allow(…)", Some("allow"), Some("allow(${0:lint})")),
    attr("automatically_derived", None, None),
    attr("cfg_attr(…)", Some("cfg_attr"), Some("cfg_attr(${1:predicate}, ${0:attr})")),
    attr("cfg(…)", Some("cfg"), Some("cfg(${0:predicate})")),
    attr("cold", None, None),
    attr(r#"crate_name = """#, Some("crate_name"), Some(r#"crate_name = "${0:crate_name}""#))
        .prefer_inner(),
    attr("deny(…)", Some("deny"), Some("deny(${0:lint})")),
    attr(r#"deprecated = "…""#, Some("deprecated"), Some(r#"deprecated = "${0:reason}""#)),
    attr("derive(…)", Some("derive"), Some(r#"derive(${0:Debug})"#)),
    attr(
        r#"export_name = "…""#,
        Some("export_name"),
        Some(r#"export_name = "${0:exported_symbol_name}""#),
    ),
    attr(r#"doc = "…""#, Some("doc"), Some(r#"doc = "${0:docs}""#)),
    attr("feature(…)", Some("feature"), Some("feature(${0:flag})")).prefer_inner(),
    attr("forbid(…)", Some("forbid"), Some("forbid(${0:lint})")),
    // FIXME: resolve through macro resolution?
    attr("global_allocator", None, None).prefer_inner(),
    attr(r#"ignore = "…""#, Some("ignore"), Some(r#"ignore = "${0:reason}""#)),
    attr("inline(…)", Some("inline"), Some("inline(${0:lint})")),
    attr("link", None, None),
    attr(r#"link_name = "…""#, Some("link_name"), Some(r#"link_name = "${0:symbol_name}""#)),
    attr(
        r#"link_section = "…""#,
        Some("link_section"),
        Some(r#"link_section = "${0:section_name}""#),
    ),
    attr("macro_export", None, None),
    attr("macro_use", None, None),
    attr(r#"must_use = "…""#, Some("must_use"), Some(r#"must_use = "${0:reason}""#)),
    attr("no_link", None, None).prefer_inner(),
    attr("no_implicit_prelude", None, None).prefer_inner(),
    attr("no_main", None, None).prefer_inner(),
    attr("no_mangle", None, None),
    attr("no_std", None, None).prefer_inner(),
    attr("non_exhaustive", None, None),
    attr("panic_handler", None, None).prefer_inner(),
    attr(r#"path = "…""#, Some("path"), Some(r#"path ="${0:path}""#)),
    attr("proc_macro", None, None),
    attr("proc_macro_attribute", None, None),
    attr("proc_macro_derive(…)", Some("proc_macro_derive"), Some("proc_macro_derive(${0:Trait})")),
    attr("recursion_limit = …", Some("recursion_limit"), Some("recursion_limit = ${0:128}"))
        .prefer_inner(),
    attr("repr(…)", Some("repr"), Some("repr(${0:C})")),
    attr(
        "should_panic(…)",
        Some("should_panic"),
        Some(r#"should_panic(expected = "${0:reason}")"#),
    ),
    attr(
        r#"target_feature = "…""#,
        Some("target_feature"),
        Some(r#"target_feature = "${0:feature}""#),
    ),
    attr("test", None, None),
    attr("track_caller", None, None),
    attr("type_length_limit = …", Some("type_length_limit"), Some("type_length_limit = ${0:128}"))
        .prefer_inner(),
    attr("used", None, None),
    attr("warn(…)", Some("warn"), Some("warn(${0:lint})")),
    attr(
        r#"windows_subsystem = "…""#,
        Some("windows_subsystem"),
        Some(r#"windows_subsystem = "${0:subsystem}""#),
    )
    .prefer_inner(),
];

