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In order to become able to generate syntax tree nodes on the roff(7)
level, validation must be separated from parsing and rewinding.
This first big step moves calling of the mdoc(7) post_*() functions
out of the parser loop into their own mdoc_validate() pass, while
using a new mdoc_state() module to make syntax tree state handling
available to both the parser loop and the validation pass.

/*	$Id: mdoc_state.c,v 1.1 2015/10/20 02:01:32 schwarze Exp $ */
/*
 * Copyright (c) 2014, 2015 Ingo Schwarze <schwarze@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE 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 <stdlib.h>
#include <string.h>

#include "mandoc.h"
#include "roff.h"
#include "mdoc.h"
#include "libmandoc.h"
#include "libmdoc.h"

#define STATE_ARGS  struct roff_man *mdoc, struct roff_node *n

typedef	void	(*state_handler)(STATE_ARGS);

static	void	 state_bd(STATE_ARGS);
static	void	 state_dl(STATE_ARGS);
static	void	 state_sh(STATE_ARGS);
static	void	 state_sm(STATE_ARGS);

static	const state_handler state_handlers[MDOC_MAX] = {
	NULL,		/* Ap */
	NULL,		/* Dd */
	NULL,		/* Dt */
	NULL,		/* Os */
	state_sh,	/* Sh */
	NULL,		/* Ss */
	NULL,		/* Pp */
	NULL,		/* D1 */
	state_dl,	/* Dl */
	state_bd,	/* Bd */
	NULL,		/* Ed */
	NULL,		/* Bl */
	NULL,		/* El */
	NULL,		/* It */
	NULL,		/* Ad */
	NULL,		/* An */
	NULL,		/* Ar */
	NULL,		/* Cd */
	NULL,		/* Cm */
	NULL,		/* Dv */
	NULL,		/* Er */
	NULL,		/* Ev */
	NULL,		/* Ex */
	NULL,		/* Fa */
	NULL,		/* Fd */
	NULL,		/* Fl */
	NULL,		/* Fn */
	NULL,		/* Ft */
	NULL,		/* Ic */
	NULL,		/* In */
	NULL,		/* Li */
	NULL,		/* Nd */
	NULL,		/* Nm */
	NULL,		/* Op */
	NULL,		/* Ot */
	NULL,		/* Pa */
	NULL,		/* Rv */
	NULL,		/* St */
	NULL,		/* Va */
	NULL,		/* Vt */
	NULL,		/* Xr */
	NULL,		/* %A */
	NULL,		/* %B */
	NULL,		/* %D */
	NULL,		/* %I */
	NULL,		/* %J */
	NULL,		/* %N */
	NULL,		/* %O */
	NULL,		/* %P */
	NULL,		/* %R */
	NULL,		/* %T */
	NULL,		/* %V */
	NULL,		/* Ac */
	NULL,		/* Ao */
	NULL,		/* Aq */
	NULL,		/* At */
	NULL,		/* Bc */
	NULL,		/* Bf */
	NULL,		/* Bo */
	NULL,		/* Bq */
	NULL,		/* Bsx */
	NULL,		/* Bx */
	NULL,		/* Db */
	NULL,		/* Dc */
	NULL,		/* Do */
	NULL,		/* Dq */
	NULL,		/* Ec */
	NULL,		/* Ef */
	NULL,		/* Em */
	NULL,		/* Eo */
	NULL,		/* Fx */
	NULL,		/* Ms */
	NULL,		/* No */
	NULL,		/* Ns */
	NULL,		/* Nx */
	NULL,		/* Ox */
	NULL,		/* Pc */
	NULL,		/* Pf */
	NULL,		/* Po */
	NULL,		/* Pq */
	NULL,		/* Qc */
	NULL,		/* Ql */
	NULL,		/* Qo */
	NULL,		/* Qq */
	NULL,		/* Re */
	NULL,		/* Rs */
	NULL,		/* Sc */
	NULL,		/* So */
	NULL,		/* Sq */
	state_sm,	/* Sm */
	NULL,		/* Sx */
	NULL,		/* Sy */
	NULL,		/* Tn */
	NULL,		/* Ux */
	NULL,		/* Xc */
	NULL,		/* Xo */
	NULL,		/* Fo */
	NULL,		/* Fc */
	NULL,		/* Oo */
	NULL,		/* Oc */
	NULL,		/* Bk */
	NULL,		/* Ek */
	NULL,		/* Bt */
	NULL,		/* Hf */
	NULL,		/* Fr */
	NULL,		/* Ud */
	NULL,		/* Lb */
	NULL,		/* Lp */
	NULL,		/* Lk */
	NULL,		/* Mt */
	NULL,		/* Brq */
	NULL,		/* Bro */
	NULL,		/* Brc */
	NULL,		/* %C */
	NULL,		/* Es */
	NULL,		/* En */
	NULL,		/* Dx */
	NULL,		/* %Q */
	NULL,		/* br */
	NULL,		/* sp */
	NULL,		/* %U */
	NULL,		/* Ta */
	NULL,		/* ll */
};


