css_ast/
encoding_label.rs

1pub use css_lexer::AtomSet;
2use derive_atom_set::AtomSet as DeriveAtomSet;
3
4/// Every label in the [Encoding Standard], matched ASCII case-insensitively.
5///
6/// A label names an encoding, and an encoding has several labels. [EncodingLabel::compact] gives
7/// the shortest label of an encoding, so compare compacted labels to compare encodings.
8///
9/// Variant names spell their label with `-` written as `_`. The labels that hold `_`, `.` or
10/// `:` cannot be spelled that way, so they mangle those bytes to `_u_`, `_d_` and `_c_` and
11/// carry an explicit `#[atom]`.
12///
13/// [Encoding Standard]: https://encoding.spec.whatwg.org/#names-and-labels
14#[allow(non_camel_case_types)]
15#[derive(DeriveAtomSet, Debug, Default, Copy, Clone, PartialEq, Eq)]
16pub enum EncodingLabel {
17	#[default]
18	Unknown,
19
20	_866,
21	#[atom("ansi_x3.4-1968")]
22	Ansi_u_x3_d_4_1968,
23	Arabic,
24	Ascii,
25	Asmo_708,
26	Big5,
27	Big5_hkscs,
28	Chinese,
29	Cn_big5,
30	Cp1250,
31	Cp1251,
32	Cp1252,
33	Cp1253,
34	Cp1254,
35	Cp1255,
36	Cp1256,
37	Cp1257,
38	Cp1258,
39	Cp819,
40	Cp866,
41	Csbig5,
42	Cseuckr,
43	Cseucpkdfmtjapanese,
44	Csgb2312,
45	Csibm866,
46	Csiso2022jp,
47	Csiso2022kr,
48	Csiso58gb231280,
49	Csiso88596e,
50	Csiso88596i,
51	Csiso88598e,
52	Csiso88598i,
53	Csisolatin1,
54	Csisolatin2,
55	Csisolatin3,
56	Csisolatin4,
57	Csisolatin5,
58	Csisolatin6,
59	Csisolatin9,
60	Csisolatinarabic,
61	Csisolatincyrillic,
62	Csisolatingreek,
63	Csisolatinhebrew,
64	Cskoi8r,
65	Csksc56011987,
66	Csmacintosh,
67	Csshiftjis,
68	Csunicode,
69	Cyrillic,
70	Dos_874,
71	Ecma_114,
72	Ecma_118,
73	#[atom("elot_928")]
74	Elot_u_928,
75	Euc_jp,
76	Euc_kr,
77	Gb18030,
78	Gb2312,
79	#[atom("gb_2312")]
80	Gb_u_2312,
81	#[atom("gb_2312-80")]
82	Gb_u_2312_80,
83	Gbk,
84	Greek,
85	Greek8,
86	Hebrew,
87	Hz_gb_2312,
88	Ibm819,
89	Ibm866,
90	Iso_10646_ucs_2,
91	Iso_2022_cn,
92	Iso_2022_cn_ext,
93	Iso_2022_jp,
94	Iso_2022_kr,
95	Iso_8859_1,
96	Iso_8859_10,
97	Iso_8859_11,
98	Iso_8859_13,
99	Iso_8859_14,
100	Iso_8859_15,
101	Iso_8859_16,
102	Iso_8859_2,
103	Iso_8859_3,
104	Iso_8859_4,
105	Iso_8859_5,
106	Iso_8859_6,
107	Iso_8859_6_e,
108	Iso_8859_6_i,
109	Iso_8859_7,
110	Iso_8859_8,
111	Iso_8859_8_e,
112	Iso_8859_8_i,
113	Iso_8859_9,
114	Iso_ir_100,
115	Iso_ir_101,
116	Iso_ir_109,
117	Iso_ir_110,
118	Iso_ir_126,
119	Iso_ir_127,
120	Iso_ir_138,
121	Iso_ir_144,
122	Iso_ir_148,
123	Iso_ir_149,
124	Iso_ir_157,
125	Iso_ir_58,
126	Iso8859_1,
127	Iso8859_10,
128	Iso8859_11,
129	Iso8859_13,
130	Iso8859_14,
131	Iso8859_15,
132	Iso8859_2,
133	Iso8859_3,
134	Iso8859_4,
135	Iso8859_5,
136	Iso8859_6,
