#ifdef __cplusplus
extern "C" {
#endif

/*
    This software may only be used by you under license from AT&T Corp.
    ("AT&T").  A copy of AT&T's Source Code Agreement is available at
    AT&T's Internet website having the URL:
    <http://www.research.att.com/sw/tools/graphviz/license/source.html>
    If you received this software without first entering into a license
    with AT&T, you have an infringing copy of this software and cannot use
    it without violating AT&T's intellectual property rights.
*/


#ifndef _GRAPH_H
#define _GRAPH_H 1

#if _PACKAGE_ast
#include    <ast.h>
#else
#include <sys/types.h>
#include <stdlib.h>
#endif
#include <stdio.h>
#include "cdt.h"

typedef struct Agraph_t		Agraph_t;
typedef struct Agnode_t		Agnode_t;
typedef struct Agedge_t		Agedge_t;
typedef struct Agdict_t		Agdict_t;
typedef struct Agsym_t		Agsym_t;
typedef struct Agdata_t		Agdata_t;
typedef struct Agproto_t	Agproto_t;

typedef char * (*gets_f)(char *ubuf, int n, FILE *fp);

#define AGFLAG_DIRECTED		(1<<0)
#define AGFLAG_STRICT		(1<<1)
#define AGFLAG_METAGRAPH	(1<<2)

#define	AGRAPH				0
#define	AGRAPHSTRICT		(AGRAPH | AGFLAG_STRICT)
#define AGDIGRAPH 			AGFLAG_DIRECTED
#define AGDIGRAPHSTRICT		(AGDIGRAPH | AGFLAG_STRICT)
#define AGMETAGRAPH			(AGFLAG_DIRECTED | AGFLAG_STRICT | AGFLAG_METAGRAPH)

#define AG_IS_DIRECTED(g)	((g)->kind & AGFLAG_DIRECTED)
#define AG_IS_STRICT(g)		((g)->kind & AGFLAG_STRICT)
#define AG_IS_METAGRAPH(g)	((g)->kind & AGFLAG_METAGRAPH)
#define aginit()			aginitlib(sizeof(Agraph_t),sizeof(Agnode_t),sizeof(Agedge_t))

struct Agraph_t {
	int				tag : 4;
	int				kind : 4;
	int				handle: 24;
	char			**attr;
	char			*name;
	Agdata_t		*univ;
	Dict_t			*nodes,*inedges,*outedges;
	Agraph_t		*root;
	Agnode_t		*meta_node;
	Agproto_t		*proto;
	Agraphinfo_t	u;
};

struct Agnode_t {
	int				tag : 4;
	int				pad : 4;
	int				handle: 24;
	char			**attr;
	char			*name;
	int				id;
	Agraph_t		*graph;
	Agnodeinfo_t	u;
};

struct Agedge_t {
	int				tag : 4;
	int				printkey : 4;
	int				handle: 24;
	char			**attr;
	Agnode_t		*head,*tail;
	int				id;
	Agedgeinfo_t	u;
};

struct Agdata_t {				/* for main graph */
	Dict_t			*node_dict;
	Agdict_t		*nodeattr;
	Agdict_t		*edgeattr;
	Agdict_t		*globattr;
	int				max_node_id, max_edge_id;
};

struct Agsym_t {
	char			*name,*value;
	int				index;
	unsigned char	printed;
};

struct Agdict_t  {
	char			*name;
	Dict_t			*dict;
	Agsym_t			**list;
};

struct Agproto_t {
	Agnode_t		*n;
	Agedge_t		*e;
	Agproto_t		*prev;
};

#if _PACKAGE_ast
_BEGIN_EXTERNS_ /* public data */
#if _BLD_graph && defined(__EXPORT__)
#define extern  __EXPORT__
#endif
#if !_BLD_graph && defined(__IMPORT__) && 0
#define extern  __IMPORT__
#endif
#endif

extern char		*agstrcanon(char	*,	char	*);
extern int		aghtmlstr (char* s);
extern char		*agget(void*,	char	*);
extern char		*agxget(void*,	int);
extern int 		agset(void*,	char	*,	char	*);
extern int 		agxset(void*,	int,	char	*);
extern int		agindex(void*,	char	*);

extern void     aginitlib(int,  int,    int);  
extern Agraph_t	*agopen(char	*,	int);
extern Agraph_t	*agsubg(Agraph_t	*,	char	*);
extern Agraph_t	*agfindsubg(Agraph_t	*,	char	*);
extern void		agclose(Agraph_t	*);
extern void    	agoverride(int);
extern Agraph_t	*agread(FILE  	*);
extern Agraph_t	*agread_usergets(FILE  	*, gets_f);
extern void		agreadline(int);
extern void		agsetfile(char*);
extern Agraph_t	*agmemread(char  	*);
extern int		agwrite(Agraph_t	*,	FILE	*);
extern int		agerrors(void);
extern Agraph_t	*agprotograph();
extern Agraph_t	*agusergraph(Agnode_t	*);
extern int		agnnodes(Agraph_t	*);
extern int		agnedges(Agraph_t	*);

extern void		aginsert(Agraph_t	*,	void*);
extern void		agdelete(Agraph_t	*,	void*);
extern int		agcontains(Agraph_t	*,	void*);

extern Agnode_t	*agnode(Agraph_t	*,	char	*);
extern Agsym_t	*agnodeattr(Agraph_t	*,	char	*,	char	*);
extern Agnode_t	*agfindnode(Agraph_t	*,	char	*);
extern Agnode_t	*agfstnode(Agraph_t	*);
extern Agnode_t	*agnxtnode(Agraph_t	*,	Agnode_t	*);

extern Agedge_t	*agedge(Agraph_t	*,	Agnode_t	*,	Agnode_t	*);
extern Agsym_t	*agedgeattr(Agraph_t	*,	char	*,	char	*);
extern Agedge_t	*agfindedge(Agraph_t	*,	Agnode_t	*,	Agnode_t	*);
extern Agedge_t	*agfstedge(Agraph_t	*,	Agnode_t	*);
extern Agedge_t	*agnxtedge(Agraph_t	*,	Agedge_t	*,	Agnode_t	*);
extern Agedge_t	*agfstin(Agraph_t	*,	Agnode_t	*);
extern Agedge_t	*agnxtin(Agraph_t	*,	Agedge_t	*);
extern Agedge_t	*agfstout(Agraph_t	*,	Agnode_t	*);
extern Agedge_t	*agnxtout(Agraph_t	*,	Agedge_t	*);

extern Agsym_t	*agraphattr(Agraph_t	*,	char	*,	char	*);
extern Agsym_t	*agnodeattr(Agraph_t	*,	char	*,	char	*);
extern Agsym_t	*agedgeattr(Agraph_t	*,	char	*,	char	*);
extern Agsym_t	*agfindattr(void*,	char	*);

typedef enum {AGWARN, AGERR, AGMAX, AGPREV} agerrlevel_t;
extern agerrlevel_t agerrno;
extern void agseterr (agerrlevel_t);
extern char* aglasterr ();
extern int agerr (agerrlevel_t level, char* fmt, ...);
extern void agerrorf (char* fmt, ...);
extern void agwarningf (char* fmt, ...);

typedef enum {AGNODE = 1, AGEDGE, AGGRAPH } agobjkind_t;
#define agobjkind(p)		((agobjkind_t)(((Agraph_t*)(p))->tag))

#define agmetanode(g)		((g)->meta_node)

#undef extern
#if _PACKAGE_ast
_END_EXTERNS_
#endif

#endif 	/* _GRAPH_H */

#ifdef __cplusplus
}
#endif
