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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\Selector;
use ScssPhp\ScssPhp\Serializer\Serializer;
use ScssPhp\ScssPhp\Util\Equatable;
use ScssPhp\ScssPhp\Visitor\SelectorVisitor;
use ScssPhp\ScssPhp\Warn;
/**
* A node in the abstract syntax tree for a selector.
*
* This selector tree is mostly plain CSS, but also may contain a
* {@see ParentSelector} or a {@see PlaceholderSelector}.
*
* Selectors have structural equality semantics.
*/
abstract class Selector implements Equatable
{
/**
* Whether this selector, and complex selectors containing it, should not be
* emitted.
*/
public function isInvisible(): bool
{
return $this->accept(new IsInvisibleVisitor(true));
}
/**
* Whether this selector would be invisible even if it didn't have bogus
* combinators.
*/
public function isInvisibleOtherThanBogusCombinators(): bool
{
return $this->accept(new IsInvisibleVisitor(false));
}
/**
* Whether this selector is not valid CSS.
*
* This includes both selectors that are useful exclusively for build-time
* nesting (`> .foo)` and selectors with invalid combinators that are still
* supported for backwards-compatibility reasons (`.foo + ~ .bar`).
*/
public function isBogus(): bool
{
return $this->accept(new IsBogusVisitor(true));
}
/**
* Whether this selector is bogus other than having a leading combinator.
*/
public function isBogusOtherThanLeadingCombinator(): bool
{
return $this->accept(new IsBogusVisitor(false));
}
/**
* Whether this is a useless selector (that is, it's bogus _and_ it can't be
* transformed into valid CSS by `@extend` or nesting).
*/
public function isUseless(): bool
{
return $this->accept(new IsUselessVisitor());
}
/**
* Prints a warning if $this is a bogus selector.
*
* This may only be called from within a custom Sass function. This will
* throw a {@see SassScriptException} in a future major version.
*/
public function assertNotBogus(?string $name = null): void
{
if (!$this->isBogus()) {
return;
}
Warn::deprecation(($name === null ? '' : "\$$name: ") . "$this is not valid CSS.\nThis will be an error in Dart Sass 2.0.0.\n\nMore info: https://sass-lang.com/d/bogus-combinators");
}
/**
* Calls the appropriate visit method on $visitor.
*
* @template T
*
* @param SelectorVisitor<T> $visitor
*
* @return T
*
* @internal
*/
abstract public function accept(SelectorVisitor $visitor);
final public function __toString(): string
{
return Serializer::serializeSelector($this, true);
}
}
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