137	Iso8859_7,
138	Iso8859_8,
139	Iso8859_9,
140	Iso88591,
141	Iso885910,
142	Iso885911,
143	Iso885913,
144	Iso885914,
145	Iso885915,
146	Iso88592,
147	Iso88593,
148	Iso88594,
149	Iso88595,
150	Iso88596,
151	Iso88597,
152	Iso88598,
153	Iso88599,
154	#[atom("iso_8859-1")]
155	Iso_u_8859_1,
156	#[atom("iso_8859-15")]
157	Iso_u_8859_15,
158	#[atom("iso_8859-1:1987")]
159	Iso_u_8859_1_c_1987,
160	#[atom("iso_8859-2")]
161	Iso_u_8859_2,
162	#[atom("iso_8859-2:1987")]
163	Iso_u_8859_2_c_1987,
164	#[atom("iso_8859-3")]
165	Iso_u_8859_3,
166	#[atom("iso_8859-3:1988")]
167	Iso_u_8859_3_c_1988,
168	#[atom("iso_8859-4")]
169	Iso_u_8859_4,
170	#[atom("iso_8859-4:1988")]
171	Iso_u_8859_4_c_1988,
172	#[atom("iso_8859-5")]
173	Iso_u_8859_5,
174	#[atom("iso_8859-5:1988")]
175	Iso_u_8859_5_c_1988,
176	#[atom("iso_8859-6")]
177	Iso_u_8859_6,
178	#[atom("iso_8859-6:1987")]
179	Iso_u_8859_6_c_1987,
180	#[atom("iso_8859-7")]
181	Iso_u_8859_7,
182	#[atom("iso_8859-7:1987")]
183	Iso_u_8859_7_c_1987,
184	#[atom("iso_8859-8")]
185	Iso_u_8859_8,
186	#[atom("iso_8859-8:1988")]
187	Iso_u_8859_8_c_1988,
188	#[atom("iso_8859-9")]
189	Iso_u_8859_9,
190	#[atom("iso_8859-9:1989")]
191	Iso_u_8859_9_c_1989,
192	Koi,
193	Koi8,
194	Koi8_r,
195	Koi8_ru,
196	Koi8_u,
197	#[atom("koi8_r")]
198	Koi8_u_r,
199	Korean,
200	#[atom("ks_c_5601-1987")]
201	Ks_u_c_u_5601_1987,
202	#[atom("ks_c_5601-1989")]
203	Ks_u_c_u_5601_1989,
204	Ksc5601,
205	#[atom("ksc_5601")]
206	Ksc_u_5601,
207	L1,
208	L2,
209	L3,
210	L4,
211	L5,
212	L6,
213	L9,
214	Latin1,
215	Latin2,
216	Latin3,
217	Latin4,
218	Latin5,
219	Latin6,
220	Logical,
221	Mac,
222	Macintosh,
223	Ms932,
224	#[atom("ms_kanji")]
225	Ms_u_kanji,
226	Replacement,
227	Shift_jis,
228	#[atom("shift_jis")]
229	Shift_u_jis,
230	Sjis,
231	#[atom("sun_eu_greek")]
232	Sun_u_eu_u_greek,
233	Tis_620,
234	Ucs_2,
235	Unicode,
236	Unicode_1_1_utf_8,
237	Unicode11utf8,
238	Unicode20utf8,
239	Unicodefeff,
240	Unicodefffe,
241	Us_ascii,
242	Utf_16,
243	Utf_16be,
244	Utf_16le,
245	Utf_8,
246	Utf8,
247	Visual,
248	Windows_1250,
249	Windows_1251,
250	Windows_1252,
251	Windows_1253,
252	Windows_1254,
253	Windows_1255,
254	Windows_1256,
255	Windows_1257,
256	Windows_1258,
257	Windows_31j,
258	Windows_874,
259	Windows_949,
260	X_cp1250,
261	X_cp1251,
262	X_cp1252,
263	X_cp1253,
264	X_cp1254,
265	X_cp1255,
266	X_cp1256,
267	X_cp1257,
268	X_cp1258,
269	X_euc_jp,
270	X_gbk,
271	X_mac_cyrillic,
272	X_mac_roman,
273	X_mac_ukrainian,
274	X_sjis,
275	X_unicode20utf8,
276	X_user_defined,
277	X_x_big5,
278}
279
280impl EncodingLabel {
281	/// The shortest label naming the same encoding as each variant, indexed by discriminant.
