class VariableNameSniff

class VariableNameSniff extends FunctionCall {
    
    /**
     * Returns an array of function names this test wants to listen for.
     *
     * @return array<string>
     */
    public function registerFunctionNames() {
        return [
            'variable_get',
        ];
    }
    
    //end registerFunctionNames()
    
    /**
     * Processes this function call.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile    The file being scanned.
     * @param int                         $stackPtr     The position of the function call in
     *                                                  the stack.
     * @param int                         $openBracket  The position of the opening
     *                                                  parenthesis in the stack.
     * @param int                         $closeBracket The position of the closing
     *                                                  parenthesis in the stack.
     *
     * @return void
     */
    public function processFunctionCall(File $phpcsFile, $stackPtr, $openBracket, $closeBracket) {
        $tokens = $phpcsFile->getTokens();
        // We assume that the sequence '#default_value' => variable_get(...)
        // indicates a variable that the module owns.
        $arrow = $phpcsFile->findPrevious(Tokens::$emptyTokens, $stackPtr - 1, null, true);
        if ($arrow === false || $tokens[$arrow]['code'] !== T_DOUBLE_ARROW) {
            return;
        }
        $arrayKey = $phpcsFile->findPrevious(Tokens::$emptyTokens, $arrow - 1, null, true);
        if ($arrayKey === false || $tokens[$arrayKey]['code'] !== T_CONSTANT_ENCAPSED_STRING || substr($tokens[$arrayKey]['content'], 1, -1) !== '#default_value') {
            return;
        }
        $argument = $this->getArgument(1);
        // Variable name is not a literal string, so we return early.
        if ($argument === false || $tokens[$argument['start']]['code'] !== T_CONSTANT_ENCAPSED_STRING) {
            return;
        }
        $moduleName = Project::getName($phpcsFile);
        if ($moduleName === false) {
            return;
        }
        $variableName = substr($tokens[$argument['start']]['content'], 1, -1);
        if (strpos($variableName, $moduleName) !== 0) {
            $warning = 'All variables defined by your module must be prefixed with your module\'s name to avoid name collisions with others. Expected start with "%s" but found "%s"';
            $data = [
                $moduleName,
                $variableName,
            ];
            $phpcsFile->addWarning($warning, $argument['start'], 'VariableName', $data);
        }
    }
    
    //end processFunctionCall()

}