root/usr.bin/mandoc/mdoc_html.c
/* $OpenBSD: mdoc_html.c,v 1.229 2025/06/26 16:59:35 schwarze Exp $ */
/*
 * Copyright (c) 2014-2022, 2025 Ingo Schwarze <schwarze@openbsd.org>
 * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2022 Anna Vyalkova <cyber@sysrq.in>
 *
 * 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.
 *
 * HTML formatter for mdoc(7) used by mandoc(1).
 */
#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  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 *, 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_code_pre(MDOC_ARGS);
static  int               mdoc_d1_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_ex_pre(MDOC_ARGS);
static  void              mdoc_fo_post(MDOC_ARGS);
static  int               mdoc_fo_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_lk_pre(MDOC_ARGS);
static  int               mdoc_mt_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_tg_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_code_pre, NULL}, /* Cm */
        {mdoc_code_pre, NULL}, /* Dv */
        {mdoc_code_pre, NULL}, /* Er */
        {mdoc_code_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_code_pre, NULL}, /* Ic */
        {mdoc_in_pre, NULL}, /* In */
        {mdoc_code_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_no_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 */
        {mdoc_tg_pre, NULL}, /* Tg */
};


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

        if ((n->flags & NODE_SYNPRETTY) == 0 ||
            (np = roff_node_prev(n)) == NULL)
                return;

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

        switch (np->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, "");
                t = print_otag(h, TAG_HEAD, "");
                print_mdoc_head(mdoc, h);
                print_tagq(h, t);
                if (n != NULL && n->type == ROFFT_COMMENT)
                        print_gen_comment(h, n);
                print_otag(h, TAG_BODY, "");
        }

        mdoc_root_pre(mdoc, h);
        t = print_otag(h, TAG_MAIN, "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;

        if ((n->flags & NODE_NOFILL) == 0)
                html_fillmode(h, ROFF_fi);
        else if (html_fillmode(h, ROFF_nf) == ROFF_nf &&
            n->tok != ROFF_fi && n->flags & NODE_LINE)
                print_endline(h);

        child = 1;
        n->flags &= ~NODE_ENDED;
        switch (n->type) {
        case ROFFT_TEXT:
                if (n->flags & NODE_LINE) {
                        switch (*n->string) {
                        case '\0':
                                h->col = 1;
                                print_endline(h);
                                return;
                        case ' ':
                                if ((h->flags & HTML_NONEWLINE) == 0 &&
                                    (n->flags & NODE_NOFILL) == 0)
                                        print_otag(h, TAG_BR, "");
                                break;
                        default:
                                break;
                        }
                }
                t = h->tag;
                t->refcnt++;
                if (n->flags & NODE_DELIMC)
                        h->flags |= HTML_NOSPACE;
                if (n->flags & NODE_HREF)
                        print_tagged_text(h, n->string, n);
                else
                        print_text(h, n->string);
                if (n->flags & NODE_DELIMO)
                        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;
        }
}

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

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

        t = print_otag(h, TAG_DIV, "cr?", "foot", "doc-pagefooter",
            "aria-label", "Manual footer line");

        print_otag(h, TAG_SPAN, "c", "foot-left");
        print_text(h, meta->os);
        print_stagq(h, t);

        print_otag(h, TAG_SPAN, "c", "foot-date");
        print_text(h, meta->date);
        print_stagq(h, t);

        print_otag(h, TAG_SPAN, "c", "foot-right");
        print_text(h, title);
        print_tagq(h, t);
        free(title);
}

static int
mdoc_root_pre(const struct roff_meta *meta, struct html *h)
{
        struct tag      *t;
        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_DIV, "cr?", "head", "doc-pageheader",
            "aria-label", "Manual header line");

        print_otag(h, TAG_SPAN, "c", "head-ltitle");
        print_text(h, title);
        print_stagq(h, t);

        print_otag(h, TAG_SPAN, "c", "head-vol");
        print_text(h, volume);
        print_stagq(h, t);