282	const COMPACT: [Self; 229] = [
283		Self::Unknown,
284		Self::_866,
285		Self::L1,
286		Self::Arabic,
287		Self::L1,
288		Self::Arabic,
289		Self::Big5,
290		Self::Big5,
291		Self::Gbk,
292		Self::Big5,
293		Self::Cp1250,
294		Self::Cp1251,
295		Self::L1,
296		Self::Cp1253,
297		Self::L5,
298		Self::Cp1255,
299		Self::Cp1256,
300		Self::Cp1257,
301		Self::Cp1258,
302		Self::L1,
303		Self::_866,
304		Self::Big5,
305		Self::Euc_kr,
306		Self::Euc_jp,
307		Self::Gbk,
308		Self::_866,
309		Self::Csiso2022jp,
310		Self::Hz_gb_2312,
311		Self::Gbk,
312		Self::Arabic,
313		Self::Arabic,
314		Self::Hebrew,
315		Self::Logical,
316		Self::L1,
317		Self::L2,
318		Self::L3,
319		Self::L4,
320		Self::L5,
321		Self::L6,
322		Self::L9,
323		Self::Arabic,
324		Self::Cyrillic,
325		Self::Greek,
326		Self::Hebrew,
327		Self::Koi,
328		Self::Euc_kr,
329		Self::Mac,
330		Self::Sjis,
331		Self::Unknown,
332		Self::Cyrillic,
333		Self::Dos_874,
334		Self::Arabic,
335		Self::Greek,
336		Self::Greek,
337		Self::Euc_jp,
338		Self::Euc_kr,
339		Self::Gb18030,
340		Self::Gbk,
341		Self::Gbk,
342		Self::Gbk,
343		Self::Gbk,
344		Self::Greek,
345		Self::Greek,
346		Self::Hebrew,
347		Self::Hz_gb_2312,
348		Self::L1,
349		Self::_866,
350		Self::Unknown,
351		Self::Hz_gb_2312,
352		Self::Hz_gb_2312,
353		Self::Csiso2022jp,
354		Self::Hz_gb_2312,
355		Self::L1,
356		Self::L6,
357		Self::Dos_874,
358		Self::Iso885913,
359		Self::Iso885914,
360		Self::L9,
361		Self::Iso_8859_16,
362		Self::L2,
363		Self::L3,
364		Self::L4,
365		Self::Cyrillic,
366		Self::Arabic,
367		Self::Arabic,
368		Self::Arabic,
369		Self::Greek,
370		Self::Hebrew,
371		Self::Hebrew,
372		Self::Logical,
373		Self::L5,
374		Self::L1,
375		Self::L2,
376		Self::L3,
377		Self::L4,
378		Self::Greek,
379		Self::Arabic,
380		Self::Hebrew,
381		Self::Cyrillic,
382		Self::L5,
383		Self::Euc_kr,
384		Self::L6,
385		Self::Gbk,
386		Self::L1,
387		Self::L6,
388		Self::Dos_874,
389		Self::Iso885913,
390		Self::Iso885914,
391		Self::L9,
392		Self::L2,
393		Self::L3,
394		Self::L4,
395		Self::Cyrillic,
396		Self::Arabic,
397		Self::Greek,
398		Self::Hebrew,
399		Self::L5,
400		Self::L1,
401		Self::L6,
402		Self::Dos_874,
403		Self::Iso885913,
404		Self::Iso885914,
405		Self::L9,
406		Self::L2,
407		Self::L3,
408		Self::L4,
409		Self::Cyrillic,
410		Self::Arabic,
411		Self::Greek,
412		Self::Hebrew,
413		Self::L5,
414		Self::L1,
415		Self::L9,
416		Self::L1,
417		Self::L2,
418		Self::L2,
419		Self::L3,
420		Self::L3,
421		Self::L4,
422		Self::L4,
423		Self::Cyrillic,
424		Self::Cyrillic,
425		Self::Arabic,
426		Self::Arabic,
427		Self::Greek,
428		Self::Greek,
429		Self::Hebrew,
430		Self::Hebrew,
431		Self::L5,
432		Self::L5,
433		Self::Koi,
434		Self::Koi,
435		Self::Koi,
436		Self::Koi8_u,
437		Self::Koi8_u,
438		Self::Koi,
439		Self::Euc_kr,
440		Self::Euc_kr,
441		Self::Euc_kr,
442		Self::Euc_kr,
443		Self::Euc_kr,
444		Self::L1,
