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/**
* Copyright (c) 2013-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @typechecks
*/
/**
* Unicode algorithms for CJK (Chinese, Japanese, Korean) writing systems.
*
* Utilities for Hanzi/Kanji/Hanja logographs and Kanas (Katakana and Hiragana)
* syllables.
*
* For Korean Hangul see module `UnicodeHangulKorean`.
*/
'use strict';
/**
* Latin
*
* NOTE: The code assumes these sets include only BMP characters.
*/
var R_LATIN_ASCII = 'a-zA-Z';
var R_LATIN_FULLWIDTH = "\uFF21-\uFF3A\uFF41-\uFF5A";
var R_LATIN = R_LATIN_ASCII + R_LATIN_FULLWIDTH;
/**
* Hiragana & Katakana
*
* NOTE: Some ranges include non-BMP characters. We do not support those ranges
* for now.
*/
var R_HIRAGANA = "\u3040-\u309F";
var R_KATAKANA = "\u30A0-\u30FF";
var R_KATAKANA_PHONETIC = "\u31F0-\u31FF";
var R_KATAKANA_HALFWIDTH = "\uFF65-\uFF9F"; // var R_KANA_SUPPLEMENT = '\U0001B000-\U0001B0FF';
var R_KATAKANA_ALL = R_KATAKANA + R_KATAKANA_PHONETIC + R_KATAKANA_HALFWIDTH;
var R_KANA = R_HIRAGANA + R_KATAKANA_ALL;
var I_HIRAGANA = [0x3040, 0x309F];
var I_KATAKANA = [0x30A0, 0x30FF];
var I_HIRAGANA_TO_KATAKANA = I_KATAKANA[0] - I_HIRAGANA[0];
/**
* Hanzi/Kanji/Hanja
*
* NOTE: Some ranges include non-BMP characters. We do not support those ranges
* for now.
*/
var R_IDEO_MAIN = "\u4E00-\u9FCF";
var R_IDEO_EXT_A = "\u3400-\u4DBF"; // var R_IDEO_EXT_B = '\U00020000-\U0002A6DF';
// var R_IDEO_EXT_C = '\U0002A700-\U0002B73F';
// var R_IDEO_EXT_D = '\U0002B740-\U0002B81F';
var R_IDEO = R_IDEO_MAIN + R_IDEO_EXT_A;
/**
* Hangul
*/
// var R_HANGUL_JAMO = '\u1100-\u11FF';
// var R_HANGUL_JAMO_EXT_A = '\uA960-\uA97F';
// var R_HANGUL_JAMO_EXT_B = '\uD7B0-\uD7FF';
// var R_HANGUL_COMPATIBILITY = '\u3130-\u318F';
// var R_HANGUL_COMP_HALFWIDTH = '\uFFA0-\uFFDF';
var R_HANGUL_SYLLABLES = "\uAC00-\uD7AF";
/**
* Globals
*/
var R_IDEO_OR_SYLL = R_IDEO + R_KANA + R_HANGUL_SYLLABLES;
var REGEX_IDEO = null;
var REGEX_KANA = null;
var REGEX_IDEO_OR_SYLL = null;
var REGEX_IS_KANA_WITH_TRAILING_LATIN = null;
/**
* Whether the string includes any Katakana or Hiragana characters.
*
* @param {string} str
* @return {boolean}
*/
function hasKana(str) {
REGEX_KANA = REGEX_KANA || new RegExp('[' + R_KANA + ']');
return REGEX_KANA.test(str);
}
/**
* Whether the string includes any CJK Ideograph characters.
*
* @param {string} str
* @return {boolean}
*/
function hasIdeograph(str) {
REGEX_IDEO = REGEX_IDEO || new RegExp('[' + R_IDEO + ']');
return REGEX_IDEO.test(str);
}
/**
* Whether the string includes any CJK Ideograph or Syllable characters.
*
* @param {string} str
* @return {boolean}
*/
function hasIdeoOrSyll(str) {
REGEX_IDEO_OR_SYLL = REGEX_IDEO_OR_SYLL || new RegExp('[' + R_IDEO_OR_SYLL + ']');
return REGEX_IDEO_OR_SYLL.test(str);
}
/**
* @param {string} chr
* @output {string}
*/
function charCodeToKatakana(chr) {
var charCode = chr.charCodeAt(0);
return String.fromCharCode(charCode < I_HIRAGANA[0] || charCode > I_HIRAGANA[1] ? charCode : charCode + I_HIRAGANA_TO_KATAKANA);
}
/**
* Replace any Hiragana character with the matching Katakana
*
* @param {string} str
* @output {string}
*/
function hiraganaToKatakana(str) {
if (!hasKana(str)) {
return str;
}
return str.split('').map(charCodeToKatakana).join('');
}
/**
* Whether the string is exactly a sequence of Kana characters followed by one
* Latin character.
*
* @param {string} str
* @output {string}
*/
function isKanaWithTrailingLatin(str) {
REGEX_IS_KANA_WITH_TRAILING_LATIN = REGEX_IS_KANA_WITH_TRAILING_LATIN || new RegExp('^' + '[' + R_KANA + ']+' + '[' + R_LATIN + ']' + '$');
return REGEX_IS_KANA_WITH_TRAILING_LATIN.test(str);
}
/**
* Drops the trailing Latin character from a string that is exactly a sequence
* of Kana characters followed by one Latin character.
*
* @param {string} str
* @output {string}
*/
function kanaRemoveTrailingLatin(str) {
if (isKanaWithTrailingLatin(str)) {
return str.substr(0, str.length - 1);
}
return str;
}
var UnicodeCJK = {
hasKana: hasKana,
hasIdeograph: hasIdeograph,
hasIdeoOrSyll: hasIdeoOrSyll,
hiraganaToKatakana: hiraganaToKatakana,
isKanaWithTrailingLatin: isKanaWithTrailingLatin,
kanaRemoveTrailingLatin: kanaRemoveTrailingLatin
};
module.exports = UnicodeCJK;
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