Re: List of stylesheet parameters?

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It's not possible to provide run-time access to ALL variables, because =
many variables (both local and global) are eliminated or rewritten at =
compile time. For example a variable has no detectable existence at =
run-time if it was found to be unused, or if it was inlined, or if it =
was replaced by a different variable (for example replacing a variable =
bound to @price with one that's bound to data(@price)).

You'll see this if you look at a Saxon stack-trace after a dynamic error =
- it shows the variables that exist at run-time, which may exclude some =
that existed at compile time, and also include others that were =
generated by the compiler.

Michael Kay
Saxonica



> On 18 Nov 2021, at 15:25, Dimitre Novatchev <[email protected]> =
wrote:
>=20
> In July I asked this on the XML.com Slack #xpath-ng channel (and your =
question is exactly one use-case for this proposal):
>=20
> https://xmlcom.slack.com/archives/C01GVC3JLHE/p1625534819029200 =
<https://xmlcom.slack.com/archives/C01GVC3JLHE/p1625534819029200>
>=20
> Dimitre Novatchev <https://app.slack.com/team/U01F9LEC4SE>  6:26 PM =
<https://xmlcom.slack.com/archives/C01GVC3JLHE/p1625534819029200>
> Question: AFAIK we don't have an XPath function that returns all =
variables/parameters  that are in context, do we?
> Please, correct me if I am wrong.Having such a function will be useful =
for debugging and other goals. Any thoughts?
>=20
> There was a thread on this with 27 responses, most positive, the =
question got 7 thumbs-up, but I am not aware of anything been done =
further.
>=20
> Probably must add this as an official proposal on =
https://github.com/qt4cg/qtspecs/issues =
<https://github.com/qt4cg/qtspecs/issues>
>=20
>=20
> Thanks,
> Dimitre
>=20
> On Wed, Nov 17, 2021 at 11:16 AM Graydon Saunders =
<[email protected] <mailto:[email protected]>> wrote:
> Hello!
>=20
> I am pretty sure there isn't a way to do this, but maybe I'm wrong.
>=20
> In current Saxon -- 10.* -- using XSLT 3.0, is there some way to get a =
list of the stylesheet parameters? =20
>=20
> The intent is to then check that they all have values assigned, since =
one of the ways the "call this stylesheet" step of the processing chain =
fails is "oops, that needs a value".  There's an extension function, =
saxon:tunnel-params(), that would be just the thing if it were =
saxon:in-scope-params().
>=20
> (If not, an explicit list of parameters will work.  I am hoping for a =
more elegant solution.)
>=20
> Thanks!
>=20
> ---
> Graydon Saunders  | [email protected] <mailto:[email protected]>
> =C3=9E=C3=A6s ofer=C3=A9ode, =C3=B0isses sw=C3=A1 m=C3=A6g.
> -- Deor  ("That passed, so may this.")
> _______________________________________________
> saxon-help mailing list archived at http://saxon.markmail.org/ =
<http://saxon.markmail.org/>
> [email protected] =
<mailto:[email protected]>
> https://lists.sourceforge.net/lists/listinfo/saxon-help =
<https://lists.sourceforge.net/lists/listinfo/saxon-help>
>=20
> --=20
> Cheers,
> Dimitre Novatchev
> ---------------------------------------
> Truly great madness cannot be achieved without significant =
intelligence.
> ---------------------------------------
> To invent, you need a good imagination and a pile of junk
> -------------------------------------
> Never fight an inanimate object
> -------------------------------------
> To avoid situations in which you might make mistakes may be the
> biggest mistake of all
> ------------------------------------
> Quality means doing it right when no one is looking.
> -------------------------------------
> You've achieved success in your field when you don't know whether what =
you're doing is work or play
> -------------------------------------
> To achieve the impossible dream, try going to sleep.
> -------------------------------------
> Facts do not cease to exist because they are ignored.
> -------------------------------------
> Typing monkeys will write all Shakespeare's works in 200yrs.Will they =
write all patents, too? :)
> -------------------------------------
> Sanity is madness put to good use.
> -------------------------------------
> I finally figured out the only reason to be alive is to enjoy it.
> =20
> _______________________________________________
> saxon-help mailing list archived at http://saxon.markmail.org/
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/saxon-help


