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2 7u83 1 
/*
6 7u83 2 
 * Copyright (c) 2002-2005 The TenDRA Project <http://www.tendra.org/>.
3 
 * All rights reserved.
4 
 *
5 
 * Redistribution and use in source and binary forms, with or without
6 
 * modification, are permitted provided that the following conditions are met:
7 
 *
8 
 * 1. Redistributions of source code must retain the above copyright notice,
9 
 *    this list of conditions and the following disclaimer.
10 
 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 
 *    this list of conditions and the following disclaimer in the documentation
12 
 *    and/or other materials provided with the distribution.
13 
 * 3. Neither the name of The TenDRA Project nor the names of its contributors
14 
 *    may be used to endorse or promote products derived from this software
15 
 *    without specific, prior written permission.
16 
 *
17 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
18 
 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
19 
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
21 
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 
 * EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 
 *
29 
 * $Id$
30 
 */
31 
/*
2 7u83 32 
    		 Crown Copyright (c) 1997
6 7u83 33 
 
2 7u83 34 
    This TenDRA(r) Computer Program is subject to Copyright
35 
    owned by the United Kingdom Secretary of State for Defence
36 
    acting through the Defence Evaluation and Research Agency
37 
    (DERA).  It is made available to Recipients with a
38 
    royalty-free licence for its use, reproduction, transfer
39 
    to other parties and amendment for any purpose not excluding
40 
    product development provided that any such use et cetera
41 
    shall be deemed to be acceptance of the following conditions:-
6 7u83 42 
 
2 7u83 43 
        (1) Its Recipients shall ensure that this Notice is
44 
        reproduced upon any copies or amended versions of it;
6 7u83 45 
 
2 7u83 46 
        (2) Any amended version of it shall be clearly marked to
47 
        show both the nature of and the organisation responsible
48 
        for the relevant amendment or amendments;
6 7u83 49 
 
2 7u83 50 
        (3) Its onward transfer from a recipient to another
51 
        party shall be deemed to be that party's acceptance of
52 
        these conditions;
6 7u83 53 
 
2 7u83 54 
        (4) DERA gives no warranty or assurance as to its
55 
        quality or suitability for any purpose and DERA accepts
56 
        no liability whatsoever in relation to any use to which
57 
        it may be put.
58 
*/
59 
 
60 
 
61 
/*** scope.c --- Scope stack ADT.
62 
 *
63 
 ** Author: Steve Folkes <smf@hermes.mod.uk>
64 
 *
65 
 *** Commentary:
66 
 *
67 
 * This file implements the scope stack manipulation routines.
68 
 *
69 
 *** Change Log:
70 
 * $Log: scope.c,v $
71 
 * Revision 1.1.1.1  1998/01/17  15:57:47  release
72 
 * First version to be checked into rolling release.
73 
 *
74 
 * Revision 1.2  1994/12/15  09:59:02  smf
75 
 * Brought into line with OSSG C Coding Standards Document, as per
76 
 * "CR94_178.sid+tld-update".
77 
 *
78 
 * Revision 1.1.1.1  1994/07/25  16:04:42  smf
79 
 * Initial import of SID 1.8 non shared files.
80 
 *
81 
**/
82 
 
83 
/****************************************************************************/
84 
 
85 
#include "scope.h"
86 
#include "gen-errors.h"
87 
#include "rule.h"
88 
 
89 
/*--------------------------------------------------------------------------*/
90 
 
91 
void
6 7u83 92 
scope_stack_init(ScopeStackP stack)
2 7u83 93 
{
6 7u83 94 
    stack->head = NIL(ScopeStackFrameP);
2 7u83 95 
}
96 
 
97 
void
6 7u83 98 
scope_stack_push(ScopeStackP stack, NStringP scope)
2 7u83 99 
{
6 7u83 100 
    ScopeStackFrameP frame = ALLOCATE(ScopeStackFrameT);
2 7u83 101 
    DStringT         dstring;
102 
 
6 7u83 103 
    dstring_init(&dstring);
2 7u83 104 
    if (frame->head) {
6 7u83 105 
	dstring_append_nstring(&dstring, &(stack->head->scope));
2 7u83 106 
    }
6 7u83 107 
    dstring_append_nstring(&dstring, scope);
108 
    dstring_append_cstring(&dstring, "::");
109 
    dstring_to_nstring(&dstring, &(frame->scope));
110 
    dstring_destroy(&dstring);
2 7u83 111 
    frame->next = stack->head;
6 7u83 112 
    frame->head = NIL(ScopeMapEntryP);
2 7u83 113 
    frame->tail = &(frame->head);
114 
    stack->head = frame;
115 
}
6 7u83 116 
 
2 7u83 117 
void
6 7u83 118 
scope_stack_pop(ScopeStackP stack)
2 7u83 119 
{
120 
    ScopeStackFrameP frame = stack->head;
121 
    ScopeMapEntryP   entry;
122 
    ScopeMapEntryP   next;
123 
 
