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/*************************************************************************
** InputReader.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/>. **
*************************************************************************/
#ifndef INPUTREADER_HPP
#define INPUTREADER_HPP
#include <istream>
#include <string>
#include <unordered_map>
#include <vector>
#include "InputBuffer.hpp"
class InputReader {
public:
virtual ~InputReader() =default;
virtual int get () =0;
virtual int peek () const =0;
virtual int peek (size_t n) const =0;
virtual bool eof () const =0;
virtual bool check (char c) const {return peek() == c;}
virtual bool check (const char *s, bool consume=true);
virtual void skip (size_t n);
virtual bool skipUntil (const char *s);
virtual int find (char c) const;
virtual void skipSpace ();
virtual int getInt ();
virtual bool parseInt (int &val, bool accept_sign=true);
virtual bool parseUInt (int base, unsigned &val);
virtual bool parseUInt (unsigned &val);
virtual char parseDouble (double &val);
virtual double getDouble ();
virtual std::string getWord ();
virtual char getPunct ();
virtual std::string getQuotedString (char quotechar);
virtual std::string getString ();
virtual std::string getString (size_t n);
virtual std::string getString (const char *delim);
virtual std::string getLine ();
virtual int parseAttributes (std::unordered_map<std::string,std::string> &attr, char quotechar=0);
virtual operator bool () const {return !eof();}
};
class StreamInputReader : public InputReader {
public:
StreamInputReader (std::istream &is) : _is(is) {}
int get () override {return _is.get();}
int peek () const override {return _is.peek();}
int peek (size_t n) const override;
bool eof () const override {return !_is || _is.eof();}
std::istream& getStream () {return _is;}
private:
std::istream &_is;
};
class BufferInputReader : public InputReader {
public:
BufferInputReader (InputBuffer &ib) : _ib(&ib) {}
void assign (InputBuffer &ib) {_ib = &ib;}
int get () override {return _ib->get();}
int peek () const override {return _ib->peek();}
int peek (size_t n) const override {return _ib->peek(n);}
bool eof () const override {return _ib->eof();}
private:
InputBuffer *_ib;
};
/** Implementation of the Knuth-Morris-Pratt search algorithm.
* http://www.inf.fh-flensburg.de/lang/algorithmen/pattern/kmpen.htm */
class StringMatcher {
public:
StringMatcher () : _charsRead(0) {}
StringMatcher (const std::string &pattern) : _charsRead(0) {setPattern(pattern);}
void setPattern (const std::string &pattern);
bool match (InputReader &ir);
size_t charsRead () const {return _charsRead;}
private:
std::string _pattern;
std::vector<size_t> _borders;
size_t _charsRead;
};
#endif
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