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[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Selecting previous node in newly-sorted group (not inp
 I have task listings in OPML that looks like the following. I am
trying to write a transform that will point out temporal gaps existing
between the entries of a single day (e.g. 9:00 to 9:15 DNE in sample).
I was making pretty good headway with the for-each-group and sort
constructs, which orders the entries just fine. However, I am unable
to select the previous node of the newly-ordered nodes. I think the
preceding-sibling axis on line 14 is looking back to the document
order and not the newly-ordered nodes. So, I tried to direct my scope
to the current-group with:
14 <xsl:variable name="previous"
select="$todaysentries/preceding-sibling::outline[position()=$previouspositio
n]"/>
But this selects more than one node. I also attempted a multivalue key
with @Date and @Stop to no avail. Does this require use of a sequence
constructor instead of the @use attribute?
Thanks yet again,
Tim Lebo
Input:
<?xml version="1.0" encoding="UTF-8"?>
<opml version="1.0">
<body>
<outline text="2010.1.25">
<outline text="task1" Date="2010.1.25" Start="7:00" Stop="8:00"/>
<outline text="task2" Date="2010.1.25" Start="8:00" Stop="9:00"/>
<outline text="skipped 15 minutes since last stop"
Date="2010.1.25" Start="9:15" Stop="9:30"/>
<outline text="multiple entries within an hour" Date="2010.1.25"
Start="9:30" Stop="9:45"/>
<outline text="multiple entries within an hour out of order"
Date="2010.1.25" Start="9:50" Stop="10:00"/>
<outline text="multiple entries within an hour" Date="2010.1.25"
Start="9:45" Stop="9:50"/>
<outline text="should be before first entry" Date="2010.1.25"
Start="6:00" Stop="7:00"/>
</outline>
</body>
</opml>
XSLT 2.0 (Saxon8b):
2 <xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="2.0">
3 <xsl:output method="text"/>
4
5 <xsl:template match="/">
6 <xsl:for-each-group select="//outline[@Start]" group-by="@Date">
7 <xsl:value-of select="concat(current-grouping-key(),$NL)"/>
8 <xsl:variable name="todaysentries" select="current-group()"/>
9 <xsl:for-each select="current-group()">
10 <xsl:sort select="substring-before(@Start,':')"
data-type="number"/>
11 <xsl:sort select="substring-after(@Start,':')"
data-type="number"/>
12 <xsl:if test="position() > 1">
13 <xsl:variable name="previousposition" select="position() -
1"/>
14 <xsl:variable name="previous"
select="preceding-sibling::outline[position()=$previousposition]"/>
15 <xsl:value-of select="concat(@Date,' prev position
',$previousposition,' stopped ',$previous/@Stop,
16 ' current entry
',@Start,' ',@Stop,$NL)"/>
17 </xsl:if>
18 </xsl:for-each>
19 </xsl:for-each-group>
20 </xsl:template>
21
22 <xsl:variable name="NL">
23 <xsl:text>
24 </xsl:text>
25 </xsl:variable>
26
27 </xsl:transform>
Current Output:
2010.1.25
2010.1.25 prev position 1 stopped current entry 7:00 8:00
2010.1.25 prev position 2 stopped current entry 8:00 9:00
2010.1.25 prev position 3 stopped current entry 9:15 9:30
2010.1.25 prev position 4 stopped current entry 9:30 9:45
2010.1.25 prev position 5 stopped 8:00 current entry 9:45 9:50
2010.1.25 prev position 6 stopped current entry 9:50 10:00
Desired Output:
2010.1.25
2010.1.25 prev position 1 stopped 7:00 current entry 7:00 8:00
2010.1.25 prev position 2 stopped 8:00 current entry 8:00 9:00
2010.1.25 prev position 3 stopped 9:00 current entry 9:15 9:30
2010.1.25 prev position 4 stopped 9:30 current entry 9:30 9:45
2010.1.25 prev position 5 stopped 9:45 current entry 9:45 9:50
2010.1.25 prev position 6 stopped 9:50 current entry 9:50 10:00
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