48. class Cell: One location for a character
Each instance of this class represents one location in the
puzzle where a letter may go. Each cell's .text attribute may contain one clue letter, or
UNK_CELL if there is no clue letter there.
Clues are uppercased for the convenience of the person
preparing the puzzle file. Here is the interface:
kkck
# - - - - - c l a s s C e l l
class Cell(object):
'''Represents one character position of the puzzle.
Exports:
Cell ( coord, text ):
[ (coord is a cell location as a Coord instance) and
(text is a clue character, or UNK_CELL if the content
of this cell is not initially known) ->
return a new Cell instance with that location and
text, and no associated slots ]
.coord: [ as passed to constructor, read-only ]
.text: [ as passed to constructor, read-only, uppercased ]
.addSlot ( slot ):
[ slot is a Slot instance that intersects self ->
self := self with slot added to its list of
associated slots ]
.genSlots():
[ generate the slots associated with self as a sequence
of Slot instances, if any ]
State/Invariants:
.__slotList:
[ a list of the Slot instances that intersect self,
if any ]
'''
