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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,242 @@ | ||
| <?php | ||
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| declare(strict_types=1); | ||
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| namespace Yiisoft\Db\Expression; | ||
|
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| use Yiisoft\Db\Command\Param; | ||
| use Yiisoft\Db\Connection\ConnectionInterface; | ||
| use Yiisoft\Db\QueryBuilder\QueryBuilderInterface; | ||
| use Yiisoft\Db\Syntax\AbstractSqlParser; | ||
|
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| use function array_merge; | ||
| use function count; | ||
| use function strlen; | ||
| use function substr; | ||
| use function substr_replace; | ||
|
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| /** | ||
| * It's used to build expressions for use in database queries. | ||
| * | ||
| * It provides a {@see build()} method for creating various types of expressions, such as conditions, joins, and | ||
| * ordering clauses. | ||
| * | ||
| * These expressions can be used with the query builder to build complex and customizable database queries | ||
| * {@see Expression} class. | ||
| * | ||
| * @psalm-import-type ParamsType from ConnectionInterface | ||
| */ | ||
| abstract class AbstractExpressionBuilder implements ExpressionBuilderInterface | ||
| { | ||
| public function __construct(private QueryBuilderInterface $queryBuilder) | ||
| { | ||
| } | ||
|
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| /** | ||
| * Builds an SQL expression from the given expression object. | ||
| * | ||
| * This method is called by the query builder to build SQL expressions from {@see ExpressionInterface} objects. | ||
| * | ||
| * @param Expression $expression The expression to build. | ||
| * @param array $params The parameters to be bound to the query. | ||
| * | ||
| * @psalm-param ParamsType $params | ||
| * | ||
| * @return string SQL expression. | ||
| */ | ||
| public function build(ExpressionInterface $expression, array &$params = []): string | ||
| { | ||
| $sql = $expression->__toString(); | ||
| $expressionParams = $expression->getParams(); | ||
|
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| if (empty($expressionParams)) { | ||
| return $sql; | ||
| } | ||
|
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| if (isset($expressionParams[0])) { | ||
| $params = array_merge($params, $expressionParams); | ||
| return $sql; | ||
| } | ||
|
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| $nonUniqueReplacements = $this->appendParams($expressionParams, $params); | ||
| $expressionReplacements = $this->buildParamExpressions($expressionParams, $params); | ||
|
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| $replacements = $this->mergeReplacements($nonUniqueReplacements, $expressionReplacements); | ||
|
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| if (empty($replacements)) { | ||
| return $sql; | ||
| } | ||
|
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| return $this->replacePlaceholders($sql, $replacements); | ||
| } | ||
|
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| /** | ||
| * Appends parameters to the list of query parameters replacing non-unique parameters with unique ones. | ||
| * | ||
| * @param array $expressionParams Parameters to be appended. | ||
| * @param array $params Parameters to be bound to the query. | ||
| * | ||
| * @psalm-param ParamsType $expressionParams | ||
| * @psalm-param ParamsType $params | ||
| * | ||
| * @return string[] Replacements for non-unique parameters. | ||
| */ | ||
| private function appendParams(array &$expressionParams, array &$params): array | ||
| { | ||
| $nonUniqueParams = []; | ||
|
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| /** @var non-empty-string $name */ | ||
| foreach ($expressionParams as $name => $value) { | ||
| $paramName = $name[0] === ':' ? substr($name, 1) : $name; | ||
|
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| if (!isset($params[$paramName]) && !isset($params[":$paramName"])) { | ||
| $params[$name] = $value; | ||
| continue; | ||
| } | ||
|
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| $nonUniqueParams[$name] = $value; | ||
| } | ||
|
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| $replacements = []; | ||
|
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| /** @var non-empty-string $name */ | ||
| foreach ($nonUniqueParams as $name => $value) { | ||
| $paramName = $name[0] === ':' ? substr($name, 1) : $name; | ||
| $uniqueName = $this->getUniqueName($paramName, $params); | ||
|
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| $replacements[":$paramName"] = ":$uniqueName"; | ||
|
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| if ($name[0] === ':') { | ||
| $uniqueName = ":$uniqueName"; | ||
| } | ||
|
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| $params[$uniqueName] = $value; | ||
| $expressionParams[$uniqueName] = $value; | ||
| unset($expressionParams[$name]); | ||
| } | ||
|
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| return $replacements; | ||
