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/*
* Copyright 2007-2010 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 <stdio.h>
#ifdef __cplusplus
extern "C" {
#endif
#define FSM_BUFSIZE 8192
//#define FSM_BUFSIZE 8
/*
* pdaRun <- fsmRun <- stream
*
* Activities we need to support:
*
* 1. Stuff data into an input stream each time we <<
* 2. Detach an input stream, and attach another when we include
* 3. Send data back to an input stream when the parser backtracks
* 4. Temporarily stop parsing due to a lack of input.
*
* At any given time, the fsmRun struct may have a prefix of the stream's
* input. If getting data we first get what we can out of the fsmRun, then
* consult the stream. If sending data back, we first shift pointers in the
* fsmRun, then ship to the stream. If changing streams the old stream needs to
* take back unprocessed data from the fsmRun.
*/
struct KlangEl;
struct Pattern;
struct PatternItem;
struct Replacement;
struct ReplItem;
struct _FsmRun;
struct _Tree;
enum RunBufType {
RunBufDataType = 0,
RunBufTokenType,
RunBufIgnoreType
};
typedef struct _RunBuf
{
enum RunBufType type;
char data[FSM_BUFSIZE];
long length;
struct _Tree *tree;
long offset;
struct _RunBuf *next, *prev;
} RunBuf;
RunBuf *newRunBuf();
typedef struct _InputStream InputStream;
struct InputFuncs
{
int (*isTree)( InputStream *is );
int (*isIgnore)( InputStream *is );
int (*isLangEl)( InputStream *is );
int (*isEof)( InputStream *is );
int (*needFlush)( InputStream *is );
int (*tryAgainLater)( InputStream *is );
int (*getData)( InputStream *is, char *dest, int length );
int (*getDataImpl)( InputStream *is, char *dest, int length );
struct _Tree *(*getTree)( InputStream *is );
struct KlangEl *(*getLangEl)( InputStream *is, long *bindId, char **data, long *length );
void (*pushTree)( InputStream *is, struct _Tree *tree, int ignore );
void (*pushText)( InputStream *is, const char *data, long len );
struct _Tree *(*undoPush)( InputStream *is, int length );
void (*appendData)( InputStream *is, const char *data, long len );
void (*appendTree)( InputStream *is, struct _Tree *tree );
struct _Tree *(*undoAppend)( InputStream *is, int length );
void (*pushBackNamed)( InputStream *is );
void (*pushBackBuf)( InputStream *is, RunBuf *runBuf );
};
extern struct InputFuncs baseFuncs;
extern struct InputFuncs stringFuncs;
extern struct InputFuncs fileFuncs;
extern struct InputFuncs fdFuncs;
extern struct InputFuncs accumFuncs;
extern struct InputFuncs staticFuncs;
extern struct InputFuncs patternFuncs;
extern struct InputFuncs replFuncs;
struct _InputStream
{
struct InputFuncs *funcs;
struct _FsmRun *hasData;
char eofSent;
char flush;
char eof;
long line;
long column;
long byte;
/* This is set true for input streams that do their own line counting.
* Causes FsmRun to ignore NLs. */
int handlesLine;
int later;
RunBuf *queue;
RunBuf *queueTail;
const char *data;
long dlen;
int offset;
FILE *file;
long fd;
struct Pattern *pattern;
struct PatternItem *patItem;
struct Replacement *replacement;
struct ReplItem *replItem;
};
RunBuf *inputStreamHead( InputStream *is );
RunBuf *inputStreamTail( InputStream *is );
RunBuf *inputStreamPopHead( InputStream *is );
RunBuf *inputStreamPopTail( InputStream *is );
void inputStreamAppend( InputStream *is, RunBuf *runBuf );
void inputStreamPrepend( InputStream *is, RunBuf *runBuf );
InputStream *newInputStreamPattern( struct Pattern *pattern );
InputStream *newInputStreamRepl( struct Replacement *replacement );
InputStream *newInputStreamFile( FILE *file );
InputStream *newInputStreamFd( long fd );
InputStream *newInputStreamAccum();
void initInputFuncs();
void initStaticFuncs();
void initPatternFuncs();
void initReplFuncs();
#ifdef __cplusplus
}
#endif
#endif /* _INPUT_H */
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