hunspell-reader/dist/iterableToStream.js

A library for reading Hunspell Dictionary Files

import * as stream from 'node:stream';
/**
 * Transform an iterable into a node readable stream.
 */
export function iterableToStream(src, options) {
    return new ReadableObservableStream(src, options ?? { encoding: 'utf8' });
}
class ReadableObservableStream extends stream.Readable {
    _source;
    iter;
    done = false;
    constructor(_source, options) {
        super(options);
        this._source = _source;
    }
    _read() {
        if (!this.iter) {
            this.iter = this._source[Symbol.iterator]();
        }
        if (this.done) {
            // See: https://nodejs.org/api/stream.html#readablepushchunk-encoding
            // Pushing null means the stream is done.
            // eslint-disable-next-line unicorn/no-null
            this.push(null);
            return;
        }
        let r = this.iter.next();
        while (!r.done && this.push(r.value)) {
            r = this.iter.next();
        }
        if (r.done) {
            this.done = true;
            // since it is possible for r.value to have something meaningful, we must check.
            if (r.value !== null && r.value !== undefined) {
                this.push(r.value);
            }
            // See: https://nodejs.org/api/stream.html#readablepushchunk-encoding
            // Pushing null means the stream is done.
            // eslint-disable-next-line unicorn/no-null
            this.push(null);
        }
    }
}
export default iterableToStream;
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