1 enum slugtypes {
2 	NONE,		// can't happen
3 	VBOX,		// Vertical Box -- printable stuff
4 	SP,		// paddable SPace
5 	BS,		// start Breakable Stream
6 	US,		// start Unbreakable Stream
7 	BF,		// start Breakable Float
8 	UF,		// start Unbreakable Float
9 	PT,		// start Page Top material (header)
10 	BT,		// start page BoTtom material (footer)
11 	END,		// ENDs of groups
12 	NEUTRAL,	// NEUTRALized slugs can do no harm (cf. CIA)
13 	PAGE,		// beginning of PAGE in troff input
14 	TM,		// Terminal Message to appear during output
15 	COORD,		// output page COORDinates
16 	NE,		// NEed command
17 	MC,		// Multiple-Column command
18 	CMD,		// misc CoMmanDs:  FC, FL, BP
19 	PARM,		// misc PARaMeters:  NP, FO
20 	LASTTYPE	// can't happen either
21 };
22 
23 enum cmdtypes {
24 	FC,	// Freeze 2-Column material
25 	FL,	// FLush all floats before reading more stream
26 	BP	// Break Page
27 };
28 
29 enum parmtypes {
30 	NP,	// distance of top margin from page top (New Page)
31 	FO,	// distance of bottom margin from page top (FOoter)
32 	PL,	// distance of physical page bottom from page top (Page Length)
33 	MF,	// minimum fullness required for padding
34 	CT,	// tolerance for division into two columns
35 	WARN,	// warnings to stderr?
36 	DBG	// debugging flag
37 };
38 
39 class slug {
40 	int	serialnum;
41 	int	dp;		// offset of data for this slug in inbuf
42 	int	linenum;	// input line number (approx) for this slug
43 	short	font;		// font in effect at slug beginning
44 	short	size;		// size in effect at slug beginning
45 	short	seen;		// 0 until output
46 	short	ncol;		// number of columns (1 or 2)
47 	short	offset;		// horizontal offset for 2 columns
48   public:
49 	short	type;		// VBOX, PP, etc.
50 	short	parm;		// parameter
51 	short	base;		// "depth" of this slug (from n command)
52 	int	hpos;		// abs horizontal position
53 	int	dv;		// height of this slug above its input Vpos
54 	union {
55 		int	ht;	// "height" of this slug (from n command)
56 		int	parm2;	// second parameter, since only VBOXes have ht
57 	};
58 	friend	slug getslug(FILE *);
59 	friend	void checkout();
60 	friend	slug eofslug();
61 	void	coalesce();	// with next slug in array slugs[]
62 	void	neutralize();	// render this one a no-op
63 	void	dump();		// dump its contents for debugging
64 	char	*headstr();	// string value of text
65 	void	slugout(int);	// add the slug to the output
66 	char	*typename();	// printable slug type
67 	int	serialno()	{ return serialnum; }
68 	int	numcol()	{ return ncol; }
69 	int	lineno()	{ return linenum; }
70 };
71 
72 // functions in slug.c
73 slug	eofslug();
74 slug	getslug(FILE *);