mirror of
https://github.com/minetest-mods/player_monoids.git
synced 2024-11-15 23:00:38 +01:00
122 lines
2.5 KiB
Lua
122 lines
2.5 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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local modpath = minetest.get_modpath(minetest.get_current_modname()) .. "/"
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player_monoids = {}
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local mon_meta = {}
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mon_meta.__index = mon_meta
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local nop = function() end
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-- A monoid object is a table with the following fields:
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-- def: The monoid definition
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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 actual_def = {}
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for k, v in pairs(def) do
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actual_def[k] = v
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end
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if not actual_def.apply then
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actual_def.apply = nop
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end
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if not actual_def.on_change then
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actual_def.on_change = nop
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end
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mon.def = actual_def
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local p_map = {}
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mon.player_map = p_map
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mon.next_id = 1
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local v_cache = {}
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mon.value_cache = v_cache
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setmetatable(mon, mon_meta)
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minetest.register_on_leaveplayer(function(player)
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local p_name
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if player then
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p_name = player:get_player_name()
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p_map[p_name] = nil
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v_cache[p_name] = nil
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end
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end)
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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, id)
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local p_name = player:get_player_name()
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local def = self.def
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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 = def.fold(p_effects)
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self.value_cache[p_name] = new_total
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def.apply(new_total, player)
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def.on_change(old_total, new_total, player)
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return actual_id
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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 def = self.def
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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 = def.fold(p_effects)
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self.value_cache[p_name] = new_total
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def.apply(new_total, player)
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def.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.def.identity
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end
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dofile(modpath .. "standard_monoids.lua")
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dofile(modpath .. "test.lua")
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