//! Utilities for handling characters in the Unicode "Halfwidth and Fullwidth Forms" block. use std::mem::transmute; /// Checks if `ch` is in the Unicode "Halfwidth and Fullwidth Forms" block. /// /// # Example /// ```rust /// assert_eq!(unicode_hfwidth::is_nonstandard_width('カ'), false); /// assert_eq!(unicode_hfwidth::is_nonstandard_width('ｶ'), true); /// ``` pub fn is_nonstandard_width(ch: char) -> bool { match ch as u32 { 0xff00...0xffee => true, _ => false, } } /// Returns the standard-width form for `ch`. If `ch` is not in the Unicode /// "Halfwidth and Fullwidth forms" block, returns `None`. /// /// # Example /// ```rust /// assert_eq!(unicode_hfwidth::to_standard_width('カ'), None); /// assert_eq!(unicode_hfwidth::to_standard_width('ｶ'), Some('カ')); /// assert_eq!(unicode_hfwidth::to_standard_width('ａ'), Some('a')); /// ``` pub fn to_standard_width(ch: char) -> Option { match ch as u32 { 0xff01...0xff60 => to_halfwidth(ch), 0xff61...0xffdc => to_fullwidth(ch), 0xffe0...0xffe6 => to_halfwidth(ch), 0xffe8...0xffee => to_fullwidth(ch), _ => None } } /// Returns the half-width form for `ch`. If no half-width form for `ch` exists, /// or `ch` is already in half-width form, returns `None`. /// /// # Example /// ```rust /// assert_eq!(unicode_hfwidth::to_halfwidth('カ'), Some('ｶ')); /// assert_eq!(unicode_hfwidth::to_halfwidth('a'), None); /// ``` pub fn to_halfwidth(ch: char) -> Option { let ch = ch as u32; unsafe { match ch { /* Full-width variant characters */ 0xff01...0xff5e => Some(transmute(ch - 0xff01 + 0x0021)), 0xff5f...0xff60 => Some(transmute(ch - 0xff5f + 0x2985)), 0xffe0...0xffe1 => Some(transmute(ch - 0xffe0 + 0x00a2)), 0xffe2 => Some(transmute(0x00acu32)), 0xffe3 => Some(transmute(0x00afu32)), 0xffe4 => Some(transmute(0x00a6u32)), 0xffe5 => Some(transmute(0x00a5u32)), 0xffe6 => Some(transmute(0x20a9u32)), /* Natural full-width characters */ 0x3002 => Some(transmute(0xff61u32)), 0x300c => Some(transmute(0xff62u32)), 0x300d => Some(transmute(0xff63u32)), 0x3001 => Some(transmute(0xff64u32)), 0x30fb => Some(transmute(0xff65u32)), 0x30f2 => Some(transmute(0xff66u32)), 0x30a1 => Some(transmute(0xff67u32)), 0x30a3 => Some(transmute(0xff68u32)), 0x30a5 => Some(transmute(0xff69u32)), 0x30a7 => Some(transmute(0xff6au32)), 0x30a9 => Some(transmute(0xff6bu32)), 0x30e3 => Some(transmute(0xff6cu32)), 0x30e5 => Some(transmute(0xff6du32)), 0x30e7 => Some(transmute(0xff6eu32)), 0x30c3 => Some(transmute(0xff6fu32)), 0x30fc => Some(transmute(0xff70u32)), 0x30a2 => Some(transmute(0xff71u32)), 0x30a4 => Some(transmute(0xff72u32)), 0x30a6 => Some(transmute(0xff73u32)), 0x30a8 => Some(transmute(0xff74u32)), 0x30aa => Some(transmute(0xff75u32)), 0x30ab => Some(transmute(0xff76u32)), 0x30ad => Some(transmute(0xff77u32)), 0x30af => Some(transmute(0xff78u32)), 0x30b1 => Some(transmute(0xff79u32)), 0x30b3 => Some(transmute(0xff7au32)), 0x30b5 => Some(transmute(0xff7bu32)), 0x30b7 => Some(transmute(0xff7cu32)), 0x30b9 => Some(transmute(0xff7du32)), 0x30bb => Some(transmute(0xff7eu32)), 0x30bd => Some(transmute(0xff7fu32)), 0x30bf => Some(transmute(0xff80u32)), 0x30c1 => Some(transmute(0xff81u32)), 