fn complete_derive(acc: &mut Completions, ctx: &CompletionContext, derive_input: ast::TokenTree) {
    if let Ok(existing_derives) = parse_comma_sep_input(derive_input) {
        for derive_completion in DEFAULT_DERIVE_COMPLETIONS
            .iter()
            .filter(|completion| !existing_derives.contains(completion.label))
        {
            let mut components = vec![derive_completion.label];
            components.extend(
                derive_completion
                    .dependencies
                    .iter()
                    .filter(|&&dependency| !existing_derives.contains(dependency)),
            );
            let lookup = components.join(", ");
            let label = components.iter().rev().join(", ");
            CompletionItem::new(CompletionKind::Attribute, ctx.source_range(), label)
                .lookup_by(lookup)
                .kind(CompletionItemKind::Attribute)
                .add_to(acc)
        }

        for custom_derive_name in get_derive_names_in_scope(ctx).difference(&existing_derives) {
            CompletionItem::new(CompletionKind::Attribute, ctx.source_range(), custom_derive_name)
                .kind(CompletionItemKind::Attribute)
                .add_to(acc)
        }
    }
}

fn complete_lint(
    acc: &mut Completions,
    ctx: &CompletionContext,
    derive_input: ast::TokenTree,
    lints_completions: &[LintCompletion],
) {
    if let Ok(existing_lints) = parse_comma_sep_input(derive_input) {
        for lint_completion in lints_completions
            .into_iter()
            .filter(|completion| !existing_lints.contains(completion.label))
        {
            CompletionItem::new(
                CompletionKind::Attribute,
                ctx.source_range(),
                lint_completion.label,
            )
            .kind(CompletionItemKind::Attribute)
            .detail(lint_completion.description)
            .add_to(acc)
        }
    }
}

fn parse_comma_sep_input(derive_input: ast::TokenTree) -> Result<FxHashSet<String>, ()> {
    match (derive_input.left_delimiter_token(), derive_input.right_delimiter_token()) {
        (Some(left_paren), Some(right_paren))
            if left_paren.kind() == SyntaxKind::L_PAREN
                && right_paren.kind() == SyntaxKind::R_PAREN =>
        {
            let mut input_derives = FxHashSet::default();
            let mut current_derive = String::new();
            for token in derive_input
                .syntax()
                .children_with_tokens()
                .filter_map(|token| token.into_token())
                .skip_while(|token| token != &left_paren)
                .skip(1)
                .take_while(|token| token != &right_paren)
            {
                if SyntaxKind::COMMA == token.kind() {
                    if !current_derive.is_empty() {
                        input_derives.insert(current_derive);
                        current_derive = String::new();
                    }
                } else {
                    current_derive.push_str(token.text().trim());
                }
            }

            if !current_derive.is_empty() {
                input_derives.insert(current_derive);
            }
            Ok(input_derives)
        }
        _ => Err(()),
    }
}

fn get_derive_names_in_scope(ctx: &CompletionContext) -> FxHashSet<String> {
    let mut result = FxHashSet::default();
    ctx.scope.process_all_names(&mut |name, scope_def| {
        if let hir::ScopeDef::MacroDef(mac) = scope_def {
            if mac.is_derive_macro() {
                result.insert(name.to_string());
            }
        }
    });
    result
}

struct DeriveCompletion {
    label: &'static str,
    dependencies: &'static [&'static str],
}

/// Standard Rust derives and the information about their dependencies
/// (the dependencies are needed so that the main derive don't break the compilation when added)
const DEFAULT_DERIVE_COMPLETIONS: &[DeriveCompletion] = &[
    DeriveCompletion { label: "Clone", dependencies: &[] },
    DeriveCompletion { label: "Copy", dependencies: &["Clone"] },
    DeriveCompletion { label: "Debug", dependencies: &[] },
    DeriveCompletion { label: "Default", dependencies: &[] },
    DeriveCompletion { label: "Hash", dependencies: &[] },
    DeriveCompletion { label: "PartialEq", dependencies: &[] },
    DeriveCompletion { label: "Eq", dependencies: &["PartialEq"] },
    DeriveCompletion { label: "PartialOrd", dependencies: &["PartialEq"] },
    DeriveCompletion { label: "Ord", dependencies: &["PartialOrd", "Eq", "PartialEq"] },
];

pub(crate) struct LintCompletion {
    pub(crate) label: &'static str,
    pub(crate) description: &'static str,
}

