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Revision 1.144, Thu Jan 13 14:30:13 2011 UTC (13 years, 2 months ago) by kristaps
Branch: MAIN
Changes since 1.143: +20 -4 lines

Change how -Thtml behaves with tables: use multiple rows, with widths
set by COL, until an external macro is encountered.  At this point in
time, close out the table and process the macro.  When the first table
row is again re-encountered, re-start the table.  This requires a bit of
tracking added to "struct html", but the change is very small and
follows the logic of meta-fonts.  This all follows a bug-report by
joerg@.

/*	$Id: mdoc_html.c,v 1.144 2011/01/13 14:30:13 kristaps Exp $ */
/*
 * Copyright (c) 2008, 2009, 2010 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.
 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <sys/types.h>

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

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

#define	INDENT		 5
#define	HALFINDENT	 3

#define	MDOC_ARGS	  const struct mdoc_meta *m, \
			  const struct mdoc_node *n, \
			  struct html *h

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

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

static	void		  print_mdoc(MDOC_ARGS);
static	void		  print_mdoc_head(MDOC_ARGS);
static	void		  print_mdoc_node(MDOC_ARGS);
static	void		  print_mdoc_nodelist(MDOC_ARGS);
static	void	  	  synopsis_pre(struct html *, 
				const struct mdoc_node *);

static	void		  a2width(const char *, struct roffsu *);
static	void		  a2offs(const char *, struct roffsu *);

static	void		  mdoc_root_post(MDOC_ARGS);
static	int		  mdoc_root_pre(MDOC_ARGS);

static	void		  mdoc__x_post(MDOC_ARGS);
static	int		  mdoc__x_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_bt_pre(MDOC_ARGS);
static	int		  mdoc_bx_pre(MDOC_ARGS);
static	int		  mdoc_cd_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	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_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_rv_pre(MDOC_ARGS);
static	int		  mdoc_sh_pre(MDOC_ARGS);
static	int		  mdoc_sm_pre(MDOC_ARGS);
static	int		  mdoc_sp_pre(MDOC_ARGS);
static	int		  mdoc_ss_pre(MDOC_ARGS);
static	int		  mdoc_sx_pre(MDOC_ARGS);
static	int		  mdoc_sy_pre(MDOC_ARGS);
static	int		  mdoc_ud_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 htmlmdoc mdocs[MDOC_MAX] = {
	{mdoc_ap_pre, NULL}, /* Ap */
	{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_ar_pre, NULL}, /* Ar */
	{mdoc_cd_pre, NULL}, /* Cd */
	{mdoc_fl_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 */
	{NULL, NULL}, /* Ot */
	{mdoc_pa_pre, NULL}, /* Pa */
	{mdoc_rv_pre, NULL}, /* Rv */
	{NULL, 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 */
	{NULL, 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_bx_pre, NULL}, /* Bx */
	{NULL, 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 */ 
	{NULL, NULL}, /* Eo */
	{mdoc_xx_pre, NULL}, /* Fx */
	{mdoc_ms_pre, NULL}, /* Ms */
	{mdoc_igndelim_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 */
	{mdoc_bt_pre, NULL}, /* Bt */
	{NULL, NULL}, /* Hf */
	{NULL, NULL}, /* Fr */
	{mdoc_ud_pre, NULL}, /* Ud */
	{mdoc_lb_pre, NULL}, /* Lb */
	{mdoc_pp_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 */ 
	{NULL, NULL}, /* Es */  /* TODO */
	{NULL, NULL}, /* En */  /* TODO */
	{mdoc_xx_pre, NULL}, /* Dx */ 
	{mdoc__x_pre, mdoc__x_post}, /* %Q */ 
	{mdoc_sp_pre, NULL}, /* br */
	{mdoc_sp_pre, NULL}, /* sp */ 
	{mdoc__x_pre, mdoc__x_post}, /* %U */ 
	{NULL, NULL}, /* Ta */ 
};

static	const char * const lists[LIST_MAX] = {
	NULL,
	"list-bul",
	"list-col",
	"list-dash",
	"list-diag",
	"list-enum",
	"list-hang",
	"list-hyph",
	"list-inset",
	"list-item",
	"list-ohang",
	"list-tag"
};

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

	h = (struct html *)arg;

	print_gen_decls(h);
	t = print_otag(h, TAG_HTML, 0, NULL);
	print_mdoc(mdoc_meta(m), mdoc_node(m), h);
	print_tagq(h, t);

	printf("\n");
}


/*
 * Calculate the scaling unit passed in a `-width' argument.  This uses
 * either a native scaling unit (e.g., 1i, 2m) or the string length of
 * the value.
 */
static void
a2width(const char *p, struct roffsu *su)
{

	if ( ! a2roffsu(p, su, SCALE_MAX)) {
		su->unit = SCALE_BU;
		su->scale = (int)strlen(p);
	}
}


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

	if (NULL == n->prev || ! (MDOC_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, 0, NULL);
		return;
	}

	switch (n->prev->tok) {
	case (MDOC_Fd):
		/* FALLTHROUGH */
	case (MDOC_Fn):
		/* FALLTHROUGH */
	case (MDOC_Fo):
		/* FALLTHROUGH */
	case (MDOC_In):
		/* FALLTHROUGH */
	case (MDOC_Vt):
		print_otag(h, TAG_P, 0, NULL);
		break;
	case (MDOC_Ft):
		if (MDOC_Fn != n->tok && MDOC_Fo != n->tok) {
			print_otag(h, TAG_P, 0, NULL);
			break;
		}
		/* FALLTHROUGH */
	default:
		print_otag(h, TAG_BR, 0, NULL);
		break;
	}
}


/*
 * Calculate the scaling unit passed in an `-offset' argument.  This
 * uses either a native scaling unit (e.g., 1i, 2m), one of a set of
 * predefined strings (indent, etc.), or the string length of the value.
 */
static void
a2offs(const char *p, struct roffsu *su)
{

