EXSLT - date:week-in-year - EXSLT Function Implementation

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date:week-in-year()

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Supported Version: 3
XML Definition: date.week-in-year.xml
Source: date.week-in-year.function.xsl

Source

<xsl:param name="date:date-time"
           select="'2000-01-01T00:00:00Z'" />
<date:month-lengths>
   <date:month>31</date:month>
   <date:month>28</date:month>
   <date:month>31</date:month>
   <date:month>30</date:month>
   <date:month>31</date:month>
   <date:month>30</date:month>
   <date:month>31</date:month>
   <date:month>31</date:month>
   <date:month>30</date:month>
   <date:month>31</date:month>
   <date:month>30</date:month>
   <date:month>31</date:month>
</date:month-lengths>
<func:function name="date:week-in-year">
   <xsl:param name="date-time">
      <xsl:choose>
         <xsl:when test="function-available('date:date-time')">
            <xsl:value-of select="date:date-time()" />
         </xsl:when>
         <xsl:otherwise>
            <xsl:value-of select="$date:date-time" />
         </xsl:otherwise>
      </xsl:choose>
   </xsl:param>
   <xsl:variable name="neg"
                 select="starts-with($date-time, '-')" />
   <xsl:variable name="dt-no-neg">
      <xsl:choose>
         <xsl:when test="$neg or starts-with($date-time, '+')">
            <xsl:value-of select="substring($date-time, 2)" />
         </xsl:when>
         <xsl:otherwise>
            <xsl:value-of select="$date-time" />
         </xsl:otherwise>
      </xsl:choose>
   </xsl:variable>
   <xsl:variable name="dt-no-neg-length"
                 select="string-length($dt-no-neg)" />
   <xsl:variable name="timezone">
      <xsl:choose>
         <xsl:when test="substring($dt-no-neg, $dt-no-neg-length) = 'Z'">Z</xsl:when>
         <xsl:otherwise>
            <xsl:variable name="tz"
                          select="substring($dt-no-neg, $dt-no-neg-length - 5)" />
            <xsl:if test="(substring($tz, 1, 1) = '-' or                             substring($tz, 1, 1) = '+') and                           substring($tz, 4, 1) = ':'">
               <xsl:value-of select="$tz" />
            </xsl:if>
         </xsl:otherwise>
      </xsl:choose>
   </xsl:variable>
   <xsl:variable name="week">
      <xsl:if test="not(string($timezone)) or                     $timezone = 'Z' or                      (substring($timezone, 2, 2) &lt;= 23 and                      substring($timezone, 5, 2) &lt;= 59)">
         <xsl:variable name="dt"
                       select="substring($dt-no-neg, 1, $dt-no-neg-length - string-length($timezone))" />
         <xsl:variable name="dt-length"
                       select="string-length($dt)" />
         <xsl:variable name="year"
                       select="substring($dt, 1, 4)" />
         <xsl:variable name="leap"
                       select="(not($year mod 4) and $year mod 100) or not($year mod 400)" />
         <xsl:variable name="month"
                       select="substring($dt, 6, 2)" />
         <xsl:variable name="day"
                       select="substring($dt, 9, 2)" />
         <xsl:if test="number($year) and                        substring($dt, 5, 1) = '-' and                        $month &lt;= 12 and                        substring($dt, 8, 1) = '-' and                        $day &lt;= 31 and                        ($dt-length = 10 or                         (substring($dt, 11, 1) = 'T' and                          substring($dt, 12, 2) &lt;= 23 and                          substring($dt, 14, 1) = ':' and                          substring($dt, 15, 2) &lt;= 59 and                          substring($dt, 17, 1) = ':' and                          substring($dt, 18) &lt;= 60))">
            <xsl:variable name="month-days"
                          select="sum(document('')/*/date:month-lengths/date:month[position() &lt; $month])" />
            <xsl:value-of select="date:_week-in-year($month-days + $day + ($leap and $month > 2), $year)" />
         </xsl:if>
      </xsl:if>
   </xsl:variable>
   <func:result select="number($week)" />
</func:function>
<func:function name="date:_week-in-year">
   <xsl:param name="days" />
   <xsl:param name="year" />
   <xsl:variable name="y-1"
                 select="$year - 1" />
<!--  this gives the day of the week, counting from Sunday = 0  -->
   <xsl:variable name="day-of-week"
                 select="($y-1 + floor($y-1 div 4) -                           floor($y-1 div 100) + floor($y-1 div 400) +                           $days)                           mod 7" />
<!--  this gives the day of the week, counting from Monday = 1  -->
   <xsl:variable name="dow">
      <xsl:choose>
         <xsl:when test="$day-of-week">
            <xsl:value-of select="$day-of-week" />
         </xsl:when>
         <xsl:otherwise>7</xsl:otherwise>
      </xsl:choose>
   </xsl:variable>
   <xsl:variable name="start-day"
                 select="($days - $dow + 7) mod 7" />
   <xsl:variable name="week-number"
                 select="floor(($days - $dow + 7) div 7)" />
   <xsl:choose>
      <xsl:when test="$start-day >= 4">
         <func:result select="$week-number + 1" />
      </xsl:when>
      <xsl:otherwise>
         <xsl:choose>
            <xsl:when test="not($week-number)">
               <func:result select="date:_week-in-year(365 + ((not($y-1 mod 4) and $y-1 mod 100) or not($y-1 mod 400)), $y-1)" />
            </xsl:when>
            <xsl:otherwise>
               <func:result select="$week-number" />
            </xsl:otherwise>
         </xsl:choose>
      </xsl:otherwise>
   </xsl:choose>
</func:function>

Change History

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