1 #![feature(let_chains)]
3 #![feature(rustc_attrs)]
4 #![feature(type_alias_impl_trait)]
5 #![deny(rustc::untranslatable_diagnostic)]
6 #![deny(rustc::diagnostic_outside_of_impl)]
11 use fluent_bundle
::FluentResource
;
12 use fluent_syntax
::parser
::ParserError
;
13 use icu_provider_adapters
::fallback
::{LocaleFallbackProvider, LocaleFallbacker}
;
14 use rustc_data_structures
::sync
::Lrc
;
15 use rustc_macros
::{fluent_messages, Decodable, Encodable}
;
18 use std
::error
::Error
;
22 use std
::path
::{Path, PathBuf}
;
24 #[cfg(not(parallel_compiler))]
25 use std
::cell
::LazyCell
as Lazy
;
26 #[cfg(parallel_compiler)]
27 use std
::sync
::LazyLock
as Lazy
;
29 #[cfg(parallel_compiler)]
30 use intl_memoizer
::concurrent
::IntlLangMemoizer
;
31 #[cfg(not(parallel_compiler))]
32 use intl_memoizer
::IntlLangMemoizer
;
34 pub use fluent_bundle
::{self, types::FluentType, FluentArgs, FluentError, FluentValue}
;
35 pub use unic_langid
::{langid, LanguageIdentifier}
;
37 // Generates `DEFAULT_LOCALE_RESOURCES` static and `fluent_generated` module.
39 // tidy-alphabetical-start
40 ast_lowering
=> "../locales/en-US/ast_lowering.ftl",
41 ast_passes
=> "../locales/en-US/ast_passes.ftl",
42 attr
=> "../locales/en-US/attr.ftl",
43 borrowck
=> "../locales/en-US/borrowck.ftl",
44 builtin_macros
=> "../locales/en-US/builtin_macros.ftl",
45 codegen_gcc
=> "../locales/en-US/codegen_gcc.ftl",
46 codegen_llvm
=> "../locales/en-US/codegen_llvm.ftl",
47 codegen_ssa
=> "../locales/en-US/codegen_ssa.ftl",
48 compiletest
=> "../locales/en-US/compiletest.ftl",
49 const_eval
=> "../locales/en-US/const_eval.ftl",
50 driver
=> "../locales/en-US/driver.ftl",
51 errors
=> "../locales/en-US/errors.ftl",
52 expand
=> "../locales/en-US/expand.ftl",
53 hir_analysis
=> "../locales/en-US/hir_analysis.ftl",
54 hir_typeck
=> "../locales/en-US/hir_typeck.ftl",
55 infer
=> "../locales/en-US/infer.ftl",
56 interface
=> "../locales/en-US/interface.ftl",
57 lint
=> "../locales/en-US/lint.ftl",
58 metadata
=> "../locales/en-US/metadata.ftl",
59 middle
=> "../locales/en-US/middle.ftl",
60 mir_build
=> "../locales/en-US/mir_build.ftl",
61 mir_dataflow
=> "../locales/en-US/mir_dataflow.ftl",
62 monomorphize
=> "../locales/en-US/monomorphize.ftl",
63 parse
=> "../locales/en-US/parse.ftl",
64 passes
=> "../locales/en-US/passes.ftl",
65 plugin_impl
=> "../locales/en-US/plugin_impl.ftl",
66 privacy
=> "../locales/en-US/privacy.ftl",
67 query_system
=> "../locales/en-US/query_system.ftl",
68 resolve
=> "../locales/en-US/resolve.ftl",
69 save_analysis
=> "../locales/en-US/save_analysis.ftl",
70 session
=> "../locales/en-US/session.ftl",
71 symbol_mangling
=> "../locales/en-US/symbol_mangling.ftl",
72 trait_selection
=> "../locales/en-US/trait_selection.ftl",
73 ty_utils
=> "../locales/en-US/ty_utils.ftl",
74 // tidy-alphabetical-end
77 pub use fluent_generated
::{self as fluent, DEFAULT_LOCALE_RESOURCES}
;
79 pub type FluentBundle
= fluent_bundle
::bundle
::FluentBundle
<FluentResource
, IntlLangMemoizer
>;
81 #[cfg(parallel_compiler)]
82 fn new_bundle(locales
: Vec
<LanguageIdentifier
>) -> FluentBundle
{
83 FluentBundle
::new_concurrent(locales
)
86 #[cfg(not(parallel_compiler))]
87 fn new_bundle(locales
: Vec
<LanguageIdentifier
>) -> FluentBundle
{
88 FluentBundle
::new(locales
)
92 pub enum TranslationBundleError
{
93 /// Failed to read from `.ftl` file.
