class ValidFunctionNameSniff

class ValidFunctionNameSniff extends CamelCapsFunctionNameSniff {
    
    /**
     * A list of function prefixes which may not respect naming convention.
     *
     * @var string[]
     */
    protected $allowedFunctionPrefixes = [
        'template_preprocess',
        'theme',
    ];
    
    /**
     * Processes the tokens within the scope.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The file being processed.
     * @param int                         $stackPtr  The position where this token was
     *                                               found.
     * @param int                         $currScope The position of the current scope.
     *
     * @return void
     */
    protected function processTokenWithinScope(File $phpcsFile, $stackPtr, $currScope) {
        $methodName = $phpcsFile->getDeclarationName($stackPtr);
        if ($methodName === null) {
            // Ignore closures.
            return;
        }
        $className = $phpcsFile->getDeclarationName($currScope);
        $errorData = [
            $className . '::' . $methodName,
        ];
        // Is this a magic method. i.e., is prefixed with "__" ?
        if (preg_match('|^__|', $methodName) !== 0) {
            $magicPart = strtolower(substr($methodName, 2));
            if (isset($this->magicMethods[$magicPart]) === false && isset($this->methodsDoubleUnderscore[$magicPart]) === false) {
                $error = 'Method name "%s" is invalid; only PHP magic methods should be prefixed with a double underscore';
                $phpcsFile->addError($error, $stackPtr, 'MethodDoubleUnderscore', $errorData);
            }
            return;
        }
        $methodProps = $phpcsFile->getMethodProperties($stackPtr);
        if (Common::isCamelCaps($methodName, false, true, $this->strict) === false) {
            if ($methodProps['scope_specified'] === true) {
                $error = '%s method name "%s" is not in lowerCamel format';
                $data = [
                    ucfirst($methodProps['scope']),
                    $errorData[0],
                ];
                $phpcsFile->addError($error, $stackPtr, 'ScopeNotCamelCaps', $data);
            }
            else {
                $error = 'Method name "%s" is not in lowerCamel format';
                $phpcsFile->addError($error, $stackPtr, 'NotCamelCaps', $errorData);
            }
            $phpcsFile->recordMetric($stackPtr, 'CamelCase method name', 'no');
            return;
        }
        else {
            $phpcsFile->recordMetric($stackPtr, 'CamelCase method name', 'yes');
        }
    }
    
    //end processTokenWithinScope()
    
    /**
     * Processes the tokens outside the scope.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The file being processed.
     * @param int                         $stackPtr  The position where this token was
     *                                               found.
     *
     * @return void
     */
    protected function processTokenOutsideScope(File $phpcsFile, $stackPtr) {
        $functionName = $phpcsFile->getDeclarationName($stackPtr);
        if ($functionName === null) {
            // Ignore closures.
            return;
        }
        $isApiFile = substr($phpcsFile->getFilename(), -8) === '.api.php';
        $isHookExample = substr($functionName, 0, 5) === 'hook_';
        if ($isApiFile === true && $isHookExample === true) {
            // Ignore for example hook_ENTITY_TYPE_insert() functions in .api.php
            // files.
            return;
        }
        if ($functionName !== strtolower($functionName)) {
            $expected = strtolower(preg_replace('/([^_])([A-Z])/', '$1_$2', $functionName));
            $error = 'Invalid function name, expected %s but found %s';
            $data = [
                $expected,
                $functionName,
            ];
            $phpcsFile->addError($error, $stackPtr, 'InvalidName', $data);
        }
        // Validate function names only in *.module files.
        $isModuleFile = substr($phpcsFile->getFilename(), -7) === '.module';
        if ($isModuleFile === true) {
            // Check if the function prefix is allowed to not respect standard.
            foreach ($this->allowedFunctionPrefixes as $allowedFunctionPrefix) {
                if (substr($functionName, 0, strlen($allowedFunctionPrefix)) === $allowedFunctionPrefix) {
                    return;
                }
            }
            $moduleName = substr(basename($phpcsFile->getFilename()), 0, -7);
            if (preg_match("/^_?{$moduleName}\\_.+/", $functionName) === 0) {
                $error = 'All functions defined in a module file must be prefixed with the module\'s name, found "%s" but expected "%s"';
                $data = [
                    $functionName,
                    $moduleName . '_' . $functionName,
                ];
                $phpcsFile->addError($error, $stackPtr, 'InvalidPrefix', $data);
            }
        }
    }
    
    //end processTokenOutsideScope()

}