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Revision 1.327, Fri Jan 18 14:36:21 2019 UTC (5 years, 2 months ago) by schwarze
Branch: MAIN
Changes since 1.326: +11 -8 lines

The .UR and .MT blocks in man(7) are represented by <a> elements
which establish phrasing context, but they can contain paragraph
breaks (which is relevant for terminal formatting, so we can't just
change the structure of the syntax tree), which are respresented
by <p> elements and cannot occur inside <a>.

Fix this by prematurely closing the <a> element in the HTML formatter.
This menas that the clickable text in HTML output is shorter than
what is represented as the link text in terminal output, but in
HTML, it is frankly impossible to have the clickable area of a
hyperlink extend across a paragraph break.  The difference in
presentation is not a major problem, and besides, paragraph breaks
inside .UR are rather poor style in the first place.

The implementation is quite tricky.  Naively closing out the <a>
prematurely would result in accessing a stale pointer when later
reaching the physical end of the .UR block.  So this commit separates
visual and structural closing of "struct tag" stack items.  Visual
closing means that the HTML element is closed but the "struct tag"
remains on the stack, to avoid later access to a stale pointer and
to avoid closing the same HTML element a second time later.

This also needs reference counting of pointers to "struct tag" stack
items because often more than one child holds a pointer to the same
parent item, and only the outermost child can safely do the physical
closing.

In the whole corpus of nearly half a million manual pages on
man.openbsd.org, this problem occurs in exactly one page: the
groff(1) version 1.20.1 manual contained in DragonFly-3.8.2, which
contains a formatting error triggering the bug.

/*	$Id: mdoc_html.c,v 1.327 2019/01/18 14:36:21 schwarze Exp $ */
/*
 * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2014-2019 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 AUTHORS DISCLAIM ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS 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.
 */
#include "config.h"

#include <sys/types.h>

#include <assert.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "mandoc_aux.h"
#include "mandoc.h"
#include "roff.h"
#include "mdoc.h"
#include "out.h"
#include "html.h"
#include "main.h"

#define	MDOC_ARGS	  const struct roff_meta *meta, \
			  struct roff_node *n, \
			  struct html *h

#ifndef MIN
#define	MIN(a,b)	((/*CONSTCOND*/(a)<(b))?(a):(b))
#endif

struct	mdoc_html_act {
	int		(*pre)(MDOC_ARGS);
	void		(*post)(MDOC_ARGS);
};

static	char		 *cond_id(const struct roff_node *);
static	void		  print_mdoc_head(const struct roff_meta *,
				struct html *);
static	void		  print_mdoc_node(MDOC_ARGS);
static	void		  print_mdoc_nodelist(MDOC_ARGS);
static	void		  synopsis_pre(struct html *,
				const struct roff_node *);

static	void		  mdoc_root_post(const struct roff_meta *,
				struct html *);
static	int		  mdoc_root_pre(const struct roff_meta *,
				struct html *);

static	void		  mdoc__x_post(MDOC_ARGS);
static	int		  mdoc__x_pre(MDOC_ARGS);
static	int		  mdoc_abort_pre(MDOC_ARGS);
static	int		  mdoc_ad_pre(MDOC_ARGS);
static	int		  mdoc_an_pre(MDOC_ARGS);
static	int		  mdoc_ap_pre(MDOC_ARGS);
static	int		  mdoc_ar_pre(MDOC_ARGS);
static	int		  mdoc_bd_pre(MDOC_ARGS);
static	int		  mdoc_bf_pre(MDOC_ARGS);
static	void		  mdoc_bk_post(MDOC_ARGS);
static	int		  mdoc_bk_pre(MDOC_ARGS);
static	int		  mdoc_bl_pre(MDOC_ARGS);
static	int		  mdoc_cd_pre(MDOC_ARGS);
static	int		  mdoc_cm_pre(MDOC_ARGS);
static	int		  mdoc_d1_pre(MDOC_ARGS);
static	int		  mdoc_dv_pre(MDOC_ARGS);
static	int		  mdoc_fa_pre(MDOC_ARGS);
static	int		  mdoc_fd_pre(MDOC_ARGS);
static	int		  mdoc_fl_pre(MDOC_ARGS);
static	int		  mdoc_fn_pre(MDOC_ARGS);
static	int		  mdoc_ft_pre(MDOC_ARGS);
static	int		  mdoc_em_pre(MDOC_ARGS);
static	void		  mdoc_eo_post(MDOC_ARGS);
static	int		  mdoc_eo_pre(MDOC_ARGS);
static	int		  mdoc_er_pre(MDOC_ARGS);
static	int		  mdoc_ev_pre(MDOC_ARGS);
static	int		  mdoc_ex_pre(MDOC_ARGS);
static	void		  mdoc_fo_post(MDOC_ARGS);
static	int		  mdoc_fo_pre(MDOC_ARGS);
static	int		  mdoc_ic_pre(MDOC_ARGS);
static	int		  mdoc_igndelim_pre(MDOC_ARGS);
static	int		  mdoc_in_pre(MDOC_ARGS);
static	int		  mdoc_it_pre(MDOC_ARGS);
static	int		  mdoc_lb_pre(MDOC_ARGS);
static	int		  mdoc_li_pre(MDOC_ARGS);
static	int		  mdoc_lk_pre(MDOC_ARGS);
static	int		  mdoc_mt_pre(MDOC_ARGS);
static	int		  mdoc_ms_pre(MDOC_ARGS);
static	int		  mdoc_nd_pre(MDOC_ARGS);
static	int		  mdoc_nm_pre(MDOC_ARGS);
static	int		  mdoc_no_pre(MDOC_ARGS);
static	int		  mdoc_ns_pre(MDOC_ARGS);
static	int		  mdoc_pa_pre(MDOC_ARGS);
static	void		  mdoc_pf_post(MDOC_ARGS);
static	int		  mdoc_pp_pre(MDOC_ARGS);
static	void		  mdoc_quote_post(MDOC_ARGS);
static	int		  mdoc_quote_pre(MDOC_ARGS);
static	int		  mdoc_rs_pre(MDOC_ARGS);
static	int		  mdoc_sh_pre(MDOC_ARGS);
static	int		  mdoc_skip_pre(MDOC_ARGS);
static	int		  mdoc_sm_pre(MDOC_ARGS);
static	int		  mdoc_ss_pre(MDOC_ARGS);
static	int		  mdoc_st_pre(MDOC_ARGS);
static	int		  mdoc_sx_pre(MDOC_ARGS);
static	int		  mdoc_sy_pre(MDOC_ARGS);
static	int		  mdoc_va_pre(MDOC_ARGS);
static	int		  mdoc_vt_pre(MDOC_ARGS);
static	int		  mdoc_xr_pre(MDOC_ARGS);
static	int		  mdoc_xx_pre(MDOC_ARGS);

