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/*================================================================
* slist.h:
* S-expression list
*
* Copyright (C) 1996-1999 Takashi Iwai
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*================================================================*/
#ifndef SLIST_H_DEF
#define SLIST_H_DEF
enum { S_ATOM_NIL, S_ATOM_LIST, S_ATOM_CHR, S_ATOM_INT, S_ATOM_STR, S_ATOM_FUN, };
typedef struct _SAtom *SList;
typedef union {
char c;
int i;
char *s;
char *f;
SList p;
} SAtomVal;
typedef struct _SAtom {
int type;
SAtomVal val, nxt;
} SAtom;
SList SCons(void);
SList SReadFile(FILE *fp);
void SFree(SList);
#define NIL (SList)0
#define SIsNil(at) ((at)->type == S_ATOM_NIL)
#define SListP(at) ((at)->type == S_ATOM_LIST)
#define SChrP(at) ((at)->type == S_ATOM_CHR)
#define SIntP(at) ((at)->type == S_ATOM_INT)
#define SStrP(at) ((at)->type == S_ATOM_STR)
#define SFunP(at) ((at)->type == S_ATOM_FUN)
#define SCar(at) ((at)->val.p)
#define SCdr(at) ((at)->nxt.p)
#define SChr(at) ((at)->val.c)
#define SStr(at) ((at)->val.s)
#define SInt(at) ((at)->val.i)
#define SFun(at) ((at)->val.f)
#define SFunIs(at,fun) (strcmp(SFun(at),fun) == 0)
int SIndex(SList);
#endif
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