	/* FIXME: "right"? */

	if (0 == strcmp(p, "left"))
		SCALE_HS_INIT(su, 0);
	else if (0 == strcmp(p, "indent"))
		SCALE_HS_INIT(su, INDENT);
	else if (0 == strcmp(p, "indent-two"))
		SCALE_HS_INIT(su, INDENT * 2);
	else if ( ! a2roffsu(p, su, SCALE_MAX)) {
		su->unit = SCALE_BU;
		su->scale = (int)strlen(p);
	}
}


static void
print_mdoc(MDOC_ARGS)
{
	struct tag	*t;

	t = print_otag(h, TAG_HEAD, 0, NULL);
	print_mdoc_head(m, n, h);
	print_tagq(h, t);

	t = print_otag(h, TAG_BODY, 0, NULL);
	print_mdoc_nodelist(m, n, h);
	print_tagq(h, t);
}


/* ARGSUSED */
static void
print_mdoc_head(MDOC_ARGS)
{

	print_gen_head(h);
	bufinit(h);
	buffmt(h, "%s(%s)", m->title, m->msec);

	if (m->arch) {
		bufcat(h, " (");
		bufcat(h, m->arch);
		bufcat(h, ")");
	}

	print_otag(h, TAG_TITLE, 0, NULL);
	print_text(h, h->buf);
}


static void
print_mdoc_nodelist(MDOC_ARGS)
{

	print_mdoc_node(m, n, h);
	if (n->next)
		print_mdoc_nodelist(m, n->next, h);
}


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

	child = 1;
	t = h->tags.head;

	bufinit(h);
	switch (n->type) {
	case (MDOC_ROOT):
		child = mdoc_root_pre(m, n, h);
		break;
	case (MDOC_TEXT):
		/* No tables in this mode... */
		assert(NULL == h->tblt);
		if (' ' == *n->string && MDOC_LINE & n->flags)
			print_otag(h, TAG_BR, 0, NULL);
		print_text(h, n->string);
		return;
	case (MDOC_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) {
			print_tblclose(h);
			t = h->tags.head;
		}

		assert(NULL == h->tblt);
		if (mdocs[n->tok].pre && ENDBODY_NOT == n->end)
			child = (*mdocs[n->tok].pre)(m, n, h);
		break;
	}

	if (HTML_KEEP & h->flags) {
		if (n->prev && n->prev->line != n->line) {
			h->flags &= ~HTML_KEEP;
			h->flags |= HTML_PREKEEP;
		} else if (NULL == n->prev) {
			if (n->parent && n->parent->line != n->line) {
				h->flags &= ~HTML_KEEP;
				h->flags |= HTML_PREKEEP;
			}
		}
	}

	if (child && n->child)
		print_mdoc_nodelist(m, n->child, h);

	print_stagq(h, t);

	bufinit(h);
	switch (n->type) {
	case (MDOC_ROOT):
		mdoc_root_post(m, n, h);
		break;
	default:
		if (mdocs[n->tok].post && ENDBODY_NOT == n->end)
			(*mdocs[n->tok].post)(m, n, h);
		break;
	}
}

/* ARGSUSED */
static void
mdoc_root_post(MDOC_ARGS)
{
	struct htmlpair	 tag[3];
	struct tag	*t, *tt;
	char		 b[DATESIZ];

	time2a(m->date, b, DATESIZ);

	PAIR_SUMMARY_INIT(&tag[0], "Document Footer");
	PAIR_CLASS_INIT(&tag[1], "foot");
	if (NULL == h->style) {
		PAIR_INIT(&tag[2], ATTR_WIDTH, "100%");
		t = print_otag(h, TAG_TABLE, 3, tag);
		PAIR_INIT(&tag[0], ATTR_WIDTH, "50%");
		print_otag(h, TAG_COL, 1, tag);
		print_otag(h, TAG_COL, 1, tag);
	} else
		t = print_otag(h, TAG_TABLE, 2, tag);

	t = print_otag(h, TAG_TBODY, 0, NULL);

	tt = print_otag(h, TAG_TR, 0, NULL);

	PAIR_CLASS_INIT(&tag[0], "foot-date");
	print_otag(h, TAG_TD, 1, tag);

	print_text(h, b);
	print_stagq(h, tt);

	PAIR_CLASS_INIT(&tag[0], "foot-os");
	if (NULL == h->style) {
		PAIR_INIT(&tag[1], ATTR_ALIGN, "right");
		print_otag(h, TAG_TD, 2, tag);
	} else 
		print_otag(h, TAG_TD, 1, tag);

	print_text(h, m->os);
	print_tagq(h, t);
}


/* ARGSUSED */
static int
mdoc_root_pre(MDOC_ARGS)
{
	struct htmlpair	 tag[3];
	struct tag	*t, *tt;
	char		 b[BUFSIZ], title[BUFSIZ];

	strlcpy(b, m->vol, BUFSIZ);

	if (m->arch) {
		strlcat(b, " (", BUFSIZ);
		strlcat(b, m->arch, BUFSIZ);
		strlcat(b, ")", BUFSIZ);
	}

	snprintf(title, BUFSIZ - 1, "%s(%s)", m->title, m->msec);

	PAIR_SUMMARY_INIT(&tag[0], "Document Header");
	PAIR_CLASS_INIT(&tag[1], "head");
	if (NULL == h->style) {
		PAIR_INIT(&tag[2], ATTR_WIDTH, "100%");
		t = print_otag(h, TAG_TABLE, 3, tag);
		PAIR_INIT(&tag[0], ATTR_WIDTH, "30%");
		print_otag(h, TAG_COL, 1, tag);
		print_otag(h, TAG_COL, 1, tag);
		print_otag(h, TAG_COL, 1, tag);
	} else
		t = print_otag(h, TAG_TABLE, 2, tag);

	print_otag(h, TAG_TBODY, 0, NULL);

	tt = print_otag(h, TAG_TR, 0, NULL);

	PAIR_CLASS_INIT(&tag[0], "head-ltitle");
	print_otag(h, TAG_TD, 1, tag);

	print_text(h, title);
	print_stagq(h, tt);

	PAIR_CLASS_INIT(&tag[0], "head-vol");
	if (NULL == h->style) {
		PAIR_INIT(&tag[1], ATTR_ALIGN, "center");
		print_otag(h, TAG_TD, 2, tag);
	} else 
		print_otag(h, TAG_TD, 1, tag);

	print_text(h, b);
	print_stagq(h, tt);

