DefaultTextConstraint.php

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<?php
namespace MediaWiki\EditPage\Constraint;
 
use MediaWiki\Title\Title;
use StatusValue;
 
class DefaultTextConstraint implements IEditConstraint {
 
    private Title $title;
    private bool $allowBlank;
    private string $userProvidedText;
    private string $result;
 
    public function __construct(
        Title $title,
        bool $allowBlank,
        string $userProvidedText
    ) {
        $this->title = $title;
        $this->allowBlank = $allowBlank;
        $this->userProvidedText = $userProvidedText;
    }
 
    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' );
            $statusValue->setResult( false, self::AS_BLANK_ARTICLE );
        }
        return $statusValue;
    }
 
}