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364 lines
13 KiB
Lua
364 lines
13 KiB
Lua
--[==[
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Treasurer
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- A mod for Minetest
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version 0.2.0
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]==]
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--[=[
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TABLE OF CONTENTS
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part 1: Initialization
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part 2: Treasure API
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part 3: Treasure spawning mod handling
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part 4: Internal functions
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]=]
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--[=[
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part 1: Initialization
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]=]
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-- This creates the main table; all functions of this mod are stored in this table
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treasurer = {}
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-- Table which stores all the treasures
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treasurer.treasures = {}
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-- This table stores the treasures again, but this time sorted by groups
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treasurer.groups = {}
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-- Groups defined by the Treasurer API
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treasurer.groups.treasurer = {}
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treasurer.groups.treasurer.default = {}
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-- Groups defined by the Minetest API
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treasurer.groups.minetest = {}
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--[[
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format of treasure table:
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treasure = {
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name, -- treasure name, e.g. mymod:item
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rarity, -- relative rarity on a scale from 0 to 1 (inclusive).
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-- a rare treasure must not neccessarily be a precious treasure
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count, -- count (see below)
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preciousness, -- preciousness or “worth” of the treasure.
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-- ranges from 0 (“scorched stuff”) to 10 (“diamond block”)
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wear, -- wear (see below)
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metadata, -- unused at the moment
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}
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treasures can be nodes or items
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format of count type:
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count = number -- it’s always number times
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count = {min, max} -- it’s pseudorandomly between min and max times, math.random() will be used to chose the value
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count = {min, max, prob_func} -- it’s between min and max times, and the value is given by prob_func (which is not neccessarily random [in the strictly mathematical sense])
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format of wear type:
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completely analogous to count type
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format of prob_func function:
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prob_func = function()
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--> returns a random or pseudorandom number between 0 (inclusive) and 1 (exclusive)
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prob_func is entirely optional, if it’s not used, treasurer will default to math.random.
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You can use prob_func to define your own random function, in case you don’t like an even
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distribution
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format of treasurer_groups:
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This is just a table of strings, each string stands for a group name.
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]]
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--[=[
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part 2: Treasurer API
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]=]
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--[[
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treasurer.register_treasure - registers a new treasure
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(this means the treasure will be ready to be spawned by treasure spawning mods.
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name: name of resulting ItemStack, e.g. “mymod:item”
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rarity: rarity of treasure on a scale from 0 to 1 (inclusive). lower = rarer
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preciousness: preciousness of treasure on a scale from 0 (“scorched stuff”) to 10 (“diamond block”).
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count: optional value which specifies the multiplicity of the item. Default is 1. See count syntax help in this file.
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wear: optional value which specifies the wear of the item. Default is 0, which disables the wear. See wear syntax help in this file.
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treasurer_groups: (optional) a table of group names to assign this treasure to. If omitted, the treasure is added to the default group.
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This function does some basic parameter checking to catch the most obvious mistakes. If invalid parameters have been passed, the input is rejected and the function returns false. However, it does not cover every possible mistake, so some invalid treasures may slip through.
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returns: true on success, false on failure
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]]
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function treasurer.register_treasure(name, rarity, preciousness, count, wear, treasurer_groups )
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--[[ We don’t trust our input, so we first check if the parameters
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have the correct types and refuse to add the treasure if a
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parameter is malformed.
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What follows is a bunch of parameter checks.
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]]
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-- check wheather name is a string
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if type(name) ~= "string" then
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minetest.log("error","[treasure] I rejected a treasure because the name was of type \""..type(name).."\" instead of \"string\".")
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return false
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end
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-- first check if rarity is even a number
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if type(rarity) == "number" then
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-- then check wheather the rarity lies in the allowed range
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if rarity < 0 or rarity > 1 then
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minetest.log("error", "[treasurer] I rejected the treasure \""..tostring(name).."\" because it’s rarity value is out of bounds. (it was "..tostring(rarity)..".)")
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return false
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end
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else
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minetest.log("error","[treasurer] I rejected the treasure \""..tostring(name).."\" because it had an illegal type of rarity. Given type was \""..type(rarity).."\".")
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return false
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end
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-- check if preciousness is even a number
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if type(preciousness) == "number" then
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-- then check wheather the preciousness lies in the allowed range
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if preciousness < 0 or preciousness > 10 then
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minetest.log("error", "[treasurer] I rejected the treasure \""..tostring(name).."\" because it’s preciousness value is out of bounds. (it was "..tostring(preciousness)..".)")
