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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\Visitor;
use ScssPhp\ScssPhp\Ast\Sass\Statement;
use ScssPhp\ScssPhp\Ast\Sass\Statement\AtRootRule;
use ScssPhp\ScssPhp\Ast\Sass\Statement\AtRule;
use ScssPhp\ScssPhp\Ast\Sass\Statement\CallableDeclaration;
use ScssPhp\ScssPhp\Ast\Sass\Statement\ContentBlock;
use ScssPhp\ScssPhp\Ast\Sass\Statement\ContentRule;
use ScssPhp\ScssPhp\Ast\Sass\Statement\DebugRule;
use ScssPhp\ScssPhp\Ast\Sass\Statement\Declaration;
use ScssPhp\ScssPhp\Ast\Sass\Statement\EachRule;
use ScssPhp\ScssPhp\Ast\Sass\Statement\ErrorRule;
use ScssPhp\ScssPhp\Ast\Sass\Statement\ExtendRule;
use ScssPhp\ScssPhp\Ast\Sass\Statement\ForRule;
use ScssPhp\ScssPhp\Ast\Sass\Statement\FunctionRule;
use ScssPhp\ScssPhp\Ast\Sass\Statement\IfClause;
use ScssPhp\ScssPhp\Ast\Sass\Statement\IfRule;
use ScssPhp\ScssPhp\Ast\Sass\Statement\ImportRule;
use ScssPhp\ScssPhp\Ast\Sass\Statement\IncludeRule;
use ScssPhp\ScssPhp\Ast\Sass\Statement\LoudComment;
use ScssPhp\ScssPhp\Ast\Sass\Statement\MediaRule;
use ScssPhp\ScssPhp\Ast\Sass\Statement\MixinRule;
use ScssPhp\ScssPhp\Ast\Sass\Statement\ParentStatement;
use ScssPhp\ScssPhp\Ast\Sass\Statement\ReturnRule;
use ScssPhp\ScssPhp\Ast\Sass\Statement\SilentComment;
use ScssPhp\ScssPhp\Ast\Sass\Statement\StyleRule;
use ScssPhp\ScssPhp\Ast\Sass\Statement\Stylesheet;
use ScssPhp\ScssPhp\Ast\Sass\Statement\SupportsRule;
use ScssPhp\ScssPhp\Ast\Sass\Statement\VariableDeclaration;
use ScssPhp\ScssPhp\Ast\Sass\Statement\WarnRule;
use ScssPhp\ScssPhp\Ast\Sass\Statement\WhileRule;
/**
* A StatementVisitor whose `visit*` methods default to returning `null`, but
* which returns the first non-`null` value returned by any method.
*
* This can be extended to find the first instance of particular nodes in the
* AST.
*
* @internal
*
* @template T
* @template-implements StatementVisitor<T|null>
*/
abstract class StatementSearchVisitor implements StatementVisitor
{
public function visitAtRootRule(AtRootRule $node)
{
return $this->visitChildren($node->getChildren());
}
public function visitAtRule(AtRule $node)
{
if ($node->getChildren() !== null) {
return $this->visitChildren($node->getChildren());
}
return null;
}
public function visitContentBlock(ContentBlock $node)
{
return $this->visitCallableDeclaration($node);
}
public function visitContentRule(ContentRule $node)
{
return null;
}
public function visitDebugRule(DebugRule $node)
{
return null;
}
public function visitDeclaration(Declaration $node)
{
if ($node->getChildren() !== null) {
return $this->visitChildren($node->getChildren());
}
return null;
}
public function visitEachRule(EachRule $node)
{
return $this->visitChildren($node->getChildren());
}
public function visitErrorRule(ErrorRule $node)
{
return null;
}
public function visitExtendRule(ExtendRule $node)
{
return null;
}
public function visitForRule(ForRule $node)
{
return $this->visitChildren($node->getChildren());
}
public function visitFunctionRule(FunctionRule $node)
{
return $this->visitCallableDeclaration($node);
}
public function visitIfRule(IfRule $node)
{
$value = $this->searchIterable($node->getClauses(), function (IfClause $clause) {
return $this->searchIterable($clause->getChildren(), function (Statement $child) {
return $child->accept($this);
});
});
if ($node->getLastClause() !== null) {
$value = $value ?? $this->searchIterable($node->getLastClause()->getChildren(), function (Statement $child) {
return $child->accept($this);
});
}
return $value;
}
public function visitImportRule(ImportRule $node)
{
return null;
}
public function visitIncludeRule(IncludeRule $node)
{
if ($node->getContent() !== null) {
return $this->visitContentBlock($node->getContent());
}
return null;
}
public function visitLoudComment(LoudComment $node)
{
return null;
}
public function visitMediaRule(MediaRule $node)
{
return $this->visitChildren($node->getChildren());
}
public function visitMixinRule(MixinRule $node)
{
return $this->visitCallableDeclaration($node);
}
public function visitReturnRule(ReturnRule $node)
{
return null;
}
public function visitSilentComment(SilentComment $node)
{
return null;
}
public function visitStyleRule(StyleRule $node)
{
return $this->visitChildren($node->getChildren());
}
public function visitStylesheet(Stylesheet $node)
{
return $this->visitChildren($node->getChildren());
}
public function visitSupportsRule(SupportsRule $node)
{
return $this->visitChildren($node->getChildren());
}
public function visitVariableDeclaration(VariableDeclaration $node)
{
return null;
}
public function visitWarnRule(WarnRule $node)
{
return null;
}
public function visitWhileRule(WhileRule $node)
{
return $this->visitChildren($node->getChildren());
}
/**
* Visits each of $node's expressions and children.
*
* The default implementations of {@see visitFunctionRule} and {@see visitMixinRule}
* call this.
*
* @return T|null
*/
protected function visitCallableDeclaration(CallableDeclaration $node)
{
return $this->visitChildren($node->getChildren());
}
/**
* Visits each child in $children.
*
* The default implementation of the visit methods for all {@see ParentStatement}s
* call this.
*
* @param Statement[] $children
*
* @return T|null
*/
protected function visitChildren(array $children)
{
foreach ($children as $child) {
$result = $child->accept($this);
if ($result !== null) {
return $result;
}
}
return null;
}
/**
* Returns the first `T` returned by $callback for an element of $iterable,
* or `null` if it returns `null` for every element.
*
* @template E
* @param iterable<E> $iterable
* @param callable(E): (T|null) $callback
*
* @return T|null
*/
private function searchIterable(iterable $iterable, callable $callback)
{
foreach ($iterable as $element) {
$value = $callback($element);
if ($value !== null) {
return $value;
}
}
return null;
}
}
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