static const struct mdoc_html_act mdoc_html_acts[MDOC_MAX - MDOC_Dd] = {
	{NULL, NULL}, /* Dd */
	{NULL, NULL}, /* Dt */
	{NULL, NULL}, /* Os */
	{mdoc_sh_pre, NULL }, /* Sh */
	{mdoc_ss_pre, NULL }, /* Ss */
	{mdoc_pp_pre, NULL}, /* Pp */
	{mdoc_d1_pre, NULL}, /* D1 */
	{mdoc_d1_pre, NULL}, /* Dl */
	{mdoc_bd_pre, NULL}, /* Bd */
	{NULL, NULL}, /* Ed */
	{mdoc_bl_pre, NULL}, /* Bl */
	{NULL, NULL}, /* El */
	{mdoc_it_pre, NULL}, /* It */
	{mdoc_ad_pre, NULL}, /* Ad */
	{mdoc_an_pre, NULL}, /* An */
	{mdoc_ap_pre, NULL}, /* Ap */
	{mdoc_ar_pre, NULL}, /* Ar */
	{mdoc_cd_pre, NULL}, /* Cd */
	{mdoc_cm_pre, NULL}, /* Cm */
	{mdoc_dv_pre, NULL}, /* Dv */
	{mdoc_er_pre, NULL}, /* Er */
	{mdoc_ev_pre, NULL}, /* Ev */
	{mdoc_ex_pre, NULL}, /* Ex */
	{mdoc_fa_pre, NULL}, /* Fa */
	{mdoc_fd_pre, NULL}, /* Fd */
	{mdoc_fl_pre, NULL}, /* Fl */
	{mdoc_fn_pre, NULL}, /* Fn */
	{mdoc_ft_pre, NULL}, /* Ft */
	{mdoc_ic_pre, NULL}, /* Ic */
	{mdoc_in_pre, NULL}, /* In */
	{mdoc_li_pre, NULL}, /* Li */
	{mdoc_nd_pre, NULL}, /* Nd */
	{mdoc_nm_pre, NULL}, /* Nm */
	{mdoc_quote_pre, mdoc_quote_post}, /* Op */
	{mdoc_abort_pre, NULL}, /* Ot */
	{mdoc_pa_pre, NULL}, /* Pa */
	{mdoc_ex_pre, NULL}, /* Rv */
	{mdoc_st_pre, NULL}, /* St */
	{mdoc_va_pre, NULL}, /* Va */
	{mdoc_vt_pre, NULL}, /* Vt */
	{mdoc_xr_pre, NULL}, /* Xr */
	{mdoc__x_pre, mdoc__x_post}, /* %A */
	{mdoc__x_pre, mdoc__x_post}, /* %B */
	{mdoc__x_pre, mdoc__x_post}, /* %D */
	{mdoc__x_pre, mdoc__x_post}, /* %I */
	{mdoc__x_pre, mdoc__x_post}, /* %J */
	{mdoc__x_pre, mdoc__x_post}, /* %N */
	{mdoc__x_pre, mdoc__x_post}, /* %O */
	{mdoc__x_pre, mdoc__x_post}, /* %P */
	{mdoc__x_pre, mdoc__x_post}, /* %R */
	{mdoc__x_pre, mdoc__x_post}, /* %T */
	{mdoc__x_pre, mdoc__x_post}, /* %V */
	{NULL, NULL}, /* Ac */
	{mdoc_quote_pre, mdoc_quote_post}, /* Ao */
	{mdoc_quote_pre, mdoc_quote_post}, /* Aq */
	{mdoc_xx_pre, NULL}, /* At */
	{NULL, NULL}, /* Bc */
	{mdoc_bf_pre, NULL}, /* Bf */
	{mdoc_quote_pre, mdoc_quote_post}, /* Bo */
	{mdoc_quote_pre, mdoc_quote_post}, /* Bq */
	{mdoc_xx_pre, NULL}, /* Bsx */
	{mdoc_xx_pre, NULL}, /* Bx */
	{mdoc_skip_pre, NULL}, /* Db */
	{NULL, NULL}, /* Dc */
	{mdoc_quote_pre, mdoc_quote_post}, /* Do */
	{mdoc_quote_pre, mdoc_quote_post}, /* Dq */
	{NULL, NULL}, /* Ec */ /* FIXME: no space */
	{NULL, NULL}, /* Ef */
	{mdoc_em_pre, NULL}, /* Em */
	{mdoc_eo_pre, mdoc_eo_post}, /* Eo */
	{mdoc_xx_pre, NULL}, /* Fx */
	{mdoc_ms_pre, NULL}, /* Ms */
	{mdoc_no_pre, NULL}, /* No */
	{mdoc_ns_pre, NULL}, /* Ns */
	{mdoc_xx_pre, NULL}, /* Nx */
	{mdoc_xx_pre, NULL}, /* Ox */
	{NULL, NULL}, /* Pc */
	{mdoc_igndelim_pre, mdoc_pf_post}, /* Pf */
	{mdoc_quote_pre, mdoc_quote_post}, /* Po */
	{mdoc_quote_pre, mdoc_quote_post}, /* Pq */
	{NULL, NULL}, /* Qc */
	{mdoc_quote_pre, mdoc_quote_post}, /* Ql */
	{mdoc_quote_pre, mdoc_quote_post}, /* Qo */
	{mdoc_quote_pre, mdoc_quote_post}, /* Qq */
	{NULL, NULL}, /* Re */
	{mdoc_rs_pre, NULL}, /* Rs */
	{NULL, NULL}, /* Sc */
	{mdoc_quote_pre, mdoc_quote_post}, /* So */
	{mdoc_quote_pre, mdoc_quote_post}, /* Sq */
	{mdoc_sm_pre, NULL}, /* Sm */
	{mdoc_sx_pre, NULL}, /* Sx */
	{mdoc_sy_pre, NULL}, /* Sy */
	{NULL, NULL}, /* Tn */
	{mdoc_xx_pre, NULL}, /* Ux */
	{NULL, NULL}, /* Xc */
	{NULL, NULL}, /* Xo */
	{mdoc_fo_pre, mdoc_fo_post}, /* Fo */
	{NULL, NULL}, /* Fc */
	{mdoc_quote_pre, mdoc_quote_post}, /* Oo */
	{NULL, NULL}, /* Oc */
	{mdoc_bk_pre, mdoc_bk_post}, /* Bk */
	{NULL, NULL}, /* Ek */
	{NULL, NULL}, /* Bt */
	{NULL, NULL}, /* Hf */
	{mdoc_em_pre, NULL}, /* Fr */
	{NULL, NULL}, /* Ud */
	{mdoc_lb_pre, NULL}, /* Lb */
	{mdoc_abort_pre, NULL}, /* Lp */
	{mdoc_lk_pre, NULL}, /* Lk */
	{mdoc_mt_pre, NULL}, /* Mt */
	{mdoc_quote_pre, mdoc_quote_post}, /* Brq */
	{mdoc_quote_pre, mdoc_quote_post}, /* Bro */
	{NULL, NULL}, /* Brc */
	{mdoc__x_pre, mdoc__x_post}, /* %C */
	{mdoc_skip_pre, NULL}, /* Es */
	{mdoc_quote_pre, mdoc_quote_post}, /* En */
	{mdoc_xx_pre, NULL}, /* Dx */
	{mdoc__x_pre, mdoc__x_post}, /* %Q */
	{mdoc__x_pre, mdoc__x_post}, /* %U */
	{NULL, NULL}, /* Ta */
};


