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/*************************************************************************
** DvisvgmSpecialHandler.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/>. **
*************************************************************************/
#ifndef DVISVGMSPECIALHANDLER_HPP
#define DVISVGMSPECIALHANDLER_HPP
#include <memory>
#include <string>
#include <unordered_map>
#include <vector>
#include "SpecialHandler.hpp"
class InputReader;
class SpecialActions;
class SVGElement;
class SVGTree;
class XMLElement;
class XMLNode;
#ifdef _MSC_VER
// MSVC: Prevent aggressive optimization of pointers to member functions.
// Instatiating class DvisvgmSpecialHandler without the following pragma
// leads to memory corruption.
// https://docs.microsoft.com/en-us/cpp/preprocessor/pointers-to-members
#pragma pointers_to_members(full_generality, single_inheritance)
#endif
class DvisvgmSpecialHandler : public SpecialHandler {
class XMLParser {
using AppendFunc = void (SVGTree::*)(std::unique_ptr<XMLNode>);
using PushFunc = void (SVGTree::*)(std::unique_ptr<SVGElement>);
using PopFunc = void (SVGTree::*)();
using NameStack = std::vector<std::string>;
public:
XMLParser (AppendFunc append, PushFunc push, PopFunc pop)
: _append(append), _pushContext(push), _popContext(pop) {}
void parse (const std::string &xml, SpecialActions &actions, bool finish=false);
void finish (SpecialActions &actions);
protected:
void openElement (const std::string &tag, SpecialActions &actions);
void closeElement (const std::string &tag, SpecialActions &actions);
private:
AppendFunc _append;
PushFunc _pushContext;
PopFunc _popContext;
std::string _xmlbuf;
NameStack _nameStack; ///< names of nested elements still missing a closing tag
bool _error=false;
};
using StringVector = std::vector<std::string>;
using MacroMap = std::unordered_map<std::string, StringVector>;
public:
DvisvgmSpecialHandler ();
const char* name () const override {return "dvisvgm";}
const char* info () const override {return "special set for embedding raw SVG snippets";}
std::vector<const char*> prefixes() const override;
void preprocess (const std::string &prefix, std::istream &is, SpecialActions &actions) override;
bool process (const std::string &prefix, std::istream &is, SpecialActions &actions) override;
protected:
void preprocessRaw (InputReader &ir);
void preprocessRawDef (InputReader &ir);
void preprocessRawSet (InputReader &ir);
void preprocessEndRawSet (InputReader &ir);
void preprocessRawPut (InputReader &ir);
void processRaw (InputReader &ir, SpecialActions &actions);
void processRawDef (InputReader &ir, SpecialActions &actions);
void processRawSet (InputReader &ir, SpecialActions &actions);
void processEndRawSet (InputReader &ir, SpecialActions &actions);
void processRawPut (InputReader &ir, SpecialActions &actions);
void processBBox (InputReader &ir, SpecialActions &actions);
void processImg (InputReader &ir, SpecialActions &actions);
void dviPreprocessingFinished () override;
void dviEndPage (unsigned pageno, SpecialActions &actions) override;
private:
MacroMap _macros;
MacroMap::iterator _currentMacro;
int _nestingLevel=0; ///< nesting depth of rawset specials
XMLParser _defsParser; ///< parses XML added by 'rawdef' specials
XMLParser _pageParser; ///< parses XML added by 'raw' specials
};
#endif
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