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misc/scripts/detect_cycle.py
author Aurelien Campeas <aurelien.campeas@logilab.fr>
Thu, 14 Nov 2013 17:17:02 +0100 (2013-11-14)
changeset 9361 0542a85fe667
parent 6198 f8dea560703f
child 10589 7c23b7de2b8d
permissions -rw-r--r--
symmetric relations: replace bogus rql2sql translation by a hook The hook ensures X r Y => Y r X iff r is symmetric. The rql-no-hook data importer receives a small amendment but note that: * there exist no test for it * its actual semantics are undefined Hence we cannot prove this hunk breaks nothing, because we cannot prove anything. Closes #3259713.
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6198
f8dea560703f add a small c-c shell script to detect cycle for a given relation
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset 
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f8dea560703f
add a small c-c shell script to detect cycle for a given relation



Sylvain Thénault <sylvain.thenault@logilab.fr>


parents: 

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     2


try:












f8dea560703f
add a small c-c shell script to detect cycle for a given relation



Sylvain Thénault <sylvain.thenault@logilab.fr>


parents: 

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     3


    rtype, = __args__












f8dea560703f
add a small c-c shell script to detect cycle for a given relation



Sylvain Thénault <sylvain.thenault@logilab.fr>


parents: 

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     4


except ValueError:












f8dea560703f
add a small c-c shell script to detect cycle for a given relation



Sylvain Thénault <sylvain.thenault@logilab.fr>


parents: 

diff
changeset




     5


    print 'USAGE: cubicweb-ctl shell <instance> detect_cycle.py -- <relation type>'












f8dea560703f
add a small c-c shell script to detect cycle for a given relation



Sylvain Thénault <sylvain.thenault@logilab.fr>


parents: 

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     6


    print












f8dea560703f
add a small c-c shell script to detect cycle for a given relation



Sylvain Thénault <sylvain.thenault@logilab.fr>


parents: 

diff
changeset




     7














f8dea560703f
add a small c-c shell script to detect cycle for a given relation



Sylvain Thénault <sylvain.thenault@logilab.fr>


parents: 

diff
changeset




     8


graph = {}












f8dea560703f
add a small c-c shell script to detect cycle for a given relation



Sylvain Thénault <sylvain.thenault@logilab.fr>


parents: 

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     9


for fromeid, toeid in rql('Any X,Y WHERE X %s Y' % rtype):












f8dea560703f
add a small c-c shell script to detect cycle for a given relation



Sylvain Thénault <sylvain.thenault@logilab.fr>


parents: 

diff
changeset




    10


    graph.setdefault(fromeid, []).append(toeid)












f8dea560703f
add a small c-c shell script to detect cycle for a given relation



Sylvain Thénault <sylvain.thenault@logilab.fr>


parents: 

diff
changeset




    11














f8dea560703f
add a small c-c shell script to detect cycle for a given relation



Sylvain Thénault <sylvain.thenault@logilab.fr>


parents: 

diff
changeset




    12


from logilab.common.graph import get_cycles












f8dea560703f
add a small c-c shell script to detect cycle for a given relation



Sylvain Thénault <sylvain.thenault@logilab.fr>


parents: 

diff
changeset




    13














f8dea560703f
add a small c-c shell script to detect cycle for a given relation



Sylvain Thénault <sylvain.thenault@logilab.fr>


parents: 

diff
changeset




    14


for cycle in get_cycles(graph):












f8dea560703f
add a small c-c shell script to detect cycle for a given relation



Sylvain Thénault <sylvain.thenault@logilab.fr>


parents: 

diff
changeset




    15


    print 'cycle', '->'.join(str(n) for n in cycle)














cubicweb