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return false
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end
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else
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minetest.log("error","[treasurer] I rejected the treasure \""..tostring(name).."\" because it had an illegal type of preciousness. Given type was \""..type(preciousness).."\".")
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return false
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end
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-- first check if count is of a correct type
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if type(count) ~= "number" and type(count) ~= "nil" and type(count) ~= "table" then
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minetest.log("error", "[treasurer] I rejected the treasure \""..tostring(name).."\" because it had an illegal type of “count”. Given type was \""..type(count).."\".")
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return false
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end
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-- if count’s a table, check if it’s format is correct
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if type(count) == "table" then
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if(not (type(count[1]) == "number" and type(count[2]) == "number" and (type(count[3]) == "function" or type(count[3]) == "nil"))) then
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minetest.log("error","[treasurer] I rejected the treasure \""..tostring(name).."\" because it had a malformed table for the count parameter.")
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return false
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end
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end
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-- now do the same for wear:
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-- first check if wear is of a correct type
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if type(wear) ~= "number" and type(wear) ~= "nil" and type(wear) ~= "table" then
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minetest.log("error","[treasurer] I rejected the treasure \""..tostring(name).."\" because it had an illegal type of “wear”. Given type was \""..type(wear).."\".")
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return false
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end
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-- if wear’s a table, check if it’s format is correct
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if type(wear) == "table" then
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if(not (type(wear[1]) == "number" and type(wear[2]) == "number" and (type(wear[3]) == "function" or type(wear[3]) == "nil"))) then
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minetest.log("error","[treasurer] I rejected the treasure \""..tostring(name).."\" because it had a malformed table for the wear parameter.")
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return false
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end
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end
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-- check type of treasurer_group
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if type(treasurer_groups) ~= "table" and type(treasurer_groups) ~= "nil" and type(treasurer_groups) ~= "string" then
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minetest.log("error","[treasurer] I rejected the treasure \""..tostring(name).."\" because the treasure_group parameter is of type "..tosting(type(treasurer_groups)).." (expected: nil, string or table).")
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return false
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end
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--[[ End of checks. If we reached this point of the code, all checks have been passed
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and we finally register the treasure.]]
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-- default count is 1
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if count == nil then count = 1 end
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-- default wear is 0
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if wear == nil then wear = 0 end
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local treasure = {
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name = name,
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rarity = rarity,
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count = count,
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wear = wear,
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preciousness = preciousness,
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metadata = "",
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}
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table.insert(treasurer.treasures, treasure)
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--[[ Assign treasure to Treasurer group(s) or default if not provided ]]
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-- default Treasurer group is default
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if treasurer_groups == nil then treasurer_groups = "default" end
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if(type(treasurer_groups) == "string") then
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if(treasurer.groups.treasurer[treasurer_groups] == nil) then
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treasurer.groups.treasurer[treasurer_groups] = {}
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end
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table.insert(treasurer.groups.treasurer[treasurer_groups], treasure)
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elseif(type(treasurer_groups) == "table") then
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for i=1,#treasurer_groups do
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-- assign to Treasurer group (create table if it does not exist yet)
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if(treasurer.groups.treasurer[treasurer_groups[i]] == nil) then
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treasurer.groups.treasurer[treasurer_groups[i]] = {}
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end
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table.insert(treasurer.groups.treasurer[treasurer_groups[i]], treasure)
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end
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end
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minetest.log("info","[treasurer] Treasure successfully registered: "..name)
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return true
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end
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--[=[
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part 3: Treasure spawning mod (TSM) handling
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]=]
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--[[
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treasurer.select_random_treasures - request some treasures from treasurer
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parameters:
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count: (optional) amount of items in the treasure. If this value is nil, treasurer assumes a default of 1.
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min_preciousness: (optional) don’t consider treasures with a lower preciousness. nil = no lower limit
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max_preciousness: (optional) don’t consider treasures with a higher preciousness. nil = no lower limit
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treasurer_groups: (optional): Only consider treasures which are members of at least one of the members of the provided Treasurer group table. nil = consider all groups
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returns:
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a table of ItemStacks (the requested treasures) - may be empty
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on error, it returns false
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]]
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function treasurer.select_random_treasures(count, min_preciousness, max_preciousness, treasurer_groups)
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if #treasurer.treasures == 0 and count >= 1 then
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minetest.log("info","[treasurer] I was asked to return "..count.." treasure(s) but I can’t return any because no treasure was registered to me.")
