327 lines
9.4 KiB
JavaScript
327 lines
9.4 KiB
JavaScript
/**
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* @licstart The following is the entire license notice for the
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* JavaScript code in this page
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*
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* Copyright 2022 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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* @licend The above is the entire license notice for the
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* JavaScript code in this page
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*/
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.bidi = bidi;
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var _util = require("../shared/util.js");
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const baseTypes = ["BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "S", "B", "S", "WS", "B", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "B", "B", "B", "S", "WS", "ON", "ON", "ET", "ET", "ET", "ON", "ON", "ON", "ON", "ON", "ES", "CS", "ES", "CS", "CS", "EN", "EN", "EN", "EN", "EN", "EN", "EN", "EN", "EN", "EN", "CS", "ON", "ON", "ON", "ON", "ON", "ON", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "ON", "ON", "ON", "ON", "ON", "ON", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "ON", "ON", "ON", "ON", "BN", "BN", "BN", "BN", "BN", "BN", "B", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "BN", "CS", "ON", "ET", "ET", "ET", "ET", "ON", "ON", "ON", "ON", "L", "ON", "ON", "BN", "ON", "ON", "ET", "ET", "EN", "EN", "ON", "L", "ON", "ON", "ON", "EN", "L", "ON", "ON", "ON", "ON", "ON", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "ON", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "L", "ON", "L", "L", "L", "L", "L", "L", "L", "L"];
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const arabicTypes = ["AN", "AN", "AN", "AN", "AN", "AN", "ON", "ON", "AL", "ET", "ET", "AL", "CS", "AL", "ON", "ON", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "AL", "AL", "", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "AN", "AN", "AN", "AN", "AN", "AN", "AN", "AN", "AN", "AN", "ET", "AN", "AN", "AL", "AL", "AL", "NSM", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "AL", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "AN", "ON", "NSM", "NSM", "NSM", "NSM", "NSM", "NSM", "AL", "AL", "NSM", "NSM", "ON", "NSM", "NSM", "NSM", "NSM", "AL", "AL", "EN", "EN", "EN", "EN", "EN", "EN", "EN", "EN", "EN", "EN", "AL", "AL", "AL", "AL", "AL", "AL"];
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function isOdd(i) {
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return (i & 1) !== 0;
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}
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function isEven(i) {
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return (i & 1) === 0;
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}
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function findUnequal(arr, start, value) {
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let j, jj;
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for (j = start, jj = arr.length; j < jj; ++j) {
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if (arr[j] !== value) {
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return j;
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}
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}
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return j;
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}
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function setValues(arr, start, end, value) {
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for (let j = start; j < end; ++j) {
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arr[j] = value;
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}
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}
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function reverseValues(arr, start, end) {
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for (let i = start, j = end - 1; i < j; ++i, --j) {
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const temp = arr[i];
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arr[i] = arr[j];
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arr[j] = temp;
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}
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}
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function createBidiText(str, isLTR, vertical = false) {
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let dir = "ltr";
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if (vertical) {
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dir = "ttb";
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} else if (!isLTR) {
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dir = "rtl";
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}
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return {
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str,
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dir
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};
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}
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const chars = [];
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const types = [];
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function bidi(str, startLevel = -1, vertical = false) {
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let isLTR = true;
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const strLength = str.length;
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if (strLength === 0 || vertical) {
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return createBidiText(str, isLTR, vertical);
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}
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chars.length = strLength;
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types.length = strLength;
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let numBidi = 0;
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let i, ii;
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for (i = 0; i < strLength; ++i) {
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chars[i] = str.charAt(i);
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const charCode = str.charCodeAt(i);
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let charType = "L";
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if (charCode <= 0x00ff) {
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charType = baseTypes[charCode];
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} else if (0x0590 <= charCode && charCode <= 0x05f4) {
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charType = "R";
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} else if (0x0600 <= charCode && charCode <= 0x06ff) {
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charType = arabicTypes[charCode & 0xff];
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if (!charType) {
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(0, _util.warn)("Bidi: invalid Unicode character " + charCode.toString(16));
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}
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} else if (0x0700 <= charCode && charCode <= 0x08ac) {
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charType = "AL";
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}
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if (charType === "R" || charType === "AL" || charType === "AN") {
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numBidi++;
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}
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types[i] = charType;
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}
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if (numBidi === 0) {
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isLTR = true;
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return createBidiText(str, isLTR);
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}
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if (startLevel === -1) {
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if (numBidi / strLength < 0.3 && strLength > 4) {
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isLTR = true;
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startLevel = 0;
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} else {
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isLTR = false;
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startLevel = 1;
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}
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}
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const levels = [];
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for (i = 0; i < strLength; ++i) {
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levels[i] = startLevel;
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}
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const e = isOdd(startLevel) ? "R" : "L";
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const sor = e;
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const eor = sor;
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let lastType = sor;
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for (i = 0; i < strLength; ++i) {
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if (types[i] === "NSM") {
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types[i] = lastType;
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} else {
