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<?php |
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declare(strict_types=1); |
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namespace Doctrine\DBAL\Driver\OCI8; |
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use const PREG_OFFSET_CAPTURE; |
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use function count; |
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use function implode; |
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use function preg_match; |
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use function preg_quote; |
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use function substr; |
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/** |
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* Converts positional (?) into named placeholders (:param<num>). |
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* |
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* Oracle does not support positional parameters, hence this method converts all |
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* positional parameters into artificially named parameters. Note that this conversion |
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* is not perfect. All question marks (?) in the original statement are treated as |
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* placeholders and converted to a named parameter. |
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* |
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* @internal This class is not covered by the backward compatibility promise |
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*/ |
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final class ConvertPositionalToNamedPlaceholders |
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{ |
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/** |
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* @param string $statement The SQL statement to convert. |
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* |
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* @return mixed[] [0] => the statement value (string), [1] => the paramMap value (array). |
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* |
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* @throws OCI8Exception |
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*/ |
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public function __invoke(string $statement) : array |
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{ |
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$fragmentOffset = $tokenOffset = 0; |
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$fragments = $paramMap = []; |
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$currentLiteralDelimiter = null; |
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do { |
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if ($currentLiteralDelimiter === null) { |
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$result = $this->findPlaceholderOrOpeningQuote( |
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$statement, |
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$tokenOffset, |
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$fragmentOffset, |
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$fragments, |
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$currentLiteralDelimiter, |
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$paramMap |
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); |
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} else { |
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$result = $this->findClosingQuote($statement, $tokenOffset, $currentLiteralDelimiter); |
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} |
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} while ($result); |
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if ($currentLiteralDelimiter) { |
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throw NonTerminatedStringLiteral::new($tokenOffset - 1); |
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} |
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$fragments[] = substr($statement, $fragmentOffset); |
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$statement = implode('', $fragments); |
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return [$statement, $paramMap]; |
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} |
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/** |
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* Finds next placeholder or opening quote. |
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* |
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* @param string $statement The SQL statement to parse |
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* @param int $tokenOffset The offset to start searching from |
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* @param int $fragmentOffset The offset to build the next fragment from |
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* @param string[] $fragments Fragments of the original statement not containing placeholders |
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* @param string|null $currentLiteralDelimiter The delimiter of the current string literal |
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* or NULL if not currently in a literal |
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* @param string[] $paramMap Mapping of the original parameter positions to their named replacements |
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* |
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* @return bool Whether the token was found |
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*/ |
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private function findPlaceholderOrOpeningQuote( |
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string $statement, |
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int &$tokenOffset, |
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int &$fragmentOffset, |
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array &$fragments, |
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?string &$currentLiteralDelimiter, |
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array &$paramMap |
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) : bool { |
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$token = $this->findToken($statement, $tokenOffset, '/[?\'"]/'); |
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if (! $token) { |
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return false; |
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} |
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if ($token === '?') { |
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$position = count($paramMap) + 1; |
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$param = ':param' . $position; |
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$fragments[] = substr($statement, $fragmentOffset, $tokenOffset - $fragmentOffset); |
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$fragments[] = $param; |
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$paramMap[$position] = $param; |
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$tokenOffset += 1; |
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$fragmentOffset = $tokenOffset; |
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return true; |
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} |
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$currentLiteralDelimiter = $token; |
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++$tokenOffset; |
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return true; |
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} |
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/** |
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* Finds closing quote |
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* |
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* @param string $statement The SQL statement to parse |
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* @param int $tokenOffset The offset to start searching from |
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* @param string $currentLiteralDelimiter The delimiter of the current string literal |
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* |
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* @return bool Whether the token was found |
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*/ |
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private function findClosingQuote( |
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string $statement, |
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int &$tokenOffset, |
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string &$currentLiteralDelimiter |
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) : bool { |
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$token = $this->findToken( |
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$statement, |
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$tokenOffset, |
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'/' . preg_quote($currentLiteralDelimiter, '/') . '/' |
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); |
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if (! $token) { |
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return false; |
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} |
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$currentLiteralDelimiter = null; |
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++$tokenOffset; |
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return true; |
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} |
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/** |
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* Finds the token described by regex starting from the given offset. Updates the offset with the position |
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* where the token was found. |
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* |
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* @param string $statement The SQL statement to parse |
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* @param int $offset The offset to start searching from |
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* @param string $regex The regex containing token pattern |
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* |
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* @return string|null Token or NULL if not found |
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*/ |
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private function findToken(string $statement, int &$offset, string $regex) : ?string |
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{ |
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if (preg_match($regex, $statement, $matches, PREG_OFFSET_CAPTURE, $offset)) { |
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$offset = $matches[0][1]; |
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return $matches[0][0]; |
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} |
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return null; |
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} |
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} |
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doctrine /
dbal
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