2 * Copyright (c) 2016-2017, Olivier MATZ <zer0@droids-corp.org>
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of the University of California, Berkeley nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 #include <ecoli_malloc.h>
38 #include <ecoli_log.h>
39 #include <ecoli_test.h>
40 #include <ecoli_strvec.h>
41 #include <ecoli_node.h>
42 #include <ecoli_parsed.h>
43 #include <ecoli_completed.h>
44 #include <ecoli_node_seq.h>
45 #include <ecoli_node_many.h>
46 #include <ecoli_node_or.h>
47 #include <ecoli_node_weakref.h>
48 #include <ecoli_node_expr.h>
54 struct ec_node *child;
56 /* the configuration nodes */
57 struct ec_node *val_node;
58 struct ec_node **bin_ops;
59 unsigned int bin_ops_len;
60 struct ec_node **pre_ops;
61 unsigned int pre_ops_len;
62 struct ec_node **post_ops;
63 unsigned int post_ops_len;
64 struct ec_node **open_ops;
65 struct ec_node **close_ops;
66 unsigned int paren_len;
69 static int ec_node_expr_parse(const struct ec_node *gen_node,
70 struct ec_parsed *state,
71 const struct ec_strvec *strvec)
73 struct ec_node_expr *node = (struct ec_node_expr *)gen_node;
75 return ec_node_parse_child(node->child, state, strvec);
78 static struct ec_completed *ec_node_expr_complete(const struct ec_node *gen_node,
79 struct ec_parsed *state,
80 const struct ec_strvec *strvec)
82 struct ec_node_expr *node = (struct ec_node_expr *)gen_node;
84 return ec_node_complete_child(node->child, state, strvec);
87 static void ec_node_expr_free_priv(struct ec_node *gen_node)
89 struct ec_node_expr *node = (struct ec_node_expr *)gen_node;
92 ec_log(EC_LOG_DEBUG, "free %p %p %p\n", node, node->child, node->val_node);
93 ec_node_free(node->val_node);
95 for (i = 0; i < node->bin_ops_len; i++)
96 ec_node_free(node->bin_ops[i]);
97 ec_free(node->bin_ops);
98 for (i = 0; i < node->pre_ops_len; i++)
99 ec_node_free(node->pre_ops[i]);
100 ec_free(node->pre_ops);
101 for (i = 0; i < node->post_ops_len; i++)
102 ec_node_free(node->post_ops[i]);
103 ec_free(node->post_ops);
104 for (i = 0; i < node->paren_len; i++) {
105 ec_node_free(node->open_ops[i]);
106 ec_node_free(node->close_ops[i]);
108 ec_free(node->open_ops);
109 ec_free(node->close_ops);
111 ec_node_free(node->child);
114 static int ec_node_expr_build(struct ec_node *gen_node)
116 struct ec_node_expr *node = (struct ec_node_expr *)gen_node;
117 struct ec_node *term = NULL, *expr = NULL, *next = NULL,
118 *pre_op = NULL, *post_op = NULL,
119 *post = NULL, *weak = NULL;
123 if (node->val_node == NULL)
125 if (node->bin_ops_len == 0 && node->pre_ops_len == 0 &&
126 node->post_ops_len == 0)
129 /* create the object, we will initialize it later: this is
130 * needed because we have a circular dependency */
132 weak = ec_node("weakref", "weak");
136 /* prefix unary operators */
137 pre_op = ec_node("or", "pre-op");
140 for (i = 0; i < node->pre_ops_len; i++) {
141 if (ec_node_or_add(pre_op, ec_node_clone(node->pre_ops[i])) < 0)
145 /* suffix unary operators */
146 post_op = ec_node("or", "post-op");
149 for (i = 0; i < node->post_ops_len; i++) {
150 if (ec_node_or_add(post_op, ec_node_clone(node->post_ops[i])) < 0)
154 post = ec_node("or", "post");
157 if (ec_node_or_add(post, ec_node_clone(node->val_node)) < 0)
159 if (ec_node_or_add(post,
161 ec_node_clone(pre_op),
162 ec_node_clone(weak))) < 0)
164 for (i = 0; i < node->paren_len; i++) {
165 if (ec_node_or_add(post, EC_NODE_SEQ(NULL,
166 ec_node_clone(node->open_ops[i]),
168 ec_node_clone(node->close_ops[i]))) < 0)
