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/*************************************************************************
** HtmlSpecialHandler.hpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2017 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 HTMLSPECIALHANDLER_HPP
#define HTMLSPECIALHANDLER_HPP
#include <map>
#include <string>
#include "Color.hpp"
#include "SpecialHandler.hpp"
class SpecialActions;
class HtmlSpecialHandler : public SpecialHandler, public DVIEndPageListener, public DVIPositionListener
{
struct NamedAnchor {
NamedAnchor () : pageno(0), id(0), pos(0), referenced(false) {}
NamedAnchor (unsigned pn, int i, double p, bool r=false) : pageno(pn), id(i), pos(p), referenced(r) {}
unsigned pageno; ///< page number where the anchor is located
int id; ///< unique numerical ID (< 0 if anchor is undefined yet)
double pos; ///< vertical position of named anchor (in PS point units)
bool referenced; ///< true if a reference to this anchor exists
};
enum class AnchorType {NONE, HREF, NAME};
typedef std::map<std::string, NamedAnchor> NamedAnchors;
public:
HtmlSpecialHandler () : _active(false), _anchorType(AnchorType::NONE), _depthThreshold(0) {}
void preprocess (const char *prefix, std::istream &is, SpecialActions &actions) override;
bool process (const char *prefix, std::istream &is, SpecialActions &actions) override;
const char* name () const override {return "html";}
const char* info () const override {return "hyperref specials";}
const char** prefixes () const override;
static bool setLinkMarker (const std::string &marker);
protected:
void preprocessHrefAnchor (const std::string &uri);
void preprocessNameAnchor (const std::string &name, SpecialActions &actions);
void processHrefAnchor (std::string uri, SpecialActions &actions);
void processNameAnchor (const std::string &name, SpecialActions &actions);
void dviEndPage (unsigned pageno, SpecialActions &actions) override;
void dviMovedTo (double x, double y, SpecialActions &actions) override;
void closeAnchor (SpecialActions &actions);
void markLinkedBox (SpecialActions &actions);
enum class MarkerType {NONE, LINE, BOX, BGCOLOR};
static MarkerType MARKER_TYPE; ///< selects how to mark linked areas
static Color LINK_BGCOLOR; ///< background color if linkmark type == LT_BGCOLOR
static Color LINK_LINECOLOR; ///< line color if linkmark type is LM_LINE or LM_BOX
static bool USE_LINECOLOR; ///< if true, LINK_LINECOLOR is applied
private:
bool _active;
AnchorType _anchorType; ///< type of active anchor
int _depthThreshold; ///< break anchor box if the DVI stack depth underruns this threshold
std::string _base; ///< base URL that is prepended to all relative targets
NamedAnchors _namedAnchors; ///< information about all named anchors processed
};
#endif
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