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-- lib/supple/track.lua
--
-- Sandbox (for) Untrusted Procedure Partitioning (in) Lua Engine
--
-- Tracking and logging for debug porpoises.
--
-- Copyright 2012 Daniel Silverstone <dsilvers@digital-scurf.org>
--
-- For licence terms, see COPYING
--
local depth
local track
local function record(...)
if depth then
track[#track+1] = { depth, ... }
end
end
local function enter(...)
if depth then
record(">>>", ...)
depth = depth + 1
end
end
local function leave(...)
if depth then
if depth > 0 then
depth = depth - 1
end
record("<<<", ...)
end
end
local function start_tracking()
depth, track = 0, {}
end
local function stop_tracking()
if track == nil then
return "***NO TRACKING DATA***"
end
local ret = {}
for i = 1, #track do
local ent = track[i]
local pfx = (" "):rep(ent[1])
table.remove(ent, 1)
ret[#ret+1] = pfx .. table.concat(ent, " ")
end
depth, track = nil, {}
return table.concat(ret, "\n")
end
return {
start = start_tracking,
stop = stop_tracking,
enter = enter,
leave = leave,
record = record,
}
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