mirror of
https://github.com/minetest-mods/player_monoids.git
synced 2024-11-15 14:50:40 +01:00
84 lines
2.2 KiB
Lua
84 lines
2.2 KiB
Lua
-- Copyright (c) raymoo 2016
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-- Licensed under Apache 2.0 license. See COPYING for details.
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-- Any documentation here are internal details, please avoid using them in your
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-- mod.
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player_monoids = {}
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-- Needed for removing players from monoid lists when they leave.
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local player_maps = {}
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local mon_meta = {}
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mon_meta.__index = mon_meta
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-- A monoid object is a table with the following fields:
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-- player_map: A map from player names to their effect tables. Effect tables
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-- are maps from effect IDs to values.
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-- value_cache: A map from player names to the cached value for the monoid.
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-- next_id: The next unique ID to assign an effect.
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local function monoid(def)
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local mon = {}
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local player_map = {}
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mon.players = player_map
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table.insert(player_maps, player_map)
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mon.next_id = 1
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setmetatable(mon, mon_methods)
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return mon
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end
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player_monoids.make_monoid = monoid
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function mon_meta:add_change(player, value)
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local p_name = player:get_player_name()
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local p_effects = self.player_map[p_name]
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if p_effects == nil then
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p_effects = {}
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self.player_map[p_name] = p_effects
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end
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local actual_id
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if id then
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actual_id = id
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else
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actual_id = self.next_id
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self.next_id = actual_id + 1
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end
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local old_total = self.value_cache[p_name]
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p_effects[actual_id] = value
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local new_total = self.fold(p_effects)
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self.value_cache[p_name] = new_total
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self.apply(new_total, player)
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self.on_change(old_total, new_total, player)
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end
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function mon_meta:del_change(player, id)
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local p_name = player:get_player_name()
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local p_effects = self.player_map[p_name]
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if p_effects == nil then return end
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local old_total = self.value_cache[p_name]
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p_effects[id] = nil
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local new_total = self.fold(p_effects)
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self.value_cache[p_name] = new_total
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self.apply(new_total, player)
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self.on_change(old_total, new_total, player)
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end
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function mon_meta:value(player)
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local p_name = player:get_player_name()
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return self.value_cache[p_name] or self.identity
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end
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