MathWikibaseInfo.php
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	<?php

	namespace MediaWiki\Extension\Math;

	use DataValues\StringValue;
	use MediaWiki\Html\Html;
	use MediaWiki\MediaWikiServices;
	use Wikibase\DataModel\Entity\EntityId;
	use Wikibase\Lib\Formatters\SnakFormatter;

	/**
	* This class stores information about mathematical Wikibase items.
	*/
	class MathWikibaseInfo {
	/**
	* @var EntityId
	*/
	private $id;

	/**
	* @var string\|null the label of the item
	*/
	private $label;

	/**
	* @var string\|null description of the item
	*/
	private $description;

	/**
	* @var StringValue\|null a symbol representing the item
	*/
	private $symbol;

	/**
	* @var MathWikibaseInfo[]
	*/
	private $hasParts = [];

	/**
	* @var MathFormatter
	*/
	private $mathFormatter;

	/**
	* @var string\|null
	*/
	private $url;

	/**
	* @param EntityId $entityId
	* @param MathFormatter\|null $mathFormatter to format math equations. Default format is HTML.
	*/
	public function __construct( EntityId $entityId, ?MathFormatter $mathFormatter = null ) {
	$this->id = $entityId;
	$this->mathFormatter = $mathFormatter ?: new MathFormatter( SnakFormatter::FORMAT_HTML );
	}

	/**
	* @param string $label
	*/
	public function setLabel( $label ) {
	$this->label = $label;
	}

	/**
	* @param string $description
	*/
	public function setDescription( $description ) {
	$this->description = $description;
	}

	/**
	* @param StringValue $symbol
	*/
	public function setSymbol( $symbol ) {
	$this->symbol = $symbol;
	}

	/**
	* @param MathWikibaseInfo $info
	*/
	public function addHasPartElement( MathWikibaseInfo $info ) {
	$this->hasParts[] = $info;
	}

	/**
	* @param string $link
	*/
	public function setUrl( $link ) {
	$this->url = $link;
	}

	/**
	* @param MathWikibaseInfo[] $infos
	*/
	public function addHasPartElements( $infos ) {
	array_push( $this->hasParts, ...$infos );
	}

	/**
	* @return EntityId id
	*/
	public function getId() {
	return $this->id;
	}

	/**
	* @return string\|null label
	*/
	public function getLabel() {
	return $this->label;
	}

	/**
	* @return string\|null description
	*/
	public function getDescription() {
	return $this->description;
	}

	/**
	* @return StringValue\|null symbol
	*/
	public function getSymbol() {
	return $this->symbol;
	}

	/**
	* @return string\|null html formatted version of the symbol
	*/
	public function getFormattedSymbol() {
	if ( $this->symbol ) {
	return $this->mathFormatter->format( $this->getSymbol() );
	} else {
	return null;
	}
	}

	/**
	* @return MathWikibaseInfo[] hasparts
	*/
	public function getParts() {
	return $this->hasParts;
	}

	/**
	* @return string\|null
	*/
	public function getUrl() {
	return $this->url;
	}

	/**
	* @return MathFormatter
	*/
	public function getFormatter() {
	return $this->mathFormatter;
	}

	/**
	* Does this info object has elements?
	* @return bool true if there are elements otherwise false
	*/
	public function hasParts() {
	return $this->hasParts !== [];
	}

	/**
	* Generates an HTML table representation of the has-parts elements
	* @return string
	*/
	public function generateTableOfParts() {
	$lang = MediaWikiServices::getInstance()->getContentLanguage();
	$labelAlign = $lang->isRTL() ? 'left' : 'right';
	$labelAlignOpposite = !$lang->isRTL() ? 'left' : 'right';

	$output = '';

	foreach ( $this->hasParts as $part ) {
	$output .= Html::openElement( "tr" );

	$output .= Html::openElement(
	"td",
	[ "style" => "font-weight: bold; text-align:$labelAlign;" ]
	);

	if ( $part->url ) {
	$output .= Html::element(
	"a",
	[ "href" => $part->url ],
	$part->getLabel()
	);
	} else {
	$output .= htmlspecialchars( $part->getLabel() );
	}

	$output .= Html::closeElement( "td" );
	$output .= Html::openElement(
	"td",
	[ "style" => "text-align:center; padding: 2px; padding-left: 10px; padding-right: 10px;" ]
	);

	if ( $part->url ) {
	$output .= Html::rawElement(
	"a",
	[ "href" => $part->url ],
	$part->getFormattedSymbol()
	);
	} else {
	$output .= $part->getFormattedSymbol();
	}

	$output .= Html::closeElement( "td" );
	$output .= Html::element(
	"td",
	[ "style" => "font-style: italic; text-align:$labelAlignOpposite;" ],
	$part->getDescription()
	);
	$output .= Html::closeElement( "tr" );
	}

	return Html::rawElement( 'table', [ 'style' => 'padding: 5px' ],
	Html::rawElement( 'tbody', [], $output )
	);
	}

	/**
	* Generates a minimalized Html representation of the has-parts elements.
	* @return string
	*/
	public function generateSmallTableOfParts() {
	$output = '';

	foreach ( $this->hasParts as $part ) {
	$output .= Html::rawElement( 'tr', [],
	Html::rawElement( 'td',
	[ 'style' => 'text-align: center; padding-right: 5px;' ],
	$part->getFormattedSymbol()
	) .
	Html::element( 'td', [ 'style' => 'text-align:left;' ], $part->getLabel() )
	);
	}

	return Html::rawElement( 'table', [],
	Html::rawElement( 'tbody', [], $output )
	);
	}
	}

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