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116 lines
2.9 KiB
JavaScript
Executable File
116 lines
2.9 KiB
JavaScript
Executable File
/* Copyright 2018 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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const CharacterType = {
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SPACE: 0,
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ALPHA_LETTER: 1,
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PUNCT: 2,
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HAN_LETTER: 3,
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KATAKANA_LETTER: 4,
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HIRAGANA_LETTER: 5,
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HALFWIDTH_KATAKANA_LETTER: 6,
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THAI_LETTER: 7,
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};
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function isAlphabeticalScript(charCode) {
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return charCode < 0x2e80;
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}
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function isAscii(charCode) {
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return (charCode & 0xff80) === 0;
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}
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function isAsciiAlpha(charCode) {
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return (
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(charCode >= /* a = */ 0x61 && charCode <= /* z = */ 0x7a) ||
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(charCode >= /* A = */ 0x41 && charCode <= /* Z = */ 0x5a)
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);
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}
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function isAsciiDigit(charCode) {
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return charCode >= /* 0 = */ 0x30 && charCode <= /* 9 = */ 0x39;
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}
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function isAsciiSpace(charCode) {
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return (
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charCode === /* SPACE = */ 0x20 ||
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charCode === /* TAB = */ 0x09 ||
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charCode === /* CR = */ 0x0d ||
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charCode === /* LF = */ 0x0a
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);
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}
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function isHan(charCode) {
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return (
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(charCode >= 0x3400 && charCode <= 0x9fff) ||
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(charCode >= 0xf900 && charCode <= 0xfaff)
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);
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}
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function isKatakana(charCode) {
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return charCode >= 0x30a0 && charCode <= 0x30ff;
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}
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function isHiragana(charCode) {
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return charCode >= 0x3040 && charCode <= 0x309f;
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}
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function isHalfwidthKatakana(charCode) {
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return charCode >= 0xff60 && charCode <= 0xff9f;
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}
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function isThai(charCode) {
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return (charCode & 0xff80) === 0x0e00;
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}
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/**
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* This function is based on the word-break detection implemented in:
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* https://hg.mozilla.org/mozilla-central/file/tip/intl/lwbrk/WordBreaker.cpp
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*/
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function getCharacterType(charCode) {
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if (isAlphabeticalScript(charCode)) {
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if (isAscii(charCode)) {
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if (isAsciiSpace(charCode)) {
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return CharacterType.SPACE;
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} else if (
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isAsciiAlpha(charCode) ||
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isAsciiDigit(charCode) ||
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charCode === /* UNDERSCORE = */ 0x5f
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) {
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return CharacterType.ALPHA_LETTER;
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}
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return CharacterType.PUNCT;
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} else if (isThai(charCode)) {
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return CharacterType.THAI_LETTER;
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} else if (charCode === /* NBSP = */ 0xa0) {
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return CharacterType.SPACE;
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}
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return CharacterType.ALPHA_LETTER;
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}
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if (isHan(charCode)) {
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return CharacterType.HAN_LETTER;
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} else if (isKatakana(charCode)) {
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return CharacterType.KATAKANA_LETTER;
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} else if (isHiragana(charCode)) {
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return CharacterType.HIRAGANA_LETTER;
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} else if (isHalfwidthKatakana(charCode)) {
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return CharacterType.HALFWIDTH_KATAKANA_LETTER;
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}
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return CharacterType.ALPHA_LETTER;
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}
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export { CharacterType, getCharacterType };
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