1 files changed, 76 insertions, 17 deletions
diff --git a/Data/BuiltIn/Libraries/GameLab/Utils/init.lua b/Data/BuiltIn/Libraries/GameLab/Utils/init.lua
index 86bf90e..53188fa 100644
--- a/Data/BuiltIn/Libraries/GameLab/Utils/init.lua
+++ b/Data/BuiltIn/Libraries/GameLab/Utils/init.lua
@@ -1,26 +1,85 @@
 local utils = GameLab.Package("GameLab.Utils")
 
-utils.Clone = function(obj) 
-    local lut = {} 
-
-    local function copy(object) 
-        if type(object) ~= "table" then 
+function utils.Deepcopy(object)
+    local lookup_table = {}
+    local function _copy(object)
+        if type(object) ~= "table" then
             return object
-        elseif lut[object] then 
-            return lut[object]
-        end 
+        elseif lookup_table[object] then
+            return lookup_table[object]
+        end
+        local new_table = {}
+        lookup_table[object] = new_table
+        for index, value in pairs(object) do
+            new_table[_copy(index)] = _copy(value)
+        end
+        return setmetatable(new_table, getmetatable(object))
+    end
+    return _copy(object)
+end
+
+function utils.RunInEnvironment(fn, fnenv)
+	setfenv(fn, fnenv)
+	return xpcall(fn, debug.traceback)
+end
+
+function utils.Reduce(tbl, filterfn)
+	local res = {}
+	for k,v in pairs(tbl) do
+		if filterfn(k,v) then
+			res[k] = v
+		end
+	end
+	return tbl
+end
 
-        local newtable = {} 
-        lut[object] = newtable
+-- concatenate two array-style tables
+function utils.JoinArrays(...)
+	local ret = {}
+	for i,array in ipairs({...}) do
+		for j,val in ipairs(array) do
+			table.insert(ret, val)
+		end
+	end
+	return ret
+end
 
-        for k, v in pairs(object) do 
-            newtable[copy(k)] = copy(value)
-        end 
+-- merge two array-style tables, only allowing each value once
+function utils.ArrayUnion(...)
+	local ret = {}
+	for i,array in ipairs({...}) do
+		for j,val in ipairs(array) do
+			if not table.contains(ret, val) then
+				table.insert(ret, val)
+			end
+		end
+	end
+	return ret
+end
 
-        return setmetatable(newtable, getmetatable(object))
-    end 
+-- merge two map-style tables, overwriting duplicate keys with the latter map's value
+function utils.MergeMaps(...)
+	local ret = {}
+	for i,map in ipairs({...}) do
+		for k,v in pairs(map) do
+			ret[k] = v
+		end
+	end
+	return ret
+end
 
-    return copy(obj)
-end 
+-- Adds 'addition' to the end of 'orig', 'mult' times.
+-- ExtendedArray({"one"}, {"two","three"}, 2) == {"one", "two", "three", "two", "three" }
+function utils.ExtendedArray(orig, addition, mult)
+	local ret = {}
+	for k,v in pairs(orig) do
+		ret[k] = v
+	end
+	mult = mult or 1
+	for i=1,mult do
+		table.insert(ret,addition)
+	end
+	return ret
+end
 
 return utils 
 \ No newline at end of file