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/*
* Copyright 2007, 2008 Adrian Thurston <thurston@complang.org>
*/
/* This file is part of Colm.
*
* Colm 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 2 of the License, or
* (at your option) any later version.
*
* Colm 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 Colm; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _INPUT_H
#define _INPUT_H
#include "astring.h"
struct KlangEl;
struct Pattern;
struct PatternItem;
struct Replacement;
struct ReplItem;
struct RunBuf;
struct InputStream
{
InputStream( bool handlesLine ) :
line(1),
position(0),
handlesLine(handlesLine) {}
virtual ~InputStream() {}
/* Basic functions. */
virtual int getData( char *dest, int length ) = 0;
virtual int isEOF() = 0;
virtual int needFlush() = 0;
virtual void pushBack( char *data, long len )
{ assert(false); }
virtual void pushBack( RunBuf *runBuf )
{ assert(false); }
/* Named language elements for patterns and replacements. */
virtual int isLangEl() { return false; }
virtual KlangEl *getLangEl( long &bindId, char *&data, long &length )
{ assert( false ); return 0; }
virtual void pushBackNamed()
{ assert( false ); }
long line;
long position;
/* This is set true for input streams that do their own line counting.
* Causes FsmRun to ignore NLs. */
bool handlesLine;
};
struct InputStreamString : public InputStream
{
InputStreamString( const String &data ) :
InputStream(false),
data(data), offset(0), eof(false) {}
int getData( char *dest, int length );
int isEOF() { return eof; }
int needFlush() { return eof; }
void pushBack( char *data, long len );
String data;
int offset;
bool eof;
};
struct InputStreamFile : public InputStream
{
InputStreamFile( FILE *file ) :
InputStream(false),
file(file), queue(0) {}
int getData( char *dest, int length );
int isEOF();
int needFlush();
void pushBack( RunBuf *runBuf );
FILE *file;
RunBuf *queue;
};
struct InputStreamFD : public InputStream
{
InputStreamFD( long fd ) :
InputStream(false),
fd(fd), eof(false), queue(0) {}
int isEOF();
int needFlush();
int getData( char *dest, int length );
void pushBack( RunBuf *runBuf );
long fd;
bool eof;
RunBuf *queue;
};
struct InputStreamPattern : public InputStream
{
InputStreamPattern( Pattern *pattern );
int isLangEl();
int getData( char *dest, int length );
KlangEl *getLangEl( long &bindId, char *&data, long &length );
int isEOF();
int needFlush();
void pushBack( char *data, long len );
void pushBackNamed();
void backup();
int shouldFlush();
Pattern *pattern;
PatternItem *patItem;
int offset;
bool flush;
};
struct InputStreamRepl : public InputStream
{
InputStreamRepl( Replacement *replacement );
int isLangEl();
int getData( char *dest, int length );
KlangEl *getLangEl( long &bindId, char *&data, long &length );
int isEOF();
int needFlush();
void pushBack( char *data, long len );
void pushBackNamed();
void backup();
int shouldFlush();
Replacement *replacement;
ReplItem *replItem;
int offset;
bool flush;
};
#endif /* _INPUT_H */
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