1 files changed, 46 insertions, 0 deletions
diff --git a/server/src/vm/multi.lua b/server/src/vm/multi.lua
new file mode 100644
index 00000000..91ab4577
--- /dev/null
+++ b/server/src/vm/multi.lua
@@ -0,0 +1,46 @@
+local createValue = require 'vm.value'
+
+local mt = {}
+mt.__index = mt
+mt.type = 'multi'
+
+function mt:push(value)
+    self[#self+1] = value
+end
+
+function mt:first()
+    local value = self[1]
+    if not value then
+        return createValue('nil')
+    end
+    if value.type == 'multi' then
+        return value:first()
+    else
+        return value
+    end
+end
+
+function mt:eachValue(callback)
+    local i = 0
+    for n, value in ipairs(self) do
+        if value.type == 'multi' then
+            if n == #self then
+                value:eachValue(function (_, nvalue)
+                    i = i + 1
+                    callback(i, nvalue)
+                end)
+            else
+                i = i + 1
+                value:first()
+            end
+        else
+            i = i + 1
+            callback(i, value)
+        end
+    end
+end
+
+return function ()
+    local self = setmetatable({}, mt)
+    return self
+end