1 files changed, 116 insertions, 0 deletions
diff --git a/meta/whimsical/builtin.lua b/meta/whimsical/builtin.lua
new file mode 100644
index 00000000..6521bb4b
--- /dev/null
+++ b/meta/whimsical/builtin.lua
@@ -0,0 +1,116 @@
+---@meta _
+
+--[[@@@
+---@inner class -> {
+    self.istruly = true
+    self.truly   = self
+    self.falsy   = Class 'never'
+    self.view    = self.name
+}
+---@inner integer -> {
+    self.istruly = true
+    self.truly   = self
+    self.falsy   = Class 'never'
+    self.view    = tostring(self.value)
+}
+---@inner string -> {
+    self.istruly = true
+    self.truly   = self
+    self.falsy   = Class 'never'
+    self.view    = cat.util.viewString(self.value, self.quotation)
+}
+---@inner union -> {
+    self.istruly = function (subs)
+        local istruly = subs[1].istruly
+        if istruly == nil then
+            return nil
+        end
+        if istruly == true then
+            for i = 2, #subs do
+                if subs[i].istruly ~= true then
+                    return nil
+                end
+            end
+            return true
+        else
+            for i = 2, #subs do
+                if subs[i].istruly ~= false then
+                    return nil
+                end
+            end
+            return false
+        end
+        return nil
+    end
+    self.truly = function (subs)
+        local union = Union()
+        for i = 1, #subs do
+            union:add(subs[i].truly)
+        end
+        if union:len() == 0 then
+            return Class 'never'
+        end
+        if union:len() == 1 then
+            return union:first()
+        end
+        return union
+    end
+    self.falsy = function (subs)
+        local union = Union()
+        for i = 1, #subs do
+            union:add(subs[i].falsy)
+        end
+        if union:len() == 0 then
+            return Class 'never'
+        end
+        if union:len() == 1 then
+            return union:first()
+        end
+        return union
+    end
+    self.view = function (subs)
+        local views = {}
+        for i = 1, #subs do
+            views[i] = subs[i].view
+        end
+        if #views == 0 then
+            return 'never'
+        end
+        return table.concat(views, '|')
+    end
+}
+---@class nil -> {
+    self.istruly = false
+    self.truly   = Class 'never'
+    self.falsy   = self
+}
+---@class never -> {
+    self.istruly = nil
+}
+---@class true -> {
+    self.istruly = true
+    self.truly   = self
+    self.falsy   = Class 'never'
+}
+---@class false -> {
+    self.istruly = false
+    self.truly   = Class 'never'
+    self.falsy   = self
+}
+---@class any: { [unknown]: any } -> {
+    self.istruly = nil
+    self.truly   = Class 'truly'
+    self.falsy   = Class 'false' | Class 'nil'
+}
+---@class truly: { [unknown]: any }
+---@class unknown: truly | false
+---@class boolean: true | false
+---@class number
+---@class thread
+---@class table: { [unknown]: any }
+---@class table<K, V>: { [K]: V }
+---@class string: stringlib
+---@class userdata: { [unknown]: any }
+---@class lightuserdata
+---@class function: fun(...): ...
+]]