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<?php |
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namespace Ivory\Query; |
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use Ivory\Lang\Sql\ISqlSortExpression; |
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use Ivory\Lang\SqlPattern\SqlPattern; |
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use Ivory\Type\ITypeDictionary; |
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class SortedRelationDefinition extends RelationDefinition implements IRelationDefinition |
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{ |
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private $baseRelDef; |
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private $sortExpr; |
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private $args; |
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/** |
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* @param IRelationDefinition $relationDefinition definition of relation to constrain |
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* @param ISqlSortExpression|SqlPattern|string|array $sortExpr |
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* @param array $args |
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*/ |
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public function __construct(IRelationDefinition $relationDefinition, $sortExpr, ...$args) |
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{ |
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if ($args) { |
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if (is_array($sortExpr)) { |
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throw new \InvalidArgumentException('$args not supported for array of sort expressions'); |
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} elseif ($sortExpr instanceof ISqlSortExpression) { |
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throw new \InvalidArgumentException( |
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'$args not supported for ' . ISqlSortExpression::class . ' sort expression' |
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); |
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} |
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} |
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$this->baseRelDef = $relationDefinition; |
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$this->sortExpr = $sortExpr; |
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$this->args = $args; |
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} |
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public function toSql(ITypeDictionary $typeDictionary): string |
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{ |
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$relSql = $this->baseRelDef->toSql($typeDictionary); |
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$sortSql = self::getSortSql($typeDictionary, $this->sortExpr, ...$this->args); |
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if ($sortSql !== null) { |
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return "SELECT *\nFROM (\n$relSql\n) t\nORDER BY $sortSql"; |
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} else { |
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return $relSql; |
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} |
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} |
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private static function getSortSql(ITypeDictionary $typeDictionary, $expr, ...$args) // PHP 7.1: declare returning ?string |
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{ |
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if ($expr instanceof ISqlSortExpression) { |
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$sortSql = $expr->getExpression()->getSql(); |
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switch ($expr->getDirection()) { |
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case ISqlSortExpression::ASC: |
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break; |
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case ISqlSortExpression::DESC: |
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$sortSql .= ' DESC'; |
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break; |
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default: |
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throw new \LogicException("Unexpected direction of sort expression: {$expr->getDirection()}"); |
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} |
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return $sortSql; |
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} elseif (is_array($expr)) { |
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$sqlParts = []; |
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foreach ($expr as $sortSpec) { |
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if (is_array($sortSpec)) { |
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$sqlPart = self::getSortSql($typeDictionary, ...$sortSpec); |
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} else { |
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$sqlPart = self::getSortSql($typeDictionary, $sortSpec); |
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} |
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if ($sqlPart !== null) { |
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$sqlParts[] = $sqlPart; |
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} |
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} |
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return ($sqlParts ? implode(', ', $sqlParts) : null); |
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} else { |
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$sortDef = SqlRelationDefinition::fromPattern($expr, ...$args); |
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return $sortDef->toSql($typeDictionary); |
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} |
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} |
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} |
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ondrej-bouda /
ivory
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.