simple domain language for storing conditions in text fields

enql.js

var _ = require('underscore'),
    operators = {
        'in': function(field){
            var values = [];
            for(var i = 1; i< arguments.length; i++)
                values.push(arguments[i]);
            return function(row){
                var test = Array.isArray(row[field]) ? row[field] : [row[field]];
                return _.intersection(test, values).length > 0;
            }
        },
        'empty': function(field){
            return function(row){
                return !row[field];
            }
        },
        'and': function(){
            var conditions = [];
            for(var i = 0; i< arguments.length; i++)
                conditions.push(arguments[i]);
            return function(row){
                return !!conditions.every(function(cnd){
                    return condition(cnd)(row);
                })
            }
        },
        'or' : function(){
            var conditions = [];
            for(var i = 0; i< arguments.length; i++)
                conditions.push(arguments[i]);
            return function(row){
                return !conditions.every(function(cnd){
                    return !condition(cnd)(row);
                })
            }
        },
        'true': function(){
            return function(){return true;};
        },
        'false': function(){
            return function(){return false;};
        }
    },

    condition = function(conditions){
        return Array.isArray(conditions) && conditions[0] && operators[conditions[0]]
            ? operators[conditions[0]].apply(operators, conditions.slice(1))
            : function(){return conditions};
    };

module.exports = condition;