expr.c 24.9 KB
Newer Older
Miguel de Icaza's avatar
Miguel de Icaza committed
1 2 3 4 5 6
/*
 * expr.c: Expression evaluation in Gnumeriuc
 *
 * Author:
 *   Miguel de Icaza (miguel@gnu.org).
 */
7
#include <config.h>
Arturo Espinosa's avatar
Arturo Espinosa committed
8
#include <gnome.h>
Arturo Espinosa's avatar
Arturo Espinosa committed
9
#include <math.h>
10
#include <string.h>
Arturo Espinosa's avatar
Arturo Espinosa committed
11
#include "gnumeric.h"
Arturo Espinosa's avatar
Arturo Espinosa committed
12
#include "expr.h"
Arturo Espinosa's avatar
Arturo Espinosa committed
13
#include "eval.h"
Miguel de Icaza's avatar
Today:  
Miguel de Icaza committed
14
#include "format.h"
15
#include "func.h"
16

Miguel de Icaza's avatar
New:  
Miguel de Icaza committed
17 18 19 20 21 22 23 24 25 26 27 28
/* Shared variables with parser.y */

/*       The expression being parsed */
char     *parser_expr;

/*        The suggested format to use for this expression */
char     *parser_desired_format;

/*        The error returned from the */
ParseErr  parser_error;

/*        The expression tree returned from the parser */
29
ExprTree *parser_result;
Miguel de Icaza's avatar
New:  
Miguel de Icaza committed
30

31 32 33
/*        The sheet where the parsing takes place */
void     *parser_sheet;

Miguel de Icaza's avatar
New:  
Miguel de Icaza committed
34 35
/*        Location where the parsing is taking place */
int       parser_col, parser_row;
36

37
ExprTree *
38
expr_parse_string (char *expr, void *sheet, int col, int row, char **desired_format, char **error_msg)
39
{
40 41 42
	g_return_val_if_fail (expr != NULL, NULL);
	
	parser_expr  = expr;
43
	parser_error = PARSE_OK;
44 45 46
	parser_col   = col;
	parser_row   = row;
	parser_sheet = sheet;
Miguel de Icaza's avatar
New:  
Miguel de Icaza committed
47 48
	parser_desired_format = NULL;
	
49
	yyparse ();
50 51 52
	switch (parser_error){
	case PARSE_OK:
		*error_msg = NULL;
Miguel de Icaza's avatar
New:  
Miguel de Icaza committed
53 54
		if (desired_format)
			*desired_format = parser_desired_format;
55
		parser_result->ref_count = 1;
Arturo Espinosa's avatar
Arturo Espinosa committed
56
		return parser_result;
57

Arturo Espinosa's avatar
Arturo Espinosa committed
58 59 60 61
	case PARSE_ERR_SYNTAX:
		*error_msg = _("Syntax error");
		break;
			
62 63 64
	case PARSE_ERR_NO_QUOTE:
		*error_msg = _("Missing quote");
		break;
65
	default:
Arturo Espinosa's avatar
Arturo Espinosa committed
66 67 68
		g_assert_not_reached ();
		*error_msg = _("Impossible!");
		break;
69
	}
70 71 72
	return NULL;
}

Arturo Espinosa's avatar
Arturo Espinosa committed
73 74
static void
do_expr_tree_ref (ExprTree *tree)
75
{
76
	g_return_if_fail (tree != NULL);
Arturo Espinosa's avatar
Arturo Espinosa committed
77 78 79
	g_return_if_fail (tree->ref_count > 0);

	tree->ref_count++;
80
	switch (tree->oper){
81 82 83
	case OPER_VAR:
	case OPER_CONSTANT:
	case OPER_FUNCALL:
84 85
		break;

86 87 88 89 90 91 92 93 94 95 96 97
	case OPER_EQUAL:
	case OPER_GT:
	case OPER_LT:
	case OPER_GTE:
	case OPER_LTE:
	case OPER_NOT_EQUAL:
	case OPER_ADD:
	case OPER_SUB:
	case OPER_MULT:
	case OPER_DIV:
	case OPER_EXP:
	case OPER_CONCAT:
Arturo Espinosa's avatar
Arturo Espinosa committed
98 99
		do_expr_tree_ref (tree->u.binary.value_a);
		do_expr_tree_ref (tree->u.binary.value_b);
100 101
		break;

102
	case OPER_NEG:
Arturo Espinosa's avatar
Arturo Espinosa committed
103
		do_expr_tree_ref (tree->u.value);
104 105 106 107
		break;
	}
}

