[luatex] Behavior of node lists.

Thu Nov 8 11:40:54 CET 2012

On 11/8/2012 9:15 AM, Taco Hoekwater wrote:
> 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.

indeed reordering in no option

(we could consider a two argument variant i.e. if two arguments, then 
assume N, x)

> 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
>>
>

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