如何防止字在XSLT中被截断

Question

我有一个巨大的字符串进入XSLT（1.0），我必须将这个字符串分成一定数量的字符串（这是一个静态数字），并且具有一定的长度（这是一个静态数字），但我不应该让字被切断。例如：我有以下字符串

这是为了在打印应用程序PDF时测试单词缩减产品。

String1中长度为35应该是： 这是测试这个词切

String2的35应该是： 产品在打印

STRING3其余所有： 应用PDF。

另请参考XSLT2.0中的如何操作。

Answer 1

下面是一个简单的解决方案，使用str-split-to-lines模板从FXSL library：

<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
xmlns:f="http://fxsl.sf.net/" 
xmlns:ext="http://exslt.org/common" 
xmlns:str-split2lines-func="f:str-split2lines-func" 
exclude-result-prefixes="xsl f ext str-split2lines-func" 
> 


    <xsl:import href="dvc-str-foldl.xsl"/> 

    <!-- to be applied on text.xml --> 

    <str-split2lines-func:str-split2lines-func/> 

    <xsl:output indent="yes" omit-xml-declaration="yes"/> 

    <xsl:template match="/"> 
     <xsl:call-template name="str-split-to-lines"> 
     <xsl:with-param name="pStr" select="/*"/> 
     <xsl:with-param name="pLineLength" select="64"/> 
     <xsl:with-param name="pDelimiters" select="' &#9;&#10;&#13;'"/> 
     </xsl:call-template> 
    </xsl:template> 

    <xsl:template name="str-split-to-lines"> 
     <xsl:param name="pStr"/> 
     <xsl:param name="pLineLength" select="60"/> 
     <xsl:param name="pDelimiters" select="' &#9;&#10;&#13;'"/> 

     <xsl:variable name="vsplit2linesFun" 
        select="document('')/*/str-split2lines-func:*[1]"/> 

     <xsl:variable name="vrtfParams"> 
     <delimiters><xsl:value-of select="$pDelimiters"/></delimiters> 
     <lineLength><xsl:copy-of select="$pLineLength"/></lineLength> 
     </xsl:variable> 

     <xsl:variable name="vResult"> 
      <xsl:call-template name="dvc-str-foldl"> 
      <xsl:with-param name="pFunc" select="$vsplit2linesFun"/> 
      <xsl:with-param name="pStr" select="$pStr"/> 
      <xsl:with-param name="pA0" select="ext:node-set($vrtfParams)"/> 
      </xsl:call-template> 
     </xsl:variable> 

     <xsl:for-each select="ext:node-set($vResult)/line"> 
     <xsl:for-each select="word"> 
      <xsl:value-of select="concat(., ' ')"/> 
     </xsl:for-each> 
     <xsl:value-of select="'&#xA;'"/> 
     </xsl:for-each> 
    </xsl:template> 

    <xsl:template match="str-split2lines-func:*" mode="f:FXSL"> 
     <xsl:param name="arg1" select="/.."/> 
     <xsl:param name="arg2"/> 

     <xsl:copy-of select="$arg1/*[position() &lt; 3]"/> 
     <xsl:copy-of select="$arg1/line[position() != last()]"/> 

     <xsl:choose> 
     <xsl:when test="contains($arg1/*[1], $arg2)"> 
      <xsl:if test="string($arg1/word)"> 
      <xsl:call-template name="fillLine"> 
       <xsl:with-param name="pLine" select="$arg1/line[last()]"/> 
       <xsl:with-param name="pWord" select="$arg1/word"/> 
       <xsl:with-param name="pLineLength" select="$arg1/*[2]"/> 
      </xsl:call-template> 
      </xsl:if> 
     </xsl:when> 
     <xsl:otherwise> 
      <xsl:copy-of select="$arg1/line[last()]"/> 
      <word><xsl:value-of select="concat($arg1/word, $arg2)"/></word> 
     </xsl:otherwise> 
     </xsl:choose> 
    </xsl:template> 

     <!-- Test if the new word fits into the last line --> 
    <xsl:template name="fillLine"> 
     <xsl:param name="pLine" select="/.."/> 
     <xsl:param name="pWord" select="/.."/> 
     <xsl:param name="pLineLength" /> 

