37 lines
1.0 KiB
JavaScript
37 lines
1.0 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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/**
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* GraphemerIterator
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*
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* Takes a string and a "BreakHandler" method during initialisation
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* and creates an iterable object that returns individual graphemes.
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*
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* @param str {string}
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* @return GraphemerIterator
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*/
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class GraphemerIterator {
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constructor(str, nextBreak) {
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this._index = 0;
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this._str = str;
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this._nextBreak = nextBreak;
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}
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[Symbol.iterator]() {
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return this;
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}
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next() {
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let brk;
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if ((brk = this._nextBreak(this._str, this._index)) < this._str.length) {
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const value = this._str.slice(this._index, brk);
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this._index = brk;
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return { value: value, done: false };
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}
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if (this._index < this._str.length) {
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const value = this._str.slice(this._index);
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this._index = this._str.length;
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return { value: value, done: false };
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}
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return { value: undefined, done: true };
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}
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}
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exports.default = GraphemerIterator;
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