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ListExpression.php
142 lines (119 loc) · 3.1 KB
/
ListExpression.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\Value\ListSeparator;
use ScssPhp\ScssPhp\Visitor\ExpressionVisitor;
/**
* A list literal.
*
* @internal
*/
final class ListExpression implements Expression
{
/**
* @var Expression[]
* @readonly
*/
private $contents;
/**
* @var ListSeparator::*
* @readonly
*/
private $separator;
/**
* @var FileSpan
* @readonly
*/
private $span;
/**
* @var bool
* @readonly
*/
private $brackets;
/**
* ListExpression constructor.
*
* @param Expression[] $contents
* @param ListSeparator::* $separator
*/
public function __construct(array $contents, string $separator, FileSpan $span, bool $brackets = false)
{
$this->contents = $contents;
$this->separator = $separator;
$this->span = $span;
$this->brackets = $brackets;
}
/**
* @return Expression[]
*/
public function getContents(): array
{
return $this->contents;
}
/**
* @return ListSeparator::*
*/
public function getSeparator(): string
{
return $this->separator;
}
public function hasBrackets(): bool
{
return $this->brackets;
}
public function getSpan(): FileSpan
{
return $this->span;
}
public function accept(ExpressionVisitor $visitor)
{
return $visitor->visitListExpression($this);
}
public function __toString(): string
{
$buffer = '';
if ($this->hasBrackets()) {
$buffer .= '[';
}
$buffer .= implode($this->separator === ListSeparator::COMMA ? ', ' : ' ', array_map(function ($element) {
return $this->elementNeedsParens($element) ? "($element)" : (string) $element;
}, $this->contents));
if ($this->hasBrackets()) {
$buffer .= ']';
}
return $buffer;
}
/**
* Returns whether $expression, contained in $this, needs parentheses when
* printed as Sass source.
*/
private function elementNeedsParens(Expression $expression): bool
{
if ($expression instanceof ListExpression) {
if (\count($expression->contents) < 2) {
return false;
}
if ($expression->brackets) {
return false;
}
return $this->separator === ListSeparator::COMMA ? $expression->separator === ListSeparator::COMMA : $expression->separator !== ListSeparator::UNDECIDED;
}
if ($this->separator !== ListSeparator::SPACE) {
return false;
}
if ($expression instanceof UnaryOperationExpression) {
return $expression->getOperator() === UnaryOperator::PLUS || $expression->getOperator() === UnaryOperator::MINUS;
}
return false;
}
}