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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Facade\Ignition\Solutions;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Illuminate\Support\Facades\Blade;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Facade\IgnitionContracts\RunnableSolution;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class MakeViewVariableOptionalSolution implements RunnableSolution  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $variableName;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $viewFile;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct($variableName = null, $viewFile = null)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->variableName = $variableName;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->viewFile = $viewFile;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getSolutionTitle(): string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return '$'.$this->variableName.' is undefined';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getDocumentationLinks(): array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return [];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getSolutionActionDescription(): string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $path = str_replace(base_path().'/', '', $this->viewFile);  | 
            
                            
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                        $output = [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'Make the variable optional in the blade template.',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'Replace `{{ $'.$this->variableName.' }}` with `{{ $'.$this->variableName.' ?? \'\' }}`', | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return implode(PHP_EOL, $output);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getRunButtonText(): string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return 'Make variable optional';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getSolutionDescription(): string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return '';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    public function getRunParameters(): array  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return [  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            'variableName' => $this->variableName,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            'viewFile' => $this->viewFile,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        ];  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function isRunnable(array $parameters = [])  | 
            
                            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->makeOptional($this->getRunParameters()) !== false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function run(array $parameters = [])  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $output = $this->makeOptional($parameters);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($output !== false) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            file_put_contents($parameters['viewFile'], $output);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function makeOptional(array $parameters = [])  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $originalContents = file_get_contents($parameters['viewFile']);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $newContents = str_replace('$'.$parameters['variableName'], '$'.$parameters['variableName']." ?? ''", $originalContents); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // Compile blade, tokenize  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $originalTokens = token_get_all(Blade::compileString($originalContents));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $newTokens = token_get_all(Blade::compileString($newContents));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // Generate what we expect the tokens to be after we change the blade file  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $expectedTokens = [];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($originalTokens as $key => $token) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $expectedTokens[] = $token;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if ($token[0] === T_VARIABLE && $token[1] === '$'.$parameters['variableName']) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $expectedTokens[] = [T_WHITESPACE, ' ', $token[2]];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $expectedTokens[] = [T_COALESCE, '??', $token[2]];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $expectedTokens[] = [T_WHITESPACE, ' ', $token[2]];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $expectedTokens[] = [T_CONSTANT_ENCAPSED_STRING, "''", $token[2]];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($expectedTokens !== $newTokens) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $newContents;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVarassignment in line 1 and the$higherassignment in line 2 are dead. The first because$myVaris never used and the second because$higheris always overwritten for every possible time line.