0x30c4 => Some(transmute(0xff82u32)), 0x30c6 => Some(transmute(0xff83u32)), 0x30c8 => Some(transmute(0xff84u32)), 0x30ca => Some(transmute(0xff85u32)), 0x30cb => Some(transmute(0xff86u32)), 0x30cc => Some(transmute(0xff87u32)), 0x30cd => Some(transmute(0xff88u32)), 0x30ce => Some(transmute(0xff89u32)), 0x30cf => Some(transmute(0xff8au32)), 0x30d2 => Some(transmute(0xff8bu32)), 0x30d5 => Some(transmute(0xff8cu32)), 0x30d8 => Some(transmute(0xff8du32)), 0x30db => Some(transmute(0xff8eu32)), 0x30de => Some(transmute(0xff8fu32)), 0x30df => Some(transmute(0xff90u32)), 0x30e0 => Some(transmute(0xff91u32)), 0x30e1 => Some(transmute(0xff92u32)), 0x30e2 => Some(transmute(0xff93u32)), 0x30e4 => Some(transmute(0xff94u32)), 0x30e6 => Some(transmute(0xff95u32)), 0x30e8 => Some(transmute(0xff96u32)), 0x30e9 => Some(transmute(0xff97u32)), 0x30ea => Some(transmute(0xff98u32)), 0x30eb => Some(transmute(0xff99u32)), 0x30ec => Some(transmute(0xff9au32)), 0x30ed => Some(transmute(0xff9bu32)), 0x30ef => Some(transmute(0xff9cu32)), 0x30f3 => Some(transmute(0xff9du32)), 0x3099 => Some(transmute(0xff9eu32)), 0x309a => Some(transmute(0xff9fu32)), 0x3164 => Some(transmute(0xffa0u32)), 0x3131 => Some(transmute(0xffa1u32)), 0x3132 => Some(transmute(0xffa2u32)), 0x3133 => Some(transmute(0xffa3u32)), 0x3134 => Some(transmute(0xffa4u32)), 0x3135 => Some(transmute(0xffa5u32)), 0x3136 => Some(transmute(0xffa6u32)), 0x3137 => Some(transmute(0xffa7u32)), 0x3138 => Some(transmute(0xffa8u32)), 0x3139 => Some(transmute(0xffa9u32)), 0x313a => Some(transmute(0xffaau32)), 0x313b => Some(transmute(0xffabu32)), 0x313c => Some(transmute(0xffacu32)), 0x313d => Some(transmute(0xffadu32)), 0x313e => Some(transmute(0xffaeu32)), 0x313f => Some(transmute(0xffafu32)), 0x3140 => Some(transmute(0xffb0u32)), 0x3141 => Some(transmute(0xffb1u32)), 0x3142 => Some(transmute(0xffb2u32)), 0x3143 => Some(transmute(0xffb3u32)), 0x3144 => Some(transmute(0xffb4u32)), 0x3145 => Some(transmute(0xffb5u32)), 0x3146 => Some(transmute(0xffb6u32)), 0x3147 => Some(transmute(0xffb7u32)), 0x3148 => Some(transmute(0xffb8u32)), 0x3149 => Some(transmute(0xffb9u32)), 0x314a => Some(transmute(0xffbau32)), 0x314b => Some(transmute(0xffbbu32)), 0x314c => Some(transmute(0xffbcu32)), 0x314d => Some(transmute(0xffbdu32)), 0x314e => Some(transmute(0xffbeu32)), 0x314f => Some(transmute(0xffc2u32)), 0x3150 => Some(transmute(0xffc3u32)), 0x3151 => Some(transmute(0xffc4u32)), 0x3152 => Some(transmute(0xffc5u32)), 0x3153 => Some(transmute(0xffc6u32)), 0x3154 => Some(transmute(0xffc7u32)), 0x3155 => Some(transmute(0xffcau32)), 0x3156 => Some(transmute(0xffcbu32)), 0x3157 => Some(transmute(0xffccu32)), 0x3158 => Some(transmute(0xffcdu32)), 0x3159 => Some(transmute(0xffceu32)), 0x315a => Some(transmute(0xffcfu32)), 0x315b => Some(transmute(0xffd2u32)), 0x315c => Some(transmute(0xffd3u32)), 0x315d => Some(transmute(0xffd4u32)), 0x315e => Some(transmute(0xffd5u32)), 0x315f => Some(transmute(0xffd6u32)), 0x3160 => Some(transmute(0xffd7u32)), 0x3161 => Some(transmute(0xffdau32)), 0x3162 => Some(transmute(0xffdbu32)), 0x3163 => Some(transmute(0xffdcu32)), 0x2502 => Some(transmute(0xffe8u32)), 0x2190 => Some(transmute(0xffe9u32)), 0x2191 => Some(transmute(0xffeau32)), 0x2192 => Some(transmute(0xffebu32)), 0x2193 => Some(transmute(0xffecu32)), 0x25a0 => Some(transmute(0xffedu32)), 0x25cb => Some(transmute(0xffeeu32)), _ => None } } } /// Returns the full-width form for `ch`. If no full-width form for `ch` exists, /// or `ch` is already in full-width form, returns `None`. /// /// # Example /// ```rust /// assert_eq!