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">It's =
not possible to provide run-time access to ALL variables, because many =
variables (both local and global) are eliminated or rewritten at compile =
time. For example a variable has no detectable existence at run-time if =
it was found to be unused, or if it was inlined, or if it was replaced =
by a different variable (for example replacing a variable bound to =
@price with one that's bound to data(@price)).<div class=3D""><br =
class=3D""></div><div class=3D"">You'll see this if you look at a Saxon =
stack-trace after a dynamic error - it shows the variables that exist at =
run-time, which may exclude some that existed at compile time, and also =
include others that were generated by the compiler.</div><div =
class=3D""><br class=3D""></div><div class=3D"">Michael Kay</div><div =
class=3D"">Saxonica<br class=3D""><div class=3D""><br =
class=3D""></div><div class=3D""><br class=3D""><div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D"">On 18 =
Nov 2021, at 15:25, Dimitre Novatchev &lt;<a =
href=3D"mailto:[email protected]" =
class=3D"">[email protected]</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div dir=3D"ltr" =
class=3D"">In July I asked this on the <a href=3D"http://XML.com" =
class=3D"">XML.com</a> Slack #xpath-ng channel (and your question is =
exactly one use-case for this proposal):<br class=3D""><br class=3D""><a =
href=3D"https://xmlcom.slack.com/archives/C01GVC3JLHE/p1625534819029200" =
class=3D"">https://xmlcom.slack.com/archives/C01GVC3JLHE/p1625534819029200=
</a><br class=3D""><br class=3D""><div =
class=3D"gmail-c-virtual_list__item" tabindex=3D"-1" role=3D"presentation"=
 style=3D"top: 1157.7px;" id=3D"gmail-1625468400000divider"><div =
class=3D"gmail-c-message_list__day_divider"><div =
class=3D"gmail-c-message_list__day_divider__line"></div></div></div><div =
class=3D"gmail-c-virtual_list__item" tabindex=3D"0" role=3D"listitem" =
style=3D"top: 1197.7px;" id=3D"gmail-1625534819.029200"><div =
role=3D"presentation" class=3D"gmail-c-message_kit__background =
gmail-c-message_kit__background--hovered =
gmail-p-message_pane_message__message gmail-c-message_kit__message"><div =
role=3D"document" class=3D"gmail-c-message_kit__hover =
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class=3D"gmail-c-message_kit__actions--default =
gmail-c-message_kit__actions" style=3D""><div =
class=3D"gmail-c-message_kit__gutter"><div role=3D"presentation" =
class=3D"gmail-c-message_kit__gutter__left"></div></div></div></div></div>=
</div><span class=3D"gmail-c-message__sender =
gmail-c-message_kit__sender"><a target=3D"_blank" rel=3D"noopener =
noreferrer" aria-haspopup=3D"menu" aria-expanded=3D"false" =
class=3D"gmail-c-link gmail-c-message__sender_link" =
href=3D"https://app.slack.com/team/U01F9LEC4SE" tabindex=3D"-1">Dimitre =
Novatchev<span aria-label=3D"(opens in new tab)" =
class=3D""></span></a></span>&nbsp;&nbsp;<a class=3D"gmail-c-link =
gmail-c-timestamp" =
href=3D"https://xmlcom.slack.com/archives/C01GVC3JLHE/p1625534819029200" =
tabindex=3D"-1"><span class=3D"gmail-c-timestamp__label">6:26 =
PM</span></a><br class=3D""><div class=3D"gmail-c-message_kit__blocks =
gmail-c-message_kit__blocks--rich_text"><div =
class=3D"gmail-c-message__message_blocks =
gmail-c-message__message_blocks--rich_text"><div =
class=3D"gmail-p-block_kit_renderer"><div =
class=3D"gmail-p-block_kit_renderer__block_wrapper =
gmail-p-block_kit_renderer__block_wrapper--first"><div =
class=3D"gmail-p-rich_text_block" dir=3D"auto"><div =
class=3D"gmail-p-rich_text_section">Question: AFAIK we don't have an =
<span class=3D"gmail-c-mrkdwn__highlight">XPath</span> function that =
returns all variables/parameters&nbsp; that are in context, do =
we?</div><div class=3D"gmail-p-rich_text_section"><span =
class=3D"gmail-c-mrkdwn__br"></span>Please, correct me if I am =
wrong.<span class=3D"gmail-c-mrkdwn__br"></span>Having such a function =
will be useful for debugging and other goals. Any thoughts?<br =
class=3D""><br class=3D"">There was a thread on this with 27 responses, =
most positive, the question got 7 thumbs-up, but I am not aware of =
anything been done further.<br class=3D""><br class=3D"">Probably must =
add this as an official proposal on <a =
href=3D"https://github.com/qt4cg/qtspecs/issues" =
class=3D"">https://github.com/qt4cg/qtspecs/issues</a></div><div =
class=3D"gmail-p-rich_text_section"><br class=3D""><br =
class=3D"">Thanks,</div><div =
class=3D"gmail-p-rich_text_section">Dimitre</div></div></div></div></div><=
/div></div><br class=3D""><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Wed, Nov 17, 2021 at 11:16 AM Graydon Saunders =
&lt;<a href=3D"mailto:[email protected]" =
class=3D"">[email protected]</a>&gt; wrote:<br =
class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0px =
