递归:将复杂的条件和排序结合起来

Recursion: integrating complex condition and order by rank

现有的 XSLT 代码需要根据以下条件进行增强。

1 - 与递归算法一起添加检查每个比较行(元素)是否具有:

2 - 排名顺序。所有恢复(或恢复)的链最终都必须按 'rank' 属性排序 (它可能与本机递归匹配,但有时不匹配。无论如何 'rank' 属性具有更高的优先级。 Rank 没有固定的命名法(如 1-2-3-4),但它的链可以通过比较 'more'-'less' 来计算。 (1 < 3 < 7)。

源代码

<A>
  <X id="top"                         text="first"  text2="*"     status="0" rank="1"/>
  <X id="middle"  id-parent="top"     text="second" text2="**"    status="0" rank="3"/>
  <X id="bottom"  id-parent="middle"  text="third"  text2="***"   status="0" rank="6"/>

  <X id="bottom2" id-parent="middle"  text="fourth" text2="****"  status="0" rank="2"/> <!--note rank! bottom and middle should be switching because "bottom2 has a "higher" rank-->
  <X id="bottom3" id-parent="middle"  text="fifth"  text2="*****" status="2" rank="6" status2="any-value-make-its-status-not_null"/>
</A>

XSLT 转换

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

    <xsl:template match="@* | node()">
        <xsl:copy>
            <xsl:apply-templates select="@* | node()"/>
        </xsl:copy>
    </xsl:template>

    <xsl:key name="ref" match="X" use="@id"/>

    <xsl:template match="X">
        <xsl:copy>
            <xsl:copy-of select="@*"/>
            <xsl:variable name="Xs">
            <xsl:call-template name="XATT">
                <xsl:with-param name="currentX" select="."/>
                <xsl:with-param name="X" select=".">
                </xsl:with-param>
            </xsl:call-template>
            </xsl:variable>
            <xsl:if test="$Xs[node()]">
                <xsl:attribute name="chain-text">
                    <xsl:for-each select="$Xs/X">
                        <xsl:if test="position() ne 1"><xsl:text> | </xsl:text></xsl:if>
                        <xsl:value-of select="concat(@text, ' ', @text2)"/>
                    </xsl:for-each>
                </xsl:attribute>
                <xsl:for-each select="$Xs/X">
                    <xsl:attribute name="level-{position()}"><xsl:value-of select="concat(@text, ' | ', @text2)"/></xsl:attribute>
                </xsl:for-each>
            </xsl:if>

        </xsl:copy>
    </xsl:template>

    <xsl:template name="XATT">
        <xsl:param name="currentX"/>
        <xsl:param name="X"/>
        <xsl:choose>
            <xsl:when test="$currentX/@id-parent">
                <xsl:call-template name="XATT">
                    <xsl:with-param name="currentX" select="key('ref', $currentX/@id-parent)"/>
                    <xsl:with-param name="X">
                        <xsl:copy-of select="key('ref', $currentX/@id-parent)"/>
                        <xsl:copy-of select="$X"/>
                    </xsl:with-param>
                </xsl:call-template>
            </xsl:when>
            <xsl:otherwise>
                <xsl:copy-of select="$X"/>
            </xsl:otherwise>
        </xsl:choose>

    </xsl:template>

</xsl:stylesheet>

https://xsltfiddle.liberty-development.net/94AcskR

互联scheme

期望输出

<?xml version="1.0" encoding="UTF-8"?><A>
  <X id="top" text="first" text2="*" chain-text="first *" level-1="first | *"/>
  <X id="middle" id-parent="top" text="second" text2="**" chain-text="first * | second **" level-1="first | *" level-2="second | **"/>
  <X id="bottom" id-parent="middle" text="third" text2="***" chain-text="first * | second ** | third ***" level-1="first | *" level-2="second | **" level-3="third | ***"/>