     <xsl:variable name="vnWordsInLine" select="count($pLine/word)"/> 
     <xsl:variable name="vLineLength" 
     select="string-length($pLine) + $vnWordsInLine"/> 
     <xsl:choose> 
     <xsl:when test="not($vLineLength + string-length($pWord) 
          > 
          $pLineLength)"> 
      <line> 
      <xsl:copy-of select="$pLine/*"/> 
      <xsl:copy-of select="$pWord"/> 
      </line> 
     </xsl:when> 
     <xsl:otherwise> 
      <xsl:copy-of select="$pLine"/> 
      <line> 
      <xsl:copy-of select="$pWord"/> 
      </line> 
      <word/> 
     </xsl:otherwise> 
     </xsl:choose> 
    </xsl:template> 
</xsl:stylesheet> 

当这种转换应用于以下XML文档：

<text> 
Dec. 13 — As always for a presidential inaugural, security and surveillance were 
extremely tight in Washington, DC, last January. But as George W. Bush prepared to 
take the oath of office, security planners installed an extra layer of protection: a 
prototype software system to detect a biological attack. The U.S. Department of 
Defense, together with regional health and emergency-planning agencies, distributed 
a special patient-query sheet to military clinics, civilian hospitals and even aid 
stations along the parade route and at the inaugural balls. Software quickly 
analyzed complaints of seven key symptoms — from rashes to sore throats — for 
patterns that might indicate the early stages of a bio-attack. There was a brief 
scare: the system noticed a surge in flulike symptoms at military clinics. 
Thankfully, tests confirmed it was just that — the flu. 
</text> 

通缉，正确的结果（文本被分割成不超过64个字符的行，并且没有单词被分割吐温两条线）产生：

Dec. 13 — As always for a presidential inaugural, security and 
surveillance were extremely tight in Washington, DC, last 
January. But as George W. Bush prepared to take the oath of 
office, security planners installed an extra layer of 
protection: a prototype software system to detect a biological 
attack. The U.S. Department of Defense, together with regional 
health and emergency-planning agencies, distributed a special 
patient-query sheet to military clinics, civilian hospitals and 
even aid stations along the parade route and at the inaugural 
balls. Software quickly analyzed complaints of seven key 
symptoms — from rashes to sore throats — for patterns that might 
indicate the early stages of a bio-attack. There was a brief 
scare: the system noticed a surge in flulike symptoms at 
military clinics. Thankfully, tests confirmed it was just that — 
the flu. 

请注意：

的转换通常会导入包含str-split-to-lines XSLT文件，所以代码会短得多。

为了完整起见，这里是唯一的进口XSLT样式表：

<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
xmlns:f="http://fxsl.sf.net/" 
xmlns:ext="http://exslt.org/common" 
> 
    <xsl:template name="dvc-str-foldl"> 
     <xsl:param name="pFunc" select="/.."/> 
     <xsl:param name="pA0"/> 
     <xsl:param name="pStr"/> 

     <xsl:choose> 
     <xsl:when test="not($pStr)"> 
      <xsl:copy-of select="$pA0"/> 
     </xsl:when> 
     <xsl:otherwise> 
      <xsl:variable name="vcntList" select="string-length($pStr)"/> 
      <xsl:choose> 
       <xsl:when test="$vcntList = 1"> 
        <xsl:apply-templates select="$pFunc[1]" mode="f:FXSL"> 
        <xsl:with-param name="arg0" 
             select="$pFunc[position() > 1]"/> 
        <xsl:with-param name="arg1" select="$pA0"/> 
        <xsl:with-param name="arg2" 
              select="substring($pStr,1,1)"/> 
        </xsl:apply-templates> 
       </xsl:when> 
       <xsl:otherwise> 
       <xsl:variable name="vHalfLen" 
           select="floor($vcntList div 2)"/> 
       <xsl:variable name="vFunResult1"> 
        <xsl:call-template name="dvc-str-foldl"> 
        <xsl:with-param name="pFunc" select="$pFunc"/> 
        <xsl:with-param name="pA0" select="$pA0"/> 
        <xsl:with-param name="pStr" 
        select="substring($pStr, 
             1, 
             $vHalfLen 
             )"/> 
        </xsl:call-template> 
       </xsl:variable> 

       <xsl:call-template name="dvc-str-foldl"> 
         <xsl:with-param name="pFunc" select="$pFunc"/> 
         <xsl:with-param name="pStr" 
            select="substring($pStr,$vHalfLen+1)" 
            /> 
         <xsl:with-param name="pA0" 
           select="ext:node-set($vFunResult1)"/> 

       </xsl:call-template> 
       </xsl:otherwise> 
      </xsl:choose> 
     </xsl:otherwise> 
     </xsl:choose> 
    </xsl:template> 
</xsl:stylesheet>