mirror of https://github.com/kepler155c/opus
32 lines
866 B
Lua
32 lines
866 B
Lua
local addNode(self, node, nextNode, ed)
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if not self._pathDB[node] then self._pathDB[node] = {} end
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self._pathDB[node][ed] = (nextNode == ed and node or nextNode)
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end
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-- Path lookupTable
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local lookupTable = {}
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lookupTable.__index = lookupTable
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function lookupTable:new()
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local lut = {_pathDB = {}}
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return setmetatable(lut, lookupTable)
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end
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function lookupTable:addPath(path)
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local st, ed = path._nodes[1], path._nodes[#path._nodes]
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for node, count in path:nodes() do
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local nextNode = path._nodes[count+1]
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if nextNode then addNode(self, node, nextNode, ed) end
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end
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end
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function lookupTable:hasPath(nodeA, nodeB)
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local found
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found = self._pathDB[nodeA] and self._path[nodeA][nodeB]
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if found then return true, true end
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found = self._pathDB[nodeB] and self._path[nodeB][nodeA]
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if found then return true, false end
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return false
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end
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return lookupTable |