function noop() {}

function assign(tar, src) {
	for (var k in src) tar[k] = src[k];
	return tar;
}

function blankObject() {
	return Object.create(null);
}

function destroy(detach) {
	this.destroy = noop;
	this.fire('destroy');
	this.set = this.get = noop;

	if (detach !== false) this._fragment.u();
	this._fragment.d();
	this._fragment = this._state = null;
}

function _differs(a, b) {
	return a != a ? b == b : a !== b || ((a && typeof a === 'object') || typeof a === 'function');
}

function fire(eventName, data) {
	var handlers =
		eventName in this._handlers && this._handlers[eventName].slice();
	if (!handlers) return;

	for (var i = 0; i < handlers.length; i += 1) {
		var handler = handlers[i];

		if (!handler.__calling) {
			handler.__calling = true;
			handler.call(this, data);
			handler.__calling = false;
		}
	}
}

function get(key) {
	return key ? this._state[key] : this._state;
}

function init(component, options) {
	component._handlers = blankObject();
	component._bind = options._bind;

	component.options = options;
	component.root = options.root || component;
	component.store = component.root.store || options.store;
}

function observe(key, callback, options) {
	var fn = callback.bind(this);

	if (!options || options.init !== false) {
		fn(this.get()[key], undefined);
	}

	return this.on(options && options.defer ? 'update' : 'state', function(event) {
		if (event.changed[key]) fn(event.current[key], event.previous && event.previous[key]);
	});
}

function on(eventName, handler) {
	if (eventName === 'teardown') return this.on('destroy', handler);

	var handlers = this._handlers[eventName] || (this._handlers[eventName] = []);
	handlers.push(handler);

	return {
		cancel: function() {
			var index = handlers.indexOf(handler);
			if (~index) handlers.splice(index, 1);
		}
	};
}

function set(newState) {
	this._set(assign({}, newState));
	if (this.root._lock) return;
	this.root._lock = true;
	callAll(this.root._beforecreate);
	callAll(this.root._oncreate);
	callAll(this.root._aftercreate);
	this.root._lock = false;
}

function _set(newState) {
	var oldState = this._state,
		changed = {},
		dirty = false;

	for (var key in newState) {
		if (this._differs(newState[key], oldState[key])) changed[key] = dirty = true;
	}
	if (!dirty) return;

	this._state = assign(assign({}, oldState), newState);
	this._recompute(changed, this._state);
	if (this._bind) this._bind(changed, this._state);

	if (this._fragment) {
		this.fire("state", { changed: changed, current: this._state, previous: oldState });
		this._fragment.p(changed, this._state);
		this.fire("update", { changed: changed, current: this._state, previous: oldState });
	}
}

function callAll(fns) {
	while (fns && fns.length) fns.shift()();
}

function _mount(target, anchor) {
	this._fragment[this._fragment.i ? 'i' : 'm'](target, anchor || null);
}

function _unmount() {
	if (this._fragment) this._fragment.u();
}

var proto = {
	destroy: destroy,
	get: get,
	fire: fire,
	observe: observe,
	on: on,
	set: set,
	teardown: destroy,
	_recompute: noop,
	_set: _set,
	_mount: _mount,
	_unmount: _unmount,
	_differs: _differs
};

/* generated by Svelte vX.Y.Z */

function a(x) {
	return x * 2;
}

function b(x) {
	return x * 3;
}

function create_main_fragment(component, state) {

	return {
		c: noop,

		m: noop,

		p: noop,

		u: noop,

		d: noop
	};
}

function SvelteComponent(options) {
	init(this, options);
	this._state = assign({}, options.data);
	this._recompute({ x: 1 }, this._state);

	this._fragment = create_main_fragment(this, this._state);

	if (options.target) {
		this._fragment.c();
		this._mount(options.target, options.anchor);
	}
}

assign(SvelteComponent.prototype, proto);

SvelteComponent.prototype._recompute = function _recompute(changed, state) {
	if (changed.x) {
		if (this._differs(state.a, (state.a = a(state.x)))) changed.a = true;
		if (this._differs(state.b, (state.b = b(state.x)))) changed.b = true;
	}
};

export default SvelteComponent;