Re: normalize-scape.mod.xsl

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On Wed, 2 Jul 2003 21:10:18 +0800
James Devenish <[email protected]> wrote:

> Hi Vitaly,
> 
> New ideas are welcome -- and it would be great for us to
> improve language support -- but each idea needs to be assessed
> for its practical value.
> 
> In message <[email protected]>
> on Wed, Jul 02, 2003 at 03:03:49PM +0400, Vitaly Ostanin wrote:
> > > I, too, would like to have had this. But DocBook XSL
> > > stylesheets, in general, are slow enough already. The
> > > problem with using a recursive template is that it can
> > > easily increase processing time by a factor of five. 
> > 
> > You right, modified style is slow, but XSLT is not for speed.
> 
> It's not for slownees, either! :)

I optimize my version of template name="scape" (attached).
Now it used key() functionality from XSLT.

Top of my normalize-scape.mod.xsl:
  <xsl:key name="entity" match="mapping" use="@key"/>
  <xsl:variable name="latex.mapping.vyt"
     select="document('latex.mapping.xml')"/>

Now speed statistic is (tested with xsltproc --timing --repeat):

original db2latex
Applying stylesheet 20 times took 15469 ms

vyt first (scape.xsl)
Applying stylesheet 20 times took 88864 ms
Saving result took 1 ms

vyt second (scape2.xsl)
Applying stylesheet 20 times took 34364 ms

> > > we will still use the long, monolithic "scape"
> > > template but it will be generated from a mapping file (not
> > > hand-coded).
> > 
> > I'm not sure, that is the right way.
> 
> >From what I have seen, it is the most practical way so far.

May be.

> > > > LaTeX doesn't support unicode characters by their
> > > > numbers, so each character need to be translated into
> > > > valid latex.
> > > 
> > > I haven't found that to be possible (but I'm not an XSLT
> > > expert). 
> > 
> > It's easily doing with characters mapping, without any
> > extensions.
> 
> I don't believe you! If you can find someone who has
> demonstrated that it is practical (or can explain how it could
> be done)  that would help us find a new solution for DB2LaTeX.

I'll try :)

> As far as I can see, you're suggesting that we use
> substring(...) to iterate over every character in text() nodes
> and then do lookups in a 65000-element mapping document(most
> characters will require LaTeX packages to be loaded -- so there
> is always a need for a LaTeX-based solution). It simply isn't
> practical(time, space, software support) to do that.

You can split all mapping base by languages (numbers ranged) and
include only specified.

BTW, you can to have 2 alternative variants: with monolithic
"scape"; and with replaced from mapping base (separated from
latex.mapping.xml).

<skipped/>

-- 
Regards, Vyt
mailto:  [email protected]
JID:     [email protected]

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    <xsl:template name="scape">
      <xsl:param name="string"/>
      <xsl:if test="not(string-length($string)=0)">
        <xsl:variable name="char" select="substring($string,1,1)"/>
        <xsl:for-each select="$latex.mapping.vyt">
          <xsl:choose>
            <xsl:when test="count(key('entity',$char)) &gt; 0">
              <xsl:value-of select="key('entity',$char)/@text"/>
            </xsl:when>
            <xsl:otherwise>
              <xsl:value-of select="$char"/>
            </xsl:otherwise>
          </xsl:choose>
        </xsl:for-each>
        <xsl:call-template name="scape">
          <xsl:with-param name="string" select="substring($string,2)"/>
        </xsl:call-template>
      </xsl:if>
    </xsl:template>

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