445		Self::L2,
446		Self::L3,
447		Self::L4,
448		Self::L5,
449		Self::L6,
450		Self::L9,
451		Self::L1,
452		Self::L2,
453		Self::L3,
454		Self::L4,
455		Self::L5,
456		Self::L6,
457		Self::Logical,
458		Self::Mac,
459		Self::Mac,
460		Self::Sjis,
461		Self::Sjis,
462		Self::Hz_gb_2312,
463		Self::Sjis,
464		Self::Sjis,
465		Self::Sjis,
466		Self::Greek,
467		Self::Dos_874,
468		Self::Unknown,
469		Self::Unknown,
470		Self::Unknown,
471		Self::Unknown,
472		Self::Unknown,
473		Self::Unknown,
474		Self::Unknown,
475		Self::L1,
476		Self::Unknown,
477		Self::Unknown,
478		Self::Unknown,
479		Self::Unknown,
480		Self::Unknown,
481		Self::Hebrew,
482		Self::Cp1250,
483		Self::Cp1251,
484		Self::L1,
485		Self::Cp1253,
486		Self::L5,
487		Self::Cp1255,
488		Self::Cp1256,
489		Self::Cp1257,
490		Self::Cp1258,
491		Self::Sjis,
492		Self::Dos_874,
493		Self::Euc_kr,
494		Self::Cp1250,
495		Self::Cp1251,
496		Self::L1,
497		Self::Cp1253,
498		Self::L5,
499		Self::Cp1255,
500		Self::Cp1256,
501		Self::Cp1257,
502		Self::Cp1258,
503		Self::Euc_jp,
504		Self::Gbk,
505		Self::X_mac_cyrillic,
506		Self::Mac,
507		Self::X_mac_cyrillic,
508		Self::Sjis,
509		Self::Unknown,
510		Self::X_user_defined,
511		Self::Big5,
512	];
513
514	/// Gives the label for `label`, as [get an encoding] does: remove leading and trailing ASCII
515	/// whitespace, then match ASCII case-insensitively.
516	///
517	/// [get an encoding]: https://encoding.spec.whatwg.org/#concept-encoding-get
518	///
519	/// ```rust
520	/// # use css_ast::{AtomSet, EncodingLabel};
521	/// assert_eq!(EncodingLabel::from_label(" \tGBK\n").to_str(), "gbk");
522	/// assert_eq!(EncodingLabel::from_label("not-a-charset"), EncodingLabel::Unknown);
523	/// ```
524	pub fn from_label(label: &str) -> Self {
525		Self::from_str(label.trim_matches(|c| matches!(c, '\t' | '\n' | '\x0C' | '\r' | ' ')))
526	}
527
528	/// Gives the shortest label naming the same encoding, or itself when it is already the shortest.
529	///
530	/// Gives [EncodingLabel::Unknown] for a label a `@charset` rule gains nothing from: an unknown
531	/// label, and the labels of encodings that [determining the fallback encoding] resolves to UTF-8.
532	/// Such a rule has no effect and you can remove it.
533	///
534	/// [determining the fallback encoding]: https://drafts.csswg.org/css-syntax-3/#determine-the-fallback-encoding
535	///
536	/// ```rust
537	/// # use css_ast::{AtomSet, EncodingLabel};
538	/// assert_eq!(EncodingLabel::from_label("ISO-8859-1").compact().to_str(), "l1");
539	/// assert_eq!(EncodingLabel::from_label("gbk").compact().to_str(), "gbk");
540	/// assert_eq!(EncodingLabel::from_label("utf-16").compact(), EncodingLabel::Unknown);
541	/// ```
542	pub fn compact(self) -> Self {
543		Self::COMPACT[self as usize]
544	}
545}
546
547#[cfg(test)]
548mod tests {
549	use super::{AtomSet, EncodingLabel};
550
551	/// Every label, in [EncodingLabel] declaration order.
