From a1b559a3a269bbee1ae9a33061b08a868ea52f5c Mon Sep 17 00:00:00 2001
From: Bruce Hill <bruce@bruce-hill.com>
Date: Fri, 25 Jan 2019 15:49:29 -0800
Subject: Added metatables for bool, number, function, coroutine. Added
 run-time check to make sure precompiled code used the same version of Lua.
 Methods can now be used in (* compiles to *), etc.

---
 builtin_metatables.lua | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 builtin_metatables.lua

(limited to 'builtin_metatables.lua')

diff --git a/builtin_metatables.lua b/builtin_metatables.lua
new file mode 100644
index 0000000..e579e6c
--- /dev/null
+++ b/builtin_metatables.lua
@@ -0,0 +1,65 @@
+require("text")
+local number_mt = {
+  __type = "a Number",
+  as_lua = tostring,
+  as_nomsu = tostring,
+  as_text = tostring,
+  as_a_number = function(self)
+    return self
+  end,
+  rounded = function(self)
+    return math.floor(self + .5)
+  end,
+  rounded_down = math.floor,
+  rounded_up = math.ceil,
+  to_the_nearest = function(self, rounder)
+    return rounder * math.floor(self / rounder + 0.5)
+  end,
+  base16 = function(self)
+    return ("%X"):format(self)
+  end
+}
+number_mt.__index = number_mt
+debug.setmetatable(0, number_mt)
+local bool_mt = {
+  __type = "a Boolean",
+  as_lua = tostring,
+  as_nomsu = function(self)
+    return self and "yes" or "no"
+  end,
+  as_text = function(self)
+    return self and "yes" or "no"
+  end
+}
+bool_mt.__index = bool_mt
+debug.setmetatable(true, bool_mt)
+local fn_mt = {
+  __type = "an Action",
+  as_text = function(self)
+    return (tostring(self):gsub("function", "Action"))
+  end
+}
+fn_mt.__index = fn_mt
+debug.setmetatable((function() end), fn_mt)
+local co_mt = {
+  __type = "a Coroutine",
+  as_text = function(self)
+    return (tostring(self):gsub("thread", "Coroutine"))
+  end
+}
+co_mt.__index = co_mt
+debug.setmetatable(coroutine.create(function() end), co_mt)
+local nil_mt = {
+  __type = "Nil",
+  as_lua = function(self)
+    return "nil"
+  end,
+  as_nomsu = function(self)
+    return "nil"
+  end,
+  as_text = function(self)
+    return "nil"
+  end
+}
+nil_mt.__index = nil_mt
+return debug.setmetatable(nil, nil_mt)
-- 
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