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

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

static int
mdoc_code_pre(MDOC_ARGS)
{
        print_otag_id(h, TAG_CODE, roff_name[n->tok], n);
        return 1;
}

static int
mdoc_sh_pre(MDOC_ARGS)
{
        struct roff_node        *sn, *subn;
        struct tag              *t, *tnav, *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) {
                        print_otag(h, TAG_SECTION, "c", "Sh");
                        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;
                tnav = print_otag(h, TAG_NAV, "r", "doc-toc");
                t = print_otag(h, TAG_H2, "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, tnav);
                print_otag(h, TAG_SECTION, "c", "Sh");
                break;
        case ROFFT_HEAD:
                print_otag_id(h, TAG_H2, "Sh", n);
                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)
{
        switch (n->type) {
        case ROFFT_BLOCK:
                html_close_paragraph(h);
                print_otag(h, TAG_SECTION, "c", "Ss");
                break;
        case ROFFT_HEAD:
                print_otag_id(h, TAG_H3, "Ss", n);
                break;
        case ROFFT_BODY:
                break;
        default:
                abort();
        }
        return 1;
}

static int
mdoc_fl_pre(MDOC_ARGS)
{
        struct roff_node        *nn;

        print_otag_id(h, TAG_CODE, "Fl", n);
        print_text(h, "\\-");
        if (n->child != NULL ||
            ((nn = roff_node_next(n)) != NULL &&
             nn->type != ROFFT_TEXT &&
             (nn->flags & NODE_LINE) == 0))
                h->flags |= HTML_NOSPACE;

        return 1;
}

static int
mdoc_nd_pre(MDOC_ARGS)
{
        switch (n->type) {
        case ROFFT_BLOCK:
                return 1;
        case ROFFT_HEAD:
                return 0;
        case ROFFT_BODY:
                break;
        default:
                abort();
        }
        print_text(h, "\\(em");
        print_otag(h, TAG_SPAN, "cr", "Nd", "doc-subtitle");
        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)
{
        char    *name, *section, *label;

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

        name = n->child->string;
        if (n->child->next != NULL) {
                section = n->child->next->string;
                mandoc_asprintf(&label, "%s, section %s", name, section);
        } else
                section = label = NULL;

        if (h->base_man1)
                print_otag(h, TAG_A, "chM?", "Xr",
                    name, section, "aria-label", label);
        else
                print_otag(h, TAG_A, "c?", "Xr", "aria-label", label);

        free(label);
        print_text(h, name);

        if (section == NULL)
                return 0;

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

static int
mdoc_tg_pre(MDOC_ARGS)
{
        char    *id;

        if ((id = html_make_id(n, 1)) != NULL) {
                print_tagq(h, print_otag(h, TAG_MARK, "i", id));
                free(id);
        }
        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_id(h, TAG_LI, NULL, n);
                        break;
                default:
                        break;
                }
                break;
        case LIST_diag:
        case LIST_hang:
        case LIST_inset:
        case LIST_ohang:
                switch (n->type) {
                case ROFFT_HEAD:
                        print_otag_id(h, TAG_DT, NULL, n);
                        break;
                case ROFFT_BODY:
                        print_otag(h, TAG_DD, "");
                        break;
                default:
                        break;
                }
                break;
        case LIST_tag:
                switch (n->type) {
                case ROFFT_HEAD:
                        print_otag_id(h, TAG_DT, NULL, n);
                        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_id(h, TAG_TR, NULL, n);
                }
        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_id(h, TAG_DL,
                    bl->comp ? "Bl-tag Bl-compact" : "Bl-tag", n->body);
                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_id(h, elemtype, cattr, n->body);
        return 1;
}

static int
mdoc_ex_pre(MDOC_ARGS)
{
        if (roff_node_prev(n) != NULL)
                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_id(h, TAG_I, "Em", n);
        return 1;
}

static int
mdoc_d1_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_otag_id(h, TAG_DIV, "Bd Bd-indent", n);
        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[20];
        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 (roff_node_prev(nn) != 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));

        if (n->norm->Bd.type == DISP_literal)
                (void)strlcat(buf, " Li", sizeof(buf));

        print_otag_id(h, TAG_DIV, buf, n);
        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_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 != NULL; nn = nn->next) {
                t = print_otag(h, TAG_VAR, "c", "Fa");
                print_text(h, nn->string);
                print_tagq(h, t);
                if (nn->next != NULL) {
                        h->flags |= HTML_NOSPACE;
                        print_text(h, ",");
                }
        }
        if (n->child != NULL &&
            (nn = roff_node_next(n)) != NULL &&
            nn->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_id(h, TAG_CODE, "Fn", n);

