On 3 November 2011 12:12, Manfred Staudinger
<manfred(_dot_)staudinger(_at_)gmail(_dot_)com> wrote:
Hi,
Given
<xsl:variable name="t1" select="'Mlmlmhmhmvmv'"/>
then
<xsl:variable name="t4" select="for $i in 1 to string-length($t1) return
if (substring($t1, $i, 1)=('h', 'v')) then 0 else
if (substring($t1, $i, 1)='z') then -1 else 1"/>
<xsl:variable name="t5" select="for $i in 1 to string-length($t1)
return $i + sum(subsequence($t4, 1, $i - 1))"/>
gives me what I want in $t5:
1 3 5 7 9 11 12 14 15 17 18 20
While $t4 isn't very efficient, the construct in $t5 is simply unacceptable
for longer strings: the numbers are added up repeatedly instead of adding
only one number to the previous sum.
Any better solution would be appreciated, thanks!
Instead of substring using
codepoints-to-string(string-to-codepoints($t1)) to get a sequence of
strings (1 char each), then pass that to a recursive function that
sums as it goes, passing the index and subsequence each time.
--
Andrew Welch
http://andrewjwelch.com
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