	PAIR_CLASS_INIT(&tag[0], "head-rtitle");
	if (NULL == h->style) {
		PAIR_INIT(&tag[1], ATTR_ALIGN, "right");
		print_otag(h, TAG_TD, 2, tag);
	} else 
		print_otag(h, TAG_TD, 1, tag);

	print_text(h, title);
	print_tagq(h, t);
	return(1);
}


/* ARGSUSED */
static int
mdoc_sh_pre(MDOC_ARGS)
{
	struct htmlpair	 tag;
	char		 buf[BUFSIZ];

	if (MDOC_BLOCK == n->type) {
		PAIR_CLASS_INIT(&tag, "section");
		print_otag(h, TAG_DIV, 1, &tag);
		return(1);
	} else if (MDOC_BODY == n->type)
		return(1);

	buf[0] = '\0';
	for (n = n->child; n; n = n->next) {
		html_idcat(buf, n->string, BUFSIZ);
		if (n->next)
			html_idcat(buf, " ", BUFSIZ);
	}

	PAIR_ID_INIT(&tag, buf);
	print_otag(h, TAG_H1, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_ss_pre(MDOC_ARGS)
{
	struct htmlpair	 tag;
	char		 buf[BUFSIZ];

	if (MDOC_BLOCK == n->type) {
		PAIR_CLASS_INIT(&tag, "subsection");
		print_otag(h, TAG_DIV, 1, &tag);
		return(1);
	} else if (MDOC_BODY == n->type)
		return(1);

	buf[0] = '\0';
	for (n = n->child; n; n = n->next) {
		html_idcat(buf, n->string, BUFSIZ);
		if (n->next)
			html_idcat(buf, " ", BUFSIZ);
	}

	PAIR_ID_INIT(&tag, buf);
	print_otag(h, TAG_H2, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_fl_pre(MDOC_ARGS)
{
	struct htmlpair	 tag;

	PAIR_CLASS_INIT(&tag, "flag");
	print_otag(h, TAG_B, 1, &tag);

	/* `Cm' has no leading hyphen. */

	if (MDOC_Cm == n->tok)
		return(1);

	print_text(h, "\\-");

	if (n->child)
		h->flags |= HTML_NOSPACE;
	else if (n->next && n->next->line == n->line)
		h->flags |= HTML_NOSPACE;

	return(1);
}


/* ARGSUSED */
static int
mdoc_nd_pre(MDOC_ARGS)
{
	struct htmlpair	 tag;

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

	/* XXX: this tag in theory can contain block elements. */

	print_text(h, "\\(em");
	PAIR_CLASS_INIT(&tag, "desc");
	print_otag(h, TAG_SPAN, 1, &tag);
	return(1);
}


static int
mdoc_nm_pre(MDOC_ARGS)
{
	struct htmlpair	 tag;
	struct roffsu	 su;
	size_t		 len;

	switch (n->type) {
	case (MDOC_ELEM):
		synopsis_pre(h, n);
		PAIR_CLASS_INIT(&tag, "name");
		print_otag(h, TAG_B, 1, &tag);
		if (NULL == n->child && m->name)
			print_text(h, m->name);
		return(1);
	case (MDOC_HEAD):
		print_otag(h, TAG_TD, 0, NULL);
		if (NULL == n->child && m->name)
			print_text(h, m->name);
		return(1);
	case (MDOC_BODY):
		print_otag(h, TAG_TD, 0, NULL);
		return(1);
	default:
		break;
	}

	synopsis_pre(h, n);
	PAIR_CLASS_INIT(&tag, "synopsis");
	print_otag(h, TAG_TABLE, 1, &tag);

	for (len = 0, n = n->child; n; n = n->next)
		if (MDOC_TEXT == n->type)
			len += strlen(n->string);

	if (0 == len && m->name)
		len = strlen(m->name);

	SCALE_HS_INIT(&su, (double)len);
	bufcat_su(h, "width", &su);
	PAIR_STYLE_INIT(&tag, h);
	print_otag(h, TAG_COL, 1, &tag);
	print_otag(h, TAG_COL, 0, NULL);
	print_otag(h, TAG_TBODY, 0, NULL);
	print_otag(h, TAG_TR, 0, NULL);
	return(1);
}


/* ARGSUSED */
static int
mdoc_xr_pre(MDOC_ARGS)
{
	struct htmlpair	 	 tag[2];
	const struct mdoc_node	*nn;

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

	PAIR_CLASS_INIT(&tag[0], "link-man");

	if (h->base_man) {
		buffmt_man(h, n->child->string, 
				n->child->next ? 
				n->child->next->string : NULL);
		PAIR_HREF_INIT(&tag[1], h->buf);
		print_otag(h, TAG_A, 2, tag);
	} else
		print_otag(h, TAG_A, 1, tag);

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

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

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


/* ARGSUSED */
static int
mdoc_ns_pre(MDOC_ARGS)
{

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


/* ARGSUSED */
static int
mdoc_ar_pre(MDOC_ARGS)
{
	struct htmlpair tag;

	PAIR_CLASS_INIT(&tag, "arg");
	print_otag(h, TAG_I, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_xx_pre(MDOC_ARGS)
{
	const char	*pp;
	struct htmlpair	 tag;

	switch (n->tok) {
	case (MDOC_Bsx):
		pp = "BSD/OS";
		break;
	case (MDOC_Dx):
		pp = "DragonFly";
		break;
	case (MDOC_Fx):
		pp = "FreeBSD";
		break;
	case (MDOC_Nx):
		pp = "NetBSD";
		break;
	case (MDOC_Ox):
		pp = "OpenBSD";
		break;
	case (MDOC_Ux):
		pp = "UNIX";
		break;
	default:
		return(1);
	}

	PAIR_CLASS_INIT(&tag, "unix");
	print_otag(h, TAG_SPAN, 1, &tag);
	print_text(h, pp);
	return(1);
}


/* ARGSUSED */
static int
mdoc_bx_pre(MDOC_ARGS)
{
	const struct mdoc_node	*nn;
	struct htmlpair		 tag;

