275 lines
8.8 KiB
Rust
275 lines
8.8 KiB
Rust
//! Localización (L10n).
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//!
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//! PageTop usa el conjunto de especificaciones [Fluent](https://www.projectfluent.org/) para la
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//! localización de aplicaciones.
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//!
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//! # Sintaxis Fluent (FTL)
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//!
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//! El formato utilizado para describir los recursos de traducción utilizados por Fluent se llama
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//! [FTL](https://www.projectfluent.org/fluent/guide/). FTL está diseñado para ser fácil de leer,
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//! pero al mismo tiempo permite representar conceptos complejos del lenguaje natural para tratar
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//! género, plurales, conjugaciones, y otros.
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//!
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//!
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//! # Recursos Fluent
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//!
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//! PageTop usa [fluent-templates](https://docs.rs/fluent-templates/) para integrar los recursos de
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//! localización en el binario de la aplicación. El siguiente ejemplo agrupa archivos y subcarpetas
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//! de *src/locale* que tienen un [Identificador de Idioma Unicode](https://docs.rs/unic-langid/)
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//! válido y los asigna a su identificador correspondiente:
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//!
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//! ```text
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//! src/locale/
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//! ├── common.ftl
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//! ├── en-US/
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//! │ ├── default.ftl
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//! │ └── main.ftl
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//! ├── es-ES/
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//! │ ├── default.ftl
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//! │ └── main.ftl
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//! ├── es-MX/
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//! │ ├── default.ftl
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//! │ └── main.ftl
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//! └── fr/
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//! ├── default.ftl
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//! └── main.ftl
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//! ```
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//!
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//! Ejemplo de un archivo *src/locale/en-US/main.ftl*:
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//!
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//! ```text
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//! hello-world = Hello world!
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//! hello-user = Hello, {$userName}!
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//! shared-photos =
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//! {$userName} {$photoCount ->
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//! [one] added a new photo
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//! *[other] added {$photoCount} new photos
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//! } of {$userGender ->
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//! [male] him and his family
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//! [female] her and her family
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//! *[other] the family
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//! }.
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//! ```
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//!
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//! Ejemplo del archivo equivalente *src/locale/es-ES/main.ftl*:
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//!
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//! ```text
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//! hello-world = Hola mundo!
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//! hello-user = ¡Hola, {$userName}!
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//! shared-photos =
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//! {$userName} {$photoCount ->
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//! [one] ha añadido una nueva foto
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//! *[other] ha añadido {$photoCount} nuevas fotos
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//! } de {$userGender ->
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//! [male] él y su familia
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//! [female] ella y su familia
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//! *[other] la familia
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//! }.
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//! ```
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//!
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//! # Cómo aplicar la localización en tu código
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//!
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//! Una vez hayas creado tu directorio de recursos FTL usa la macro
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//! [`static_locales!`](crate::static_locales) para integrarlos en tu módulo o aplicación.
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//! si tus recursos se encuentran en el directorio `"src/locale"` bastará con declarar:
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//!
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//! ```
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//! use pagetop::prelude::*;
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//!
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//! static_locales!(LOCALES_SAMPLE);
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//! ```
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//!
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//! Y si están en otro directorio, entonces puedes usar:
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//!
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//! ```
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//! use pagetop::prelude::*;
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//!
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//! static_locales!(LOCALES_SAMPLE in "path/to/locale");
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//! ```
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use crate::html::{Markup, PreEscaped};
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use crate::{config, kv, LazyStatic, LOCALES_PAGETOP};
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pub use fluent_templates;
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pub use unic_langid::LanguageIdentifier;
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pub(crate) use fluent_templates::Loader;
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pub(crate) use fluent_templates::StaticLoader as Locales;
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use unic_langid::langid;
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use std::collections::HashMap;
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use std::fmt;
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const LANGUAGE_SET_FAILURE: &str = "language_set_failure";
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static LANGUAGES: LazyStatic<HashMap<String, (LanguageIdentifier, &str)>> = LazyStatic::new(|| {
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kv![
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"en" => (langid!("en-US"), "English"),
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"en-GB" => (langid!("en-GB"), "English (British)"),
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"en-US" => (langid!("en-US"), "English (United States)"),
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"es" => (langid!("es-ES"), "Spanish"),
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"es-ES" => (langid!("es-ES"), "Spanish (Spain)"),
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]
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});
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pub static LANGID_FALLBACK: LazyStatic<LanguageIdentifier> = LazyStatic::new(|| langid!("en-US"));
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/// Almacena el Identificador de Idioma Unicode
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/// ([Unicode Language Identifier](https://unicode.org/reports/tr35/tr35.html#Unicode_language_identifier))
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/// global para la aplicación a partir de `SETTINGS.app.language`.