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return {}
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end
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if count == nil then count = 1 end
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local sum = 0
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local cumulate = {}
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local randoms = {}
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-- copy treasures into helper table
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local p_treasures = {}
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if(treasurer_groups == nil) then
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-- if the group filter is not used (defaul behaviour), copy all treasures
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for i=1,#treasurer.treasures do
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table.insert(p_treasures, treasurer.treasures[i])
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end
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-- if the group filter IS used, copy only the treasures from the said groups
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elseif(type(treasurer_groups) == "string") then
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if(treasurer.groups.treasurer[treasurer_groups] ~= nil) then
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for i=1,#treasurer.groups.treasurer[treasurer_groups] do
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table.insert(p_treasures, treasurer.groups.treasurer[treasurer_groups][i])
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end
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else
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minetest.log("info","[treasurer] I was asked to return "..count.." treasure(s) but I can’t return any because no treasure which fits to the given Treasurer group “"..treasurer_groups.."”.")
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return {}
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end
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elseif(type(treasurer_groups) == "table") then
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for t=1,#treasurer_groups do
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if(treasurer.groups.treasurer[treasurer_groups[t]] ~= nil) then
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for i=1,#treasurer.groups.treasurer[treasurer_groups[t]] do
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table.insert(p_treasures, treasurer.groups.treasurer[treasurer_groups[t]][i])
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end
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end
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end
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else
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minetest.log("error","[treasurer] treasurer.select_random_treasures was called with a malformed treasurer_groups parameter!")
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return false
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end
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if(min_preciousness ~= nil) then
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-- filter out too unprecious treasures
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for t=#p_treasures,1,-1 do
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if((p_treasures[t].preciousness) < min_preciousness) then
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table.remove(p_treasures,t)
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end
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end
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end
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if(max_preciousness ~= nil) then
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-- filter out too precious treasures
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for t=#p_treasures,1,-1 do
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if(p_treasures[t].preciousness > max_preciousness) then
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table.remove(p_treasures,t)
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end
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end
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end
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for t=1,#p_treasures do
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sum = sum + p_treasures[t].rarity
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cumulate[t] = sum
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end
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for c=1,count do
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randoms[c] = math.random() * sum
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end
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local treasures = {}
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for c=1,count do
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for t=1,#p_treasures do
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if randoms[c] < cumulate[t] then
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table.insert(treasures, p_treasures[t])
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break
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end
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end
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end
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local itemstacks = {}
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for i=1,#treasures do
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itemstacks[i] = treasurer.treasure_to_itemstack(treasures[i])
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end
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if #itemstacks < count then
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minetest.log("info","[treasurer] I was asked to return "..count.." treasure(s) but I could only return "..(#itemstacks)..".")
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end
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return itemstacks
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end
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--[=[
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Part 4: internal functions
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]=]
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--[[ treasurer.treasure_to_itemstack - converts a treasure table to an
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ItemStack
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parameter:
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treasure: a treasure (see format in the head of this file)
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returns:
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an ItemStack
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]]
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function treasurer.treasure_to_itemstack(treasure)
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local itemstack = {}
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itemstack.name = treasure.name
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itemstack.count = treasurer.determine_count(treasure)
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itemstack.wear = treasurer.determine_wear(treasure)
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itemstack.metadata = treasure.metadata
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return ItemStack(itemstack)
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end
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--[[
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This determines the count of a treasure by taking the various different
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possible types of the count value into account
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This function assumes that the treasure table is valid.
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returns: the count
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]]
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function treasurer.determine_count(treasure)
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if(type(treasure.count)=="number") then
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return treasure.count
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else
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local min,max,prob = treasure.count[1], treasure.count[2], treasure.count[3]
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if(prob == nil) then
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return(math.floor(min + math.random() * (max-min)))
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else
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return(math.floor(min + prob() * (max-min)))
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end
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end
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end
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--[[
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This determines the wear of a treasure by taking the various different
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possible types of the wear value into account.
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This function assumes that the treasure table is valid.
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returns: the count
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]]
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function treasurer.determine_wear(treasure)
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if(type(treasure.wear)=="number") then
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return treasure.wear
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else
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local min,max,prob = treasure.wear[1], treasure.wear[2], treasure.wear[3]
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if(prob == nil) then
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return(math.floor(min + math.random() * (max-min)))
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else
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return(math.floor(min + prob() * (max-min)))
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end
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end
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end
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