6 7u83 124 
    ASSERT(frame);
2 7u83 125 
    stack->head = frame->next;
6 7u83 126 
    nstring_destroy(&(frame->scope));
2 7u83 127 
    for (entry = frame->head; entry; entry = next) {
128 
	next = entry->next;
6 7u83 129 
	DEALLOCATE(entry);
2 7u83 130 
    }
6 7u83 131 
    DEALLOCATE(frame);
2 7u83 132 
}
133 
 
134 
EntryP
6 7u83 135 
scope_stack_add_rule(ScopeStackP stack, TableP table, NStringP key, RuleP rule,
136 
		     BoolT *found_ref)
2 7u83 137 
{
138 
    *found_ref = FALSE;
139 
    if (stack->head) {
140 
	DStringT dstring;
141 
	NStringT nstring;
142 
	EntryP   entry;
143 
 
6 7u83 144 
	dstring_init(&dstring);
145 
	dstring_append_nstring(&dstring, &(stack->head->scope));
146 
	dstring_append_nstring(&dstring, key);
147 
	dstring_to_nstring(&dstring, &nstring);
148 
	dstring_destroy(&dstring);
149 
	if ((entry = table_get_rule(table, &nstring)) != NIL(EntryP)) {
2 7u83 150 
	    *found_ref = TRUE;
6 7u83 151 
	    nstring_destroy(&nstring);
152 
	    return(entry);
153 
	} else if ((entry = table_add_rule(table, &nstring)) !=
154 
		   NIL(EntryP)) {
155 
	    EntryP         from = table_add_name(table, key);
156 
	    ScopeMapEntryP map  = ALLOCATE(ScopeMapEntryT);
2 7u83 157 
 
6 7u83 158 
	   (void)scope_stack_check_shadowing(stack, from, rule);
159 
	    map->next            = NIL(ScopeMapEntryP);
2 7u83 160 
	    map->from            = from;
161 
	    map->to              = entry;
162 
	    *(stack->head->tail) = map;
163 
	    stack->head->tail    = &(map->next);
6 7u83 164 
	    return(entry);
2 7u83 165 
	} else {
6 7u83 166 
	    nstring_destroy(&nstring);
167 
	    return(NIL(EntryP));
2 7u83 168 
	}
169 
    } else {
6 7u83 170 
	if (table_get_rule(table, key)) {
2 7u83 171 
	    *found_ref = TRUE;
172 
	}
6 7u83 173 
	return(table_add_rule(table, key));
2 7u83 174 
    }
175 
}
176 
 
177 
EntryP
6 7u83 178 
scope_stack_add_action(ScopeStackP stack, TableP table, NStringP key,
179 
		       RuleP rule, BoolT *found_ref)
2 7u83 180 
{
181 
    *found_ref = FALSE;
182 
    if (stack->head) {
183 
	DStringT dstring;
184 
	NStringT nstring;
185 
	EntryP   entry;
186 
 
6 7u83 187 
	dstring_init(&dstring);
188 
	dstring_append_nstring(&dstring, &(stack->head->scope));
189 
	dstring_append_nstring(&dstring, key);
190 
	dstring_to_nstring(&dstring, &nstring);
191 
	dstring_destroy(&dstring);
192 
	if ((entry = table_get_action(table, &nstring)) != NIL(EntryP)) {
2 7u83 193 
	    *found_ref = TRUE;
6 7u83 194 
	    nstring_destroy(&nstring);
195 
	    return(entry);
196 
	} else if ((entry = table_add_action(table, &nstring)) !=
197 
		   NIL(EntryP)) {
198 
	    EntryP         from = table_add_name(table, key);
199 
	    ScopeMapEntryP map  = ALLOCATE(ScopeMapEntryT);
2 7u83 200 
 
6 7u83 201 
	   (void)scope_stack_check_shadowing(stack, from, rule);
202 
	    map->next            = NIL(ScopeMapEntryP);
2 7u83 203 
	    map->from            = from;
204 
	    map->to              = entry;
205 
	    *(stack->head->tail) = map;
206 
	    stack->head->tail    = &(map->next);
6 7u83 207 
	    return(entry);
2 7u83 208 
	} else {
6 7u83 209 
	    nstring_destroy(&nstring);
210 
	    return(NIL(EntryP));
2 7u83 211 
	}
212 
    } else {
6 7u83 213 
	if (table_get_action(table, key)) {
2 7u83 214 
	    *found_ref = TRUE;
215 
	}
6 7u83 216 
	return(table_add_action(table, key));
2 7u83 217 
    }
218 
}
219 
 
220 
EntryP
6 7u83 221 
scope_stack_add_non_local(ScopeStackP stack, TableP table, NStringP key,
222 
			  EntryP type, RuleP rule)
2 7u83 223 
{
224 
    DStringT dstring;
225 
    NStringT nstring;
226 
    EntryP   entry;
227 
 
6 7u83 228 
    ASSERT(stack->head);
229 
    dstring_init(&dstring);
230 
    dstring_append_nstring(&dstring, &(stack->head->scope));
231 
    dstring_append_nstring(&dstring, key);
232 
    dstring_to_nstring(&dstring, &nstring);
233 
    dstring_destroy(&dstring);
234 
    if ((entry = table_add_non_local(table, &nstring, type)) !=
235 
	NIL(EntryP)) {
236 
	EntryP         from = table_add_name(table, key);
237 
	ScopeMapEntryP map  = ALLOCATE(ScopeMapEntryT);
2 7u83 238 
 
