64 lines
1.4 KiB
JavaScript
64 lines
1.4 KiB
JavaScript
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function binSearch(list, word) {
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let first = 0;
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let last = list.length;
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for (;;) {
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let ptr = (first + (last - first) / 2) | 0;
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if (list[ptr] === word) {
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return true;
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} else if (last - first <= 1) {
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return false;
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} else if (list[ptr] > word) {
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last = ptr;
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} else if (list[ptr] < word) {
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first = ptr;
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}
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}
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}
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export class WordSource {
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constructor() {
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this._wordData = null;
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this._currentWord = null;
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}
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isWord(word) {
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let list = this._wordData.words[word.length.toString()];
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if (!list) {
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return false;
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}
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return binSearch(list, word);
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}
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async getCurrentWord() {
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if (this._currentWord) {
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return this._currentWord;
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}
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let words = await this._fetchAllWordsIfNecessary();
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this._currentWord = words.words["4"][7];
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return this._currentWord;
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}
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async nextWord() {
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if (this._currentWord >= this._words.length - 1) {
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return false;
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}
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this._currentWord += 1;
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return true;
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}
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async _fetchAllWordsIfNecessary() {
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if (this._wordData) {
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return this._wordData;
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}
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let res = await fetch("/assets/data/words.json");
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this._wordData = await res.json();
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return this._wordData;
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}
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}
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