Function arrayIndexOf

docs/app/js/sanddance-app.js:113335–113375

(arr, val, byteOffset, encoding, dir)

    throw new TypeError("val must be string, number or Buffer");
}
function arrayIndexOf(arr, val, byteOffset, encoding, dir) {
    var indexSize = 1;
    var arrLength = arr.length;
    var valLength = val.length;
    if (encoding !== undefined) {
        encoding = String(encoding).toLowerCase();
        if (encoding === "ucs2" || encoding === "ucs-2" || encoding === "utf16le" || encoding === "utf-16le") {
            if (arr.length < 2 || val.length < 2) return -1;
            indexSize = 2;
            arrLength /= 2;
            valLength /= 2;
            byteOffset /= 2;
        }
    }
    function read(buf, i) {
        if (indexSize === 1) return buf[i];
        else return buf.readUInt16BE(i * indexSize);
    }
    var i1;
    if (dir) {
        var foundIndex = -1;
        for(i1 = byteOffset; i1 < arrLength; i1++)if (read(arr, i1) === read(val, foundIndex === -1 ? 0 : i1 - foundIndex)) {
            if (foundIndex === -1) foundIndex = i1;
            if (i1 - foundIndex + 1 === valLength) return foundIndex * indexSize;
        } else {
            if (foundIndex !== -1) i1 -= i1 - foundIndex;
            foundIndex = -1;
        }
    } else {
        if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength;
        for(i1 = byteOffset; i1 >= 0; i1--){
            var found = true;
            for(var j = 0; j < valLength; j++)if (read(arr, i1 + j) !== read(val, j)) {
                found = false;
                break;
            }
            if (found) return i1;
        }
    }
    return -1;
}
Buffer.prototype.includes = function includes(val, byteOffset, encoding) {
    return this.indexOf(val, byteOffset, encoding) !== -1;
};