FloatDef.php

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<?php
 
namespace Wikimedia\ParamValidator\TypeDef;
 
use Wikimedia\ParamValidator\TypeDef;
use Wikimedia\ParamValidator\ValidationException;
 
class FloatDef extends TypeDef {
 
    public function validate( $name, $value, array $settings, array $options ) {
        // Use a regex so as to avoid any potential oddness PHP's default conversion might allow.
        if ( !preg_match( '/^[+-]?(?:\d*\.)?\d+(?:[eE][+-]?\d+)?$/D', $value ) ) {
            throw new ValidationException( $name, $value, $settings, 'badfloat', [] );
        }
 
        $ret = (float)$value;
        if ( !is_finite( $ret ) ) {
            throw new ValidationException( $name, $value, $settings, 'notfinite', [] );
        }
 
        return $ret;
    }
 
    private function fixLocaleWeirdness( $value ) {
        $localeData = localeconv();
        if ( $localeData['decimal_point'] !== '.' ) {
            $value = strtr( $value, [
                $localeData['decimal_point'] => '.',
                // PHP's number formatting currently uses only the first byte from 'decimal_point'.
                // See upstream bug https://bugs.php.net/bug.php?id=78113
                $localeData['decimal_point'][0] => '.',
            ] );
        }
        return $value;
    }
 
    public function stringifyValue( $name, $value, array $settings, array $options ) {
        // Ensure sufficient precision for round-tripping. PHP_FLOAT_DIG was added in PHP 7.2.
        $digits = defined( 'PHP_FLOAT_DIG' ) ? PHP_FLOAT_DIG : 15;
        return $this->fixLocaleWeirdness( sprintf( "%.{$digits}g", $value ) );
    }
 
}