pango_script_for_unichar ()

PangoScript
pango_script_for_unichar (gunichar ch);

Looks up the PangoScript for a particular character (as defined by Unicode Standard Annex #24). No check is made for ch being a valid Unicode character; if you pass in invalid character, the result is undefined.

As of Pango 1.18, this function simply returns the return value of g_unichar_get_script().

Since: 1.4

pango_script_get_sample_language ()

PangoLanguage *
pango_script_get_sample_language (PangoScript script);

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 ru (Russian), the sample language for PANGO_SCRIPT_ARABIC is ar.

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.

As of 1.18, this function checks the environment variables PANGO_LANGUAGE and LANGUAGE (checked in that order) first. If one of them is set, it is parsed as a list of language tags separated by colons or other separators. This function will return the first language in the parsed list that Pango believes may use script for writing. This last predicate is tested using pango_language_includes_script(). This can be used to control Pango's font selection for non-primary languages. For example, a PANGO_LANGUAGE enviroment variable set to "en:fa" makes Pango choose fonts suitable for Persian (fa) instead of Arabic (ar) when a segment of Arabic text is found in an otherwise non-Arabic text. The same trick can be used to choose a default language for PANGO_SCRIPT_HAN when setting context language is not feasible.

Since: 1.4

pango_script_iter_new ()

PangoScriptIter *
pango_script_iter_new (const char *text,
                       int length);

Create a new PangoScriptIter, used to break a string of Unicode text into runs by Unicode script. No copy is made of text , so the caller needs to make sure it remains valid until the iterator is freed with pango_script_iter_free().

Since: 1.4

pango_script_iter_get_range ()

void
pango_script_iter_get_range (PangoScriptIter *iter,
                             const char **start,
                             const char **end,
                             PangoScript *script);

Gets information about the range to which iter currently points. The range is the set of locations p where *start <= p < *end. (That is, it doesn't include the character stored at *end)

Since: 1.4

pango_script_iter_next ()

gboolean
pango_script_iter_next (PangoScriptIter *iter);

Advances a PangoScriptIter to the next range. If iter is already at the end, it is left unchanged and FALSE is returned.

Since: 1.4

pango_script_iter_free ()

void
pango_script_iter_free (PangoScriptIter *iter);

Frees a PangoScriptIter created with pango_script_iter_new().

Since: 1.4

pango_language_from_string ()

PangoLanguage *
pango_language_from_string (const char *language);

Take a RFC-3066 format language tag as a string and convert it to a PangoLanguage pointer that can be efficiently copied (copy the pointer) and compared with other language tags (compare the pointer.)

This function first canonicalizes the string by converting it to lowercase, mapping '_' to '-', and stripping all characters other than letters and '-'.

Use pango_language_get_default() if you want to get the PangoLanguage for the current locale of the process.

pango_language_to_string ()

const char *
pango_language_to_string (PangoLanguage *language);

Gets the RFC-3066 format string representing the given language tag.

pango_language_matches ()

gboolean
pango_language_matches (PangoLanguage *language,
                        const char *range_list);

Checks if a language tag matches one of the elements in a list of language ranges. A language tag is considered to match a range in the list if the range is '*', the range is exactly the tag, or the range is a prefix of the tag, and the character after it in the tag is '-'.

pango_language_includes_script ()

gboolean
pango_language_includes_script (PangoLanguage *language,
                                PangoScript script);

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.

This function uses pango_language_get_scripts() internally.

Since: 1.4

pango_language_get_scripts ()

const PangoScript *
pango_language_get_scripts (PangoLanguage *language,
                            int *num_scripts);

Determines the scripts used to to write language . If nothing is known about the language tag language , or if language is NULL, then NULL is returned. The list of scripts returned starts with the script that the language uses most and continues to the one it uses least.

The value num_script points at will be set to the number of scripts in the returned array (or zero if NULL is returned).

Most languages use only one script for writing, but there are some that use two (Latin and Cyrillic for example), and a few use three (Japanese for example). Applications should not make any assumptions on the maximum number of scripts returned though, except that it is positive if the return value is not NULL, and it is a small number.

The pango_language_includes_script() function uses this function internally.

Since: 1.22

pango_language_get_default ()

PangoLanguage *
pango_language_get_default (void);

Returns the PangoLanguage for the current locale of the process. Note that this can change over the life of an application.

On Unix systems, this is the return value is derived from setlocale(LC_CTYPE, NULL), and the user can affect this through the environment variables LC_ALL, LC_CTYPE or LANG (checked in that order). The locale string typically is in the form lang_COUNTRY, where lang is an ISO-639 language code, and COUNTRY is an ISO-3166 country code. For instance, sv_FI for Swedish as written in Finland or pt_BR for Portuguese as written in Brazil.

On Windows, the C library does not use any such environment variables, and setting them won't affect the behavior of functions like ctime(). The user sets the locale through the Regional Options in the Control Panel. The C library (in the setlocale() function) does not use country and language codes, but country and language names spelled out in English. However, this function does check the above environment variables, and does return a Unix-style locale string based on either said environment variables or the thread's current locale.

Your application should call setlocale(LC_ALL, ""); for the user settings to take effect. Gtk+ does this in its initialization functions automatically (by calling gtk_set_locale()). See man setlocale for more details.

Since: 1.16

pango_language_get_sample_string ()

const char *
pango_language_get_sample_string (PangoLanguage *language);

Get a string that is representative of the characters needed to render a particular language.

The sample text may be a pangram, but is not necessarily. It is chosen to be demonstrative of normal text in the language, as well as exposing font feature requirements unique to the language. It is suitable for use as sample text in a font selection dialog.

If language is NULL, the default language as found by pango_language_get_default() is used.

If Pango does not have a sample string for language , the classic "The quick brown fox..." is returned. This can be detected by comparing the returned pointer value to that returned for (non-existent) language code "xx". That is, compare to:

1

pango_language_get_sample_string (pango_language_from_string ("xx"))

enum PangoScript

The PangoScript enumeration identifies different writing systems. The values correspond to the names as defined in the Unicode standard. Note that new types may be added in the future. Applications should be ready to handle unknown values. This enumeration is interchangeable with GUnicodeScript. See Unicode Standard Annex 24: Script names.

PANGO_TYPE_SCRIPT

#define PANGO_TYPE_SCRIPT (pango_script_get_type ())

PangoScriptIter

typedef struct _PangoScriptIter PangoScriptIter;

A PangoScriptIter is used to iterate through a string and identify ranges in different scripts.

PangoLanguage

typedef struct _PangoLanguage PangoLanguage;

The PangoLanguage structure is used to represent a language.

PangoLanguage pointers can be efficiently copied and compared with each other.

PANGO_TYPE_LANGUAGE

#define PANGO_TYPE_LANGUAGE (pango_language_get_type ())

The GObject type for PangoLanguage.