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<?php declare(strict_types=1); |
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/** |
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* Created by Vitaly Iegorov <[email protected]>. |
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* on 06.04.17 at 07:30 |
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*/ |
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namespace samsonframework\stringconditiontree\string; |
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use samsonframework\stringconditiontree\AbstractIterable; |
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/** |
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* This class describes string character group structure(CGS). |
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* |
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* @author Vitaly Egorov <[email protected]> |
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*/ |
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class Structure extends AbstractIterable |
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{ |
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/** array Supported character group types */ |
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const CG_TYPES = [ |
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FixedVariableCG::class, |
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VariableFixedCG::class, |
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VariableCG::class, |
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FixedCG::class, |
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]; |
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/** @var AbstractCG[] */ |
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public $groups = []; |
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/** @var string Input string */ |
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public $string; |
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/** |
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* Create string character group structure from string string. |
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* |
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* @param string $input Input string for string character group structure |
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*/ |
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public function __construct(string $input) |
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{ |
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$this->string = $input; |
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parent::__construct('groups'); |
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// Iterate until string is cleared |
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while (strlen($input)) { |
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foreach (self::CG_TYPES as $characterGroupType) { |
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// Try to create character group |
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if (($group = $characterGroupType::fromString($input)) !== null) { |
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$this->groups[] = $group; |
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// Reset CG type iterator to preserve order |
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break; |
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} |
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} |
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} |
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} |
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/** |
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* Compare structure character groups. |
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* |
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* @param Structure $structure Compared string structure group |
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* |
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* @return int Comparison result |
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*/ |
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public function compare(Structure $structure): int |
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{ |
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$initialStructureSize = count($this->groups); |
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$comparedStructureSize = count($structure->groups); |
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$maxSize = max($initialStructureSize, $comparedStructureSize); |
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if ($initialStructureSize === 0) { |
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return -1; |
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} |
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if ($comparedStructureSize === 0) { |
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return 1; |
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} |
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// Iterate maximum sized structure |
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for ($index = 0; $index < $maxSize; $index++) { |
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// Get compared/initial group or last compared character group is size mismatches |
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$comparedGroup = $structure->groups[$index] ?? $structure->groups[$comparedStructureSize - 1]; |
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$initialGroup = $this->groups[$index] ?? $this->groups[$initialStructureSize - 1]; |
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// Define if character group with higher priority |
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if (($return = $initialGroup->compare($comparedGroup)) !== 0) { |
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return $return; |
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} |
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} |
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// Structures are equal |
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return 0; |
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} |
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/** |
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* Get longest common prefix between strings. |
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* |
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* @param Structure $compared Compared character group structure |
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* |
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* @return string Strings Longest common prefix or empty string |
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* |
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*/ |
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public function getCommonPrefix(Structure $compared) |
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{ |
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$longestPrefix = ''; |
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/** @var AbstractCG $group Iterate longest structure character groups */ |
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foreach ($this->getShortestStructure($compared) as $index => $group) { |
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$initialGroup = $this->groups[$index]; |
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$comparedGroup = $compared->groups[$index]; |
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// Get longest matching prefix between character groups. |
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$prefix = $initialGroup->getCommonPrefix($comparedGroup); |
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// Concatenate common prefix |
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$longestPrefix .= $prefix; |
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/** |
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* If returned prefix is not equal to initial/compared character groups then it means |
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* that it is shorter and we need to stop searching. |
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*/ |
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if ($this->isStringNotMatchingAnyCG($prefix, $initialGroup, $comparedGroup)) { |
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break; |
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} |
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} |
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return $longestPrefix; |
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} |
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/** |
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* Define shortest structure. |
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* |
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* @param Structure $compared Structure to compare |
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* |
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* @return Structure Shortest structure |
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*/ |
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private function getShortestStructure(Structure $compared): Structure |
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{ |
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return $this->count() < $compared->count() ? $this : $compared; |
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} |
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/** |
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* Define if string does not match any of the passed character groups. |
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* |
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* @param string $string String for comparison |
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* @param AbstractCG $initialGroup Initial character group |
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* @param AbstractCG $comparedGroup Compared character group |
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* |
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* @return bool True if string not matching any of character groups |
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*/ |
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private function isStringNotMatchingAnyCG(string $string, AbstractCG $initialGroup, AbstractCG $comparedGroup): bool |
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{ |
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return $string !== $initialGroup->getString() || $string !== $comparedGroup->getString(); |
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} |
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/** |
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* @return string Structure input string |
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*/ |
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2 |
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public function getString(): string |
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{ |
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return $this->string; |
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} |
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} |
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samsonframework /
string-condition-tree
