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Handle language tags that indicate phonetic IPA transcription 

The BCP-47 registry defines a variant subtag "fonipa" that can be used
in combination with arbitrary other language tags. For example,
"rm-CH-fonipa-sursilv" indicates the Sursilvan dialect of Romansh
as used in Switzerland, transcribed used the International Phonetic
Alphabet.

http://www.iana.org/assignments/language-subtag-registry/language-subtag-registry
This commit is contained in:
Sascha Brawer 2015-06-28 03:29:47 +02:00 committed by Behdad Esfahbod
parent b8811429b6
commit f2ad935e19
2 changed files with 21 additions and 1 deletions
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15
src/hb-ot-tag.cc
View File

@ -733,7 +733,6 @@ static const LangTag ot_languages[] = {
/*{"fuf?", HB_TAG('F','T','A',' ')},*/ /* Futa */ /*{"fuf?", HB_TAG('F','T','A',' ')},*/ /* Futa */
/*{"ar-Syrc?", HB_TAG('G','A','R',' ')},*/ /* Garshuni */ /*{"ar-Syrc?", HB_TAG('G','A','R',' ')},*/ /* Garshuni */
/*{"cfm/rnl?", HB_TAG('H','A','L',' ')},*/ /* Halam */ /*{"cfm/rnl?", HB_TAG('H','A','L',' ')},*/ /* Halam */
/*{"fonipa", HB_TAG('I','P','P','H')},*/ /* Phonetic transcription—IPA conventions */
/*{"ga-Latg?/Latg?", HB_TAG('I','R','T',' ')},*/ /* Irish Traditional */ /*{"ga-Latg?/Latg?", HB_TAG('I','R','T',' ')},*/ /* Irish Traditional */
/*{"krc", HB_TAG('K','A','R',' ')},*/ /* Karachay */ /*{"krc", HB_TAG('K','A','R',' ')},*/ /* Karachay */
/*{"alw?/ktb?", HB_TAG('K','E','B',' ')},*/ /* Kebena */ /*{"alw?/ktb?", HB_TAG('K','E','B',' ')},*/ /* Kebena */
@ -832,6 +831,14 @@ hb_ot_tag_from_language (hb_language_t language)
} }
} }
/*
* The International Phonetic Alphabet is a variant tag in BCP-47,
* which can be applied to any language.
*/
if (strstr (lang_str, "-fonipa")) {
return HB_TAG('I','P','P','H'); /* Phonetic transcription—IPA conventions */
}
/* Find a language matching in the first component */ /* Find a language matching in the first component */
{ {
const LangTag *lang_tag; const LangTag *lang_tag;
@ -901,6 +908,12 @@ hb_ot_tag_to_language (hb_tag_t tag)
} }
} }
/* struct LangTag has only room for 3-letter language tags. */
switch (tag) {
case HB_TAG('I','P','P','H'): /* Phonetic transcription—IPA conventions */
return hb_language_from_string ("und-fonipa", -1);
}
/* Else return a custom language in the form of "x-hbotABCD" */ /* Else return a custom language in the form of "x-hbotABCD" */
{ {
unsigned char buf[11] = "x-hbot"; unsigned char buf[11] = "x-hbot";

7
test/api/test-ot-tag.c
View File

@ -222,6 +222,13 @@ test_ot_tag_language (void)
test_tag_from_language ("XYZ", "xyz"); /* Unknown ISO 639-3 */ test_tag_from_language ("XYZ", "xyz"); /* Unknown ISO 639-3 */
test_tag_from_language ("XYZ", "xyz-qw"); /* Unknown ISO 639-3 */ test_tag_from_language ("XYZ", "xyz-qw"); /* Unknown ISO 639-3 */
/* International Phonetic Alphabet */
test_tag_from_language ("IPPH", "en-fonipa");
test_tag_from_language ("IPPH", "rm-CH-fonipa-sursilv-x-foobar");
test_tag_from_language ("IPPH", "und-fonipa");
test_tag_from_language ("IPPH", "zh-fonipa");
test_tag_to_language ("IPPH", "und-fonipa");
/* Test that x-hbot overrides the base language */ /* Test that x-hbot overrides the base language */
test_tag_from_language ("ABC", "fa-x-hbotabc-zxc"); test_tag_from_language ("ABC", "fa-x-hbotabc-zxc");
test_tag_from_language ("ABC", "fa-ir-x-hbotabc-zxc"); test_tag_from_language ("ABC", "fa-ir-x-hbotabc-zxc");