RedBone.js

"use strict";
const DEBUG = !!+localStorage.get('DEBUG');

function base(self, parent) {
    self.__proto__.__proto__ = parent;
}

function copy(a, b) {
    if (b)
        b = {};
    for(var name in a)
        b[name] = a[name];
    return b;
}

function empty(object) {
    for(var key in object)
        return false;
    return true;
}

var Events = {
    on: function(name, call, ctx) {
        if (!this._events)
            this._events = {};
        if (ctx)
            call = call.bind(ctx);
        if (!name)
            name = '.';
        (this._events || (this._events[name] = [])).push(call);
        return this;
    },

    once: function(name, call, ctx) {
        var self = this;
        if (ctx)
            call = call.bind(ctx);
        var _once = (function (call) {
            call();
            self.off(_once);
        }).bind(this, call);
        this.on(name, _once);
        return this;
    },

    off: function(name, call) {
        if (!this._events)
            return this;
        if (!name)
            this._events = {};
        if (!this._events[name])
            return this;
        if (!call)
            this._events[name] = [];
        delete this._events[name][call];
        return this;
    },

    trigger: function(name, args) {
        var self = this;
        if (this._events) {
            if (this._events[name])
                this._events[name].forEach(function (call) {
                    call(args);
                });
            if (this._events['.'])
                this._events['.'].forEach(function (call) {
                    call(name, self, args);
                });
        }
        return this;
    }
};

function Model(attributes) {
    base(this, Events);
    this.attributes = attributes || {};
    this.changed = {};
}

Model.prototype = {
    initialize: Function(),
    had: function(name) {
        return undefined !== this.attributes[name];
    },

    has: function(name) {
        return this.had(name) || undefined !== this.attributes[name];
    },

    get: function(name) {
        if (this.changed[name])
            return this.changed[name];
        else
            return this.attributes[name];
    },

    set: function(name, value) {
        var changed = Object.create(null);
        changed[name] = value;
        this.change(changed);
        return this;
    },

    change: function(changed) {
        copy(changed, this.changed);
        this.trigger('change', changed);
        return this;
    },

    unset: function(name) {
        delete this.changed[name];
        delete this.attributes[name];
        return this;
    },

    clear: function() {
        for(var name in this.attributes)
            this.unset(name);
        return this;
    },

    hasChanged: function() {
        return this.changed.length > 0;
    },

    changedAttributes: function() {
        return copy(this.changed);
    },

    previous: function(name) {
        return copy(this.attributes[name]);
    },

    previousAttributes: function() {
        return copy(this.attributes);
    },

    isNew: function() {
        return !!this.id;
    },

    dump: function() {
        var dump = copy(this.attributes);
        return copy(dump, this.changed);
    },

    clone: function(omits) {
        var attributes;
        if (omits) {
            attributes = this.previousAttributes();
            for(var i in omits)
                delete attributes[omits[i]];
        }
        else
            attributes = this.attributes;
        return new this.constructor(attributes);
    }
};

function List(list) {
    base(this, Events);
    this.list = list || [];
    this.model = Model;
}

List.prototype = {
    add: function(models) {
        if (!(models instanceof Array))
            models = [models];
        for(var i in models) {
            var m = models[i];
            if (!(m instanceof Model)) {
                m = new this.model(m);
                models[i] = m;
            }
            this.list.push(m);
        }
        if (models.length > 0)
            this.trigger('add', models);
        return this;
    },

    update: function(models) {
        if (!(models instanceof Array))
            models = [models];
        for(var i in models) {
            var m = models[i];
            if (!m.id)
                throw new Error('Model id is not defined');
            var existing = this.where({id: m.id}, true)();
            if (!existing)
                throw new Error('Model not found');
            existing.update(models);
        }
        if (models.length > 0)
            this.trigger('update', models);
        return this;
    },

    change: function(models) {
        var inserts = [];
        for(var i in models) {
            var m = models[i];
            if (m instanceof Model && m.isNew())
                inserts.push(m);
            if (m.id) {
                var existing = this.where({id: m.id}, true)();
                if (existing)
                    existing.update(m);
                else
                    inserts.push(m);
            }
            else throw new Error('Behaviour is undefined');
        }
        this.add(inserts);
    },

    where: function(attributes, lazy) {
        var list = this.list;
        var i = 0;
        function iterate() {
            var m = list[i];
            if (!m)
                return null;
            var match = true;
            for (var key in attributes)
                if (m.get(key) != attributes[key]) {
                    match = false;
                    break;
                }
            i++;
            if (match)
                return m;
            else
                return iterate();
        }

        if (lazy)
            return iterate();
        else {
            var matches = [];
            var m;
            while(m = iterate())
                matches.push(m);
            return matches;
        }
    }
};

function validate(changed, validates) {
    var errors = {};
    for(var name in changed) {
        var validate = validates[name];
        if (validate)
            validate(name, changed[name], errors);
    }
    return errors;
}

function valid(model, validates) {
    model.errors = {};
    model.validates = validates || {};
    model.on('change', function() {
        model.errors = RedBone.validate(model.changed, model.validates);
    });
    model.isValid = function() {
        return empty(this.errors);
    }
}

function prettify(object, apply = DEBUG) {
    return apply ? JSON.stringify(object, null, '\t') : JSON.stringify(object);
}

function permanent(id, object) {
    return localStorage.setItem(id, prettify(object));
}

function Storage() {

}

Storage.prototype = {

};