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from dataclasses import dataclass, field
from typing import Callable
from .buffer import Buffer
@dataclass
class Position:
pos: int
@dataclass
class Range:
start: Position
end: Position
@dataclass
class Ranges:
ranges: list[Range]
@dataclass
class MultiRanges:
multi_ranges: dict[Buffer, Ranges]
@dataclass
class Selection:
selection: Position | Range | Ranges | MultiRanges
buffers: set[Buffer] = field(default_factory=set)
def __post_init__(self):
if type(self.selection) is MultiRanges:
self.buffers = set(self.selection.multi_ranges)
else:
assert len(self.buffers) == 1
@classmethod
def empty(cls) -> "Selection":
return cls(selection=Position(0), buffers=set())
def promote(self, to_rank: int) -> "Selection":
if to_rank < 0 or to_rank > 3:
raise ValueError(f"Invalid rank: {to_rank}")
if self.rank > to_rank:
raise ValueError(
f"Cannot coerce selection of rank {self.rank} to rank {to_rank}"
)
if self.rank == to_rank:
return self
match self.selection:
case Position(_):
as_range = Range(
start=Position(self.selection.pos),
end=Position(self.selection.pos + 1),
)
as_ranges = Ranges(ranges=[as_range])
if to_rank == 1:
return Selection(selection=as_range, buffers=self.buffers)
if to_rank == 2:
return Selection(selection=as_ranges, buffers=self.buffers)
if to_rank == 3:
return Selection(
MultiRanges({buffer: as_ranges for buffer in self.buffers})
)
case Range(_, _):
as_ranges = Ranges(ranges=[self.selection])
if to_rank == 2:
return Selection(selection=as_ranges, buffers=self.buffers)
if to_rank == 3:
return Selection(
MultiRanges({buffer: as_ranges for buffer in self.buffers})
)
case Ranges(_):
return Selection(
MultiRanges({buffer: self.selection for buffer in self.buffers})
)
raise RuntimeError("Unexpected promotion issue")
@classmethod
def union(cls, *selections: "Selection") -> "Selection":
if not selections:
return cls.empty()
all_buffers = set.union(*[s.buffers for s in selections])
if len(all_buffers) == 0:
return cls.empty()
if len(all_buffers) > 1:
max_rank = 3
else:
max_rank = max(s.rank for s in selections)
if max_rank < 2:
max_rank = 2
promoted = [s.promote(max_rank) for s in selections]
if max_rank == 2:
all_ranges = []
for sel in promoted:
if not type(sel.selection) is Ranges:
raise ValueError(
f"Selection of rank {sel.rank} is not a range. Should have been promoted to rank 2."
)
all_ranges.extend(sel.selection.ranges)
return cls(selection=Ranges(all_ranges), buffers=all_buffers)
if max_rank == 3:
buffer_ranges: dict[Buffer, list[Range]] = {buf: [] for buf in all_buffers}
for sel in promoted:
if not type(sel.selection) is MultiRanges:
raise ValueError(
f"Selection of rank {sel.rank} is not a multi-range. Should have been promoted to rank 3."
)
for buffer, ranges in sel.selection.multi_ranges.items():
buffer_ranges[buffer].extend(ranges.ranges)
multi = MultiRanges(
{buffer: Ranges(ranges) for buffer, ranges in buffer_ranges.items()}
)
return cls(selection=multi)
raise RuntimeError("Unexpected union issue")
@property
def rank(self) -> int:
match self.selection:
case Position(_):
return 0
case Range(_, _):
return 1
case Ranges(_):
return 2
case MultiRanges(_):
return 3
def broadcast(
self,
rank_zero: Callable[[Position, Buffer], "Selection"],
rank_one: Callable[[Range, Buffer], "Selection"],
) -> "Selection":
match self.selection:
case Position(_):
return rank_zero(self.selection, list(self.buffers)[0])
case Range(_, _) as r:
return rank_one(r, list(self.buffers)[0])
case Ranges(ranges):
buffer = list(self.buffers)[0]
return Selection.union(*[rank_one(r, buffer) for r in ranges])
case MultiRanges(multi):
all_results = []
for buffer, ranges in multi.items():
for r in ranges.ranges:
all_results.append(rank_one(r, buffer))
return Selection.union(*all_results)
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