advanced_npc/utils.lua

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-- Basic utilities to work with table operations in Lua, and specific querying
-- By Zorman2000
npc.utils = {}
function npc.utils.array_contains(array, item)
--minetest.log("Array: "..dump(array))
--minetest.log("Item being searched: "..dump(item))
for i = 1, #array do
--minetest.log("Equals? "..dump(array[i] == item))
if array[i] == item then
return true
end
end
return false
end
function npc.utils.array_is_subset_of_array(set, subset)
local match_count = 0
for j = 1, #subset do
for k = 1, #set do
if subset[j] == set[k] then
match_count = match_count + 1
end
end
end
-- Check match count
return match_count == #subset
end
function npc.utils.get_map_keys(map)
local result = {}
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for key, _ in pairs(map) do
table.insert(result, key)
end
return result
end
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function npc.utils.get_map_values(map)
local result = {}
for _, value in pairs(map) do
table.insert(result, value)
end
return result
end
-- This function searches for a node given the conditions specified in the
-- query object, starting from the given start_pos and up to a certain, specified
-- range.
-- Query object:
-- search_type: determines the direction to search nodes.
-- Valid values are: orthogonal, cross, cube
-- - orthogonal search means only nodes which are parallel to the search node's faces
-- will be considered. This limits the search to only 6 nodes.
-- - cross search will look at the same nodes as orthogonal, plus will also
-- check nodes diagonal to the node four horizontal nodes. This search looks at 14 nodes
-- - cube search means to look every node surrounding the node, including all diagonals.
-- This search looks at 26 nodes.
-- search_nodes: array of nodes to search for
-- surrounding_nodes: object specifying which neighbor nodes are to be expected and
-- at which locations. Valid keys are:
-- - North (+Z dir)
-- - East (+x dir)
-- - South (-Z dir)
-- - West (-X dir)
-- - Top (+Y dir)
-- - Bottom (-Y dir)
-- Example: ["bottom"] = {nodes={"default:dirt"}, criteria="all"}
-- Each object will contain nodes, and criteria for acceptance.
-- Criteria values are:
-- - any: true as long as one of the nodes on this side is one of the specified
-- in "nodes"
-- - all: true when the set of neighboring nodes on this side contain one or many of
-- the specified "nodes"
-- - all-exact: true when the set of neighboring nodes on this side contain all nodes
-- specified in "nodes"
-- - shape: true when the set of neighboring nodes on this side contains nodes in
-- the exact given shape. If so, nodes will not be an array, but a 2d array
-- of three rows and three columns, with the specific shape. Notice that
-- the nodes on the side can vary depending on the search type (orthogonal,
-- cross, cube)
function npc.utils.search_node(query, start_pos, range)
end