95 /// Failed to parse contents of `.ftl` file.
96 ParseFtl(ParserError
),
97 /// Failed to add `FluentResource` to `FluentBundle`.
98 AddResource(FluentError
),
99 /// `$sysroot/share/locale/$locale` does not exist.
101 /// Cannot read directory entries of `$sysroot/share/locale/$locale`.
102 ReadLocalesDir(io
::Error
),
103 /// Cannot read directory entry of `$sysroot/share/locale/$locale`.
104 ReadLocalesDirEntry(io
::Error
),
105 /// `$sysroot/share/locale/$locale` is not a directory.
109 impl fmt
::Display
for TranslationBundleError
{
110 fn fmt(&self, f
: &mut fmt
::Formatter
<'_
>) -> fmt
::Result
{
112 TranslationBundleError
::ReadFtl(e
) => write
!(f
, "could not read ftl file: {}", e
),
113 TranslationBundleError
::ParseFtl(e
) => {
114 write
!(f
, "could not parse ftl file: {}", e
)
116 TranslationBundleError
::AddResource(e
) => write
!(f
, "failed to add resource: {}", e
),
117 TranslationBundleError
::MissingLocale
=> write
!(f
, "missing locale directory"),
118 TranslationBundleError
::ReadLocalesDir(e
) => {
119 write
!(f
, "could not read locales dir: {}", e
)
121 TranslationBundleError
::ReadLocalesDirEntry(e
) => {
122 write
!(f
, "could not read locales dir entry: {}", e
)
124 TranslationBundleError
::LocaleIsNotDir
=> {
125 write
!(f
, "`$sysroot/share/locales/$locale` is not a directory")
131 impl Error
for TranslationBundleError
{
132 fn source(&self) -> Option
<&(dyn Error
+ '
static)> {
134 TranslationBundleError
::ReadFtl(e
) => Some(e
),
135 TranslationBundleError
::ParseFtl(e
) => Some(e
),
136 TranslationBundleError
::AddResource(e
) => Some(e
),
137 TranslationBundleError
::MissingLocale
=> None
,
138 TranslationBundleError
::ReadLocalesDir(e
) => Some(e
),
139 TranslationBundleError
::ReadLocalesDirEntry(e
) => Some(e
),
140 TranslationBundleError
::LocaleIsNotDir
=> None
,
145 impl From
<(FluentResource
, Vec
<ParserError
>)> for TranslationBundleError
{
146 fn from((_
, mut errs
): (FluentResource
, Vec
<ParserError
>)) -> Self {
147 TranslationBundleError
::ParseFtl(errs
.pop().expect("failed ftl parse with no errors"))
151 impl From
<Vec
<FluentError
>> for TranslationBundleError
{
152 fn from(mut errs
: Vec
<FluentError
>) -> Self {
153 TranslationBundleError
::AddResource(
154 errs
.pop().expect("failed adding resource to bundle with no errors"),
159 /// Returns Fluent bundle with the user's locale resources from
160 /// `$sysroot/share/locale/$requested_locale/*.ftl`.
162 /// If `-Z additional-ftl-path` was provided, load that resource and add it to the bundle
163 /// (overriding any conflicting messages).
164 #[instrument(level = "trace")]
165 pub fn fluent_bundle(
166 mut user_provided_sysroot
: Option
<PathBuf
>,
167 mut sysroot_candidates
: Vec
<PathBuf
>,
168 requested_locale
: Option
<LanguageIdentifier
>,
169 additional_ftl_path
: Option
<&Path
>,
170 with_directionality_markers
: bool
,
171 ) -> Result
<Option
<Lrc
<FluentBundle
>>, TranslationBundleError
> {
172 if requested_locale
.is_none() && additional_ftl_path
.is_none() {
176 let fallback_locale
= langid
!("en-US");
177 let requested_fallback_locale
= requested_locale
.as_ref() == Some(&fallback_locale
);
179 // If there is only `-Z additional-ftl-path`, assume locale is "en-US", otherwise use user
181 let locale
= requested_locale
.clone().unwrap_or(fallback_locale
);
183 let mut bundle
= new_bundle(vec
![locale
]);
185 // Fluent diagnostics can insert directionality isolation markers around interpolated variables
186 // indicating that there may be a shift from right-to-left to left-to-right text (or
187 // vice-versa). These are disabled because they are sometimes visible in the error output, but
188 // may be worth investigating in future (for example: if type names are left-to-right and the
189 // surrounding diagnostic messages are right-to-left, then these might be helpful).
