Cdebase ported to Python

1 files changed, 155 insertions, 0 deletions

diff --git a/bcdd/ParContract.py b/bcdd/ParContract.py
new file mode 100644
index 0000000..918efae
--- /dev/null
+++ b/bcdd/ParContract.py
@@ -0,0 +1,155 @@
+import functools
+
+from .BCalcWrapper import BCalcWrapper as bcw
+from .Exceptions import ParScoreInvalidException
+
+
+class ParContract(object):
+    def __init__(self, level=0, denom='', declarer='', doubled=False, score=0):
+        self.level = level
+        self.denomination = denom
+        self.declarer = declarer
+        self.doubled = doubled
+        self.score = score
+
+    def validate(self):
+        if self.score == 0:
+            return self
+        if (self.level < 1) or (self.level > 7):
+            raise ParScoreInvalidException(
+                'Invalid par contract level: %d' % (self.level))
+        if self.denomination not in 'CDHSN':
+            raise ParScoreInvalidException(
+                'Invalid par contract denomination: ' + self.denomination)
+        if self.declarer not in 'NESW':
+            raise ParScoreInvalidException(
+                'Invalid par contract declarer: ' + self.declarer)
+        return self
+
+    def __repr__(self):
+        if self.score == 0:
+            return 'PASS'
+        return '%d%s%s %s %+d' % (
+            self.level,
+            self.denomination,
+            'x' if self.doubled else '',
+            self.declarer,
+            self.score)
+
+    def __eq__(self, other):
+        return hash(self) == hash(other)
+
+    def __hash__(self):
+        return self.score + self.level + 10000 * (
+            ord(self.denomination[0]) if self.denomination else 0)
+
+    def calculate_score(self, tricks, vulnerable=False):
+        if self.level == 0:
+            return 0
+        score = 0
+        if self.level + 6 > tricks:
+            undertricks = self.level + 6 - tricks
+            if self.doubled:
+                while True:
+                    if undertricks == 1:
+                        # first undertrick: 100 non-vul, 200 vul
+                        score -= 200 if vulnerable else 100
+                    else:
+                        if (undertricks <= 3) and not vulnerable:
+                            # second non-vul undertrick: 200
+                            score -= 200
+                        else:
+                            # further undertricks: 300
+                            score -= 300
+                    undertricks -= 1
+                    if undertricks == 0:
+                        break;
+            else:
+                score = -100 if vulnerable else -50
+                score *= undertricks
+        else:
+            par_tricks = self.level
+            while True:
+                if (self.denomination == 'N') and (par_tricks == 1):
+                    # first non-trump trick: 40
+                    score += 40
+                else:
+                    # other tricks
+                    score += 30 if self.denomination in 'NSH' else 20
+                par_tricks -= 1
+                if par_tricks == 0:
+                    break
+            overtricks = tricks - self.level - 6
+            if self.doubled:
+                score *= 2
+                score += 50
+            # game premium
+            score += (500 if vulnerable else 300) if (score >= 100) else 50
+            if self.doubled:
+                score += overtricks * (200 if vulnerable else 100)
+            else:
+                score += overtricks * (20 if self.denomination in 'CD' else 30)
+            if self.level == 7:
+                # grand slam premium
+                score += 1500 if vulnerable else 1000
+            elif self.level == 6:
+                # small slam premium
+                score += 750 if vulnerable else 500
+        if self.declarer in 'EW':
+            score = -score
+        return score
+
+    def __gt__(self, other):
+        denomination = bcw.DENOMINATIONS.index(self.denomination) \
+                       if self.denomination in bcw.DENOMINATIONS \
+                          else -1
+        other_denomination = bcw.DENOMINATIONS.index(
+            other.denomination) \
+            if other.denomination in bcw.DENOMINATIONS else -1
+        return (self.level > other.level) \
+            or ((self.level == other.level) \
+                and (denomination > other_denomination))
+
+    def get_defense(self, dd_table, vulnerable):
+        declarer_index = bcw.PLAYERS.index(self.declarer) \
+                         if self.declarer in bcw.PLAYERS else -1
+        denomination_index = bcw.DENOMINATIONS.index(self.denomination) \
+                             if self.denomination in bcw.DENOMINATIONS else -1
+        if (self.level != 0) \
+           and (self.level + 6
+                <= dd_table[declarer_index][denomination_index]):
+            defenders_indexes = []
+            defenders_indexes.append((declarer_index + 1) % 4);
+            defenders_indexes.append((declarer_index + 3) % 4);
+            possible_defense = []
+            score_squared = self.score * self.score
+            for i in range(0, 5):
+                level = self.level
+                if i <= denomination_index:
+                    level += 1
+                if level <= 7:
+                    for defender in defenders_indexes:
+                        if level + 6 > dd_table[defender][i]:
+                            defense = ParContract(
+                                level,
+                                bcw.DENOMINATIONS[i],
+                                bcw.PLAYERS[defender],
+                                True,
+                                0)
+                            defense.score = defense.calculate_score(
+                                dd_table[defender][i],
+                                vulnerable)
+                            if score_squared > self.score * defense.score:
+                                possible_defense.append(defense)
+            if possible_defense:
+                possible_defense.sort(
+                    key=lambda x: abs(x.score - self.score))
+                optimum_defense = possible_defense[-1]
+                possible_defense = [defense for defense in possible_defense
+                                    if defense.score == optimum_defense.score]
+                for defense in possible_defense:
+                    # Lowest from the most profitable sacrifices
+                    if optimum_defense > defense:
+                        optimum_defense = defense
+                return optimum_defense
+        return None