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/*
* Copyright (C) 2020 Alex Yatskov <alex@foosoft.net>
* Author: Alex Yatskov <alex@foosoft.net>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
const jp = (() => {
const HIRAGANA_RANGE = [0x3040, 0x309f];
const KATAKANA_RANGE = [0x30a0, 0x30ff];
const KANA_RANGES = [HIRAGANA_RANGE, KATAKANA_RANGE];
const CJK_UNIFIED_IDEOGRAPHS_RANGE = [0x4e00, 0x9fff];
const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A_RANGE = [0x3400, 0x4dbf];
const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B_RANGE = [0x20000, 0x2a6df];
const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_C_RANGE = [0x2a700, 0x2b73f];
const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_D_RANGE = [0x2b740, 0x2b81f];
const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_E_RANGE = [0x2b820, 0x2ceaf];
const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_F_RANGE = [0x2ceb0, 0x2ebef];
const CJK_COMPATIBILITY_IDEOGRAPHS_SUPPLEMENT_RANGE = [0x2f800, 0x2fa1f];
const CJK_UNIFIED_IDEOGRAPHS_RANGES = [
CJK_UNIFIED_IDEOGRAPHS_RANGE,
CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A_RANGE,
CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B_RANGE,
CJK_UNIFIED_IDEOGRAPHS_EXTENSION_C_RANGE,
CJK_UNIFIED_IDEOGRAPHS_EXTENSION_D_RANGE,
CJK_UNIFIED_IDEOGRAPHS_EXTENSION_E_RANGE,
CJK_UNIFIED_IDEOGRAPHS_EXTENSION_F_RANGE,
CJK_COMPATIBILITY_IDEOGRAPHS_SUPPLEMENT_RANGE
];
// Japanese character ranges, roughly ordered in order of expected frequency
const JAPANESE_RANGES = [
HIRAGANA_RANGE,
KATAKANA_RANGE,
...CJK_UNIFIED_IDEOGRAPHS_RANGES,
[0xff66, 0xff9f], // Halfwidth katakana
[0x30fb, 0x30fc], // Katakana punctuation
[0xff61, 0xff65], // Kana punctuation
[0x3000, 0x303f], // CJK punctuation
[0xff10, 0xff19], // Fullwidth numbers
[0xff21, 0xff3a], // Fullwidth upper case Latin letters
[0xff41, 0xff5a], // Fullwidth lower case Latin letters
[0xff01, 0xff0f], // Fullwidth punctuation 1
[0xff1a, 0xff1f], // Fullwidth punctuation 2
[0xff3b, 0xff3f], // Fullwidth punctuation 3
[0xff5b, 0xff60], // Fullwidth punctuation 4
[0xffe0, 0xffee] // Currency markers
];
const SMALL_KANA_SET = new Set(Array.from('ぁぃぅぇぉゃゅょゎァィゥェォャュョヮ'));
// Character code testing functions
function isCodePointKanji(codePoint) {
return isCodePointInRanges(codePoint, CJK_UNIFIED_IDEOGRAPHS_RANGES);
}
function isCodePointKana(codePoint) {
return isCodePointInRanges(codePoint, KANA_RANGES);
}
function isCodePointJapanese(codePoint) {
return isCodePointInRanges(codePoint, JAPANESE_RANGES);
}
function isCodePointInRanges(codePoint, ranges) {
for (const [min, max] of ranges) {
if (codePoint >= min && codePoint <= max) {
return true;
}
}
return false;
}
// String testing functions
function isStringEntirelyKana(str) {
if (str.length === 0) { return false; }
for (const c of str) {
if (!isCodePointKana(c.codePointAt(0))) {
return false;
}
}
return true;
}
function isStringPartiallyJapanese(str) {
if (str.length === 0) { return false; }
for (const c of str) {
if (isCodePointJapanese(c.codePointAt(0))) {
return true;
}
}
return false;
}
// Mora functions
function isMoraPitchHigh(moraIndex, pitchAccentPosition) {
return pitchAccentPosition === 0 ? (moraIndex > 0) : (moraIndex < pitchAccentPosition);
}
function getKanaMorae(text) {
const morae = [];
let i;
for (const c of text) {
if (SMALL_KANA_SET.has(c) && (i = morae.length) > 0) {
morae[i - 1] += c;
} else {
morae.push(c);
}
}
return morae;
}
// Exports
return {
isCodePointKanji,
isCodePointKana,
isCodePointJapanese,
isStringEntirelyKana,
isStringPartiallyJapanese,
isMoraPitchHigh,
getKanaMorae
};
})();
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