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/*

 * Copyright (c) 2002-2005 The TenDRA Project <http://www.tendra.org/>.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 * 3. Neither the name of The TenDRA Project nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific, prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS

 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 * $Id$

 */

/*

    		 Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright

    owned by the United Kingdom Secretary of State for Defence

    acting through the Defence Evaluation and Research Agency

    (DERA).  It is made available to Recipients with a

    royalty-free licence for its use, reproduction, transfer

    to other parties and amendment for any purpose not excluding

    product development provided that any such use et cetera

    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is

        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to

        show both the nature of and the organisation responsible

        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another

        party shall be deemed to be that party's acceptance of

        these conditions;

        (4) DERA gives no warranty or assurance as to its

        quality or suitability for any purpose and DERA accepts

        no liability whatsoever in relation to any use to which

        it may be put.

*/

/**********************************************************************

$Author: release $

$Date: 1998/01/17 15:55:45 $

$Revision: 1.1.1.1 $

$Log: table_fns.c,v $

 * Revision 1.1.1.1  1998/01/17  15:55:45  release

 * First version to be checked into rolling release.

 *

 * Revision 1.2  1997/08/23  13:31:07  pwe

 * no invert order, and initial ANDF-DE

 *

 * Revision 1.1  1995/04/06  10:43:34  currie

 * Initial revision

 *

***********************************************************************/

#include "config.h"

#include "common_types.h"

#include "readglob.h"

#include "xalloc.h"

#include "basicread.h"

#include "sortmacs.h"

#include "exp.h"

#include "expmacs.h"

#include "main_reads.h"

#include "externs.h"

#include "spec_tok.h"

#include "read_sort.h"

#include "messages_r.h"

#include "installglob.h"

#include "install_fns.h"

#include "diagglob.h"

#include "dg_fns.h"

#include "check.h"

#include "table_fns.h"

/* VARIABLES */

/* The initial values are only to give something to push, jmf */

context *crt_context = (context *)0;

/* IDENTITY */

static tokformals_list nil_params;

/* PROCEDURES */

exp

get_lab(label l)

{

	/* find the exp which is labelled by l */

	context *con = crt_context;

	while (con != (context *)0) {

	   lab_con *lc = con->labs;

	   while (lc != (lab_con *)0) {

	   	if (lc->namel == l) {

			return lc->e;

		}

		lc = lc->rest;

	   }

	   con = con->outer;

	}

	return *l;

}

void

set_lab(label l, exp e)

{

	/* set the exp which is labelled by l */

	if (crt_context == (context *)0 || crt_context->recursive == 0) {

		*l = e;

	} else {

		lab_con *lc = (lab_con *)xmalloc(sizeof(lab_con));

		lc->namel = l; lc->e = e; lc->rest = crt_context->labs;

		crt_context->labs = lc;

	}

	return;

}

dec *

get_dec(int tg)

{

	/* find the tag declaration indexed by tg */

	dec *res = unit_ind_tags[tg];

	res->dec_u.dec_val.index = tg;

	return res;

}

aldef *

get_aldef(int tg)

{

	/* find the alignment tag value indexed by tg */

	return unit_ind_als[tg];

}

tok_define *

get_tok(int tk)

{

	/* find the token declaration indexed by tg */

	context *con = crt_context;

	while (con != (context *)0) {

		int n = con->no_toks;

		int nl = (n > LOCAL_TOKS) ? LOCAL_TOKS : n;

		tok_define *cbind = &con->loctoks[0];

		int i;

		for (i = 0; i < nl; i++) {

			if (tk == cbind[i].tdtoken) {

				return &cbind[i];

			}

		}

		cbind = con->othertoks;

		for (i = LOCAL_TOKS; i < n; i++) {

			if (tk == cbind[i - LOCAL_TOKS].tdtoken) {

				return &cbind[i-LOCAL_TOKS];

			}

		}

		con = con->outer;

	}

	return unit_ind_tokens[tk];

}

exp

get_tag(tag tg)

{

	/* find the exp known as tg */

	context *con = crt_context;

	while (con != (context *)0) {

		tag_con *tc = con->tags;

		while (tc != (tag_con *)0) {

			if (tc->namet == tg) {

				return tc->e;

			}

			tc = tc->rest;

