+ return minetest.registered_items[name].groups[group]
+end
+
+function minetest.get_node_group(name, group)
+ return minetest.get_item_group(name, group)
+end
+
+function minetest.string_to_pos(value)
+ local p = {}
+ p.x, p.y, p.z = string.match(value, "^([%d.-]+)[, ] *([%d.-]+)[, ] *([%d.-]+)$")
+ if p.x and p.y and p.z then
+ p.x = tonumber(p.x)
+ p.y = tonumber(p.y)
+ p.z = tonumber(p.z)
+ return p
+ end
+ local p = {}
+ p.x, p.y, p.z = string.match(value, "^%( *([%d.-]+)[, ] *([%d.-]+)[, ] *([%d.-]+) *%)$")
+ if p.x and p.y and p.z then
+ p.x = tonumber(p.x)
+ p.y = tonumber(p.y)
+ p.z = tonumber(p.z)
+ return p
+ end
+ return nil
+end
+
+assert(minetest.string_to_pos("10.0, 5, -2").x == 10)
+assert(minetest.string_to_pos("( 10.0, 5, -2)").z == -2)
+assert(minetest.string_to_pos("asd, 5, -2)") == nil)
+
+function minetest.setting_get_pos(name)
+ local value = minetest.setting_get(name)
+ if not value then
+ return nil
+ end
+ return minetest.string_to_pos(value)
+end
+
+-- To be overriden by protection mods
+function minetest.is_protected(pos, name)
+ return false
+end
+
+function minetest.record_protection_violation(pos, name)
+ for _, func in pairs(minetest.registered_on_protection_violation) do
+ func(pos, name)
+ end