Re: [xsl] Re: Count leading spaces using xpath expression

[Grainne Reilly <greilly1@xxxxxxxxx>]

Beautiful!  Thanks Dimitre and Jeff for your elegant solutions both of 
which do the trick nicely.
Grainne.


At 09:50 PM 12/3/2002 -0800, you wrote:

> --- Grainne Reilly  wrote:
>
> > Hi,
> > I am looking for a way to count the number of leading spaces in the
> > text of
> > an element.  I have written the following template which does this:
> >
> >       <xsl:template name="countIndent">
> >               <xsl:param name="str" />
> >               <xsl:param name="leadingSpaces" select="0"/>
> >               <xsl:choose>
> >                       <xsl:when test="(string-length($str) != 0) and
> > (normalize-space(substring($str, 1, 1)) = '' )" >
> >                                       <xsl:call-template 
> name="countIndent">
> >                                       <xsl:with-param name="str" 
> select="substring($str, 2)" />
> >                                       <xsl:with-param 
> name="leadingSpaces" select="$leadingSpaces +
> > 1"/>
> >                               </xsl:call-template>
> >                       </xsl:when>
> >                       <xsl:otherwise>
> >                               <xsl:value-of select="$leadingSpaces" />
> >                       </xsl:otherwise>
> >               </xsl:choose>
> >       </xsl:template>
> >
> > However, I'd like to get this information as an xpath expression (so
> > I
> > can
> > use it in a predicate e.g. /myElement[(indent expression) > 3]). Is
> > this
> > possible (it would only have to work for spaces, not all whitespace)?
> > Thanks for any advice.
> > Grainne.
>
> Hi Graine,
>
> Use:
>
> string-length(
>               substring-before(translate($x,
>                                          translate($x, ' ', ''),
>                                          'Z'
>                                           ),
>                                'Z'
>                                )
>               )
>
>
>
> This is the double translate technique used by Mile Kay sometimes ago.
>
> The inner translate() gets a string of all non-space characters in $x.
> The outer translate() replaces the first non-space character in $x with
> 'Z'.
>
> Then we have a string which is the same as the initial one, but the
> first non-space character now is "Z'.
>
> The rest is easy -- the group of leading spaces is immediately before
> this 'Z', so we can get it using substring-before().
>
> Then string-length() gives us the length of the group of leading
> spaces.
>
> So, if we have defined $x to contain '    xyz a b c  ' (four leading
> spaces and three trailing), the above expression is evaluated to:
>
> 4
>
>
> Hope this helped.
>
>
>
> =====
> Cheers,
>
> Dimitre Novatchev.
> http://fxsl.sourceforge.net/ -- the home of FXSL
>
> __________________________________________________
> Do you Yahoo!?
> Yahoo! Mail Plus - Powerful. Affordable. Sign up now.
> http://mailplus.yahoo.com
>
>  XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list



XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list