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Passed
Push — master ( d9bb99...49fd78 )
by Matthew
01:35
created

LambdaExpHandler::evaluate()   A

↳ Parent: LambdaExpHandler

Complexity

Conditions 1
Paths 1

Size

Total Lines 5
Code Lines 3

Duplication

Lines 0
Ratio 0 %

Importance

Changes 0
Metric Value
cc 1
eloc 3
nc 1
nop 3
dl 0
loc 5
rs 9.4285
c 0
b 0
f 0
1 
<?php
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namespace Sphpeme\ExpHandler;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use Sphpeme\Env;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use function Sphpeme\env_extend;

            


                            

                    
                        
                    
                    
                    
                    
                                                                                                    
                        

                            
                            
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The function Sphpeme\env_extend was not found. Maybe you did not declare it correctly or list all dependencies?
                                                                                                

                    
                                                    

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use Sphpeme\Evaluator;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use Sphpeme\Symbol;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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class LambdaExpHandler implements ExpHandler

            


            
                                                                                                            
                            
            
                                    
            
            

                
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{

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    private $lambdaSymbol;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    public function __construct()

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        $this->lambdaSymbol = Symbol::make('lambda');

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    }

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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    public function evaluate($exp, Env $env, Evaluator $evaluate)

            


            
                                                                        
                            
            
                                    
            
            

                
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    {

            


            
                                                                        
                            
            
                                    
            
            

                
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        [$lambda, $params, $body] = $exp;

            


            
                                                                        
                            
            
                                    
            
            

                
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        return function (...$args) use ($env, $body, $params, $evaluate) {

            


            
                                                                        
                            
            
                                    
            
            

                
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            return $evaluate($body, env_extend($env, array_combine($params, $args)));

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        };

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    }

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    public function handles($exp): bool

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        return $exp[0] === $this->lambdaSymbol;

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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    }

            


            
                                                        
            
                                    
            
            

                
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}