214 lines
7.3 KiB
Python
214 lines
7.3 KiB
Python
import re
|
|
import copy
|
|
from typing import Any, Dict, List, Optional, Tuple
|
|
|
|
|
|
class ParseError(Exception):
|
|
pass
|
|
|
|
|
|
class Move:
|
|
GTP_COORD = "ABCDEFGHJKLMNOPQRSTUVWYXYZ"
|
|
PLAYERS = 'BW'
|
|
SGF_COORD = [chr(i) for i in range(97, 123)]
|
|
|
|
@staticmethod
|
|
def from_gtp(gtp_coords, player='B'):
|
|
if "pass" in gtp_coords:
|
|
Move(coords=None, player=player)
|
|
return Move(coords=(Move.GTP_COORD.index(gtp_coords[0]), int(gtp_coords[1:]) - 1), player=player)
|
|
|
|
@staticmethod
|
|
def from_sgf(sgf_coords, board_size, player='B'):
|
|
if sgf_coords == "" or Move.SGF_COORD.index(sgf_coords[0]) == board_size: # some servers use [tt] for pass
|
|
return Move(coords=None, player=player)
|
|
return Move(coords = (Move.SGF_COORD.index(sgf_coords[0]), board_size - Move.SGF_COORD.index(sgf_coords[1]) - 1), player=player)
|
|
|
|
def __init__(self, coords: Optional[Tuple[int,int]]=None, player: str='B'):
|
|
self.player = player
|
|
self.coords = coords
|
|
|
|
# def __repr__(self):
|
|
# return f"{self.player}{self.gtp()}"
|
|
# def __hash__(self):
|
|
# return self.__repr__().__hash__()
|
|
# def __eq__(self, other):
|
|
# return self.coords == other.coords and self.player == other.player
|
|
|
|
def gtp(self):
|
|
if self.is_pass:
|
|
return "pass"
|
|
return Move.GTP_COORD[self.coords[0]] + str(self.coords[1] + 1)
|
|
|
|
def sgf(self, board_size):
|
|
if self.is_pass:
|
|
return ""
|
|
return f"{Move.SGF_COORD[self.coords[0]]}{Move.SGF_COORD[board_size - self.coords[1] - 1]}"
|
|
|
|
@property
|
|
def is_pass(self):
|
|
return self.coords is None
|
|
|
|
@property
|
|
def opponent(self):
|
|
return 'W' if self.player=='B' else 'B'
|
|
|
|
|
|
class SGFNode:
|
|
CAST_FIELDS = {"KM": float, "SZ": int, "HA": int} # cast property to this type
|
|
LIST_FIELDS = ["AB", "AW", "TW", "TB", "MA", "SQ", "CR", "TR", "LN","AR","LB"] # cast these properties to lists
|
|
# TODO: all are potential lists?
|
|
|
|
def __init__(self, parent=None, properties=None, move=None):
|
|
self.children = []
|
|
self.properties = copy.copy(properties) if properties is not None else {}
|
|
self.parent = parent
|
|
if self.parent:
|
|
self.parent.children.append(self)
|
|
if parent and move:
|
|
properties[move.player] = move.sgf() # NB needs root['SZ']
|
|
|
|
@property
|
|
def sgf_properties(self) -> Dict:
|
|
"""For hooking into in a subclass and overriding/formatting any additional properties to be output"""
|
|
return self.properties
|
|
|
|
def sgf(self) -> str:
|
|
sgf_str = "".join([f"{k}[{']['.join(v) if isinstance(v,list) else v}]" for k, v in self.sgf_properties.items()])
|
|
if self.children:
|
|
children = [c.sgf() for c in self.children]
|
|
if len(children) == 1:
|
|
sgf_str += ";" + children[0]
|
|
else:
|
|
sgf_str += "(;" + ")(;".join(children) + ")"
|
|
return f"(;{sgf_str})" if self.is_root else sgf_str
|
|
|
|
def __setitem__(self, prop: str, value: Any):
|
|
if prop in self.LIST_FIELDS and isinstance(value, str): # lists (placements, IGS marked dead stones)
|
|
self.properties[prop] = self.properties.get(prop,[]) + re.split(r"\]\s*\[", value)
|
|
elif prop in self.CAST_FIELDS:
|
|
self.properties[prop] = self.CAST_FIELDS[prop](value)
|
|
else:
|
|
self.properties[prop] = value
|
|
|
|
def __getitem__(self, property) -> Any:
|
|
return self.properties.get(property)
|
|
|
|
def get(self, property, default) -> Any:
|
|
