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The groff_man(7) manual says "the first line of text following" .TP is
used as a label, not "the first line following", so allow (some kinds of)
intervening macros - some people actually put macros in between.

On the other hand, when there is no text line before the next block macro,
that is, when the .TP block ends without any text line, then something *is*
broken, so still error out in that case.

/*	$Id: man_validate.c,v 1.12 2010/02/26 12:42:29 schwarze Exp $ */
/*
 * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
 *
 * 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.
 */
#include <sys/types.h>

#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdarg.h>
#include <stdlib.h>

#include "libman.h"
#include "libmandoc.h"

#define	CHKARGS	  struct man *m, const struct man_node *n

typedef	int	(*v_check)(CHKARGS);

struct	man_valid {
	v_check	 *pres;
	v_check	 *posts;
};

static	int	  check_bline(CHKARGS);
static	int	  check_eq0(CHKARGS);
static	int	  check_le1(CHKARGS);
static	int	  check_ge2(CHKARGS);
static	int	  check_le5(CHKARGS);
static	int	  check_par(CHKARGS);
static	int	  check_part(CHKARGS);
static	int	  check_root(CHKARGS);
static	int	  check_sec(CHKARGS);
static	int	  check_text(CHKARGS);

static	v_check	  posts_eq0[] = { check_eq0, NULL };
static	v_check	  posts_ge2_le5[] = { check_ge2, check_le5, NULL };
static	v_check	  posts_par[] = { check_par, NULL };
static	v_check	  posts_part[] = { check_part, NULL };
static	v_check	  posts_sec[] = { check_sec, NULL };
static	v_check	  posts_sp[] = { check_le1, NULL };
static	v_check	  pres_bline[] = { check_bline, NULL };

static	const struct man_valid man_valids[MAN_MAX] = {
	{ NULL, posts_eq0 }, /* br */
	{ pres_bline, posts_ge2_le5 }, /* TH */
	{ pres_bline, posts_sec }, /* SH */
	{ pres_bline, posts_sec }, /* SS */
	{ pres_bline, posts_par }, /* TP */
	{ pres_bline, posts_par }, /* LP */
	{ pres_bline, posts_par }, /* PP */
	{ pres_bline, posts_par }, /* P */
	{ pres_bline, posts_par }, /* IP */
	{ pres_bline, posts_par }, /* HP */
	{ NULL, NULL }, /* SM */
	{ NULL, NULL }, /* SB */
	{ NULL, NULL }, /* BI */
	{ NULL, NULL }, /* IB */
	{ NULL, NULL }, /* BR */
	{ NULL, NULL }, /* RB */
	{ NULL, NULL }, /* R */
	{ NULL, NULL }, /* B */
	{ NULL, NULL }, /* I */
	{ NULL, NULL }, /* IR */
	{ NULL, NULL }, /* RI */
	{ NULL, posts_eq0 }, /* na */
	{ NULL, NULL }, /* i */
	{ NULL, posts_sp }, /* sp */
	{ pres_bline, posts_eq0 }, /* nf */
	{ pres_bline, posts_eq0 }, /* fi */
	{ NULL, NULL }, /* r */
	{ NULL, NULL }, /* RE */
	{ NULL, posts_part }, /* RS */
	{ NULL, NULL }, /* DT */
	{ NULL, NULL }, /* UC */
	{ NULL, NULL }, /* PD */
};


int
man_valid_pre(struct man *m, const struct man_node *n)
{
	v_check		*cp;

	if (MAN_TEXT == n->type)
		return(1);
	if (MAN_ROOT == n->type)
		return(1);

	if (NULL == (cp = man_valids[n->tok].pres))
		return(1);
	for ( ; *cp; cp++)
		if ( ! (*cp)(m, n)) 
			return(0);
	return(1);
}


int
man_valid_post(struct man *m)
{
	v_check		*cp;

	if (MAN_VALID & m->last->flags)
		return(1);
	m->last->flags |= MAN_VALID;