171 term = EC_NODE_SEQ("term",
173 ec_node_many(NULL, ec_node_clone(post_op), 0, 0)
178 for (i = 0; i < node->bin_ops_len; i++) {
179 next = EC_NODE_SEQ("next",
183 ec_node_clone(node->bin_ops[i]),
197 /* free the initial references */
198 ec_node_free(pre_op);
200 ec_node_free(post_op);
205 /* no need to clone here, the node is not consumed */
206 if (ec_node_weakref_set(weak, expr) < 0)
218 ec_node_free(pre_op);
219 ec_node_free(post_op);
226 static struct ec_node_type ec_node_expr_type = {
228 .build = ec_node_expr_build,
229 .parse = ec_node_expr_parse,
230 .complete = ec_node_expr_complete,
231 .size = sizeof(struct ec_node_expr),
232 .free_priv = ec_node_expr_free_priv,
235 EC_NODE_TYPE_REGISTER(ec_node_expr_type);
237 int ec_node_expr_set_val_node(struct ec_node *gen_node, struct ec_node *val_node)
239 struct ec_node_expr *node = (struct ec_node_expr *)gen_node;
243 if (val_node == NULL)
246 if (gen_node->flags & EC_NODE_F_BUILT)
249 if (node->val_node != NULL)
252 node->val_node = val_node;
253 gen_node->flags &= ~EC_NODE_F_BUILT;
258 ec_node_free(val_node);
262 /* add a binary operator */
263 int ec_node_expr_add_bin_op(struct ec_node *gen_node, struct ec_node *op)
265 struct ec_node_expr *node = (struct ec_node_expr *)gen_node;
266 struct ec_node **bin_ops;
269 // XXX check node type
272 if (node == NULL || op == NULL)
275 if (gen_node->flags & EC_NODE_F_BUILT)
279 bin_ops = ec_realloc(node->bin_ops,
280 (node->bin_ops_len + 1) * sizeof(*node->bin_ops));
284 node->bin_ops = bin_ops;
285 bin_ops[node->bin_ops_len] = op;
287 gen_node->flags &= ~EC_NODE_F_BUILT;
296 /* add a unary pre-operator */
297 int ec_node_expr_add_pre_op(struct ec_node *gen_node, struct ec_node *op)
299 struct ec_node_expr *node = (struct ec_node_expr *)gen_node;
300 struct ec_node **pre_ops;
303 // XXX check node type
306 if (node == NULL || op == NULL)
309 if (gen_node->flags & EC_NODE_F_BUILT)
313 pre_ops = ec_realloc(node->pre_ops,
314 (node->pre_ops_len + 1) * sizeof(*node->pre_ops));
318 node->pre_ops = pre_ops;
319 pre_ops[node->pre_ops_len] = op;
321 gen_node->flags &= ~EC_NODE_F_BUILT;
330 /* add a unary post-operator */
331 int ec_node_expr_add_post_op(struct ec_node *gen_node, struct ec_node *op)
333 struct ec_node_expr *node = (struct ec_node_expr *)gen_node;
334 struct ec_node **post_ops;
337 // XXX check node type
340 if (node == NULL || op == NULL)
343 if (gen_node->flags & EC_NODE_F_BUILT)
347 post_ops = ec_realloc(node->post_ops,
348 (node->post_ops_len + 1) * sizeof(*node->post_ops));
349 if (post_ops == NULL)
352 node->post_ops = post_ops;
353 post_ops[node->post_ops_len] = op;
354 node->post_ops_len++;
355 gen_node->flags &= ~EC_NODE_F_BUILT;
364 /* add parenthesis symbols */
365 int ec_node_expr_add_parenthesis(struct ec_node *gen_node,
366 struct ec_node *open, struct ec_node *close)
368 struct ec_node_expr *node = (struct ec_node_expr *)gen_node;
369 struct ec_node **open_ops, **close_ops;
372 // XXX check node type
375 if (node == NULL || open == NULL || close == NULL)
378 if (gen_node->flags & EC_NODE_F_BUILT)
382 open_ops = ec_realloc(node->open_ops,
383 (node->paren_len + 1) * sizeof(*node->open_ops));
384 if (open_ops == NULL)
386 close_ops = ec_realloc(node->close_ops,
387 (node->paren_len + 1) * sizeof(*node->close_ops));
388 if (close_ops == NULL)
391 node->open_ops = open_ops;
392 node->close_ops = close_ops;
393 open_ops[node->paren_len] = open;
394 close_ops[node->paren_len] = close;
396 gen_node->flags &= ~EC_NODE_F_BUILT;
