115 lines
3.5 KiB
Lua
115 lines
3.5 KiB
Lua
-- classes/predicates :: a predicate system, to be an intermediary between condition
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-- solvers and complex conditions. You simply create a predicate with your data and the
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-- solver to create a predicate, then use the Predicate:solve() API to get your response
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-- To create a Predicate, prefer the Predicate.createPredicate instead of Predicate:new()
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-- As it'll allow you to dynamically create simple or complex predicate on the fly
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-- while Predicate:new() will try to create a complex predicate
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--[[
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Copyright © 2021 Kazhnuz
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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the Software, and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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]]
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local Predicate = Object:extend()
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local SimplePredicate = require "framework.classes.predicate.simple"
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function Predicate.createPredicate(data, solver, asker)
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local predicate = nil
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if (type(data) == "table") then
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predicate = Predicate(data, solver, asker)
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end
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if (type(data) == "string") then
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predicate = SimplePredicate(data, solver, asker)
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end
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if (predicate ~= nil) then
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return predicate
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else
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error("Predicate data aren't a table or a string : " .. tostring(data))
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end
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end
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function Predicate:new(data ,solver, asker)
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self.solver = solver
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self.asker = asker
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self.beginAt = 1
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self:setType(data)
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self.notTag = false
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self:setList(data)
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end
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function Predicate:solve()
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local predicateSolved
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if (self.type == "or") then
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predicateSolved = self:solveOr()
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else
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predicateSolved = self:solveAnd()
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end
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if (self.notTag) then
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predicateSolved = (predicateSolved == false)
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end
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return predicateSolved
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end
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-- INTERNAL FUNCTIONS
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-- Handle the complex predicate
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function Predicate:setType(data)
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self.type = "and"
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if (type(data[1]) == "string") then
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if (data[1] == "or") or (data[1] == "and") then
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self.beginAt = 2
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self.type = data[1]
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end
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end
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end
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function Predicate:setList(data)
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self.list = {}
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for i = self.beginAt, #data, 1 do
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if (i == #data) and (data[i] == "not") then
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self.notTag = true
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else
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table.insert(self.list, Predicate.createPredicate(data[i], self.solver, self.asker))
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end
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end
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end
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function Predicate:solveOr()
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for i, predicate in ipairs(self.list) do
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if (predicate:solve()) then
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return true
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end
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end
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return false
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end
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function Predicate:solveAnd()
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for i, predicate in ipairs(self.list) do
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if (not predicate:solve()) then
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return false
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end
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end
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return true
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end
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return Predicate |