(unicode_hfwidth::to_fullwidth('a'), Some('ａ')); /// assert_eq!(unicode_hfwidth::to_fullwidth('カ'), None); /// ``` pub fn to_fullwidth(ch: char) -> Option { let ch = ch as u32; unsafe { match ch { /* Half-width variant characters */ 0xff61 => Some(transmute(0x3002u32)), 0xff62 => Some(transmute(0x300cu32)), 0xff63 => Some(transmute(0x300du32)), 0xff64 => Some(transmute(0x3001u32)), 0xff65 => Some(transmute(0x30fbu32)), 0xff66 => Some(transmute(0x30f2u32)), 0xff67 => Some(transmute(0x30a1u32)), 0xff68 => Some(transmute(0x30a3u32)), 0xff69 => Some(transmute(0x30a5u32)), 0xff6a => Some(transmute(0x30a7u32)), 0xff6b => Some(transmute(0x30a9u32)), 0xff6c => Some(transmute(0x30e3u32)), 0xff6d => Some(transmute(0x30e5u32)), 0xff6e => Some(transmute(0x30e7u32)), 0xff6f => Some(transmute(0x30c3u32)), 0xff70 => Some(transmute(0x30fcu32)), 0xff71 => Some(transmute(0x30a2u32)), 0xff72 => Some(transmute(0x30a4u32)), 0xff73 => Some(transmute(0x30a6u32)), 0xff74 => Some(transmute(0x30a8u32)), 0xff75 => Some(transmute(0x30aau32)), 0xff76 => Some(transmute(0x30abu32)), 0xff77 => Some(transmute(0x30adu32)), 0xff78 => Some(transmute(0x30afu32)), 0xff79 => Some(transmute(0x30b1u32)), 0xff7a => Some(transmute(0x30b3u32)), 0xff7b => Some(transmute(0x30b5u32)), 0xff7c => Some(transmute(0x30b7u32)), 0xff7d => Some(transmute(0x30b9u32)), 0xff7e => Some(transmute(0x30bbu32)), 0xff7f => Some(transmute(0x30bdu32)), 0xff80 => Some(transmute(0x30bfu32)), 0xff81 => Some(transmute(0x30c1u32)), 0xff82 => Some(transmute(0x30c4u32)), 0xff83 => Some(transmute(0x30c6u32)), 0xff84 => Some(transmute(0x30c8u32)), 0xff85 => Some(transmute(0x30cau32)), 0xff86 => Some(transmute(0x30cbu32)), 0xff87 => Some(transmute(0x30ccu32)), 0xff88 => Some(transmute(0x30cdu32)), 0xff89 => Some(transmute(0x30ceu32)), 0xff8a => Some(transmute(0x30cfu32)), 0xff8b => Some(transmute(0x30d2u32)), 0xff8c => Some(transmute(0x30d5u32)), 0xff8d => Some(transmute(0x30d8u32)), 0xff8e => Some(transmute(0x30dbu32)), 0xff8f => Some(transmute(0x30deu32)), 0xff90 => Some(transmute(0x30dfu32)), 0xff91 => Some(transmute(0x30e0u32)), 0xff92 => Some(transmute(0x30e1u32)), 0xff93 => Some(transmute(0x30e2u32)), 0xff94 => Some(transmute(0x30e4u32)), 0xff95 => Some(transmute(0x30e6u32)), 0xff96 => Some(transmute(0x30e8u32)), 0xff97 => Some(transmute(0x30e9u32)), 0xff98 => Some(transmute(0x30eau32)), 0xff99 => Some(transmute(0x30ebu32)), 0xff9a => Some(transmute(0x30ecu32)), 0xff9b => Some(transmute(0x30edu32)), 0xff9c => Some(transmute(0x30efu32)), 0xff9d => Some(transmute(0x30f3u32)), 0xff9e => Some(transmute(0x3099u32)), 0xff9f => Some(transmute(0x309au32)), 0xffa0 => Some(transmute(0x3164u32)), 0xffa1 => Some(transmute(0x3131u32)), 