		}

		con = con->outer;

	}

	return tg->dec_u.dec_val.dec_exp;

}

void

set_tag(tag tg, exp e)

{

	/* set the exp known as tg */

	if (crt_context == (context *)0 || crt_context->recursive == 0) {

		tg->dec_u.dec_val.dec_exp = e;

	} else {

		tag_con *tc = (tag_con *)xmalloc(sizeof(tag_con));

		tc->namet = tg; tc->e = e; tc->rest = crt_context->tags;

		crt_context->tags = tc;

	}

	return;

}

/* apply tk to its parameters in pars, and return the result */

tokval

apply_tok(token td, bitstream pars, int sortcode, tokval * actual_pars)

{

	if (td->tok_special || td -> defined == 0) {

		/* handle the special tokens */

		tokval tkv;

		int done = 0;

		tkv = special_token(td, pars, sortcode, &done);

		if (done) {

			return tkv;

		}

	}

	if (td->defined == 0) {

		/* detect various errors and give helpful information */

		failer(UNDEFINED_TOK);

		if (td->is_capsule_token &&

		    td->tok_index < capsule_no_of_tokens &&

		    td->tok_index >= 0 &&

		    td->tok_name != (char *)0) {

			IGNORE fprintf(stderr, "token is: %s\n",

				       td -> tok_name);

		} else {

			if (td->is_capsule_token &&

			    td->tok_index < capsule_no_of_tokens &&

			    td->tok_index >= 0) {

				IGNORE fprintf(stderr,

					       "capsule token number: %d\n",

					       td -> tok_index);

			} else {

				if (td->tok_index >= 0 &&

				    td->tok_index < unit_no_of_tokens) {

					IGNORE fprintf(stderr,

					    "local unit token number: %d\n",

					    td->tok_index);

				} else {

					IGNORE fprintf(stderr,

					    "token number out of bounds\n");

				}

			}

		}

		exit(EXIT_FAILURE);

	}

	{

		/* number of parameters */

		int npars = td->params.number;

		/* to construct the bindings for this expansion */

		context new_context;

		context *old_context = crt_context;

		tokval val;

		/* to record the current place in the input stream */

		place old_place;

		tok_define *new_bindings;

		int i, j;

		dec **old_tagtab;

		/* to remember the current tag table */

		exp *old_labtab;

		/* to remember the current label table */

		tok_define **old_toktab;

		/* to remember the current token table */

		aldef **old_altab;

		/* to remember the current alignment tag table */

		diag_tagdef **old_diagtab;		/* OLD DIAGS */

		dgtag_struct **old_dgtab;		/* NEW DIAGS */

		/* now remember them */

		old_tagtab = unit_ind_tags;

		old_labtab = unit_labtab;

		old_toktab = unit_ind_tokens;

		old_altab = unit_ind_als;

		old_diagtab = unit_ind_diagtags;	/* OLD DIAGS */

		old_dgtab = unit_ind_dgtags;		/* NEW DIAGS */

		new_context.no_toks = (short)npars;

		nil_params.number = 0;

		if (td -> valpresent &&

				(td -> unit_number == crt_tagdef_unit_no)) {

			/* if a value has already been computed (there

			 * will be no parameters) */

			if (sortcode == f_exp.code) {

				tokval v;

				v.tk_exp = copy(td->tdvalue.tk_exp);

				/* copy it if the result is an

				 * expression since we may be going to

				 * alter it */

				return v;

			} else  {

				return td -> tdvalue;

			}

		}

		/* remember the current input stream */

		old_place = keep_place();

		set_place(pars);

		/* now set up the new parameter bindings */

		if (npars > LOCAL_TOKS) {

			new_context.othertoks =

				(tok_define *)xcalloc(npars - LOCAL_TOKS,

						      sizeof(tok_define));

		}

		new_bindings = &new_context.loctoks[0];

		for (j = 0; j < npars; ++j) {

			/* read in the parameter values and bind them

			 * to the formals */

			sortname sn;

			exp old_crt_repeat;  /* XX008 */

			if (j >= LOCAL_TOKS) {

				i = j - LOCAL_TOKS;

				new_bindings = new_context.othertoks;

			} else {

				i = j;

			}

			sn = (td->params.par_sorts)[j];

			new_bindings[i].tdsort = sn;

