Return to man_html.c CVS log

Up to [cvsweb.bsd.lv] / mandoc

Implement the man(7) .MR macro, a 2023 GNU extension.
The syntax and semantics is almost identical to mdoc(7) .Xr.

This will be needed for reading the groff manual pages once our port
will be updated to 1.23, and the Linux Manual Pages Project is also
determined to start using it sooner or later.  I did not advocate for
this new macro, but since we want to remain able to read all manual
pages found in the wild, there is little choice but to support it.
At least it is easy to do, they basically copied .Xr.

/* $Id: man_html.c,v 1.187 2023/10/24 20:53:12 schwarze Exp $ */
/*
 * Copyright (c) 2013-15,2017-20,2022-23 Ingo Schwarze <schwarze@openbsd.org>
 * Copyright (c) 2008-2012, 2014 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 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 man(7) used by mandoc(1).
 */
#include "config.h"

#include <sys/types.h>

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

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

#define	MAN_ARGS	  const struct roff_meta *man, \
			  struct roff_node *n, \
			  struct html *h

struct	man_html_act {
	int		(*pre)(MAN_ARGS);
	int		(*post)(MAN_ARGS);
};

static	void		  print_man_head(const struct roff_meta *,
				struct html *);
static	void		  print_man_nodelist(MAN_ARGS);
static	void		  print_man_node(MAN_ARGS);
static	char		  list_continues(const struct roff_node *,
				const struct roff_node *);
static	int		  man_B_pre(MAN_ARGS);
static	int		  man_IP_pre(MAN_ARGS);
static	int		  man_I_pre(MAN_ARGS);
static	int		  man_MR_pre(MAN_ARGS);
static	int		  man_OP_pre(MAN_ARGS);
static	int		  man_PP_pre(MAN_ARGS);
static	int		  man_RS_pre(MAN_ARGS);
static	int		  man_SH_pre(MAN_ARGS);
static	int		  man_SM_pre(MAN_ARGS);
static	int		  man_SY_pre(MAN_ARGS);
static	int		  man_UR_pre(MAN_ARGS);
static	int		  man_alt_pre(MAN_ARGS);
static	int		  man_ign_pre(MAN_ARGS);
static	int		  man_in_pre(MAN_ARGS);
static	void		  man_root_post(const struct roff_meta *,
				struct html *);
static	void		  man_root_pre(const struct roff_meta *,
				struct html *);

static	const struct man_html_act man_html_acts[MAN_MAX - MAN_TH] = {
	{ NULL, NULL }, /* TH */
	{ man_SH_pre, NULL }, /* SH */
	{ man_SH_pre, NULL }, /* SS */
	{ man_IP_pre, NULL }, /* TP */
	{ man_IP_pre, NULL }, /* TQ */
	{ man_PP_pre, NULL }, /* LP */
	{ man_PP_pre, NULL }, /* PP */
	{ man_PP_pre, NULL }, /* P */
	{ man_IP_pre, NULL }, /* IP */
	{ man_PP_pre, NULL }, /* HP */
	{ man_SM_pre, NULL }, /* SM */
	{ man_SM_pre, NULL }, /* SB */
	{ man_alt_pre, NULL }, /* BI */
	{ man_alt_pre, NULL }, /* IB */
	{ man_alt_pre, NULL }, /* BR */
	{ man_alt_pre, NULL }, /* RB */
	{ NULL, NULL }, /* R */
	{ man_B_pre, NULL }, /* B */
	{ man_I_pre, NULL }, /* I */
	{ man_alt_pre, NULL }, /* IR */
	{ man_alt_pre, NULL }, /* RI */
	{ NULL, NULL }, /* RE */
	{ man_RS_pre, NULL }, /* RS */
	{ man_ign_pre, NULL }, /* DT */
	{ man_ign_pre, NULL }, /* UC */
	{ man_ign_pre, NULL }, /* PD */
	{ man_ign_pre, NULL }, /* AT */
	{ man_in_pre, NULL }, /* in */
	{ man_SY_pre, NULL }, /* SY */
	{ NULL, NULL }, /* YS */
	{ man_OP_pre, NULL }, /* OP */
	{ NULL, NULL }, /* EX */
	{ NULL, NULL }, /* EE */
	{ man_UR_pre, NULL }, /* UR */
	{ NULL, NULL }, /* UE */
	{ man_UR_pre, NULL }, /* MT */
	{ NULL, NULL }, /* ME */
	{ man_MR_pre, NULL }, /* MR */
};