552	const ALL_LABELS: [&str; 228] = [
553		"866",
554		"ansi_x3.4-1968",
555		"arabic",
556		"ascii",
557		"asmo-708",
558		"big5",
559		"big5-hkscs",
560		"chinese",
561		"cn-big5",
562		"cp1250",
563		"cp1251",
564		"cp1252",
565		"cp1253",
566		"cp1254",
567		"cp1255",
568		"cp1256",
569		"cp1257",
570		"cp1258",
571		"cp819",
572		"cp866",
573		"csbig5",
574		"cseuckr",
575		"cseucpkdfmtjapanese",
576		"csgb2312",
577		"csibm866",
578		"csiso2022jp",
579		"csiso2022kr",
580		"csiso58gb231280",
581		"csiso88596e",
582		"csiso88596i",
583		"csiso88598e",
584		"csiso88598i",
585		"csisolatin1",
586		"csisolatin2",
587		"csisolatin3",
588		"csisolatin4",
589		"csisolatin5",
590		"csisolatin6",
591		"csisolatin9",
592		"csisolatinarabic",
593		"csisolatincyrillic",
594		"csisolatingreek",
595		"csisolatinhebrew",
596		"cskoi8r",
597		"csksc56011987",
598		"csmacintosh",
599		"csshiftjis",
600		"csunicode",
601		"cyrillic",
602		"dos-874",
603		"ecma-114",
604		"ecma-118",
605		"elot_928",
606		"euc-jp",
607		"euc-kr",
608		"gb18030",
609		"gb2312",
610		"gb_2312",
611		"gb_2312-80",
612		"gbk",
613		"greek",
614		"greek8",
615		"hebrew",
616		"hz-gb-2312",
617		"ibm819",
618		"ibm866",
619		"iso-10646-ucs-2",
620		"iso-2022-cn",
621		"iso-2022-cn-ext",
622		"iso-2022-jp",
623		"iso-2022-kr",
624		"iso-8859-1",
625		"iso-8859-10",
626		"iso-8859-11",
627		"iso-8859-13",
628		"iso-8859-14",
629		"iso-8859-15",
630		"iso-8859-16",
631		"iso-8859-2",
632		"iso-8859-3",
633		"iso-8859-4",
634		"iso-8859-5",
635		"iso-8859-6",
636		"iso-8859-6-e",
637		"iso-8859-6-i",
638		"iso-8859-7",
639		"iso-8859-8",
640		"iso-8859-8-e",
641		"iso-8859-8-i",
642		"iso-8859-9",
643		"iso-ir-100",
644		"iso-ir-101",
645		"iso-ir-109",
646		"iso-ir-110",
647		"iso-ir-126",
648		"iso-ir-127",
649		"iso-ir-138",
650		"iso-ir-144",
651		"iso-ir-148",
652		"iso-ir-149",
653		"iso-ir-157",
654		"iso-ir-58",
655		"iso8859-1",
656		"iso8859-10",
657		"iso8859-11",
658		"iso8859-13",
659		"iso8859-14",
660		"iso8859-15",
661		"iso8859-2",
662		"iso8859-3",
663		"iso8859-4",
664		"iso8859-5",
665		"iso8859-6",
666		"iso8859-7",
667		"iso8859-8",
668		"iso8859-9",
669		"iso88591",
670		"iso885910",
671		"iso885911",
672		"iso885913",
673		"iso885914",
674		"iso885915",
675		"iso88592",
676		"iso88593",
677		"iso88594",
678		"iso88595",
679		"iso88596",
680		"iso88597",
681		"iso88598",
682		"iso88599",
683		"iso_8859-1",
684		"iso_8859-15",
685		"iso_8859-1:1987",
686		"iso_8859-2",
687		"iso_8859-2:1987",
688		"iso_8859-3",
689		"iso_8859-3:1988",
690		"iso_8859-4",
691		"iso_8859-4:1988",
692		"iso_8859-5",
693		"iso_8859-5:1988",
694		"iso_8859-6",
695		"iso_8859-6:1987",
696		"iso_8859-7",
697		"iso_8859-7:1987",
698		"iso_8859-8",
699		"iso_8859-8:1988",
700		"iso_8859-9",
701		"iso_8859-9:1989",
702		"koi",
703		"koi8",
704		"koi8-r",
705		"koi8-ru",
706		"koi8-u",
707		"koi8_r",
708		"korean",
709		"ks_c_5601-1987",
710		"ks_c_5601-1989",
711		"ksc5601",
712		"ksc_5601",
713		"l1",
714		"l2",
715		"l3",
716		"l4",
717		"l5",
718		"l6",
719		"l9",
720		"latin1",
721		"latin2",
722		"latin3",
723		"latin4",
724		"latin5",
725		"latin6",
726		"logical",
727		"mac",
728		"macintosh",
729		"ms932",
730		"ms_kanji",
731		"replacement",