/*
 * See the same function in mdoc_term.c for documentation.
 */
static void
synopsis_pre(struct html *h, const struct roff_node *n)
{

	if (NULL == n->prev || ! (NODE_SYNPRETTY & n->flags))
		return;

	if (n->prev->tok == n->tok &&
	    MDOC_Fo != n->tok &&
	    MDOC_Ft != n->tok &&
	    MDOC_Fn != n->tok) {
		print_otag(h, TAG_BR, "");
		return;
	}

	switch (n->prev->tok) {
	case MDOC_Fd:
	case MDOC_Fn:
	case MDOC_Fo:
	case MDOC_In:
	case MDOC_Vt:
		break;
	case MDOC_Ft:
		if (n->tok != MDOC_Fn && n->tok != MDOC_Fo)
			break;
		/* FALLTHROUGH */
	default:
		print_otag(h, TAG_BR, "");
		return;
	}
	html_close_paragraph(h);
	print_otag(h, TAG_P, "c", "Pp");
}

void
html_mdoc(void *arg, const struct roff_meta *mdoc)
{
	struct html		*h;
	struct roff_node	*n;
	struct tag		*t;

	h = (struct html *)arg;
	n = mdoc->first->child;

	if ((h->oflags & HTML_FRAGMENT) == 0) {
		print_gen_decls(h);
		print_otag(h, TAG_HTML, "");
		if (n != NULL && n->type == ROFFT_COMMENT)
			print_gen_comment(h, n);
		t = print_otag(h, TAG_HEAD, "");
		print_mdoc_head(mdoc, h);
		print_tagq(h, t);
		print_otag(h, TAG_BODY, "");
	}

	mdoc_root_pre(mdoc, h);
	t = print_otag(h, TAG_DIV, "c", "manual-text");
	print_mdoc_nodelist(mdoc, n, h);
	print_tagq(h, t);
	mdoc_root_post(mdoc, h);
	print_tagq(h, NULL);
}

static void
print_mdoc_head(const struct roff_meta *meta, struct html *h)
{
	char	*cp;

	print_gen_head(h);

	if (meta->arch != NULL && meta->msec != NULL)
		mandoc_asprintf(&cp, "%s(%s) (%s)", meta->title,
		    meta->msec, meta->arch);
	else if (meta->msec != NULL)
		mandoc_asprintf(&cp, "%s(%s)", meta->title, meta->msec);
	else if (meta->arch != NULL)
		mandoc_asprintf(&cp, "%s (%s)", meta->title, meta->arch);
	else
		cp = mandoc_strdup(meta->title);

	print_otag(h, TAG_TITLE, "");
	print_text(h, cp);
	free(cp);
}

static void
print_mdoc_nodelist(MDOC_ARGS)
{

	while (n != NULL) {
		print_mdoc_node(meta, n, h);
		n = n->next;
	}
}

static void
print_mdoc_node(MDOC_ARGS)
{
	struct tag	*t;
	int		 child;

	if (n->type == ROFFT_COMMENT || n->flags & NODE_NOPRT)
		return;

	html_fillmode(h, n->flags & NODE_NOFILL ? ROFF_nf : ROFF_fi);

	child = 1;
	n->flags &= ~NODE_ENDED;
	switch (n->type) {
	case ROFFT_TEXT:
		t = h->tag;
		t->refcnt++;

		/* No tables in this mode... */
		assert(NULL == h->tblt);

		/*
		 * Make sure that if we're in a literal mode already
		 * (i.e., within a <PRE>) don't print the newline.
		 */
		if (*n->string == ' ' && n->flags & NODE_LINE &&
		    (h->flags & HTML_NONEWLINE) == 0 &&
		    (n->flags & NODE_NOFILL) == 0)
			print_otag(h, TAG_BR, "");
		if (NODE_DELIMC & n->flags)
			h->flags |= HTML_NOSPACE;
		print_text(h, n->string);
		if (NODE_DELIMO & n->flags)
			h->flags |= HTML_NOSPACE;
		break;
	case ROFFT_EQN:
		t = h->tag;
		t->refcnt++;
		print_eqn(h, n->eqn);
		break;
	case ROFFT_TBL:
		/*
		 * This will take care of initialising all of the table
		 * state data for the first table, then tearing it down
		 * for the last one.
		 */
		print_tbl(h, n->span);
		return;
	default:
		/*
		 * Close out the current table, if it's open, and unset
		 * the "meta" table state.  This will be reopened on the
		 * next table element.
		 */
		if (h->tblt != NULL)
			print_tblclose(h);
		assert(h->tblt == NULL);
		t = h->tag;
		t->refcnt++;
		if (n->tok < ROFF_MAX) {
			roff_html_pre(h, n);
			t->refcnt--;
			print_stagq(h, t);
			return;
		}
		assert(n->tok >= MDOC_Dd && n->tok < MDOC_MAX);
		if (mdoc_html_acts[n->tok - MDOC_Dd].pre != NULL &&
		    (n->end == ENDBODY_NOT || n->child != NULL))
			child = (*mdoc_html_acts[n->tok - MDOC_Dd].pre)(meta,
			    n, h);
		break;
	}

	if (h->flags & HTML_KEEP && n->flags & NODE_LINE) {
		h->flags &= ~HTML_KEEP;
		h->flags |= HTML_PREKEEP;
	}

	if (child && n->child != NULL)
		print_mdoc_nodelist(meta, n->child, h);

	t->refcnt--;
	print_stagq(h, t);

	switch (n->type) {
	case ROFFT_TEXT:
	case ROFFT_EQN:
		break;
	default:
		if (mdoc_html_acts[n->tok - MDOC_Dd].post == NULL ||
		    n->flags & NODE_ENDED)
			break;
		(*mdoc_html_acts[n->tok - MDOC_Dd].post)(meta, n, h);
		if (n->end != ENDBODY_NOT)
			n->body->flags |= NODE_ENDED;
		break;
	}

	if (n->flags & NODE_NOFILL &&
	    (n->next == NULL || n->next->flags & NODE_LINE)) {
		h->col++;
		print_endline(h);
	}
}

static void
mdoc_root_post(const struct roff_meta *meta, struct html *h)
{
	struct tag	*t, *tt;

	t = print_otag(h, TAG_TABLE, "c", "foot");
	tt = print_otag(h, TAG_TR, "");

	print_otag(h, TAG_TD, "c", "foot-date");
	print_text(h, meta->date);
	print_stagq(h, tt);

	print_otag(h, TAG_TD, "c", "foot-os");
	print_text(h, meta->os);
	print_tagq(h, t);
}

static int
mdoc_root_pre(const struct roff_meta *meta, struct html *h)
{
	struct tag	*t, *tt;
	char		*volume, *title;

	if (NULL == meta->arch)
		volume = mandoc_strdup(meta->vol);
	else
		mandoc_asprintf(&volume, "%s (%s)",
		    meta->vol, meta->arch);

