Add global and types libraries

1 files changed, 27 insertions, 0 deletions

@@ -0,0 +1,27 @@
+--- lam.types
+
+local types = {}
+
+types.luatype = type
+
+function types.lamtype (x)
+        if types.luatype(x) == "string" then
+                return "Symbol"
+        elseif types.luatype(x) == "number" then
+                return "Number"
+        elseif getmetatable(x) and getmetatable(x).__type then
+                return getmetatable(x).__type
+        elseif types.luatype(x) == "table" then
+                return "List"
+        else
+                return types.luatype(x)
+        end
+end
+
+types["number?"] = function (x) return types.lamtype(x) == "Number" end
+types["symbol?"] = function (x) return types.lamtype(x) == "Symbol" end
+types["list?"] = function (x) return types.lamtype(x) == "List" end
+types["null?"] = function (x) return x == {} end
+
+---
+return types