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<?php |
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/** |
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* @author Alexander Getmanskii <[email protected]> |
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* @package GetSky\ParserExpressions |
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*/ |
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namespace GetSky\ParserExpressions; |
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use Exception; |
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/** |
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* It is a wrapper for parsing string. |
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*/ |
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class Context |
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{ |
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/** |
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* @var string Parsing string. |
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*/ |
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protected $string; |
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/** |
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* @var int The number of the current position. |
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*/ |
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protected $cursor = 0; |
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/** |
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* @var int The current depth of immersion in the rules tree. |
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*/ |
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protected $depth = 0; |
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/** |
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* @var ErrorCollectionInterface |
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*/ |
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protected $errors; |
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/** |
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* @param ErrorCollectionInterface $errorCollection |
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*/ |
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public function __construct(ErrorCollectionInterface $errorCollection) |
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{ |
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$this->errors = $errorCollection; |
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} |
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/** |
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* Set new string and reset cursor. |
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* |
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* @param string $string |
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* @return void |
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*/ |
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public function setString($string) |
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{ |
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$this->string = (string) $string; |
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$this->cursor = 0; |
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$this->depth = 0; |
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$this->errors->clear(); |
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} |
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/** |
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* Returns the characters from the current position with the given $size. |
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* |
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* @param int $size |
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* @return bool|string |
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*/ |
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public function value($size = 1) |
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{ |
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if ($this->cursor + $size > strlen($this->string)) { |
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return false; |
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} |
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$value = substr($this->string, $this->cursor, $size); |
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$this->cursor += $size; |
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return $value; |
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} |
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/** |
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* Returns the current value of the cursor. |
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* |
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* @return int |
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*/ |
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public function getCursor() |
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{ |
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return $this->cursor; |
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} |
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/** |
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* Sets a new value for the cursor. |
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* |
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* @param int $position |
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* @throws Exception |
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*/ |
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public function setCursor($position) |
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{ |
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if ($position < 0) { |
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throw new Exception('The cursor can\'t be negative.'); |
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} |
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$this->cursor = $position; |
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} |
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/** |
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* Increase the depth by one. |
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* |
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* @throws Exception |
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*/ |
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public function increaseDepth() |
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{ |
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$this->depth++; |
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} |
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/** |
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* Decrease the depth by one. |
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* |
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* @throws Exception |
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*/ |
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public function decreaseDepth() |
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{ |
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if ($this->depth == 0) { |
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throw new Exception('The depth can\'t be negative.'); |
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} |
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$this->depth--; |
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} |
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/** |
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* @param RuleInterface $rule |
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* @param int $index |
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*/ |
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public function error(RuleInterface $rule, $index) |
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{ |
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$this->errors->add($rule, $index, $this->depth); |
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} |
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} |
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JimmDiGrizli /
RoyalStag