	PAIR_CLASS_INIT(&tag, "unix");
	print_otag(h, TAG_SPAN, 1, &tag);

	for (nn = n->child; nn; nn = nn->next)
		print_mdoc_node(m, nn, h);

	if (n->child)
		h->flags |= HTML_NOSPACE;

	print_text(h, "BSD");
	return(0);
}

/* ARGSUSED */
static int
mdoc_it_pre(MDOC_ARGS)
{
	struct roffsu	 su;
	enum mdoc_list	 type;
	struct htmlpair	 tag[2];
	const struct mdoc_node *bl;

	bl = n->parent;
	while (bl && MDOC_Bl != bl->tok)
		bl = bl->parent;

	assert(bl);

	type = bl->norm->Bl.type;

	assert(lists[type]);
	PAIR_CLASS_INIT(&tag[0], lists[type]);

	if (MDOC_HEAD == n->type) {
		switch (type) {
		case(LIST_bullet):
			/* FALLTHROUGH */
		case(LIST_dash):
			/* FALLTHROUGH */
		case(LIST_item):
			/* FALLTHROUGH */
		case(LIST_hyphen):
			/* FALLTHROUGH */
		case(LIST_enum):
			return(0);
		case(LIST_diag):
			/* FALLTHROUGH */
		case(LIST_hang):
			/* FALLTHROUGH */
		case(LIST_inset):
			/* FALLTHROUGH */
		case(LIST_ohang):
			/* FALLTHROUGH */
		case(LIST_tag):
			SCALE_VS_INIT(&su, ! bl->norm->Bl.comp);
			bufcat_su(h, "margin-top", &su);
			PAIR_STYLE_INIT(&tag[1], h);
			print_otag(h, TAG_DT, 2, tag);
			if (LIST_diag != type)
				break;
			PAIR_CLASS_INIT(&tag[0], "diag");
			print_otag(h, TAG_B, 1, tag);
			break;
		case(LIST_column):
			break;
		default:
			break;
		}
	} else if (MDOC_BODY == n->type) {
		switch (type) {
		case(LIST_bullet):
			/* FALLTHROUGH */
		case(LIST_hyphen):
			/* FALLTHROUGH */
		case(LIST_dash):
			/* FALLTHROUGH */
		case(LIST_enum):
			/* FALLTHROUGH */
		case(LIST_item):
			SCALE_VS_INIT(&su, ! bl->norm->Bl.comp);
			bufcat_su(h, "margin-top", &su);
			PAIR_STYLE_INIT(&tag[1], h);
			print_otag(h, TAG_LI, 2, tag);
			break;
		case(LIST_diag):
			/* FALLTHROUGH */
		case(LIST_hang):
			/* FALLTHROUGH */
		case(LIST_inset):
			/* FALLTHROUGH */
		case(LIST_ohang):
			/* FALLTHROUGH */
		case(LIST_tag):
			if (NULL == bl->norm->Bl.width) {
				print_otag(h, TAG_DD, 1, tag);
				break;
			}
			a2width(bl->norm->Bl.width, &su);
			bufcat_su(h, "margin-left", &su);
			PAIR_STYLE_INIT(&tag[1], h);
			print_otag(h, TAG_DD, 2, tag);
			break;
		case(LIST_column):
			SCALE_VS_INIT(&su, ! bl->norm->Bl.comp);
			bufcat_su(h, "margin-top", &su);
			PAIR_STYLE_INIT(&tag[1], h);
			print_otag(h, TAG_TD, 2, tag);
			break;
		default:
			break;
		}
	} else {
		switch (type) {
		case (LIST_column):
			print_otag(h, TAG_TR, 1, tag);
			break;
		default:
			break;
		}
	}

	return(1);
}

/* ARGSUSED */
static int
mdoc_bl_pre(MDOC_ARGS)
{
	int		 i;
	struct htmlpair	 tag[3];
	struct roffsu	 su;
	char		 buf[BUFSIZ];

	if (MDOC_BODY == n->type) {
		if (LIST_column == n->norm->Bl.type)
			print_otag(h, TAG_TBODY, 0, NULL);
		return(1);
	}

	if (MDOC_HEAD == n->type) {
		if (LIST_column != n->norm->Bl.type)
			return(0);

		/*
		 * For each column, print out the <COL> tag with our
		 * suggested width.  The last column gets min-width, as
		 * in terminal mode it auto-sizes to the width of the
		 * screen and we want to preserve that behaviour.
		 */

		for (i = 0; i < (int)n->norm->Bl.ncols; i++) {
			a2width(n->norm->Bl.cols[i], &su);
			bufinit(h);
			if (i < (int)n->norm->Bl.ncols - 1)
				bufcat_su(h, "width", &su);
			else
				bufcat_su(h, "min-width", &su);
			PAIR_STYLE_INIT(&tag[0], h);
			print_otag(h, TAG_COL, 1, tag);
		}

		return(0);
	}

	SCALE_VS_INIT(&su, 0);
	bufcat_su(h, "margin-top", &su);
	bufcat_su(h, "margin-bottom", &su);
	PAIR_STYLE_INIT(&tag[0], h);

	assert(lists[n->norm->Bl.type]);
	strlcpy(buf, "list ", BUFSIZ);
	strlcat(buf, lists[n->norm->Bl.type], BUFSIZ);
	PAIR_INIT(&tag[1], ATTR_CLASS, buf);

	/* Set the block's left-hand margin. */

	if (n->norm->Bl.offs) {
		a2offs(n->norm->Bl.offs, &su);
		bufcat_su(h, "margin-left", &su);
	}

	switch (n->norm->Bl.type) {
	case(LIST_bullet):
		/* FALLTHROUGH */
	case(LIST_dash):
		/* FALLTHROUGH */
	case(LIST_hyphen):
		/* FALLTHROUGH */
	case(LIST_item):
		print_otag(h, TAG_UL, 2, tag);
		break;
	case(LIST_enum):
		print_otag(h, TAG_OL, 2, tag);
		break;
	case(LIST_diag):
		/* FALLTHROUGH */
	case(LIST_hang):
		/* FALLTHROUGH */
	case(LIST_inset):
		/* FALLTHROUGH */
	case(LIST_ohang):
		/* FALLTHROUGH */
	case(LIST_tag):
		print_otag(h, TAG_DL, 2, tag);
		break;
	case(LIST_column):
		print_otag(h, TAG_TABLE, 2, tag);
		break;
	default:
		abort();
		/* NOTREACHED */
	}

	return(1);
}

/* ARGSUSED */
static int
mdoc_ex_pre(MDOC_ARGS)
{
	const struct mdoc_node	*nn;
	struct tag		*t;
	struct htmlpair		 tag;

	if (n->prev)
		print_otag(h, TAG_BR, 0, NULL);

