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/*************************************************************************
** PSInterpreter.h **
** **
** This file is part of dvisvgm -- the DVI to SVG converter **
** Copyright (C) 2005-2011 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 PSINTERPRETER_H
#define PSINTERPRETER_H
#include <cstring>
#include <istream>
#include <string>
#include <vector>
#include "Ghostscript.h"
#include "InputReader.h"
#include "MessageException.h"
struct PSException : public MessageException
{
PSException (const std::string &msg) : MessageException(msg) {}
};
/** This interface provides the template methods called by PSInterpreter when executing a PS snippet.
* Each method corresponds to a PostScript operator of the same name. */
struct PSActions
{
virtual ~PSActions () {}
virtual void applyscalevals (std::vector<double> &p) =0;
virtual void clip (std::vector<double> &p) =0;
virtual void closepath (std::vector<double> &p) =0;
virtual void curveto (std::vector<double> &p) =0;
virtual void eoclip (std::vector<double> &p) =0;
virtual void eofill (std::vector<double> &p) =0;
virtual void fill (std::vector<double> &p) =0;
virtual void gsave (std::vector<double> &p) =0;
virtual void grestore (std::vector<double> &p) =0;
virtual void grestoreall (std::vector<double> &p) =0;
virtual void initclip (std::vector<double> &p) =0;
virtual void lineto (std::vector<double> &p) =0;
virtual void moveto (std::vector<double> &p) =0;
virtual void newpath (std::vector<double> &p) =0;
virtual void querypos (std::vector<double> &p) =0;
virtual void restore (std::vector<double> &p) =0;
virtual void rotate (std::vector<double> &p) =0;
virtual void save (std::vector<double> &p) =0;
virtual void scale (std::vector<double> &p) =0;
virtual void setcmykcolor (std::vector<double> &cmyk) =0;
virtual void setdash (std::vector<double> &p) =0;
virtual void setgray (std::vector<double> &p) =0;
virtual void sethsbcolor (std::vector<double> &hsb) =0;
virtual void setlinecap (std::vector<double> &p) =0;
virtual void setlinejoin (std::vector<double> &p) =0;
virtual void setlinewidth (std::vector<double> &p) =0;
virtual void setmatrix (std::vector<double> &p) =0;
virtual void setmiterlimit (std::vector<double> &p) =0;
virtual void setopacityalpha (std::vector<double> &p) =0;
virtual void setrgbcolor (std::vector<double> &rgb) =0;
virtual void stroke (std::vector<double> &p) =0;
virtual void translate (std::vector<double> &p) =0;
virtual void executed () {} // triggered if one of the above PS operators has been executed
};
/** This class provides methods to execute chunks of PostScript code and calls
* several template methods on invocation of selected PS operators (see PSActions). */
class PSInterpreter
{
enum Mode {PS_NONE, PS_RUNNING, PS_QUIT};
public:
PSInterpreter (PSActions *actions=0);
void execute (const char *str, size_t len, bool flush=true);
void execute (const char *str) {execute(str, std::strlen(str));}
void execute (const std::string &str) {execute(str.c_str());}
void execute (std::istream &is);
bool active () const {return _mode != PS_QUIT;}
PSActions* setActions (PSActions *actions);
protected:
void init ();
// callback functions
static int GSDLLCALL input (void *inst, char *buf, int len);
static int GSDLLCALL output (void *inst, const char *buf, int len);
static int GSDLLCALL error (void *inst, const char *buf, int len);
void callActions (InputReader &cib);
private:
Ghostscript _gs;
Mode _mode; ///< current execution mode
PSActions *_actions; ///< actions to be performed
std::vector<char> _linebuf;
std::string _errorMessage; ///< text of error message
bool _inError; ///< true if scanning error message
bool _initialized; ///< true if PSInterpreter has been completely initialized
static const char *GSARGS[]; ///< parameters passed to Ghostscript
static const char *PSDEFS; ///< initial PostScript definitions
};
#endif
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