6 7u83 239 
	(void)scope_stack_check_shadowing(stack, from, rule);
240 
	map->next            = NIL(ScopeMapEntryP);
2 7u83 241 
	map->from            = from;
242 
	map->to              = entry;
243 
	*(stack->head->tail) = map;
244 
	stack->head->tail    = &(map->next);
6 7u83 245 
	return(entry);
2 7u83 246 
    } else {
6 7u83 247 
	nstring_destroy(&nstring);
248 
	return(NIL(EntryP));
2 7u83 249 
    }
250 
}
251 
 
252 
EntryP
6 7u83 253 
scope_stack_get_rule(ScopeStackP stack, TableP table, NStringP key)
2 7u83 254 
{
6 7u83 255 
    EntryP entry = table_get_entry(table, key);
2 7u83 256 
 
257 
    if (entry) {
258 
	ScopeStackFrameP frame = stack->head;
259 
 
260 
	for (; frame; frame = frame->next) {
261 
	    ScopeMapEntryP map = frame->head;
262 
 
263 
	    for (; map; map = map->next) {
264 
		if (map->from == entry) {
6 7u83 265 
		    if (entry_is_rule(map->to)) {
266 
			return(map->to);
2 7u83 267 
		    } else {
6 7u83 268 
			return(NIL(EntryP));
2 7u83 269 
		    }
270 
		}
271 
	    }
272 
	}
6 7u83 273 
	if (entry_is_rule(entry)) {
274 
	    return(entry);
2 7u83 275 
	}
276 
    }
6 7u83 277 
    return(NIL(EntryP));
2 7u83 278 
}
279 
 
280 
EntryP
6 7u83 281 
scope_stack_get_action(ScopeStackP stack, TableP table, NStringP key)
2 7u83 282 
{
6 7u83 283 
    EntryP entry = table_get_entry(table, key);
2 7u83 284 
 
285 
    if (entry) {
286 
	ScopeStackFrameP frame = stack->head;
287 
 
288 
	for (; frame; frame = frame->next) {
289 
	    ScopeMapEntryP map = frame->head;
290 
 
291 
	    for (; map; map = map->next) {
292 
		if (map->from == entry) {
6 7u83 293 
		    if (entry_is_action(map->to)) {
294 
			return(map->to);
2 7u83 295 
		    } else {
6 7u83 296 
			return(NIL(EntryP));
2 7u83 297 
		    }
298 
		}
299 
	    }
300 
	}
6 7u83 301 
	if (entry_is_action(entry)) {
302 
	    return(entry);
2 7u83 303 
	}
304 
    }
6 7u83 305 
    return(NIL(EntryP));
2 7u83 306 
}
307 
 
308 
EntryP
6 7u83 309 
scope_stack_get_non_local(ScopeStackP stack, TableP table, NStringP key,
310 
			  NStringP scope)
2 7u83 311 
{
6 7u83 312 
    EntryP entry = table_get_entry(table, key);
2 7u83 313 
 
314 
    if (entry) {
315 
	ScopeStackFrameP frame = stack->head;
316 
 
317 
	for (; frame; frame = frame->next) {
318 
	    ScopeMapEntryP map = frame->head;
319 
 
320 
	    for (; map; map = map->next) {
321 
		if (map->from == entry) {
6 7u83 322 
		    if (entry_is_non_local(map->to)) {
323 
			nstring_copy(scope, &(frame->scope));
324 
			return(map->to);
2 7u83 325 
		    } else {
6 7u83 326 
			return(NIL(EntryP));
2 7u83 327 
		    }
328 
		}
329 
	    }
330 
	}
331 
    }
6 7u83 332 
    return(NIL(EntryP));
2 7u83 333 
}
334 
 
335 
BoolT
6 7u83 336 
scope_stack_check_shadowing(ScopeStackP stack, EntryP from, RuleP rule)
2 7u83 337 
{
338 
    ScopeStackFrameP frame = stack->head;
339 
 
340 
    for (; frame; frame = frame->next) {
341 
	ScopeMapEntryP entry;
342 
 
343 
	for (entry = frame->head; entry; entry = entry->next) {
344 
	    if (entry->from == from) {
6 7u83 345 
		E_shadows_non_local(entry_key(from), entry_key(entry->to),
2 7u83 346 
				     rule);
6 7u83 347 
		return(TRUE);
2 7u83 348 
	    }
349 
	}
350 
    }
6 7u83 351 
    if (entry_is_rule(from) || entry_is_action(from) ||
352 
	entry_is_basic(from)) {
353 
	E_shadows_global(entry_key(from), rule);
354 
	return(TRUE);
2 7u83 355 
    }
6 7u83 356 
    return(FALSE);
2 7u83 357 
}
358 
 
359 
/*
360 
 * Local variables(smf):
361 
 * eval: (include::add-path-entry "../os-interface" "../library")
362 
 * eval: (include::add-path-entry "../generated")
363 
 * end:
364 
**/