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diff --git a/Build/source/texk/dvisvgm/dvisvgm-src/src/optimizer/AttributeExtractor.hpp b/Build/source/texk/dvisvgm/dvisvgm-src/src/optimizer/AttributeExtractor.hpp
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+/*************************************************************************
+** AttributeExtractor.hpp **
+** **
+** This file is part of dvisvgm -- a fast DVI to SVG converter **
+** Copyright (C) 2005-2019 Martin Gieseking <martin.gieseking@uos.de> **
+** **
+** This program is free software; you can redistribute it and/or **
+** modify it under the terms of the GNU General Public License as **
+** published by the Free Software Foundation; either version 3 of **
+** the License, or (at your option) any later version. **
+** **
+** This program 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 General Public License for more details. **
+** **
+** You should have received a copy of the GNU General Public License **
+** along with this program; if not, see <http://www.gnu.org/licenses/>. **
+*************************************************************************/
+
+#pragma once
+
+#include <set>
+#include <string>
+#include "OptimizerModule.hpp"
+#include "../XMLNode.hpp"
+
+/** Moves common attributes of adjacent elements to enclosing groups. */
+class AttributeExtractor : public OptimizerModule {
+ using Attribute = XMLElement::Attribute;
+
+ /** Represents a range of adjacent nodes where all elements have a common attribute. */
+ struct AttributeRun {
+ public:
+ AttributeRun (const Attribute &attr, XMLElement *first);
+ XMLNode* first () {return _first;}
+ XMLNode* last () {return _last;}
+ int length () const {return _length;}
+
+ private:
+ int _length; ///< run length excluding non-element nodes
+ XMLNode *_first, *_last; ///< first and last node in run
+ };
+
+ public:
+ void execute (XMLElement*, XMLElement *context) override {execute(context, true);};
+ const char* info () const override;
+ static bool groupable (const XMLElement &elem);
+ static bool inheritable (const Attribute &attrib);
+ static bool extractable (const Attribute &attr, XMLElement &element);
+
+ protected:
+ void execute (XMLElement *context, bool recurse);
+ XMLNode* extractAttribute (XMLElement *elem);
+ bool extracted (const Attribute &attr) const;
+
+ private:
+ std::set<std::string> _extractedAttributes;
+ static constexpr int MIN_RUN_LENGTH = 3;
+};
+