Re: params to __tostring
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- Subject: Re: params to __tostring
- From: Coda Highland <chighland@...>
- Date: 2012年11月10日 11:51:44 -0800
On Sat, Nov 10, 2012 at 11:49 AM, Wesley Smith <wesley.hoke@gmail.com> wrote:
>> To print an array, object, whatever... in "tree view" with indentation, we
>> need to pass a nesting/indent level, and also the set of previously visited
>> tables to avoid inf recursion. If the function performing tostring for each
>> type accepts these parameters and deals with them, but __tostring does not
>> forward them, then we need to check the type of each sub-item to explicitely
>> call this function, instead of relying on the magic __tostring mechanism.
>
> For the indent level, can't you just have every node tostring() itself
> as normal and then have the parent add an indent? That way the indent
> would accumulate and you wouldn't need any extra parameters:
>
> function __tostring(t)
> local res = {}
> for i=1, #t do
> res[i] = '\t'..tostring(t[i])
> end
> return table.concat(res, "\n")
> end
>
Think for a moment why that wouldn't work -- the \t would only be
added to the first line of a subtable.
/s/ Adam