  <!--new conditions are clearly visible on the following lines-->
  <X id="bottom2" id-parent="middle"  text="fourth" text2="****" chain-text="first * | fourth **** | second **" level-1="first | *" level-2="fourth | ****" level-3="second | **"/> <!-- bottom and middle are switching because of 'rank' -->
  <X id="bottom3" id-parent="middle"  text="fifth"  text2="*****" status="1" rank="6" status2="any-value-here-make-its-status-not_null"/> <!--nothing happens with this line because of 'status' and 'status2' attributes  -->
</A>

你的措辞掩盖了问题。您需要折叠层次结构(用 @id@id-parent 属性表示),然后按 @rank 属性对路径进行排序。

此 XSLT 1.0 样式表(带有 EXSLT 扩展名):

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
    xmlns:exslt="http://exslt.org/common">
    <xsl:key name="X-By-id" match="X" use="@id"/>
    <xsl:key name="X-By-parent-id" match="X" use="string(@id-parent)"/>

    <xsl:variable name="fold-rtf">
        <xsl:apply-templates select="/" mode="fold"/>
    </xsl:variable>
    <xsl:variable name="folded-tree" select="exslt:node-set($fold-rtf)"/>

    <xsl:template match="@*|node()">
        <xsl:copy>
            <xsl:apply-templates select="@* | node()"/>
        </xsl:copy>
    </xsl:template>

    <xsl:template match="X[@status=0][not(@status2)]/@*[last()]">
        <xsl:variable name="current" select=".."/>
        <xsl:copy/>
        <xsl:for-each select="$folded-tree">
            <xsl:for-each select="key('X-By-id',$current/@id)">
                <xsl:attribute name="chain-text">
                    <xsl:for-each select="ancestor-or-self::*">
                        <xsl:sort select="@rank"/>
                        <xsl:if test="position()!=1"> | </xsl:if>
                        <xsl:value-of select="concat(@text,' ',@text2)"/>
                    </xsl:for-each>                
                </xsl:attribute>
                <xsl:for-each select="ancestor-or-self::*">
                    <xsl:sort select="@rank"/>
                    <xsl:attribute name="level-{position()}">
                        <xsl:value-of select="concat(@text,' | ',@text2)"/>
                    </xsl:attribute>
                </xsl:for-each>                
            </xsl:for-each>            
        </xsl:for-each>
    </xsl:template>

    <xsl:template match="/|*" mode="fold">
        <xsl:copy>
            <xsl:copy-of select="@*"/>
            <xsl:apply-templates select="key('X-By-parent-id',string(@id))" mode="fold">
            </xsl:apply-templates>
        </xsl:copy>
    </xsl:template>
</xsl:stylesheet>

输出:

<A>
  <X id="top" text="first" text2="*" status="0" rank="1" 
     chain-text="first *" level-1="first | *" />
  <X id="middle" id-parent="top" text="second" text2="**" status="0" rank="3" 
     chain-text="first * | second **" level-1="first | *" level-2="second | **" />
  <X id="bottom" id-parent="middle" text="third" text2="***" status="0" rank="6" 
     chain-text="first * | second ** | third ***" level-1="first | *" level-2="second | **" level-3="third | ***" />

  <X id="bottom2" id-parent="middle" text="fourth" text2="****" status="0" rank="2" 
     chain-text="first * | fourth **** | second **" level-1="first | *" level-2="fourth | ****" level-3="second | **" /> <!--note rank! bottom and middle should be switching because "bottom2 has a "higher" rank-->
  <X id="bottom3" id-parent="middle" text="fifth" text2="*****" status="2" rank="6" status2="any-value-make-its-status-not_null" />
</A>

请注意: 使用 node-set() 函数进行两步转换,使用 key() 函数对另一个输入文档进行上下文更改,强制对键进行字符串转换,因为有关于节点集作为键的特殊规则,也因为我想使用空字符串键...

建议:所有这些都可以翻译成几行XSLT 2.0+