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

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

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

	man_root_pre(man, h);
	t = print_otag(h, TAG_MAIN, "c", "manual-text");
	print_man_nodelist(man, n, h);
	print_tagq(h, t);
	man_root_post(man, h);
	print_tagq(h, NULL);
}

static void
print_man_head(const struct roff_meta *man, struct html *h)
{
	char	*cp;

	print_gen_head(h);
	mandoc_asprintf(&cp, "%s(%s)", man->title, man->msec);
	print_otag(h, TAG_TITLE, "");
	print_text(h, cp);
	free(cp);
}

static void
print_man_nodelist(MAN_ARGS)
{
	while (n != NULL) {
		print_man_node(man, n, h);
		n = n->next;
	}
}

static void
print_man_node(MAN_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 &&
	    (n->prev == NULL || n->prev->tok != MAN_YS))
		print_endline(h);

	child = 1;
	switch (n->type) {
	case ROFFT_TEXT:
		if (*n->string == '\0') {
			print_endline(h);
			return;
		}
		if (*n->string == ' ' && n->flags & NODE_LINE &&
		    (h->flags & HTML_NONEWLINE) == 0)
			print_otag(h, TAG_BR, "");
		else if (n->flags & NODE_DELIMC)
			h->flags |= HTML_NOSPACE;
		t = h->tag;
		t->refcnt++;
		print_text(h, n->string);
		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 scope of font prior to opening a macro
		 * scope.
		 */
		if (h->metac != ESCAPE_FONTROMAN) {
			h->metal = h->metac;
			h->metac = ESCAPE_FONTROMAN;
		}

		/*
		 * 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);
		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 >= MAN_TH && n->tok < MAN_MAX);
		if (man_html_acts[n->tok - MAN_TH].pre != NULL)
			child = (*man_html_acts[n->tok - MAN_TH].pre)(man,
			    n, h);
		break;
	}

	if (child && n->child != NULL)
		print_man_nodelist(man, n->child, h);

	/* This will automatically close out any font scope. */
	t->refcnt--;
	if (n->type == ROFFT_BLOCK &&
	    (n->tok == MAN_IP || n->tok == MAN_TP || n->tok == MAN_TQ)) {
		t = h->tag;
		while (t->tag != TAG_DL && t->tag != TAG_UL)
			t = t->next;
		/*
		 * Close the list if no further item of the same type
		 * follows; otherwise, close the item only.
		 */
		if (list_continues(n, roff_node_next(n)) == '\0') {
			print_tagq(h, t);
			t = NULL;
		}
	}
	if (t != NULL)
		print_stagq(h, t);
}

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

	assert(man->title);
	assert(man->msec);
	mandoc_asprintf(&title, "%s(%s)", man->title, man->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");
	if (man->vol != NULL)
		print_text(h, man->vol);
	print_stagq(h, t);

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

static void
man_root_post(const struct roff_meta *man, struct html *h)
{
	struct tag	*t;

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

	print_otag(h, TAG_SPAN, "c", "foot-left");
	print_stagq(h, t);

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

	print_otag(h, TAG_SPAN, "c", "foot-os");
	if (man->os != NULL)
		print_text(h, man->os);
	print_tagq(h, t);
}

static int
man_SH_pre(MAN_ARGS)
{
	const char	*class;
	enum htmltag	 tag;

	if (n->tok == MAN_SH) {
		tag = TAG_H2;
		class = "Sh";
	} else {
		tag = TAG_H3;
		class = "Ss";
	}
	switch (n->type) {
	case ROFFT_BLOCK:
		html_close_paragraph(h);
		print_otag(h, TAG_SECTION, "c", class);
		break;
	case ROFFT_HEAD:
		print_otag_id(h, tag, class, n);
		break;
	case ROFFT_BODY:
		break;
	default:
		abort();
	}
	return 1;
}

static int
man_alt_pre(MAN_ARGS)
{
	const struct roff_node	*nn;
	struct tag	*t;
	int		 i;
	enum htmltag	 fp;

