There is a LR-1 generic, table-driven parser in FXSL --anyone is
welcome to use it.
Dimitre.
On Thu, Apr 26, 2012 at 3:28 PM, Michael Kay <mike(_at_)saxonica(_dot_)com>
wrote:
You could try taking a look at Gunther Rademacher's REX parser generator.
I've found it hard to find information about it, other than mentions by
people who have used it for some rather interesting projects. Basically, if
I understand it correctly, given an EBNF grammar, it generates a parser for
that grammar written in XQuery. Most of the examples seem to be parsers for
textual languages (i.e. where the tokens of the language being parsed are
made up of characters) but I don't see any reason in principle why it
shouldn't also parse a language where the tokens of the language are element
nodes.
Michael Kay
Saxonica
On 26/04/2012 22:45, Tiago Freitas wrote:
I need to match patterns on a set of XML documents (all with the same
schema), and when a pattern matches, I need to retrieve the content
and do some specific transformations on that content (no xml output
needed).
Specifically, they are natural language syntactic trees (and
dependencies).
I will have a list of those "patterns", that are similar to regular
expressions, but with elements and attributes.
pseudo-pattern example:
(//ELEMENTx) (node())* (//ELEMENTy[@ATTRIBUTEz]) (node())*
(//@ATTRIBUTEw)
I used XPath syntax inside the parenthesis only. Other quantifiers
could be used...and also specify dependencies between
nodes/attributes, but that is another problem.
This example would match when the xml has ELEMENTx as the first
element, ends with one element that has ATTRIBUTEw, and in between
needs to have an ELEMENTy with ATTRIBUTEz.
Note that I need to match the whole document for each pattern, not
just part of it.
The nesting of elements does not matter in this case (ELEMENTy could
be a child of ELEMENTx, or not), but they need to have that specific
order (in document order).
Example of tree that can appear:
TOP
/ \
X Y
| \ | \
1 2 3 4
Matching patterns could be (node names, assuming no attributes):
X Y
1 * Y
X 3 4
1 * 4
I could use XPath to get each individual node in the pattern, but then
I loose the order...if I do two XPath queries, I don't know the
positions of the results relative to each other.
After matching, I will have rules for each pattern, that specify some
transformations on the content (change order, etc).
Is there any way to do something like this using XSL, XQuery, or other
language? (preferably available in a Java implementation)
Thanks for any pointers.
(Is it ok to cross-post this to an XQuery list? Recommend any?)
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Cheers,
Dimitre Novatchev
---------------------------------------
Truly great madness cannot be achieved without significant intelligence.
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To invent, you need a good imagination and a pile of junk
-------------------------------------
Never fight an inanimate object
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To avoid situations in which you might make mistakes may be the
biggest mistake of all
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Quality means doing it right when no one is looking.
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You've achieved success in your field when you don't know whether what
you're doing is work or play
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I finally figured out the only reason to be alive is to enjoy it.
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