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BinaryOperationExpression.php
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BinaryOperationExpression.php
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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\Expression;
use ScssPhp\ScssPhp\SourceSpan\FileSpan;
use ScssPhp\ScssPhp\Visitor\ExpressionVisitor;
/**
* A binary operator, as in `1 + 2` or `$this and $other`.
*
* @internal
*/
final class BinaryOperationExpression implements Expression
{
/**
* @var BinaryOperator::*
* @readonly
*/
private $operator;
/**
* @var Expression
* @readonly
*/
private $left;
/**
* @var Expression
* @readonly
*/
private $right;
/**
* Whether this is a dividedBy operation that may be interpreted as slash-separated numbers.
*
* @var bool
*/
private $allowsSlash = false;
/**
* @param BinaryOperator::* $operator
*/
public function __construct(string $operator, Expression $left, Expression $right)
{
$this->operator = $operator;
$this->left = $left;
$this->right = $right;
}
/**
* Creates a dividedBy operation that may be interpreted as slash-separated numbers.
*/
public static function slash(Expression $left, Expression $right): self
{
$operation = new self(BinaryOperator::DIVIDED_BY, $left, $right);
$operation->allowsSlash = true;
return $operation;
}
/**
* @return BinaryOperator::*
*/
public function getOperator(): string
{
return $this->operator;
}
public function getLeft(): Expression
{
return $this->left;
}
public function getRight(): Expression
{
return $this->right;
}
public function allowsSlash(): bool
{
return $this->allowsSlash;
}
public function getSpan(): FileSpan
{
$left = $this->left;
while ($left instanceof BinaryOperationExpression) {
$left = $left->left;
}
$right = $this->right;
while ($right instanceof BinaryOperationExpression) {
$right = $right->right;
}
$leftSpan = $left->getSpan();
$rightSpan = $right->getSpan();
return $leftSpan->expand($rightSpan);
}
public function accept(ExpressionVisitor $visitor)
{
return $visitor->visitBinaryOperationExpression($this);
}
public function __toString(): string
{
$buffer = '';
$leftNeedsParens = $this->left instanceof BinaryOperationExpression && BinaryOperator::getPrecedence($this->left->getOperator()) < BinaryOperator::getPrecedence($this->operator);
if ($leftNeedsParens) {
$buffer .= '(';
}
$buffer .= $this->left;
if ($leftNeedsParens) {
$buffer .= ')';
}
$buffer .= ' ';
$buffer .= $this->operator;
$buffer .= ' ';
$rightNeedsParens = $this->right instanceof BinaryOperationExpression && BinaryOperator::getPrecedence($this->right->getOperator()) <= BinaryOperator::getPrecedence($this->operator);
if ($rightNeedsParens) {
$buffer .= '(';
}
$buffer .= $this->right;
if ($rightNeedsParens) {
$buffer .= ')';
}
return $buffer;
}
}