190 bundle
.set_use_isolating(with_directionality_markers
);
192 // If the user requests the default locale then don't try to load anything.
193 if !requested_fallback_locale
&& let Some(requested_locale
) = requested_locale
{
194 let mut found_resources
= false;
195 for sysroot
in user_provided_sysroot
.iter_mut().chain(sysroot_candidates
.iter_mut()) {
196 sysroot
.push("share");
197 sysroot
.push("locale");
198 sysroot
.push(requested_locale
.to_string());
201 if !sysroot
.exists() {
206 if !sysroot
.is_dir() {
207 return Err(TranslationBundleError
::LocaleIsNotDir
);
210 for entry
in sysroot
.read_dir().map_err(TranslationBundleError
::ReadLocalesDir
)?
{
211 let entry
= entry
.map_err(TranslationBundleError
::ReadLocalesDirEntry
)?
;
212 let path
= entry
.path();
214 if path
.extension().and_then(|s
| s
.to_str()) != Some("ftl") {
220 fs
::read_to_string(path
).map_err(TranslationBundleError
::ReadFtl
)?
;
222 FluentResource
::try_new(resource_str
).map_err(TranslationBundleError
::from
)?
;
224 bundle
.add_resource(resource
).map_err(TranslationBundleError
::from
)?
;
225 found_resources
= true;
229 if !found_resources
{
230 return Err(TranslationBundleError
::MissingLocale
);
234 if let Some(additional_ftl_path
) = additional_ftl_path
{
236 fs
::read_to_string(additional_ftl_path
).map_err(TranslationBundleError
::ReadFtl
)?
;
238 FluentResource
::try_new(resource_str
).map_err(TranslationBundleError
::from
)?
;
240 bundle
.add_resource_overriding(resource
);
243 let bundle
= Lrc
::new(bundle
);
247 /// Type alias for the result of `fallback_fluent_bundle` - a reference-counted pointer to a lazily
248 /// evaluated fluent bundle.
249 pub type LazyFallbackBundle
= Lrc
<Lazy
<FluentBundle
, impl FnOnce() -> FluentBundle
>>;
251 /// Return the default `FluentBundle` with standard "en-US" diagnostic messages.
252 #[instrument(level = "trace")]
253 pub fn fallback_fluent_bundle(
254 resources
: &'
static [&'
static str],
255 with_directionality_markers
: bool
,
256 ) -> LazyFallbackBundle
{
257 Lrc
::new(Lazy
::new(move || {
258 let mut fallback_bundle
= new_bundle(vec
![langid
!("en-US")]);
259 // See comment in `fluent_bundle`.
260 fallback_bundle
.set_use_isolating(with_directionality_markers
);
262 for resource
in resources
{
263 let resource
= FluentResource
::try_new(resource
.to_string())
264 .expect("failed to parse fallback fluent resource");
266 fallback_bundle
.add_resource_overriding(resource
);
273 /// Identifier for the Fluent message/attribute corresponding to a diagnostic message.
274 type FluentId
= Cow
<'
static, str>;
276 /// Abstraction over a message in a subdiagnostic (i.e. label, note, help, etc) to support both
277 /// translatable and non-translatable diagnostic messages.
279 /// Translatable messages for subdiagnostics are typically attributes attached to a larger Fluent
280 /// message so messages of this type must be combined with a `DiagnosticMessage` (using
281 /// `DiagnosticMessage::with_subdiagnostic_message`) before rendering. However, subdiagnostics from
282 /// the `Subdiagnostic` derive refer to Fluent identifiers directly.
283 #[rustc_diagnostic_item = "SubdiagnosticMessage"]
284 pub enum SubdiagnosticMessage
{
285 /// Non-translatable diagnostic message.
286 // FIXME(davidtwco): can a `Cow<'static, str>` be used here?
288 /// Translatable message which has already been translated eagerly.
290 /// Some diagnostics have repeated subdiagnostics where the same interpolated variables would
291 /// be instantiated multiple times with different values. As translation normally happens
292 /// immediately prior to emission, after the diagnostic and subdiagnostic derive logic has run,
293 /// the setting of diagnostic arguments in the derived code will overwrite previous variable
294 /// values and only the final value will be set when translation occurs - resulting in
295 /// incorrect diagnostics. Eager translation results in translation for a subdiagnostic
296 /// happening immediately after the subdiagnostic derive's logic has been run. This variant
297 /// stores messages which have been translated eagerly.
