Hi,
is there a unique "node id" which I could use for example as a key in a table? Using the node directly somehow doesn't work. I am thinking of something like
n = node.new("glyph")
n.unique_id
Something similar like this would suffice:
print( tostring({}) )
table: 0x100106da0
this id doesn't change for that table.
Is the following 172 something like I need? How would I access that (besides string.gsub())?
On 29-8-2010 9:03, Taco Hoekwater wrote:
but for storing the node's id one can as well use the nodes user object itself as it's equally unique during the livespan of a node and one can compare pointers so the 'id' snippet in the string is not giving more uniqueness than the node user object itself Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------
Am 29.08.2010 um 13:15 schrieb Hans Hagen:
I need to generate some unique text for that node (I am creating a visual representation of a nodelist using graphviz), so I see two choices: a) get some id string or b) create a look table with the nodes as an index and some random string as the value for each node. But somehow b) didn't work. Is there a way to get the "value of a pointer" as a text string in Lua? Such as when you do tostring({}). Patrick
On 29-8-2010 1:22, Patrick Gundlach wrote:
isn't tostring(n) unique enough then? as long is the node is not freed ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------
On 29-8-2010 1:29, Taco Hoekwater wrote:
Sure, and in the beginning we even had problems with the comparison (and I know of a few places in my code that I need to deal with it) but I think that for patricks case the only thing that matters is uniqueness during a certain period (this graph creation i guess) Anyhow, a way out is: local t = {} for ... loop over fields in node ... do t[k] = ... end hash = table.concat(t) -- maybe with some sort on keys beforehand Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------
On 29-8-2010 8:48, Patrick Gundlach wrote:
thinking of it ... luatex could have a flag that would inhibit freeing of nodes (making free a nil-op so to say) so you would get a large mem footprint but that's ok for special cases Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------
On 08/29/2010 08:48 AM, Patrick Gundlach wrote:
Is the following 172 something like I need? How would I access that (besides string.gsub())?
nil : hlist 2> I am currently using this number in the middle via tostring() and gsub(). But I'd still like to know if this can be used as an id.
Not now. Perhaps I should alter tostring() to return only the middle bit.
On 29-8-2010 1:42, Taco Hoekwater wrote:
no. as it's really helpful to see what the nodes point to .. better would be to have a node.tonumber that reports the number Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------
participants (3)
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Hans Hagen -
Patrick Gundlach -
Taco Hoekwater