	PAIR_CLASS_INIT(&tag, "utility");

	print_text(h, "The");
	for (nn = n->child; nn; nn = nn->next) {
		t = print_otag(h, TAG_B, 1, &tag);
		print_text(h, nn->string);
		print_tagq(h, t);

		h->flags |= HTML_NOSPACE;

		if (nn->next && NULL == nn->next->next)
			print_text(h, ", and");
		else if (nn->next)
			print_text(h, ",");
		else
			h->flags &= ~HTML_NOSPACE;
	}

	if (n->child && n->child->next)
		print_text(h, "utilities exit");
	else
		print_text(h, "utility exits");

       	print_text(h, "0 on success, and >0 if an error occurs.");
	return(0);
}


/* ARGSUSED */
static int
mdoc_em_pre(MDOC_ARGS)
{
	struct htmlpair	tag;

	PAIR_CLASS_INIT(&tag, "emph");
	print_otag(h, TAG_SPAN, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_d1_pre(MDOC_ARGS)
{
	struct htmlpair	 tag[2];
	struct roffsu	 su;

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

	SCALE_VS_INIT(&su, 0);
	bufcat_su(h, "margin-top", &su);
	bufcat_su(h, "margin-bottom", &su);
	PAIR_STYLE_INIT(&tag[0], h);
	print_otag(h, TAG_BLOCKQUOTE, 1, tag);

	/* BLOCKQUOTE needs a block body. */

	PAIR_CLASS_INIT(&tag[0], "display");
	print_otag(h, TAG_DIV, 1, tag);

	if (MDOC_Dl == n->tok) {
		PAIR_CLASS_INIT(&tag[0], "lit");
		print_otag(h, TAG_CODE, 1, tag);
	} 

	return(1);
}


/* ARGSUSED */
static int
mdoc_sx_pre(MDOC_ARGS)
{
	struct htmlpair		 tag[2];
	const struct mdoc_node	*nn;
	char			 buf[BUFSIZ];

	strlcpy(buf, "#", BUFSIZ);
	for (nn = n->child; nn; nn = nn->next) {
		html_idcat(buf, nn->string, BUFSIZ);
		if (nn->next)
			html_idcat(buf, " ", BUFSIZ);
	}

	PAIR_CLASS_INIT(&tag[0], "link-sec");
	PAIR_HREF_INIT(&tag[1], buf);

	print_otag(h, TAG_I, 1, tag);
	print_otag(h, TAG_A, 2, tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_bd_pre(MDOC_ARGS)
{
	struct htmlpair	 	 tag[2];
	int		 	 comp;
	const struct mdoc_node	*nn;
	struct roffsu		 su;

	if (MDOC_HEAD == n->type)
		return(0);

	if (MDOC_BLOCK == n->type) {
		comp = n->norm->Bd.comp;
		for (nn = n; nn && ! comp; nn = nn->parent) {
			if (MDOC_BLOCK != nn->type)
				continue;
			if (MDOC_Ss == nn->tok || MDOC_Sh == nn->tok)
				comp = 1;
			if (nn->prev)
				break;
		}
		if ( ! comp)
			print_otag(h, TAG_P, 0, NULL);
		return(1);
	}

	SCALE_HS_INIT(&su, 0);
	if (n->norm->Bd.offs)
		a2offs(n->norm->Bd.offs, &su);

	bufcat_su(h, "margin-left", &su);
	PAIR_STYLE_INIT(&tag[0], h);

	if (DISP_unfilled != n->norm->Bd.type && 
			DISP_literal != n->norm->Bd.type) {
		PAIR_CLASS_INIT(&tag[1], "display");
		print_otag(h, TAG_DIV, 2, tag);
		return(1);
	}

	PAIR_CLASS_INIT(&tag[1], "lit display");
	print_otag(h, TAG_PRE, 2, tag);

	for (nn = n->child; nn; nn = nn->next) {
		print_mdoc_node(m, nn, h);
		/*
		 * If the printed node flushes its own line, then we
		 * needn't do it here as well.  This is hacky, but the
		 * notion of selective eoln whitespace is pretty dumb
		 * anyway, so don't sweat it.
		 */
		switch (nn->tok) {
		case (MDOC_Sm):
			/* FALLTHROUGH */
		case (MDOC_br):
			/* FALLTHROUGH */
		case (MDOC_sp):
			/* FALLTHROUGH */
		case (MDOC_Bl):
			/* FALLTHROUGH */
		case (MDOC_D1):
			/* FALLTHROUGH */
		case (MDOC_Dl):
			/* FALLTHROUGH */
		case (MDOC_Lp):
			/* FALLTHROUGH */
		case (MDOC_Pp):
			continue;
		default:
			break;
		}
		if (nn->next && nn->next->line == nn->line)
			continue;
		else if (nn->next)
			print_text(h, "\n");

		h->flags |= HTML_NOSPACE;
	}

	return(0);
}


/* ARGSUSED */
static int
mdoc_pa_pre(MDOC_ARGS)
{
	struct htmlpair	tag;

	PAIR_CLASS_INIT(&tag, "file");
	print_otag(h, TAG_I, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_ad_pre(MDOC_ARGS)
{
	struct htmlpair	tag;

	PAIR_CLASS_INIT(&tag, "addr");
	print_otag(h, TAG_I, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_an_pre(MDOC_ARGS)
{
	struct htmlpair	tag;

	/* TODO: -split and -nosplit (see termp_an_pre()). */

	PAIR_CLASS_INIT(&tag, "author");
	print_otag(h, TAG_SPAN, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_cd_pre(MDOC_ARGS)
{
	struct htmlpair	tag;

	synopsis_pre(h, n);
	PAIR_CLASS_INIT(&tag, "config");
	print_otag(h, TAG_B, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_dv_pre(MDOC_ARGS)
{
	struct htmlpair	tag;

	PAIR_CLASS_INIT(&tag, "define");
	print_otag(h, TAG_SPAN, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_ev_pre(MDOC_ARGS)
{
	struct htmlpair	tag;