298 // FIXME(#100717): can a `Cow<'static, str>` be used here?
300 /// Identifier of a Fluent message. Instances of this variant are generated by the
301 /// `Subdiagnostic` derive.
302 FluentIdentifier(FluentId
),
303 /// Attribute of a Fluent message. Needs to be combined with a Fluent identifier to produce an
304 /// actual translated message. Instances of this variant are generated by the `fluent_messages`
307 /// <https://projectfluent.org/fluent/guide/attributes.html>
308 FluentAttr(FluentId
),
311 /// `From` impl that enables existing diagnostic calls to functions which now take
312 /// `impl Into<SubdiagnosticMessage>` to continue to work as before.
313 impl<S
: Into
<String
>> From
<S
> for SubdiagnosticMessage
{
314 fn from(s
: S
) -> Self {
315 SubdiagnosticMessage
::Str(s
.into())
319 /// Abstraction over a message in a diagnostic to support both translatable and non-translatable
320 /// diagnostic messages.
322 /// Intended to be removed once diagnostics are entirely translatable.
323 #[derive(Clone, Debug, PartialEq, Eq, Hash, Encodable, Decodable)]
324 #[rustc_diagnostic_item = "DiagnosticMessage"]
325 pub enum DiagnosticMessage
{
326 /// Non-translatable diagnostic message.
327 // FIXME(#100717): can a `Cow<'static, str>` be used here?
329 /// Translatable message which has already been translated eagerly.
331 /// Some diagnostics have repeated subdiagnostics where the same interpolated variables would
332 /// be instantiated multiple times with different values. As translation normally happens
333 /// immediately prior to emission, after the diagnostic and subdiagnostic derive logic has run,
334 /// the setting of diagnostic arguments in the derived code will overwrite previous variable
335 /// values and only the final value will be set when translation occurs - resulting in
336 /// incorrect diagnostics. Eager translation results in translation for a subdiagnostic
337 /// happening immediately after the subdiagnostic derive's logic has been run. This variant
338 /// stores messages which have been translated eagerly.
339 // FIXME(#100717): can a `Cow<'static, str>` be used here?
341 /// Identifier for a Fluent message (with optional attribute) corresponding to the diagnostic
344 /// <https://projectfluent.org/fluent/guide/hello.html>
345 /// <https://projectfluent.org/fluent/guide/attributes.html>
346 FluentIdentifier(FluentId
, Option
<FluentId
>),
349 impl DiagnosticMessage
{
350 /// Given a `SubdiagnosticMessage` which may contain a Fluent attribute, create a new
351 /// `DiagnosticMessage` that combines that attribute with the Fluent identifier of `self`.
353 /// - If the `SubdiagnosticMessage` is non-translatable then return the message as a
354 /// `DiagnosticMessage`.
355 /// - If `self` is non-translatable then return `self`'s message.
356 pub fn with_subdiagnostic_message(&self, sub
: SubdiagnosticMessage
) -> Self {
357 let attr
= match sub
{
358 SubdiagnosticMessage
::Str(s
) => return DiagnosticMessage
::Str(s
),
359 SubdiagnosticMessage
::Eager(s
) => return DiagnosticMessage
::Eager(s
),
360 SubdiagnosticMessage
::FluentIdentifier(id
) => {
361 return DiagnosticMessage
::FluentIdentifier(id
, None
);
363 SubdiagnosticMessage
::FluentAttr(attr
) => attr
,
367 DiagnosticMessage
::Str(s
) => DiagnosticMessage
::Str(s
.clone()),
368 DiagnosticMessage
::Eager(s
) => DiagnosticMessage
::Eager(s
.clone()),
369 DiagnosticMessage
::FluentIdentifier(id
, _
) => {
370 DiagnosticMessage
::FluentIdentifier(id
.clone(), Some(attr
))
376 /// `From` impl that enables existing diagnostic calls to functions which now take
377 /// `impl Into<DiagnosticMessage>` to continue to work as before.
378 impl<S
: Into
<String
>> From
<S
> for DiagnosticMessage
{
379 fn from(s
: S
) -> Self {
380 DiagnosticMessage
::Str(s
.into())
384 /// A workaround for "good path" ICEs when formatting types in disabled lints.
386 /// Delays formatting until `.into(): DiagnosticMessage` is used.
