This file is indexed.

/usr/share/checkstyle/xsl/checkstyle-author.xsl is in checkstyle 5.4-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
    <xsl:output method="html" indent="yes"/>
    <xsl:decimal-format decimal-separator="." grouping-separator=","/>
    <!-- 
    Checkstyle XML Style Sheet by Daniel Grenner 
    <daniel DOT grenner AT enea DOT se> 
    This stylesheet groups the errors by author name, if used  in combination
    with the WriteTag check:

        <module name="WriteTag">
            <property name="tag" value="@author"/>
            <property name="tagFormat" value="\S"/>
            <property name="severity" value="ignore"/>
        </module>

    The output contains both error and warning messages.
    Files without errors or warnings are not included.
    This stylesheet is based on checkstyle-noframes.xsl.
    -->

    <xsl:key name="keyAuthorID" match="//file/error[contains(@message,'@author')]" use="@message" />
    <xsl:key name="keySeverityID" match="//file/error" use="@severity" />
    <xsl:template match="checkstyle">
        <html>
            <head>
                <style type="text/css">
    .bannercell {
      border: 0px;
      padding: 0px;
    }
    body {
      margin-left: 10;
      margin-right: 10;
      font:normal 68% verdana,arial,helvetica;
      background-color:#FFFFFF;
      color:#000000;
    }
    .a td {
      background: #efefef;
    }
    .b td {
      background: #fff;
    }
    th, td {
      text-align: left;
      vertical-align: top;
    }
    th {
      font-weight:bold;
      background: #ccc;
      color: black;
    }
    table, th, td {
      font-size:100%;
      border: none
    }
    table.log tr td, tr th {

    }
    h2 {
      font-weight:bold;
      font-size:140%;
      margin-bottom: 5;
    }
    h3 {
      font-size:100%;
      font-weight:bold;
      background: #525D76;
      color: white;
      text-decoration: none;
      padding: 5px;
      margin-right: 2px;
      margin-left: 2px;
      margin-bottom: 0;
    }
        </style>
            </head>
            <body>
                <a name="#top"/>
                <!-- jakarta logo -->
                <table border="0" cellpadding="0" cellspacing="0" width="100%">
                    <tr>
                        <td class="bannercell" rowspan="2">
                            <!--a href="http://jakarta.apache.org/">
          <img src="http://jakarta.apache.org/images/jakarta-logo.gif" alt="http://jakarta.apache.org" align="left" border="0"/>
          </a-->
                        </td>
                        <td class="text-align:right">
                            <h2>CheckStyle Audit</h2>
                        </td>
                    </tr>
                    <tr>
                        <td class="text-align:right">Designed for use with <a href="http://checkstyle.sourceforge.net/">CheckStyle</a> and <a href="http://jakarta.apache.org">Ant</a>.</td>
                    </tr>
                </table>
                <hr size="1"/>

                <!-- Summary part -->
                <xsl:apply-templates select="." mode="summary"/>
                <hr size="1" width="100%" align="left"/>

                <!-- Author List part -->
                <xsl:apply-templates select="." mode="authorlist"/>
                <hr size="1" width="100%" align="left"/>

                <!-- For each package create its part -->
                <xsl:for-each select="file">
                    <xsl:sort select="./error[contains(@message,'@author=')]/@message"/>
                    <xsl:apply-templates select="."/>
                    <p/>
                    <p/>
                </xsl:for-each>
                <hr size="1" width="100%" align="left"/>
            </body>
        </html>
    </xsl:template>
    <xsl:template match="checkstyle" mode="summary">
        <h3>Summary</h3>
        <xsl:variable name="fileCount" select="count(file)"/>
        <xsl:variable name="errorCount" select="count(key('keySeverityID', 'error'))"/>
        <xsl:variable name="warningCount" select="count(key('keySeverityID', 'warning'))"/>
        <table class="log" border="0" cellpadding="5" cellspacing="2" width="100%">
            <tr>
                <th>Files</th>
                <th>Errors</th>
                <th>Warnings</th>
            </tr>
            <tr>
                <xsl:call-template name="alternated-row"/>
                <td>
                    <xsl:value-of select="$fileCount"/>
                </td>
                <td>
                    <xsl:value-of select="$errorCount"/>
                </td>
                <td>
                    <xsl:value-of select="$warningCount"/>
                </td>
            </tr>
        </table>
    </xsl:template>
    <xsl:template match="checkstyle" mode="authorlist">
        <h3>Authors</h3>

        <table class="log" border="0" cellpadding="5" cellspacing="2" width="100%">
            <tr>
                <th>Name</th>
                <th>Errors</th>
                <th>Warnings</th>
            </tr>

        <!-- Process each Author -->
        <xsl:for-each select="file/error[generate-id(.) = generate-id(key('keyAuthorID', @message)[1])]">
            <xsl:sort select="@message" />

                <xsl:variable name="authorFull" select="@message"/>
                <xsl:variable name="author" select="substring-after($authorFull,'@author=')"/>
                <xsl:variable name="errors" select="count(key('keyAuthorID', @message)/../error[@severity='error'])"/>
                <xsl:variable name="warnings" select="count(key('keyAuthorID', @message)/../error[@severity='warning'])"/>
                <xsl:if test = "not ($author='' or ($errors + $warnings = 0))">
                    <tr>
                    <xsl:call-template name="alternated-row"/>
                    <td>
                        <a href="#{$author}">
                            <xsl:value-of select="$author"/>
                        </a>
                    </td>
                        <td><xsl:value-of select="$errors"/></td>
                        <td><xsl:value-of select="$warnings"/></td>
                    </tr>
                </xsl:if>
        </xsl:for-each>

    </table>
    </xsl:template>

    <xsl:template match="file">
        <xsl:variable name="errorCount" select="count(error[@severity='error']) + count(error[@severity='warning'])"/>
        <xsl:if test="not ($errorCount=0)">

            <xsl:variable name="author" select="substring-after(./error[contains(@message,'@author')]/@message,'@author=')"/>

            <a name="#{$author}"/>
            <h3>File <xsl:value-of select="@name"/>
                <br/>
            Author <xsl:value-of select="$author"/>
            </h3>
            <table class="log" border="0" cellpadding="5" cellspacing="2" width="100%">
                <tr>
                    <th>Error Description</th>
                    <th>Line</th>
                </tr>
                <xsl:for-each select="error[not(@severity='info')]">
                <xsl:sort select="@line" data-type="number"/>
                    <tr>
                        <xsl:call-template name="alternated-row"/>
                        <td>
                            <xsl:value-of select="@message"/>
                        </td>
                        <td>
                            <xsl:value-of select="@line"/>
                        </td>
                    </tr>
                </xsl:for-each>
            </table>
            <a href="#top">Back to top</a>
        </xsl:if>
    </xsl:template>


<xsl:template name="basename">
  <xsl:param name="path"/>
  <xsl:choose>
     <xsl:when test="contains($path, '\')">
        <xsl:call-template name="basename">
           <xsl:with-param name="path">substring-after($path, '\')</xsl:with-param>
        </xsl:call-template>
     </xsl:when>
     <xsl:otherwise>
        <xsl:value-of select="$path"/>
     </xsl:otherwise>
  </xsl:choose>
</xsl:template>


    <xsl:template name="alternated-row">
        <xsl:attribute name="class"><xsl:if test="position() mod 2 = 1">a</xsl:if><xsl:if test="position() mod 2 = 0">b</xsl:if></xsl:attribute>
    </xsl:template>

</xsl:stylesheet>