	PAIR_CLASS_INIT(&tag, "env");
	print_otag(h, TAG_SPAN, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_er_pre(MDOC_ARGS)
{
	struct htmlpair	tag;

	PAIR_CLASS_INIT(&tag, "errno");
	print_otag(h, TAG_SPAN, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_fa_pre(MDOC_ARGS)
{
	const struct mdoc_node	*nn;
	struct htmlpair		 tag;
	struct tag		*t;

	PAIR_CLASS_INIT(&tag, "farg");
	if (n->parent->tok != MDOC_Fo) {
		print_otag(h, TAG_I, 1, &tag);
		return(1);
	}

	for (nn = n->child; nn; nn = nn->next) {
		t = print_otag(h, TAG_I, 1, &tag);
		print_text(h, nn->string);
		print_tagq(h, t);
		if (nn->next)
			print_text(h, ",");
	}

	if (n->child && n->next && n->next->tok == MDOC_Fa)
		print_text(h, ",");

	return(0);
}


/* ARGSUSED */
static int
mdoc_fd_pre(MDOC_ARGS)
{
	struct htmlpair	 tag;

	synopsis_pre(h, n);

	PAIR_CLASS_INIT(&tag, "macro");
	print_otag(h, TAG_B, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_vt_pre(MDOC_ARGS)
{
	struct htmlpair	 tag;

	if (MDOC_BLOCK == n->type) {
		synopsis_pre(h, n);
		return(1);
	} else if (MDOC_ELEM == n->type) {
		synopsis_pre(h, n);
	} else if (MDOC_HEAD == n->type)
		return(0);

	PAIR_CLASS_INIT(&tag, "type");
	print_otag(h, TAG_SPAN, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_ft_pre(MDOC_ARGS)
{
	struct htmlpair	 tag;

	synopsis_pre(h, n);
	PAIR_CLASS_INIT(&tag, "ftype");
	print_otag(h, TAG_I, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_fn_pre(MDOC_ARGS)
{
	struct tag		*t;
	struct htmlpair	 	 tag[2];
	const struct mdoc_node	*nn;
	char			 nbuf[BUFSIZ];
	const char		*sp, *ep;
	int			 sz, i;

	synopsis_pre(h, n);

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

	ep = strchr(sp, ' ');
	if (NULL != ep) {
		PAIR_CLASS_INIT(&tag[0], "ftype");
		t = print_otag(h, TAG_I, 1, tag);
	
		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);
	}

	PAIR_CLASS_INIT(&tag[0], "fname");

	/*
	 * FIXME: only refer to IDs that we know exist.
	 */

#if 0
	if (MDOC_SYNPRETTY & n->flags) {
		nbuf[0] = '\0';
		html_idcat(nbuf, sp, BUFSIZ);
		PAIR_ID_INIT(&tag[1], nbuf);
	} else {
		strlcpy(nbuf, "#", BUFSIZ);
		html_idcat(nbuf, sp, BUFSIZ);
		PAIR_HREF_INIT(&tag[1], nbuf);
	}
#endif

	t = print_otag(h, TAG_B, 1, tag);

	if (sp) {
		strlcpy(nbuf, sp, BUFSIZ);
		print_text(h, nbuf);
	}

	print_tagq(h, t);

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

	bufinit(h);
	PAIR_CLASS_INIT(&tag[0], "farg");
	bufcat_style(h, "white-space", "nowrap");
	PAIR_STYLE_INIT(&tag[1], h);

	for (nn = n->child->next; nn; nn = nn->next) {
		i = 1;
		if (MDOC_SYNPRETTY & n->flags)
			i = 2;
		t = print_otag(h, TAG_I, i, tag);
		print_text(h, nn->string);
		print_tagq(h, t);
		if (nn->next)
			print_text(h, ",");
	}

	print_text(h, ")");
	if (MDOC_SYNPRETTY & n->flags)
		print_text(h, ";");

	return(0);
}


/* ARGSUSED */
static int
mdoc_sm_pre(MDOC_ARGS)
{

	assert(n->child && MDOC_TEXT == n->child->type);
	if (0 == strcmp("on", n->child->string)) {
		/* 
		 * FIXME: no p->col to check.  Thus, if we have
		 *  .Bd -literal
		 *  .Sm off
		 *  1 2
		 *  .Sm on
		 *  3
		 *  .Ed
		 * the "3" is preceded by a space.
		 */
		h->flags &= ~HTML_NOSPACE;
		h->flags &= ~HTML_NONOSPACE;
	} else
		h->flags |= HTML_NONOSPACE;

	return(0);
}

/* ARGSUSED */
static int
mdoc_pp_pre(MDOC_ARGS)
{

	print_otag(h, TAG_P, 0, NULL);
	return(0);

}

/* ARGSUSED */
static int
mdoc_sp_pre(MDOC_ARGS)
{
	struct roffsu	 su;
	struct htmlpair	 tag;

	SCALE_VS_INIT(&su, 1);

	if (MDOC_sp == n->tok) {
		if (n->child)
			a2roffsu(n->child->string, &su, SCALE_VS);
	} else
		su.scale = 0;

	bufcat_su(h, "height", &su);
	PAIR_STYLE_INIT(&tag, h);
	print_otag(h, TAG_DIV, 1, &tag);

	/* So the div isn't empty: */
	print_text(h, "\\~");

	return(0);

}

/* ARGSUSED */
static int
mdoc_lk_pre(MDOC_ARGS)
{
	const struct mdoc_node	*nn;
	struct htmlpair		 tag[2];

	nn = n->child;

	PAIR_CLASS_INIT(&tag[0], "link-ext");
	PAIR_HREF_INIT(&tag[1], nn->string);
	print_otag(h, TAG_A, 2, tag);

	if (NULL == nn || NULL == nn->next) 
		return(1);

	for (nn = nn->next; nn; nn = nn->next) 
		print_text(h, nn->string);

	return(0);
}


/* ARGSUSED */
static int
mdoc_mt_pre(MDOC_ARGS)
{
	struct htmlpair	 	 tag[2];
	struct tag		*t;
	const struct mdoc_node	*nn;