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lastType = types[i];
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}
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}
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lastType = sor;
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let t;
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for (i = 0; i < strLength; ++i) {
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t = types[i];
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if (t === "EN") {
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types[i] = lastType === "AL" ? "AN" : "EN";
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} else if (t === "R" || t === "L" || t === "AL") {
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lastType = t;
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}
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}
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for (i = 0; i < strLength; ++i) {
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t = types[i];
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if (t === "AL") {
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types[i] = "R";
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}
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}
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for (i = 1; i < strLength - 1; ++i) {
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if (types[i] === "ES" && types[i - 1] === "EN" && types[i + 1] === "EN") {
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types[i] = "EN";
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}
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if (types[i] === "CS" && (types[i - 1] === "EN" || types[i - 1] === "AN") && types[i + 1] === types[i - 1]) {
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types[i] = types[i - 1];
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}
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}
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for (i = 0; i < strLength; ++i) {
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if (types[i] === "EN") {
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for (let j = i - 1; j >= 0; --j) {
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if (types[j] !== "ET") {
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break;
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}
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types[j] = "EN";
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}
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for (let j = i + 1; j < strLength; ++j) {
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if (types[j] !== "ET") {
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break;
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}
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types[j] = "EN";
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}
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}
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}
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for (i = 0; i < strLength; ++i) {
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t = types[i];
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if (t === "WS" || t === "ES" || t === "ET" || t === "CS") {
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types[i] = "ON";
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}
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}
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lastType = sor;
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for (i = 0; i < strLength; ++i) {
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t = types[i];
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if (t === "EN") {
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types[i] = lastType === "L" ? "L" : "EN";
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} else if (t === "R" || t === "L") {
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lastType = t;
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}
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}
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for (i = 0; i < strLength; ++i) {
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if (types[i] === "ON") {
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const end = findUnequal(types, i + 1, "ON");
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let before = sor;
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if (i > 0) {
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before = types[i - 1];
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}
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let after = eor;
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if (end + 1 < strLength) {
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after = types[end + 1];
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}
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if (before !== "L") {
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before = "R";
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}
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if (after !== "L") {
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after = "R";
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}
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if (before === after) {
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setValues(types, i, end, before);
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}
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i = end - 1;
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}
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}
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for (i = 0; i < strLength; ++i) {
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if (types[i] === "ON") {
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types[i] = e;
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}
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}
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for (i = 0; i < strLength; ++i) {
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t = types[i];
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if (isEven(levels[i])) {
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if (t === "R") {
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levels[i] += 1;
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} else if (t === "AN" || t === "EN") {
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levels[i] += 2;
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}
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} else {
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if (t === "L" || t === "AN" || t === "EN") {
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levels[i] += 1;
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}
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}
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}
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let highestLevel = -1;
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let lowestOddLevel = 99;
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let level;
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for (i = 0, ii = levels.length; i < ii; ++i) {
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level = levels[i];
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if (highestLevel < level) {
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highestLevel = level;
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}
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if (lowestOddLevel > level && isOdd(level)) {
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lowestOddLevel = level;
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}
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}
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for (level = highestLevel; level >= lowestOddLevel; --level) {
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let start = -1;
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for (i = 0, ii = levels.length; i < ii; ++i) {
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if (levels[i] < level) {
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if (start >= 0) {
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reverseValues(chars, start, i);
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start = -1;
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}
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} else if (start < 0) {
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start = i;
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}
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}
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if (start >= 0) {
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reverseValues(chars, start, levels.length);
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}
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}
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for (i = 0, ii = chars.length; i < ii; ++i) {
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const ch = chars[i];
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if (ch === "<" || ch === ">") {
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chars[i] = "";
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}
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}
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return createBidiText(chars.join(""), isLTR);
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} |