Experimental Physics and
Industrial Control System

mdavidsaver via Core-talk <core-talk at aps.anl.gov> · Fri, 27 Aug 2021 14:36:51 -0000

@Dirk, by "what would be allowed." I meant a positive regex.  Omissions
are too easy with a negative character set.  For example, quote
characters.

> WHY?

My main point is that a restricted character makes it easier for future
syntax to be designed around PVD field names.  Be it CALC expressions in
records or in OPI systems like cs-studio.

cf. "pva://SomePVName/subfield/subelement" in cs-studio.  Which
practically excludes '/' in both record and field names.

https://control-system-
studio.readthedocs.io/en/latest/core/pv/doc/index.html#pv-access

As for the specific case of PVXS.  Having a different separator for structure and union allows for fewer std::map lookups, giving faster parsing (PVD does a lot of these lookups...).

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https://bugs.launchpad.net/bugs/1935037

Title:
  Invalid charactor in field name

Status in EPICS Base:
  New

Bug description:
  When creating a group in QSRV, the allowed characters are too
  restrictive

  error:
  Error Group not created: Invalid charactor '-' (45) in field name "BI02-TimeRise" must be A-Z, a-z, 0-9, or '_'

  expected behaviour:
  pva structures should allow for a more liberal set of characters that just what is covered by \w regex metacharacter.

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System