#[rustfmt::skip]
const DEFAULT_LINT_COMPLETIONS: &[LintCompletion] = &[
    LintCompletion { label: "absolute_paths_not_starting_with_crate", description: r#"fully qualified paths that start with a module name instead of `crate`, `self`, or an extern crate name"# },
    LintCompletion { label: "anonymous_parameters", description: r#"detects anonymous parameters"# },
    LintCompletion { label: "box_pointers", description: r#"use of owned (Box type) heap memory"# },
    LintCompletion { label: "deprecated_in_future", description: r#"detects use of items that will be deprecated in a future version"# },
    LintCompletion { label: "elided_lifetimes_in_paths", description: r#"hidden lifetime parameters in types are deprecated"# },
    LintCompletion { label: "explicit_outlives_requirements", description: r#"outlives requirements can be inferred"# },
    LintCompletion { label: "indirect_structural_match", description: r#"pattern with const indirectly referencing non-structural-match type"# },
    LintCompletion { label: "keyword_idents", description: r#"detects edition keywords being used as an identifier"# },
    LintCompletion { label: "macro_use_extern_crate", description: r#"the `#[macro_use]` attribute is now deprecated in favor of using macros via the module system"# },
    LintCompletion { label: "meta_variable_misuse", description: r#"possible meta-variable misuse at macro definition"# },
    LintCompletion { label: "missing_copy_implementations", description: r#"detects potentially-forgotten implementations of `Copy`"# },
    LintCompletion { label: "missing_crate_level_docs", description: r#"detects crates with no crate-level documentation"# },
    LintCompletion { label: "missing_debug_implementations", description: r#"detects missing implementations of Debug"# },
    LintCompletion { label: "missing_docs", description: r#"detects missing documentation for public members"# },
    LintCompletion { label: "missing_doc_code_examples", description: r#"detects publicly-exported items without code samples in their documentation"# },
    LintCompletion { label: "non_ascii_idents", description: r#"detects non-ASCII identifiers"# },
    LintCompletion { label: "private_doc_tests", description: r#"detects code samples in docs of private items not documented by rustdoc"# },
    LintCompletion { label: "single_use_lifetimes", description: r#"detects lifetime parameters that are only used once"# },
    LintCompletion { label: "trivial_casts", description: r#"detects trivial casts which could be removed"# },
    LintCompletion { label: "trivial_numeric_casts", description: r#"detects trivial casts of numeric types which could be removed"# },
    LintCompletion { label: "unaligned_references", description: r#"detects unaligned references to fields of packed structs"# },
    LintCompletion { label: "unreachable_pub", description: r#"`pub` items not reachable from crate root"# },
    LintCompletion { label: "unsafe_code", description: r#"usage of `unsafe` code"# },
    LintCompletion { label: "unsafe_op_in_unsafe_fn", description: r#"unsafe operations in unsafe functions without an explicit unsafe block are deprecated"# },
    LintCompletion { label: "unstable_features", description: r#"enabling unstable features (deprecated. do not use)"# },
    LintCompletion { label: "unused_crate_dependencies", description: r#"crate dependencies that are never used"# },
    LintCompletion { label: "unused_extern_crates", description: r#"extern crates that are never used"# },
    LintCompletion { label: "unused_import_braces", description: r#"unnecessary braces around an imported item"# },
    LintCompletion { label: "unused_lifetimes", description: r#"detects lifetime parameters that are never used"# },
    LintCompletion { label: "unused_qualifications", description: r#"detects unnecessarily qualified names"# },
    LintCompletion { label: "unused_results", description: r#"unused result of an expression in a statement"# },
    LintCompletion { label: "variant_size_differences", description: r#"detects enums with widely varying variant sizes"# },
    LintCompletion { label: "array_into_iter", description: r#"detects calling `into_iter` on arrays"# },
    LintCompletion { label: "asm_sub_register", description: r#"using only a subset of a register for inline asm inputs"# },
    LintCompletion { label: "bare_trait_objects", description: r#"suggest using `dyn Trait` for trait objects"# },
    LintCompletion { label: "bindings_with_variant_name", description: r#"detects pattern bindings with the same name as one of the matched variants"# },
    LintCompletion { label: "cenum_impl_drop_cast", description: r#"a C-like enum implementing Drop is cast"# },
    LintCompletion { label: "clashing_extern_declarations", description: r#"detects when an extern fn has been declared with the same name but different types"# },