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pub static LANGID: LazyStatic<&LanguageIdentifier> = LazyStatic::new(|| {
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langid_for(config::SETTINGS.app.language.as_str()).unwrap_or(&LANGID_FALLBACK)
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});
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pub fn langid_for(language: impl Into<String>) -> Result<&'static LanguageIdentifier, String> {
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let language = language.into();
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match LANGUAGES.get(language.as_str()) {
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Some((langid, _)) => Ok(langid),
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None => {
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if language.is_empty() {
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Ok(&LANGID_FALLBACK)
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} else {
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Err(format!(
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"{} Unicode Language Identifier \"{}\" is not accepted. {}",
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"Failed to set language.",
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config::SETTINGS.app.language,
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"Using \"en-US\", check the settings file"
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))
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}
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}
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}
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}
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#[macro_export]
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/// Define un conjunto de elementos de localización y textos locales de traducción.
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macro_rules! static_locales {
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( $LOCALES:ident $(, $core_locales:literal)? ) => {
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$crate::locale::fluent_templates::static_loader! {
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static $LOCALES = {
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locales: "src/locale",
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$( core_locales: $core_locales, )?
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fallback_language: "en-US",
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// Elimina las marcas Unicode que delimitan los argumentos.
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customise: |bundle| bundle.set_use_isolating(false),
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};
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}
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};
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( $LOCALES:ident in $dir_locales:literal $(, $core_locales:literal)? ) => {
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$crate::locale::fluent_templates::static_loader! {
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static $LOCALES = {
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locales: $dir_locales,
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$( core_locales: $core_locales, )?
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fallback_language: "en-US",
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// Elimina las marcas Unicode que delimitan los argumentos.
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customise: |bundle| bundle.set_use_isolating(false),
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};
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}
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};
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}
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#[derive(Default)]
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enum L10nOp {
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#[default]
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None,
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Text(String),
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Translate(String),
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}
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#[derive(Default)]
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pub struct L10n {
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op: L10nOp,
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locales: Option<&'static Locales>,
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args: HashMap<String, String>,
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}
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impl L10n {
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pub fn n(text: impl Into<String>) -> Self {
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let text = text.into();
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L10n {
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op: if text.trim().is_empty() {
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L10nOp::None
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} else {
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L10nOp::Text(text)
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},
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..Default::default()
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}
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}
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pub fn l(key: impl Into<String>) -> Self {
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L10n {
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op: L10nOp::Translate(key.into()),
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locales: Some(&LOCALES_PAGETOP),
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..Default::default()
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}
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}
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pub fn t(key: impl Into<String>, locales: &'static Locales) -> Self {
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L10n {
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op: L10nOp::Translate(key.into()),
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locales: Some(locales),
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..Default::default()
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}
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}
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pub fn with_arg(mut self, arg: impl Into<String>, value: impl Into<String>) -> Self {
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self.args.insert(arg.into(), value.into());
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self
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}
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pub fn using(&self, langid: &LanguageIdentifier) -> Option<String> {
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match &self.op {
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L10nOp::None => None,
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L10nOp::Text(text) => Some(text.to_owned()),
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L10nOp::Translate(key) => match self.locales {
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Some(locales) => locales.lookup_with_args(
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langid,
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key,
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&self
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.args
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.iter()
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.fold(HashMap::new(), |mut args, (key, value)| {
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args.insert(key.to_string(), value.to_owned().into());
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args
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}),
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),
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None => None,
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},
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}
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}
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pub fn escaped(&self, langid: &LanguageIdentifier) -> Markup {
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PreEscaped(self.using(langid).unwrap_or_default())
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}
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}
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#[rustfmt::skip]
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impl fmt::Display for L10n {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match &self.op {
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L10nOp::None => write!(f, ""),
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L10nOp::Text(text) => write!(f, "{text}"),
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L10nOp::Translate(key) => write!(f, "{}", match self.locales {
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Some(locales) => locales
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.lookup_with_args(
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match key.as_str() {
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LANGUAGE_SET_FAILURE => &LANGID_FALLBACK,
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_ => &LANGID,
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},
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key,
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&self
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.args
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.iter()
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.fold(HashMap::new(), |mut args, (key, value)| {
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args.insert(key.to_string(), value.to_owned().into());
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args
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}),
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)
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.unwrap_or(key.to_owned()),
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None => key.to_owned(),
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}),
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}
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}
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}
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