[ET Trac] [Einstein Toolkit] #798: allow calculations in parameter assignments in parameter files

[Einstein Toolkit]

#798: allow calculations in parameter assignments in parameter files
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  Reporter:  rhaas        |       Owner:        
      Type:  enhancement  |      Status:  review
  Priority:  optional     |   Milestone:        
 Component:  Cactus       |     Version:        
Resolution:               |    Keywords:        
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Comment (by eschnett):

 I believe it is the wrong approach to extend Cactus with home-grown
 syntaxes and parsers. I wish there had been faster progress with attaching
 Python or Lua to Cactus, so that we could use this instead.

 I do not see why there needs to be an equals sign at the beginning. There
 is presumably no difference between "x = 2" and "x = =2", and the
 statement "x = 2*y" is currently ill-defined. If anything, it would give
 the parser more exposure, making it correct more quickly.

 The patch is good, and adds functionality that is very useful and
 currently missing. Please apply, with the suggestion above.

 Tongue-in-cheek I want to suggest to add another feature, namely being
 able to call a function. This will then allow us to run a Cactus
 simulation to determine the value of a parameter...

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/798#comment:2>
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