	for (i = 0, nn = n->child; nn != NULL; nn = nn->next, i++) {
		switch (n->tok) {
		case MAN_BI:
			fp = i % 2 ? TAG_I : TAG_B;
			break;
		case MAN_IB:
			fp = i % 2 ? TAG_B : TAG_I;
			break;
		case MAN_RI:
			fp = i % 2 ? TAG_I : TAG_MAX;
			break;
		case MAN_IR:
			fp = i % 2 ? TAG_MAX : TAG_I;
			break;
		case MAN_BR:
			fp = i % 2 ? TAG_MAX : TAG_B;
			break;
		case MAN_RB:
			fp = i % 2 ? TAG_B : TAG_MAX;
			break;
		default:
			abort();
		}

		if (i)
			h->flags |= HTML_NOSPACE;

		if (fp != TAG_MAX)
			t = print_otag(h, fp, "");

		print_text(h, nn->string);

		if (fp != TAG_MAX)
			print_tagq(h, t);
	}
	return 0;
}

static int
man_SM_pre(MAN_ARGS)
{
	print_otag(h, TAG_SMALL, "");
	if (n->tok == MAN_SB)
		print_otag(h, TAG_B, "");
	return 1;
}

static int
man_PP_pre(MAN_ARGS)
{
	switch (n->type) {
	case ROFFT_BLOCK:
		html_close_paragraph(h);
		break;
	case ROFFT_HEAD:
		return 0;
	case ROFFT_BODY:
		if (n->child != NULL &&
		    (n->child->flags & NODE_NOFILL) == 0)
			print_otag(h, TAG_P, "c",
			    n->tok == MAN_HP ? "Pp HP" : "Pp");
		break;
	default:
		abort();
	}
	return 1;
}

static char
list_continues(const struct roff_node *n1, const struct roff_node *n2)
{
	const char *s1, *s2;
	char c1, c2;

	if (n1 == NULL || n1->type != ROFFT_BLOCK ||
	    n2 == NULL || n2->type != ROFFT_BLOCK)
		return '\0';
	if ((n1->tok == MAN_TP || n1->tok == MAN_TQ) &&
	    (n2->tok == MAN_TP || n2->tok == MAN_TQ))
		return ' ';
	if (n1->tok != MAN_IP || n2->tok != MAN_IP)
		return '\0';
	n1 = n1->head->child;
	n2 = n2->head->child;
	s1 = n1 == NULL ? "" : n1->string;
	s2 = n2 == NULL ? "" : n2->string;
	c1 = strcmp(s1, "*") == 0 ? '*' :
	     strcmp(s1, "\\-") == 0 ? '-' :
	     strcmp(s1, "\\(bu") == 0 ? 'b' :
	     strcmp(s1, "\\[bu]") == 0 ? 'b' : ' ';
	c2 = strcmp(s2, "*") == 0 ? '*' :
	     strcmp(s2, "\\-") == 0 ? '-' :
	     strcmp(s2, "\\(bu") == 0 ? 'b' :
	     strcmp(s2, "\\[bu]") == 0 ? 'b' : ' ';
	return c1 != c2 ? '\0' : c1 == 'b' ? '*' : c1;
}

static int
man_IP_pre(MAN_ARGS)
{
	struct roff_node	*nn;
	const char		*list_class;
	enum htmltag		 list_elem, body_elem;
	char			 list_type;

	nn = n->type == ROFFT_BLOCK ? n : n->parent;
	list_type = list_continues(roff_node_prev(nn), nn);
	if (list_type == '\0') {
		/* Start a new list. */
		list_type = list_continues(nn, roff_node_next(nn));
		if (list_type == '\0')
			list_type = ' ';
		switch (list_type) {
		case ' ':
			list_class = "Bl-tag";
			list_elem = TAG_DL;
			break;
		case '*':
			list_class = "Bl-bullet";
			list_elem = TAG_UL;
			break;
		case '-':
			list_class = "Bl-dash";
			list_elem = TAG_UL;
			break;
		default:
			abort();
		}
	} else {
		/* Continue a list that was started earlier. */
		list_class = NULL;
		list_elem = TAG_MAX;
	}
	body_elem = list_type == ' ' ? TAG_DD : TAG_LI;

