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<?php |
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/** |
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* Input for parser |
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*/ |
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namespace xKerman\Restricted; |
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/** |
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* Parser Input |
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*/ |
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class Source |
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{ |
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/** @var string $str given string to deserialize */ |
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private $str; |
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/** @var int $length given string length */ |
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private $length; |
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/** @var int $current current position of parser */ |
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private $current; |
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/** |
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* constructor |
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* |
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* @param string $str parser input |
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* @throws \InvalidArgumentException |
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*/ |
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45 |
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public function __construct($str) |
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{ |
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if (!is_string($str)) { |
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1 |
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throw new \InvalidArgumentException('expected string, but got: ' . gettype($str)); |
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} |
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$this->str = $str; |
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$this->length = strlen($str); |
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$this->current = 0; |
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} |
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/** |
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* throw error with currnt position |
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* |
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* @return void |
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* @throws UnserializeFailedException |
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*/ |
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1 |
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public function triggerError() |
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{ |
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1 |
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$bytes = strlen($this->str); |
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throw new UnserializeFailedException("unserialize(): Error at offset {$this->current} of {$bytes} bytes"); |
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} |
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/** |
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* return current character |
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* |
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* @return string |
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*/ |
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public function peek() |
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{ |
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return substr($this->str, $this->current, 1); |
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} |
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/** |
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* consume given string if it is as expected |
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* |
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* @param string $expected expected string |
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* @param integer $length length of $expected |
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* @return void |
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* @throws UnserializeFailedException |
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*/ |
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public function consume($expected, $length) |
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{ |
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if (strpos($this->str, $expected, $this->current) !== $this->current) { |
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1 |
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return $this->triggerError(); |
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} |
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$this->current += $length; |
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} |
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/** |
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* read givin length substring |
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* |
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* @param integer $length length to read |
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* @return string |
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* @throws UnserializeFailedException |
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*/ |
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public function read($length) |
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{ |
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if ($length < 0) { |
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1 |
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return $this->triggerError(); |
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} |
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if ($this->current + $length > $this->length) { |
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1 |
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return $this->triggerError(); |
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} |
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$this->current += $length; |
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return substr($this->str, $this->current - $length, $length); |
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} |
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/** |
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* return matching string for given regexp |
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* |
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* @param string $regexp Regular Expression for expected substring |
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* @return string |
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*/ |
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public function match($regexp) |
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{ |
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$matched = preg_match($regexp, $this->str, $matches, 0, $this->current); |
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if ($matched === 0 || $matched === false) { |
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1 |
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return $this->triggerError(); |
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} |
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$this->current += strlen($matches[0]); |
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return isset($matches[1]) ? $matches[1] : $matches[0]; |
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} |
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} |
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xKerman /
restricted-unserialize