    LintCompletion { label: "coherence_leak_check", description: r#"distinct impls distinguished only by the leak-check code"# },
    LintCompletion { label: "confusable_idents", description: r#"detects visually confusable pairs between identifiers"# },
    LintCompletion { label: "dead_code", description: r#"detect unused, unexported items"# },
    LintCompletion { label: "deprecated", description: r#"detects use of deprecated items"# },
    LintCompletion { label: "ellipsis_inclusive_range_patterns", description: r#"`...` range patterns are deprecated"# },
    LintCompletion { label: "exported_private_dependencies", description: r#"public interface leaks type from a private dependency"# },
    LintCompletion { label: "illegal_floating_point_literal_pattern", description: r#"floating-point literals cannot be used in patterns"# },
    LintCompletion { label: "improper_ctypes", description: r#"proper use of libc types in foreign modules"# },
    LintCompletion { label: "improper_ctypes_definitions", description: r#"proper use of libc types in foreign item definitions"# },
    LintCompletion { label: "incomplete_features", description: r#"incomplete features that may function improperly in some or all cases"# },
    LintCompletion { label: "inline_no_sanitize", description: r#"detects incompatible use of `#[inline(always)]` and `#[no_sanitize(...)]`"# },
    LintCompletion { label: "intra_doc_link_resolution_failure", description: r#"failures in resolving intra-doc link targets"# },
    LintCompletion { label: "invalid_codeblock_attributes", description: r#"codeblock attribute looks a lot like a known one"# },
    LintCompletion { label: "invalid_value", description: r#"an invalid value is being created (such as a NULL reference)"# },
    LintCompletion { label: "irrefutable_let_patterns", description: r#"detects irrefutable patterns in if-let and while-let statements"# },
    LintCompletion { label: "late_bound_lifetime_arguments", description: r#"detects generic lifetime arguments in path segments with late bound lifetime parameters"# },
    LintCompletion { label: "mixed_script_confusables", description: r#"detects Unicode scripts whose mixed script confusables codepoints are solely used"# },
    LintCompletion { label: "mutable_borrow_reservation_conflict", description: r#"reservation of a two-phased borrow conflicts with other shared borrows"# },
    LintCompletion { label: "non_camel_case_types", description: r#"types, variants, traits and type parameters should have camel case names"# },
    LintCompletion { label: "non_shorthand_field_patterns", description: r#"using `Struct { x: x }` instead of `Struct { x }` in a pattern"# },
    LintCompletion { label: "non_snake_case", description: r#"variables, methods, functions, lifetime parameters and modules should have snake case names"# },
    LintCompletion { label: "non_upper_case_globals", description: r#"static constants should have uppercase identifiers"# },
    LintCompletion { label: "no_mangle_generic_items", description: r#"generic items must be mangled"# },
    LintCompletion { label: "overlapping_patterns", description: r#"detects overlapping patterns"# },
    LintCompletion { label: "path_statements", description: r#"path statements with no effect"# },
    LintCompletion { label: "private_in_public", description: r#"detect private items in public interfaces not caught by the old implementation"# },
    LintCompletion { label: "proc_macro_derive_resolution_fallback", description: r#"detects proc macro derives using inaccessible names from parent modules"# },
    LintCompletion { label: "redundant_semicolons", description: r#"detects unnecessary trailing semicolons"# },
    LintCompletion { label: "renamed_and_removed_lints", description: r#"lints that have been renamed or removed"# },
    LintCompletion { label: "safe_packed_borrows", description: r#"safe borrows of fields of packed structs were erroneously allowed"# },
    LintCompletion { label: "stable_features", description: r#"stable features found in `#[feature]` directive"# },
    LintCompletion { label: "trivial_bounds", description: r#"these bounds don't depend on an type parameters"# },
    LintCompletion { label: "type_alias_bounds", description: r#"bounds in type aliases are not enforced"# },
    LintCompletion { label: "tyvar_behind_raw_pointer", description: r#"raw pointer to an inference variable"# },
    LintCompletion { label: "uncommon_codepoints", description: r#"detects uncommon Unicode codepoints in identifiers"# },
    LintCompletion { label: "unconditional_recursion", description: r#"functions that cannot return without calling themselves"# },
    LintCompletion { label: "unknown_lints", description: r#"unrecognized lint attribute"# },
    LintCompletion { label: "unnameable_test_items", description: r#"detects an item that cannot be named being marked as `#[test_case]`"# },
