IdnaEncoder::adapt( int $delta, int $numpoints, bool $firsttime ): int|float

Source

protected static function adapt($delta, $numpoints, $firsttime) {
	// if firsttime then let delta = delta div damp
	if ($firsttime) {
		$delta = floor($delta / self::BOOTSTRAP_DAMP);
	} else {
		// else let delta = delta div 2
		$delta = floor($delta / 2);
	}

	// let delta = delta + (delta div numpoints)
	$delta += floor($delta / $numpoints);
	// let k = 0
	$k = 0;
	// while delta > ((base - tmin) * tmax) div 2 do begin
	$max = floor(((self::BOOTSTRAP_BASE - self::BOOTSTRAP_TMIN) * self::BOOTSTRAP_TMAX) / 2);
	while ($delta > $max) {
		// let delta = delta div (base - tmin)
		$delta = floor($delta / (self::BOOTSTRAP_BASE - self::BOOTSTRAP_TMIN));
		// let k = k + base
		$k += self::BOOTSTRAP_BASE;
	} // end
	// return k + (((base - tmin + 1) * delta) div (delta + skew))
	return $k + floor(((self::BOOTSTRAP_BASE - self::BOOTSTRAP_TMIN + 1) * $delta) / ($delta + self::BOOTSTRAP_SKEW));
}

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