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RE: tokenize() for text wrap

Subject: RE: tokenize() for text wrap
From: "Richard Lewis" <richardlewis@xxxxxxxxxxxxxx>
Date: Thu, 10 Feb 2005 17:42:52 +0000
sed tokenize
Excellent! it works.

I had to add an xsl:non-matching-substring as well because the last
token doesn't match (because it isn't at least 30 chars?)

Thanks for your help.
Richard

On Thu, 10 Feb 2005 17:25:55 -0000, "Michael Kay" <mike@xxxxxxxxxxxx>
said:
> Try
> 
> regex="{$regex}"
> 
> Michael Kay
> http://www.saxonica.com/
>  
> 
> > -----Original Message-----
> > From: Richard Lewis [mailto:richardlewis@xxxxxxxxxxxxxx] 
> > Sent: 10 February 2005 17:13
> > To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> > Subject: RE:  tokenize() for text wrap
> > 
> > 
> > On Thu, 10 Feb 2005 16:39:58 +0000, "Richard Lewis"
> > <richardlewis@xxxxxxxxxxxxxx> said:
> > > 
> > > On Thu, 10 Feb 2005 16:08:34 -0000, "Michael Kay" 
> > <mike@xxxxxxxxxxxx>
> > > said:
> > > > The regex in tokenize() is a regular expression that the 
> > separator must
> > > > match. There's no way of constraining the tokens, only 
> > the separator.
> > > > 
> > > > .{30,} matches any string of 30 characters or more, but 
> > .{30,}? also
> > > > matches
> > > > a zero-length string. I'm not sure what this would 
> > achieve even if it
> > > > worked!
> > > > 
> > > If you test this with sed you'll need a regex like this:
> > > 
> > > echo "string..." | sed "s/\(.\{,30\}\) /\1\n/g"
> > > 
> > > But if you check the wierd regex syntax for XPath:
> > > http://www.w3.org/TR/xpath-functions/#regex-syntax
> > > 
> > > it says "X{n,}? matches X, at least n times". Bizarre, isn't it?
> > > 
> > > > I think you can use xsl:analyze-string for this. Use a 
> > regex that matches
> > > > the required token together with the following separator; 
> > treat these as
> > > > two
> > > > subgroups by parenthesizing the regex, and in the 
> > xsl:matching-substring
> > > > child, pick up the token value as regex-group(1).
> > > > 
> > > OK, I've tried this but I can't work out the right regex. 
> > I've tried:
> > > (.{30,}?\s+)(\s+)
> > > (.{30,}\s+)(\s+)
> > > .{30,}\s+
> > > .{30,}?\s+
> > > 
> > > and they all produce no matches.
> > > 
> > I've got this:
> > 
> > <xsl:variable name="regex">(.{30,}?)\s+</xsl:variable>
> > 
> > <xsl:analyze-string select="normalize-space($text)" regex="$regex"
> > flags="s">
> >     <xsl:matching-substring>
> >         <tspan dy="{...}">
> >             <xsl:value-of select="regex-group(1)" />
> >         </tspan>
> >     </xsl:matching-substring>
> > </xsl:analyze-string>
> > 
> > but there don't seem to be any matching-substrings (or
> > non-matching-substrings), I get no tspan elements in the result tree.
> > 
> > Richard.

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