gazeplotter/dist/class/Eye/EyeParser/EyeParser.js

Gazeplotter is a Svelte application for visualizing eye-tracking data.

/**
 * Responsible for parsing the stream of const from the eye tracking file to chunks of text.
 *
 * The stream is decoded using a TextDecoderStream.
 * File is assumed to be always complete, there is no need to check for end of file.
 */
export class EyeParser {
    rs;
    reader;
    isDone = false;
    constructor(rs, decoder = new TextDecoderStream()) {
        this.rs = rs.pipeThrough(decoder);
        this.reader = this.rs.getReader();
    }
    /**
     * Parses one chunk of text from the stream.
     * @returns {Promise<string>} The chunk of text.
     * @throws {Error} If the parser is done.
     */
    async getTextChunk() {
        if (this.isDone)
            throw new Error('EyeParser is done');
        const { value, done } = await this.reader.read();
        if (done) {
            this.isDone = true;
            return '';
        }
        return value;
    }
}