VarUtils.php
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<?php
/*
* This file is part of the Assetic package, an OpenSky project.
*
* (c) 2010-2014 OpenSky Project Inc
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Assetic\Util;
/**
* Variable utilities.
*
* @author Johannes M. Schmitt <schmittjoh@gmail.com>
*/
abstract class VarUtils
{
/**
* Resolves variable placeholders.
*
* @param string $template A template string
* @param array $vars Variable names
* @param array $values Variable values
*
* @return string The resolved string
*
* @throws \InvalidArgumentException If there is a variable with no value
*/
public static function resolve($template, array $vars, array $values)
{
$map = array();
foreach ($vars as $var) {
if (false === strpos($template, '{'.$var.'}')) {
continue;
}
if (!isset($values[$var])) {
throw new \InvalidArgumentException(sprintf('The template "%s" contains the variable "%s", but was not given any value for it.', $template, $var));
}
$map['{'.$var.'}'] = $values[$var];
}
return strtr($template, $map);
}
public static function getCombinations(array $vars, array $values)
{
if (!$vars) {
return array(array());
}
$combinations = array();
$nbValues = array();
foreach ($values as $var => $vals) {
if (!in_array($var, $vars, true)) {
continue;
}
$nbValues[$var] = count($vals);
}
for ($i = array_product($nbValues), $c = $i * 2; $i < $c; $i++) {
$k = $i;
$combination = array();
foreach ($vars as $var) {
$combination[$var] = $values[$var][$k % $nbValues[$var]];
$k = intval($k / $nbValues[$var]);
}
$combinations[] = $combination;
}
return $combinations;
}
final private function __construct() { }
}