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NamesGenerator.php
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NamesGenerator.php
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<?php
namespace Eris\Generator;
use Eris\Generator;
use Eris\Generators;
use Eris\Random\RandomRange;
function names()
{
return Generators::names();
}
/**
* @template-implements Generator<string>
*/
class NamesGenerator implements Generator
{
private $list;
/**
* @link http://data.bfontaine.net/names/firstnames.txt
*/
public static function defaultDataSet()
{
return new self(
array_map(
function ($line) {
return trim($line, " \n");
},
file(__DIR__ . "/first_names.txt")
)
);
}
public function __construct(array $list)
{
$this->list = $list;
}
public function __invoke($size, RandomRange $rand)
{
$candidateNames = $this->filterDataSet(
$this->lengthLessThanOrEqualTo($size)
);
if (!$candidateNames) {
return GeneratedValueSingle::fromJustValue('', 'names');
}
$index = $rand->rand(0, count($candidateNames) - 1);
return GeneratedValueSingle::fromJustValue($candidateNames[$index], 'names');
}
public function shrink(GeneratedValue $value)
{
$candidateNames = $this->filterDataSet(
$this->lengthSlightlyLessThan(strlen($value->unbox()))
);
if (!$candidateNames) {
return $value;
}
$distances = $this->distancesBy($value->unbox(), $candidateNames);
return GeneratedValueSingle::fromJustValue($this->minimumDistanceName($distances), 'names');
}
private function filterDataSet(callable $predicate)
{
return array_values(array_filter(
$this->list,
$predicate
));
}
private function lengthLessThanOrEqualTo($size)
{
return function ($name) use ($size) {
return strlen($name) <= $size;
};
}
private function lengthSlightlyLessThan($size)
{
$lowerLength = $size - 1;
return function ($name) use ($lowerLength) {
return strlen($name) === $lowerLength;
};
}
private function distancesBy($value, array $candidateNames)
{
$distances = [];
foreach ($candidateNames as $name) {
$distances[$name] = levenshtein($value, $name);
}
return $distances;
}
private function minimumDistanceName($distances)
{
$minimumDistance = min($distances);
$candidatesWithEqualDistance = array_filter(
$distances,
function ($distance) use ($minimumDistance) {
return $distance == $minimumDistance;
}
);
return array_keys($candidatesWithEqualDistance)[0];
}
}

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text/x-php
Expires
Sat, May 16, 21:14 (1 d, 13 h)
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NamesGenerator.php (2 KB)

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