Lua: all steps and self-hosting.

Also some misc docs/TODO updates.

1 files changed, 53 insertions, 0 deletions

diff --git a/lua/utils.lua b/lua/utils.lua
new file mode 100644
index 0000000..1ed03e1
--- /dev/null
+++ b/lua/utils.lua
@@ -0,0 +1,53 @@
+local M = {}
+
+function M.try(f, catch_f)
+    local status, exception = pcall(f)
+    if not status then
+        catch_f(exception)
+    end
+end
+
+function M.instanceOf(subject, super)
+    super = tostring(super)
+    local mt = getmetatable(subject)
+
+    while true do
+        if mt == nil then return false end
+        if tostring(mt) == super then return true end
+        mt = getmetatable(mt)
+    end
+end
+
+--[[
+function M.isArray(o)
+    local i = 0
+    for _ in pairs(o) do
+        i = i + 1
+        if o[i] == nil then return false end
+    end
+    return true
+end
+]]--
+
+function M.map(func, obj)
+    local new_obj = {}
+    for i,v in ipairs(obj) do
+        new_obj[i] = func(v)
+    end
+    return new_obj
+end
+
+function M.dump(o)
+   if type(o) == 'table' then
+      local s = '{ '
+      for k,v in pairs(o) do
+         if type(k) ~= 'number' then k = '"'..k..'"' end
+         s = s .. '['..k..'] = ' .. M.dump(v) .. ','
+      end
+      return s .. '} '
+   else
+      return tostring(o)
+   end
+end
+
+return M