gregswindle/jsrules

'use strict';
var Proposition;

Proposition = function(name, value) {
  this.name = name;
  this.value = value;
  this.type = 'jsrules.Proposition';
  this.and = function(proposition) {
    var result = {
      name: '(' + this.name + ' AND ' + proposition.name + ')',
      value: this.value && proposition.value
    };
    return new Proposition(result.name, result.value);
  };

  this.not = function() {
    var result = {
      name: '(NOT ' + this.name + ')',
      value: !this.value
    };
    return new Proposition(result.name, result.value);
  };

  this.or = function(proposition) {
    var result = {
      name: '(' + this.name + ' OR ' + proposition.name + ')',
      value: this.value || proposition.value
    };
    return new Proposition(result.name, result.value);
  };

  this.xor = function(proposition) {
    var result = {
      name: '(' + this.name + ' XOR ' + proposition.name + ')',
      /* jshint ignore:start */
      value: !this.value !== !proposition.value
      /* jshint ignore:end */
    };
    return new Proposition(result.name, result.value);
  };

  this.toString = function() {
    return 'Proposition statement = ' + this.name + ', value = ' + this.value;
  };
};

module.exports = Proposition;