I did such work 15 years ago, using the FXSL generic LR-1 parser (the
function func-lrParse:
https://github.com/dnovatchev/FXSL-XSLT2/blob/master/f/func-lrParse.xsl )
One can find the modification to YACC to produce the LR-parsing tables in
XML format, at:
https://github.com/dnovatchev/FXSL-XSLT2/tree/master/Tools/YACCX
A full XPath 2.0 grammar definition in BNF, understandable by YACC, is
here:
https://github.com/dnovatchev/FXSL-XSLT2/blob/master/newWork/XPATH-Grammar.y
The LR-parsing tables for that XPath 2.0 grammar, produced by YACC are
here:
https://github.com/dnovatchev/FXSL-XSLT2/blob/master/newWork/XPATH-ParseTables.xml
And a test that parses several (randomly chosen by me at the time) XPath
2.0 expressions is here:
https://github.com/dnovatchev/FXSL-XSLT2/blob/master/newWork/XPathParse1.xsl
Cheers,
Dimitre
On Wed, Mar 25, 2020 at 10:31 AM Wendell Piez wapiez(_at_)wendellpiez(_dot_)com
<
xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:
XSL Friends,
What kinds of advice can you offer on the question of parsing XPath in
XSLT?
I am currently having to interpret XPath or (more likely) an XPath
subset into an abstract representation that can be rewritten into
various forms. Naturally I would like to do this out of a parse tree
or the functional equivalent, represented in some sort of XML, since
serializing that back out is easy enough. It is producing that tree
that is a problem. I need a parser for XPath or if not for all of
XPath, then at least for my subset -- which includes namespaces. So
even if partial the model must expose names and namespaces to the
extent that a path rewriter can (for example) map into a new set of
namespace prefixes --
Any thoughts? Open source projects I should take a look at? Have the
community-standards initiatives captured any good work in this area?
Best regards,
Wendell
--
...Wendell Piez... ...wendell -at- nist -dot- gov...
...wendellpiez.com... ...pellucidliterature.org... ...pausepress.org...
...github.com/wendellpiez... ...gitlab.coko.foundation/wendell...
--
Cheers,
Dimitre Novatchev
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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
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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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To achieve the impossible dream, try going to sleep.
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Facts do not cease to exist because they are ignored.
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Typing monkeys will write all Shakespeare's works in 200yrs.Will they write
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Sanity is madness put to good use.
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I finally figured out the only reason to be alive is to enjoy it.
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