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<?xml version="1.0" encoding="US-ASCII"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns:exsl="http://exslt.org/common"
                xmlns:func="http://exslt.org/functions"
                xmlns:dtbl="http://docbook.sourceforge.net/dtbl"
                extension-element-prefixes="func"
                exclude-result-prefixes="exsl func dtbl"
                version="1.0">

<func:function name="dtbl:convertLength">
  <xsl:param name="arbitrary.length"/>

  <xsl:variable name="pixels.per.inch" select="96"/>

  <xsl:variable name="unscaled.length"
                select="translate($arbitrary.length, 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz ', '')"/>

  <xsl:variable name="units"
                select="translate($arbitrary.length,'+-0123456789. ', '')"/>

  <xsl:variable name="scaled.length">
    <xsl:choose>
      <xsl:when test="$units='in'">
        <xsl:value-of select="$unscaled.length * $pixels.per.inch"/>
      </xsl:when>
      <xsl:when test="$units='cm'">
        <xsl:value-of select="$unscaled.length * ($pixels.per.inch div 2.54)"/>
      </xsl:when>
      <xsl:when test="$units='mm'">
        <xsl:value-of select="$unscaled.length * ($pixels.per.inch div 25.4)"/>
      </xsl:when>
      <xsl:when test="$units='pc'">
        <xsl:value-of select="$unscaled.length * (($pixels.per.inch div 72) * 12)"/>
      </xsl:when>
      <xsl:when test="$units='pt'">
        <xsl:value-of select="$unscaled.length * ($pixels.per.inch div 72)"/>
      </xsl:when>
      <xsl:when test="$units='px' or $units=''">
        <xsl:value-of select="$unscaled.length"/>
      </xsl:when>
      <xsl:otherwise>
        <xsl:message terminate="no">
          <xsl:text>"</xsl:text>
          <xsl:value-of select="$units"/>
          <xsl:text>" is not a known unit.  Applying scaling factor of 1 instead.</xsl:text>
        </xsl:message>
        <xsl:value-of select="$unscaled.length"/>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:variable>

  <func:result select="round($scaled.length)"/>
</func:function>

<func:function name="dtbl:adjustColumnWidths">
  <xsl:param name="colgroup"/>

  <xsl:if test="$adjustColumnWidths.debug">
    <xsl:message>
      <xsl:text>entering adjustColumnWidths(</xsl:text>
      <xsl:call-template name="dump-fragment">
        <xsl:with-param name="fragment" select="$colgroup"/>
      </xsl:call-template>
      <xsl:text>)</xsl:text>
    </xsl:message>
  </xsl:if>

  <xsl:variable name="expanded.colgroup">
    <xsl:apply-templates select="exsl:node-set($colgroup)/*" mode="dtbl-split-widths"/>
  </xsl:variable>

  <xsl:variable name="absolute.widths.total">
    <xsl:value-of select="sum(exsl:node-set($expanded.colgroup)//col/@abswidth)"/>
  </xsl:variable>

  <xsl:variable name="relative.widths.total">
    <xsl:value-of select="sum(exsl:node-set($expanded.colgroup)//col/@relwidth)"/>
  </xsl:variable>

  <xsl:if test="$adjustColumnWidths.debug">
    <xsl:message>
      <xsl:text>total relative widths = (</xsl:text>
      <xsl:value-of select="$relative.widths.total"/>
      <xsl:text>)</xsl:text>
    </xsl:message>
    <xsl:message>
      <xsl:text>total absolute widths = (</xsl:text>
      <xsl:value-of select="$absolute.widths.total"/>
      <xsl:text>)</xsl:text>
    </xsl:message>
  </xsl:if>

  <xsl:variable name="adjusted.colgroup">
    <xsl:choose>
      <xsl:when test="$relative.widths.total = 0">
        <xsl:if test="$adjustColumnWidths.debug">
          <xsl:message>all widths are absolute</xsl:message>
        </xsl:if>
        <xsl:apply-templates select="exsl:node-set($expanded.colgroup)/*"
                             mode="dtbl-use-absolute-widths"/>
      </xsl:when>
      <xsl:when test="$absolute.widths.total = 0">
        <xsl:if test="$adjustColumnWidths.debug">
          <xsl:message>all widths are relative</xsl:message>
        </xsl:if>
        <xsl:apply-templates select="exsl:node-set($expanded.colgroup)/*"
                             mode="dtbl-use-relative-widths">
          <xsl:with-param name="relative.widths.total"
                          select="$relative.widths.total"/>
        </xsl:apply-templates>
      </xsl:when>
    </xsl:choose>
  </xsl:variable>

  <xsl:variable name="corrected.adjusted.colgroup">
    <xsl:choose>
      <xsl:when test="$relative.widths.total = 0">
        <xsl:copy-of select="$adjusted.colgroup"/>
      </xsl:when>
      <xsl:otherwise>
        <xsl:variable name="widths.total"
                      select="sum(exsl:node-set($adjusted.colgroup)//col/@width)"/>
        <xsl:variable name="n.columns"
                      select="count(exsl:node-set($adjusted.colgroup)//col)"/>
        <xsl:variable name="error"
                      select="100 - $widths.total"/>
        <xsl:variable name="first.bad.column"
                      select="($n.columns - $error) + 1"/>
        <xsl:apply-templates select="exsl:node-set($adjusted.colgroup)/*"
                             mode="dtbl-correct-rounding-error">
          <xsl:with-param name="first.bad.column"
                          select="$first.bad.column"/>
        </xsl:apply-templates>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:variable>

