Grouping by column row values in xsl:fo table - xslt

Question

I am trying to group values of individual column in xsl fo:table, some values not grouped as expected, it get grouped according to previous column's grouped value,
i need individual grouping in columns, check with my xsl and xml file, i am using these files to generate PDF file using apache FOP.
My XSL File
<?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"
xmlns:fo="http://www.w3.org/1999/XSL/Format"
exclude-result-prefixes="#all"
version="3.0">
<xsl:output method="xml" indent="yes"/>
<xsl:template match="data">
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
<fo:layout-master-set>
<fo:simple-page-master master-name="simple"
page-height="8.5in" page-width="11in" margin-top=".5in"
margin-bottom=".5in" margin-left=".5in" margin-right=".5in">
<fo:region-body margin-top="2cm" margin-bottom="2cm" />
<fo:region-before extent="2cm" overflow="hidden" />
<fo:region-after extent="1cm" overflow="hidden" />
</fo:simple-page-master>
</fo:layout-master-set>
<fo:page-sequence master-reference="simple"
initial-page-number="1">
<fo:static-content flow-name="xsl-region-before">
<fo:block font-size="13.0pt" font-family="serif"
padding-after="2.0pt" space-before="4.0pt" text-align="center"
border-bottom-style="solid" border-bottom-width="1.0pt">
<xsl:text>PDF Test</xsl:text>
</fo:block>
</fo:static-content>
<fo:static-content flow-name="xsl-region-after">
<fo:block font-size="12.0pt" font-family="sans-serif"
padding-after="2.0pt" space-before="2.0pt" text-align="center"
border-top-style="solid" border-bottom-width="1.0pt">
<xsl:text>Page</xsl:text>
<fo:page-number />
</fo:block>
</fo:static-content>
<fo:flow flow-name="xsl-region-body">
<xsl:apply-templates select="data-body" />
</fo:flow>
</fo:page-sequence>
</fo:root>
</xsl:template>
<xsl:template match="data-body">
<fo:block text-align="center">
<fo:table table-layout="fixed" width="100%"
border-style="dashed">
<fo:table-column border-style="solid" />
<fo:table-column border-style="solid" />
<fo:table-column border-style="solid" />
<fo:table-header>
<xsl:apply-templates select="table-header" />
</fo:table-header>
<fo:table-body>
<xsl:for-each-group select="table-data" group-adjacent="column-two">
<xsl:apply-templates select="current-group()">
<xsl:with-param name="row-span" select="count(current-group())" tunnel="yes"/>
</xsl:apply-templates>
</xsl:for-each-group>
</fo:table-body>
</fo:table>
</fo:block>
</xsl:template>
<xsl:template match="table-header">
<fo:table-row keep-together.within-page="always"
border-style="solid">
<fo:table-cell>
<fo:block font-size="10pt" font-family="sans-serif"
padding-top="3pt">
<xsl:value-of select="column-one"></xsl:value-of>
</fo:block>
</fo:table-cell>
<fo:table-cell>
<fo:block font-size="10pt" font-family="sans-serif"
padding-top="3pt">
<xsl:value-of select="column-two"></xsl:value-of>
</fo:block>
</fo:table-cell>
<fo:table-cell>
<fo:block font-size="10pt" font-family="sans-serif"
padding-top="3pt">
<xsl:value-of select="column-three"></xsl:value-of>
</fo:block>
</fo:table-cell>
</fo:table-row>
</xsl:template>
<xsl:template match="table-data">
<fo:table-row keep-together.within-page="always"
border-style="solid">
<xsl:apply-templates>
<xsl:with-param name="row-group-index" tunnel="yes" select="position()"/>
</xsl:apply-templates>
</fo:table-row>
</xsl:template>
<xsl:template match="table-data/*">
<fo:table-cell>
<fo:block font-size="10pt" font-family="sans-serif"
padding-top="3pt">
<xsl:value-of select="."></xsl:value-of>
</fo:block>
</fo:table-cell>
</xsl:template>
<xsl:template match="table-data/column-two">
<xsl:param name="row-span" tunnel="yes"/>
<xsl:param name="row-group-index" tunnel="yes"/>
<xsl:choose>
<xsl:when test="$row-span = 1">
<xsl:next-match/>
</xsl:when>
<xsl:when test="$row-span > 1 and $row-group-index = 1">
