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grid.lua
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grid.lua
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local grid = setmetatable({},{__call = function(self,...) return self.new(...) end})
grid.__index= grid
grid.__call = function(self,x,y)
return self.grid[x][y]
end
grid.new = function()
return setmetatable({grid = {}},grid)
end
function grid:clear()
self.grid = {}
end
function grid:get(x,y)
return self.grid[x] and self.grid[x][y]
end
function grid:set(x,y,v)
self.grid[x] = self.grid[x] or {}
self.grid[x][y] = v
end
function grid:rectangle(x,y,x2,y2,skipNil)
local xi,yi = x-1,y
return function()
repeat
xi = xi+1
if xi > x2 then yi = yi + 1; xi = x end
if yi > y2 then return end
local v = grid.get(self,xi,yi)
if v or not skipNil then
return xi,yi,v
end
until v
end
end
function grid:iterate()
local grid,x,t,y,v = self.grid
return function()
repeat
if not y then
x,t = next(grid,x)
end
if not t then return end
y,v = next(t,y)
until v
return x,y,v
end
end
function grid:map(func)
for x,y,v in grid.iterate(self) do
grid.set(self,x,y,func(x,y,v))
end
end
return grid