xslt - 我如何使用 XSLT 1.0 来正确调整纯文本输出？

Question

我正在处理一个如下所示的 XML 文件:

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="align-test.xsl"?>
<alignTest>
    <item name="Some Name" number="3"></item>
    <item name="Another Name" number="10"></item>
    <item name="A Third One" number="43"></item>
    <item name="A Really Long Name" number="100"></item>
</alignTest>

我的目标是输出一个纯文本文件，其中包含一个格式良好的表格。我已经弄清楚如何使用此样式表对齐和填充文本列和分隔符:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
    <xsl:output method="text"/>
    <xsl:template match="/">

        <xsl:for-each select="alignTest/item">
            <!-- Scroll right. The next line keeps going, but might not look like it due to formatting -->
            <xsl:value-of select="substring(concat(@name, '                         '), 1, 22)"/>
            <xsl:text> | </xsl:text>
            <xsl:value-of select="@number"/>
            <xsl:text>&#10;</xsl:text>
        </xsl:for-each>

    </xsl:template>
</xsl:stylesheet>

哪些输出:

Some Name              | 3
Another Name           | 10
A Third One            | 43
A Really Long Name     | 100

我还希望数值右对齐。像这样:

Some Name              |   3
Another Name           |  10
A Third One            |  43
A Really Long Name     | 100

我如何使用 XSLT 1.0 以这种方式右对齐纯文本？

Answer 1

这是一个更易读、更有效的答案版本:

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

 <xsl:template match="item">
        <xsl:call-template name="padRightSide">
            <xsl:with-param name="stringToPad" select="@name"/>
            <xsl:with-param name="totalLength" select="22"/>
        </xsl:call-template>

        <xsl:text>|</xsl:text>

        <xsl:call-template name="padLeftSide">
            <xsl:with-param name="stringToPad" select="@number"/>
            <xsl:with-param name="totalLength" select="5"/>
        </xsl:call-template>

        <xsl:text>&#10;</xsl:text>
 </xsl:template>

 <!-- template to pad the left side of strings (and right justificy) -->
 <xsl:template name="padLeftSide">
    <xsl:param name="stringToPad"/>
    <xsl:param name="totalLength"/>
    <xsl:param name="padChar" select="' '"/>
    <xsl:param name="padBuffer" select=
    "concat($padChar,$padChar,$padChar,$padChar,$padChar,
            $padChar,$padChar,$padChar,$padChar,$padChar
            )"/>
    <xsl:variable name="vNewString" select=
                       "concat($padBuffer, $stringToPad)"/>

    <xsl:choose>
        <xsl:when test="not(string-length($vNewString) >= $totalLength)">
            <xsl:call-template name="padLeftSide">
                <xsl:with-param name="stringToPad" select="$vNewString"/>
                <xsl:with-param name="totalLength" select="$totalLength"/>
                <xsl:with-param name="padChar" select="$padChar"/>
                <xsl:with-param name="padBuffer" select="$padBuffer"/>
            </xsl:call-template>
        </xsl:when>
        <xsl:otherwise>
            <xsl:value-of select=
            "substring($vNewString, 
                       string-length($vNewString) - $totalLength + 1)"/>
        </xsl:otherwise>
    </xsl:choose>
 </xsl:template>

 <!-- template to pad the right side of strings -->
 <xsl:template name="padRightSide">
    <xsl:param name="totalLength"/>
    <xsl:param name="padChar" select="' '"/>
    <xsl:param name="stringToPad"/>
    <xsl:param name="padBuffer" select=
    "concat($padChar,$padChar,$padChar,$padChar,$padChar,
            $padChar,$padChar,$padChar,$padChar,$padChar
            )"/>
    <xsl:variable name="vNewString" select=
                       "concat($stringToPad, $padBuffer)"/>
    <xsl:choose>
        <xsl:when test="not(string-length($vNewString) >= $totalLength)">
            <xsl:call-template name="padRightSide">
                <xsl:with-param name="stringToPad" select="$vNewString"/>
                <xsl:with-param name="totalLength" select="$totalLength"/>
                <xsl:with-param name="padChar" select="$padChar"/>
                <xsl:with-param name="padBuffer" select="$padBuffer"/>
            </xsl:call-template>
        </xsl:when>
        <xsl:otherwise>
            <xsl:value-of select="substring($vNewString,1,$totalLength)"/>
        </xsl:otherwise>
    </xsl:choose>
 </xsl:template>
</xsl:stylesheet>

