example/simple-example.lua


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-- example/simple-example.lua
--
-- Sandbox (for) Untrusted Procedure Partitioning (in) Lua Engine
--
-- Simple example
--
-- Copyright 2012 Daniel Silverstone <dsilvers@digital-scurf.org>
--
-- For licence terms, see COPYING
--

supple = require'supple'

-- Code string to run in the untrusted environment
subcode = [[
local t = ...
local tot = 0
for i = 1, #t do
  tot = tot + t[i]()
end
t.tot = tot
return tot, -t
]]

-- Generate a function to return 'n'
local function give_n(n)
      return function() return n end
end

-- A useful table for the test
local tab = {
      give_n(4),
      give_n(8),
      give_n(12),
}

-- A metatable which defines -tab to equal 'JEFF'
local mt = {
   __unm = function () return "JEFF" end
}

setmetatable(tab, mt)

-- Finally, run the subcode
print(supple.host.run(subcode, "@test-code", tab))
assert(tab.tot == 24)