void
mdoc_state(struct roff_man *mdoc, struct roff_node *n)
{
	state_handler handler;

	if (n->tok == TOKEN_NONE)
		return;

	if ( ! (mdoc_macros[n->tok].flags & MDOC_PROLOGUE))
		mdoc->flags |= MDOC_PBODY;

	handler = state_handlers[n->tok];
	if (*handler)
		(*handler)(mdoc, n);
}

void
mdoc_state_reset(struct roff_man *mdoc)
{

	roff_setreg(mdoc->roff, "nS", 0, '=');
	mdoc->flags = 0;
}

static void
state_bd(STATE_ARGS)
{
	enum mdocargt arg;

	if (n->type != ROFFT_HEAD &&
	    (n->type != ROFFT_BODY || n->end != ENDBODY_NOT))
		return;

	arg = n->parent->args->argv[0].arg;
	if (arg != MDOC_Literal && arg != MDOC_Unfilled)
		return;

	state_dl(mdoc, n);
}

static void
state_dl(STATE_ARGS)
{

	switch (n->type) {
	case ROFFT_HEAD:
		mdoc->flags |= MDOC_LITERAL;
		break;
	case ROFFT_BODY:
		mdoc->flags &= ~MDOC_LITERAL;
		break;
	default:
		break;
	}
}

static void
state_sh(STATE_ARGS)
{
	struct roff_node *nch;
	char		 *secname;

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

	if ( ! (n->flags & MDOC_VALID)) {
		secname = NULL;
		deroff(&secname, n);

		/*
		 * Set the section attribute for the BLOCK, HEAD,
		 * and HEAD children; the latter can only be TEXT
		 * nodes, so no recursion is needed.  For other
		 * nodes, including the .Sh BODY, this is done
		 * when allocating the node data structures, but
		 * for .Sh BLOCK and HEAD, the section is still
		 * unknown at that time.
		 */

		n->sec = n->parent->sec = secname == NULL ?
		    SEC_CUSTOM : mdoc_a2sec(secname);
		for (nch = n->child; nch != NULL; nch = nch->next)
			nch->sec = n->sec;
		free(secname);
	}

	if ((mdoc->lastsec = n->sec) == SEC_SYNOPSIS) {
		roff_setreg(mdoc->roff, "nS", 1, '=');
		mdoc->flags |= MDOC_SYNOPSIS;
	} else {
		roff_setreg(mdoc->roff, "nS", 0, '=');
		mdoc->flags &= ~MDOC_SYNOPSIS;
	}
}

static void
state_sm(STATE_ARGS)
{

	if (n->child == NULL)
		mdoc->flags ^= MDOC_SMOFF;
	else if ( ! strcmp(n->child->string, "on"))
		mdoc->flags &= ~MDOC_SMOFF;
	else if ( ! strcmp(n->child->string, "off"))
		mdoc->flags |= MDOC_SMOFF;
}