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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
struct LangEl;
struct Pattern;
struct PatternItem;
struct Constructor;
struct ConsItem;
struct colm_tree;
struct colm_stream;
struct colm_location;
struct colm_program;
struct colm_struct;
struct stream_impl;
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 *new_run_buf();
struct StreamFuncs
{
int (*get_parse_block)( struct stream_impl *ss, int skip, char **pdp, int *copied );
int (*get_data)( struct stream_impl *ss, char *dest, int length );
int (*consume_data)( struct colm_program *prg, struct colm_tree **sp,
struct stream_impl *ss, int length, struct colm_location *loc );
int (*undo_consume_data)( struct stream_impl *ss, const char *data, int length );
struct colm_tree *(*consume_tree)( struct stream_impl *ss );
void (*undo_consume_tree)( struct stream_impl *ss,
struct colm_tree *tree, int ignore );
/* Language elments (compile-time). */
struct LangEl *(*consume_lang_el)( struct stream_impl *ss,
long *bind_id, char **data, long *length );
void (*undo_consume_lang_el)( struct stream_impl *ss );
/* Private implmentation for some shared get data functions. */
int (*get_data_source)( struct stream_impl *ss, char *dest, int length );
void (*set_eof)( struct stream_impl *is );
void (*unset_eof)( struct stream_impl *is );
/* Prepending to a stream. */
void (*prepend_data)( struct stream_impl *in, const char *data, long len );
void (*prepend_tree)( struct stream_impl *is, struct colm_tree *tree, int ignore );
void (*prepend_stream)( struct stream_impl *in, struct colm_tree *tree );
int (*undo_prepend_data)( struct stream_impl *is, int length );
struct colm_tree *(*undo_prepend_tree)( struct stream_impl *is );
struct colm_tree *(*undo_prepend_stream)( struct stream_impl *in );
/* Appending to a stream. */
void (*append_data)( struct stream_impl *in, const char *data, long len );
void (*append_tree)( struct stream_impl *in, struct colm_tree *tree );
void (*append_stream)( struct stream_impl *in, struct colm_tree *tree );
struct colm_tree *(*undo_append_data)( struct stream_impl *in, int length );
struct colm_tree *(*undo_append_tree)( struct stream_impl *in );
struct colm_tree *(*undo_append_stream)( struct stream_impl *in );
};
/* List of source streams. Enables streams to be pushed/popped. */
struct stream_impl
{
struct StreamFuncs *funcs;
char eof_sent;
char eof;
char eos_sent;
RunBuf *queue;
RunBuf *queue_tail;
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 *pat_item;
struct Constructor *constructor;
struct ConsItem *cons_item;
int consumed;
};
struct stream_impl *colm_impl_new_pat( const char *name, struct Pattern *pattern );
struct stream_impl *colm_impl_new_cons( const char *name, struct Constructor *constructor );
struct stream_impl *colm_impl_new_file( const char *name, FILE *file );
struct stream_impl *colm_impl_new_fd( const char *name, long fd );
struct stream_impl *colm_impl_new_generic( const char *name );
void update_position( struct stream_impl *input_stream, const char *data, long length );
void undo_position( struct stream_impl *input_stream, const char *data, long length );
struct stream_impl *colm_stream_impl( struct colm_struct *s );
#ifdef __cplusplus
}
#endif
#endif /* _INPUT_H */
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