Re: Minimum typing in a Table

[Julien Desgats <julien.desgats@...>]

Here is a minimal version (without any check, though) which convert
camel case names into hyphen-separated strings. But the behavior can
be unexpected if there is digits or special characters into keys.

Type = setmetatable({}, {
  __index = function(t, key)
    local name = key:gsub("%u%l*", function(s) return s:upper().."-"
end) .. "MAP"
    t.key = name -- cache the name to allow fast further access
    return name
  end
})

print(Type.Arabia, Type.GoldRush)

If you really need to constraint possible input values, you can put a
"set" of available keys in metatable and check it :

Type = setmetatable({}, {
  keys = {
    Arabia = true,
    GoldRush = true,
  },
  __index = function(t, key)
    if not getmetatable(t).keys[key] then return nil end -- if key is
not allowed, return nil
    local name = key:gsub("%u%l*", function(s) return s:upper().."-"
end) .. "MAP"
    t.key = name
    return name
  end
})

2011/6/11 PROXiCiDE <saiyuk7@gmail.com>:
> Hi is there a way to minimize the repeat typing of such.. -MAP at the end?
> say...
>
>  Normal Version
>      Type = {
>         Arabia = "ARABIA-MAP",
>         Archipelago = "ARCHIPELAGO-MAP",
>         Baltic = "BALTIC-MAP",
>         Coastal = "COASTAL-MAP",
>         Continental = "CONTINENTAL-MAP",
>         CraterLake = "CRATER-LAKE-MAP",
>         Fortress = "FORTRESS-MAP",
>         GoldRush = "GOLD-RUSH-MAP",
>         Highland = "HIGHLAND-MAP",
>         Islands = "ISLANDS-MAP",
>         Mediterranean = "MEDITERRANEAN-MAP",
>         Migration = "MIGRATION-MAP",
>         Rivers = "RIVERS-MAP",
>         TeamIslands = "TEAMISLANDS-MAP",
>         Scenario = "SCENARIO-MAP"
>      }
>
>  Minimal Version?? If possible
>      Type = Map {
>         Arabia,
>         Archipelago,
>         ....so on and so on
>      }
>
>
>