        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)
{
        char    *id;

        if (n->flags & NODE_NOFILL) {
                print_endline(h);
                if (n->flags & NODE_ID)
                        mdoc_tg_pre(meta, n, h);
                else {
                        h->col = 1;
                        print_endline(h);
                }
        } else {
                html_close_paragraph(h);
                id = n->flags & NODE_ID ? html_make_id(n, 1) : NULL;
                print_otag(h, TAG_P, "ci", "Pp", id);
                free(id);
        }
        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;

        switch (n->type) {
        case ROFFT_BLOCK:
                synopsis_pre(h, n);
                return 1;
        case ROFFT_HEAD:
                if (n->child != NULL) {
                        t = print_otag_id(h, TAG_CODE, "Fn", n);
                        print_text(h, n->child->string);
                        print_tagq(h, t);
                }
                return 0;
        case ROFFT_BODY:
                h->flags |= HTML_NOSPACE;
                print_text(h, "(");
                h->flags |= HTML_NOSPACE;
                return 1;
        default:
                abort();
        }
}

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_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_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_SPAN, "c", "Rs");
                break;
        default:
                abort();
        }
        return 1;
}

static int
mdoc_no_pre(MDOC_ARGS)
{
        print_otag_id(h, TAG_SPAN, roff_name[n->tok], n);
        return 1;
}

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

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

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

static int
mdoc__x_pre(MDOC_ARGS)
{
        struct roff_node        *nn;
        const unsigned char     *cp;
        const char              *cattr, *arg;
        char                    *url;
        enum htmltag             t;

        t = TAG_SPAN;
        arg = n->child->string;

        switch (n->tok) {
        case MDOC__A:
                cattr = "RsA";
                if ((nn = roff_node_prev(n)) != NULL && nn->tok == MDOC__A &&
                    ((nn = roff_node_next(n)) == NULL || nn->tok != MDOC__A))
                        print_text(h, "and");
                break;
        case MDOC__B:
                t = TAG_CITE;
                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:
                if (strncmp(arg, "RFC ", 4) == 0) {
                        cp = arg += 4;
                        while (isdigit(*cp))
                                cp++;
                        if (*cp == '\0') {
                                mandoc_asprintf(&url, "https://www.rfc-"
                                    "editor.org/rfc/rfc%s.html", arg);
                                print_otag(h, TAG_A, "ch", "RsR", url);
                                free(url);
                                return 1;
                        }
                }
                cattr = "RsR";
                break;
        case MDOC__T:
                t = TAG_CITE;
                if (n->parent != NULL && n->parent->tok == MDOC_Rs &&
                    n->parent->norm->Rs.quote_T) {
                        print_text(h, "\\(lq");
                        h->flags |= HTML_NOSPACE;
                        cattr = "RsT";
                } else
                        cattr = "RsB";
                break;
        case MDOC__U:
                print_otag(h, TAG_A, "ch", "RsU", arg);
                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)
{
        struct roff_node *nn;

        switch (n->tok) {
        case MDOC__A:
                if ((nn = roff_node_next(n)) != NULL && nn->tok == MDOC__A &&
                    ((nn = roff_node_next(nn)) == NULL || nn->tok != MDOC__A) &&
                    ((nn = roff_node_prev(n)) == NULL || nn->tok != MDOC__A))
                        return;
                break;
        case MDOC__T:
                if (n->parent != NULL && n->parent->tok == MDOC_Rs &&
                    n->parent->norm->Rs.quote_T) {
                        h->flags |= HTML_NOSPACE;
                        print_text(h, "\\(rq");
                }
                break;
        default:
                break;
        }
        if (n->parent == NULL || n->parent->tok != MDOC_Rs)
                return;

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

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_DIV 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:
                print_text(h, "\\(lq");
                break;
        case MDOC_Qo:
        case MDOC_Qq:
                print_text(h, "\"");
                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_Do:
        case MDOC_Dq:
                print_text(h, "\\(rq");
                break;
        case MDOC_Qo:
        case MDOC_Qq:
                print_text(h, "\"");
                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();
}