src/Language/Lexer.php
private function moveStringCursor($positionOffset, $byteStreamOffset)
    {
        $this->position           += $positionOffset;
        $this->byteStreamPosition += $byteStreamOffset;

        return $this;
    }
private function moveStringCursor($positionOffset, $byteStreamOffset)
    {
        $this->position           += $positionOffset;
        $this->byteStreamPosition += $byteStreamOffset;

        return $this;
    }
Moves internal string cursor position

@param int $positionOffset
@param int $byteStreamOffset

@return self