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use std::char; use std::borrow::Cow; use std::string::String; const PERSIAN_TO_ENGLISH_DIFF: u32 = '۰' as u32 - '0' as u32; pub fn persian_to_english_digits<'a>(s: &'a str) -> Cow<'a, str> { let mut buf = String::with_capacity(s.len()); for c in s.chars() { let c_ = match c { '۰' ... '۹' => char::from_u32(c as u32 - PERSIAN_TO_ENGLISH_DIFF).unwrap(), _ => c, }; buf.push(c_) } return buf.into(); } pub fn english_to_persian_digits<'a>(s: &'a str) -> Cow<'a, str> { let mut buf = String::with_capacity(s.len()); for c in s.chars() { let c_ = match c { '0' ... '9' => char::from_u32(c as u32 + PERSIAN_TO_ENGLISH_DIFF).unwrap(), _ => c, }; buf.push(c_) } return buf.into(); } #[cfg(test)] mod tests { use super::*; #[test] fn persian_to_english_digits_test() { assert_eq!(persian_to_english_digits("۰۱۲۳۴۵۶۷۸۹"), "0123456789"); assert_eq!(persian_to_english_digits("0123456789"), "0123456789"); assert_eq!(persian_to_english_digits("0۱2۳4۵6۷8۹"), "0123456789"); assert_eq!(persian_to_english_digits("۰1۲3۴5۶7۸9"), "0123456789"); assert_eq!(persian_to_english_digits("hello ۰۰۱"), "hello 001"); assert_eq!(persian_to_english_digits("۰۰۰۰"), "0000"); assert_eq!(persian_to_english_digits("۰۰۰۰"), "0000"); } #[test] fn persian_to_english_digits_arabic_test() { assert_eq!(persian_to_english_digits("٠١٢٣٤٥٦٧٨٩"), "٠١٢٣٤٥٦٧٨٩"); assert_eq!(persian_to_english_digits("۰۱۲۳۴۵۶۷۸۹ ٠١٢٣٤٥٦٧٨٩"), "0123456789 ٠١٢٣٤٥٦٧٨٩"); } #[test] fn english_to_persian_digits_test() { assert_eq!(english_to_persian_digits("0123456789"), "۰۱۲۳۴۵۶۷۸۹"); assert_eq!(english_to_persian_digits("۰۱۲۳۴۵۶۷۸۹"), "۰۱۲۳۴۵۶۷۸۹"); assert_eq!(english_to_persian_digits("0۱2۳4۵6۷8۹"), "۰۱۲۳۴۵۶۷۸۹"); assert_eq!(english_to_persian_digits("۰1۲3۴5۶7۸9"), "۰۱۲۳۴۵۶۷۸۹"); assert_eq!(english_to_persian_digits("hello 001"), "hello ۰۰۱"); assert_eq!(english_to_persian_digits("0000"), "۰۰۰۰"); assert_eq!(english_to_persian_digits("0000"), "۰۰۰۰"); } }