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/usr/share/gtksourceview-3.0/language-specs/sweave.lang is in libgtksourceview-3.0-common 3.18.2-1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<!--

 This file is part of GtkSourceView

 Authors: Lawrence Hudson
 Copyright (C) 2010, 2014 Lawrence Hudson <quicklizard@googlemail.com>

 GtkSourceView is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 GtkSourceView is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

-->

<language id="sweave" _name="Sweave" version="2.0" _section="Markup">
  <metadata>
    <property name="globs">*.rnw;*.Rnw;*.snw;*.Snw</property>
    <property name="line-comment-start">%</property>
  </metadata>

  <styles>
    <style id="comment"            _name="Comment"    map-to="latex:comment"/>
    <style id="command"            _name="Command"    map-to="latex:command"/>
    <style id="verbatim"           _name="Verbatim"   map-to="latex:verbatim"/>
  </styles>

  <definitions>
    <context id="inline-R" class="no-spell-check">
      <match>(\\Sexpr)\{([^\}]*)\}</match>
      <include>
        <context sub-pattern="1" style-ref="command"/>
        <context sub-pattern="2" style-ref="verbatim"/>
      </include>
    </context>

    <context id="R-block" class="no-spell-check">
      <start>^\s*&lt;&lt;.*&gt;&gt;=</start>
      <end>@</end>
      <include>
        <context sub-pattern="0" where="start" style-ref="command"/>
        <context sub-pattern="0" where="end" style-ref="command"/>
        <context ref="r:r"/>
        <context id="R-slot" class="no-spell-check">
          <match>[[:alnum:]]@[[:alnum:]]</match>
        </context>
      </include>
    </context>

    <context id="sweave">
      <include>
        <context ref="inline-R"/>
        <context ref="R-block"/>
        <context ref="latex:latex"/>
      </include>
    </context>
  </definitions>
</language>