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<?php |
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declare(strict_types=1); |
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namespace MartinGeorgiev\Utils; |
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/** |
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* Util class with helpers for working with PostgreSQL data structures. |
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* |
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* @since 0.9 |
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* |
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* @author Martin Georgiev <[email protected]> |
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*/ |
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class DataStructure |
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{ |
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private const POSTGRESQL_EMPTY_ARRAY = '{}'; |
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private const POSTGRESQL_NULL_VALUE = 'null'; |
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/** |
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* This method supports only single-dimensioned text arrays and |
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* relays on the default escaping strategy in PostgreSQL (double quotes). |
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*/ |
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public static function transformPostgresTextArrayToPHPArray(string $postgresArray): array |
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{ |
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$trimmed = \trim($postgresArray); |
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if ($trimmed === '' || \strtolower($trimmed) === self::POSTGRESQL_NULL_VALUE) { |
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return []; |
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} |
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if (\str_contains($trimmed, '},{') || \str_starts_with($trimmed, '{{')) { |
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throw new \InvalidArgumentException('Only single-dimensioned arrays are supported'); |
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} |
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if ($trimmed === self::POSTGRESQL_EMPTY_ARRAY) { |
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return []; |
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} |
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$jsonArray = '['.\trim($trimmed, '{}').']'; |
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$decoded = \json_decode($jsonArray, true, 512, JSON_BIGINT_AS_STRING); |
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if ($decoded === null && \json_last_error() !== JSON_ERROR_NONE) { |
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throw new \InvalidArgumentException('Invalid array format: '.\json_last_error_msg()); |
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} |
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return \array_map( |
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static fn ($value): mixed => \is_string($value) ? self::unescapeString($value) : $value, |
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$decoded |
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); |
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} |
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/** |
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* This method supports only single-dimensioned PHP arrays. |
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* This method relays on the default escaping strategy in PostgreSQL (double quotes). |
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*/ |
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public static function transformPHPArrayToPostgresTextArray(array $phpArray): string |
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{ |
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if ($phpArray === []) { |
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return self::POSTGRESQL_EMPTY_ARRAY; |
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} |
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if (\array_filter($phpArray, 'is_array')) { |
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throw new \InvalidArgumentException('Only single-dimensioned arrays are supported'); |
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} |
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$processed = \array_map(static fn ($value): string => self::formatValue($value), $phpArray); |
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return '{'.\implode(',', $processed).'}'; |
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} |
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/** |
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* Formats a single value for PostgreSQL array. |
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*/ |
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private static function formatValue(mixed $value): string |
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{ |
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// Handle null |
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if ($value === null) { |
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return 'NULL'; |
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} |
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// Handle actual numbers |
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if (\is_int($value) || \is_float($value)) { |
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return (string) $value; |
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} |
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// Convert to string if not already |
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$stringValue = (string) $value; |
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// Handle empty string |
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if ($stringValue === '') { |
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return '""'; |
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} |
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if (self::isNumericSimple($stringValue)) { |
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return '"'.$stringValue.'"'; |
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} |
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// Double the backslashes and escape quotes |
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$escaped = \str_replace( |
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['\\', '"'], |
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['\\\\', '\"'], |
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$stringValue |
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); |
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return '"'.$escaped.'"'; |
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} |
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private static function isNumericSimple(string $value): bool |
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{ |
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// Fast path for obvious numeric strings |
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if ($value === '' || $value[0] === '"') { |
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return false; |
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} |
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// Handle scientific notation |
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$lower = \strtolower($value); |
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if (\str_contains($lower, 'e')) { |
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$value = \str_replace('e', '', $lower); |
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} |
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// Use built-in numeric check |
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return \is_numeric($value); |
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} |
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private static function unescapeString(string $value): string |
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{ |
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// First handle escaped quotes |
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$value = \str_replace('\"', '___QUOTE___', $value); |
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// Handle double backslashes |
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$value = \str_replace('\\\\', '___DBLBACK___', $value); |
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// Handle remaining single backslashes |
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$value = \str_replace('\\', '\\', $value); |
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// Restore double backslashes |
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$value = \str_replace('___DBLBACK___', '\\\\', $value); |
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// Finally restore quotes |
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return \str_replace('___QUOTE___', '"', $value); |
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} |
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} |
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martin-georgiev /
postgresql-for-doctrine
