Minetest-WorldEditAdditions/worldeditadditions/utils/parse/weighted_nodes.lua

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--- Parses a list of strings as a list of weighted nodes - e.g. like in
-- the //mix command. Example: "dirt 5 stone sand 2".
-- @param parts string[] The list of strings to parse (try worldeditadditions.split)
-- @param as_list bool If true, then table.insert() successive { node = string, weight = number } subtables when parsing instead of populating as an associative array.
-- @param func_normalise callable If specified, the given function will be used to normalise node names instead of worldedit.normalize_nodename. A single argument is passed containing the un-normalised node name, and the return value is assumed to be the normalised node name.
-- @returns table A table in the form node_name => weight.
function worldeditadditions.parse.weighted_nodes(parts, as_list, func_normalise)
if as_list == nil then as_list = false end
local MODE_EITHER = 1
local MODE_NODE = 2
local result = {}
local mode = MODE_NODE
local last_node_name = nil
for i, part in ipairs(parts) do
-- print("i: "..i..", part: "..part)
if mode == MODE_NODE then
-- print("mode: node");
local next
if not func_normalise then next = worldedit.normalize_nodename(part)
else next = func_normalise(part) end
if not next then
return false, "Error: Invalid node name '"..part.."'"
end
last_node_name = next
mode = MODE_EITHER
elseif mode == MODE_EITHER then
-- print("mode: either");
local chance = tonumber(part)
if not chance then
-- print("not a chance, trying a node name")
local node_name
if not func_normalise then node_name = worldedit.normalize_nodename(part)
else node_name = func_normalise(part) end
if not node_name then
return false, "Error: Invalid number '"..tostring(part).."'"
end
if last_node_name then
if as_list then table.insert(result, { node = last_node_name, weight = 1 })
else result[last_node_name] = 1 end
end
last_node_name = node_name
mode = MODE_EITHER
else
-- print("it's a chance: ", chance, "for", last_node_name)
chance = math.floor(chance)
if as_list then table.insert(result, { node = last_node_name, weight = chance })
else result[last_node_name] = chance end
last_node_name = nil
mode = MODE_NODE
end
end
end
if last_node_name then
-- print("caught trailing node name: ", last_node_name)
if as_list then table.insert(result, { node = last_node_name, weight = 1 })
else result[last_node_name] = 1 end
end
return true, result
end