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/**
* Copyright (c) 2013-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @typechecks
*/
/**
* Unicode algorithms for Hangul script, the Korean writing system
*
* Hangul script has three encoded models in Unicode:
*
* A) Conjoining Jamo (covers modern and historic elements)
* * U+1100..U+11FF ; Hangul Jamo
* * U+A960..U+A97F ; Hangul Jamo Extended-A
* * U+D7B0..U+D7FF ; Hangul Jamo Extended-B
*
* B) Conjoined Syllables (only covers modern Korean language)
* * U+AC00..U+D7AF ; Hangul Syllables
*
* C) Compatibility Jamo (one code-point for each "shape")
* * U+3130..U+318F ; Hangul Compatibility Jamo
*
* This modules helps you convert characters from one model to another.
* Primary functionalities are:
*
* 1) Convert from any encodings to Conjoining Jamo characters (A),
* e.g. for prefix matching
*
* 2) Convert from any encodings to Syllable characters, when possible (B),
* e.g. to reach the normal Unicode form (NFC)
*/
'use strict';
var HANGUL_COMPATIBILITY_OR_SYLLABLE_REGEX = /[\u3130-\u318F\uAC00-\uD7AF]/;
/**
* Returns true if the input includes any Hangul Compatibility Jamo or
* Hangul Conjoined Syllable.
*
* @param {string} str
*/
function hasCompatibilityOrSyllable(str) {
return HANGUL_COMPATIBILITY_OR_SYLLABLE_REGEX.test(str);
}
/* Compatibility Jamo -> Conjoining Jamo
*
* Maps a compatibility character to the Conjoining Jamo character,
* positioned at (compatibilityCodePoint - 0x3131).
*
* Generated by:
* $ grep '^31[3-8].;' UnicodeData.txt |\
* awk -F';' '{print $6}' | awk '{print " 0x"$2","}'
*/
var CMAP = [0x1100, 0x1101, 0x11AA, 0x1102, 0x11AC, 0x11AD, 0x1103, 0x1104, 0x1105, 0x11B0, 0x11B1, 0x11B2, 0x11B3, 0x11B4, 0x11B5, 0x111A, 0x1106, 0x1107, 0x1108, 0x1121, 0x1109, 0x110A, 0x110B, 0x110C, 0x110D, 0x110E, 0x110F, 0x1110, 0x1111, 0x1112, 0x1161, 0x1162, 0x1163, 0x1164, 0x1165, 0x1166, 0x1167, 0x1168, 0x1169, 0x116A, 0x116B, 0x116C, 0x116D, 0x116E, 0x116F, 0x1170, 0x1171, 0x1172, 0x1173, 0x1174, 0x1175, 0x1160, 0x1114, 0x1115, 0x11C7, 0x11C8, 0x11CC, 0x11CE, 0x11D3, 0x11D7, 0x11D9, 0x111C, 0x11DD, 0x11DF, 0x111D, 0x111E, 0x1120, 0x1122, 0x1123, 0x1127, 0x1129, 0x112B, 0x112C, 0x112D, 0x112E, 0x112F, 0x1132, 0x1136, 0x1140, 0x1147, 0x114C, 0x11F1, 0x11F2, 0x1157, 0x1158, 0x1159, 0x1184, 0x1185, 0x1188, 0x1191, 0x1192, 0x1194, 0x119E, 0x11A1];
var CBASE = 0x3131;
var CCOUNT = CMAP.length;
var CTOP = CBASE + CCOUNT;
/**
* Maps one Hangul Compatibility Jamo code-point to the equivalent Hangul
* Conjoining Jamo characters, as defined in UnicodeData.txt.
*
* @param {number} codePoint One Unicode code-point
* @output {string}
*/
function fromCompatibility(codePoint) {
return String.fromCharCode(CMAP[codePoint - CBASE]);
}
/**
* Conjoined Syllable -> Conjoining Jamo
*
* Based on the "Hangul Syllable Decomposition" algorithm provided in
* 3.12 Conjoining Jamo Behavior, The Unicode Standard, Version 6.3.0.
* <http://www.unicode.org/versions/Unicode6.2.0/ch03.pdf>
*/
var LBASE = 0x1100;
var VBASE = 0x1161;
var TBASE = 0x11A7;
var SBASE = 0xAC00;
var LCOUNT = 19;
var VCOUNT = 21;
var TCOUNT = 28;
var NCOUNT = VCOUNT * TCOUNT;
var SCOUNT = LCOUNT * NCOUNT;
var STOP = SBASE + SCOUNT;
/**
* Maps one Hangul Syllable code-point to the equivalent Hangul
* Conjoining Jamo characters, as defined in UnicodeData.txt.
*
* @param {number} codePoint One Unicode character
* @output {string}
*/
function decomposeSyllable(codePoint) {
var sylSIndex = codePoint - SBASE;
var sylTIndex = sylSIndex % TCOUNT;
return String.fromCharCode(LBASE + sylSIndex / NCOUNT) + String.fromCharCode(VBASE + sylSIndex % NCOUNT / TCOUNT) + (sylTIndex > 0 ? String.fromCharCode(TBASE + sylTIndex) : '');
}
/* To Conjoining Jamo */
/**
* Return Unicode characters as they are, except for Hangul characters, which
* will be converted to the Conjoining Jamo form.
*
* @param {string} string
* @output {string}
*/
function toConjoiningJamo(string) {
if (!hasCompatibilityOrSyllable(string)) {
return string;
}
var result = [];
for (var i = 0; i < string.length; i++) {
var charStr = string.charAt(i);
var codeUnit = charStr.charCodeAt(0);
result.push(CBASE <= codeUnit && codeUnit < CTOP ? fromCompatibility(codeUnit) : SBASE <= codeUnit && codeUnit < STOP ? decomposeSyllable(codeUnit) : charStr);
}
return result.join('');
}
var UnicodeHangulKorean = {
toConjoiningJamo: toConjoiningJamo
};
module.exports = UnicodeHangulKorean;
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