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<?php
/**
* SCSSPHP
*
* @copyright 2012-2020 Leaf Corcoran
*
* @license http://opensource.org/licenses/MIT MIT
*
* @link http://scssphp.github.io/scssphp
*/
namespace ScssPhp\ScssPhp\Ast\Sass\Expression;
use ScssPhp\ScssPhp\Ast\Sass\ArgumentDeclaration;
use ScssPhp\ScssPhp\Ast\Sass\ArgumentInvocation;
use ScssPhp\ScssPhp\Ast\Sass\CallableInvocation;
use ScssPhp\ScssPhp\Ast\Sass\Expression;
use ScssPhp\ScssPhp\SourceSpan\FileSpan;
use ScssPhp\ScssPhp\Visitor\ExpressionVisitor;
/**
* A ternary expression.
*
* This is defined as a separate syntactic construct rather than a normal
* function because only one of the `$if-true` and `$if-false` arguments are
* evaluated.
*
* @internal
*/
final class IfExpression implements Expression, CallableInvocation
{
/**
* The arguments passed to `if()`.
*
* @var ArgumentInvocation
* @readonly
*/
private $arguments;
/**
* @var FileSpan
* @readonly
*/
private $span;
/**
* @var ArgumentDeclaration|null
*/
private static $declaration;
public function __construct(ArgumentInvocation $arguments, FileSpan $span)
{
$this->span = $span;
$this->arguments = $arguments;
}
/**
* The declaration of `if()`, as though it were a normal function.
*/
public static function getDeclaration(): ArgumentDeclaration
{
if (self::$declaration === null) {
self::$declaration = ArgumentDeclaration::parse('@function if($condition, $if-true, $if-false) {');
}
return self::$declaration;
}
public function getArguments(): ArgumentInvocation
{
return $this->arguments;
}
public function getSpan(): FileSpan
{
return $this->span;
}
public function accept(ExpressionVisitor $visitor)
{
return $visitor->visitIfExpression($this);
}
public function __toString(): string
{
return 'if' . $this->arguments;
}
}
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