0xffa2 => Some(transmute(0x3132u32)), 0xffa3 => Some(transmute(0x3133u32)), 0xffa4 => Some(transmute(0x3134u32)), 0xffa5 => Some(transmute(0x3135u32)), 0xffa6 => Some(transmute(0x3136u32)), 0xffa7 => Some(transmute(0x3137u32)), 0xffa8 => Some(transmute(0x3138u32)), 0xffa9 => Some(transmute(0x3139u32)), 0xffaa => Some(transmute(0x313au32)), 0xffab => Some(transmute(0x313bu32)), 0xffac => Some(transmute(0x313cu32)), 0xffad => Some(transmute(0x313du32)), 0xffae => Some(transmute(0x313eu32)), 0xffaf => Some(transmute(0x313fu32)), 0xffb0 => Some(transmute(0x3140u32)), 0xffb1 => Some(transmute(0x3141u32)), 0xffb2 => Some(transmute(0x3142u32)), 0xffb3 => Some(transmute(0x3143u32)), 0xffb4 => Some(transmute(0x3144u32)), 0xffb5 => Some(transmute(0x3145u32)), 0xffb6 => Some(transmute(0x3146u32)), 0xffb7 => Some(transmute(0x3147u32)), 0xffb8 => Some(transmute(0x3148u32)), 0xffb9 => Some(transmute(0x3149u32)), 0xffba => Some(transmute(0x314au32)), 0xffbb => Some(transmute(0x314bu32)), 0xffbc => Some(transmute(0x314cu32)), 0xffbd => Some(transmute(0x314du32)), 0xffbe => Some(transmute(0x314eu32)), 0xffc2 => Some(transmute(0x314fu32)), 0xffc3 => Some(transmute(0x3150u32)), 0xffc4 => Some(transmute(0x3151u32)), 0xffc5 => Some(transmute(0x3152u32)), 0xffc6 => Some(transmute(0x3153u32)), 0xffc7 => Some(transmute(0x3154u32)), 0xffca => Some(transmute(0x3155u32)), 0xffcb => Some(transmute(0x3156u32)), 0xffcc => Some(transmute(0x3157u32)), 0xffcd => Some(transmute(0x3158u32)), 0xffce => Some(transmute(0x3159u32)), 0xffcf => Some(transmute(0x315au32)), 0xffd2 => Some(transmute(0x315bu32)), 0xffd3 => Some(transmute(0x315cu32)), 0xffd4 => Some(transmute(0x315du32)), 0xffd5 => Some(transmute(0x315eu32)), 0xffd6 => Some(transmute(0x315fu32)), 0xffd7 => Some(transmute(0x3160u32)), 0xffda => Some(transmute(0x3161u32)), 0xffdb => Some(transmute(0x3162u32)), 0xffdc => Some(transmute(0x3163u32)), 0xffe8 => Some(transmute(0x2502u32)), 0xffe9 => Some(transmute(0x2190u32)), 0xffea => Some(transmute(0x2191u32)), 0xffeb => Some(transmute(0x2192u32)), 0xffec => Some(transmute(0x2193u32)), 0xffed => Some(transmute(0x25a0u32)), 0xffee => Some(transmute(0x25cbu32)), /* Natural half-width characters */ 0x0021...0x007e => Some(transmute(ch - 0x0021 + 0xff01)), 0x2985...0x2986 => Some(transmute(ch - 0x2985 + 0xff5f)), 0x00a2...0x00a3 => Some(transmute(ch - 0x00a2 + 0xffe0)), 0x00ac => Some(transmute(0xffe2u32)), 0x00af => Some(transmute(0xffe3u32)), 0x00a6 => Some(transmute(0xffe4u32)), 0x00a5 => Some(transmute(0xffe5u32)), 0x20a9 => Some(transmute(0xffe6u32)), _ => None, } } } #[test] fn test_katakana() { let full = "アイウエオカキクケコサシスセソタチツテトナニヌネノハヒフヘホマミムメモヤユヨラリルレロワン"; let half = "ｱｲｳｴｵｶｷｸｹｺｻｼｽｾｿﾀﾁﾂﾃﾄﾅﾆﾇﾈﾉﾊﾋﾌﾍﾎﾏﾐﾑﾒﾓﾔﾕﾖﾗﾘﾙﾚﾛﾜﾝ"; for (f, h) in full.chars().zip(half.chars()) { assert_eq!(to_fullwidth(h).unwrap(), f); } } #[test] fn test_katakana_rev() { let full = "アイウエオカキクケコサシスセソタチツテトナニヌネノハヒフヘホマミムメモヤユヨラリルレロワン"; let half = "ｱｲｳｴｵｶｷｸｹｺｻｼｽｾｿﾀﾁﾂﾃﾄﾅﾆﾇﾈﾉﾊﾋﾌﾍﾎﾏﾐﾑﾒﾓﾔﾕﾖﾗﾘﾙﾚﾛﾜﾝ"; for (f, h) in full.chars().zip(half.chars()) { assert_eq!(to_halfwidth(f).unwrap(), h); } } #[test] fn test_a() { assert_eq!(to_fullwidth('a').unwrap(), 'ａ'); }