<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
namespace Magento\Framework\DB\Platform;

use Magento\Framework\DB\Select;

/**
* Class Quote
*/
class Quote
{
/**
* @param string $identifier
* @return string
*/
public function quoteIdentifier($identifier)
{
return $this->quoteIdentifierAs($identifier);
}

/**
* @param string $identifier
* @param string|null $alias
* @return string
*/
public function quoteColumnAs($identifier, $alias = null)
{
return $this->quoteIdentifierAs($identifier, $alias);
}

/**
* @param string $identifier
* @param string|null $alias
* @return string
*/
public function quoteTableAs($identifier, $alias = null)
{
return $this->quoteIdentifierAs($identifier, $alias);
}

/**
* @param string $identifier
* @param string|null $alias
* @return string
* @SuppressWarnings(PHPMD.CyclomaticComplexity)
*/
protected function quoteIdentifierAs($identifier, $alias = null)
{
if ($identifier instanceof \Zend_Db_Expr) {
$quoted = $identifier->__toString();
} elseif ($identifier instanceof \Magento\Framework\DB\Select) {
$quoted = '(' . $identifier->assemble() . ')';
} else {
if (is_string($identifier)) {
$identifier = explode('.', $identifier);
}
if (is_array($identifier)) {
$segments = [];
foreach ($identifier as $segment) {
if ($segment instanceof \Zend_Db_Expr) {
$segments[] = $segment->__toString();
} else {
$segments[] = $this->replaceQuoteSymbol($segment);
}
}
if ($alias !== null && end($identifier) == $alias) {
$alias = null;
}
$quoted = implode('.', $segments);
} else {
$quoted = $this->replaceQuoteSymbol($identifier);
}
}
if ($alias !== null) {
$quoted .= ' ' . Select::SQL_AS . ' ' . $this->replaceQuoteSymbol($alias);
}
return $quoted;
}

/**
* @param string $value
* @return string
*/
protected function replaceQuoteSymbol($value)
{
$symbol = $this->getQuoteIdentifierSymbol();
return ($symbol . str_replace("$symbol", "$symbol$symbol", $value) . $symbol);
}

/**
* @return string
*/
protected function getQuoteIdentifierSymbol()
{
return '`';
}
}