XSLT行计数器-有那么难吗?

XML文件中的行实际上与元素不同。在第一个示例中,您并不真正计算行数,而是计算元素的数量。

XML文件可能如下所示:

<cheeseCollection>
<cheese country="Cyprus">Gbejna</cheese><cheese>Liptauer</cheese><cheese>Anari</cheese>
</cheeseCollection>

或者完全相同的XML文件可以如下所示:

<cheeseCollection>
    <cheese
       country="Cyprus">Gbejna</cheese>
    <cheese>Liptauer</cheese>
    <cheese>Anari</cheese>
</cheeseCollection>

它的插入方式与XSLT完全相同-它不会真正影响换行。

因此,很难以您希望使用XSLT的方式显示行号——它并不是真正用于这种解析的。

如果我错了,有人会纠正我,但我会说你需要JavaScript或其他脚本语言来做你想做的。

虽然很难为XML文档的序列化标记行号(因为这种序列化本身是不明确的),但它是完全可能的,并且 easy ,对常规文本的行进行编号。

这种转变 :

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output method="text"/>

 <xsl:template match="/">
   <xsl:call-template name="numberLines"/>
 </xsl:template>

 <xsl:template name="numberLines">
  <xsl:param name="pLastLineNum" select="0"/>
  <xsl:param name="pText" select="."/>

  <xsl:if test="string-length($pText)">
   <xsl:value-of select="concat($pLastLineNum+1, ' ')"/>

   <xsl:value-of select="substring-before($pText, '&#xA;')"/>
   <xsl:text>&#xA;</xsl:text>

   <xsl:call-template name="numberLines">
    <xsl:with-param name="pLastLineNum"
      select="$pLastLineNum+1"/>
    <xsl:with-param name="pText"
      select="substring-after($pText, '&#xA;')"/>
   </xsl:call-template>
  </xsl:if>
 </xsl:template>
</xsl:stylesheet>

应用于此XML文档时 :

<t>The biggest airlines are imposing "peak travel surcharges"
this summer. In other words, they're going to raise fees
without admitting they're raising fees: Hey, it's not a $30
 price hike. It's a surcharge! This comes on the heels of
 checked-baggage fees, blanket fees, extra fees for window
 and aisle seats, and "snack packs" priced at exorbitant
 markups. Hotels in Las Vegas and elsewhere, meanwhile, are
 imposing "resort fees" for the use of facilities (in other
 words, raising room rates without admitting they're
 raising room rates). The chiseling dishonesty of these
 tactics rankles, and every one feels like another nail in
 the coffin of travel as something liberating and
 pleasurable.
</t>

生成所需的行编号 :

1 The biggest airlines are imposing "peak travel surcharges"
2 this summer. In other words, they're going to raise fees
3 without admitting they're raising fees: Hey, it's not a $30
4  price hike. It's a surcharge! This comes on the heels of
5  checked-baggage fees, blanket fees, extra fees for window
6  and aisle seats, and "snack packs" priced at exorbitant
7  markups. Hotels in Las Vegas and elsewhere, meanwhile, are
8  imposing "resort fees" for the use of facilities (in other
9  words, raising room rates without admitting they're
10  raising room rates). The chiseling dishonesty of these
11  tactics rankles, and every one feels like another nail in
12  the coffin of travel as something liberating and
13  pleasurable.

感谢大家的回答-是的,你完全正确,一些外部函数是在XSLT中获得这种行为的唯一方法。对于那些搜索,这是我在.NET 3.5中使用编译转换时所做的操作:

为函数创建助手类

/// <summary>
/// Provides functional support to XSLT
/// </summary>
public class XslHelper
{
    /// <summary>
    /// Initialise the line counter value to 1
    /// </summary>
    Int32 counter = 1;

    /// <summary>
    /// Increment and return the line count
    /// </summary>
    /// <returns></returns>
    public Int32 IncrementCount()
    {
        return counter++;
    }
}

将实例添加到用于XSLT的参数列表中

XslCompiledTransform xslt = new XslCompiledTransform();
xslt.Load(XmlReader.Create(s));
XsltArgumentList xslArg = new XsltArgumentList();
XslHelper helper = new XslHelper();
xslArg.AddExtensionObject("urn:helper", helper);
xslt.Transform(xd.CreateReader(), xslArg, writer);

在您的XSLT中使用它

将其放入样式表声明元素中:

 xmlns:helper="urn:helper"   

然后像这样使用:

<xsl:value-of select="helper:IncrementCount()" />

一般来说, position() 是指当前节点相对于当前正在处理的整批节点的数目。

使用“为每个嵌套”示例,当停止为每个构造嵌套并一次选择所有所需元素时,很容易实现连续编号。

使用此XML:

<a><b><c/><c/></b><b><c/></b></a>

像这样的循环构造

<xsl:for-each "a/b">
  <xsl:value-of select="position()" />
  <xsl:for-each "c">
    <xsl:value-of select="position()" />
  </xsl:for-each>
</xsl:for-each>

将导致

11221
bccbc  // referred-to nodes

但你可以简单地做到这一点:

<xsl:for-each "a/b/c">
  <xsl:value-of select="position()" />
</xsl:for-each>

你会得到

123
ccc    // referred-to nodes