DaQuirm/nexus

var nx = {};

nx.Mapping = function (pattern) {
    this.pattern = pattern;
};

nx.Mapping.prototype.map = function (source, target) {
    if (typeof this.pattern !== 'undefined') {
        for (var item in this.pattern) {
            if (item === '_' && typeof target !== 'undefined') {
                target[this.pattern[item]] = source;
            } else if (this.pattern[item] === '_' && typeof source !== 'undefined') {
                target = source[item];
                return target;
            } else if (typeof source !== 'undefined' && typeof target !== 'undefined') {
                target[this.pattern[item]] = source[item];
            }
        }
        return target;
    } else {
        target = source;
        return target;
    }
};

nx.Mapping.prototype.inverse = function () {
    var inversePattern = {};
    for (var item in this.pattern) {
        inversePattern[this.pattern[item]] = item;
    }
    return new nx.Mapping(inversePattern);
};

module.exports = nx.Mapping;