DefaultTextConstraint.php
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DefaultTextConstraint.php
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	<?php
	/**
	* @license GPL-2.0-or-later
	* @file
	*/

	namespace MediaWiki\EditPage\Constraint;

	use MediaWiki\Title\Title;
	use StatusValue;
	use Wikimedia\Message\MessageValue;

	/**
	* Don't save a new page if it's blank or if it's a MediaWiki:
	* message with content equivalent to default (allow empty pages
	* in this case to disable messages, see T52124)
	*
	* @since 1.36
	* @internal
	* @author DannyS712
	*/
	class DefaultTextConstraint implements IEditConstraint {

	private string $result;

	/**
	* @param Title $title
	* @param bool $allowBlank
	* @param string $userProvidedText
	* @param string $submitButtonLabel
	*/
	public function __construct(
	private readonly Title $title,
	private readonly bool $allowBlank,
	private readonly string $userProvidedText,
	private readonly string $submitButtonLabel,
	) {
	}

	public function checkConstraint(): string {
	$defaultMessageText = $this->title->getDefaultMessageText();
	if ( $this->title->getNamespace() === NS_MEDIAWIKI && $defaultMessageText !== false ) {
	$defaultText = $defaultMessageText;
	} else {
	$defaultText = '';
	}

	if ( !$this->allowBlank && $this->userProvidedText === $defaultText ) {
	$this->result = self::CONSTRAINT_FAILED;
	} else {
	$this->result = self::CONSTRAINT_PASSED;
	}
	return $this->result;
	}

	public function getLegacyStatus(): StatusValue {
	$statusValue = StatusValue::newGood();
	if ( $this->result === self::CONSTRAINT_FAILED ) {
	$statusValue->fatal(
	'blankarticle',
	MessageValue::new( $this->submitButtonLabel ),
	);
	$statusValue->value = self::AS_BLANK_ARTICLE;
	}
	return $statusValue;
	}

	}