/**
* Scans the current tokens for operators by the order they are
* in $precedences and creates scopes for each expression next to
* those operators
*
* @param array $precedences
* @return void
*/
protected function precedenceShiftTokens($precedences)
{
$operator = array_shift($precedences);
if (!$operator) {
return;
}
if (in_array($operator, $this->tokens, true)) {
$this->operator = $operator;
$tokens = $this->tokens;
$this->tokens = array($scope = new self());
foreach ($tokens as $token) {
if ($token === $this->operator) {
$this->tokens[] = $scope = new self();
} else {
$scope->pushToken($token);
}
}
foreach ($this->tokens as $scope) {
$scope->precedenceShiftTokens($precedences);
}
}
$this->precedenceShiftTokens($precedences);
}
