@svrooij/sunspec/lib/sunspec-converter.js

Reading sunspec

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.SunspecConverter = void 0;
class SunspecConverter {
    static computeWithFactor(value, factor) {
        const decimals = SunspecConverter.int16(factor);
        const actualValue = value * SunspecConverter.factor(decimals);
        if (decimals < 0) {
            const rounding = Math.pow(10, decimals * -1);
            return Math.round(actualValue * rounding) / rounding;
        }
        return actualValue;
    }
    static int16(uint) {
        return (uint << 16) >> 16;
    }
    static factor(int16) {
        return Math.pow(10, int16);
    }
    /**
     * Convert a uint to 2 letters
     *
     * @static
     * @param {number} uint Value from a register
     * @returns {string}
     * @memberof SunspecConverter
     */
    static chars(uint) {
        if (uint === 0) {
            return "";
        }
        // Sample input: 21359 becomes 'So'
        // Take the first letter by shifting 8 bytes 
        const first = uint >> 8; // holds 83 = ascii 'S'
        let last = uint % 256; // Take the remainder holds 111 = ascii 'o'
        if (last === 0) {
            return String.fromCharCode(first);
        }
        return String.fromCharCode(first, last);
    }
    /**
     * Converts multiple numbers containing a string to the original string
     *
     * @static
     * @param {number[]} uints
     * @returns {string}
     * @memberof SunspecConverter
     */
    static string(uints) {
        let output = "";
        uints.forEach(v => {
            output += SunspecConverter.chars(v);
        });
        return output.trim();
    }
}
exports.SunspecConverter = SunspecConverter;
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