On Thu, 3 Jun 1999, Steve Ball wrote:
> Dear Tclers,
>
> I am working on creating a Tcl extension to James Clark's XT XSL processor,
> using TclBlend.
>
> This seems to boil down to being able to access the Tcl interpreter via a
> static public class. The trouble is, there doesn't appear to be a
> static class
> that refers to the main Tcl interpreter in Java. However, I notice in
> the source
> code (yes, I UTSL'd) that an Interp object is created to wrap around the pointer
> to the C Tcl_Interp structure and that gets squirreled away in a
> variable of the
> Interp class. I figure that all I need is a static class that returns that
> object.
>
> Perhaps an example would illustrate what I'm trying to do.
>
> Here is a XSL stylesheet. XT provides a mechanism to callback into a
> public static
> Java class by referring to that class using a namespace that refers to a
> UIR prefixed
> by "http://www.jclark.com/xt/java/". In an XSL template you then invoke
> a method
> of that class by referring to the XML namespace.
>
> <xsl:stylesheet
> xmlns:xsl="http://www.w3.org/XSL/Transform/1.0"
> xmlns:tcl="http://www.jclark.com/xt/java/tcl.lang.Interp" <!--
> declare tcl namespace -->
> xmlns="http://www.w3.org/TR/REC-html40"
> result-ns="">
>
> <xsl:template match="/">
> <html>
> <xsl:if test="function-available('tcl:eval')"> <!-- use the tcl
> namespace -->
> <p><xsl:value-of select='tcl:eval("clock format [clock seconds]")'/></p>
> </xsl:if>
> </html>
> </xsl:template>
>
> </xsl:stylesheet>
>
> This doesn't work because tcl.lang.Interp is not a static class.
> If there were a public static class, say tcl.lang.Interp.getInterp, that just
> referred to the main interpreter then my example would be:
>
> <xsl:stylesheet
> xmlns:xsl="http://www.w3.org/XSL/Transform/1.0"
> xmlns:tcl="http://www.jclark.com/xt/java/tcl.lang.Interp.getInterp"
> xmlns="http://www.w3.org/TR/REC-html40"
> result-ns="">
>
> <xsl:template match="/">
> <html>
> <xsl:if test="function-available('tcl:eval')">
> <p><xsl:value-of select='tcl:eval("clock format [clock seconds]")'/></p>
> <p><xsl:value-of select='tcl:eval('set a "XSL Rules")'/></p>
> <p><xsl:value-of select='tcl:getVar('a")'/></p>
> </xsl:if>
> </html>
> </xsl:template>
>
> </xsl:stylesheet>
>
> I think that would work.
Nope, no chance. There is no "static" class because you should be able
to have more than one interp in a process. You should be able to create
a single interp in the process and access it within you Java code with
no problems. Just make a static reference to an interpreter reference.
I hope that helps
mo
> Any chance of having that public static class added to TclBlend?
>
> Cheers,
> Steve Ball
>
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