46 lines
1.8 KiB
Rust
46 lines
1.8 KiB
Rust
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use std::sync::LazyLock;
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use oxigraph::model::Term;
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use oxilangtag::LanguageTag;
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pub const ENGLISH_PRIMARY: &str = "en";
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pub static ENGLISH_OR_UNTAGGED: LazyLock<LanguageCondition> = LazyLock::new(|| {
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LanguageCondition::ExactMatchOrUntagged(LanguageTag::parse(ENGLISH_PRIMARY.to_string()).unwrap())
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});
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pub enum LanguageCondition {
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ExactMatchOnly(LanguageTag<String>),
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ExactMatchOrUntagged(LanguageTag<String>),
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UntaggedOnly,
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AnyOrNone,
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}
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impl LanguageCondition {
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pub fn primary_matches_term(&self, term: &Term) -> bool {
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if let Term::Literal(literal) = term {
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let tag = literal.language()
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.map(LanguageTag::parse_and_normalize)
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.and_then(Result::ok);
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match (tag, self) {
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(Some(language), LanguageCondition::ExactMatchOnly(expectation)) |
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(Some(language), LanguageCondition::ExactMatchOrUntagged(expectation)) => language.primary_language() == expectation.primary_language(),
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(None, LanguageCondition::ExactMatchOrUntagged(_)) => true,
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(None, LanguageCondition::UntaggedOnly) => true,
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(_, LanguageCondition::AnyOrNone) => true,
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_ => false,
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}
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} else {
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false
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}
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}
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pub fn to_filter_expression(&self, var: &str) -> String {
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match self {
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LanguageCondition::ExactMatchOnly(language) => format!(r#"FILTER(langMATCHES(LANG(?{var}), "{language}"))"#),
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LanguageCondition::ExactMatchOrUntagged(language) => format!(r#"FILTER(langMATCHES(LANG(?{var}), "{language}") || !hasLANG(?{var}))"#),
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LanguageCondition::UntaggedOnly => format!("FILTER(!hasLANG(?{var}))"),
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LanguageCondition::AnyOrNone => "".to_string(),
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}
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}
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}
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