Arturo Espinosa's avatar
Arturo Espinosa committed
108 109 110 111
/*
 * expr_tree_ref:
 * Increments the ref_count for part of a tree
 */
112 113 114 115 116 117
void
expr_tree_ref (ExprTree *tree)
{
	g_return_if_fail (tree != NULL);
	g_return_if_fail (tree->ref_count > 0);

Arturo Espinosa's avatar
Arturo Espinosa committed
118 119 120 121 122 123 124 125
	do_expr_tree_ref (tree);
}

static void
do_expr_tree_unref (ExprTree *tree)
{
	tree->ref_count--;
	switch (tree->oper){
126
	case OPER_VAR:
Arturo Espinosa's avatar
Arturo Espinosa committed
127 128
		break;
		
129
	case OPER_CONSTANT:
Arturo Espinosa's avatar
Arturo Espinosa committed
130 131 132 133
		if (tree->ref_count == 0)
			value_release (tree->u.constant);
		break;
		
134
	case OPER_FUNCALL:
Arturo Espinosa's avatar
Arturo Espinosa committed
135 136 137 138
		if (tree->ref_count == 0)
			symbol_unref (tree->u.function.symbol);
		break;

139 140 141 142 143 144 145 146 147 148 149 150
	case OPER_EQUAL:
	case OPER_GT:
	case OPER_LT:
	case OPER_GTE:
	case OPER_LTE:
	case OPER_NOT_EQUAL:
	case OPER_ADD:
	case OPER_SUB:
	case OPER_MULT:
	case OPER_DIV:
	case OPER_EXP:
	case OPER_CONCAT:
Arturo Espinosa's avatar
Arturo Espinosa committed
151 152 153 154
		do_expr_tree_unref (tree->u.binary.value_a);
		do_expr_tree_unref (tree->u.binary.value_b);
		break;

155
	case OPER_NEG:
Arturo Espinosa's avatar
Arturo Espinosa committed
156 157 158 159 160 161
		do_expr_tree_unref (tree->u.value);
		break;
	}
	
	if (tree->ref_count == 0)
		g_free (tree);
162 163 164 165 166 167 168 169
}

void
expr_tree_unref (ExprTree *tree)
{
	g_return_if_fail (tree != NULL);
	g_return_if_fail (tree->ref_count > 0);

Arturo Espinosa's avatar
Arturo Espinosa committed
170
	do_expr_tree_unref (tree);
171 172
}

Miguel de Icaza's avatar
Today:  
Miguel de Icaza committed
173 174 175 176 177 178 179 180 181 182 183
/*
 * simplistic value rendering
 */
char *
value_string (Value *value)
{
	switch (value->type){
	case VALUE_STRING:
		return g_strdup (value->v.str->str);

	case VALUE_INTEGER:
Arturo Espinosa's avatar
Arturo Espinosa committed
184
		return g_strdup_printf ("%d", value->v.v_int);
Miguel de Icaza's avatar
Today:  
Miguel de Icaza committed
185 186

	case VALUE_FLOAT:
Arturo Espinosa's avatar
Arturo Espinosa committed
187
		return g_strdup_printf ("%g", value->v.v_float);
Miguel de Icaza's avatar
Today:  
Miguel de Icaza committed
188 189

	case VALUE_ARRAY:
Arturo Espinosa's avatar
Arturo Espinosa committed
190
		return g_strdup ("ARRAY");
Miguel de Icaza's avatar
Today:  
Miguel de Icaza committed
191 192
		
	case VALUE_CELLRANGE:
Arturo Espinosa's avatar
Arturo Espinosa committed
193
		break;
Miguel de Icaza's avatar
Today:  
Miguel de Icaza committed
194
	}
195

Arturo Espinosa's avatar
Arturo Espinosa committed
196
	return g_strdup ("Internal problem");
Miguel de Icaza's avatar
Today:  
Miguel de Icaza committed
197 198
}

199 200 201
void
value_release (Value *value)
{
Arturo Espinosa's avatar
Arturo Espinosa committed
202 203
	g_return_if_fail (value != NULL);
	
204 205 206 207 208 209 210
	switch (value->type){
	case VALUE_STRING:
		string_unref (value->v.str);
		break;

	case VALUE_INTEGER:
		mpz_clear (value->v.v_int);
211 212
		break;
		
213 214 215 216
	case VALUE_FLOAT:
		mpf_clear (value->v.v_float);
		break;