    LintCompletion { label: "unreachable_code", description: r#"detects unreachable code paths"# },
    LintCompletion { label: "unreachable_patterns", description: r#"detects unreachable patterns"# },
    LintCompletion { label: "unstable_name_collisions", description: r#"detects name collision with an existing but unstable method"# },
    LintCompletion { label: "unused_allocation", description: r#"detects unnecessary allocations that can be eliminated"# },
    LintCompletion { label: "unused_assignments", description: r#"detect assignments that will never be read"# },
    LintCompletion { label: "unused_attributes", description: r#"detects attributes that were not used by the compiler"# },
    LintCompletion { label: "unused_braces", description: r#"unnecessary braces around an expression"# },
    LintCompletion { label: "unused_comparisons", description: r#"comparisons made useless by limits of the types involved"# },
    LintCompletion { label: "unused_doc_comments", description: r#"detects doc comments that aren't used by rustdoc"# },
    LintCompletion { label: "unused_features", description: r#"unused features found in crate-level `#[feature]` directives"# },
    LintCompletion { label: "unused_imports", description: r#"imports that are never used"# },
    LintCompletion { label: "unused_labels", description: r#"detects labels that are never used"# },
    LintCompletion { label: "unused_macros", description: r#"detects macros that were not used"# },
    LintCompletion { label: "unused_must_use", description: r#"unused result of a type flagged as `#[must_use]`"# },
    LintCompletion { label: "unused_mut", description: r#"detect mut variables which don't need to be mutable"# },
    LintCompletion { label: "unused_parens", description: r#"`if`, `match`, `while` and `return` do not need parentheses"# },
    LintCompletion { label: "unused_unsafe", description: r#"unnecessary use of an `unsafe` block"# },
    LintCompletion { label: "unused_variables", description: r#"detect variables which are not used in any way"# },
    LintCompletion { label: "warnings", description: r#"mass-change the level for lints which produce warnings"# },
    LintCompletion { label: "where_clauses_object_safety", description: r#"checks the object safety of where clauses"# },
    LintCompletion { label: "while_true", description: r#"suggest using `loop { }` instead of `while true { }`"# },
    LintCompletion { label: "ambiguous_associated_items", description: r#"ambiguous associated items"# },
    LintCompletion { label: "arithmetic_overflow", description: r#"arithmetic operation overflows"# },
    LintCompletion { label: "conflicting_repr_hints", description: r#"conflicts between `#[repr(..)]` hints that were previously accepted and used in practice"# },
    LintCompletion { label: "const_err", description: r#"constant evaluation detected erroneous expression"# },
    LintCompletion { label: "ill_formed_attribute_input", description: r#"ill-formed attribute inputs that were previously accepted and used in practice"# },
    LintCompletion { label: "incomplete_include", description: r#"trailing content in included file"# },
    LintCompletion { label: "invalid_type_param_default", description: r#"type parameter default erroneously allowed in invalid location"# },
    LintCompletion { label: "macro_expanded_macro_exports_accessed_by_absolute_paths", description: r#"macro-expanded `macro_export` macros from the current crate cannot be referred to by absolute paths"# },
    LintCompletion { label: "missing_fragment_specifier", description: r#"detects missing fragment specifiers in unused `macro_rules!` patterns"# },
    LintCompletion { label: "mutable_transmutes", description: r#"mutating transmuted &mut T from &T may cause undefined behavior"# },
    LintCompletion { label: "no_mangle_const_items", description: r#"const items will not have their symbols exported"# },
    LintCompletion { label: "order_dependent_trait_objects", description: r#"trait-object types were treated as different depending on marker-trait order"# },
    LintCompletion { label: "overflowing_literals", description: r#"literal out of range for its type"# },
    LintCompletion { label: "patterns_in_fns_without_body", description: r#"patterns in functions without body were erroneously allowed"# },
    LintCompletion { label: "pub_use_of_private_extern_crate", description: r#"detect public re-exports of private extern crates"# },
    LintCompletion { label: "soft_unstable", description: r#"a feature gate that doesn't break dependent crates"# },
    LintCompletion { label: "unconditional_panic", description: r#"operation will cause a panic at runtime"# },
    LintCompletion { label: "unknown_crate_types", description: r#"unknown crate type found in `#[crate_type]` directive"# },
];

