[antlr-interest] A few questions about AST
G R
relationalalgebra at gmail.com
Mon Jun 25 06:53:38 PDT 2007
Hi,
I'm actually testing ANTLR to translate a relational algebra query into SQL
query for my "end of school project". Anyway, reading the wiki and FAQ on
the web site there are still a few things that i don't know how to do.
So here is my first question :
I got this Parser rules
projection
: PROJ LBRACK listAttribut RBRACK relation
-> ^(PROJ listAttribut relation);
listAttribut
: (attribut) (','! attribut)*;
When i look at my AST, i got every attributes as child of my node PROJ. I'd
like to know how can I create an imaginary children "Attributes" to PROJ and
list every attributes in the subtree Attributes.
Instead of having :
PROJ
|______attribut1
|______attribut2
|...
|______relation
I'd like to have
PROJ
|_____Attributs
| |______attribut1
| |______attribut2
|_____relation
The second question is... How can i make a node using a parser rule ? here
is an example : I got the following rule
predicat: elementaryPredicat (logicalOperator elementaryPredicat)*;
// -> ^(logicalOperator elementaryPredicat elementaryPredicat);
logicalOperator
: AND
| OR;
As you can see I've try to make my node using the logical operator but this
don't work.
Is there anyway of doing such things?
Finally, a simple question...How do i parse the AST from my main program in
java ?
Thanks.
G. R.
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