	switch (m->last->type) {
	case (MAN_TEXT): 
		return(check_text(m, m->last));
	case (MAN_ROOT):
		return(check_root(m, m->last));
	default:
		break;
	}

	if (NULL == (cp = man_valids[m->last->tok].posts))
		return(1);
	for ( ; *cp; cp++)
		if ( ! (*cp)(m, m->last))
			return(0);

	return(1);
}


static int
check_root(CHKARGS) 
{

	if (MAN_BLINE & m->flags)
		return(man_nwarn(m, n, WEXITSCOPE));
	if (MAN_ELINE & m->flags)
		return(man_nwarn(m, n, WEXITSCOPE));

	m->flags &= ~MAN_BLINE;
	m->flags &= ~MAN_ELINE;

	if (NULL == m->first->child)
		return(man_nerr(m, n, WNODATA));
	if (NULL == m->meta.title)
		return(man_nerr(m, n, WNOTITLE));

	return(1);
}


static int
check_text(CHKARGS) 
{
	const char	*p;
	int		 pos, c;

	assert(n->string);

	for (p = n->string, pos = n->pos + 1; *p; p++, pos++) {
		if ('\\' == *p) {
			c = mandoc_special(p);
			if (c) {
				p += c - 1;
				pos += c - 1;
				continue;
			}
			if ( ! (MAN_IGN_ESCAPE & m->pflags))
				return(man_perr(m, n->line, pos, WESCAPE));
			if ( ! man_pwarn(m, n->line, pos, WESCAPE))
				return(0);
			continue;
		}

		if ('\t' == *p || isprint((u_char)*p)) 
			continue;

		if (MAN_IGN_CHARS & m->pflags)
			return(man_pwarn(m, n->line, pos, WNPRINT));
		return(man_perr(m, n->line, pos, WNPRINT));
	}

	return(1);
}


#define	INEQ_DEFINE(x, ineq, name) \
static int \
check_##name(CHKARGS) \
{ \
	if (n->nchild ineq (x)) \
		return(1); \
	return(man_verr(m, n->line, n->pos, \
			"expected line arguments %s %d, have %d", \
			#ineq, (x), n->nchild)); \
}

INEQ_DEFINE(0, ==, eq0)
INEQ_DEFINE(1, <=, le1)
INEQ_DEFINE(2, >=, ge2)
INEQ_DEFINE(5, <=, le5)


static int
check_sec(CHKARGS)
{

	if (MAN_BODY == n->type && 0 == n->nchild)
		return(man_nwarn(m, n, WBODYARGS));
	if (MAN_HEAD == n->type && 0 == n->nchild)
		return(man_nerr(m, n, WHEADARGS));
	return(1);
}


static int
check_part(CHKARGS)
{

	if (MAN_BODY == n->type && 0 == n->nchild)
		return(man_nwarn(m, n, WBODYARGS));
	return(1);
}


static int
check_par(CHKARGS)
{

	if (MAN_BODY == n->type) 
		switch (n->tok) {
		case (MAN_IP):
			/* FALLTHROUGH */
		case (MAN_HP):
			/* FALLTHROUGH */
		case (MAN_TP):
			/* Body-less lists are ok. */
			break;
		default:
			if (n->nchild)
				break;
			return(man_nwarn(m, n, WBODYARGS));
		}
	if (MAN_HEAD == n->type)
		switch (n->tok) {
		case (MAN_PP):
			/* FALLTHROUGH */
		case (MAN_P):
			/* FALLTHROUGH */
		case (MAN_LP):
			if (0 == n->nchild)
				break;
			return(man_nwarn(m, n, WNHEADARGS));
		default:
			if (n->nchild)
				break;
			return(man_nwarn(m, n, WHEADARGS));
		}

	return(1);
}


static int
check_bline(CHKARGS)
{

	assert( ! (MAN_ELINE & m->flags));
	if (MAN_BLINE & m->flags)
		return(man_nerr(m, n, WLNSCOPE));
	return(1);
}