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LetHandler   A
last analyzed

Complexity

Total Complexity 3

Size/Duplication

Total Lines 29
Duplicated Lines 0 %

Coupling/Cohesion

Components 2
Dependencies 1

Test Coverage

Coverage 100%

Importance

Changes 0
Metric Value
dl 0
loc 29
ccs 13
cts 13
cp 1
rs 10
c 0
b 0
f 0
wmc 3
lcom 2
cbo 1

3 Methods

Rating   Name   Duplication   Size   Complexity  
A __construct() 0 5 1
A handles() 0 4 1
A evaluate() 0 10 1
1
<?php
2
3
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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17 4
    public function __construct()
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    {
19 4
        $this->letSymbol = Symbol::make('let');
20 4
        $this->lambdaSymbol = Symbol::make('lambda');
21 4
    }
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23 1
    public function handles($program): bool
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    {
25 1
        return $program[0] === $this->letSymbol;
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    }
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28 1
    public function evaluate($program, Env\EnvInterface $env, Evaluator $evaluate)
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    {
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        // bindings is an array of pairs: [[param, value], [param, value]]
31 1
        list($_let, $bindings) = $program;
0 ignored issues
show
Unused Code introduced by
The assignment to $_let is unused. Consider omitting it like so list($first,,$third).

This checks looks for assignemnts to variables using the list(...) function, where not all assigned variables are subsequently used.

Consider the following code example.

<?php

function returnThreeValues() {
    return array('a', 'b', 'c');
}

list($a, $b, $c) = returnThreeValues();

print $a . " - " . $c;

Only the variables $a and $c are used. There was no need to assign $b.

Instead, the list call could have been.

list($a,, $c) = returnThreeValues();
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32 1
        $letBody = \array_slice($program, 2);
33 1
        $lambdaExp = array_merge(
34 1
            [$this->lambdaSymbol, array_column($bindings, 0)],
35 1
            $letBody); // unpack the body of let into the lambda exp
36 1
        return $evaluate(array_merge([$lambdaExp], array_column($bindings, 1)), $env);
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    }
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}