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//! Counts the characters in `subject`. /// Counts the characters in `subject`. /// /// # Arguments /// /// * `subject` - The string to count characters. /// /// # Example /// /// ``` /// use voca_rs::*; /// count::count("rain"); /// // => 4 /// count::count("błąd"); /// // => 4 /// use voca_rs::Voca; /// "rain"._count(); /// // => 4 /// ``` pub fn count(subject: &str) -> usize { match subject.len() { 0 => 0, _ => crate::split::chars(subject).len(), } } /// Counts the graphemes in `subject` taking care of surrogate pairs and combining marks. /// /// # Arguments /// /// * `subject` - The string to count graphemes. /// /// # Example /// /// ``` /// use voca_rs::*; /// count::count_graphemes("cafe\u{0301}"); // or "café" /// // => 4 /// count::count_graphemes("b\u{0142}\u{0105}d"); // or "błąd" /// // => 4 /// count::count_graphemes("a̐éö̲"); /// // => 3 /// count::count_graphemes("rain"); /// // => 4 /// use voca_rs::Voca; /// "cafe\u{0301}"._count_graphemes(); // or "café" /// // => 4 /// ``` pub fn count_graphemes(subject: &str) -> usize { match subject.len() { 0 => 0, _ => crate::split::graphemes(subject).len(), } } /// Counts the number of `substring` appearances in `subject`. /// /// # Arguments /// /// * `subject` - The string where to count. /// * `substring` - The substring to be counted. /// /// # Example /// /// ``` /// use voca_rs::*; /// count::count_substrings("bad boys, bad boys whatcha gonna do?", "boys"); /// // => 2 /// count::count_substrings("Cafe\u{0301} del Mar", "Café"); // or "Café del Mar" /// // => 1 /// count::count_substrings("every dog has its day", "cat"); /// // => 0 /// use voca_rs::Voca; /// "bad boys, bad boys whatcha gonna do?"._count_substrings("boys"); /// // => 2 /// ``` pub fn count_substrings(subject: &str, substring: &str) -> usize { fn match_substring(subject: &str, substring: &str) -> usize { match substring.len() { 0 => 0, _ => subject.matches(substring).count(), } } match subject.len() { 0 => 0, _ => match_substring(&subject, &substring), } } /// Counts the characters in `subject` for which `predicate` returns true. This function respects unicode. /// /// # Arguments /// /// * `subject` - The string to count characters. /// * `predicate` - The predicate function invoked on each character with a parameter `(string)`. /// /// # Example /// /// ``` /// use voca_rs::*; /// count::count_where("hola!", voca_rs::query::is_alpha); /// // => 4 /// count::count_where("2022", |s: &str| -> bool { s == "2" }); /// // => 3 /// use voca_rs::Voca; /// "hola!"._count_where(voca_rs::query::is_alpha); /// // => 4 /// ``` pub fn count_where(subject: &str, f: fn(&str) -> bool) -> usize { match subject.len() { 0 => 0, _ => { let mut res = 0; for c in crate::split::graphemes(&subject).iter() { if f(&c) { res += 1; } } res } } } /// Counts the number of words in `subject`. /// /// # Arguments /// /// * `subject` - The string where to count. /// * `pattern` - The pattern to watch words. /// /// # Example /// /// ``` /// use voca_rs::*; /// count::count_words("Gravity - can cross dimensions!", ""); /// // => 4 /// count::count_words("GravityCanCrossDimensions", ""); /// // => 4 /// count::count_words("Cafe\u{0301}-del-Mar-andBossaNova1", "-"); /// // => 4 /// use voca_rs::Voca; /// "Gravity - can cross dimensions!"._count_words(""); /// // => 4 /// ``` pub fn count_words(subject: &str, pattern: &str) -> usize { fn match_substring(subject: &str, pattern: &str) -> usize { match pattern.len() { 0 => crate::split::words(&subject).iter().count(), _ => subject .split_terminator(pattern) .collect::<Vec<_>>() .iter() .count(), } } match subject.len() { 0 => 0, _ => match_substring(&subject, &pattern), } } use std::collections::HashMap; /// Counting occurrences of unique words in `subject`. This function respects unicode. /// /// # Arguments /// /// * `subject` - The string to count characters. /// * `pattern` - The pattern to watch words. /// /// # Example /// /// ``` /// use voca_rs::*; /// count::count_unique_words("hello world wonderful world", ""); /// // => 3 /// count::count_unique_words("Arabic: أنا قادر على أكل الزجاج و هذا لا يؤلمني. أنا قادر على أكل الزجاج و.", ""); /// // => ??????????????????????????????????? /// use voca_rs::Voca; /// "Hebrew: אני יכול לאכול זכוכית וזה לא מזיק לי. אני יכול לאכול זכוכית."._count_words(""); /// // => 9 /// ``` pub fn count_unique_words(subject: &str, pattern: &str) -> usize { let mut unique_words = HashMap::new(); let words = match pattern.len() { 0 => crate::split::words(&subject), _ => subject.split_terminator(pattern).collect::<Vec<_>>(), }; if words.len() == 0 { return 0; }; for word in words { unique_words.entry(word).or_insert(0); } unique_words.len() }