diff options
Diffstat (limited to 'pango/pango-script.c')
| -rw-r--r-- | pango/pango-script.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/pango/pango-script.c b/pango/pango-script.c index 39a95641..10acfc90 100644 --- a/pango/pango-script.c +++ b/pango/pango-script.c @@ -341,3 +341,175 @@ pango_script_iter_next (PangoScriptIter *iter) return TRUE; } + +/********************************************************** + * End of code from ICU + **********************************************************/ + +#include "pango-script-lang-table.h" + +static int +script_for_lang_compare (gconstpointer key, + gconstpointer member) +{ + const char *lang = key; + const PangoScriptForLang *script_for_lang = member; + + return strcmp (lang, + pango_language_to_string (script_for_lang->lang)); +} + +/** + * pango_language_includes_script: + * @language: a PangoLanguage + * @script: a #PangoScript + * + * Determines if @script is one of the scripts used to + * write @language. The returned value is conservative; + * if nothing is known about the language tag @language, + * %TRUE will be returned, since, as far as Pango knows, + * @script might be used to write @language. + * + * This routine is used in Pango's itemization process when + * determining if a supplied language tag is relevant to + * a particular section of text. It probably is not useful for + * applications in most circumstances. + * + * Return value: %TRUE if @script is one of the scripts used + * to write @language, or if nothing is known about @language. + **/ +gboolean +pango_language_includes_script (PangoLanguage *language, + PangoScript script) +{ + PangoScriptForLang *script_for_lang; + int j; + + g_return_val_if_fail (language != NULL, FALSE); + + /* This bsearch could be optimized to occur only once if + * we store the pointer to the PangoScriptForLang in the + * same block as the string value for the PangoLanguage. + */ + script_for_lang = bsearch (pango_language_to_string (language), + pango_script_for_lang, + sizeof (PangoScriptForLang), + G_N_ELEMENTS (pango_script_for_lang), + script_for_lang_compare); + if (!script_for_lang) + return TRUE; + + for (j = 0; j < G_N_ELEMENTS (script_for_lang->scripts); j++) + if (script_for_lang->scripts[j] == script) + return TRUE; + + return FALSE; +} + +/** + * pango_script_get_sample_language: + * @script: a #PangoScript + * + * Given a script, finds a language tag that is reasonably + * representative of that script. This will usually be the + * most widely spoken or used language written in that script: + * for instance, the sample language for %PANGO_SCRIPT_CYRILLIC + * is <literal>ru</literal> (Russian), the sample lanugage + * for %PANGO_SCRIPT_ARABIC is <literal>ar</literal>. + * + * For some + * scripts, no sample language will be returned because there + * is no language that is sufficiently representative. The best + * example of this is %PANGO_SCRIPT_HAN, where various different + * variants of written Chinese, Japanese, and Korean all use + * significantly different sets of Han characters and forms + * of shared characters. No sample language can be provided + * for many historical scripts as well. + * + * Return value: a #PangoLanguage that is representative + * of the script, or %NULL if no such language exists. + **/ +PangoLanguage * +pango_script_get_sample_language (PangoScript script) +{ + /* Note that in the following, we want + * pango_language_includes_script() for the sample language + * to include the script, so alternate orthographies + * (Shavian for English, Osmanya for Somali, etc), typically + * have no sample language + */ + const char sample_languages[][4] = { + "", /* PANGO_SCRIPT_COMMON */ + "", /* PANGO_SCRIPT_INHERITED */ + "ar", /* PANGO_SCRIPT_ARABIC */ + "hy", /* PANGO_SCRIPT_ARMENIAN */ + "bn", /* PANGO_SCRIPT_BENGALI */ + /* Used primarily in Taiwan, but not part of the standard + * zh-tw orthography */ + "", /* PANGO_SCRIPT_BOPOMOFO */ + "chr", /* PANGO_SCRIPT_CHEROKEE */ + "cop", /* PANGO_SCRIPT_COPTIC */ + "ru", /* PANGO_SCRIPT_CYRILLIC */ + /* Deseret was used to write English */ + "", /* PANGO_SCRIPT_DESERET */ + "hi", /* PANGO_SCRIPT_DEVANAGARI */ + "am", /* PANGO_SCRIPT_ETHIOPIC */ + "ka", /* PANGO_SCRIPT_GEORGIAN */ + "", /* PANGO_SCRIPT_GOTHIC */ + "el", /* PANGO_SCRIPT_GREEK */ + "gu", /* PANGO_SCRIPT_GUJARATI */ + "pa", /* PANGO_SCRIPT_GURMUKHI */ + "", /* PANGO_SCRIPT_HAN */ + "ko", /* PANGO_SCRIPT_HANGUL */ + "he", /* PANGO_SCRIPT_HEBREW */ + "ja", /* PANGO_SCRIPT_HIRAGANA */ + "kn", /* PANGO_SCRIPT_KANNADA */ + "ja", /* PANGO_SCRIPT_KATAKANA */ + "km", /* PANGO_SCRIPT_KHMER */ + "lo", /* PANGO_SCRIPT_LAO */ + "en", /* PANGO_SCRIPT_LATIN */ + "ml", /* PANGO_SCRIPT_MALAYALAM */ + "mn", /* PANGO_SCRIPT_MONGOLIAN */ + "my", /* PANGO_SCRIPT_MYANMAR */ + /* Ogham was used to write old Irish */ + "", /* PANGO_SCRIPT_OGHAM */ + "", /* PANGO_SCRIPT_OLD_ITALIC */ + "or", /* PANGO_SCRIPT_ORIYA */ + "", /* PANGO_SCRIPT_RUNIC */ + "si", /* PANGO_SCRIPT_SINHALA */ + "syr", /* PANGO_SCRIPT_SYRIAC */ + "ta", /* PANGO_SCRIPT_TAMIL */ + "te", /* PANGO_SCRIPT_TELUGU */ + "dv", /* PANGO_SCRIPT_THAANA */ + "th", /* PANGO_SCRIPT_THAI */ + "bo", /* PANGO_SCRIPT_TIBETAN */ + "iu", /* PANGO_SCRIPT_CANADIAN_ABORIGINAL */ + "", /* PANGO_SCRIPT_YI */ + "tl", /* PANGO_SCRIPT_TAGALOG */ + /* There are no ISO-636 language codes for the following + * Phillipino languages/scripts */ + "", /* PANGO_SCRIPT_HANUNOO */ + "", /* PANGO_SCRIPT_BUHID */ + "", /* PANGO_SCRIPT_TAGBANWA */ + + "", /* PANGO_SCRIPT_BRAILLE */ + "", /* PANGO_SCRIPT_CYPRIOT */ + "", /* PANGO_SCRIPT_LIMBU */ + /* Used for Somali (so) in the past */ + "", /* PANGO_SCRIPT_OSMANYA */ + /* The Shavian alphabet was designed for English */ + "", /* PANGO_SCRIPT_SHAVIAN */ + "", /* PANGO_SCRIPT_LINEAR_B */ + "", /* PANGO_SCRIPT_TAI_LE */ + "uga", /* PANGO_SCRIPT_UGARITIC */ + }; + + g_return_val_if_fail (script >= 0, NULL); + g_return_val_if_fail (script < G_N_ELEMENTS (sample_languages), NULL); + const char *sample_language = sample_languages[script]; + + if (!sample_language[0]) + return NULL; + else + return pango_language_from_string (sample_language); +} |