另一个改进是动态计算最大字符串长度，而不必手动计算:

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

 <xsl:variable name="vNamesMaxLen">
  <xsl:call-template name="maxLength">
   <xsl:with-param name="pNodes"
                   select="/*/item/@name"/>
  </xsl:call-template>
 </xsl:variable>


 <xsl:variable name="vNumsMaxLen">
  <xsl:call-template name="maxLength">
   <xsl:with-param name="pNodes"
                   select="/*/item/@number"/>
  </xsl:call-template>
 </xsl:variable>

 <xsl:template match="item">
        <xsl:call-template name="padRightSide">
            <xsl:with-param name="stringToPad"
                            select="@name"/>
            <xsl:with-param name="totalLength"
                            select="$vNamesMaxLen+1"/>
        </xsl:call-template>

        <xsl:text>|</xsl:text>

        <xsl:call-template name="padLeftSide">
            <xsl:with-param name="stringToPad"
                            select="@number"/>
            <xsl:with-param name="totalLength"
                            select="$vNumsMaxLen+1"/>
        </xsl:call-template>

        <xsl:text>&#10;</xsl:text>
 </xsl:template>

 <xsl:template name="maxLength">
  <xsl:param name="pNodes" select="/.."/>

  <xsl:for-each select="$pNodes">
   <xsl:sort select="string-length()" data-type="number"
             order="descending"/>
    <xsl:if test="position() = 1">
     <xsl:value-of select="string-length()"/>
    </xsl:if>
  </xsl:for-each>
 </xsl:template>

 <!-- template to pad the left side of strings (and right justificy) -->
 <xsl:template name="padLeftSide">
    <xsl:param name="stringToPad"/>
    <xsl:param name="totalLength"/>
    <xsl:param name="padChar" select="' '"/>
    <xsl:param name="padBuffer" select=
    "concat($padChar,$padChar,$padChar,$padChar,$padChar,
            $padChar,$padChar,$padChar,$padChar,$padChar
            )"/>
    <xsl:variable name="vNewString" select=
                    "concat($padBuffer, $stringToPad)"/>

    <xsl:choose>
        <xsl:when test="not(string-length($vNewString) >= $totalLength)">
            <xsl:call-template name="padLeftSide">
                <xsl:with-param name="stringToPad" select="$vNewString"/>
                <xsl:with-param name="totalLength" select="$totalLength"/>
                <xsl:with-param name="padChar" select="$padChar"/>
                <xsl:with-param name="padBuffer" select="$padBuffer"/>
            </xsl:call-template>
        </xsl:when>
        <xsl:otherwise>
            <xsl:value-of select=
            "substring($vNewString, 
                       string-length($vNewString) - $totalLength + 1)"/>
        </xsl:otherwise>
    </xsl:choose>
 </xsl:template>

 <!-- template to pad the right side of strings -->
 <xsl:template name="padRightSide">
    <xsl:param name="totalLength"/>
    <xsl:param name="padChar" select="' '"/>
    <xsl:param name="stringToPad"/>
    <xsl:param name="padBuffer" select=
    "concat($padChar,$padChar,$padChar,$padChar,$padChar,
            $padChar,$padChar,$padChar,$padChar,$padChar
            )"/>
    <xsl:variable name="vNewString" select=
                    "concat($stringToPad, $padBuffer)"/>
    <xsl:choose>
        <xsl:when test="not(string-length($vNewString) >= $totalLength)">
            <xsl:call-template name="padRightSide">
                <xsl:with-param name="stringToPad" select="$vNewString"/>
                <xsl:with-param name="totalLength" select="$totalLength"/>
                <xsl:with-param name="padChar" select="$padChar"/>
                <xsl:with-param name="padBuffer" select="$padBuffer"/>
            </xsl:call-template>
        </xsl:when>
        <xsl:otherwise>
            <xsl:value-of select="substring($vNewString,1,$totalLength)"/>
        </xsl:otherwise>
    </xsl:choose>
 </xsl:template>
</xsl:stylesheet>