ic-query 0.10.3

Internet Computer query library for NNS, SNS, ICRC, and related public network metadata
Documentation 
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//! Module: text_search
//!
//! Responsibility: shared helpers for small human-text filters.
//! Does not own: command parsing, report filtering, or locale-sensitive search.
//! Boundary: provides Unicode-aware case-insensitive matching for view predicates.

pub fn optional_text_contains_case_insensitive(value: Option<&str>, query: &str) -> bool {
    value.is_some_and(|value| text_contains_case_insensitive(value, query))
}

fn text_contains_case_insensitive(value: &str, query: &str) -> bool {
    query.is_empty() || value.to_lowercase().contains(&query.to_lowercase())
}

#[cfg(test)]
mod tests {
    use super::optional_text_contains_case_insensitive;

    #[test]
    fn optional_text_contains_case_insensitive_matches_unicode_text() {
        assert!(optional_text_contains_case_insensitive(
            Some("Subnet Upgrade"),
            "subnet"
        ));
        assert!(optional_text_contains_case_insensitive(
            Some("Subnet Upgrade"),
            "UPGRADE"
        ));
        assert!(optional_text_contains_case_insensitive(
            Some("RÉSUMÉ proposal"),
            "résumé"
        ));
        assert!(!optional_text_contains_case_insensitive(
            Some("Node Provider"),
            "subnet"
        ));
        assert!(!optional_text_contains_case_insensitive(None, "subnet"));
    }
}