Arturo Espinosa's avatar
Arturo Espinosa committed
217 218 219 220 221 222 223 224 225 226
	case VALUE_ARRAY: {
		GList *l;

		for (l = value->v.array; l; l = l->next)
			value_release (l->data);
		g_list_free (l);
	}
	
	case VALUE_CELLRANGE:
		break;
227

228
	}
Arturo Espinosa's avatar
Arturo Espinosa committed
229
	g_free (value);
230
}
231

Arturo Espinosa's avatar
Arturo Espinosa committed
232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256
/*
 * Copies a Value.
 */
void
value_copy_to (Value *dest, Value *source)
{
	g_return_if_fail (dest != NULL);
	g_return_if_fail (source != NULL);

	dest->type = source->type;
	
	switch (source->type){
	case VALUE_STRING:
		dest->v.str = source->v.str;
		string_ref (dest->v.str);
		break;

	case VALUE_INTEGER:
		dest->v.v_int = source->v.v_int;
		break;

	case VALUE_FLOAT:
		dest->v.v_float = source->v.v_float;
		break;

Arturo Espinosa's avatar
Arturo Espinosa committed
257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272
	case VALUE_ARRAY: {
		GList *l, *new = NULL;

		for (l = source->v.array; l; l = l->next){
			Value *copy;

			copy = value_duplicate (l->data);
			
			new = g_list_append (new, copy);
		}
		dest->v.array = new;
		break;
	}
	case VALUE_CELLRANGE:
		dest->v.cell_range = source->v.cell_range;
		break;
Arturo Espinosa's avatar
Arturo Espinosa committed
273 274 275
	}
}

Arturo Espinosa's avatar
Arturo Espinosa committed
276 277 278 279 280 281 282 283 284 285 286 287 288 289 290
/*
 * Makes a copy of a Value
 */
Value *
value_duplicate (Value *value)
{
	Value *new_value;

	g_return_val_if_fail (value != NULL, NULL);
	new_value = g_new (Value, 1);
	value_copy_to (new_value, value);
	
	return new_value;
}

291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312
Value *
value_float (float_t f)
{
	Value *v = g_new (Value, 1);

	v->type = VALUE_FLOAT;
	v->v.v_float = f;

	return v;
}

Value *
value_int (int i)
{
	Value *v = g_new (Value, 1);

	v->type = VALUE_INTEGER;
	v->v.v_int = i;

	return v;
}

313 314 315 316 317 318 319 320 321 322 323
Value *
value_str (char *str)
{
	Value *v = g_new (Value, 1);

	v->type = VALUE_STRING;
	v->v.str = string_get (str);

	return v;
}

Arturo Espinosa's avatar
Arturo Espinosa committed
324 325 326 327
/*
 * Casts a value to float if it is integer, and returns
 * a new Value * if required
 */
328
Value *
329
value_cast_to_float (Value *v)
Arturo Espinosa's avatar
Arturo Espinosa committed
330 331 332 333 334 335 336
{
	Value *newv;
	
	g_return_val_if_fail (VALUE_IS_NUMBER (v), NULL);

	if (v->type == VALUE_FLOAT)
		return v;
337

Arturo Espinosa's avatar
Arturo Espinosa committed
338 339 340
	newv = g_new (Value, 1);
	newv->type = VALUE_FLOAT;
	mpf_set_z (newv->v.v_float, v->v.v_int);
341
	value_release (v);
Arturo Espinosa's avatar
Arturo Espinosa committed
342 343 344 345
	
	return newv;
}

Arturo Espinosa's avatar
Arturo Espinosa committed
346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372
int
value_get_bool (Value *v, int *err)
{
	*err = 0;

	if (v->type == VALUE_STRING)
		return atoi (v->v.str->str);

	if (v->type == VALUE_CELLRANGE){
		*err = 1;
		return 0;
	}

	if (v->type == VALUE_INTEGER)
		return v->v.v_int != 0;

	if (v->type == VALUE_FLOAT)
		return v->v.v_float != 0.0;

	if (v->type == VALUE_ARRAY)
		return 0;
	
	g_warning ("Unhandled value in value_get_boolean");

	return 0;
}

Arturo Espinosa's avatar
Arturo Espinosa committed
373 374 375 376 377 378 379 380 381 382 383 384 385 386 387
float_t
value_get_as_double (Value *v)
{
	if (v->type == VALUE_STRING){
		return atof (v->v.str->str);
	}

	if (v->type == VALUE_CELLRANGE){
		g_warning ("Getting range as a double: what to do?");
		return 0.0;
	}

	if (v->type == VALUE_INTEGER)
		return (float_t) v->v.v_int;

