/**
* Splits a condition list with nested conditions (CSS4) into multiple conditions (CSS3 compatible).
*
* @param string $conditionList
* @param string $charset
* @return array
*/
public static function splitNestedConditions($conditionList, $charset = "UTF-8")
{
// Check arguments
if (!is_string($conditionList)) {
throw new \InvalidArgumentException("Invalid type '" . gettype($conditionList) . "' for argument 'conditionList' given.");
}
if (!is_string($charset)) {
throw new \InvalidArgumentException("Invalid type '" . gettype($charset) . "' for argument 'charset' given.");
} elseif (!in_array($charset, mb_list_encodings())) {
throw new \InvalidArgumentException("Invalid value '" . $charset . "' for argument 'charset' given. Charset not supported.");
}
// Remove at-rule and unnecessary white-spaces
$conditionList = trim($conditionList, " \r\n\t\f");
// Strings and comments should already be replaced, but let's check it again...
$conditionList = Placeholder::replaceStringsAndComments($conditionList);
$inFunction = false;
$groupsOpened = 0;
$enclosedChar = null;
$conditions = [];
$currentConditions = [""];
$currentConditionKeys = [0];
$subConditionList = "";
if (preg_match('/[^\\x00-\\x7f]/', $conditionList)) {
$isAscii = false;
$strLen = mb_strlen($conditionList, $charset);
$getOr = function ($i) use($conditionList) {
return strtolower(substr($conditionList, $i, 4));
};
} else {
$isAscii = true;
$strLen = strlen($conditionList);
$getOr = function ($i) use($charset, $conditionList) {
return mb_strtolower(mb_substr($conditionList, $i, 4, $charset), $charset);
};
}
for ($i = 0, $j = $strLen; $i < $j; $i++) {
if ($isAscii === true) {
$char = $conditionList[$i];
} else {
$char = mb_substr($conditionList, $i, 1, $charset);
}
if ($char === "(") {
if ($groupsOpened > 0) {
$subConditionList .= $char;
} else {
if ($i > 0) {
$prevChar = mb_substr($conditionList, $i - 1, 1, $charset);
if ($prevChar !== "(" && $prevChar !== " ") {
$inFunction = true;
}
}
}
if ($inFunction === false) {
$groupsOpened++;
} else {
foreach ($currentConditionKeys as $index) {
$currentConditions[$index] .= $char;
}
}
} elseif ($char === ")") {
if ($inFunction === false) {
$groupsOpened--;
if ($groupsOpened > 0) {
$subConditionList .= $char;
} else {
if ($subConditionList != "") {
$subConditions = self::splitNestedConditions($subConditionList, $charset);
$newConditions = [];
foreach ($subConditions as $subCondition) {
foreach ($currentConditions as $currentCondition) {
$newConditions[] = trim($currentCondition, " \r\n\t\f") . " " . $subCondition;
}
}
$currentConditions = $newConditions;
$currentConditionKeys = array_keys($currentConditions);
}
$subConditionList = "";
}
} else {
if ($groupsOpened > 0) {
$subConditionList .= $char;
}
foreach ($currentConditionKeys as $index) {
$currentConditions[$index] .= $char;
}
$inFunction = false;
}
} elseif ($char === " " && $getOr($i) === " or ") {
if ($groupsOpened > 0) {
$subConditionList .= " or ";
} else {
foreach ($currentConditions as $currentCondition) {
$conditions[] = trim($currentCondition, " \r\n\t\f");
}
$currentConditions = [""];
$currentConditionKeys = [0];
}
$i += 4 - 1;
} else {
if ($groupsOpened > 0) {
$subConditionList .= $char;
} else {
foreach ($currentConditionKeys as $index) {
$currentConditions[$index] .= $char;
}
}
}
}
foreach ($currentConditions as $currentCondition) {
$conditions[] = trim($currentCondition, " \r\n\t\f");
}
return $conditions;
}
