Subject: Re: [xsl] Find the number of elements that are prior to the seriesof elements that match a string? From: "Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Tue, 12 Mar 2019 20:12:41 -0000 |
> So what is the easiest/clearest/most-clever way in XPath 3 to break a string of arbitrary length into a sequence of strings of a fixed size? > Yes, I was pondering that too en route to my solution to Roger's problem. There's a class of solutions involving string-to-codepoints() and codepoints-to-string(), but that feels inelegant to me. You can use these to implement a split() function that splits a string into N one-character strings, and then use grouping to recombine them. Then there are solutions involving recursion and substring. Something like: partition($string, $size) ==> if ($string) then (substring($string, 1, $size), partition(substring($string, $size+1), $size) else () And there are solutions that go via a sequence of integer positions: partition($string, $size) ==> (1 to string-length($string) idiv $size)) ! substring($string, ., $size) And there are regular expression solutions: <xsl:analyze-string select="$s" regex=".."> <xsl:matching-substring>{.}</xsl:matching-substring> <xsl:non-matching-substring>{.}</xsl:non-matching-substring> </xsl:analyze-string> or fn:analyze-string($s, '..')/*/string() All things considered, I think I'll go with the last one. But it's not quite so attractive if the "fixed size" is dynamically defined rather than being known at compile time. Michael Kay Saxonica
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