class NamespaceDeclarationSniff

class NamespaceDeclarationSniff implements Sniff {
    public const CODE_INVALID_WHITESPACE_AFTER_NAMESPACE = 'InvalidWhitespaceAfterNamespace';
    public const CODE_DISALLOWED_CONTENT_BETWEEN_NAMESPACE_NAME_AND_SEMICOLON = 'DisallowedContentBetweenNamespaceNameAndSemicolon';
    public const CODE_DISALLOWED_BRACKETED_SYNTAX = 'DisallowedBracketedSyntax';
    
    /**
     * @return array<int, (int|string)>
     */
    public function register() : array {
        return [
            T_NAMESPACE,
        ];
    }
    
    /**
     * @phpcsSuppress SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
     * @param int $namespacePointer
     */
    public function process(File $phpcsFile, $namespacePointer) : void {
        $tokens = $phpcsFile->getTokens();
        $pointerAfterNamespace = TokenHelper::findNextEffective($phpcsFile, $namespacePointer + 1);
        if ($tokens[$pointerAfterNamespace]['code'] === T_NS_SEPARATOR) {
            return;
        }
        $this->checkWhitespaceAfterNamespace($phpcsFile, $namespacePointer);
        $this->checkDisallowedContentBetweenNamespaceNameAndSemicolon($phpcsFile, $namespacePointer);
        $this->checkDisallowedBracketedSyntax($phpcsFile, $namespacePointer);
    }
    private function checkWhitespaceAfterNamespace(File $phpcsFile, int $namespacePointer) : void {
        $tokens = $phpcsFile->getTokens();
        $whitespacePointer = $namespacePointer + 1;
        if ($tokens[$whitespacePointer]['code'] !== T_WHITESPACE) {
            $phpcsFile->addError('Expected one space after namespace statement.', $namespacePointer, self::CODE_INVALID_WHITESPACE_AFTER_NAMESPACE);
            return;
        }
        if ($tokens[$whitespacePointer]['content'] === ' ') {
            return;
        }
        $errorMessage = $tokens[$whitespacePointer]['content'][0] === "\t" ? 'Expected one space after namespace statement, found tab.' : sprintf('Expected one space after namespace statement, found %d.', strlen($tokens[$whitespacePointer]['content']));
        $fix = $phpcsFile->addFixableError($errorMessage, $namespacePointer, self::CODE_INVALID_WHITESPACE_AFTER_NAMESPACE);
        if (!$fix) {
            return;
        }
        $phpcsFile->fixer
            ->beginChangeset();
        $phpcsFile->fixer
            ->replaceToken($whitespacePointer, ' ');
        $phpcsFile->fixer
            ->endChangeset();
    }
    private function checkDisallowedContentBetweenNamespaceNameAndSemicolon(File $phpcsFile, int $namespacePointer) : void {
        if (array_key_exists('scope_opener', $phpcsFile->getTokens()[$namespacePointer])) {
            return;
        }
        $namespaceNameStartPointer = TokenHelper::findNextEffective($phpcsFile, $namespacePointer + 1);
        $namespaceNameEndPointer = TokenHelper::findNextExcluding($phpcsFile, TokenHelper::getNameTokenCodes(), $namespaceNameStartPointer + 1) - 1;
        
        /** @var int $namespaceSemicolonPointer */
        $namespaceSemicolonPointer = TokenHelper::findNextLocal($phpcsFile, T_SEMICOLON, $namespaceNameEndPointer + 1);
        if ($namespaceNameEndPointer + 1 === $namespaceSemicolonPointer) {
            return;
        }
        $fix = $phpcsFile->addFixableError('Disallowed content between namespace name and semicolon.', $namespacePointer, self::CODE_DISALLOWED_CONTENT_BETWEEN_NAMESPACE_NAME_AND_SEMICOLON);
        if (!$fix) {
            return;
        }
        $phpcsFile->fixer
            ->beginChangeset();
        FixerHelper::removeBetween($phpcsFile, $namespaceNameEndPointer, $namespaceSemicolonPointer);
        $phpcsFile->fixer
            ->endChangeset();
    }
    private function checkDisallowedBracketedSyntax(File $phpcsFile, int $namespacePointer) : void {
        $tokens = $phpcsFile->getTokens();
        if (!array_key_exists('scope_opener', $tokens[$namespacePointer])) {
            return;
        }
        $fix = $phpcsFile->addFixableError('Bracketed syntax for namespaces is disallowed.', $namespacePointer, self::CODE_DISALLOWED_BRACKETED_SYNTAX);
        if (!$fix) {
            return;
        }
        $phpcsFile->fixer
            ->beginChangeset();
        $phpcsFile->fixer
            ->replaceToken($tokens[$namespacePointer]['scope_opener'], ';');
        $phpcsFile->fixer
            ->replaceToken($tokens[$namespacePointer]['scope_closer'], '');
        $phpcsFile->fixer
            ->endChangeset();
    }

}