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// Take a look at the license at the top of the repository in the LICENSE file. use crate::Script; use glib::translate::*; use glib::GString; /// The [`Language`][crate::Language] structure is used to /// represent a language. /// /// [`Language`][crate::Language] pointers can be efficiently /// copied and compared with each other. #[doc(alias = "PangoLanguage")] pub struct Language(*mut ffi::PangoLanguage); #[doc(hidden)] impl<'a> ToGlibPtr<'a, *mut ffi::PangoLanguage> for &'a Language { type Storage = &'a Language; fn to_glib_none(&self) -> Stash<'a, *mut ffi::PangoLanguage, Self> { Stash(self.0, *self) } } #[doc(hidden)] impl<'a> ToGlibPtrMut<'a, *mut ffi::PangoLanguage> for Language { type Storage = &'a mut Self; #[inline] fn to_glib_none_mut(&'a mut self) -> StashMut<'a, *mut ffi::PangoLanguage, Self> { StashMut(self.0, self) } } #[doc(hidden)] impl FromGlibPtrNone<*mut ffi::PangoLanguage> for Language { unsafe fn from_glib_none(ptr: *mut ffi::PangoLanguage) -> Self { assert!(!ptr.is_null()); Self(ptr) } } #[doc(hidden)] impl FromGlibPtrFull<*mut ffi::PangoLanguage> for Language { unsafe fn from_glib_full(ptr: *mut ffi::PangoLanguage) -> Self { assert!(!ptr.is_null()); Self(ptr) } } #[doc(hidden)] impl FromGlibPtrNone<*const ffi::PangoLanguage> for Language { unsafe fn from_glib_none(ptr: *const ffi::PangoLanguage) -> Self { assert!(!ptr.is_null()); Self(ptr as *mut _) } } #[doc(hidden)] impl FromGlibPtrFull<*const ffi::PangoLanguage> for Language { unsafe fn from_glib_full(ptr: *const ffi::PangoLanguage) -> Self { assert!(!ptr.is_null()); Self(ptr as *mut _) } } impl Default for Language { #[doc(alias = "pango_language_get_default")] fn default() -> Self { unsafe { from_glib_full(ffi::pango_language_get_default()) } } } impl Language { /// Take a RFC-3066 format language tag as a string and convert it to a /// [`Language`][crate::Language] 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 [`default()`][Self::default()] if you want to get the [`Language`][crate::Language] for /// the current locale of the process. /// ## `language` /// a string representing a language tag, or [`None`] /// /// # Returns /// /// an opaque pointer to a /// [`Language`][crate::Language] structure, or [`None`] if `language` was /// [`None`]. The returned pointer will be valid forever /// after, and should not be freed. #[doc(alias = "pango_language_from_string")] pub fn from_string(language: &str) -> Self { unsafe { from_glib_full(ffi::pango_language_from_string(language.to_glib_none().0)) } } /// Gets the RFC-3066 format string representing the given language tag. /// /// # Returns /// /// a string representing the language tag. This is owned by /// Pango and should not be freed. #[doc(alias = "pango_language_to_string")] pub fn to_string(&self) -> GString { unsafe { from_glib_none(ffi::pango_language_to_string(self.to_glib_none().0)) } } /// 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 '-'. /// ## `range_list` /// a list of language ranges, separated by ';', ':', /// ',', or space characters. /// Each element must either be '*', or a RFC 3066 language range /// canonicalized as by [`from_string()`][Self::from_string()] /// /// # Returns /// /// [`true`] if a match was found. #[doc(alias = "pango_language_matches")] pub fn matches(&self, range_list: &str) -> bool { unsafe { from_glib(ffi::pango_language_matches( self.to_glib_none().0, range_list.to_glib_none().0, )) } } /// Determines if `script` is one of the scripts used to /// write `self`. The returned value is conservative; /// if nothing is known about the language tag `self`, /// [`true`] will be returned, since, as far as Pango knows, /// `script` might be used to write `self`. /// /// 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 [`scripts()`][Self::scripts()] internally. /// ## `script` /// a [`Script`][crate::Script] /// /// # Returns /// /// [`true`] if `script` is one of the scripts used /// to write `self` or if nothing is known about `self` /// (including the case that `self` is [`None`]), /// [`false`] otherwise. #[doc(alias = "pango_language_includes_script")] pub fn includes_script(&self, script: Script) -> bool { unsafe { from_glib(ffi::pango_language_includes_script( self.to_glib_none().0, script.into_glib(), )) } } /// Determines the scripts used to to write `self`. /// If nothing is known about the language tag `self`, /// or if `self` is [`None`], then [`None`] 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 [`None`] 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 /// [`None`], and it is a small number. /// /// The [`includes_script()`][Self::includes_script()] function uses this function /// internally. /// /// Note: while the return value is declared as PangoScript, the /// returned values are from the GUnicodeScript enumeration, which /// may have more values. Callers need to handle unknown values. /// /// # Returns /// /// An array of /// [`Script`][crate::Script] values, with the number of entries in the array stored /// in `num_scripts`, or [`None`] if Pango does not have any information /// about this particular language tag (also the case if `self` is /// [`None`]). The returned array is owned by Pango and should not be /// modified or freed. #[doc(alias = "get_scripts")] #[doc(alias = "pango_language_get_scripts")] pub fn scripts(&self) -> Vec<Script> { let mut num_scripts = 0; let mut ret = Vec::new(); unsafe { let scripts: *const ffi::PangoScript = ffi::pango_language_get_scripts(self.to_glib_none().0, &mut num_scripts); if num_scripts > 0 { for x in 0..num_scripts { ret.push(from_glib( *(scripts.offset(x as isize) as *const ffi::PangoScript), )); } } ret } } /// 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 `self` is [`None`], the default language as found by /// [`default()`][Self::default()] is used. /// /// If Pango does not have a sample string for `self`, 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: /// `<informalexample>``<programlisting>` /// pango_language_get_sample_string (pango_language_from_string ("xx")) /// `</programlisting>``</informalexample>` /// /// # Returns /// /// the sample string. This value is owned by Pango /// and should not be freed. #[doc(alias = "get_sample_string")] #[doc(alias = "pango_language_get_sample_string")] pub fn sample_string(&self) -> GString { unsafe { from_glib_none(ffi::pango_language_get_sample_string(self.to_glib_none().0)) } } }