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/*
* Copyright 2007-2011 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
#define INPUT_DATA 1
/* This is for data sources to return, not for the wrapper. */
#define INPUT_EOD 2
#define INPUT_EOF 3
#define INPUT_LANG_EL 4
#define INPUT_TREE 5
#define INPUT_IGNORE 6
/*
* 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 LangEl;
struct Pattern;
struct PatternItem;
struct Replacement;
struct ReplItem;
struct _FsmRun;
struct ColmTree;
enum RunBufType {
RunBufDataType = 0,
RunBufTokenType,
RunBufIgnoreType,
RunBufSourceType
};
typedef struct _RunBuf
{
enum RunBufType type;
char data[FSM_BUFSIZE];
long length;
struct ColmTree *tree;
long offset;
struct _RunBuf *next, *prev;
} RunBuf;
RunBuf *newRunBuf();
typedef struct _SourceStream SourceStream;
struct SourceFuncs
{
/* Data. */
int (*getData)( SourceStream *is, int offset, char *dest, int length, int *copied );
int (*consumeData)( SourceStream *is, int length );
int (*undoConsumeData)( SourceStream *is, const char *data, int length );
/* Language elments (compile-time). */
struct LangEl *(*consumeLangEl)( SourceStream *is, long *bindId, char **data, long *length );
void (*undoConsumeLangEl)( SourceStream *is );
/* Private implmentation for some shared get data functions. */
int (*getDataImpl)( SourceStream *is, char *dest, int length );
};
struct _SourceStream
{
struct SourceFuncs *funcs;
struct _FsmRun *hasData;
char eofSent;
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;
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;
struct _FsmRun *attached;
};
SourceStream *newSourceStreamPattern( struct Pattern *pattern );
SourceStream *newSourceStreamRepl( struct Replacement *replacement );
SourceStream *newSourceStreamFile( FILE *file );
SourceStream *newSourceStreamFd( long fd );
void initInputFuncs();
void initStaticFuncs();
void initPatternFuncs();
void initReplFuncs();
/* List of input streams. Enables streams to be pushed/popped. */
struct _InputStream
{
char eofSent;
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;
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;
struct _FsmRun *attached;
};
typedef struct _InputStream InputStream;
/* The input stream interface. */
int getData( struct _FsmRun *fsmRun, InputStream *in, int offset, char *dest, int length, int *copied );
int consumeData( InputStream *in, int length );
int undoConsumeData( struct _FsmRun *fsmRun, InputStream *is, const char *data, int length );
struct ColmTree *consumeTree( InputStream *in );
void undoConsumeTree( InputStream *in, struct ColmTree *tree, int ignore );
struct LangEl *consumeLangEl( InputStream *in, long *bindId, char **data, long *length );
void undoConsumeLangEl( InputStream *in );
void setEof( InputStream *is );
void unsetEof( InputStream *is );
void prependData( InputStream *in, const char *data, long len );
int undoPrependData( InputStream *is, int length );
void prependTree( InputStream *is, struct ColmTree *tree, int ignore );
struct ColmTree *undoPrependTree( InputStream *is );
void appendData( InputStream *in, const char *data, long len );
void appendTree( InputStream *in, struct ColmTree *tree );
void appendStream( InputStream *in, struct ColmTree *tree );
struct ColmTree *undoAppendData( InputStream *in, int length );
struct ColmTree *undoAppendStream( InputStream *in );
struct ColmTree *undoAppendTree( InputStream *in );
#ifdef __cplusplus
}
#endif
#endif /* _INPUT_H */
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