#[cfg(test)]
mod tests {
    use expect_test::{expect, Expect};

    use crate::{test_utils::completion_list, CompletionKind};

    fn check(ra_fixture: &str, expect: Expect) {
        let actual = completion_list(ra_fixture, CompletionKind::Attribute);
        expect.assert_eq(&actual);
    }

    #[test]
    fn empty_derive_completion() {
        check(
            r#"
#[derive(<|>)]
struct Test {}
        "#,
            expect![[r#"
                at Clone
                at Clone, Copy
                at Debug
                at Default
                at Hash
                at PartialEq
                at PartialEq, Eq
                at PartialEq, PartialOrd
                at PartialEq, Eq, PartialOrd, Ord
            "#]],
        );
    }

    #[test]
    fn no_completion_for_incorrect_derive() {
        check(
            r#"
#[derive{<|>)]
struct Test {}
"#,
            expect![[r#""#]],
        )
    }

    #[test]
    fn derive_with_input_completion() {
        check(
            r#"
#[derive(serde::Serialize, PartialEq, <|>)]
struct Test {}
"#,
            expect![[r#"
                at Clone
                at Clone, Copy
                at Debug
                at Default
                at Hash
                at Eq
                at PartialOrd
                at Eq, PartialOrd, Ord
            "#]],
        )
    }

    #[test]
    fn test_attribute_completion() {
        check(
            r#"#[<|>]"#,
            expect![[r#"
                at allow(…)
                at automatically_derived
                at cfg_attr(…)
                at cfg(…)
                at cold
                at deny(…)
                at deprecated = ""
                at derive(…)
                at export_name = ""
                at doc = ""
                at forbid(…)
                at ignore = ""
                at inline(…)
                at link
                at link_name = ""
                at link_section = ""
                at macro_export
                at macro_use
                at must_use = ""
                at no_mangle
                at non_exhaustive
                at path = ""
                at proc_macro
                at proc_macro_attribute
                at proc_macro_derive(…)
                at repr(…)
                at should_panic(…)
                at target_feature = ""
                at test
                at track_caller
                at used
                at warn(…)
            "#]],
        )
    }

    #[test]
    fn test_attribute_completion_inside_nested_attr() {
        check(r#"#[cfg(<|>)]"#, expect![[]])
    }

    #[test]
    fn test_inner_attribute_completion() {
        check(
            r"#![<|>]",
            expect![[r#"
                at allow(…)
                at automatically_derived
                at cfg_attr(…)
                at cfg(…)
                at cold
                at crate_name = ""
                at deny(…)
                at deprecated = ""
                at derive(…)
                at export_name = ""
                at doc = ""
                at feature(…)
                at forbid(…)
                at global_allocator
                at ignore = ""
                at inline(…)
                at link
                at link_name = ""
                at link_section = ""
                at macro_export
                at macro_use
                at must_use = ""
                at no_link
                at no_implicit_prelude
                at no_main
                at no_mangle
                at no_std
                at non_exhaustive
                at panic_handler
                at path = ""
                at proc_macro
                at proc_macro_attribute
                at proc_macro_derive(…)
                at recursion_limit = …
                at repr(…)
                at should_panic(…)
                at target_feature = ""
                at test
                at track_caller
                at type_length_limit = …
                at used
                at warn(…)
                at windows_subsystem = ""
            "#]],
        );
    }
}