732		"shift-jis",
733		"shift_jis",
734		"sjis",
735		"sun_eu_greek",
736		"tis-620",
737		"ucs-2",
738		"unicode",
739		"unicode-1-1-utf-8",
740		"unicode11utf8",
741		"unicode20utf8",
742		"unicodefeff",
743		"unicodefffe",
744		"us-ascii",
745		"utf-16",
746		"utf-16be",
747		"utf-16le",
748		"utf-8",
749		"utf8",
750		"visual",
751		"windows-1250",
752		"windows-1251",
753		"windows-1252",
754		"windows-1253",
755		"windows-1254",
756		"windows-1255",
757		"windows-1256",
758		"windows-1257",
759		"windows-1258",
760		"windows-31j",
761		"windows-874",
762		"windows-949",
763		"x-cp1250",
764		"x-cp1251",
765		"x-cp1252",
766		"x-cp1253",
767		"x-cp1254",
768		"x-cp1255",
769		"x-cp1256",
770		"x-cp1257",
771		"x-cp1258",
772		"x-euc-jp",
773		"x-gbk",
774		"x-mac-cyrillic",
775		"x-mac-roman",
776		"x-mac-ukrainian",
777		"x-sjis",
778		"x-unicode20utf8",
779		"x-user-defined",
780		"x-x-big5",
781	];
782
783	#[test]
784	fn every_label_resolves_to_its_own_variant() {
785		for (i, label) in ALL_LABELS.iter().enumerate() {
786			assert_eq!(
787				EncodingLabel::from_label(label).as_bits() as usize,
788				i + 1,
789				"{label} did not resolve to its own variant",
790			);
791		}
792	}
793
794	#[test]
795	fn compact_is_idempotent() {
796		for label in EncodingLabel::COMPACT {
797			assert_eq!(label.compact(), label, "{} is not its own shortest label", label.to_str());
798		}
799	}
800
801	#[test]
802	fn compact_never_lengthens_a_label() {
803		for label in ALL_LABELS.iter().map(|l| EncodingLabel::from_label(l)) {
804			let compact = label.compact();
805			if compact != EncodingLabel::Unknown {
806				assert!(compact.len() <= label.len(), "{} is longer than {}", compact.to_str(), label.to_str());
807			}
808		}
809	}
810
811	#[test]
812	fn shortens_windows_1252_aliases() {
813		assert_eq!(EncodingLabel::from_label("ISO-8859-1").compact().to_str(), "l1");
814		assert_eq!(EncodingLabel::from_label("us-ascii").compact().to_str(), "l1");
815		assert_eq!(EncodingLabel::from_label("l1").compact().to_str(), "l1");
816	}
817
818	#[test]
819	fn separators_are_significant() {
820		assert_eq!(EncodingLabel::from_label("iso_8859-15").compact().to_str(), "l9");
821		assert_eq!(EncodingLabel::from_label("iso8859-15").compact().to_str(), "l9");
822		assert_eq!(EncodingLabel::from_label("iso-8859-15").compact().to_str(), "l9");
823		assert_eq!(EncodingLabel::from_label("iso-8859_15"), EncodingLabel::Unknown);
824	}
825
826	#[test]
827	fn drops_utf8_and_utf16_labels() {
828		assert_eq!(EncodingLabel::from_label("UTF-8").compact(), EncodingLabel::Unknown);
829		assert_eq!(EncodingLabel::from_label("utf-16").compact(), EncodingLabel::Unknown);
830		assert_eq!(EncodingLabel::from_label("utf-16be").compact(), EncodingLabel::Unknown);
831		assert_eq!(EncodingLabel::from_label("unicode-1-1-utf-8").compact(), EncodingLabel::Unknown);
832	}
833
834	#[test]
835	fn drops_unknown_labels() {
836		assert_eq!(EncodingLabel::from_label("not-a-charset"), EncodingLabel::Unknown);
837		assert_eq!(EncodingLabel::from_label(""), EncodingLabel::Unknown);
838		assert_eq!(EncodingLabel::from_label("a-label-far-longer-than-any-real-one"), EncodingLabel::Unknown);
839	}
840}
css_ast/encoding_label.rs

css_ast/
encoding_label.rs
