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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Db\Pgsql; |
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use function in_array; |
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/** |
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* Structured type representation to PHP array parser for PostgreSQL Server. |
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*/ |
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final class StructuredParser |
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{ |
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/** |
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* Converts structured (composite) type value from PostgreSQL to PHP array |
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* |
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* @param string $value String to convert. |
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*/ |
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public function parse(string $value): array|null |
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{ |
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if ($value[0] !== '(') { |
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return null; |
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} |
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return $this->parseComposite($value); |
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} |
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/** |
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* Parses PostgreSQL composite type value encoded in string. |
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* |
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* @param string $value String to parse. |
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*/ |
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private function parseComposite(string $value): array |
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{ |
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for ($result = [], $i = 1;; ++$i) { |
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$result[] = match ($value[$i]) { |
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',', ')' => null, |
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'"' => $this->parseQuotedString($value, $i), |
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default => $this->parseUnquotedString($value, $i), |
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}; |
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if ($value[$i] === ')') { |
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return $result; |
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} |
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} |
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} |
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/** |
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* Parses quoted string. |
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*/ |
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private function parseQuotedString(string $value, int &$i): string |
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{ |
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for ($result = '', ++$i;; ++$i) { |
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if ($value[$i] === '\\') { |
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++$i; |
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} elseif ($value[$i] === '"') { |
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++$i; |
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return $result; |
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} |
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$result .= $value[$i]; |
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} |
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} |
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/** |
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* Parses unquoted string. |
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*/ |
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private function parseUnquotedString(string $value, int &$i): string |
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{ |
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for ($result = '';; ++$i) { |
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if (in_array($value[$i], [',', ')'], true)) { |
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return $result; |
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} |
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$result .= $value[$i]; |
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} |
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} |
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} |
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For hinted functions/methods where all return statements with the correct type are only reachable via conditions, ?null? gets implicitly returned which may be incompatible with the hinted type. Let?s take a look at an example: