protected function propertyNotation($content)
{
// PHP only supports $this inside anonymous functions since 5.4
$minifier = $this;
$keywords = $this->keywordsReserved;
$callback = function ($match) use($minifier, $keywords) {
$property = trim($minifier->extracted[$match[1]], '\'"');
/*
* Check if the property is a reserved keyword. In this context (as
* property of an object literal/array) it shouldn't matter, but IE8
* freaks out with "Expected identifier".
*/
if (in_array($property, $keywords)) {
return $match[0];
}
/*
* See if the property is in a variable-like format (e.g.
* array['key-here'] can't be replaced by array.key-here since '-'
* is not a valid character there.
*/
if (!preg_match('/^' . $minifier::REGEX_VARIABLE . '$/u', $property)) {
return $match[0];
}
return '.' . $property;
};
/*
* Figure out if previous character is a variable name (of the array
* we want to use property notation on) - this is to make sure
* standalone ['value'] arrays aren't confused for keys-of-an-array.
* We can (and only have to) check the last character, because PHP's
* regex implementation doesn't allow unfixed-length look-behind
* assertions.
*/
preg_match('/(\\[[^\\]]+\\])[^\\]]*$/', static::REGEX_VARIABLE, $previousChar);
$previousChar = $previousChar[1];
/*
* Make sure word preceding the ['value'] is not a keyword, e.g.
* return['x']. Because -again- PHP's regex implementation doesn't allow
* unfixed-length look-behind assertions, I'm just going to do a lot of
* separate look-behind assertions, one for each keyword.
*/
$keywords = $this->getKeywordsForRegex($keywords);
$keywords = '(?<!' . implode(')(?<!', $keywords) . ')';
return preg_replace_callback('/(?<=' . $previousChar . '|\\])' . $keywords . '\\[\\s*(([\'"])[0-9]+\\2)\\s*\\]/u', $callback, $content);
}
