如何在应用深度相等之前从序列中删除元素/属性

Question

这个问题是这里问题的延伸。 Honnen @Martin在这里提供的答案几乎完全是我想要的，尽管当调用 deep-equal 时，我错误地期望我想被以前的模板删除的元素/属性已经被删除（因此在传递给deep-equal的序列中不存在）。

如何从传递到deep-equal的序列中删除元素/属性，或以其他方式告诉deep-equal忽略某些元素/属性？

XSL：

<!--
    When a file is transformed using this stylesheet the output will be
    formatted as follows:
    1.)  Elements named "info" will be removed
    2.)  Attributes named "file_line_nr" or "file_name" will be removed
    3.)  Comments will be removed
    4.)  Processing instructions will be removed
    5.)  XML declaration will be removed
    6.)  Extra whitespace will be removed
    7.)  Empty attributes will be removed
    8.)  Elements which have no attributes, child elements, or text will be removed
    9.)  Duplicate sibling elements will be removed
    10.) All elements will be sorted by name recursively
    11.) All attributes will be sorted by name
-->
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <!-- Set output options -->
    <xsl:output indent="yes" method="xml" omit-xml-declaration="yes"/>
    <xsl:strip-space elements="*"/>
    <!-- Match any attribute -->
    <xsl:template match="@*">
        <xsl:copy/>
    </xsl:template>
    <!-- Match any element -->
    <xsl:template match="*">
        <xsl:copy>
          <xsl:apply-templates select="@*">
            <xsl:sort select="local-name()"/>
           </xsl:apply-templates>
           <xsl:for-each-group select="node() except (processing-instruction(), comment())" group-adjacent="boolean(self::*)">
             <xsl:choose>
               <xsl:when test="current-grouping-key()">
                 <xsl:apply-templates select="current-group()">
                   <xsl:sort select="local-name()"/>
                 </xsl:apply-templates>
               </xsl:when>
               <xsl:otherwise>
                 <xsl:apply-templates select="current-group()"/>
               </xsl:otherwise>
             </xsl:choose>
           </xsl:for-each-group>
        </xsl:copy>
    </xsl:template>
    <!-- Elements/attributes to ignore -->
    <xsl:template match="@*[normalize-space()='']|info|@file_line_nr|@file_name|*[not(@*|node())]"/>
    <!-- Ignore element nodes which are deep-equal to a preceding sibling element -->
    <xsl:template match="*[some $ps in preceding-sibling::* satisfies deep-equal(., $ps)]"/>
</xsl:stylesheet>

XML 输入：

<root>
    <!-- foo #1 -->
    <foo a="a" file_line_nr="1"/>
    <!-- bar #1 -->
    <bar>
    some text
        <info a="a"/>
    </bar>
    <!-- foo #2 -->
    <foo a="a" file_line_nr="2"/><!-- This should be removed because it is identical to the foo #1 except for the "file_line_nr" attribute which should be removed/ignored -->
    <!-- baz #1 -->
    <baz file_name="some_file.h">
        <bam a="a"/>
    </baz>
    <!-- bar #2 -->
    <bar><!-- This should be removed because it is identical to the bar #1 except for the "info" child element which should be removed/ignored -->
        some text
        <info b="b"/>
    </bar>
    <!-- baz #2 -->
    <baz file_name="some_other_file.h"><!-- This should be removed because it is identical to the baz #1 except for the "file_name" attribute which should be removed/ignored -->
        <bam a="a"/>
    </baz>
</root>

期望输出：

<root>
    <foo a="a"/>
    <bar>
    some text
    </bar>
    <baz>
        <bam a="a"/>
    </baz>
</root>

Answer 1

您的模板都与原始 XML 树中的节点匹配，而不是与具有输出的节点匹配。 您必须将处理分为两个阶段，首先将所有不需要的元素、属性等剥离到一个变量中，然后对该变量进行深度相等过滤器。 像这样：

<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <!-- Set output options -->
    <xsl:output indent="yes" method="xml" omit-xml-declaration="yes"/>
    <xsl:strip-space elements="*"/>
    <xsl:template match="/">
      <!-- first pass with default-mode templates -->
      <xsl:variable name="pass1">
        <xsl:apply-templates />
      </xsl:variable>
      <!-- second pass with dedup templates -->
      <xsl:apply-templates select="$pass1" mode="dedup" />
    </xsl:template>
    <!-- pre-processing templates -->
    <!-- Match any attribute -->
    <xsl:template match="@*">
        <xsl:copy/>
    </xsl:template>
    <!-- Match any element -->
    <xsl:template match="*">
        <xsl:copy>
          <xsl:apply-templates select="@*">
            <xsl:sort select="local-name()"/>
           </xsl:apply-templates>
           <xsl:for-each-group select="node() except (processing-instruction(), comment())" group-adjacent="boolean(self::*)">
             <xsl:choose>
               <xsl:when test="current-grouping-key()">
                 <xsl:apply-templates select="current-group()">
                   <xsl:sort select="local-name()"/>
                 </xsl:apply-templates>
               </xsl:when>
               <xsl:otherwise>
                 <xsl:apply-templates select="current-group()"/>
               </xsl:otherwise>
             </xsl:choose>
           </xsl:for-each-group>
        </xsl:copy>
    </xsl:template>
    <!-- Elements/attributes to ignore -->
    <xsl:template match="@*[normalize-space()='']|info|@file_line_nr|@file_name|*[not(@*|node())]"/>

    <!-- de-duplication templates -->
    <!-- Ignore element nodes which are deep-equal to a preceding sibling element -->
    <xsl:template mode="dedup" match="*[some $ps in preceding-sibling::* satisfies deep-equal(., $ps)]"/>
    <xsl:template mode="dedup" match="@*|node()">
      <xsl:copy><xsl:apply-templates mode="dedup" select="@*|node()"/></xsl:copy>
    </xsl:template>
</xsl:stylesheet>