218 lines
No EOL
7 KiB
JavaScript
218 lines
No EOL
7 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.splitGraphemes = exports.GraphemeBreaker = exports.graphemeBreakAtIndex = exports.codePointToClass = exports.BREAK_ALLOWED = exports.BREAK_NOT_ALLOWED = exports.UnicodeTrie = exports.fromCodePoint = exports.toCodePoints = exports.classes = void 0;
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var grapheme_break_trie_1 = require("./grapheme-break-trie");
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var utrie_1 = require("utrie");
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var Other = 0;
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var Prepend = 1;
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var CR = 2;
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var LF = 3;
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var Control = 4;
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var Extend = 5;
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var Regional_Indicator = 6;
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var SpacingMark = 7;
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var L = 8;
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var V = 9;
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var T = 10;
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var LV = 11;
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var LVT = 12;
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var ZWJ = 13;
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var Extended_Pictographic = 14;
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var RI = 15;
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exports.classes = {
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Other: Other,
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Prepend: Prepend,
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CR: CR,
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LF: LF,
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Control: Control,
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Extend: Extend,
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Regional_Indicator: Regional_Indicator,
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SpacingMark: SpacingMark,
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L: L,
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V: V,
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T: T,
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LV: LV,
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LVT: LVT,
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ZWJ: ZWJ,
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Extended_Pictographic: Extended_Pictographic,
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RI: RI,
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};
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var toCodePoints = function (str) {
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var codePoints = [];
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var i = 0;
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var length = str.length;
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while (i < length) {
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var value = str.charCodeAt(i++);
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if (value >= 0xd800 && value <= 0xdbff && i < length) {
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var extra = str.charCodeAt(i++);
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if ((extra & 0xfc00) === 0xdc00) {
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codePoints.push(((value & 0x3ff) << 10) + (extra & 0x3ff) + 0x10000);
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}
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else {
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codePoints.push(value);
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i--;
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}
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}
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else {
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codePoints.push(value);
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}
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}
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return codePoints;
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};
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exports.toCodePoints = toCodePoints;
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var fromCodePoint = function () {
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var codePoints = [];
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for (var _i = 0; _i < arguments.length; _i++) {
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codePoints[_i] = arguments[_i];
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}
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if (String.fromCodePoint) {
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return String.fromCodePoint.apply(String, codePoints);
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}
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var length = codePoints.length;
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if (!length) {
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return '';
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}
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var codeUnits = [];
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var index = -1;
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var result = '';
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while (++index < length) {
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var codePoint = codePoints[index];
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if (codePoint <= 0xffff) {
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codeUnits.push(codePoint);
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}
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else {
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codePoint -= 0x10000;
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codeUnits.push((codePoint >> 10) + 0xd800, (codePoint % 0x400) + 0xdc00);
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}
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if (index + 1 === length || codeUnits.length > 0x4000) {
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result += String.fromCharCode.apply(String, codeUnits);
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codeUnits.length = 0;
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}
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}
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return result;
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};
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exports.fromCodePoint = fromCodePoint;
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exports.UnicodeTrie = utrie_1.createTrieFromBase64(grapheme_break_trie_1.base64, grapheme_break_trie_1.byteLength);
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exports.BREAK_NOT_ALLOWED = '×';
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exports.BREAK_ALLOWED = '÷';
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var codePointToClass = function (codePoint) { return exports.UnicodeTrie.get(codePoint); };
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exports.codePointToClass = codePointToClass;
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var _graphemeBreakAtIndex = function (_codePoints, classTypes, index) {
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var prevIndex = index - 2;
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var prev = classTypes[prevIndex];
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var current = classTypes[index - 1];
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var next = classTypes[index];
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// GB3 Do not break between a CR and LF
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if (current === CR && next === LF) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// GB4 Otherwise, break before and after controls.
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if (current === CR || current === LF || current === Control) {
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return exports.BREAK_ALLOWED;
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}
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// GB5
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if (next === CR || next === LF || next === Control) {
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return exports.BREAK_ALLOWED;
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}
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// Do not break Hangul syllable sequences.
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// GB6
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if (current === L && [L, V, LV, LVT].indexOf(next) !== -1) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// GB7
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if ((current === LV || current === V) && (next === V || next === T)) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// GB8
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if ((current === LVT || current === T) && next === T) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// GB9 Do not break before extending characters or ZWJ.
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if (next === ZWJ || next === Extend) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// Do not break before SpacingMarks, or after Prepend characters.
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// GB9a
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if (next === SpacingMark) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// GB9a
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if (current === Prepend) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// GB11 Do not break within emoji modifier sequences or emoji zwj sequences.
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if (current === ZWJ && next === Extended_Pictographic) {
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while (prev === Extend) {
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prev = classTypes[--prevIndex];
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}
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if (prev === Extended_Pictographic) {
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return exports.BREAK_NOT_ALLOWED;
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}
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}
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// GB12 Do not break within emoji flag sequences.
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// That is, do not break between regional indicator (RI) symbols
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// if there is an odd number of RI characters before the break point.
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if (current === RI && next === RI) {
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var countRI = 0;
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while (prev === RI) {
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countRI++;
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prev = classTypes[--prevIndex];
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}
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if (countRI % 2 === 0) {
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return exports.BREAK_NOT_ALLOWED;
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}
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}
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return exports.BREAK_ALLOWED;
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};
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var graphemeBreakAtIndex = function (codePoints, index) {
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// GB1 Break at the start and end of text, unless the text is empty.
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if (index === 0) {
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return exports.BREAK_ALLOWED;
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}
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// GB2
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if (index >= codePoints.length) {
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return exports.BREAK_ALLOWED;
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}
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var classTypes = codePoints.map(exports.codePointToClass);
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return _graphemeBreakAtIndex(codePoints, classTypes, index);
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};
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exports.graphemeBreakAtIndex = graphemeBreakAtIndex;
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var GraphemeBreaker = function (str) {
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var codePoints = exports.toCodePoints(str);
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var length = codePoints.length;
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var index = 0;
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var lastEnd = 0;
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var classTypes = codePoints.map(exports.codePointToClass);
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return {
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next: function () {
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if (index >= length) {
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return { done: true, value: null };
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}
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var graphemeBreak = exports.BREAK_NOT_ALLOWED;
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while (index < length &&
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(graphemeBreak = _graphemeBreakAtIndex(codePoints, classTypes, ++index)) === exports.BREAK_NOT_ALLOWED) { }
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if (graphemeBreak !== exports.BREAK_NOT_ALLOWED || index === length) {
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var value = exports.fromCodePoint.apply(null, codePoints.slice(lastEnd, index));
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lastEnd = index;
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return { value: value, done: false };
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}
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return { done: true, value: null };
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while (index < length) { }
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return { done: true, value: null };
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},
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};
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};
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exports.GraphemeBreaker = GraphemeBreaker;
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var splitGraphemes = function (str) {
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var breaker = exports.GraphemeBreaker(str);
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var graphemes = [];
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var bk;
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while (!(bk = breaker.next()).done) {
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if (bk.value) {
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graphemes.push(bk.value.slice());
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}
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}
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return graphemes;
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};
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exports.splitGraphemes = splitGraphemes;
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//# sourceMappingURL=GraphemeBreak.js.map
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