Re: [graphviz-interest] Intended behaviour of "canon" output

(Just realised that that draft I was writing when GMail died actually
got sent and was the one we were discussing... whoops!)

As I said in the other thread, I don't need these assumptions; I was
just surprised to see the behaviour had changed.

On 13 May 2014 23:21, John Ellson <[email protected]> wrote:
> The language definition in
>     http://www.graphviz.org/content/dot-language
> hasn't changed, but the graph library that implements the core
> graph parsing and data structures has changed from libgraph to libcgraph
> in the three years or so.   So I suspect what you are seeing is some
> syntactically-inconsequential difference in output ordering.
>
> Your ordering assumptions are too strict, I believe.
>
> John
>
>
>
> On 05/13/2014 05:50 AM, Ivan Lazar Miljenovic wrote:
>>
>> What is the intended pretty-printing performed by "dot -Tcanon"?  My
>> understanding from how it seemed to work was that for each
>> graph/subgraph it would produce something like:
>>
>> <graph/subgraph specification> {
>>      [possibly empty list of global attributes]
>>      [possibly empty list of sub-graphs]
>>      [possibly empty list of nodes]
>>      [possibly empty list of edges]
>> }
>>
>> However, at least in 2.38.0 (the last time I checked this behaviour
>> was with 2.30 I think; I skipped a few versions when I realised my
>> installation of Graphviz was old) this is not the case for some
>> graphs: e.g. when applied to the undirected/ER.gv sample graph, whilst
>> each node seems to be specified before any edges its used in, the
>> nodes and edges are now mixed together.
>>
>> Is this the correct/expected behaviour?  I have some code that assumes
>> it's in the old behaviour, so if this isn't the case I'll need to
>> change how I'm parsing the Dot code.
>>
>
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-- 
Ivan Lazar Miljenovic
[email protected]
http://IvanMiljenovic.wordpress.com
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