	switch (n->type) {
	case ROFFT_BLOCK:
		html_close_paragraph(h);
		if (list_elem != TAG_MAX)
			print_otag(h, list_elem, "c", list_class);
		return 1;
	case ROFFT_HEAD:
		if (body_elem == TAG_LI)
			return 0;
		print_otag_id(h, TAG_DT, NULL, n);
		break;
	case ROFFT_BODY:
		print_otag(h, body_elem, "");
		return 1;
	default:
		abort();
	}
	switch(n->tok) {
	case MAN_IP:  /* Only print the first header element. */
		if (n->child != NULL)
			print_man_node(man, n->child, h);
		break;
	case MAN_TP:  /* Only print next-line header elements. */
	case MAN_TQ:
		nn = n->child;
		while (nn != NULL && (NODE_LINE & nn->flags) == 0)
			nn = nn->next;
		while (nn != NULL) {
			print_man_node(man, nn, h);
			nn = nn->next;
		}
		break;
	default:
		abort();
	}
	return 0;
}

static int
man_MR_pre(MAN_ARGS)
{
	struct tag	*t;
	const char	*name, *section, *suffix;
	char		*label;

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

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

	free(label);
	if (name != NULL) {
		print_text(h, name);
		h->flags |= HTML_NOSPACE;
	}
	print_text(h, "(");
	h->flags |= HTML_NOSPACE;
	if (section != NULL) {
		print_text(h, section);
		h->flags |= HTML_NOSPACE;
	}
	print_text(h, ")");
	print_tagq(h, t);
	if (suffix != NULL) {
		h->flags |= HTML_NOSPACE;
		print_text(h, suffix);
	}
	return 0;
}

static int
man_OP_pre(MAN_ARGS)
{
	struct tag	*tt;

	print_text(h, "[");
	h->flags |= HTML_NOSPACE;
	tt = print_otag(h, TAG_SPAN, "c", "Op");

	if ((n = n->child) != NULL) {
		print_otag(h, TAG_B, "");
		print_text(h, n->string);
	}

	print_stagq(h, tt);

	if (n != NULL && n->next != NULL) {
		print_otag(h, TAG_I, "");
		print_text(h, n->next->string);
	}

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

static int
man_B_pre(MAN_ARGS)
{
	print_otag(h, TAG_B, "");
	return 1;
}

static int
man_I_pre(MAN_ARGS)
{
	print_otag(h, TAG_I, "");
	return 1;
}

static int
man_in_pre(MAN_ARGS)
{
	print_otag(h, TAG_BR, "");
	return 0;
}

static int
man_ign_pre(MAN_ARGS)
{
	return 0;
}

static int
man_RS_pre(MAN_ARGS)
{
	switch (n->type) {
	case ROFFT_BLOCK:
		html_close_paragraph(h);
		break;
	case ROFFT_HEAD:
		return 0;
	case ROFFT_BODY:
		print_otag(h, TAG_DIV, "c", "Bd-indent");
		break;
	default:
		abort();
	}
	return 1;
}

static int
man_SY_pre(MAN_ARGS)
{
	switch (n->type) {
	case ROFFT_BLOCK:
		html_close_paragraph(h);
		print_otag(h, TAG_TABLE, "c", "Nm");
		print_otag(h, TAG_TR, "");
		break;
	case ROFFT_HEAD:
		print_otag(h, TAG_TD, "");
		print_otag(h, TAG_CODE, "c", "Nm");
		break;
	case ROFFT_BODY:
		print_otag(h, TAG_TD, "");
		break;
	default:
		abort();
	}
	return 1;
}

static int
man_UR_pre(MAN_ARGS)
{
	char *cp;

	n = n->child;
	assert(n->type == ROFFT_HEAD);
	if (n->child != NULL) {
		assert(n->child->type == ROFFT_TEXT);
		if (n->tok == MAN_MT) {
			mandoc_asprintf(&cp, "mailto:%s", n->child->string);
			print_otag(h, TAG_A, "ch", "Mt", cp);
			free(cp);
		} else
			print_otag(h, TAG_A, "ch", "Lk", n->child->string);
	}

	assert(n->next->type == ROFFT_BODY);
	if (n->next->child != NULL)
		n = n->next;

	print_man_nodelist(man, n->child, h);
	return 0;
}