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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Db\Pgsql\Query; |
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/** |
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* The class converts Postgres SQL array representation to PHP array |
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*/ |
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class ArrayParser |
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{ |
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/** |
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* @var string Character used in array |
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*/ |
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private string $delimiter = ','; |
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/** |
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* Convert array from PostgreSQL to PHP |
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* |
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* @param string $value string to be converted |
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* |
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* @return array|null |
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*/ |
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public function parse($value): ?array |
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{ |
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if ($value === null) { |
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return null; |
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} |
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if ($value === '{}') { |
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return []; |
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} |
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return $this->parseArray($value); |
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} |
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/** |
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* Pares PgSQL array encoded in string |
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* |
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* @param string $value |
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* @param int $i parse starting position |
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* |
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* @return array |
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*/ |
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private function parseArray($value, &$i = 0): array |
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{ |
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$result = []; |
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$len = \strlen($value); |
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for (++$i; $i < $len; ++$i) { |
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switch ($value[$i]) { |
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case '{': |
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$result[] = $this->parseArray($value, $i); |
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break; |
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case '}': |
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break 2; |
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case $this->delimiter: |
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if (empty($result)) { // `{}` case |
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$result[] = null; |
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} |
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if (\in_array($value[$i + 1], [$this->delimiter, '}'], true)) { // `{,}` case |
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$result[] = null; |
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} |
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break; |
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default: |
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$result[] = $this->parseString($value, $i); |
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} |
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} |
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return $result; |
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} |
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/** |
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* Parses PgSQL encoded string |
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* |
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* @param string $value |
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* @param int $i parse starting position |
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* |
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* @return null|string |
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*/ |
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private function parseString($value, &$i): ?string |
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{ |
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$isQuoted = $value[$i] === '"'; |
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$stringEndChars = $isQuoted ? ['"'] : [$this->delimiter, '}']; |
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$result = ''; |
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$len = strlen($value); |
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for ($i += $isQuoted ? 1 : 0; $i < $len; ++$i) { |
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if (\in_array($value[$i], ['\\', '"'], true) && \in_array($value[$i + 1], [$value[$i], '"'], true)) { |
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++$i; |
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} elseif (\in_array($value[$i], $stringEndChars, true)) { |
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break; |
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} |
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$result .= $value[$i]; |
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} |
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$i -= $isQuoted ? 0 : 1; |
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if (!$isQuoted && $result === 'NULL') { |
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$result = null; |
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} |
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return $result; |
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} |
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} |
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yiisoft /
db-pgsql
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