marc4js/lib/util.js

a node.js module for handling MARC data

'use strict';

exports.isInt = function (val) {
    return /^\d+$/.test(val);
};

/** A formatter that pad 0 in front of an integer if the number of
 * digit is less than numDigits (default numDigits is 5). If
 * the number of digits in the integer is greater than numDigits, it will
 * return a string of length numDigits and all digits are 9s.
 */
exports.formatInteger = function (val, numDigits) {
    numDigits = typeof numDigits !== 'undefined' ? numDigits : 5;
    var s = val + "";
    var v = "";
    if (s.length > numDigits) {
        while (v.length < numDigits) v = '9' + v;
    } else {
        v = s;
        while (v.length < numDigits) v = '0' + v;
    }
    return v;
};

exports.isControlField = function (tag) {
    if (tag.length == 3 && tag.charAt(0) == '0' && tag.charAt(1) == '0' && tag.charAt(2) >= '0' && tag.charAt(2) <= '9')// if (Integer.parseInt(tag) < 10)
        return true;
    return false;
};