return self.properties.get(property, default)
|
|
|
|
@property
|
|
def parent(self) -> Optional["SGFNode"]:
|
|
return self._parent
|
|
|
|
@parent.setter
|
|
def parent(self, parent_node):
|
|
self._parent = parent_node
|
|
self._root = None
|
|
|
|
@property
|
|
def root(self) -> "SGFNode": # cached root property
|
|
if self._root is None:
|
|
self._root = self.parent.root if self.parent else self
|
|
return self._root
|
|
|
|
@property
|
|
def board_size(self) -> int:
|
|
return self.root['SZ',19]
|
|
|
|
@property
|
|
def move(self) -> Optional[Move]:
|
|
for pl in Move.PLAYERS:
|
|
if self[pl]:
|
|
return Move.from_sgf(self[pl], player=pl, board_size=self.board_size)
|
|
|
|
@property
|
|
def placements(self) -> List[Move]:
|
|
return [Move.from_sgf(self[pl], player=pl, board_size=self.board_size) for pl in Move.PLAYERS for sgf in self.get('A'+pl,[]) ]
|
|
|
|
@property
|
|
def move_with_placements(self) -> List[Move]:
|
|
return self.placements + (self.move or [])
|
|
|
|
@property
|
|
def is_root(self):
|
|
return self.parent is None
|
|
|
|
@property
|
|
def empty(self) -> bool:
|
|
return not self.children and not self.properties
|
|
|
|
@property
|
|
def nodes_in_tree(self):
|
|
return [self] + sum([c.nodes_in_tree for c in self.children],[])
|
|
|
|
@property
|
|
def nodes_from_root(self):
|
|
return [self] if self.is_root else self.parent.nodes_from_root + [self]
|
|
|
|
def play(self, move) -> "SGFNode":
|
|
"""Either find an existing child or create a new one with the given move."""
|
|
for c in self.children:
|
|
if c.move == move:
|
|
return c.move
|
|
return SGFNode(parent=self, move=move)
|
|
|
|
@property
|
|
def next_player(self):
|
|
m = self.move
|
|
if m and m.player=='B' or 'AB' in self.properties:
|
|
return 'W'
|
|
return 'B'
|
|
|
|
|
|
class SGF:
|
|
_MOVE_CLASS = SGFNode
|
|
|
|
@staticmethod
|
|
def parse(input_str) -> SGFNode:
|
|
return SGF(input_str).root
|
|
|
|
@staticmethod
|
|
def parse_file(filename, encoding=None) -> SGFNode:
|
|
with open(filename, "rb") as f:
|
|
bin_contents = f.read()
|
|
if not encoding:
|
|
match = re.search(rb"CA\[(.*?)\]", bin_contents)
|
|
if match:
|
|
encoding = match[1].decode("ascii")
|
|
else:
|
|
encoding = "utf-8" # default
|
|
decoded = bin_contents.decode(encoding=encoding)
|
|
return SGF.parse(decoded)
|
|
|
|
def __init__(self, contents):
|
|
self.contents = contents
|
|
try:
|
|
self.ix = self.contents.index("(") + 1
|
|
except ValueError:
|
|
raise ParseError("Parse error: Expected '('")
|
|
self.root = SGFNode()
|
|
self._parse_branch(self.root)
|
|
|
|
def _parse_branch(self,current_move: SGFNode):
|
|
while self.ix < len(self.contents): # https://xkcd.com/1171/
|
|
match = re.match(r"\s*(?:\(|\)|;|(?:(\w+)((?:\[.*?(?<!\\)\]\s*)+)))", self.contents[self.ix :], re.DOTALL)
|
|
if not match:
|
|
break
|
|
self.ix += len(match[0])
|
|
if match[0] == ")":
|
|
return
|
|
if match[0] == "(":
|
|
self._parse_branch(SGFNode(parent=current_move))
|
|
elif match[0] == ";":
|
|
if not current_move.empty: # ignore ; that generate empty nodes
|
|
current_move = self._MOVE_CLASS(parent=current_move)
|
|
else:
|
|
prop, value = match[1], match[2].strip()[1:-1]
|
|
current_move[prop] = value
|
|
if self.ix < len(self.contents):
|
|
raise ParseError(
|
|
f"Parse Error: unexpected character at {self.contents[self.ix - 25:self.ix]}>{self.contents[self.ix]}<{self.contents[self.ix + 1:self.ix + 25]}"
|
|
)
|
|
raise ParseError("Parse Error: expected ')' at end of input.")
|