  <xsl:if test="$adjustColumnWidths.debug">
    <xsl:message>
      <xsl:text>result = (</xsl:text>
      <xsl:call-template name="dump-fragment">
        <xsl:with-param name="fragment" select="$corrected.adjusted.colgroup"/>
      </xsl:call-template>
      <xsl:text>)</xsl:text>
    </xsl:message>
  </xsl:if>

  <func:result select="$corrected.adjusted.colgroup"/>
</func:function>

<xsl:template match="colgroup" mode="dtbl-correct-rounding-error">
  <xsl:param name="first.bad.column"/>

  <xsl:if test="$adjustColumnWidths.debug">
    <xsl:message>
      <xsl:text>first.bad.column = (</xsl:text>
      <xsl:value-of select="$first.bad.column"/>
      <xsl:text>)</xsl:text>
    </xsl:message>
  </xsl:if>

  <colgroup>
    <xsl:for-each select="col[position() &lt; $first.bad.column]">
      <xsl:element name="col">
        <xsl:attribute name="width">
          <xsl:value-of select="concat(@width, '%')"/>
        </xsl:attribute>
      </xsl:element>
    </xsl:for-each>
    <xsl:for-each select="col[position() >= $first.bad.column]">
      <xsl:element name="col">
        <xsl:attribute name="width">
          <xsl:value-of select="concat(@width + 1, '%')"/>
        </xsl:attribute>
      </xsl:element>
    </xsl:for-each>
  </colgroup>
</xsl:template>

<xsl:template match="col" mode="dtbl-correct-rounding-error">
  <xsl:param name="relative.widths.total"/>
  <xsl:param name="error"/>

  <xsl:element name="col">
    <xsl:attribute name="width">
      <xsl:value-of select="concat('', round((@relwidth div $relative.widths.total) * 100))"/>
    </xsl:attribute>
    <xsl:apply-templates mode="dtbl-use-absolute-widths"/>
  </xsl:element>
</xsl:template>

<xsl:template match="colgroup" mode="dtbl-use-relative-widths">
  <xsl:param name="relative.widths.total"/>

  <colgroup>
    <xsl:apply-templates mode="dtbl-use-relative-widths">
      <xsl:with-param name="relative.widths.total"
                      select="$relative.widths.total"/>
    </xsl:apply-templates>
  </colgroup>
</xsl:template>

<xsl:template match="col" mode="dtbl-use-relative-widths">
  <xsl:param name="relative.widths.total"/>

  <xsl:element name="col">
    <xsl:attribute name="width">
      <xsl:value-of select="round((@relwidth div $relative.widths.total) * 100)"/>
    </xsl:attribute>
    <xsl:apply-templates mode="dtbl-use-absolute-widths"/>
  </xsl:element>
</xsl:template>

<xsl:template match="colgroup" mode="dtbl-use-absolute-widths">
  <colgroup>
    <xsl:apply-templates mode="dtbl-use-absolute-widths"/>
  </colgroup>
</xsl:template>

<xsl:template match="col" mode="dtbl-use-absolute-widths">
  <xsl:element name="col">
    <xsl:attribute name="width">
      <xsl:value-of select="@abswidth"/>
    </xsl:attribute>
    <xsl:apply-templates mode="dtbl-use-absolute-widths"/>
  </xsl:element>
</xsl:template>

<xsl:template match="colgroup" mode="dtbl-split-widths">
  <colgroup>
    <xsl:apply-templates mode="dtbl-split-widths"/>
  </colgroup>
</xsl:template>

<xsl:template match="col" mode="dtbl-split-widths">

  <!-- width = @width ? @width : '1*' -->
  <xsl:variable name="width">
    <xsl:choose>
      <xsl:when test="@width != ''">
        <xsl:value-of select="@width"/>
      </xsl:when>
      <xsl:otherwise>
        <xsl:text>1*</xsl:text>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:variable>

  <!-- absolute.width = contains($width,'*') ? substring-after($width, '*') : $width -->
  <xsl:variable name="absolute.width">
    <xsl:choose>
      <xsl:when test="contains($width, '*')">
        <xsl:value-of select="substring-after($width, '*')"/>
      </xsl:when>
      <xsl:otherwise>
        <xsl:value-of select="$width"/>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:variable>

  <xsl:variable name="converted.absolute.width">
    <xsl:choose>
      <xsl:when test="$absolute.width != ''">
        <xsl:value-of select="dtbl:convertLength($absolute.width)"/>
      </xsl:when>
     <xsl:otherwise>0</xsl:otherwise>
    </xsl:choose>
  </xsl:variable>

  <xsl:variable name="relative.width">
    <xsl:choose>
      <xsl:when test="substring-before($width, '*') != ''">
        <xsl:value-of select="substring-before($width, '*')"/>
      </xsl:when>
      <xsl:otherwise>0</xsl:otherwise>
    </xsl:choose>
  </xsl:variable>

  <xsl:element name="col">
    <xsl:attribute name="width">
      <xsl:value-of select="$width"/>
    </xsl:attribute>
    <xsl:attribute name="relwidth">
      <xsl:value-of select="$relative.width"/>
    </xsl:attribute>
    <xsl:attribute name="abswidth">
      <xsl:value-of select="$converted.absolute.width"/>
    </xsl:attribute>
    <xsl:apply-templates mode="dtbl-split-widths"/>
  </xsl:element>
</xsl:template>

</xsl:stylesheet>