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Re: [xsl] RE: XSL-FO and Z-index


Subject: Re: [xsl] RE: XSL-FO and Z-index
From: Jesper Tverskov <jesper.tverskov@xxxxxxxxx>
Date: Fri, 21 Sep 2012 09:36:19 +0200

Thanks for help and suggestions.

I have improved my "solution" with this one liner, replacing 13 lines of code:

<xsl:variable name="seq-of-character-counts" select="for $i in
$seq-of-words[position()] return concat(string-length($i), ' ')"
as="item()+"/>

Below I bring the improved solution at the moment just made as a
stylesheet that returns line count for easy testing.

I still have my doubts if it could be implemented in a way that would
work also in border cases. But the alternative background image hack,
has the problem that it is not easy to fine tune the table layout in a
configuration file (for many tables in one go), you must also make a
new image.

The second alternative of hiding the last rows of the table under the
following container, which Ken helped me with, is attractive, but at
the moment I have it only working, if the following container is the
footer of the page.

There is a another table before that footer, that is the last handful
of table rows in our table must hide under that other table, and I
have the feeling that in order to do that I need to use Z-index, which
as far as I know (?) is not yet supported in Apache FOP, at least I
don't have it working yet.

Cheers
Jesper Tverskov
http://www.xmlplease.com

improved solution:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
exclude-result-prefixes="xs" version="2.0">
    <xsl:output indent="yes"/>

    <xsl:template name="start">
        <xsl:variable name="text">Lorem ipsum dolor sit amet,
consectetur adipisicing elit, sed do
            eiusmod tempor incididunt ut labore et dolore magna
aliqua. Ut enim ad minim veniam,
            quis nostrud exercitation ullamco laboris nisi ut aliquip
ex ea commodo consequat. Duis
            aute irure dolor in reprehenderit in voluptate velit esse
cillum dolore eu fugiat nulla
            pariatur. Excepteur sint occaecat cupidatat non proident,
sunt in culpa qui officia
            deserunt mollit anim id est laborum.</xsl:variable>

        <xsl:variable name="number-of-lines">
            <xsl:call-template name="create-sequence-of-character-counts">
                <xsl:with-param name="text" select="$text"/>
                <xsl:with-param name="maxLineLength" select="80"/>
            </xsl:call-template>
        </xsl:variable>

        <!-- Output -->
        <xsl:value-of select="$number-of-lines"/>
    </xsl:template>

    <xsl:template name="create-sequence-of-character-counts">
        <xsl:param name="text"/>
        <xsl:param name="maxLineLength"/>
        <xsl:variable name="seq-of-words"
select="tokenize(normalize-space($text), ' ')"/>
        <!-- string-length of spaces + 1 = number of items -->
        <xsl:variable name="number-of-items"
            select="string-length(replace(normalize-space($text),
'\S', '')) + 1"/>

        <xsl:variable name="seq-of-character-counts" select="for $i in
$seq-of-words[position()] return concat(string-length($i), ' ')"
as="item()+"/>

       <!-- Needed to prevent recursion from spinning out of control -->
        <xsl:for-each select="$seq-of-character-counts[position()]">
            <xsl:if test="$maxLineLength le xs:integer(.)">
                <xsl:message terminate="yes" select="'One or more
words are longer than maxLineLength'"/>
            </xsl:if>
        </xsl:for-each>

        <xsl:call-template name="seqCounts2lines">
            <xsl:with-param name="seqCounts"
select="$seq-of-character-counts" as="item()+"/>
            <xsl:with-param name="number-of-items" select="$number-of-items"/>
            <xsl:with-param name="maxLineLength" select="$maxLineLength"/>
        </xsl:call-template>
    </xsl:template>

    <xsl:template name="seqCounts2lines">
        <xsl:param name="seqCounts"/>
        <xsl:param name="number-of-items" as="xs:integer"/>
        <xsl:param name="itemSum" select="0" as="xs:integer"/>
        <xsl:param name="nextItem" select="1" as="xs:integer"/>
        <xsl:param name="lines" select="1" as="xs:integer"/>
        <xsl:param name="maxLineLength"/>
        <xsl:choose>
            <xsl:when test="$nextItem le ($number-of-items)">
                <xsl:choose>
                    <xsl:when
                        test="$itemSum +
xs:integer(subsequence($seqCounts, $nextItem, 1)) lt $maxLineLength">
                        <xsl:call-template name="seqCounts2lines">
                            <xsl:with-param name="itemSum"
                                select="$itemSum +
xs:integer(subsequence($seqCounts, $nextItem, 1))"/>
                            <xsl:with-param name="nextItem"
select="$nextItem + 1" as="xs:integer"/>
                            <xsl:with-param name="seqCounts"
select="$seqCounts" as="item()+"/>
                            <xsl:with-param name="number-of-items"
select="$number-of-items"/>
                            <xsl:with-param name="lines"
select="$lines" as="xs:integer"/>
                            <xsl:with-param name="maxLineLength"
select="$maxLineLength"/>
                        </xsl:call-template>
                    </xsl:when>
                    <xsl:otherwise>
                        <xsl:call-template name="seqCounts2lines">
                            <xsl:with-param name="itemSum" select="0"/>
                            <xsl:with-param name="nextItem"
select="$nextItem" as="xs:integer"/>
                            <xsl:with-param name="seqCounts"
select="$seqCounts" as="item()+"/>
                            <xsl:with-param name="number-of-items"
select="$number-of-items"/>
                            <xsl:with-param name="lines"
select="$lines + 1" as="xs:integer"/>
                            <xsl:with-param name="maxLineLength"
select="$maxLineLength"/>
                        </xsl:call-template>
                    </xsl:otherwise>
                </xsl:choose>
            </xsl:when>
            <xsl:otherwise>
                <xsl:value-of select="$lines"/>
            </xsl:otherwise>
        </xsl:choose>
    </xsl:template>
</xsl:stylesheet>


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