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<?php
namespace MediaWiki\CommentFormatter;
use ArrayIterator;
use IteratorIterator;
use MediaWiki\CommentStore\CommentStore;
use MediaWiki\Title\TitleValue;
use Traversable;
/**
* An adaptor which converts a row iterator into a CommentItem iterator for
* batch formatting.
*
* Fluent-style mutators are provided to configure how comment text is extracted
* from rows.
*
* Using an iterator for this configuration, instead of putting the
* options in CommentBatch, allows CommentBatch to be a simple single
* class without a CommentStore dependency.
*
* @since 1.38
*/
class RowCommentIterator extends IteratorIterator {
/** @var CommentStore */
private $commentStore;
/** @var string|null */
private $commentKey;
/** @var string|null */
private $namespaceField;
/** @var string|null */
private $titleField;
/** @var string|null */
private $indexField;
/**
* @internal Use RowCommentFormatter::rows()
* @param CommentStore $commentStore
* @param Traversable|array $rows
*/
public function __construct( CommentStore $commentStore, $rows ) {
if ( is_array( $rows ) ) {
parent::__construct( new ArrayIterator( $rows ) );
} else {
parent::__construct( $rows );
}
$this->commentStore = $commentStore;
}
/**
* Set what CommentStore calls the key -- typically a legacy field name
* which once held a comment. This must be called before attempting
* iteration.
*
* @param string $key
* @return $this
*/
public function commentKey( $key ) {
$this->commentKey = $key;
return $this;
}
/**
* Set the namespace field. If this is not called, the item will not have
* a self-link target, although it may be provided by the batch.
*
* @param string $field
* @return $this
*/
public function namespaceField( $field ) {
$this->namespaceField = $field;
return $this;
}
/**
* Set the title field. If this is not called, the item will not have
* a self-link target, although it may be provided by the batch.
*
* @param string $field
* @return $this
*/
public function titleField( $field ) {
$this->titleField = $field;
return $this;
}
/**
* Set the index field. Values from this field will appear as array keys
* in the final formatted comment array. If unset, the array will be
* numerically indexed.
*
* @param string $field
* @return $this
*/
public function indexField( $field ) {
$this->indexField = $field;
return $this;
}
public function key(): string {
if ( $this->indexField ) {
return parent::current()->{$this->indexField};
} else {
return parent::key();
}
}
public function current(): CommentItem {
if ( $this->commentKey === null ) {
throw new \RuntimeException( __METHOD__ . ': commentKey must be specified' );
}
$row = parent::current();
$comment = $this->commentStore->getComment( $this->commentKey, $row );
$item = new CommentItem( (string)$comment->text );
if ( $this->namespaceField && $this->titleField ) {
$item->selfLinkTarget( new TitleValue(
(int)$row->{$this->namespaceField},
(string)$row->{$this->titleField}
) );
}
return $item;
}
}