PhpParser\ParserAbstract::getExpectedTokens PHP Method

    protected function getExpectedTokens($state) {
        $expected = array();

        $base = $this->actionBase[$state];
        foreach ($this->symbolToName as $symbol => $name) {
            $idx = $base + $symbol;
            if ($idx >= 0 && $idx < $this->actionTableSize && $this->actionCheck[$idx] === $symbol
                || $state < $this->YY2TBLSTATE
                && ($idx = $this->actionBase[$state + $this->YYNLSTATES] + $symbol) >= 0
                && $idx < $this->actionTableSize && $this->actionCheck[$idx] === $symbol
            ) {
                if ($this->action[$idx] != $this->unexpectedTokenRule
                    && $this->action[$idx] != $this->defaultAction
                    && $symbol != $this->errorSymbol
                ) {
                    if (count($expected) == 4) {
                        /* Too many expected tokens */
                        return array();
                    }

                    $expected[] = $name;
                }
            }
        }

        return $expected;
    }