	if (NULL == meta->msec)
		title = mandoc_strdup(meta->title);
	else
		mandoc_asprintf(&title, "%s(%s)",
		    meta->title, meta->msec);

	t = print_otag(h, TAG_TABLE, "c", "head");
	tt = print_otag(h, TAG_TR, "");

	print_otag(h, TAG_TD, "c", "head-ltitle");
	print_text(h, title);
	print_stagq(h, tt);

	print_otag(h, TAG_TD, "c", "head-vol");
	print_text(h, volume);
	print_stagq(h, tt);

	print_otag(h, TAG_TD, "c", "head-rtitle");
	print_text(h, title);
	print_tagq(h, t);

	free(title);
	free(volume);
	return 1;
}

static char *
cond_id(const struct roff_node *n)
{
	if (n->child != NULL &&
	    n->child->type == ROFFT_TEXT &&
	    (n->prev == NULL ||
	     (n->prev->type == ROFFT_TEXT &&
	      strcmp(n->prev->string, "|") == 0)) &&
	    (n->parent->tok == MDOC_It ||
	     (n->parent->tok == MDOC_Xo &&
	      n->parent->parent->prev == NULL &&
	      n->parent->parent->parent->tok == MDOC_It)))
		return html_make_id(n, 1);
	return NULL;
}

static int
mdoc_sh_pre(MDOC_ARGS)
{
	struct roff_node	*sn, *subn;
	struct tag		*t, *tsec, *tsub;
	char			*id;
	int			 sc;

	switch (n->type) {
	case ROFFT_BLOCK:
		html_close_paragraph(h);
		if ((h->oflags & HTML_TOC) == 0 ||
		    h->flags & HTML_TOCDONE ||
		    n->sec <= SEC_SYNOPSIS)
			break;
		h->flags |= HTML_TOCDONE;
		sc = 0;
		for (sn = n->next; sn != NULL; sn = sn->next)
			if (sn->sec == SEC_CUSTOM)
				if (++sc == 2)
					break;
		if (sc < 2)
			break;
		t = print_otag(h, TAG_H1, "c", "Sh");
		print_text(h, "TABLE OF CONTENTS");
		print_tagq(h, t);
		t = print_otag(h, TAG_UL, "c", "Bl-compact");
		for (sn = n; sn != NULL; sn = sn->next) {
			tsec = print_otag(h, TAG_LI, "");
			id = html_make_id(sn->head, 0);
			tsub = print_otag(h, TAG_A, "hR", id);
			free(id);
			print_mdoc_nodelist(meta, sn->head->child, h);
			print_tagq(h, tsub);
			tsub = NULL;
			for (subn = sn->body->child; subn != NULL;
			    subn = subn->next) {
				if (subn->tok != MDOC_Ss)
					continue;
				id = html_make_id(subn->head, 0);
				if (id == NULL)
					continue;
				if (tsub == NULL)
					print_otag(h, TAG_UL,
					    "c", "Bl-compact");
				tsub = print_otag(h, TAG_LI, "");
				print_otag(h, TAG_A, "hR", id);
				free(id);
				print_mdoc_nodelist(meta,
				    subn->head->child, h);
				print_tagq(h, tsub);
			}
			print_tagq(h, tsec);
		}
		print_tagq(h, t);
		break;
	case ROFFT_HEAD:
		id = html_make_id(n, 1);
		print_otag(h, TAG_H1, "ci", "Sh", id);
		if (id != NULL)
			print_otag(h, TAG_A, "chR", "permalink", id);
		break;
	case ROFFT_BODY:
		if (n->sec == SEC_AUTHORS)
			h->flags &= ~(HTML_SPLIT|HTML_NOSPLIT);
		break;
	default:
		break;
	}
	return 1;
}

static int
mdoc_ss_pre(MDOC_ARGS)
{
	char	*id;

	switch (n->type) {
	case ROFFT_BLOCK:
		html_close_paragraph(h);
		return 1;
	case ROFFT_HEAD:
		break;
	case ROFFT_BODY:
		return 1;
	default:
		abort();
	}

	id = html_make_id(n, 1);
	print_otag(h, TAG_H2, "ci", "Ss", id);
	if (id != NULL)
		print_otag(h, TAG_A, "chR", "permalink", id);
	return 1;
}

static int
mdoc_fl_pre(MDOC_ARGS)
{
	char	*id;

	if ((id = cond_id(n)) != NULL)
		print_otag(h, TAG_A, "chR", "permalink", id);
	print_otag(h, TAG_CODE, "ci", "Fl", id);

	print_text(h, "\\-");
	if (!(n->child == NULL &&
	    (n->next == NULL ||
	     n->next->type == ROFFT_TEXT ||
	     n->next->flags & NODE_LINE)))
		h->flags |= HTML_NOSPACE;

	return 1;
}

static int
mdoc_cm_pre(MDOC_ARGS)
{
	char	*id;

	if ((id = cond_id(n)) != NULL)
		print_otag(h, TAG_A, "chR", "permalink", id);
	print_otag(h, TAG_CODE, "ci", "Cm", id);
	return 1;
}

static int
mdoc_nd_pre(MDOC_ARGS)
{
	switch (n->type) {
	case ROFFT_BLOCK:
		html_close_paragraph(h);
		return 1;
	case ROFFT_HEAD:
		return 0;
	case ROFFT_BODY:
		break;
	default:
		abort();
	}
	print_text(h, "\\(em");
	/* Cannot use TAG_SPAN because it may contain blocks. */
	print_otag(h, TAG_DIV, "c", "Nd");
	return 1;
}

static int
mdoc_nm_pre(MDOC_ARGS)
{
	switch (n->type) {
	case ROFFT_BLOCK:
		break;
	case ROFFT_HEAD:
		print_otag(h, TAG_TD, "");
		/* FALLTHROUGH */
	case ROFFT_ELEM:
		print_otag(h, TAG_CODE, "c", "Nm");
		return 1;
	case ROFFT_BODY:
		print_otag(h, TAG_TD, "");
		return 1;
	default:
		abort();
	}
	html_close_paragraph(h);
	synopsis_pre(h, n);
	print_otag(h, TAG_TABLE, "c", "Nm");
	print_otag(h, TAG_TR, "");
	return 1;
}

static int
mdoc_xr_pre(MDOC_ARGS)
{
	if (NULL == n->child)
		return 0;

	if (h->base_man1)
		print_otag(h, TAG_A, "chM", "Xr",
		    n->child->string, n->child->next == NULL ?
		    NULL : n->child->next->string);
	else
		print_otag(h, TAG_A, "c", "Xr");

	n = n->child;
	print_text(h, n->string);

	if (NULL == (n = n->next))
		return 0;

	h->flags |= HTML_NOSPACE;
	print_text(h, "(");
	h->flags |= HTML_NOSPACE;
	print_text(h, n->string);
	h->flags |= HTML_NOSPACE;
	print_text(h, ")");
	return 0;
}

static int
mdoc_ns_pre(MDOC_ARGS)
{

	if ( ! (NODE_LINE & n->flags))
		h->flags |= HTML_NOSPACE;
	return 1;
}

static int
mdoc_ar_pre(MDOC_ARGS)
{
	print_otag(h, TAG_VAR, "c", "Ar");
	return 1;
}

