[tor-bugs] #22279 [Metrics/metrics-lib]: simplify and avoid repetition in ParserHelper methods

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#22279: simplify and avoid repetition in ParserHelper methods
---------------------------------+-----------------------------------
 Reporter:  iwakeh               |          Owner:  karsten
     Type:  enhancement          |         Status:  needs_review
 Priority:  Medium               |      Milestone:  metrics-lib 1.8.0
Component:  Metrics/metrics-lib  |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
 Reviewer:                       |        Sponsor:
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Changes (by karsten):

 * status:  assigned => needs_review


Comment:

 Please review [https://gitweb.torproject.org/user/karsten/metrics-
 lib.git/log/?h=task-22279 my task-22279 branch] for a first try in this
 direction.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22279#comment:4>
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