function noop() {}

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

function appendNode(node, target) {
	target.appendChild(node);
}

function insertNode(node, target, anchor) {
	target.insertBefore(node, anchor);
}

function detachNode(node) {
	node.parentNode.removeChild(node);
}

function createElement(name) {
	return document.createElement(name);
}

function createText(data) {
	return document.createTextNode(data);
}

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 destroyDev(detach) {
	destroy.call(this, detach);
	this.destroy = function() {
		console.warn('Component was already destroyed');
	};
}

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

function dispatchObservers(component, group, changed, newState, oldState) {
	for (var key in group) {
		if (!changed[key]) continue;

		var newValue = newState[key];
		var oldValue = oldState[key];

		var callbacks = group[key];
		if (!callbacks) continue;

		for (var i = 0; i < callbacks.length; i += 1) {
			var callback = callbacks[i];
			if (callback.__calling) continue;

			callback.__calling = true;
			callback.call(component, newValue, oldValue);
			callback.__calling = false;
		}
	}
}

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) {
		handlers[i].call(this, data);
	}
}

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

function init(component, options) {
	component._observers = { pre: blankObject(), post: blankObject() };
	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 group = options && options.defer
		? this._observers.post
		: this._observers.pre;

	(group[key] || (group[key] = [])).push(callback);

	if (!options || options.init !== false) {
		callback.__calling = true;
		callback.call(this, this._state[key]);
		callback.__calling = false;
	}

	return {
		cancel: function() {
			var index = group[key].indexOf(callback);
			if (~index) group[key].splice(index, 1);
		}
	};
}

function observeDev(key, callback, options) {
	var c = (key = '' + key).search(/[.[]/);
	if (c > -1) {
		var message =
			'The first argument to component.observe(...) must be the name of a top-level property';
		if (c > 0)
			message += ", i.e. '" + key.slice(0, c) + "' rather than '" + key + "'";

		throw new Error(message);
	}

	return observe.call(this, key, callback, options);
}

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 onDev(eventName, handler) {
	if (eventName === 'teardown') {
		console.warn(
			"Use component.on('destroy', ...) instead of component.on('teardown', ...) which has been deprecated and will be unsupported in Svelte 2"
		);
		return this.on('destroy', handler);
	}

	return on.call(this, eventName, handler);
}

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) {
		dispatchObservers(this, this._observers.pre, changed, this._state, oldState);
		this._fragment.p(changed, this._state);
		dispatchObservers(this, this._observers.post, changed, this._state, oldState);
	}
}

function setDev(newState) {
	if (typeof newState !== 'object') {
		throw new Error(
			this._debugName + '.set was called without an object of data key-values to update.'
		);
	}

	this._checkReadOnly(newState);
	set.call(this, newState);
}

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 protoDev = {
	destroy: destroyDev,
	get: get,
	fire: fire,
	observe: observeDev,
	on: onDev,
	set: setDev,
	teardown: destroyDev,
	_recompute: noop,
	_set: _set,
	_mount: _mount,
	_unmount: _unmount,
	_differs: _differs
};

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

function bar(foo) {
	return foo * 2;
}

function create_main_fragment(component, state) {
	var p, text_value = state.Math.max(0, state.foo), text, text_1, text_2;

	return {
		c: function create() {
			p = createElement("p");
			text = createText(text_value);
			text_1 = createText("\n\t");
			text_2 = createText(state.bar);
		},

		m: function mount(target, anchor) {
			insertNode(p, target, anchor);
			appendNode(text, p);
			appendNode(text_1, p);
			appendNode(text_2, p);
		},

		p: function update(changed, state) {
			if ((changed.Math || changed.foo) && text_value !== (text_value = state.Math.max(0, state.foo))) {
				text.data = text_value;
			}

			if (changed.bar) {
				text_2.data = state.bar;
			}
		},

		u: function unmount() {
			detachNode(p);
		},

		d: noop
	};
}

function SvelteComponent(options) {
	this._debugName = '<SvelteComponent>';
	if (!options || (!options.target && !options.root)) throw new Error("'target' is a required option");
	init(this, options);
	this._state = assign({ Math : Math }, options.data);
	this._recompute({ foo: 1 }, this._state);
	if (!('foo' in this._state)) console.warn("<SvelteComponent> was created without expected data property 'foo'");

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

	if (options.target) {
		if (options.hydrate) throw new Error("options.hydrate only works if the component was compiled with the `hydratable: true` option");
		this._fragment.c();
		this._mount(options.target, options.anchor);
	}
}

assign(SvelteComponent.prototype, protoDev);

SvelteComponent.prototype._checkReadOnly = function _checkReadOnly(newState) {
	if ('bar' in newState && !this._updatingReadonlyProperty) throw new Error("<SvelteComponent>: Cannot set read-only property 'bar'");
};

SvelteComponent.prototype._recompute = function _recompute(changed, state) {
	if (changed.foo) {
		if (this._differs(state.bar, (state.bar = bar(state.foo)))) changed.bar = true;
	}
};

export default SvelteComponent;