static int
mdoc_xx_pre(MDOC_ARGS)
{
	print_otag(h, TAG_SPAN, "c", "Ux");
	return 1;
}

static int
mdoc_it_pre(MDOC_ARGS)
{
	const struct roff_node	*bl;
	enum mdoc_list		 type;

	bl = n->parent;
	while (bl->tok != MDOC_Bl)
		bl = bl->parent;
	type = bl->norm->Bl.type;

	switch (type) {
	case LIST_bullet:
	case LIST_dash:
	case LIST_hyphen:
	case LIST_item:
	case LIST_enum:
		switch (n->type) {
		case ROFFT_HEAD:
			return 0;
		case ROFFT_BODY:
			print_otag(h, TAG_LI, "");
			break;
		default:
			break;
		}
		break;
	case LIST_diag:
	case LIST_hang:
	case LIST_inset:
	case LIST_ohang:
		switch (n->type) {
		case ROFFT_HEAD:
			print_otag(h, TAG_DT, "");
			break;
		case ROFFT_BODY:
			print_otag(h, TAG_DD, "");
			break;
		default:
			break;
		}
		break;
	case LIST_tag:
		switch (n->type) {
		case ROFFT_HEAD:
			print_otag(h, TAG_DT, "");
			break;
		case ROFFT_BODY:
			if (n->child == NULL) {
				print_otag(h, TAG_DD, "s", "width", "auto");
				print_text(h, "\\ ");
			} else
				print_otag(h, TAG_DD, "");
			break;
		default:
			break;
		}
		break;
	case LIST_column:
		switch (n->type) {
		case ROFFT_HEAD:
			break;
		case ROFFT_BODY:
			print_otag(h, TAG_TD, "");
			break;
		default:
			print_otag(h, TAG_TR, "");
		}
	default:
		break;
	}

	return 1;
}

static int
mdoc_bl_pre(MDOC_ARGS)
{
	char		 cattr[32];
	struct mdoc_bl	*bl;
	enum htmltag	 elemtype;

	switch (n->type) {
	case ROFFT_BLOCK:
		html_close_paragraph(h);
		break;
	case ROFFT_HEAD:
		return 0;
	case ROFFT_BODY:
		return 1;
	default:
		abort();
	}

	bl = &n->norm->Bl;
	switch (bl->type) {
	case LIST_bullet:
		elemtype = TAG_UL;
		(void)strlcpy(cattr, "Bl-bullet", sizeof(cattr));
		break;
	case LIST_dash:
	case LIST_hyphen:
		elemtype = TAG_UL;
		(void)strlcpy(cattr, "Bl-dash", sizeof(cattr));
		break;
	case LIST_item:
		elemtype = TAG_UL;
		(void)strlcpy(cattr, "Bl-item", sizeof(cattr));
		break;
	case LIST_enum:
		elemtype = TAG_OL;
		(void)strlcpy(cattr, "Bl-enum", sizeof(cattr));
		break;
	case LIST_diag:
		elemtype = TAG_DL;
		(void)strlcpy(cattr, "Bl-diag", sizeof(cattr));
		break;
	case LIST_hang:
		elemtype = TAG_DL;
		(void)strlcpy(cattr, "Bl-hang", sizeof(cattr));
		break;
	case LIST_inset:
		elemtype = TAG_DL;
		(void)strlcpy(cattr, "Bl-inset", sizeof(cattr));
		break;
	case LIST_ohang:
		elemtype = TAG_DL;
		(void)strlcpy(cattr, "Bl-ohang", sizeof(cattr));
		break;
	case LIST_tag:
		if (bl->offs)
			print_otag(h, TAG_DIV, "c", "Bd-indent");
		print_otag(h, TAG_DL, "c", bl->comp ?
		    "Bl-tag Bl-compact" : "Bl-tag");
		return 1;
	case LIST_column:
		elemtype = TAG_TABLE;
		(void)strlcpy(cattr, "Bl-column", sizeof(cattr));
		break;
	default:
		abort();
	}
	if (bl->offs != NULL)
		(void)strlcat(cattr, " Bd-indent", sizeof(cattr));
	if (bl->comp)
		(void)strlcat(cattr, " Bl-compact", sizeof(cattr));
	print_otag(h, elemtype, "c", cattr);
	return 1;
}

static int
mdoc_ex_pre(MDOC_ARGS)
{
	if (n->prev)
		print_otag(h, TAG_BR, "");
	return 1;
}

static int
mdoc_st_pre(MDOC_ARGS)
{
	print_otag(h, TAG_SPAN, "c", "St");
	return 1;
}

static int
mdoc_em_pre(MDOC_ARGS)
{
	print_otag(h, TAG_I, "c", "Em");
	return 1;
}

static int
mdoc_d1_pre(MDOC_ARGS)
{
	switch (n->type) {
	case ROFFT_BLOCK:
		html_close_paragraph(h);
		break;
	case ROFFT_HEAD:
		return 0;
	case ROFFT_BODY:
		return 1;
	default:
		abort();
	}
	print_otag(h, TAG_DIV, "c", "Bd Bd-indent");
	if (n->tok == MDOC_Dl)
		print_otag(h, TAG_CODE, "c", "Li");
	return 1;
}

static int
mdoc_sx_pre(MDOC_ARGS)
{
	char	*id;

	id = html_make_id(n, 0);
	print_otag(h, TAG_A, "chR", "Sx", id);
	free(id);
	return 1;
}

static int
mdoc_bd_pre(MDOC_ARGS)
{
	char			 buf[16];
	struct roff_node	*nn;
	int			 comp;

	switch (n->type) {
	case ROFFT_BLOCK:
		html_close_paragraph(h);
		return 1;
	case ROFFT_HEAD:
		return 0;
	case ROFFT_BODY:
		break;
	default:
		abort();
	}

	/* Handle preceding whitespace. */

	comp = n->norm->Bd.comp;
	for (nn = n; nn != NULL && comp == 0; nn = nn->parent) {
		if (nn->type != ROFFT_BLOCK)
			continue;
		if (nn->tok == MDOC_Sh || nn->tok == MDOC_Ss)
			comp = 1;
		if (nn->prev != NULL)
			break;
	}
	(void)strlcpy(buf, "Bd", sizeof(buf));
	if (comp == 0)
		(void)strlcat(buf, " Pp", sizeof(buf));

