Re: [Dev-luatex] unique node id?
Is the following 172 something like I need? How would I access that (besides string.gsub())? nodenil 172 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. Patrick ___ dev-luatex mailing list dev-luatex@ntg.nl http://www.ntg.nl/mailman/listinfo/dev-luatex
Re: [Dev-luatex] unique node id?
On 29-8-2010 9:03, Taco Hoekwater wrote: 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())? node nil 172 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. This number uniquely identifies a node for as long as it stays allocated, yes. If it is freed, a new node may have the same number. 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 - ___ dev-luatex mailing list dev-luatex@ntg.nl http://www.ntg.nl/mailman/listinfo/dev-luatex
Re: [Dev-luatex] unique node id?
Am 29.08.2010 um 13:15 schrieb Hans Hagen:
On 29-8-2010 9:03, Taco Hoekwater wrote:
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())?
node nil 172 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.
This number uniquely identifies a node for as long as it stays
allocated, yes. If it is freed, a new node may have the same
number.
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
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
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Re: [Dev-luatex] unique node id?
On 08/29/2010 01:15 PM, Hans Hagen wrote: On 29-8-2010 9:03, Taco Hoekwater wrote: 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())? node nil 172 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. This number uniquely identifies a node for as long as it stays allocated, yes. If it is freed, a new node may have the same number. 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 Not necessarily: there can be different userdata objects for the same node. (I only just now realized that) Best wishes, Taco ___ dev-luatex mailing list dev-luatex@ntg.nl http://www.ntg.nl/mailman/listinfo/dev-luatex
Re: [Dev-luatex] unique node id?
On 29-8-2010 1:22, Patrick Gundlach wrote:
Am 29.08.2010 um 13:15 schrieb Hans Hagen:
On 29-8-2010 9:03, Taco Hoekwater wrote:
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())?
node nil 172 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.
This number uniquely identifies a node for as long as it stays
allocated, yes. If it is freed, a new node may have the same
number.
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
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({}).
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
-
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Re: [Dev-luatex] unique node id?
On 29-8-2010 1:29, Taco Hoekwater wrote:
On 08/29/2010 01:15 PM, Hans Hagen wrote:
On 29-8-2010 9:03, Taco Hoekwater wrote:
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())?
node nil 172 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.
This number uniquely identifies a node for as long as it stays
allocated, yes. If it is freed, a new node may have the same
number.
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
Not necessarily: there can be different userdata objects for the same
node. (I only just now realized that)
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
-
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Re: [Dev-luatex] unique node id?
On 29-8-2010 8:48, Patrick Gundlach wrote: Is the following 172 something like I need? How would I access that (besides string.gsub())? nodenil 172 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. 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 - ___ dev-luatex mailing list dev-luatex@ntg.nl http://www.ntg.nl/mailman/listinfo/dev-luatex
Re: [Dev-luatex] unique node id?
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())? nodenil 172 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. ___ dev-luatex mailing list dev-luatex@ntg.nl http://www.ntg.nl/mailman/listinfo/dev-luatex
Re: [Dev-luatex] unique node id?
On 29-8-2010 1:42, Taco Hoekwater wrote: 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())? node nil 172 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. 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 - ___ dev-luatex mailing list dev-luatex@ntg.nl http://www.ntg.nl/mailman/listinfo/dev-luatex