	PAIR_CLASS_INIT(&tag[0], "link-mail");

	for (nn = n->child; nn; nn = nn->next) {
		bufinit(h);
		bufcat(h, "mailto:");
		bufcat(h, nn->string);
		PAIR_HREF_INIT(&tag[1], h->buf);
		t = print_otag(h, TAG_A, 2, tag);
		print_text(h, nn->string);
		print_tagq(h, t);
	}
	
	return(0);
}


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

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

	/* XXX: we drop non-initial arguments as per groff. */

	assert(n->child);
	assert(n->child->string);

	PAIR_CLASS_INIT(&tag, "fname");
	t = print_otag(h, TAG_B, 1, &tag);
	print_text(h, n->child->string);
	print_tagq(h, t);
	return(0);
}


/* ARGSUSED */
static void
mdoc_fo_post(MDOC_ARGS)
{

	if (MDOC_BODY != n->type)
		return;
	print_text(h, ")");
	print_text(h, ";");
}


/* ARGSUSED */
static int
mdoc_in_pre(MDOC_ARGS)
{
	const struct mdoc_node	*nn;
	struct tag		*t;
	struct htmlpair		 tag[2];
	int			 i;

	synopsis_pre(h, n);

	PAIR_CLASS_INIT(&tag[0], "includes");
	print_otag(h, TAG_B, 1, tag);

	if (MDOC_SYNPRETTY & n->flags && MDOC_LINE & n->flags)
		print_text(h, "#include");

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

	for (nn = n->child; nn; nn = nn->next) {
		PAIR_CLASS_INIT(&tag[0], "link-includes");
		i = 1;
		bufinit(h);
		if (h->base_includes) {
			buffmt_includes(h, nn->string);
			PAIR_HREF_INIT(&tag[i], h->buf);
			i++;
		}
		t = print_otag(h, TAG_A, i, tag);
		print_mdoc_node(m, nn, h);
		print_tagq(h, t);
	}

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

	return(0);
}


/* ARGSUSED */
static int
mdoc_ic_pre(MDOC_ARGS)
{
	struct htmlpair	tag;

	PAIR_CLASS_INIT(&tag, "cmd");
	print_otag(h, TAG_B, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_rv_pre(MDOC_ARGS)
{
	const struct mdoc_node	*nn;
	struct htmlpair		 tag;
	struct tag		*t;

	if (n->prev)
		print_otag(h, TAG_BR, 0, NULL);

	print_text(h, "The");

	for (nn = n->child; nn; nn = nn->next) {
		PAIR_CLASS_INIT(&tag, "fname");
		t = print_otag(h, TAG_B, 1, &tag);
		print_text(h, nn->string);
		print_tagq(h, t);

		h->flags |= HTML_NOSPACE;
		if (nn->next && NULL == nn->next->next)
			print_text(h, "(), and");
		else if (nn->next)
			print_text(h, "(),");
		else
			print_text(h, "()");
	}

	if (n->child && n->child->next)
		print_text(h, "functions return");
	else
		print_text(h, "function returns");

       	print_text(h, "the value 0 if successful; otherwise the value "
			"-1 is returned and the global variable");

	PAIR_CLASS_INIT(&tag, "var");
	t = print_otag(h, TAG_B, 1, &tag);
	print_text(h, "errno");
	print_tagq(h, t);
       	print_text(h, "is set to indicate the error.");
	return(0);
}


/* ARGSUSED */
static int
mdoc_va_pre(MDOC_ARGS)
{
	struct htmlpair	tag;

	PAIR_CLASS_INIT(&tag, "var");
	print_otag(h, TAG_B, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_ap_pre(MDOC_ARGS)
{
	
	h->flags |= HTML_NOSPACE;
	print_text(h, "\\(aq");
	h->flags |= HTML_NOSPACE;
	return(1);
}


/* ARGSUSED */
static int
mdoc_bf_pre(MDOC_ARGS)
{
	struct htmlpair	 tag[2];
	struct roffsu	 su;

	if (MDOC_HEAD == n->type)
		return(0);
	else if (MDOC_BODY != n->type)
		return(1);

	if (FONT_Em == n->norm->Bf.font) 
		PAIR_CLASS_INIT(&tag[0], "emph");
	else if (FONT_Sy == n->norm->Bf.font) 
		PAIR_CLASS_INIT(&tag[0], "symb");
	else if (FONT_Li == n->norm->Bf.font) 
		PAIR_CLASS_INIT(&tag[0], "lit");
	else
		PAIR_CLASS_INIT(&tag[0], "none");

	/* 
	 * We want this to be inline-formatted, but needs to be div to
	 * accept block children. 
	 */
	bufcat_style(h, "display", "inline");
	SCALE_HS_INIT(&su, 1);
	/* Needs a left-margin for spacing. */
	bufcat_su(h, "margin-left", &su);
	PAIR_STYLE_INIT(&tag[1], h);
	print_otag(h, TAG_DIV, 2, tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_ms_pre(MDOC_ARGS)
{
	struct htmlpair	tag;

	PAIR_CLASS_INIT(&tag, "symb");
	print_otag(h, TAG_SPAN, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_igndelim_pre(MDOC_ARGS)
{

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


/* ARGSUSED */
static void
mdoc_pf_post(MDOC_ARGS)
{

	h->flags |= HTML_NOSPACE;
}


/* ARGSUSED */
static int
mdoc_rs_pre(MDOC_ARGS)
{
	struct htmlpair	 tag;

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

	if (n->prev && SEC_SEE_ALSO == n->sec)
		print_otag(h, TAG_P, 0, NULL);

	PAIR_CLASS_INIT(&tag, "ref");
	print_otag(h, TAG_SPAN, 1, &tag);
	return(1);
}



/* ARGSUSED */
static int
mdoc_li_pre(MDOC_ARGS)
{
	struct htmlpair	tag;

	PAIR_CLASS_INIT(&tag, "lit");
	print_otag(h, TAG_SPAN, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_sy_pre(MDOC_ARGS)
{
	struct htmlpair	tag;

