Latte helpers for HTML 5 data-attributes

example.latte

{* with helper *}
<div id="with-data" data-example="{[a => b]|data}"></div>

{* with macro *}
<div id="with-data" n:data="example, [a => b]"></div>

<script>
var data = parseDataJson($('#with-data'), 'example');
// => data == {a: 'b'}
</script>

helper.php

<?php

$template->registerHelper('data', function ($data) {
	return preg_replace('#(?<!\\\\)"([^\\\\\',]*)"#i', "'$1'", preg_replace('#"([a-z0-9]+)":#i', '$1:', json_encode($data)));
});

macro-old-nette.php

<?php

function latte_macro_data($name, $data) {
	$data = preg_replace('#"([a-z0-9]+)":#i', '$1:', json_encode($data));
	return " data-$name=\"" . preg_replace('#(?<!\\\\)"([^\\\\\',]*)"#i', "'$1'", $data) . '"';
}
LatteMacros::$defaultMacros['@data'] = '<?php echo latte_macro_data(%%); ?>';

macro.php

<?php

public function templatePrepareFilters($template)
{
	$latte = new Nette\Latte\Engine;
	$macroSet = new Nette\Latte\Macros\MacroSet($latte->parser);
	$macroSet->addMacro('@data', function ($node, $writer) {
		return $writer->write("echo ' data-' . %node.word . '=\"' . %escape(\$presenter->formatData(%node.array)) . '\"'");
	});
	$template->registerFilter($latte);
}

public function formatData($data)
{
	return preg_replace('#(?<!\\\\)"([^\\\\\',]*)"#i', "'$1'", preg_replace('#"([a-z0-9]+)":#i', '$1:', json_encode(array_shift($data))));
}

parser.js

var parseDataJson = function (el, name) {
	return eval('[' + (el.getAttribute('data-' + name) || '') + ']')[0];
};

Inspirace z http://api.nette.org/2.0/source-Forms.Controls.BaseControl.php.html#387