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Passed
Push — master ( be8573...dc3494 )
by Matthew
01:36
created

LetHandler::evaluate()   A

↳ Parent: LetHandler

Complexity

Conditions 1
Paths 1

Size

Total Lines 9
Code Lines 6

Duplication

Lines 0
Ratio 0 %

Importance

Changes 0
Metric Value
cc 1
eloc 6
nc 1
nop 3
dl 0
loc 9
rs 9.6666
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 Sphpeme\Evaluator;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use Sphpeme\Symbol;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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class LetHandler implements ExpHandler

            


            
                                                                                                            
                            
            
                                    
            
            

                
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{

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    private $letSymbol;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    private $lambdaSymbol;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    public function __construct()

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        $this->letSymbol = Symbol::make('let');

            


            
                                                                                                            
                            
            
                                    
            
            

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

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    }

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    public function handles($program): bool

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        return $program[0] === $this->letSymbol;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    }

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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    public function evaluate($program, Env\EnvInterface $env, Evaluator $evaluate)

            


            
                                                        
            
                                    
            
            

                
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    {

            


            
                                                        
            
                                    
            
            

                
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        // bindings is an array of pairs: [[param, value], [param, value]]

            


            
                                                        
            
                                    
            
            

                
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        list($_let, $bindings) = $program;

            


            
                                                        
            
                                    
            
            

                
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        $letBody = \array_slice($program, 2);

            


            
                                                        
            
                                    
            
            

                
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        $lambdaExp = array_merge(

            


            
                                                        
            
                                    
            
            

                
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            [$this->lambdaSymbol, array_column($bindings, 0)],

            


            
                                                        
            
                                    
            
            

                
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            $letBody); // unpack the body of let into the lambda exp

            


            
                                                        
            
                                    
            
            

                
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        return $evaluate(array_merge([$lambdaExp], array_column($bindings, 1)), $env);

            


            
                                                        
            
                                    
            
            

                
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    }

            


            
                                                        
            
                                    
            
            

                
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}