<fo:table-cell number-rows-spanned="{$row-span}">
<fo:block font-size="10pt" font-family="sans-serif"
padding-top="3pt">
<xsl:value-of select="."></xsl:value-of>
</fo:block>
</fo:table-cell>
</xsl:when>
</xsl:choose>
</xsl:template>
<xsl:template match="table-data/column-three">
<xsl:param name="row-span" tunnel="yes"/>
<xsl:param name="row-group-index" tunnel="yes"/>
<xsl:choose>
<xsl:when test="$row-span = 1">
<xsl:next-match/>
</xsl:when>
<xsl:when test="$row-span > 1 and $row-group-index = 1">
<fo:table-cell number-rows-spanned="{$row-span}">
<fo:block font-size="10pt" font-family="sans-serif"
padding-top="3pt">
<xsl:value-of select="."></xsl:value-of>
</fo:block>
</fo:table-cell>
</xsl:when>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
My XML File
<?xml version="1.0" encoding="UTF-8"?>
<data>
<data-body>
<table-header>
<column-one>Column One</column-one>
<column-two>Column Two</column-two>
<column-three>Column Three</column-three>
</table-header>
<table-data>
<column-one>One</column-one>
<column-two>5000</column-two>
<column-three>Three</column-three>
</table-data>
<table-data>
<column-one>One</column-one>
<column-two>5000</column-two>
<column-three>Three</column-three>
</table-data>
<table-data>
<column-one>One</column-one>
<column-two>1200</column-two>
<column-three>Three</column-three>
</table-data>
<table-data>
<column-one>One</column-one>
<column-two>2000</column-two>
<column-three>Four</column-three>
</table-data>
<table-data>
<column-one>One</column-one>
<column-two>2000</column-two>
<column-three>Four</column-three>
</table-data>
<table-data>
<column-one>One</column-one>
<column-two>1234</column-two>
<column-three>Five</column-three>
</table-data>
<table-data>
<column-one>One</column-one>
<column-two>5666</column-two>
<column-three>Five</column-three>
</table-data>
<table-data>
<column-one>One</column-one>
<column-two>5666</column-two>
<column-three>Five</column-three>
</table-data>
</data-body>
</data>

Answer 1

I think one way to solve that is to use two passes, one which computes and adds the row-span to columns, and the second that transforms to XSL-FO.
In https://xsltfiddle.liberty-development.net/3NSSEuY/2 I have used XSLT 3 and xsl:iterate to implement the first step for a sequence of column names provided as an xs:string* parameter:
<?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"
xmlns:fo="http://www.w3.org/1999/XSL/Format"
exclude-result-prefixes="#all"
version="3.0">
<xsl:param name="columns-to-group" as="xs:string*" select="'column-two', 'column-three'"/>
<xsl:mode name="compute-row-spans" on-no-match="shallow-copy"/>
<xsl:mode name="compute-row-span" on-no-match="shallow-copy"/>
<xsl:template match="data-body" mode="compute-row-spans">
<xsl:iterate select="$columns-to-group">
<xsl:param name="table" select="."/>
<xsl:on-completion select="$table"/>
<xsl:next-iteration>
<xsl:with-param name="table">
<xsl:apply-templates select="$table" mode="compute-row-span">
<xsl:with-param name="column-to-group" tunnel="yes" select="."/>
</xsl:apply-templates>
</xsl:with-param>
</xsl:next-iteration>
</xsl:iterate>
</xsl:template>
<xsl:template match="data-body" mode="compute-row-span">
<xsl:param name="column-to-group" as="xs:string" tunnel="yes"/>
<xsl:copy>
<xsl:apply-templates select="#*"/>
<xsl:apply-templates select="table-header"/>
<xsl:for-each-group select="table-data" group-adjacent="*[name() = $column-to-group]">
<xsl:apply-templates select="current-group()" mode="compute-row-span">
<xsl:with-param name="column-to-group" tunnel="yes" select="$column-to-group"/>
<xsl:with-param name="row-span" select="count(current-group())" tunnel="yes"/>
</xsl:apply-templates>
</xsl:for-each-group>
</xsl:copy>
</xsl:template>
<xsl:template match="table-data" mode="compute-row-span">
<xsl:copy>
<xsl:apply-templates select="#*" mode="#current"/>
<xsl:apply-templates select="*" mode="#current">
