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pub mod errors; pub mod parser; pub mod subtags; use crate::errors::LanguageIdentifierError; use std::borrow::Cow; use std::str::FromStr; #[derive(Default, Debug, PartialEq, Eq, Clone, Hash)] pub struct LanguageIdentifier { language: Option<Cow<'static, str>>, script: Option<Cow<'static, str>>, region: Option<Cow<'static, str>>, variants: Vec<Cow<'static, str>>, } impl LanguageIdentifier { pub fn from_parts<S: AsRef<str>>( language: Option<S>, script: Option<S>, region: Option<S>, variants: Option<&[S]>, ) -> Result<Self, LanguageIdentifierError> { let language = if let Some(subtag) = language { subtags::parse_language_subtag(subtag.as_ref())? } else { None }; let script = if let Some(subtag) = script { Some(subtags::parse_script_subtag(subtag.as_ref())?) } else { None }; let region = if let Some(subtag) = region { Some(subtags::parse_region_subtag(subtag.as_ref())?) } else { None }; let mut variants_field = vec![]; if let Some(variants) = variants { for variant in variants { variants_field.push(subtags::parse_variant_subtag(variant.as_ref())?); } variants_field.sort(); } Ok(Self { language, script, region, variants: variants_field, }) } pub fn from_parts_unchecked( language: Option<&'static str>, script: Option<&'static str>, region: Option<&'static str>, variants: Option<&[&'static str]>, ) -> Self { Self { language: language.map(|l| l.into()), script: script.map(|s| s.into()), region: region.map(|r| r.into()), variants: variants.map_or(vec![], |v| { v.iter() .map(|v| -> Cow<'static, str> { Cow::Borrowed(v) }) .collect() }), } } pub fn matches<O: AsRef<Self>>( &self, other: &O, self_as_range: bool, other_as_range: bool, ) -> bool { let other = other.as_ref(); subtag_matches( &self.language, &other.language, self_as_range, other_as_range, ) && subtag_matches(&self.script, &other.script, self_as_range, other_as_range) && subtag_matches(&self.region, &other.region, self_as_range, other_as_range) && subtags_match( &self.variants, &other.variants, self_as_range, other_as_range, ) } pub fn get_language(&self) -> &str { self.language.as_ref().map(|s| s.as_ref()).unwrap_or("und") } pub fn set_language(&mut self, language: Option<&str>) -> Result<(), LanguageIdentifierError> { self.language = if let Some(lang) = language { subtags::parse_language_subtag(lang)? } else { None }; Ok(()) } pub fn get_script(&self) -> Option<&str> { self.script.as_ref().map(|s| s.as_ref()) } pub fn set_script(&mut self, script: Option<&str>) -> Result<(), LanguageIdentifierError> { self.script = if let Some(script) = script { Some(subtags::parse_script_subtag(script)?) } else { None }; Ok(()) } pub fn get_region(&self) -> Option<&str> { self.region.as_ref().map(|s| s.as_ref()) } pub fn set_region(&mut self, region: Option<&str>) -> Result<(), LanguageIdentifierError> { self.region = if let Some(region) = region { Some(subtags::parse_region_subtag(region)?) } else { None }; Ok(()) } pub fn get_variants(&self) -> Vec<&str> { self.variants.iter().map(|s| s.as_ref()).collect() } pub fn set_variants(&mut self, variants: &[&str]) -> Result<(), LanguageIdentifierError> { self.variants.clear(); for variant in variants { self.variants.push(subtags::parse_variant_subtag(variant)?); } self.variants.sort(); Ok(()) } } impl FromStr for LanguageIdentifier { type Err = LanguageIdentifierError; fn from_str(source: &str) -> Result<Self, Self::Err> { parser::parse_language_identifier(source).map_err(std::convert::Into::into) } } impl AsRef<LanguageIdentifier> for LanguageIdentifier { fn as_ref(&self) -> &LanguageIdentifier { self } } impl std::fmt::Display for LanguageIdentifier { fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result { let mut subtags = vec![self.get_language()]; if let Some(script) = self.get_script() { subtags.push(script); } if let Some(region) = self.get_region() { subtags.push(region); } for variant in &self.variants { subtags.push(variant); } f.write_str(&subtags.join("-")) } } fn subtag_matches( subtag1: &Option<Cow<'static, str>>, subtag2: &Option<Cow<'static, str>>, as_range1: bool, as_range2: bool, ) -> bool { (as_range1 && subtag1.is_none()) || (as_range2 && subtag2.is_none()) || subtag1 == subtag2 } fn subtags_match( subtag1: &[Cow<'static, str>], subtag2: &[Cow<'static, str>], as_range1: bool, as_range2: bool, ) -> bool { (as_range1 && subtag1.is_empty()) || (as_range2 && subtag2.is_empty()) || subtag1 == subtag2 } pub fn canonicalize(input: &str) -> Result<String, LanguageIdentifierError> { let lang_id: LanguageIdentifier = input.parse()?; Ok(lang_id.to_string()) }