387 pub struct DelayDm
<F
>(pub F
);
389 impl<F
: FnOnce() -> String
> From
<DelayDm
<F
>> for DiagnosticMessage
{
390 fn from(DelayDm(f
): DelayDm
<F
>) -> Self {
391 DiagnosticMessage
::from(f())
395 /// Translating *into* a subdiagnostic message from a diagnostic message is a little strange - but
396 /// the subdiagnostic functions (e.g. `span_label`) take a `SubdiagnosticMessage` and the
397 /// subdiagnostic derive refers to typed identifiers that are `DiagnosticMessage`s, so need to be
398 /// able to convert between these, as much as they'll be converted back into `DiagnosticMessage`
399 /// using `with_subdiagnostic_message` eventually. Don't use this other than for the derive.
400 impl Into
<SubdiagnosticMessage
> for DiagnosticMessage
{
401 fn into(self) -> SubdiagnosticMessage
{
403 DiagnosticMessage
::Str(s
) => SubdiagnosticMessage
::Str(s
),
404 DiagnosticMessage
::Eager(s
) => SubdiagnosticMessage
::Eager(s
),
405 DiagnosticMessage
::FluentIdentifier(id
, None
) => {
406 SubdiagnosticMessage
::FluentIdentifier(id
)
408 // There isn't really a sensible behaviour for this because it loses information but
409 // this is the most sensible of the behaviours.
410 DiagnosticMessage
::FluentIdentifier(_
, Some(attr
)) => {
411 SubdiagnosticMessage
::FluentAttr(attr
)
417 /// A span together with some additional data.
418 #[derive(Clone, Debug)]
419 pub struct SpanLabel
{
420 /// The span we are going to include in the final snippet.
423 /// Is this a primary span? This is the "locus" of the message,
424 /// and is indicated with a `^^^^` underline, versus `----`.
425 pub is_primary
: bool
,
427 /// What label should we attach to this span (if any)?
428 pub label
: Option
<DiagnosticMessage
>,
431 /// A collection of `Span`s.
433 /// Spans have two orthogonal attributes:
435 /// - They can be *primary spans*. In this case they are the locus of
436 /// the error, and would be rendered with `^^^`.
437 /// - They can have a *label*. In this case, the label is written next
438 /// to the mark in the snippet when we render.
439 #[derive(Clone, Debug, Hash, PartialEq, Eq, Encodable, Decodable)]
440 pub struct MultiSpan
{
441 primary_spans
: Vec
<Span
>,
442 span_labels
: Vec
<(Span
, DiagnosticMessage
)>,
447 pub fn new() -> MultiSpan
{
448 MultiSpan { primary_spans: vec![], span_labels: vec![] }
451 pub fn from_span(primary_span
: Span
) -> MultiSpan
{
452 MultiSpan { primary_spans: vec![primary_span], span_labels: vec![] }
455 pub fn from_spans(mut vec
: Vec
<Span
>) -> MultiSpan
{
457 MultiSpan { primary_spans: vec, span_labels: vec![] }
460 pub fn push_span_label(&mut self, span
: Span
, label
: impl Into
<DiagnosticMessage
>) {
461 self.span_labels
.push((span
, label
.into()));
464 /// Selects the first primary span (if any).
465 pub fn primary_span(&self) -> Option
<Span
> {
466 self.primary_spans
.first().cloned()
469 /// Returns all primary spans.
470 pub fn primary_spans(&self) -> &[Span
] {
474 /// Returns `true` if any of the primary spans are displayable.
475 pub fn has_primary_spans(&self) -> bool
{
479 /// Returns `true` if this contains only a dummy primary span with any hygienic context.
480 pub fn is_dummy(&self) -> bool
{
481 self.primary_spans
.iter().all(|sp
| sp
.is_dummy())
484 /// Replaces all occurrences of one Span with another. Used to move `Span`s in areas that don't
485 /// display well (like std macros). Returns whether replacements occurred.
486 pub fn replace(&mut self, before
: Span
, after
: Span
) -> bool
{
487 let mut replacements_occurred
= false;
488 for primary_span
in &mut self.primary_spans
{
489 if *primary_span
== before
{
490 *primary_span
= after
;
491 replacements_occurred
= true;
494 for span_label
in &mut self.span_labels
{
495 if span_label
.0 == before
{
496 span_label
.0 = after
;
497 replacements_occurred
= true;
500 replacements_occurred
503 /// Returns the strings to highlight. We always ensure that there
504 /// is an entry for each of the primary spans -- for each primary
505 /// span `P`, if there is at least one label with span `P`, we return
506 /// those labels (marked as primary). But otherwise we return
507 /// `SpanLabel` instances with empty labels.
