/usr/share/gtksourceview-3.0/language-specs/sweave.lang is in libgtksourceview-3.0-common 3.18.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<!--
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*<<.*>>=</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>
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