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<?php
require_once('OsikaParser.php');
class OsikaEvaluator {
private $_hand;
public function __construct($hand = NULL) {
if ($hand) {
$this->setHand($hand);
}
}
public function setHand($hand) {
$parser = new OsikaParser($hand);
$this->_hand = $parser->parse();
}
private static $_honorCounts = array();
private function _countHonors($suit, $major = FALSE) {
if (!isset(self::$_honorCounts[$suit])) {
self::$_honorCounts[$suit] = array(NULL, NULL);
}
if (self::$_honorCounts[$suit][$major] === NULL) {
self::$_honorCounts[$suit][$major] = preg_match_all($major ? '/a|k|q/' : '/a|k|q|j/', $suit);
}
return self::$_honorCounts[$suit][$major];
}
private static $_cardHonorTricks = array(
'a' => 1.125,
'k' => 0.8125,
'q' => 0.4375,
'j' => 0.125
);
private function _honorTricks($suit) {
// only 3 highest cards in the suit holding count towards honor tricks
$suit = substr($suit, 0, 3);
$cards = self::$_cardHonorTricks;
// only count Jack if it's the highest card in suit
if (strpos($suit, 'j') !== 0) {
$cards = array_slice($cards, 0, 3);
}
$ret = 0;
foreach ($cards as $card => $value) {
$ret += substr_count($suit, $card) * $value;
}
return $ret;
}
private function _honorTrickCorrections($suit) {
// only 3 highest cards in the suit holding count towards honor tricks
$suit = substr($suit, 0, 3);
$count = $this->_countHonors($suit);
// HH = 1/4 trick; HHH = 1/2 trick
return ($count < 2) ? 0 : $count * 0.25;
}
private function _honorTrickSupportCorrections($suit) {
$ret = 0;
// every 10 within 4+ suit with any of the AKQ = 1/8 of a trick
if (strlen($suit) > 3 && strpos($suit, 't') !== FALSE && $this->_countHonors($suit, TRUE)) {
$ret += 0.125;
}
// every 109 = 1/16 of a trick
if (strpos($suit, 't9') !== FALSE) {
$ret += 0.0625;
}
return $ret;
}
private function _honorTrickShortCorrections($suit) {
$length = strlen($suit);
// either nothing to subtract from or no need to
if (!$length || $length > 2) {
return 0;
}
$count = $this->_countHonors($suit);
// H sec = -1/8 of a trick; Hx = -1/16 of a trick; HH sec = -1/8 of a trick
return $count * (($length === 1) ? -0.125 : -0.0625);
}
private static $_lengthDistributionTricks = array(
4 => 0.4375,
5 => 1.5,
6 => 2.75,
7 => 3.9375
);
private function _distributionTricks($suit) {
$length = strlen($suit);
if ($length < 4) {
return 0;
}
if ($length >= 8) {
return $length - 3;
}
return self::$_lengthDistributionTricks[$length];
}
private function _quickTricks($hand) {
$hand = '|'.implode('|', $hand);
// aces and kings contribute towards quick tricks
$highCards = substr_count($hand, 'a') + substr_count($hand, 'k');
// queens and jacks contribute against, but we don't count unsupported jacks, because of how they count towards honor tricks in the first place
$lowCards = substr_count($hand, 'q') + substr_count($hand, 'j') - substr_count($hand, '|j');
$difference = $highCards - $lowCards;
// difference of:
// +3 or more = 1/8
// +2 = 1/16
// +1 to -1 = 0
// -2 = -1/16
// -3 or less = -1/8
if (abs($difference) <= 1) {
return 0;
}
if ($difference > 2) {
return 0.125;
}
if ($difference > 1) {
return 0.0625;
}
if ($difference < -2) {
return -0.125;
}
if ($difference < -1) {
return -0.0625;
}
}
private function _middleCardCorrections($hand) {
// count only 10's and 9's in 3+ card suits
$nonshort = '';
foreach ($hand as $suit) {
if (strlen($suit) >= 3) {
$nonshort .= $suit;
}
}
// statistically, we should have 2 of those
// but we're not counting short suits and some long suit 10 configurations
// so the par for the course is 1 middle card
$count = preg_match_all('/t|9/', $nonshort) - 1;
// if we're better than that single middle card -> 1/16 of a trick
// if we're worse -> -1/16
return max(-0.0625, min(0.0625, $count * 0.0625));
}
private function _shortSuitCorrections($distribution) {
$shortSuits = array();
foreach ($distribution as $suit) {
// short suit is a 3- card suit here
if ($suit <= 3) {
$shortSuits[] = $suit;
}
}
// the correction only applies if we're having 2 or more short suits
if (count($shortSuits) < 2) {
return 0;
}
sort($shortSuits);
// if the shortest short suits are 3-0, 3-1 or 2-0, we add 1/16 of a trick
$diff = $shortSuits[1] - $shortSuits[0];
return ($diff > 1) ? 0.0625 : 0;
}
private function _majorSuitCorrections($distribution) {
// at least 8 cards in majors...