			/* parameter sort */

			new_bindings[i].tdtoken =

				(td->params.par_names)[j];

			/* formal */

			new_bindings[i].valpresent = 1;

			/* the value is known */

			new_bindings[i].unit_number =

				crt_tagdef_unit_no;

			new_bindings[i].re_evaluate = 0;

			/* and does not need re-evaluating */

			new_bindings[i].params = nil_params;

			/* it has no parameters itself */

			/* XX008 */

			if (sn.code == f_exp.code) {

				old_crt_repeat = crt_repeat;

				crt_repeat = nilexp;

			} else {

				SET(old_crt_repeat);

			}

			if (actual_pars != (tokval*)0) {

				/* this is not used at present*/

				new_bindings[i].tdvalue =

					actual_pars[j];

			} else {

				new_bindings[i].tdvalue =

					read_sort(sn.code);

			}

			/* read a parameter */

			/* XX008 */

			if (sn.code == f_exp.code) {

				crt_repeat = old_crt_repeat;

			}

			new_bindings[i].defined = 1;

			/* and say it is defined */

			new_bindings[i].tok_special = 0;

			/* and say it is not special */

			new_bindings[i].recursive = (sn.code == TOKEN);

			/* and say it is not recursive for simple

			 * sorts */

			new_bindings[i].tok_context = crt_context;

		}

		/* set up the place to read the definition */

		set_place(td->tdplace);

		new_context.recursive = td->recursive;

		new_context.outer = td->tok_context;

		new_context.tags = (tag_con *)0;

		new_context.labs = (lab_con *)0;

		crt_context = &new_context;

		/* now set up the tables which belong to the place

		 * where the token was defined */

		unit_ind_tags = td->my_tagtab;

		unit_labtab = td->my_labtab;

		unit_ind_tokens = td->my_toktab;

		unit_ind_als = td->my_altab;

		unit_ind_diagtags = td->my_diagtab;	/* OLD DIAGS */

		unit_ind_dgtags = td->my_dgtab;		/* NEW DIAGS */

		/* read the body of the definition */

		td->recursive = 1;  /* set up to detect recursion */

		val = read_sort(sortcode);

		td->recursive = new_context.recursive;

		/* restore the place in the input stream */

		set_place(old_place);

		new_bindings = &new_context.loctoks[0];

		/* kill off exps (they were copied) */

		for (j = 0; j < npars; ++j) {

			tok_define *q;

			if (j >= LOCAL_TOKS) {

				i = j - LOCAL_TOKS;

				new_bindings = new_context.othertoks;

			} else {

				i = j;

			}

			q = &new_bindings[i];

			if (q->tdsort.code == f_exp.code) {

				exp ek = q->tdvalue.tk_exp;

				kill_exp(ek, ek);

			}

		}

		/* restore the old environment of tables */

		crt_context = old_context;

		unit_ind_tags = old_tagtab;

		unit_labtab = old_labtab;

		unit_ind_tokens = old_toktab;

		unit_ind_als = old_altab;

		unit_ind_diagtags = old_diagtab;	/* OLD DIAGS */

		unit_ind_dgtags = old_dgtab;		/* NEW DIAGS */

		if (!doing_aldefs && npars == 0 &&

				new_context.recursive == 0) {

			/* if there were no parameters, record the

			 * value for the next application of the

			 * token */

			td->valpresent = 1;

			td->tdvalue = val;

			if (sortcode == f_exp.code) {

				tokval v;

				v.tk_exp = copy(val.tk_exp);

				/* if we are remembering it we must

				 * copy, because the returned value

				 * might be altered */

				IGNORE hold(val.tk_exp);

				return v;

			}

		} else {

			if (npars > LOCAL_TOKS) {

				xfree((void *)new_context.othertoks);

				/* free the space used for parameter

				 * binding */

			}

		}

		while (new_context.tags != (tag_con *)0) {

			tag_con *r = new_context.tags;

			new_context.tags =

				new_context.tags->rest;

			xfree((void *)r);

		}

		while (new_context.labs != (lab_con *)0) {

			lab_con *r = new_context.labs;

			new_context.labs =

				new_context.labs->rest;

			xfree((void *)r);

		}

		return val;

	}

}