Hi All
I have the following rule in a tree grammar (BTW, rewrite = true
here). Both AS_TEXT and AS_NAME are imaginary tokens.
text_block
: ^(AS_TEXT text_option* name? phrase+ )
-> ?????
;
what I want for the ????? part is the rewrite
^(AS_TEXT name phrase+)
if the optional name was present in the input tree, and
^(AS_TEXT { <generated-name> } phrase+)
if no name was present in the input tree. One variant I tried was
text_block
: ^(AS_TEXT text_option* name? phrase+ )
-> ^(AS_TEXT { ($name.tree == null) ? pm.generateName() :
$name.tree } phrase+)
;
where pm is a helper class instance and generateName looks like
CommonTree generateName() {
String name = ....
return new CommonTree( new CommonToken(AS_NAME, name) );
}
First question is, is this a good approach to "filling in a blank" in
a rewritten tree? If not, please advise. If so, I'll post another
message showing what I did and the null pointer exception that results.
Thanks in advance!
.bill
Bill Andersen
Ontology Works, Inc. (www.ontologyworks.com)
3600 O'Donnell Street, Suite 600
Baltimore, MD 21224
Office: +1.410.675.1201
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