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Passed
Push — master ( b46516...5bdfb8 )
by Matthew
02:09 queued 10s
created

CondHandler::handles()   A

↳ Parent: CondHandler

Complexity

Conditions 1
Paths 1

Size

Total Lines 4
Code Lines 2

Duplication

Lines 0
Ratio 0 %

Code Coverage

Tests 2
CRAP Score 1

Importance

Changes 0
Metric Value
cc 1
eloc 2
nc 1
nop 1
dl 0
loc 4
ccs 2
cts 2
cp 1
crap 1
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 CondHandler implements ExpHandler

            


            
                                                                                                            
                            
            
                                    
            
            

                
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{

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    private $condSymbol;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    private $ifSymbol;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    private $elseSymbol;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    public function __construct()

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        $this->elseSymbol = Symbol::make('else');

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        $this->condSymbol = Symbol::make('cond');

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        $this->ifSymbol = Symbol::make('if');

            


            
                                                                                                            
                            
            
                                    
            
            

                
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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->condSymbol;

            


            
                                                                        
                            
            
                                    
            
            

                
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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->makeIfExp(\array_slice($program, 1)), $env);

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    }

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    private function makeIfExp($conditions)

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        $pred = $conditions[0][0];

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        if ($pred === $this->elseSymbol) {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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            return $conditions[0][1];

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        }

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        return [$this->ifSymbol, $pred,

            


            
                                                                                                            
                            
            
                                    
            
            

                
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            $conditions[0][1], $this->makeIfExp(\array_slice($conditions, 1))];

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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    }

            


            
                                                        
            
                                    
            
            

                
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}