508 pub fn span_labels(&self) -> Vec
<SpanLabel
> {
509 let is_primary
= |span
| self.primary_spans
.contains(&span
);
511 let mut span_labels
= self
514 .map(|&(span
, ref label
)| SpanLabel
{
516 is_primary
: is_primary(span
),
517 label
: Some(label
.clone()),
519 .collect
::<Vec
<_
>>();
521 for &span
in &self.primary_spans
{
522 if !span_labels
.iter().any(|sl
| sl
.span
== span
) {
523 span_labels
.push(SpanLabel { span, is_primary: true, label: None }
);
530 /// Returns `true` if any of the span labels is displayable.
531 pub fn has_span_labels(&self) -> bool
{
532 self.span_labels
.iter().any(|(sp
, _
)| !sp
.is_dummy())
536 impl From
<Span
> for MultiSpan
{
537 fn from(span
: Span
) -> MultiSpan
{
538 MultiSpan
::from_span(span
)
542 impl From
<Vec
<Span
>> for MultiSpan
{
543 fn from(spans
: Vec
<Span
>) -> MultiSpan
{
544 MultiSpan
::from_spans(spans
)
548 fn icu_locale_from_unic_langid(lang
: LanguageIdentifier
) -> Option
<icu_locid
::Locale
> {
549 icu_locid
::Locale
::try_from_bytes(lang
.to_string().as_bytes()).ok()
552 pub fn fluent_value_from_str_list_sep_by_and(l
: Vec
<Cow
<'_
, str>>) -> FluentValue
<'_
> {
553 // Fluent requires 'static value here for its AnyEq usages.
554 #[derive(Clone, PartialEq, Debug)]
555 struct FluentStrListSepByAnd(Vec
<String
>);
557 impl FluentType
for FluentStrListSepByAnd
{
558 fn duplicate(&self) -> Box
<dyn FluentType
+ Send
> {
559 Box
::new(self.clone())
562 fn as_string(&self, intls
: &intl_memoizer
::IntlLangMemoizer
) -> Cow
<'
static, str> {
564 .with_try_get
::<MemoizableListFormatter
, _
, _
>((), |list_formatter
| {
565 list_formatter
.format_to_string(self.0.iter
())
571 #[cfg(not(parallel_compiler))]
572 fn as_string_threadsafe(
574 _intls
: &intl_memoizer
::concurrent
::IntlLangMemoizer
,
575 ) -> Cow
<'
static, str> {
576 unreachable
!("`as_string_threadsafe` is not used in non-parallel rustc")
579 #[cfg(parallel_compiler)]
580 fn as_string_threadsafe(
582 intls
: &intl_memoizer
::concurrent
::IntlLangMemoizer
,
583 ) -> Cow
<'
static, str> {
585 .with_try_get
::<MemoizableListFormatter
, _
, _
>((), |list_formatter
| {
586 list_formatter
.format_to_string(self.0.iter
())
593 struct MemoizableListFormatter(icu_list
::ListFormatter
);
595 impl std
::ops
::Deref
for MemoizableListFormatter
{
596 type Target
= icu_list
::ListFormatter
;
597 fn deref(&self) -> &Self::Target
{
602 impl intl_memoizer
::Memoizable
for MemoizableListFormatter
{
606 fn construct(lang
: LanguageIdentifier
, _args
: Self::Args
) -> Result
<Self, Self::Error
>
610 let baked_data_provider
= rustc_baked_icu_data
::baked_data_provider();
611 let locale_fallbacker
=
612 LocaleFallbacker
::try_new_with_any_provider(&baked_data_provider
)
613 .expect("Failed to create fallback provider");
615 LocaleFallbackProvider
::new_with_fallbacker(baked_data_provider
, locale_fallbacker
);
616 let locale
= icu_locale_from_unic_langid(lang
)
617 .unwrap_or_else(|| rustc_baked_icu_data
::supported_locales
::EN
);
619 icu_list
::ListFormatter
::try_new_and_with_length_with_any_provider(
622 icu_list
::ListLength
::Wide
,
624 .expect("Failed to create list formatter");
626 Ok(MemoizableListFormatter(list_formatter
))
630 let l
= l
.into_iter().map(|x
| x
.into_owned()).collect();
632 FluentValue
::Custom(Box
::new(FluentStrListSepByAnd(l
)))