/**
* Auxiliary recursive method. Does the recursive interpolation.
*/
public static function doInterpolation($key, array $context, array &$solvedContext, array &$stack)
{
if (isset($solvedContext[$key])) {
return $solvedContext[$key];
}
if (in_array($key, $stack)) {
trigger_error(sprintf('Cyclic recursion: %s -> %s', implode(' -> ', $stack), $key), E_USER_WARNING);
return $solvedContext[$key] = '';
}
if (!isset($context[$key])) {
trigger_error(sprintf('Undefined key: "%s"', $key), E_USER_WARNING);
return $solvedContext[$key] = '';
}
if (!is_string($context[$key])) {
return $solvedContext[$key] = $context[$key];
}
$callback = function ($matches) use($context, &$solvedContext, &$stack) {
list(, $subkey) = $matches;
$value = Interpolator::doInterpolation($subkey, $context, $solvedContext, $stack);
if (is_array($value)) {
trigger_error(sprintf('Array interpolation: "%s"', $subkey), E_USER_WARNING);
return '<array>';
} elseif (is_object($value)) {
trigger_error(sprintf('Object interpolation: "%s"', $subkey), E_USER_WARNING);
return '<object>';
}
return $value;
};
// Matches things like {{whatever}}, {{ what}ever }}, {{what}e}v}e}r }}...
// and replaces the string comprised between "{{" and "}}"
array_push($stack, $key);
$solvedContext[$key] = preg_replace_callback('/\\{\\{\\s*((?:(?!}})\\S)+)\\s*}}/', $callback, $context[$key]);
array_pop($stack);
return $solvedContext[$key];
}
/**
* @test
* @group warnings
*/
public function objectInterpolation()
{
$object = new \stdClass();
$context = array('key' => '({{objectKey}})', 'objectKey' => $object);
$expected = array('key' => '(<object>)', 'objectKey' => $object);
$this->assertEquals($expected, $this->interpolator->interpolate($context));
$this->assertTriggeredError('Object interpolation: "objectKey"', E_USER_WARNING);
}
