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/*
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of the
* License, or (at your option) any later version. This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _XEN_LIB_SXPR_PARSER_H_
#define _XEN_LIB_SXPR_PARSER_H_
#include "sxpr.h"
#include "iostream.h"
/** @file
* Sxpr parsing definitions.
*/
/** Size of a parser input buffer.
* Tokens read must fit into this size (including trailing null).
*/
#define PARSER_BUF_SIZE 1024
struct Parser;
typedef int ParserStateFn(struct Parser *, char c);
typedef struct ParserState {
struct ParserState *parent;
Sxpr val;
int ival;
int count;
char delim;
ParserStateFn *fn;
} ParserState;
/** Structure representing an input source for the parser.
* Can read from any IOStream implementation.
*/
typedef struct Parser {
Sxpr val;
/** Error reporting stream (null for no reports). */
IOStream *error_out;
int eof;
/** Error flag. Non-zero if there has been a read error. */
int err;
/** Line number on input (from 1). */
int line_no;
/** Column number of input (reset on new line). */
int char_no;
/** Lookahead character. */
char c;
/** Buffer for reading tokens. */
char buf[PARSER_BUF_SIZE];
/** Size of token buffer. */
int buf_n;
int buf_i;
/** Line the last token started on. */
int tok_begin_line;
/** Character number the last token started on. */
int tok_begin_char;
/** Parsing flags. */
int flags;
ParserState *state;
} Parser;
/** Parser error codes. */
typedef enum {
PARSE_ERR_NONE=0,
PARSE_ERR_UNSPECIFIED,
PARSE_ERR_NOMEM,
PARSE_ERR_UNEXPECTED_EOF,
PARSE_ERR_TOKEN_TOO_LONG,
PARSE_ERR_INVALID_SYNTAX,
PARSE_ERR_INVALID_ESCAPE,
} ParseErrorId;
/** Parser flags. */
//enum {
//};
/** Raise some parser flags.
*
* @param in parser
* @param flags flags mask
*/
inline static void parser_flags_raise(Parser *in, int flags){
in->flags |= flags;
}
/** Lower some parser flags.
*
* @param in parser
* @param flags flags mask
*/
inline static void parser_flags_lower(Parser *in, int flags){
in->flags &= ~flags;
}
/** Clear all parser flags.
*
* @param in parser
*/
inline static void parser_flags_clear(Parser *in){
in->flags = 0;
}
extern void Parser_free(Parser *z);
extern Parser * Parser_new(void);
extern int Parser_input(Parser *p, char *buf, int buf_n);
extern int Parser_input_eof(Parser *p);
extern int parse_error_message(Parser *in, char *buf, int n);
extern int has_error(Parser *in);
extern int at_eof(Parser *in);
#endif /* ! _XEN_LIB_SXPR_PARSER_H_ */
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