| } | ||
|
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| /** | ||
| * Build expression values of parameters. | ||
| * | ||
| * @param array $expressionParams Parameters from the expression. | ||
| * @param array $params Parameters to be bound to the query. | ||
| * | ||
| * @psalm-param ParamsType $expressionParams | ||
| * @psalm-param ParamsType $params | ||
| * | ||
| * @return string[] Replacements for parameters. | ||
| */ | ||
| private function buildParamExpressions(array $expressionParams, array &$params): array | ||
| { | ||
| $replacements = []; | ||
|
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| /** @var non-empty-string $name */ | ||
| foreach ($expressionParams as $name => $value) { | ||
| if (!$value instanceof ExpressionInterface || $value instanceof Param) { | ||
| continue; | ||
| } | ||
|
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| $placeholder = $name[0] !== ':' ? ":$name" : $name; | ||
| $replacements[$placeholder] = $this->queryBuilder->buildExpression($value, $params); | ||
|
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| /** @psalm-var ParamsType $params */ | ||
| unset($params[$name]); | ||
| } | ||
|
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| return $replacements; | ||
| } | ||
|
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| /** | ||
| * Merges replacements for non-unique parameters with replacements for expression parameters. | ||
| * | ||
| * @param string[] $replacements Replacements for non-unique parameters. | ||
| * @param string[] $expressionReplacements Replacements for expression parameters. | ||
| * | ||
| * @return string[] Merged replacements. | ||
| */ | ||
| private function mergeReplacements(array $replacements, array $expressionReplacements): array | ||
| { | ||
| if (empty($replacements)) { | ||
| return $expressionReplacements; | ||
| } | ||
|
|
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| if (empty($expressionReplacements)) { | ||
| return $replacements; | ||
| } | ||
|
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| /** @var non-empty-string $value */ | ||
| foreach ($replacements as $name => $value) { | ||
| if (isset($expressionReplacements[$value])) { | ||
| $replacements[$name] = $expressionReplacements[$value]; | ||
| unset($expressionReplacements[$value]); | ||
| } | ||
| } | ||
|
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| return $replacements + $expressionReplacements; | ||
| } | ||
|
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| /** | ||
| * Returns a unique name for the parameter without colon at the beginning. | ||
| * | ||
| * @param string $name Name of the parameter without colon at the beginning. | ||
| * @param array $params Parameters to be bound to the query. | ||
| * | ||
| * @psalm-param ParamsType $params | ||
| * | ||
| * @return string Unique name of the parameter with colon at the beginning. | ||
| * | ||
| * @psalm-return non-empty-string | ||
| */ | ||
| private function getUniqueName(string $name, array $params): string | ||
| { | ||
| $uniqueName = $name . '_0'; | ||
|
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| for ($i = 1; isset($params[$uniqueName]) || isset($params[":$uniqueName"]); ++$i) { | ||
| $uniqueName = $name . '_' . $i; | ||
| } | ||
|
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| return $uniqueName; | ||
| } | ||
|
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| /** | ||
| * Replaces placeholders with replacements in a SQL expression. | ||
| * | ||
| * @param string $sql SQL expression where the placeholder should be replaced. | ||
| * @param string[] $replacements Replacements for placeholders. | ||
| * | ||
| * @return string SQL expression with replaced placeholders. | ||
| */ | ||
| private function replacePlaceholders(string $sql, array $replacements): string | ||
| { | ||
| $parser = $this->createSqlParser($sql); | ||
| $offset = 0; | ||
|
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| while (null !== $placeholder = $parser->getNextPlaceholder($position)) { | ||
| if (isset($replacements[$placeholder])) { | ||
| /** @var int $position */ | ||
| $sql = substr_replace($sql, $replacements[$placeholder], $position + $offset, strlen($placeholder)); | ||
|
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| if (count($replacements) === 1) { | ||
| break; | ||
| } | ||
|
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| $offset += strlen($replacements[$placeholder]) - strlen($placeholder); | ||
| unset($replacements[$placeholder]); | ||
| } | ||
| } | ||
|
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| return $sql; | ||
| } | ||
|
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| /** | ||
| * Creates an instance of {@see AbstractSqlParser} for the given SQL expression. | ||
| * | ||
| * @param string $sql SQL expression to be parsed. | ||
| * | ||
| * @return AbstractSqlParser SQL parser instance. | ||
| */ | ||
| abstract protected function createSqlParser(string $sql): AbstractSqlParser; | ||
| } |
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