	/* Handle the -offset argument. */

	if (n->norm->Bd.offs != NULL &&
	    strcmp(n->norm->Bd.offs, "left") != 0)
		(void)strlcat(buf, " Bd-indent", sizeof(buf));

	print_otag(h, TAG_DIV, "c", buf);
	return 1;
}

static int
mdoc_pa_pre(MDOC_ARGS)
{
	print_otag(h, TAG_SPAN, "c", "Pa");
	return 1;
}

static int
mdoc_ad_pre(MDOC_ARGS)
{
	print_otag(h, TAG_SPAN, "c", "Ad");
	return 1;
}

static int
mdoc_an_pre(MDOC_ARGS)
{
	if (n->norm->An.auth == AUTH_split) {
		h->flags &= ~HTML_NOSPLIT;
		h->flags |= HTML_SPLIT;
		return 0;
	}
	if (n->norm->An.auth == AUTH_nosplit) {
		h->flags &= ~HTML_SPLIT;
		h->flags |= HTML_NOSPLIT;
		return 0;
	}

	if (h->flags & HTML_SPLIT)
		print_otag(h, TAG_BR, "");

	if (n->sec == SEC_AUTHORS && ! (h->flags & HTML_NOSPLIT))
		h->flags |= HTML_SPLIT;

	print_otag(h, TAG_SPAN, "c", "An");
	return 1;
}

static int
mdoc_cd_pre(MDOC_ARGS)
{
	synopsis_pre(h, n);
	print_otag(h, TAG_CODE, "c", "Cd");
	return 1;
}

static int
mdoc_dv_pre(MDOC_ARGS)
{
	char	*id;

	if ((id = cond_id(n)) != NULL)
		print_otag(h, TAG_A, "chR", "permalink", id);
	print_otag(h, TAG_CODE, "ci", "Dv", id);
	return 1;
}

static int
mdoc_ev_pre(MDOC_ARGS)
{
	char	*id;

	if ((id = cond_id(n)) != NULL)
		print_otag(h, TAG_A, "chR", "permalink", id);
	print_otag(h, TAG_CODE, "ci", "Ev", id);
	return 1;
}

static int
mdoc_er_pre(MDOC_ARGS)
{
	char	*id;

	id = n->sec == SEC_ERRORS &&
	    (n->parent->tok == MDOC_It ||
	     (n->parent->tok == MDOC_Bq &&
	      n->parent->parent->parent->tok == MDOC_It)) ?
	    html_make_id(n, 1) : NULL;

	if (id != NULL)
		print_otag(h, TAG_A, "chR", "permalink", id);
	print_otag(h, TAG_CODE, "ci", "Er", id);
	return 1;
}

static int
mdoc_fa_pre(MDOC_ARGS)
{
	const struct roff_node	*nn;
	struct tag		*t;

	if (n->parent->tok != MDOC_Fo) {
		print_otag(h, TAG_VAR, "c", "Fa");
		return 1;
	}

	for (nn = n->child; nn; nn = nn->next) {
		t = print_otag(h, TAG_VAR, "c", "Fa");
		print_text(h, nn->string);
		print_tagq(h, t);
		if (nn->next) {
			h->flags |= HTML_NOSPACE;
			print_text(h, ",");
		}
	}

	if (n->child && n->next && n->next->tok == MDOC_Fa) {
		h->flags |= HTML_NOSPACE;
		print_text(h, ",");
	}

	return 0;
}

static int
mdoc_fd_pre(MDOC_ARGS)
{
	struct tag	*t;
	char		*buf, *cp;

	synopsis_pre(h, n);

	if (NULL == (n = n->child))
		return 0;

	assert(n->type == ROFFT_TEXT);

	if (strcmp(n->string, "#include")) {
		print_otag(h, TAG_CODE, "c", "Fd");
		return 1;
	}

	print_otag(h, TAG_CODE, "c", "In");
	print_text(h, n->string);

	if (NULL != (n = n->next)) {
		assert(n->type == ROFFT_TEXT);

		if (h->base_includes) {
			cp = n->string;
			if (*cp == '<' || *cp == '"')
				cp++;
			buf = mandoc_strdup(cp);
			cp = strchr(buf, '\0') - 1;
			if (cp >= buf && (*cp == '>' || *cp == '"'))
				*cp = '\0';
			t = print_otag(h, TAG_A, "chI", "In", buf);
			free(buf);
		} else
			t = print_otag(h, TAG_A, "c", "In");

		print_text(h, n->string);
		print_tagq(h, t);

		n = n->next;
	}

	for ( ; n; n = n->next) {
		assert(n->type == ROFFT_TEXT);
		print_text(h, n->string);
	}

	return 0;
}

static int
mdoc_vt_pre(MDOC_ARGS)
{
	if (n->type == ROFFT_BLOCK) {
		synopsis_pre(h, n);
		return 1;
	} else if (n->type == ROFFT_ELEM) {
		synopsis_pre(h, n);
	} else if (n->type == ROFFT_HEAD)
		return 0;

	print_otag(h, TAG_VAR, "c", "Vt");
	return 1;
}

static int
mdoc_ft_pre(MDOC_ARGS)
{
	synopsis_pre(h, n);
	print_otag(h, TAG_VAR, "c", "Ft");
	return 1;
}

static int
mdoc_fn_pre(MDOC_ARGS)
{
	struct tag	*t;
	char		 nbuf[BUFSIZ];
	const char	*sp, *ep;
	int		 sz, pretty;

	pretty = NODE_SYNPRETTY & n->flags;
	synopsis_pre(h, n);

	/* Split apart into type and name. */
	assert(n->child->string);
	sp = n->child->string;

	ep = strchr(sp, ' ');
	if (NULL != ep) {
		t = print_otag(h, TAG_VAR, "c", "Ft");

		while (ep) {
			sz = MIN((int)(ep - sp), BUFSIZ - 1);
			(void)memcpy(nbuf, sp, (size_t)sz);
			nbuf[sz] = '\0';
			print_text(h, nbuf);
			sp = ++ep;
			ep = strchr(sp, ' ');
		}
		print_tagq(h, t);
	}

	t = print_otag(h, TAG_CODE, "c", "Fn");

	if (sp)
		print_text(h, sp);

	print_tagq(h, t);

	h->flags |= HTML_NOSPACE;
	print_text(h, "(");
	h->flags |= HTML_NOSPACE;

	for (n = n->child->next; n; n = n->next) {
		if (NODE_SYNPRETTY & n->flags)
			t = print_otag(h, TAG_VAR, "cs", "Fa",
			    "white-space", "nowrap");
		else
			t = print_otag(h, TAG_VAR, "c", "Fa");
		print_text(h, n->string);
		print_tagq(h, t);
		if (n->next) {
			h->flags |= HTML_NOSPACE;
			print_text(h, ",");
		}
	}

	h->flags |= HTML_NOSPACE;
	print_text(h, ")");

	if (pretty) {
		h->flags |= HTML_NOSPACE;
		print_text(h, ";");
	}

	return 0;
}

static int
mdoc_sm_pre(MDOC_ARGS)
{

	if (NULL == n->child)
		h->flags ^= HTML_NONOSPACE;
	else if (0 == strcmp("on", n->child->string))
		h->flags &= ~HTML_NONOSPACE;
	else
		h->flags |= HTML_NONOSPACE;

	if ( ! (HTML_NONOSPACE & h->flags))
		h->flags &= ~HTML_NOSPACE;

	return 0;
}

static int
mdoc_skip_pre(MDOC_ARGS)
{

	return 0;
}

static int
mdoc_pp_pre(MDOC_ARGS)
{
	if ((n->flags & NODE_NOFILL) == 0) {
		html_close_paragraph(h);
		print_otag(h, TAG_P, "c", "Pp");
	}
	return 0;
}

static int
mdoc_lk_pre(MDOC_ARGS)
{
	const struct roff_node *link, *descr, *punct;
	struct tag	*t;

	if ((link = n->child) == NULL)
		return 0;

