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//! Filter mode utilities for searchable widgets
//!
//! Provides a shared `FilterMode` enum used by combobox, autocomplete, and other
//! widgets that need to filter items based on user input.
/// Filter mode for matching items against user input
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
pub enum FilterMode {
/// Fuzzy matching (typo tolerant, e.g., "hw" matches "Hello World")
#[default]
Fuzzy,
/// Prefix matching (starts with, e.g., "Hel" matches "Hello")
Prefix,
/// Contains matching (substring anywhere)
Contains,
/// Exact matching (case-insensitive)
Exact,
/// No filtering (show all items)
None,
}
impl FilterMode {
/// Check if a text matches the pattern using this filter mode
///
/// Uses Unicode-aware case folding for non-ASCII characters,
/// ensuring proper matching for text like "É" vs "é".
pub fn matches(&self, text: &str, pattern: &str) -> bool {
if pattern.is_empty() {
return true;
}
match self {
FilterMode::Fuzzy => {
// Simple fuzzy: all pattern chars appear in order
// Use Unicode-aware case comparison for non-ASCII
let mut pattern_chars = pattern.chars().peekable();
for ch in text.chars() {
if let Some(&p) = pattern_chars.peek() {
// Try ASCII case compare first (fast path)
if ch.eq_ignore_ascii_case(&p) {
pattern_chars.next();
} else {
// Fallback to Unicode case folding for non-ASCII
let ch_lower = ch.to_lowercase().next().unwrap_or(ch);
let p_lower = p.to_lowercase().next().unwrap_or(p);
if ch_lower == p_lower {
pattern_chars.next();
}
}
}
}
pattern_chars.peek().is_none()
}
FilterMode::Prefix => {
// Use Unicode to_lowercase for proper case-insensitive comparison
let text_lower = text.to_lowercase();
let pattern_lower = pattern.to_lowercase();
text_lower.starts_with(&pattern_lower)
}
FilterMode::Contains => {
// Use Unicode to_lowercase for proper case-insensitive comparison
let text_lower = text.to_lowercase();
let pattern_lower = pattern.to_lowercase();
text_lower.contains(&pattern_lower)
}
FilterMode::Exact => {
// Use Unicode to_lowercase for proper case-insensitive comparison
let text_lower = text.to_lowercase();
let pattern_lower = pattern.to_lowercase();
text_lower == pattern_lower
}
FilterMode::None => true,
}
}
}