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/*************************************************************************
** AttributeExtractor.hpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2022 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 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;
};
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