406 enum expr_node_type {
415 static enum expr_node_type get_node_type(const struct ec_node *expr_gen_node,
416 const struct ec_node *check)
418 struct ec_node_expr *expr_node = (struct ec_node_expr *)expr_gen_node;
421 if (check == expr_node->val_node)
424 for (i = 0; i < expr_node->bin_ops_len; i++) {
425 if (check == expr_node->bin_ops[i])
428 for (i = 0; i < expr_node->pre_ops_len; i++) {
429 if (check == expr_node->pre_ops[i])
432 for (i = 0; i < expr_node->post_ops_len; i++) {
433 if (check == expr_node->post_ops[i])
437 for (i = 0; i < expr_node->paren_len; i++) {
438 if (check == expr_node->open_ops[i])
441 for (i = 0; i < expr_node->paren_len; i++) {
442 if (check == expr_node->close_ops[i])
452 const struct ec_parsed *op;
453 enum expr_node_type op_type;
456 /* merge x and y results in x */
457 static int merge_results(void *userctx,
458 const struct ec_node_expr_eval_ops *ops,
459 struct result *x, const struct result *y)
463 if (y->has_val == 0 && y->op == NULL)
465 if (x->has_val == 0 && x->op == NULL) {
470 if (x->has_val && y->has_val && y->op != NULL) {
471 if (y->op_type == BIN_OP) {
472 ret = ops->eval_bin_op(&x->val, userctx, x->val,
481 if (x->has_val == 0 && x->op != NULL && y->has_val && y->op == NULL) {
482 if (x->op_type == PRE_OP) {
483 ret = ops->eval_pre_op(&x->val, userctx, y->val, x->op);
490 } else if (x->op_type == BIN_OP) {
497 if (x->has_val && x->op == NULL && y->has_val == 0 && y->op != NULL) {
498 ret = ops->eval_post_op(&x->val, userctx, x->val, y->op);
505 assert(false); /* we should not get here */
509 static int eval_expression(struct result *result,
511 const struct ec_node_expr_eval_ops *ops,
512 const struct ec_node *expr_gen_node,
513 const struct ec_parsed *parsed)
516 struct ec_parsed *open = NULL, *close = NULL;
517 struct result child_result;
518 struct ec_parsed *child;
519 enum expr_node_type type;
522 memset(result, 0, sizeof(*result));
523 memset(&child_result, 0, sizeof(child_result));
525 type = get_node_type(expr_gen_node, parsed->node);
527 ret = ops->eval_var(&result->val, userctx, parsed);
531 } else if (type == PRE_OP || type == POST_OP || type == BIN_OP) {
533 result->op_type = type;
536 TAILQ_FOREACH(child, &parsed->children, next) {
538 type = get_node_type(expr_gen_node, child->node);
539 if (type == PAREN_OPEN) {
542 } else if (type == PAREN_CLOSE) {
547 ret = eval_expression(&child_result, userctx, ops,
548 expr_gen_node, child);
552 ret = merge_results(userctx, ops, result, &child_result);
556 memset(&child_result, 0, sizeof(child_result));
559 if (open != NULL && close != NULL) {
560 ret = ops->eval_parenthesis(&result->val, userctx, open, close,
570 ops->eval_free(result->val, userctx);
571 if (child_result.has_val)
572 ops->eval_free(child_result.val, userctx);
573 memset(result, 0, sizeof(*result));
578 int ec_node_expr_eval(void **user_result, const struct ec_node *node,
579 struct ec_parsed *parsed, const struct ec_node_expr_eval_ops *ops,
582 struct result result;
585 if (ops == NULL || ops->eval_var == NULL || ops->eval_pre_op == NULL ||
586 ops->eval_post_op == NULL || ops->eval_bin_op == NULL ||
587 ops->eval_parenthesis == NULL || ops->eval_free == NULL)
590 if (!ec_parsed_matches(parsed))
593 ec_parsed_dump(stdout, parsed); //XXX
594 ret = eval_expression(&result, userctx, ops, node, parsed);
598 assert(result.has_val);
599 assert(result.op == NULL);
600 *user_result = result.val;
605 /* the test case is in a separate file ecoli_node_expr_test.c */