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Filename : Postgres.php
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<?php

declare (strict_types=1);
/**
 * CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
 * Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 * @link          https://cakephp.org CakePHP(tm) Project
 * @since         3.0.0
 * @license       https://opensource.org/licenses/mit-license.php MIT License
 */
namespace WPToolkitDependenciesIsolationPrefix\Cake\Database\Driver;

use WPToolkitDependenciesIsolationPrefix\Cake\Database\Driver;
use WPToolkitDependenciesIsolationPrefix\Cake\Database\Expression\FunctionExpression;
use WPToolkitDependenciesIsolationPrefix\Cake\Database\Expression\IdentifierExpression;
use WPToolkitDependenciesIsolationPrefix\Cake\Database\Expression\StringExpression;
use WPToolkitDependenciesIsolationPrefix\Cake\Database\PostgresCompiler;
use WPToolkitDependenciesIsolationPrefix\Cake\Database\Query;
use WPToolkitDependenciesIsolationPrefix\Cake\Database\QueryCompiler;
use WPToolkitDependenciesIsolationPrefix\Cake\Database\Schema\PostgresSchemaDialect;
use WPToolkitDependenciesIsolationPrefix\Cake\Database\Schema\SchemaDialect;
use PDO;
/**
 * Class Postgres
 */
class Postgres extends Driver
{
    use SqlDialectTrait;
    /**
     * @inheritDoc
     */
    protected const MAX_ALIAS_LENGTH = 63;
    /**
     * Base configuration settings for Postgres driver
     *
     * @var array<string, mixed>
     */
    protected $_baseConfig = ['persistent' => \true, 'host' => 'localhost', 'username' => 'root', 'password' => '', 'database' => 'cake', 'schema' => 'public', 'port' => 5432, 'encoding' => 'utf8', 'timezone' => null, 'flags' => [], 'init' => []];
    /**
     * The schema dialect class for this driver
     *
     * @var \Cake\Database\Schema\PostgresSchemaDialect|null
     */
    protected $_schemaDialect;
    /**
     * String used to start a database identifier quoting to make it safe
     *
     * @var string
     */
    protected $_startQuote = '"';
    /**
     * String used to end a database identifier quoting to make it safe
     *
     * @var string
     */
    protected $_endQuote = '"';
    /**
     * Establishes a connection to the database server
     *
     * @return bool true on success
     */
    public function connect() : bool
    {
        if ($this->_connection) {
            return \true;
        }
        $config = $this->_config;
        $config['flags'] += [PDO::ATTR_PERSISTENT => $config['persistent'], PDO::ATTR_EMULATE_PREPARES => \false, PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION];
        if (empty($config['unix_socket'])) {
            $dsn = "pgsql:host={$config['host']};port={$config['port']};dbname={$config['database']}";
        } else {
            $dsn = "pgsql:dbname={$config['database']}";
        }
        $this->_connect($dsn, $config);
        $this->_connection = $connection = $this->getConnection();
        if (!empty($config['encoding'])) {
            $this->setEncoding($config['encoding']);
        }
        if (!empty($config['schema'])) {
            $this->setSchema($config['schema']);
        }
        if (!empty($config['timezone'])) {
            $config['init'][] = \sprintf('SET timezone = %s', $connection->quote($config['timezone']));
        }
        foreach ($config['init'] as $command) {
            $connection->exec($command);
        }
        return \true;
    }
    /**
     * Returns whether php is able to use this driver for connecting to database
     *
     * @return bool true if it is valid to use this driver
     */
    public function enabled() : bool
    {
        return \in_array('pgsql', PDO::getAvailableDrivers(), \true);
    }
    /**
     * @inheritDoc
     */
    public function schemaDialect() : SchemaDialect
    {
        if ($this->_schemaDialect === null) {
            $this->_schemaDialect = new PostgresSchemaDialect($this);
        }
        return $this->_schemaDialect;
    }
    /**
     * Sets connection encoding
     *
     * @param string $encoding The encoding to use.
     * @return void
     */
    public function setEncoding(string $encoding) : void
    {
        $this->connect();
        $this->_connection->exec('SET NAMES ' . $this->_connection->quote($encoding));
    }
    /**
     * Sets connection default schema, if any relation defined in a query is not fully qualified
     * postgres will fallback to looking the relation into defined default schema
     *
     * @param string $schema The schema names to set `search_path` to.