	PAIR_CLASS_INIT(&tag, "symb");
	print_otag(h, TAG_SPAN, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc_bt_pre(MDOC_ARGS)
{

	print_text(h, "is currently in beta test.");
	return(0);
}


/* ARGSUSED */
static int
mdoc_ud_pre(MDOC_ARGS)
{

	print_text(h, "currently under development.");
	return(0);
}


/* ARGSUSED */
static int
mdoc_lb_pre(MDOC_ARGS)
{
	struct htmlpair	tag;

	if (SEC_LIBRARY == n->sec && MDOC_LINE & n->flags && n->prev)
		print_otag(h, TAG_BR, 0, NULL);

	PAIR_CLASS_INIT(&tag, "lib");
	print_otag(h, TAG_SPAN, 1, &tag);
	return(1);
}


/* ARGSUSED */
static int
mdoc__x_pre(MDOC_ARGS)
{
	struct htmlpair	tag[2];
	enum htmltag	t;

	t = TAG_SPAN;

	switch (n->tok) {
	case(MDOC__A):
		PAIR_CLASS_INIT(&tag[0], "ref-auth");
		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):
		PAIR_CLASS_INIT(&tag[0], "ref-book");
		t = TAG_I;
		break;
	case(MDOC__C):
		PAIR_CLASS_INIT(&tag[0], "ref-city");
		break;
	case(MDOC__D):
		PAIR_CLASS_INIT(&tag[0], "ref-date");
		break;
	case(MDOC__I):
		PAIR_CLASS_INIT(&tag[0], "ref-issue");
		t = TAG_I;
		break;
	case(MDOC__J):
		PAIR_CLASS_INIT(&tag[0], "ref-jrnl");
		t = TAG_I;
		break;
	case(MDOC__N):
		PAIR_CLASS_INIT(&tag[0], "ref-num");
		break;
	case(MDOC__O):
		PAIR_CLASS_INIT(&tag[0], "ref-opt");
		break;
	case(MDOC__P):
		PAIR_CLASS_INIT(&tag[0], "ref-page");
		break;
	case(MDOC__Q):
		PAIR_CLASS_INIT(&tag[0], "ref-corp");
		break;
	case(MDOC__R):
		PAIR_CLASS_INIT(&tag[0], "ref-rep");
		break;
	case(MDOC__T):
		PAIR_CLASS_INIT(&tag[0], "ref-title");
		break;
	case(MDOC__U):
		PAIR_CLASS_INIT(&tag[0], "link-ref");
		break;
	case(MDOC__V):
		PAIR_CLASS_INIT(&tag[0], "ref-vol");
		break;
	default:
		abort();
		/* NOTREACHED */
	}

	if (MDOC__U != n->tok) {
		print_otag(h, t, 1, tag);
		return(1);
	}

	PAIR_HREF_INIT(&tag[1], n->child->string);
	print_otag(h, TAG_A, 2, tag);

	return(1);
}


/* ARGSUSED */
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;

	print_text(h, n->next ? "," : ".");
}


/* ARGSUSED */
static int
mdoc_bk_pre(MDOC_ARGS)
{

	switch (n->type) {
	case (MDOC_BLOCK):
		break;
	case (MDOC_HEAD):
		return(0);
	case (MDOC_BODY):
		if (n->parent->args || 0 == n->prev->nchild)
			h->flags |= HTML_PREKEEP;
		break;
	default:
		abort();
		/* NOTREACHED */
	}

	return(1);
}


/* ARGSUSED */
static void
mdoc_bk_post(MDOC_ARGS)
{

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


/* ARGSUSED */
static int
mdoc_quote_pre(MDOC_ARGS)
{
	struct htmlpair	tag;

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

	switch (n->tok) {
	case (MDOC_Ao):
		/* FALLTHROUGH */
	case (MDOC_Aq):
		print_text(h, "\\(la");
		break;
	case (MDOC_Bro):
		/* FALLTHROUGH */
	case (MDOC_Brq):
		print_text(h, "\\(lC");
		break;
	case (MDOC_Bo):
		/* FALLTHROUGH */
	case (MDOC_Bq):
		print_text(h, "\\(lB");
		break;
	case (MDOC_Oo):
		/* FALLTHROUGH */
	case (MDOC_Op):
		print_text(h, "\\(lB");
		h->flags |= HTML_NOSPACE;
		PAIR_CLASS_INIT(&tag, "opt");
		print_otag(h, TAG_SPAN, 1, &tag);
		break;
	case (MDOC_Do):
		/* FALLTHROUGH */
	case (MDOC_Dq):
		/* FALLTHROUGH */
	case (MDOC_Qo):
		/* FALLTHROUGH */
	case (MDOC_Qq):
		print_text(h, "\\(lq");
		break;
	case (MDOC_Po):
		/* FALLTHROUGH */
	case (MDOC_Pq):
		print_text(h, "(");
		break;
	case (MDOC_Ql):
		/* FALLTHROUGH */
	case (MDOC_So):
		/* FALLTHROUGH */
	case (MDOC_Sq):
		print_text(h, "\\(oq");
		break;
	default:
		abort();
		/* NOTREACHED */
	}

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


/* ARGSUSED */
static void
mdoc_quote_post(MDOC_ARGS)
{

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

	h->flags |= HTML_NOSPACE;

	switch (n->tok) {
	case (MDOC_Ao):
		/* FALLTHROUGH */
	case (MDOC_Aq):
		print_text(h, "\\(ra");
		break;
	case (MDOC_Bro):
		/* FALLTHROUGH */
	case (MDOC_Brq):
		print_text(h, "\\(rC");
		break;
	case (MDOC_Oo):
		/* FALLTHROUGH */
	case (MDOC_Op):
		/* FALLTHROUGH */
	case (MDOC_Bo):
		/* FALLTHROUGH */
	case (MDOC_Bq):
		print_text(h, "\\(rB");
		break;
	case (MDOC_Qo):
		/* FALLTHROUGH */
	case (MDOC_Qq):
		/* FALLTHROUGH */
	case (MDOC_Do):
		/* FALLTHROUGH */
	case (MDOC_Dq):
		print_text(h, "\\(rq");
		break;
	case (MDOC_Po):
		/* FALLTHROUGH */
	case (MDOC_Pq):
		print_text(h, ")");
		break;
	case (MDOC_Ql):
		/* FALLTHROUGH */
	case (MDOC_So):
		/* FALLTHROUGH */
	case (MDOC_Sq):
		print_text(h, "\\(aq");
		break;
	default:
		abort();
		/* NOTREACHED */
	}
}