	/* Find beginning of trailing punctuation. */
	punct = n->last;
	while (punct != link && punct->flags & NODE_DELIMC)
		punct = punct->prev;
	punct = punct->next;

	/* Link target and link text. */
	descr = link->next;
	if (descr == punct)
		descr = link;  /* no text */
	t = print_otag(h, TAG_A, "ch", "Lk", link->string);
	do {
		if (descr->flags & (NODE_DELIMC | NODE_DELIMO))
			h->flags |= HTML_NOSPACE;
		print_text(h, descr->string);
		descr = descr->next;
	} while (descr != punct);
	print_tagq(h, t);

	/* Trailing punctuation. */
	while (punct != NULL) {
		h->flags |= HTML_NOSPACE;
		print_text(h, punct->string);
		punct = punct->next;
	}
	return 0;
}

static int
mdoc_mt_pre(MDOC_ARGS)
{
	struct tag	*t;
	char		*cp;

	for (n = n->child; n; n = n->next) {
		assert(n->type == ROFFT_TEXT);

		mandoc_asprintf(&cp, "mailto:%s", n->string);
		t = print_otag(h, TAG_A, "ch", "Mt", cp);
		print_text(h, n->string);
		print_tagq(h, t);
		free(cp);
	}

	return 0;
}

static int
mdoc_fo_pre(MDOC_ARGS)
{
	struct tag	*t;

	if (n->type == ROFFT_BODY) {
		h->flags |= HTML_NOSPACE;
		print_text(h, "(");
		h->flags |= HTML_NOSPACE;
		return 1;
	} else if (n->type == ROFFT_BLOCK) {
		synopsis_pre(h, n);
		return 1;
	}

	if (n->child == NULL)
		return 0;

	assert(n->child->string);
	t = print_otag(h, TAG_CODE, "c", "Fn");
	print_text(h, n->child->string);
	print_tagq(h, t);
	return 0;
}

static void
mdoc_fo_post(MDOC_ARGS)
{

	if (n->type != ROFFT_BODY)
		return;
	h->flags |= HTML_NOSPACE;
	print_text(h, ")");
	h->flags |= HTML_NOSPACE;
	print_text(h, ";");
}

static int
mdoc_in_pre(MDOC_ARGS)
{
	struct tag	*t;

	synopsis_pre(h, n);
	print_otag(h, TAG_CODE, "c", "In");

	/*
	 * The first argument of the `In' gets special treatment as
	 * being a linked value.  Subsequent values are printed
	 * afterward.  groff does similarly.  This also handles the case
	 * of no children.
	 */

	if (NODE_SYNPRETTY & n->flags && NODE_LINE & n->flags)
		print_text(h, "#include");

	print_text(h, "<");
	h->flags |= HTML_NOSPACE;

	if (NULL != (n = n->child)) {
		assert(n->type == ROFFT_TEXT);

		if (h->base_includes)
			t = print_otag(h, TAG_A, "chI", "In", n->string);
		else
			t = print_otag(h, TAG_A, "c", "In");
		print_text(h, n->string);
		print_tagq(h, t);

		n = n->next;
	}

	h->flags |= HTML_NOSPACE;
	print_text(h, ">");

	for ( ; n; n = n->next) {
		assert(n->type == ROFFT_TEXT);
		print_text(h, n->string);
	}

	return 0;
}

static int
mdoc_ic_pre(MDOC_ARGS)
{
	char	*id;

	if ((id = cond_id(n)) != NULL)
		print_otag(h, TAG_A, "chR", "permalink", id);
	print_otag(h, TAG_CODE, "ci", "Ic", id);
	return 1;
}

static int
mdoc_va_pre(MDOC_ARGS)
{
	print_otag(h, TAG_VAR, "c", "Va");
	return 1;
}

static int
mdoc_ap_pre(MDOC_ARGS)
{

	h->flags |= HTML_NOSPACE;
	print_text(h, "\\(aq");
	h->flags |= HTML_NOSPACE;
	return 1;
}

static int
mdoc_bf_pre(MDOC_ARGS)
{
	const char	*cattr;

	switch (n->type) {
	case ROFFT_BLOCK:
		html_close_paragraph(h);
		return 1;
	case ROFFT_HEAD:
		return 0;
	case ROFFT_BODY:
		break;
	default:
		abort();
	}

	if (FONT_Em == n->norm->Bf.font)
		cattr = "Bf Em";
	else if (FONT_Sy == n->norm->Bf.font)
		cattr = "Bf Sy";
	else if (FONT_Li == n->norm->Bf.font)
		cattr = "Bf Li";
	else
		cattr = "Bf No";

	/* Cannot use TAG_SPAN because it may contain blocks. */
	print_otag(h, TAG_DIV, "c", cattr);
	return 1;
}

static int
mdoc_ms_pre(MDOC_ARGS)
{
	char *id;

	if ((id = cond_id(n)) != NULL)
		print_otag(h, TAG_A, "chR", "permalink", id);
	print_otag(h, TAG_SPAN, "ci", "Ms", id);
	return 1;
}

static int
mdoc_igndelim_pre(MDOC_ARGS)
{

	h->flags |= HTML_IGNDELIM;
	return 1;
}

static void
mdoc_pf_post(MDOC_ARGS)
{

	if ( ! (n->next == NULL || n->next->flags & NODE_LINE))
		h->flags |= HTML_NOSPACE;
}

static int
mdoc_rs_pre(MDOC_ARGS)
{
	switch (n->type) {
	case ROFFT_BLOCK:
		if (n->sec == SEC_SEE_ALSO)
			html_close_paragraph(h);
		break;
	case ROFFT_HEAD:
		return 0;
	case ROFFT_BODY:
		if (n->sec == SEC_SEE_ALSO)
			print_otag(h, TAG_P, "c", "Pp");
		print_otag(h, TAG_CITE, "c", "Rs");
		break;
	default:
		abort();
	}
	return 1;
}

static int
mdoc_no_pre(MDOC_ARGS)
{
	char *id;

	if ((id = cond_id(n)) != NULL)
		print_otag(h, TAG_A, "chR", "permalink", id);
	print_otag(h, TAG_SPAN, "ci", "No", id);
	return 1;
}

static int
mdoc_li_pre(MDOC_ARGS)
{
	char	*id;

	if ((id = cond_id(n)) != NULL)
		print_otag(h, TAG_A, "chR", "permalink", id);
	print_otag(h, TAG_CODE, "ci", "Li", id);
	return 1;
}

static int
mdoc_sy_pre(MDOC_ARGS)
{
	print_otag(h, TAG_B, "c", "Sy");
	return 1;
}

static int
mdoc_lb_pre(MDOC_ARGS)
{
	if (SEC_LIBRARY == n->sec && NODE_LINE & n->flags && n->prev)
		print_otag(h, TAG_BR, "");

