osumerge/www/js/util.js

function addGlobalStyle(text)
{
	var style = document.createElement('style');
	style.type='text/css';
	if(style.styleSheet) {
		style.styleSheet.cssText = text;
	} else {
		style.appendChild(document.createTextNode(text));
	}
	document.getElementsByTagName('head')[0].appendChild(style);
	return style;
}

function hasClass(ele, cls)
{
	return !!ele.className.match(new RegExp('(\\s|^)'+cls+'(\\s|$)'));
}

function addClass(ele, cls)
{
	if(!hasClass(ele,cls)) ele.className += " "+cls;
}

Array.prototype.where = function(predicate) {
	output = [];
	for(const elem of this) {
		if(predicate(elem)) output.push(elem);
	}
	return output;
};

Array.prototype.associate = function(keys) {
	var output = {};
	for(let i=0;i<this.length;i++)
	{
		output[keys[i]] = this[i];
	}
	return output;
};

String.prototype.il_switch = function(obj, def) {
	for(const key of obj)
	{
		if(this === key) return obj[key];
	}
	return def;
};

function removeClass(ele,cls)
{
	if(hasClass(ele,cls))
	{
		const reg = new RegExp('(\\s|^)'+cls+'(\\s|$)');
		ele.className = ele.className.replace(reg, ' ');
	}
}


function Dispatcher() {
	this.hooks = {};
}

Dispatcher.prototype.hook = function(name, value) {
	if(this.hooks[name]) {
		this.hooks[name].push(value); 
		return {id: name, index: this.hooks[name].length-1};
	}
	else {
		this.hooks[name] = [value];
		return {id: name, index: 0};
	}
	
};

Dispatcher.prototype.signal = function(name,value) {
	if(this.hooks[name]) {
		for(const hook of this.hooks[name])i
			if(hook)
				hook(value);
	}
};

Dispatcher.prototype.unhook = function(hook) {
	const name = hook.id;
	if(name && hook.index && this.hooks[name]) {
		this.hooks[name][hook.index] = null;
	}
};

Dispatcher.prototype.clear = function(name) {
	if(name) this.hooks[name] = null;
	else this.hooks = {};
};