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<?php |
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namespace Staudenmeir\LaravelAdjacencyList\Query\Grammars; |
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use Illuminate\Database\Query\Builder; |
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use Illuminate\Database\Query\Grammars\PostgresGrammar as Base; |
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class PostgresGrammar extends Base implements ExpressionGrammar |
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{ |
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use OrdersByPath; |
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/** |
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* Compile an initial path. |
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* |
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* @param string $column |
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* @param string $alias |
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* @return string |
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*/ |
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public function compileInitialPath($column, $alias) |
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{ |
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if (is_string($column) && $this->model->isIntegerAttribute($column)) { |
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return 'array['.$this->wrap($column).'] as '.$this->wrap($alias); |
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} |
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return 'array[('.$this->wrap($column)." || '')::varchar] as ".$this->wrap($alias); |
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} |
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/** |
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* Compile a recursive path. |
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* |
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* @param string $column |
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* @param string $alias |
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* @param bool $reverse |
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* @return string |
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*/ |
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public function compileRecursivePath($column, $alias, bool $reverse = false) |
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{ |
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$wrappedColumn = $this->wrap($column); |
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$wrappedAlias = $this->wrap($alias); |
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if (is_string($column) && !$this->model->isIntegerAttribute($column)) { |
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$wrappedColumn .= '::varchar'; |
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} |
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return $reverse ? "$wrappedColumn || $wrappedAlias" : "$wrappedAlias || $wrappedColumn"; |
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} |
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/** |
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* Get the recursive path bindings. |
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* |
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* @param string $separator |
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* @return array |
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*/ |
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public function getRecursivePathBindings($separator) |
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{ |
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return []; |
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} |
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/** |
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* Select a concatenated list of paths. |
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* |
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* @param \Illuminate\Database\Query\Builder $query |
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* @param string $expression |
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* @param string $column |
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* @param string $pathSeparator |
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* @param string $listSeparator |
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* @return \Illuminate\Database\Query\Builder |
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*/ |
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public function selectPathList(Builder $query, $expression, $column, $pathSeparator, $listSeparator) |
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{ |
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return $query->selectRaw( |
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'string_agg(array_to_string('.$this->wrap($column).', ?), ?)', |
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[$pathSeparator, $listSeparator] |
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)->from($expression); |
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} |
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/** |
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* Compile a pivot column null value. |
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* |
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* @param string $typeName |
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* @param string $type |
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* @return string |
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*/ |
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public function compilePivotColumnNullValue(string $typeName, string $type): string |
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{ |
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$cast = match ($typeName) { |
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'datetime' => 'timestamp', |
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'string' => 'varchar', |
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default => $typeName, |
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}; |
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return "null::$cast"; |
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} |
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/** |
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* Compile a cycle detection clause. |
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* |
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* @param string $localKey |
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* @param string $path |
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* @return string |
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*/ |
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public function compileCycleDetection(string $localKey, string $path): string |
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{ |
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$wrappedLocalKey = $this->wrap($localKey); |
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$wrappedPath = $this->wrap($path); |
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if ($this->model->isIntegerAttribute($localKey)) { |
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return "$wrappedLocalKey = any($wrappedPath)"; |
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} |
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return "$wrappedLocalKey::varchar = any($wrappedPath)"; |
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} |
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/** |
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* Get the cycle detection bindings. |
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* |
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* @param string $pathSeparator |
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* @return array |
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*/ |
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public function getCycleDetectionBindings(string $pathSeparator): array |
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{ |
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return []; |
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} |
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/** |
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* Compile the initial select expression for a cycle detection clause. |
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* |
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* @param string $column |
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* @return string |
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*/ |
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public function compileCycleDetectionInitialSelect(string $column): string |
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{ |
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return 'false as ' . $this->wrap($column); |
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} |
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/** |
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* Compile the recursive select expression for a cycle detection clause. |
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* |
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* @param string $sql |
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* @param string $column |
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* @return string |
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*/ |
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public function compileCycleDetectionRecursiveSelect(string $sql, string $column): string |
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{ |
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return $sql; |
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} |
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/** |
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* Compile the stop constraint for a cycle detection clause. |
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* |
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* @param string $column |
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* @return string |
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*/ |
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public function compileCycleDetectionStopConstraint(string $column): string |
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{ |
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return 'not ' . $this->wrap($column); |
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} |
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/** |
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* Determine whether the database supports the UNION operator in a recursive expression. |
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* |
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* @return bool |
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*/ |
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public function supportsUnionInRecursiveExpression(): bool |
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{ |
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return true; |
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} |
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} |
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staudenmeir /
laravel-adjacency-list
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