[antlr-interest] Unfolding of loops with antlr?
jpschewe at mtu.net
Thu Dec 27 15:38:59 PST 2007
Terence Parr wrote:
> On Dec 27, 2007, at 8:12 AM, Jon Schewe wrote:
>> Given the discussion here I've taken another look at custom AST walkers
>> and found that it's really not that difficult to write an AST walker if
>> you do a good job creating the tree in the parser with rewrite rules. I
>> haven't rewritten the whole grammar yet, but have written an example
>> that contains most of the elements and found it very manageable. Thank
>> you for the suggestions to look in another direction.
> Beware of simple walkers. They are great if you want to print out
> every node or count them. They cannot, however, answer important
> questions such as "am I in this context?". You cannot apply actions
> that are appropriate only in certain contexts very easily without
> grammatical context.
I'm not sure where you are getting at here, but I don't seem to have any
of these problems. I've enhanced the AST to make it clear what context
I'm in and I'm parsing a simple language that just contains variable
declarations and equations and loops.
Jon Schewe | http://mtu.net/~jpschewe
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