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<?php
declare(strict_types=1);
namespace Doctrine\ORM\Query;
use function str_repeat;
/**
* A parse tree printer for Doctrine Query Language parser.
*
* @link http://www.phpdoctrine.org
*/
class Printer
{
/**
* Current indentation level
*
* @var int
*/
protected $_indent = 0;
/**
* Defines whether parse tree is printed (default, false) or not (true).
*
* @var bool
*/
protected $_silent;
/**
* Constructs a new parse tree printer.
*
* @param bool $silent Parse tree will not be printed if true.
*/
public function __construct($silent = false)
{
$this->_silent = $silent;
}
/**
* Prints an opening parenthesis followed by production name and increases
* indentation level by one.
*
* This method is called before executing a production.
*
* @param string $name Production name.
*
* @return void
*/
public function startProduction($name)
{
$this->println('(' . $name);
$this->_indent++;
}
/**
* Decreases indentation level by one and prints a closing parenthesis.
*
* This method is called after executing a production.
*
* @return void
*/
public function endProduction()
{
$this->_indent--;
$this->println(')');
}
/**
* Prints text indented with spaces depending on current indentation level.
*
* @param string $str The text.
*
* @return void
*/
public function println($str)
{
if (! $this->_silent) {
echo str_repeat(' ', $this->_indent), $str, "\n";
}
}
}
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