/*	$Id$ */
/*
 * 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,
	TERMFONT__MAX
};

#define	TERM_MAXMARGIN	  100000 /* FIXME */

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

struct	termp_ps {
	int		  flags;
#define	PS_INLINE	 (1 << 0)	/* we're in a word */
#define	PS_MARGINS	 (1 << 1)	/* we're in the margins */
#define	PS_NEWPAGE	 (1 << 2)	/* new page, no words yet */
	size_t		  pscol;	/* visible column (AFM units) */
	size_t		  psrow;	/* visible row (AFM units) */
	char		 *psmarg;	/* margin buf */
	size_t		  psmargsz;	/* margin buf size */
	size_t		  psmargcur;	/* cur index in margin buf */
	char		  last;		/* character buffer */
	enum termfont	  lastf;	/* last set font */
	size_t		  scale;	/* font scaling factor */
	size_t		  pages;	/* number of pages shown */
	size_t		  lineheight;	/* line height (AFM units) */
	size_t		  top;		/* body top (AFM units) */
	size_t		  bottom;	/* body bottom (AFM units) */
	size_t		  height;	/* page height (AFM units */
	size_t		  width;	/* page width (AFM units) */
	size_t		  left;		/* body left (AFM units) */
	size_t		  header;	/* header pos (AFM units) */
	size_t		  footer;	/* footer pos (AFM units) */
};

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(). */
#define	TERMP_KEEP	 (1 << 14)	/* Keep words together. */
#define	TERMP_PREKEEP	 (1 << 15)	/* ...starting with the next one. */
	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);
	double		(*hspan)(const struct termp *,
				const struct roffsu *);
	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*/