Re: [RFC][patch] XML structured script output (Nmap-script-XML as of 15 July)

[Patrick Donnelly <batrick () batbytes com>]

On Thu, Jul 19, 2012 at 7:08 PM, David Fifield <david () bamsoftware com> wrote:
> I can deal with the field names being lower-case and identifier-like;
> maybe people will even prefer them that way. But the fact that "md5" and
> "sha1" are not on adjacent lines is galling. Maybe a special kind of
> table format that keeps order (i.e., an array of name-value pairs)? That
> would seem to require a higher-level function with which to set output
> values.

You can get an ordered dictionary in Lua with some metamethod magic:

local table = require "table"

function ordered_new ()
  local t = {}
  local reverse = {}
  local order = {}
  local function iterator ()
    for i, key in ipairs(order) do
      coroutine.yield(key, t[key])
    end
  end
  local mt = {
    __newindex = function (t, k, v)
      if reverse[k] then
        rawset(t, k, v)
        if v == nil then
          table.remove(order, reverse[k])
          reverse[k] = nil
        end
      else
        table.insert(order, k)
        reverse[k] = #order
        rawset(t, k, v)
      end
    end,
    __pairs = function (t)
      return coroutine.wrap(iterator)
    end,
  }
  return setmetatable(t, mt)
end

local test = ordered_new()
test.a = 1
test.b = 2
test[1] = 4
test.foo = 3
for k,v in pairs(test) do
  print(k,v)
end

prints:

a       1
b       2
1       4
foo     3


-- 
- Patrick Donnelly
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