Forums » Open Discussion »
Expression Visitor
Added by Anonymous about 19 years ago
Legacy ID: #3397082
Legacy Poster: Eric P. Wittmann (paalin)
I have a small suggestion with regards to analyzing and manipulating an Expression
in Saxon. In particular, I have been using the XQuery API, and I had a need to
statically analyze an XQuery (in order to look for certain function calls etc..).
Currently I use the static query context to compile the query into a XQueryExpression.
Next, I walk the tree using iterateSubExpressions() to find the sub expressions that I
am interested in (primarily FunctionCall instances). The suggestion: it would be really
nice if there was a Visitor pattern here, so that it wouldn't be necessary to do a bunch
of 'instanceof' checks. No big deal - but I think it would make Saxon even more useful
since it could be used easily to parse, analyze, AND actually execute queries.
Legacy ID: #3397239
Legacy Poster: Michael Kay (mhkay)
Yes, I've had this refactoring in mind for a while, but there hasn't been a
requirement that was strong enough to make it happen. Perhaps if I do an
XQuery-to-XQueryX translator... It's the right thing to do, but I don't thing it's
urgent. Michael Kay
Please register to reply
.