[luatex] Behavior of node lists.

Thu Nov 8 09:15:01 CET 2012

On 11/07/2012 07:37 PM, Stephan Hennig wrote:
> Am 06.07.2011 15:43, schrieb Taco Hoekwater:
>> On 07/04/11 09:06, Paul Isambert wrote:
>>>
>>> The manual says you're in charge of ensuring that in
>>> "node.insert_after(H, N, x)", N is in the list denoted by H. The thing
>>> is, H doesn't seem to matter at all, unless it's nil:
>>
>> Actually H is also useful if N is nil (that is a tail-append the list
>> that starts at H), but it is true that H is generally unused.
>
> If N is known to be non-nil, e.g., a glyph node, is it save to call
>
>    node.insert_after(nil, N, x)  ?
>
> If the answer is 'Yes',

Well, yes. However I do not like the idea of reordering the
arguments, because we have quite a lot of functions with 'head'
argument, and they always come first.

Best wishes,
Taco

> I propose re-ordering parameters of function
> node.insert_after (and node.insert_before), so that head can be easily
> left out in the function call:
>
>    function node.insert_after(<new>, <current>, <head>)
>
> Best regards,
> Stephan Hennig
>