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SnakeCaseFormatter.php
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SnakeCaseFormatter.php
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<?php
namespace Kolyunya\StringProcessor\Format;
use Kolyunya\StringProcessor\Format\CaseSwitcher;
use Kolyunya\StringProcessor\ProcessorInterface;
/**
* Converts a string to a "snake_case".
* @author Kolyunya
*/
class SnakeCaseFormatter extends CaseSwitcher implements ProcessorInterface
{
/**
* @inheritdoc
*/
protected $destinationCase = self::SNAKE_CASE;
/**
* @inheritdoc
*/
protected function processCamelCase($string)
{
// Add underscores before each capital letter
// which is not the first letter of the string.
$pattern = '/(?<!^)\p{Lu}/u';
$callback = function ($matches) {
$match = $matches[0];
$replace = "_$match";
return $replace;
};
$string = preg_replace_callback($pattern, $callback, $string);
// Convert the string to the lower case.
$string = mb_convert_case($string, MB_CASE_LOWER);
return $string;
}
/**
* @inheritdoc
*/
protected function processKebabCase($string)
{
// Replaces hyphens with underscores.
$string = str_replace('-', '_', $string);
return $string;
}
/**
* @inheritdoc
*/
protected function processSentenceCase($string)
{
// Replace spaces with underscores.
$string = str_replace(' ', '_', $string);
// Convert the string to the lower case.
$string = mb_convert_case($string, MB_CASE_LOWER);
return $string;
}
/**
* @inheritdoc
*/
protected function processUndefinedCase($string)
{
$string = $this->processCamelCase($string);
$string = $this->processKebabCase($string);
$string = $this->processSentenceCase($string);
$string = $this->removeDuplicateUnderscores($string);
$string = $this->removeTailUnderscores($string);
return $string;
}
/**
* Removes duplicate underscores which will occur while
* parsing strings like "Some-Word-In-Strange-Case".
* @param string $string String to process.
* @return string String with no duplicate underscores.
*/
private function removeDuplicateUnderscores($string)
{
// Keep removing duplicate underscores while they are present.
while (mb_strpos($string, '__') !== false) {
$string = str_replace('__', '_', $string);
}
return $string;
}
/**
* Removes tail underscores.
* @param string $string String to process.
* @return string String with no tail underscores.
*/
private function removeTailUnderscores($string)
{
// Keep removing tail underscores while they are present.
$pattern = '/(^_)|(_$)/u';
while (preg_match($pattern, $string) === 1) {
$string = preg_replace($pattern, '', $string);
}
return $string;
}
}