90 lines
1.9 KiB
JavaScript
90 lines
1.9 KiB
JavaScript
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"use strict";
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const {
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createWriteStream
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} = require('fs');
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const {
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Readable
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} = require('stream');
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class StatsSerializeStream extends Readable {
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constructor(stats) {
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super();
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this._indentLevel = 0;
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this._stringifier = this._stringify(stats);
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}
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get _indent() {
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return ' '.repeat(this._indentLevel);
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}
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_read() {
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let readMore = true;
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while (readMore) {
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const {
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value,
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done
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} = this._stringifier.next();
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if (done) {
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this.push(null);
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readMore = false;
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} else {
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readMore = this.push(value);
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}
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}
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}
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*_stringify(obj) {
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if (typeof obj === 'string' || typeof obj === 'number' || typeof obj === 'boolean' || obj === null) {
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yield JSON.stringify(obj);
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} else if (Array.isArray(obj)) {
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yield '[';
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this._indentLevel++;
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let isFirst = true;
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for (let item of obj) {
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if (item === undefined) {
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item = null;
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}
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yield `${isFirst ? '' : ','}\n${this._indent}`;
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yield* this._stringify(item);
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isFirst = false;
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}
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this._indentLevel--;
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yield obj.length ? `\n${this._indent}]` : ']';
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} else {
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yield '{';
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this._indentLevel++;
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let isFirst = true;
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const entries = Object.entries(obj);
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for (const [itemKey, itemValue] of entries) {
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if (itemValue === undefined) {
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continue;
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}
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yield `${isFirst ? '' : ','}\n${this._indent}${JSON.stringify(itemKey)}: `;
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yield* this._stringify(itemValue);
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isFirst = false;
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}
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this._indentLevel--;
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yield entries.length ? `\n${this._indent}}` : '}';
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}
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}
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}
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exports.StatsSerializeStream = StatsSerializeStream;
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exports.writeStats = writeStats;
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async function writeStats(stats, filepath) {
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return new Promise((resolve, reject) => {
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new StatsSerializeStream(stats).on('end', resolve).on('error', reject).pipe(createWriteStream(filepath));
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});
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}
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