     * @return void
     */
    public function setSchema(string $schema) : void
    {
        $this->connect();
        $this->_connection->exec('SET search_path TO ' . $this->_connection->quote($schema));
    }
    /**
     * @inheritDoc
     */
    public function disableForeignKeySQL() : string
    {
        return 'SET CONSTRAINTS ALL DEFERRED';
    }
    /**
     * @inheritDoc
     */
    public function enableForeignKeySQL() : string
    {
        return 'SET CONSTRAINTS ALL IMMEDIATE';
    }
    /**
     * @inheritDoc
     */
    public function supports(string $feature) : bool
    {
        switch ($feature) {
            case static::FEATURE_CTE:
            case static::FEATURE_JSON:
            case static::FEATURE_TRUNCATE_WITH_CONSTRAINTS:
            case static::FEATURE_WINDOW:
                return \true;
            case static::FEATURE_DISABLE_CONSTRAINT_WITHOUT_TRANSACTION:
                return \false;
        }
        return parent::supports($feature);
    }
    /**
     * @inheritDoc
     */
    public function supportsDynamicConstraints() : bool
    {
        return \true;
    }
    /**
     * @inheritDoc
     */
    protected function _transformDistinct(Query $query) : Query
    {
        return $query;
    }
    /**
     * @inheritDoc
     */
    protected function _insertQueryTranslator(Query $query) : Query
    {
        if (!$query->clause('epilog')) {
            $query->epilog('RETURNING *');
        }
        return $query;
    }
    /**
     * @inheritDoc
     */
    protected function _expressionTranslators() : array
    {
        return [IdentifierExpression::class => '_transformIdentifierExpression', FunctionExpression::class => '_transformFunctionExpression', StringExpression::class => '_transformStringExpression'];
    }
    /**
     * Changes identifer expression into postgresql format.
     *
     * @param \Cake\Database\Expression\IdentifierExpression $expression The expression to tranform.
     * @return void
     */
    protected function _transformIdentifierExpression(IdentifierExpression $expression) : void
    {
        $collation = $expression->getCollation();
        if ($collation) {
            // use trim() to work around expression being transformed multiple times
            $expression->setCollation('"' . \trim($collation, '"') . '"');
        }
    }
    /**
     * Receives a FunctionExpression and changes it so that it conforms to this
     * SQL dialect.
     *
     * @param \Cake\Database\Expression\FunctionExpression $expression The function expression to convert
     *   to postgres SQL.
     * @return void
     */
    protected function _transformFunctionExpression(FunctionExpression $expression) : void
    {
        switch ($expression->getName()) {
            case 'CONCAT':
                // CONCAT function is expressed as exp1 || exp2
                $expression->setName('')->setConjunction(' ||');
                break;
            case 'DATEDIFF':
                $expression->setName('')->setConjunction('-')->iterateParts(function ($p) {
                    if (\is_string($p)) {
                        $p = ['value' => [$p => 'literal'], 'type' => null];
                    } else {
                        $p['value'] = [$p['value']];
                    }
                    return new FunctionExpression('DATE', $p['value'], [$p['type']]);
                });
                break;
            case 'CURRENT_DATE':
                $time = new FunctionExpression('LOCALTIMESTAMP', [' 0 ' => 'literal']);
                $expression->setName('CAST')->setConjunction(' AS ')->add([$time, 'date' => 'literal']);
                break;
            case 'CURRENT_TIME':
                $time = new FunctionExpression('LOCALTIMESTAMP', [' 0 ' => 'literal']);
                $expression->setName('CAST')->setConjunction(' AS ')->add([$time, 'time' => 'literal']);
                break;
            case 'NOW':
                $expression->setName('LOCALTIMESTAMP')->add([' 0 ' => 'literal']);
                break;
            case 'RAND':
                $expression->setName('RANDOM');
                break;
            case 'DATE_ADD':
                $expression->setName('')->setConjunction(' + INTERVAL')->iterateParts(function ($p, $key) {
                    if ($key === 1) {
                        $p = \sprintf("'%s'", $p);
                    }
                    return $p;
                });
                break;
            case 'DAYOFWEEK':
                $expression->setName('EXTRACT')->setConjunction(' ')->add(['DOW FROM' => 'literal'], [], \true)->add([') + (1' => 'literal']);
                // Postgres starts on index 0 but Sunday should be 1
                break;
        }
    }
    /**
     * Changes string expression into postgresql format.
     *
     * @param \Cake\Database\Expression\StringExpression $expression The string expression to tranform.
     * @return void
     */
    protected function _transformStringExpression(StringExpression $expression) : void
    {
        // use trim() to work around expression being transformed multiple times
        $expression->setCollation('"' . \trim($expression->getCollation(), '"') . '"');
    }
    /**
     * {@inheritDoc}
     *
     * @return \Cake\Database\PostgresCompiler
     */
    public function newCompiler() : QueryCompiler
    {
        return new PostgresCompiler();
    }
}