<xsl:with-param name="current-row-index" tunnel="yes" select="position()"/>
</xsl:apply-templates>
</xsl:copy>
</xsl:template>
<xsl:template match="table-data/*" mode="compute-row-span">
<xsl:param name="column-to-group" tunnel="yes"/>
<xsl:param name="row-span" tunnel="yes"/>
<xsl:param name="current-row-index" tunnel="yes"/>
<xsl:choose>
<xsl:when test="name() = $column-to-group and $row-span > 1">
<xsl:if test="$current-row-index = 1">
<xsl:copy>
<xsl:apply-templates select="#*" mode="#current"/>
<xsl:attribute name="row-span" select="$row-span"/>
<xsl:apply-templates mode="#current"/>
</xsl:copy>
</xsl:if>
</xsl:when>
<xsl:otherwise>
<xsl:next-match/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:output method="xml" indent="yes"/>
<xsl:template match="data">
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
<fo:layout-master-set>
<fo:simple-page-master master-name="simple"
page-height="8.5in" page-width="11in" margin-top=".5in"
margin-bottom=".5in" margin-left=".5in" margin-right=".5in">
<fo:region-body margin-top="2cm" margin-bottom="2cm" />
<fo:region-before extent="2cm" overflow="hidden" />
<fo:region-after extent="1cm" overflow="hidden" />
</fo:simple-page-master>
</fo:layout-master-set>
<fo:page-sequence master-reference="simple"
initial-page-number="1">
<fo:static-content flow-name="xsl-region-before">
<fo:block font-size="13.0pt" font-family="serif"
padding-after="2.0pt" space-before="4.0pt" text-align="center"
border-bottom-style="solid" border-bottom-width="1.0pt">
<xsl:text>PDF Test</xsl:text>
</fo:block>
</fo:static-content>
<fo:static-content flow-name="xsl-region-after">
<fo:block font-size="12.0pt" font-family="sans-serif"
padding-after="2.0pt" space-before="2.0pt" text-align="center"
border-top-style="solid" border-bottom-width="1.0pt">
<xsl:text>Page</xsl:text>
<fo:page-number />
</fo:block>
</fo:static-content>
<fo:flow flow-name="xsl-region-body">
<xsl:apply-templates select="data-body" />
</fo:flow>
</fo:page-sequence>
</fo:root>
</xsl:template>
<xsl:template match="data-body">
<fo:block text-align="center">
<fo:table table-layout="fixed" width="100%"
border-style="dashed">
<fo:table-column border-style="solid" />
<fo:table-column border-style="solid" />
<fo:table-column border-style="solid" />
<fo:table-header>
<xsl:apply-templates select="table-header" />
</fo:table-header>
<xsl:variable name="table-with-row-spans">
<xsl:apply-templates select="." mode="compute-row-spans"/>
</xsl:variable>
<fo:table-body>
<xsl:apply-templates select="$table-with-row-spans/data-body/table-data"/>
</fo:table-body>
</fo:table>
</fo:block>
</xsl:template>
<xsl:template match="table-header">
<fo:table-row keep-together.within-page="always"
border-style="solid">
<fo:table-cell>
<fo:block font-size="10pt" font-family="sans-serif"
padding-top="3pt">
<xsl:value-of select="column-one"></xsl:value-of>
</fo:block>
</fo:table-cell>
<fo:table-cell>
<fo:block font-size="10pt" font-family="sans-serif"
padding-top="3pt">
<xsl:value-of select="column-two"></xsl:value-of>
</fo:block>
</fo:table-cell>
<fo:table-cell>
<fo:block font-size="10pt" font-family="sans-serif"
padding-top="3pt">
<xsl:value-of select="column-three"></xsl:value-of>
</fo:block>
</fo:table-cell>
</fo:table-row>
</xsl:template>
<xsl:template match="table-data">
<fo:table-row keep-together.within-page="always"
border-style="solid">
<xsl:apply-templates/>
</fo:table-row>
</xsl:template>
<xsl:template match="table-data/*">
<fo:table-cell>
<fo:block font-size="10pt" font-family="sans-serif"
padding-top="3pt">
<xsl:apply-templates/>
</fo:block>
</fo:table-cell>
</xsl:template>
<xsl:template match="table-data/*[#row-span]">
<fo:table-cell number-rows-spanned="{#row-span}">
<fo:block font-size="10pt" font-family="sans-serif"
padding-top="3pt">
<xsl:apply-templates/>
</fo:block>
</fo:table-cell>
</xsl:template>
</xsl:stylesheet>