On 25-08-15 09:39, Bert Verhees wrote:
I would like to know an example or description of an issue in which
Antlr4.5 does not work good enough in the OpenEHR context.
I think that information can help me and other developers really a lot.
I did some shallow research, maybe it can help answering this question
The specs say, antlr4.5 support standard regular expressions
http://meri-stuff.blogspot.nl/2011/09/antlr-tutorial-expression-language.html#LexerBasics
I guess this is not the same as full regular expressions, but what is
missing?
Here are the language features from the various regex engines:
https://en.wikipedia.org/wiki/Comparison_of_regular_expression_engines#Language_features
It seems very natural that Antlr4.5 supports the standard
Java-regex-engine, because that is supporting code one get for free when
programming in Java.
Added by Antlr to the Java regex is recursion. It is described as one of
the key grammar-features.
I am not sure, maybe, recursion in regex context is not the same as
recursion in grammar-context.
I think, these are important issues, because, if Antlr4.5 is used, there
is another code-base then when one of the traditional grammar tools is used.
So, if there is knowledge of shortcomings of Antlr4.5 in the OpenEHR
context, or expected future OpenEHR context, then it is very important
that all developers know about it, so they can avoid running into very
expensive problems.
Bert
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