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/*
* Copyright 2007-2012 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_EOS 4
#define INPUT_LANG_EL 5
#define INPUT_TREE 6
#define INPUT_IGNORE 7
/*
* 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 Constructor;
struct ConsItem;
struct _FsmRun;
struct colm_tree;
struct colm_location;
struct colm_program;
enum RunBufType {
RunBufDataType = 0,
RunBufTokenType,
RunBufIgnoreType,
RunBufSourceType
};
typedef struct _RunBuf
{
enum RunBufType type;
char data[FSM_BUFSIZE];
long length;
struct colm_tree *tree;
long offset;
struct _RunBuf *next, *prev;
} RunBuf;
RunBuf *newRunBuf();
typedef struct _StreamImpl StreamImpl;
struct StreamFuncs
{
int (*getParseBlock)( StreamImpl *ss, int skip, char **pdp, int *copied );
int (*getData)( StreamImpl *ss, char *dest, int length );
int (*consumeData)( StreamImpl *ss, int length, struct colm_location *loc );
int (*undoConsumeData)( StreamImpl *ss, const char *data, int length );
struct colm_tree *(*consumeTree)( StreamImpl *ss );
void (*undoConsumeTree)( StreamImpl *ss, struct colm_tree *tree, int ignore );
/* Language elments (compile-time). */
struct LangEl *(*consumeLangEl)( StreamImpl *ss, long *bindId, char **data, long *length );
void (*undoConsumeLangEl)( StreamImpl *ss );
/* Private implmentation for some shared get data functions. */
int (*getDataSource)( StreamImpl *ss, char *dest, int length );
void (*setEof)( StreamImpl *is );
void (*unsetEof)( StreamImpl *is );
/* Prepending to a stream. */
void (*prependData)( StreamImpl *in, const char *data, long len );
void (*prependTree)( StreamImpl *is, struct colm_tree *tree, int ignore );
void (*prependStream)( StreamImpl *in, struct colm_tree *tree );
int (*undoPrependData)( StreamImpl *is, int length );
struct colm_tree *(*undoPrependTree)( StreamImpl *is );
struct colm_tree *(*undoPrependStream)( StreamImpl *in );
/* Appending to a stream. */
void (*appendData)( StreamImpl *in, const char *data, long len );
void (*appendTree)( StreamImpl *in, struct colm_tree *tree );
void (*appendStream)( StreamImpl *in, struct colm_tree *tree );
struct colm_tree *(*undoAppendData)( StreamImpl *in, int length );
struct colm_tree *(*undoAppendTree)( StreamImpl *in );
struct colm_tree *(*undoAppendStream)( StreamImpl *in );
};
/* List of source streams. Enables streams to be pushed/popped. */
struct _StreamImpl
{
struct StreamFuncs *funcs;
char eofSent;
char eof;
char eosSent;
RunBuf *queue;
RunBuf *queueTail;
const char *data;
long dlen;
int offset;
long line;
long column;
long byte;
const char *name;
FILE *file;
long fd;
struct Pattern *pattern;
struct PatternItem *patItem;
struct Constructor *constructor;
struct ConsItem *consItem;
int consumed;
};
StreamImpl *newSourceStreamPat( const char *name, struct Pattern *pattern );
StreamImpl *newSourceStreamCons( const char *name, struct Constructor *constructor );
StreamImpl *newSourceStreamFile( const char *name, FILE *file );
StreamImpl *newSourceStreamFd( const char *name, long fd );
StreamImpl *newSourceStreamGeneric( const char *name );
void updatePosition( StreamImpl *inputStream, const char *data, long length );
void undoPosition( StreamImpl *inputStream, const char *data, long length );
#ifdef __cplusplus
}
#endif
#endif /* _INPUT_H */
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