[ET Trac] [Einstein Toolkit] #1251: Use Parsing Expression Grammar for Par Files

[Einstein Toolkit]

#1251: Use Parsing Expression Grammar for Par Files
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 Reporter:  sbrandt      |       Owner:     
     Type:  enhancement  |      Status:  new
 Priority:  minor        |   Milestone:     
Component:  Other        |     Version:     
 Keywords:               |  
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 Piraha is a parsing framework/library based on Parsing Expression Grammars
 (PEGs).  This allows you to define the grammar of a language using a
 simple regular-expression-type language, and Piraha will use this to
 decode an input file into a hierarchical data structure of the parsed data
 (a "parse tree").  See http://code.google.com/p/piraha-peg/,
 http://en.wikipedia.org/wiki/Parsing_expression_grammar.

 I've hacked a version of Cactus to use Piraha for parameter parsing.
 Please take a look:

 https://svn.cactuscode.org/flesh/branches/with_piraha

 This version is able to run the ET testsuite.

 This version can understand the variables $parfile, $ENV{name}, and $pi
 (which is 3.14...). Variables can be standalone, or be substituted from
 inside strings.

 It can understand mathematical expressions including grouping, order of
 operation, and a few functions (sin, cos, tan, exp, sqrt). Other
 parameters from the parameter file are available for use in mathematical
 expressions.

 Some debug printing is in place so you can get an idea of what's going on.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1251>
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