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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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/** |
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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 IterableStructure |
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{ |
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/** array Supported character group types */ |
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const CG_TYPES = [ |
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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 string Input string */ |
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public $input; |
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/** |
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* Create string character group structure from input 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->input = $input; |
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// Iterate until input is cleared |
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while (strlen($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)) instanceof NullCG) { |
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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, $comparedStructureSize); |
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// Iterate maximum sized structure |
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for ($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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// Define shortest structure |
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$shortestStructure = $this->count() < $compared->count() ? $this : $compared; |
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/** @var AbstractCG $group Iterate longest structure character groups */ |
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foreach ($shortestStructure 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 .= $prefix; |
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/** |
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* If returned prefix is not equal to initial/compared character groups then it means |
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* that it is shorter and we need to stop searching. |
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*/ |
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if ($prefix !== $initialGroup->getString() || $prefix !== $comparedGroup->getString()) { |
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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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samsonframework /
string-condition-tree