	print_otag(h, TAG_SPAN, "c", "Lb");
	return 1;
}

static int
mdoc__x_pre(MDOC_ARGS)
{
	const char	*cattr;
	enum htmltag	 t;

	t = TAG_SPAN;

	switch (n->tok) {
	case MDOC__A:
		cattr = "RsA";
		if (n->prev && MDOC__A == n->prev->tok)
			if (NULL == n->next || MDOC__A != n->next->tok)
				print_text(h, "and");
		break;
	case MDOC__B:
		t = TAG_I;
		cattr = "RsB";
		break;
	case MDOC__C:
		cattr = "RsC";
		break;
	case MDOC__D:
		cattr = "RsD";
		break;
	case MDOC__I:
		t = TAG_I;
		cattr = "RsI";
		break;
	case MDOC__J:
		t = TAG_I;
		cattr = "RsJ";
		break;
	case MDOC__N:
		cattr = "RsN";
		break;
	case MDOC__O:
		cattr = "RsO";
		break;
	case MDOC__P:
		cattr = "RsP";
		break;
	case MDOC__Q:
		cattr = "RsQ";
		break;
	case MDOC__R:
		cattr = "RsR";
		break;
	case MDOC__T:
		cattr = "RsT";
		break;
	case MDOC__U:
		print_otag(h, TAG_A, "ch", "RsU", n->child->string);
		return 1;
	case MDOC__V:
		cattr = "RsV";
		break;
	default:
		abort();
	}

	print_otag(h, t, "c", cattr);
	return 1;
}

static void
mdoc__x_post(MDOC_ARGS)
{

	if (MDOC__A == n->tok && n->next && MDOC__A == n->next->tok)
		if (NULL == n->next->next || MDOC__A != n->next->next->tok)
			if (NULL == n->prev || MDOC__A != n->prev->tok)
				return;

	/* TODO: %U */

	if (NULL == n->parent || MDOC_Rs != n->parent->tok)
		return;

	h->flags |= HTML_NOSPACE;
	print_text(h, n->next ? "," : ".");
}

static int
mdoc_bk_pre(MDOC_ARGS)
{

	switch (n->type) {
	case ROFFT_BLOCK:
		break;
	case ROFFT_HEAD:
		return 0;
	case ROFFT_BODY:
		if (n->parent->args != NULL || n->prev->child == NULL)
			h->flags |= HTML_PREKEEP;
		break;
	default:
		abort();
	}

	return 1;
}

static void
mdoc_bk_post(MDOC_ARGS)
{

	if (n->type == ROFFT_BODY)
		h->flags &= ~(HTML_KEEP | HTML_PREKEEP);
}

static int
mdoc_quote_pre(MDOC_ARGS)
{
	if (n->type != ROFFT_BODY)
		return 1;

	switch (n->tok) {
	case MDOC_Ao:
	case MDOC_Aq:
		print_text(h, n->child != NULL && n->child->next == NULL &&
		    n->child->tok == MDOC_Mt ?  "<" : "\\(la");
		break;
	case MDOC_Bro:
	case MDOC_Brq:
		print_text(h, "\\(lC");
		break;
	case MDOC_Bo:
	case MDOC_Bq:
		print_text(h, "\\(lB");
		break;
	case MDOC_Oo:
	case MDOC_Op:
		print_text(h, "\\(lB");
		/*
		 * Give up on semantic markup for now.
		 * We cannot use TAG_SPAN because .Oo may contain blocks.
		 * We cannot use TAG_IDIV because we might be in a
		 * phrasing context (like .Dl or .Pp); we cannot
		 * close out a .Pp at this point either because
		 * that would break the line.
		 */
		/* XXX print_otag(h, TAG_???, "c", "Op"); */
		break;
	case MDOC_En:
		if (NULL == n->norm->Es ||
		    NULL == n->norm->Es->child)
			return 1;
		print_text(h, n->norm->Es->child->string);
		break;
	case MDOC_Do:
	case MDOC_Dq:
	case MDOC_Qo:
	case MDOC_Qq:
		print_text(h, "\\(lq");
		break;
	case MDOC_Po:
	case MDOC_Pq:
		print_text(h, "(");
		break;
	case MDOC_Ql:
		print_text(h, "\\(oq");
		h->flags |= HTML_NOSPACE;
		print_otag(h, TAG_CODE, "c", "Li");
		break;
	case MDOC_So:
	case MDOC_Sq:
		print_text(h, "\\(oq");
		break;
	default:
		abort();
	}

	h->flags |= HTML_NOSPACE;
	return 1;
}

static void
mdoc_quote_post(MDOC_ARGS)
{

	if (n->type != ROFFT_BODY && n->type != ROFFT_ELEM)
		return;

	h->flags |= HTML_NOSPACE;

	switch (n->tok) {
	case MDOC_Ao:
	case MDOC_Aq:
		print_text(h, n->child != NULL && n->child->next == NULL &&
		    n->child->tok == MDOC_Mt ?  ">" : "\\(ra");
		break;
	case MDOC_Bro:
	case MDOC_Brq:
		print_text(h, "\\(rC");
		break;
	case MDOC_Oo:
	case MDOC_Op:
	case MDOC_Bo:
	case MDOC_Bq:
		print_text(h, "\\(rB");
		break;
	case MDOC_En:
		if (n->norm->Es == NULL ||
		    n->norm->Es->child == NULL ||
		    n->norm->Es->child->next == NULL)
			h->flags &= ~HTML_NOSPACE;
		else
			print_text(h, n->norm->Es->child->next->string);
		break;
	case MDOC_Qo:
	case MDOC_Qq:
	case MDOC_Do:
	case MDOC_Dq:
		print_text(h, "\\(rq");
		break;
	case MDOC_Po:
	case MDOC_Pq:
		print_text(h, ")");
		break;
	case MDOC_Ql:
	case MDOC_So:
	case MDOC_Sq:
		print_text(h, "\\(cq");
		break;
	default:
		abort();
	}
}

static int
mdoc_eo_pre(MDOC_ARGS)
{

	if (n->type != ROFFT_BODY)
		return 1;

	if (n->end == ENDBODY_NOT &&
	    n->parent->head->child == NULL &&
	    n->child != NULL &&
	    n->child->end != ENDBODY_NOT)
		print_text(h, "\\&");
	else if (n->end != ENDBODY_NOT ? n->child != NULL :
	    n->parent->head->child != NULL && (n->child != NULL ||
	    (n->parent->tail != NULL && n->parent->tail->child != NULL)))
		h->flags |= HTML_NOSPACE;
	return 1;
}

static void
mdoc_eo_post(MDOC_ARGS)
{
	int	 body, tail;

	if (n->type != ROFFT_BODY)
		return;

	if (n->end != ENDBODY_NOT) {
		h->flags &= ~HTML_NOSPACE;
		return;
	}

	body = n->child != NULL || n->parent->head->child != NULL;
	tail = n->parent->tail != NULL && n->parent->tail->child != NULL;

	if (body && tail)
		h->flags |= HTML_NOSPACE;
	else if ( ! tail)
		h->flags &= ~HTML_NOSPACE;
}

static int
mdoc_abort_pre(MDOC_ARGS)
{
	abort();
}