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Passed
Pull Request — master (#7)
by Matthew
02:18
created

LetStarHandler::__construct()   A

↳ Parent: LetStarHandler

Complexity

Conditions 1
Paths 1

Size

Total Lines 4
Code Lines 2

Duplication

Lines 0
Ratio 0 %

Importance

Changes 0
Metric Value
cc 1
eloc 2
nc 1
nop 0
dl 0
loc 4
rs 10
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 LetStarHandler implements ExpHandler

            


            
                                                                                                            
                            
            
                                    
            
            

                
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{

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    private $letStarSymbol;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    private $letSymbol;

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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    public function __construct()

            


            
                                                                        
                            
            
                                    
            
            

                
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    {

            


            
                                                                        
                            
            
                                    
            
            

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

            


            
                                                                        
                            
            
                                    
            
            

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

            


            
                                                                                                            
                            
            
                                    
            
            

                
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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->letStarSymbol;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    }

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    public function generateLet($program)

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    {

            


            
                                                                                                            
                            
            
                                    
            
            

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

            


            
                                                                                                            
                            
            
                                    
            
            

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

            


            
                                                                                                            
                            
            
                                    
            
            

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

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        if (\count($bindings) > 1) {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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            return [$this->letSymbol, [$bindings[0]],

            


            
                                                                                                            
                            
            
                                    
            
            

                
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                $this->generateLet(array_merge(

            


            
                                                                                                            
                            
            
                                    
            
            

                
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                    [$this->letStarSymbol, \array_slice($bindings, 1)],

            


            
                                                                                                            
                            
            
                                    
            
            

                
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                        $body))];

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        }

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        return array_merge(

            


            
                                                                                                            
                            
            
                                    
            
            

                
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            [$this->letSymbol, [$bindings[0]]],

            


            
                                                                                                            
                            
            
                                    
            
            

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

            


            
                                                                                                            
                            
            
                                    
            
            

                
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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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        return $evaluate($this->generateLet($program), $env);

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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    }

            


            
                                                        
            
                                    
            
            

                
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}