feat: Allow to enforce ellipsis instead of three dots

src/Config.php

@@ -4,12 +4,23 @@
 
 namespace Nextcloud\CodingStandard;
 
+use Nextcloud\CodingStandard\Fixer\NoThreeDotsInStringFixer;
 use PhpCsFixer\Config as Base;
 
 class Config extends Base {
-	public function __construct($name = 'default') {
+
+	/**
+	 * @inheritdoc
+	 * @param bool $enableStringRules Enable rules to improve string quality
+	 */
+	public function __construct($name = 'default',
+		protected bool $enableStringRules = false,
+	) {
 		parent::__construct($name);
 		$this->setIndent("\t");
+		$this->registerCustomFixers([
+			new NoThreeDotsInStringFixer(),
+		]);
 	}
 
 	public function getRules() : array {
@@ -72,6 +83,7 @@ public function getRules() : array {
 				'elements' => ['property', 'method', 'const']
 			],
 			'yoda_style' => ['equal' => false, 'identical' => false, 'less_and_greater' => false],
+			'Nextcloud/no_three_dots_in_string' => $this->enableStringRules,
 		];
 	}
 }

src/Fixer/NoThreeDotsInStringFixer.php

@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nextcloud\CodingStandard\Fixer;
+
+use PhpCsFixer\Fixer\FixerInterface;
+use PhpCsFixer\FixerDefinition\CodeSample;
+use PhpCsFixer\FixerDefinition\FixerDefinition;
+use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
+use PhpCsFixer\Tokenizer\Token;
+use PhpCsFixer\Tokenizer\Tokens;
+
+final class NoThreeDotsInStringFixer implements FixerInterface {
+
+	public function isCandidate(Tokens $tokens): bool {
+		return $tokens->isAnyTokenKindsFound([T_CONSTANT_ENCAPSED_STRING, T_ENCAPSED_AND_WHITESPACE]);
+	}
+
+	public function isRisky(): bool {
+		return true;
+	}
+
+	public function getName(): string {
+		return 'Nextcloud/no_three_dots_in_string';
+	}
+
+	public function getPriority(): int {
+		return 0;
+	}
+
+	public function supports(\SplFileInfo $file): bool {
+		return true;
+	}
+
+	public function getDefinition(): FixerDefinitionInterface {
+		return new FixerDefinition(
+			'There must be no three dots in strings, instead ellipsis shall be used.',
+			[
+				new CodeSample(
+					"<?php \$a = 'Loading ...';\n"
+				),
+			],
+			null,
+			'Changing the characters in strings might affect string comparisons and outputs.'
+		);
+	}
+
+	public function fix(\SplFileInfo $file, Tokens $tokens): void {
+		for ($index = $tokens->count() - 1; $index >= 0; --$index) {
+			/** @var Token $token */
+			$token = $tokens[$index];
+
+			if (!$token->isGivenKind([T_CONSTANT_ENCAPSED_STRING, T_ENCAPSED_AND_WHITESPACE])) {
+				continue;
+			}
+
+			$content = str_replace('...', '…', $token->getContent());
+			if ($token->getContent() === $content) {
+				continue;
+			}
+
+			$tokens[$index] = new Token([$tokens[$index]->getId(), $content]);
+		}
+	}
+}