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<?php |
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/** |
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* @file |
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* |
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* Utilities for DOM traversal. |
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*/ |
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namespace QueryPath\CSS\DOMTraverser; |
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use \QueryPath\CSS\EventHandler; |
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/** |
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* Utilities for DOM Traversal. |
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*/ |
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class Util |
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{ |
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/** |
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* Check whether the given DOMElement has the given attribute. |
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* |
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* @param $node |
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* @param $name |
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* @param null $value |
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* @param int $operation |
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* @return bool |
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*/ |
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public static function matchesAttribute($node, $name, $value = NULL, $operation = EventHandler::IS_EXACTLY): bool |
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{ |
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if (!$node->hasAttribute($name)) { |
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return false; |
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} |
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if (NULL === $value) { |
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return true; |
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} |
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return self::matchesAttributeValue($value, $node->getAttribute($name), $operation); |
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} |
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/** |
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* Check whether the given DOMElement has the given namespaced attribute. |
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*/ |
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public static function matchesAttributeNS($node, $name, $nsuri, $value = NULL, $operation = EventHandler::IS_EXACTLY) |
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{ |
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if (!$node->hasAttributeNS($nsuri, $name)) { |
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return false; |
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} |
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if (is_null($value)) { |
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return true; |
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} |
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return self::matchesAttributeValue($value, $node->getAttributeNS($nsuri, $name), $operation); |
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} |
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/** |
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* Check for attr value matches based on an operation. |
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*/ |
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public static function matchesAttributeValue($needle, $haystack, $operation): bool |
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{ |
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if (strlen($haystack) < strlen($needle)) { |
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return false; |
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} |
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// According to the spec: |
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// "The case-sensitivity of attribute names in selectors depends on the document language." |
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// (6.3.2) |
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// To which I say, "huh?". We assume case sensitivity. |
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switch ($operation) { |
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case EventHandler::IS_EXACTLY: |
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return $needle == $haystack; |
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case EventHandler::CONTAINS_WITH_SPACE: |
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// XXX: This needs testing! |
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return preg_match('/\b/', $haystack) == 1; |
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//return in_array($needle, explode(' ', $haystack)); |
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case EventHandler::CONTAINS_WITH_HYPHEN: |
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return in_array($needle, explode('-', $haystack)); |
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case EventHandler::CONTAINS_IN_STRING: |
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return strpos($haystack, $needle) !== false; |
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case EventHandler::BEGINS_WITH: |
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return strpos($haystack, $needle) === 0; |
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case EventHandler::ENDS_WITH: |
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//return strrpos($haystack, $needle) === strlen($needle) - 1; |
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return preg_match('/' . $needle . '$/', $haystack) == 1; |
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} |
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return false; // Shouldn't be able to get here. |
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} |
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/** |
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* Remove leading and trailing quotes. |
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*/ |
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public static function removeQuotes(string $str) |
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{ |
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$f = mb_substr($str, 0, 1); |
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$l = mb_substr($str, -1); |
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if ($f === $l && ($f === '"' || $f === "'")) { |
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$str = mb_substr($str, 1, -1); |
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} |
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return $str; |
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} |
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/** |
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* Parse an an+b rule for CSS pseudo-classes. |
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* |
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* Invalid rules return `array(0, 0)`. This is per the spec. |
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* |
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* @param $rule |
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* Some rule in the an+b format. |
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* @retval array |
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* `array($aVal, $bVal)` of the two values. |
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* @return array |
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*/ |
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public static function parseAnB($rule): array |
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{ |
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if ($rule === 'even') { |
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return [2, 0]; |
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} |
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if ($rule === 'odd') { |
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return [2, 1]; |
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} |
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if ($rule === 'n') { |
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return [1, 0]; |
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} |
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if (is_numeric($rule)) { |
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return [0, (int)$rule]; |
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} |
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$regex = '/^\s*([+\-]?[0-9]*)n\s*([+\-]?)\s*([0-9]*)\s*$/'; |
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$matches = []; |
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$res = preg_match($regex, $rule, $matches); |
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// If it doesn't parse, return 0, 0. |
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if (!$res) { |
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return [0, 0]; |
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} |
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$aVal = $matches[1] ?? 1; |
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if ($aVal === '-') { |
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$aVal = -1; |
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} else { |
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$aVal = (int)$aVal; |
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} |
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$bVal = 0; |
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if (isset($matches[3])) { |
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$bVal = (int)$matches[3]; |
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if (isset($matches[2]) && $matches[2] === '-') { |
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$bVal *= -1; |
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} |
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} |
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return [$aVal, $bVal]; |
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} |
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} |
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arthurkushman /
querypath
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