I currently have a set of 3 or 4 grammars that are a work in progress
that read stored procedures from various DB vendors and output a fairly
generic AST. The AST from each vendor is then re-written via a tree
grammar and lots of tree re-writing (again a work in progress) into a
standard IngresDB AST, which a final tree grammar then prints out in
Ingres DB Procedure syntax. I am currently working towards something
which will eventually be released as an open source project and wondered
if the community might be able to help me solve a few issues.
1) What is the best way for my final tree grammar to output the specific
syntax I need. At the minute I have a tree grammar which has lots of
{System.out.print($a.text)} in and amongst the tree nodes and if
statements which check input.LA(1) and add comma's etc, etc. It makes
the grammar harder to read. Is there a better way of doing this? The
StringTemplates looked like they might be the solution but that is
another thing to learn and I also don't understand how the string
templates print out your syntax once you have converted your AST to a
StringTemplate?
2) I pass the comments in the initial grammars to the hidden stream. Can
anyone point me at the right article to show how I can output these
comments from the hidden stream at the right point in my final grammar?
3) As this is an organically growing process there are many things my
grammars can not yet cope with, there are also features that some
vendors support and others do not. I want to be able to pass these
things into each grammar and kind of 'TODO' tree node so that I can
output them in the final grammar, probably commented out with a message
to the developer to point out they have some manual effort to perform.
Should I use the error handling to do this? Can anyone point me at a
good article or offer any advice on how I should achieve this?
Thanks in advance.
Stuart - A new ANTLR enthusiast!
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