如何防止字在XSLT中被截斷

Question

我有一個巨大的字符串進入XSLT（1.0），我必須將這個字符串分成一定數量的字符串（這是一個靜態數字），並且具有一定的長度（這是一個靜態數字），但我不應該讓字被切斷。例如：我有以下字符串

這是爲了在打印應用程序PDF時測試單詞縮減產品。

String1中長度爲35應該是： 這是測試這個詞切

String2的35應該是： 產品在打印

STRING3其餘所有： 應用PDF。

另請參考XSLT2.0中的如何操作。

Answer 1

下面是一個簡單的解決方案，使用str-split-to-lines模板從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> 

當這種轉換應用於以下XML文檔：

<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> 

通緝，正確的結果（文本被分割成不超過64個字符的行，並且沒有單詞被分割吐溫兩條線）產生：

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. 

請注意：

的轉換通常會導入包含str-split-to-lines XSLT文件，所以代碼會短得多。

爲了完整起見，這裏是唯一的進口XSLT樣式表：

<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>