if ($distribution['s'] + $distribution['h'] >= 8) {
// ...and at least 3 cards in each major...
if ($distribution['h'] > 2 && $distribution['h'] > 2) {
// ...constitute a 1/16 of a trick correction
return 0.0625;
}
}
return 0;
}
// I honestly have no idea what the hell's going on below.
private function _localizationCorrections($result, $distribution) {
$strength = array();
$length = array();
foreach ($result['lh'] as $index => $value) {
if (strlen($index) === 1) {
if ($distribution[$index] >= 3) {
if (isset($strength[$distribution[$index]])) {
$strength[$distribution[$index]] += ($result['lh'][$index]+$result['lh_plus'][$index]+$result['lh_10'][$index]+$result['lh_short'][$index]);
}
else {
$strength[$distribution[$index]] = ($result['lh'][$index]+$result['lh_plus'][$index]+$result['lh_10'][$index]+$result['lh_short'][$index]);
}
if (isset($length[$distribution[$index]])) {
$length[$distribution[$index]] += $distribution[$index];
}
else {
$length[$distribution[$index]] = $distribution[$index];
}
}
}
}
ksort($strength);
ksort($length);
$sumLength = array_sum($length);
$sumStrength = array_sum($strength);
$longestDiff = end($strength)-$sumStrength*end($length)/$sumLength;
$shortestDiff = reset($strength)-$sumStrength*reset($length)/$sumLength;
if (abs($longestDiff) > 0.5) {
if (abs($longestDiff) > 1) {
return 0.25*(abs($longestDiff)/$longestDiff);
}
else {
return 0.125*(abs($longestDiff)/$longestDiff);
}
}
if (abs($shortestDiff) > 0.5) {
if (abs($shortestDiff) > 1) {
return -0.125*(abs($shortestDiff)/$shortestDiff);
}
else {
return -0.0625*(abs($shortestDiff)/$shortestDiff);
}
}
return 0;
}
private static $_suits = ['s','h','d','c'];
public function evaluate() {
$result = array();
$result['lh'] = array();
$result['lh_plus'] = array();
$result['lh_10'] = array();
$result['lh_short'] = array();
$result['lu'] = array();
foreach ($this->_hand as $ind => $suit) {
$suitChar = self::$_suits[$ind];
$result['lh'][$suitChar] = $this->_honorTricks($suit);
$result['lh_plus'][$suitChar] = $this->_honorTrickCorrections($suit);
$result['lh_10'][$suitChar] = $this->_honorTrickSupportCorrections($suit);
$result['lh_short'][$suitChar] = $this->_honorTrickShortCorrections($suit);
$result['lu'][$suitChar] = $this->_distributionTricks($suit);
}
$result['lh']['total'] = array_sum($result['lh']);
$result['lh_plus']['total'] = array_sum($result['lh_plus']);
$result['lh_10']['total'] = array_sum($result['lh_10']);
$result['lh_short']['total'] = array_sum($result['lh_short']);
$result['lu']['total'] = array_sum($result['lu']);
$result['lsz'] = array('total' => $this->_quickTricks($this->_hand));
$result['lu_plus'] = array('total' => $this->_middleCardCorrections($this->_hand));
$distribution = array_combine(self::$_suits, array_map('strlen', $this->_hand));
$result['short_suit'] = array('total' => $this->_shortSuitCorrections($distribution));
$result['major_suit'] = array('total' => $this->_majorSuitCorrections($distribution));
$result['l10n'] = array('total' => $this->_localizationCorrections($result, $distribution));
$subtotal = array();
$lhSubtotal = array();
$total = 0;
foreach ($result as $category => $factor) {
if (count($factor) === 5) {
foreach ($factor as $index => $subt) {
if (!isset($subtotal[$index])) {
$subtotal[$index] = 0;
$lhSubtotal[$index] = 0;
}
$subtotal[$index] += $subt;
if ($category !== 'lu') {
$lhSubtotal[$index] += $subt;
}
}
}
$total += $factor['total'];
}
$result['lh_subtotal'] = $lhSubtotal;
$result['subtotal'] = $subtotal;
$result['total'] = array('total' => $total);
return $result;
}
}
?>
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