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Represent mdoc(7) .Pp (and .sp, and some SYNOPSIS and .Rs features)
by the <p> HTML element and use the html_fillmode() mechanism
for .Bd -unfilled, just like it was done for man(7) earlier, finally
getting rid both of the horrible <div class="Pp"></div> hack and
of the worst HTML syntax violations caused by nested displays.

Care is needed because in some situations, paragraphs have to remain
open across several subsequent macros, whereas in other situations,
they must get closed together with a block containing them.

Some implementation details include:
* Always close paragraphs before emitting HTML flow content.
* Let html_close_paragraph() also close <pre> for extra safety.
* Drop the old, now unused function print_paragraph().
* Minor adjustments in the top-level man(7) node formatter for symmetry.
* Bugfix: .Ss heads suspend no-fill mode, even though .Ss doesn't end it.
* Bugfix: give up on .Op semantic markup for now, see the comment.

/*	$Id: html.h,v 1.100 2019/01/07 07:26:29 schwarze Exp $ */
/*
 * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2017, 2018, 2019 Ingo Schwarze <schwarze@openbsd.org>
 *
 * 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.
 */

enum	htmltag {
	TAG_HTML,
	TAG_HEAD,
	TAG_BODY,
	TAG_META,
	TAG_TITLE,
	TAG_DIV,
	TAG_IDIV,
	TAG_H1,
	TAG_H2,
	TAG_SPAN,
	TAG_LINK,
	TAG_BR,
	TAG_A,
	TAG_TABLE,
	TAG_TR,
	TAG_TD,
	TAG_LI,
	TAG_UL,
	TAG_OL,
	TAG_DL,
	TAG_DT,
	TAG_DD,
	TAG_P,
	TAG_PRE,
	TAG_VAR,
	TAG_CITE,
	TAG_B,
	TAG_I,
	TAG_CODE,
	TAG_SMALL,
	TAG_STYLE,
	TAG_MATH,
	TAG_MROW,
	TAG_MI,
	TAG_MN,
	TAG_MO,
	TAG_MSUP,
	TAG_MSUB,
	TAG_MSUBSUP,
	TAG_MFRAC,
	TAG_MSQRT,
	TAG_MFENCED,
	TAG_MTABLE,
	TAG_MTR,
	TAG_MTD,
	TAG_MUNDEROVER,
	TAG_MUNDER,
	TAG_MOVER,
	TAG_MAX
};

enum	htmlfont {
	HTMLFONT_NONE = 0,
	HTMLFONT_BOLD,
	HTMLFONT_ITALIC,
	HTMLFONT_BI,
	HTMLFONT_CW,
	HTMLFONT_MAX
};

struct	tag {
	struct tag	 *next;
	enum htmltag	  tag;
};

struct	html {
	int		  flags;
#define	HTML_NOSPACE	 (1 << 0) /* suppress next space */
#define	HTML_IGNDELIM	 (1 << 1)
#define	HTML_KEEP	 (1 << 2)
#define	HTML_PREKEEP	 (1 << 3)
#define	HTML_NONOSPACE	 (1 << 4) /* never add spaces */
#define	HTML_SKIPCHAR	 (1 << 6) /* skip the next character */
#define	HTML_NOSPLIT	 (1 << 7) /* do not break line before .An */
#define	HTML_SPLIT	 (1 << 8) /* break line before .An */
#define	HTML_NONEWLINE	 (1 << 9) /* No line break in nofill mode. */
#define	HTML_BUFFER	 (1 << 10) /* Collect a word to see if it fits. */
#define	HTML_TOCDONE	 (1 << 11) /* The TOC was already written. */
	size_t		  indent; /* current output indentation level */
	int		  noindent; /* indent disabled by <pre> */
	size_t		  col; /* current output byte position */
	size_t		  bufcol; /* current buf byte position */
	char		  buf[80]; /* output buffer */
	struct tag	 *tag; /* last open tag */
	struct rofftbl	  tbl; /* current table */
	struct tag	 *tblt; /* current open table scope */
	char		 *base_man1; /* bases for manpage href */
	char		 *base_man2;
	char		 *base_includes; /* base for include href */
	char		 *style; /* style-sheet URI */
	struct tag	 *metaf; /* current open font scope */
	enum htmlfont	  metal; /* last used font */
	enum htmlfont	  metac; /* current font mode */
	int		  oflags; /* output options */
#define	HTML_FRAGMENT	 (1 << 0) /* don't emit HTML/HEAD/BODY */
#define	HTML_TOC	 (1 << 1) /* emit a table of contents */
};


struct	roff_node;
struct	tbl_span;
struct	eqn_box;

void		  roff_html_pre(struct html *, const struct roff_node *);

void		  print_gen_comment(struct html *, struct roff_node *);
void		  print_gen_decls(struct html *);
void		  print_gen_head(struct html *);
void		  print_metaf(struct html *, enum mandoc_esc);
struct tag	 *print_otag(struct html *, enum htmltag, const char *, ...);
void		  print_tagq(struct html *, const struct tag *);
void		  print_stagq(struct html *, const struct tag *);
void		  print_text(struct html *, const char *);
void		  print_tblclose(struct html *);
void		  print_tbl(struct html *, const struct tbl_span *);
void		  print_eqn(struct html *, const struct eqn_box *);
void		  print_endline(struct html *);

void		  html_close_paragraph(struct html *);
enum roff_tok	  html_fillmode(struct html *, enum roff_tok);
char		 *html_make_id(const struct roff_node *, int);