0px 0px 0.8ex;border-left:1px solid =
rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr" class=3D""><div =
class=3D"gmail_default" style=3D"font-size:small">Hello!<br =
class=3D""></div><div class=3D"gmail_default" =
style=3D"font-size:small"><br class=3D""></div><div =
class=3D"gmail_default" style=3D"font-size:small">I am pretty sure there =
isn't a way to do this, but maybe I'm wrong.</div><div =
class=3D"gmail_default" style=3D"font-size:small"><br =
class=3D""></div><div class=3D"gmail_default" style=3D"font-size:small">In=
 current Saxon -- 10.* -- using XSLT 3.0, is there some way to get a =
list of the stylesheet parameters?&nbsp;&nbsp;</div><div =
class=3D"gmail_default" style=3D"font-size:small"><br =
class=3D""></div><div class=3D"gmail_default" =
style=3D"font-size:small">The intent is to then check that they all have =
values assigned, since one of the ways the "call this stylesheet" step =
of the processing chain fails is "oops, that needs a value".&nbsp; =
There's an extension function, saxon:tunnel-params(), that would be just =
the thing if it were saxon:in-scope-params().</div><div =
class=3D"gmail_default" style=3D"font-size:small"><br =
class=3D""></div><div class=3D"gmail_default" =
style=3D"font-size:small">(If not, an explicit list of parameters will =
work.&nbsp; I am hoping for a more elegant solution.)</div><div =
class=3D"gmail_default" style=3D"font-size:small"><br =
class=3D""></div><div class=3D"gmail_default" =
style=3D"font-size:small">Thanks!</div><div class=3D"gmail_default" =
style=3D"font-size:small"><br class=3D""></div><div =
class=3D"gmail_default" style=3D"font-size:small">---<br =
class=3D"">Graydon Saunders &nbsp;| <a =
href=3D"mailto:[email protected]" target=3D"_blank" =
class=3D"">[email protected]</a><br class=3D"">=C3=9E=C3=A6s =
ofer=C3=A9ode, =C3=B0isses sw=C3=A1 m=C3=A6g.<br class=3D"">-- Deor =
&nbsp;("That passed, so may this.")<br class=3D""></div></div>
_______________________________________________<br class=3D"">
saxon-help mailing list archived at <a href=3D"http://saxon.markmail.org/"=
 rel=3D"noreferrer" target=3D"_blank" =
class=3D"">http://saxon.markmail.org/</a><br class=3D"">
<a href=3D"mailto:[email protected]" target=3D"_blank" =
class=3D"">[email protected]</a><br class=3D"">
<a href=3D"https://lists.sourceforge.net/lists/listinfo/saxon-help" =
rel=3D"noreferrer" target=3D"_blank" =
class=3D"">https://lists.sourceforge.net/lists/listinfo/saxon-help</a> =
</blockquote></div><br clear=3D"all" class=3D""><div class=3D""><br =
class=3D""></div>-- <br class=3D""><div dir=3D"ltr" =
class=3D"gmail_signature"><div class=3D"">Cheers,</div><div =
class=3D"">Dimitre Novatchev</div><div =
class=3D"">---------------------------------------</div><div =
class=3D"">Truly great madness cannot be achieved without significant =
intelligence.</div><div =
class=3D"">---------------------------------------</div><div class=3D"">To=
 invent, you need a good imagination and a pile of junk</div><div =
class=3D"">-------------------------------------</div><div =
class=3D"">Never fight an inanimate object</div><div =
class=3D"">-------------------------------------</div><div class=3D"">To =
avoid situations in which you might make mistakes may be the</div><div =
class=3D"">biggest mistake of all</div><div =
class=3D"">------------------------------------</div><div =
class=3D"">Quality means doing it right when no one is =
looking.</div><div =
class=3D"">-------------------------------------</div><div =
class=3D"">You've achieved success in your field when you don't know =
whether what you're doing is work or play</div><div =
class=3D"">-------------------------------------</div><div class=3D"">To =
achieve the impossible dream, try going to sleep.</div><div =
class=3D"">-------------------------------------</div><div =
class=3D"">Facts do not cease to exist because they are =
ignored.</div><div =
class=3D"">-------------------------------------</div><div =
class=3D"">Typing monkeys will write all Shakespeare's works in =
200yrs.Will they write all patents, too? :)</div><div =
class=3D"">-------------------------------------</div><div =
class=3D"">Sanity is madness put to good use.</div><div =
class=3D"">-------------------------------------</div><div class=3D"">I =
finally figured out the only reason to be alive is to enjoy =
it.</div><div class=3D"">&nbsp;</div></div>
_______________________________________________<br class=3D"">saxon-help =
mailing list archived at <a href=3D"http://saxon.markmail.org/" =
class=3D"">http://saxon.markmail.org/</a><br class=3D""><a =
href=3D"mailto:[email protected]" =
class=3D"">[email protected]</a><br =
class=3D"">https://lists.sourceforge.net/lists/listinfo/saxon-help =
</div></blockquote></div><br class=3D""></div></div></body></html>=

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