Minetest-WorldEditAdditions/worldeditadditions/utils/node_identification.lua

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local node_id_air = minetest.get_content_id("air")
local node_id_ignore = minetest.get_content_id("ignore")
--- Determines whether the given node/content id is an airlike node or not.
-- It is recommended that the result of this function be cached.
-- @param id number The content/node id to check.
-- @return bool Whether the given node/content id is an airlike node or not.
function worldeditadditions.is_airlike(id)
-- Do a fast check against air and ignore
if id == node_id_air then
return true
elseif id == node_id_ignore then -- ignore = not loaded yet IIRC (so it could be anything)
return false
end
-- If the node isn't registered, then it might not be an air node
if not minetest.registered_nodes[id] then return false end
if minetest.registered_nodes[id].sunlight_propagates == true then
return true
end
-- Check for membership of the airlike group
local name = minetest.get_name_from_content_id(id)
local airlike_value = minetest.get_item_group(name, "airlike")
if airlike_value ~= nil and airlike_value > 0 then
return true
end
-- Just in case
if worldeditadditions.str_starts(this_node_name, "wielded_light") then
return true
end
-- Just in case
return false
end
--- Determines whether the given node/content id is a liquid-ish node or not.
-- It is recommended that the result of this function be cached.
-- @param id number The content/node id to check.
-- @return bool Whether the given node/content id is a liquid-ish node or not.
function worldeditadditions.is_liquidlike(id)
-- print("[is_liquidlike]")
if id == node_id_ignore then return false end
local node_name = minetest.get_name_from_content_id(id)
if node_name == nil or not minetest.registered_nodes[node_name] then return false end
local liquidtype = minetest.registered_nodes[node_name].liquidtype
-- print("[is_liquidlike]", "id", id, "name", node_name, "liquidtype", liquidtype)
if liquidtype == nil or liquidtype == "none" then return false end
-- If it's not none, then it has to be a liquid as the only other values are source and flowing
return true
end
--- Determines whether the given node/content id is a sapling or not.
-- Nodes with the "sapling" group are considered saplings.
-- It is recommended that the result of this function be cached.
-- @param id number The content/node id to check.
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-- @return bool Whether the given node/content id is a sapling or not.
function worldeditadditions.is_sapling(id)
local node_name = minetest.get_name_from_content_id(id)
return minetest.get_item_group(node_name, "sapling") ~= 0
end
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local sapling_aliases = {}
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--- Register a new sapling alias.
-- @param sapling_node_name string The canonical name of the sapling.
-- @param alias string The alias name of the sapling.
-- @returns bool[,string] Whether the alias registration was successful or not. If false, then an error message as a string is also returned as the second value.
function worldeditadditions.register_sapling_alias(sapling_node_name, alias)
if sapling_aliases[sapling_node_name] ~= nil then
return false, "Error: An alias against the node name '"..sapling_node_name.."' already exists."
end
sapling_aliases[alias] = sapling_node_name
return true
end
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--- Convenience function to register many sapling aliases at once.
-- @param tbl [string, string][] A list of tables containing exactly 2 strings in the form { sapling_node_name, alias }.
-- @returns bool[,string] Whether the alias registrations were successful or not. If false, then an error message as a string is also returned as the second value.
function worldeditadditions.register_sapling_alias_many(tbl)
for i, next in ipairs(tbl) do
local success, msg = worldeditadditions.register_sapling_alias(
next[1],
next[2]
)
if not success then return success, msg end
end
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return true
end
--- Returns the current key ⇒ value table of sapling names and aliases.
-- @return table
function worldeditadditions.get_all_sapling_aliases()
return sapling_aliases
end
--- Attempts to normalise a sapling name using the currently registered aliases.
-- @param in_name string The sapling name to normalise
-- @param return_nil_on_failure bool Whether to return nil if we fail to resolve the sapling name with an alias, or return the original node name instead (default: false).
function worldeditadditions.normalise_saplingname(in_name, return_nil_on_failure)
if sapling_aliases[in_name] then return sapling_aliases[in_name]
elseif return_nil_on_failure then return nil
else return in_name end
end