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Initial chunks for variable-width fonts.  Pushes all width calculations
in mdoc_term.c and man_term.c down into term.c.  This is still not
implemented in term.c, although stubs for width calculations are in
place.  From now on, offset, rmargin, and other layout variables are
abstract screen widths.  They will resolve to the the familiar values
for -Tascii but -Tps will eventually use points instead of chars.

/*	$Id: term.h,v 1.65 2010/06/25 18:53:14 kristaps Exp $ */
/*
 * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@bsd.lv>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#ifndef TERM_H
#define TERM_H

__BEGIN_DECLS

struct	termp;

enum	termenc {
	TERMENC_ASCII
};

enum	termtype {
	TERMTYPE_CHAR,
	TERMTYPE_PS
};

enum	termfont {
	TERMFONT_NONE = 0,
	TERMFONT_BOLD,
	TERMFONT_UNDER
};

#define	TERM_MAXMARGIN	  100000 /* FIXME */

typedef void	(*term_margin)(struct termp *, const void *);

struct	termp_ps {
	int		  psstate;	/* state of ps output */
#define	PS_INLINE	 (1 << 0)	/* we're in a word */
#define	PS_MARGINS	 (1 << 1)	/* we're in the margins */
	size_t		  pscol;	/* visible column */
	size_t		  psrow;	/* visible row */
	char		 *psmarg;	/* margin buf */
	size_t		  psmargsz;	/* margin buf size */
	size_t		  psmargcur;	/* current pos in margin buf */
	size_t	 	  pspage;	/* current page */
	char		  last;		/* character buffer */
	enum termfont	  lastf;	/* last set font */
};

struct	termp {
	enum termtype	  type;
	size_t		  defrmargin;	/* Right margin of the device.. */
	size_t		  rmargin;	/* Current right margin. */
	size_t		  maxrmargin;	/* Max right margin. */
	size_t		  maxcols;	/* Max size of buf. */
	size_t		  offset;	/* Margin offest. */
	size_t		  tabwidth;	/* Distance of tab positions. */
	size_t		  col;		/* Bytes in buf. */
	size_t		  viscol;	/* Chars on current line. */
	int		  overstep;	/* See termp_flushln(). */
	int		  flags;
#define	TERMP_SENTENCE	 (1 << 1)	/* Space before a sentence. */
#define	TERMP_NOSPACE	 (1 << 2)	/* No space before words. */
#define	TERMP_NOLPAD	 (1 << 3)	/* See term_flushln(). */
#define	TERMP_NOBREAK	 (1 << 4)	/* See term_flushln(). */
#define	TERMP_IGNDELIM	 (1 << 6)	/* Delims like regulars. */
#define	TERMP_NONOSPACE	 (1 << 7)	/* No space (no autounset). */
#define	TERMP_DANGLE	 (1 << 8)	/* See term_flushln(). */
#define	TERMP_HANG	 (1 << 9)	/* See term_flushln(). */
#define	TERMP_TWOSPACE	 (1 << 10)	/* See term_flushln(). */
#define	TERMP_NOSPLIT	 (1 << 11)	/* See termp_an_pre/post(). */
#define	TERMP_SPLIT	 (1 << 12)	/* See termp_an_pre/post(). */
#define	TERMP_ANPREC	 (1 << 13)	/* See termp_an_pre(). */
	char		 *buf;		/* Output buffer. */
	enum termenc	  enc;		/* Type of encoding. */
	void		 *symtab;	/* Encoded-symbol table. */
	enum termfont	  fontl;	/* Last font set. */
	enum termfont	  fontq[10];	/* Symmetric fonts. */
	int		  fonti;	/* Index of font stack. */
	term_margin	  headf;	/* invoked to print head */
	term_margin	  footf;	/* invoked to print foot */
	void		(*letter)(struct termp *, char);
	void		(*begin)(struct termp *);
	void		(*end)(struct termp *);
	void		(*endline)(struct termp *);
	void		(*advance)(struct termp *, size_t);
	size_t		(*width)(const struct termp *, char);
	const void	 *argf;		/* arg for headf/footf */
	union {
		struct termp_ps ps;
	} engine;
};

struct termp	 *term_alloc(enum termenc);
void		  term_free(struct termp *);
void		  term_newln(struct termp *);
void		  term_vspace(struct termp *);
void		  term_word(struct termp *, const char *);
void		  term_flushln(struct termp *);
void		  term_begin(struct termp *, term_margin, 
			term_margin, const void *);
void		  term_end(struct termp *);

size_t		  term_hspan(const struct termp *, 
			const struct roffsu *);
size_t		  term_vspan(const struct termp *,
			const struct roffsu *);
size_t		  term_strlen(const struct termp *, const char *);
size_t		  term_len(const struct termp *, size_t);

enum termfont	  term_fonttop(struct termp *);
const void	 *term_fontq(struct termp *);
void		  term_fontpush(struct termp *, enum termfont);
void		  term_fontpop(struct termp *);
void		  term_fontpopq(struct termp *, const void *);
void		  term_fontrepl(struct termp *, enum termfont);
void		  term_fontlast(struct termp *);

__END_DECLS

#endif /*!TERM_H*/