Arturo Espinosa's avatar
Arturo Espinosa committed
388 389 390
	if (v->type == VALUE_ARRAY)
		return 0.0;
	
Arturo Espinosa's avatar
Arturo Espinosa committed
391
	return (float_t) v->v.v_float;
Arturo Espinosa's avatar
Arturo Espinosa committed
392 393
}

394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414
int
value_get_as_int (Value *v)
{
	if (v->type == VALUE_STRING){
		return atoi (v->v.str->str);
	}

	if (v->type == VALUE_CELLRANGE){
		g_warning ("Getting range as a double: what to do?");
		return 0.0;
	}

	if (v->type == VALUE_INTEGER)
		return v->v.v_int;

	if (v->type == VALUE_ARRAY)
		return 0.0;
	
	return (int) v->v.v_float;
}

415 416 417 418 419 420 421 422 423 424
static void
cell_ref_make_absolute (CellRef *cell_ref, int eval_col, int eval_row)
{
	g_return_if_fail (cell_ref != NULL);

	if (cell_ref->col_relative)
		cell_ref-> col = eval_col + cell_ref->col;

	if (cell_ref->row_relative)
		cell_ref->row = eval_row + cell_ref->row;
Arturo Espinosa's avatar
Arturo Espinosa committed
425 426
	cell_ref->row_relative = 0;
	cell_ref->col_relative = 0;
427 428
}

Arturo Espinosa's avatar
Arturo Espinosa committed
429 430
static Value *
eval_cell_value (Sheet *sheet, Value *value)
431
{
Arturo Espinosa's avatar
Arturo Espinosa committed
432
	Value *res;
433

Arturo Espinosa's avatar
Arturo Espinosa committed
434 435 436 437 438 439
	res = g_new (Value, 1);
	res->type = value->type;
	
	switch (res->type){
	case VALUE_STRING:
		res->v.str = value->v.str;
440
		string_ref (res->v.str);
Arturo Espinosa's avatar
Arturo Espinosa committed
441 442 443
		break;
		
	case VALUE_INTEGER:
444
		res->v.v_int = value->v.v_int;
Arturo Espinosa's avatar
Arturo Espinosa committed
445 446 447
		break;
		
	case VALUE_FLOAT:
448
		res->v.v_float = value->v.v_float;
Arturo Espinosa's avatar
Arturo Espinosa committed
449
		break;
Arturo Espinosa's avatar
Arturo Espinosa committed
450 451 452 453 454 455 456

	case VALUE_ARRAY:
		g_warning ("VALUE_ARRAY not handled in eval_cell_value\n");
		res->type = VALUE_INTEGER;
		res->v.v_int = 0;
		break;
			
Arturo Espinosa's avatar
Arturo Espinosa committed
457 458 459 460 461 462 463
	case VALUE_CELLRANGE:
		res->v.cell_range = value->v.cell_range;
		break;
	}
	return res;
}

464 465 466 467 468 469 470 471 472 473
static void
free_values (Value **values, int top)
{
	int i;
	
	for (i = 0; i < top; i++)
		value_release (values [i]);
	g_free (values);
}

Arturo Espinosa's avatar
Arturo Espinosa committed
474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495
static Value *
eval_funcall (Sheet *sheet, ExprTree *tree, int eval_col, int eval_row, char **error_string)
{
	FunctionDefinition *fd;
	GList *l;
	int argc, arg, i;
	Value *v;
	
	fd = (FunctionDefinition *) tree->u.function.symbol->data;
	
	l = tree->u.function.arg_list;
	argc = g_list_length (l);

	if (fd->expr_fn)
	{
		/* Functions that deal with ExprNodes */
		v = fd->expr_fn (sheet, l, eval_col, eval_row, error_string);
	}
	else
	{
		/* Functions that take pre-computed Values */
		Value **values;
Arturo Espinosa's avatar
Arturo Espinosa committed
496 497 498
		int fn_argc_min = 0, fn_argc_max = 0, var_len = 0;
		char *arg_type = fd->args;
		char *argptr = fd->args;
499 500
	       
		/* Get variable limits */
Arturo Espinosa's avatar
Arturo Espinosa committed
501 502 503 504
		while (*argptr){
			if (*argptr++ == '|'){
				var_len = 1;
				continue;
505 506
			}
			if (!var_len)
Arturo Espinosa's avatar
Arturo Espinosa committed
507 508
				fn_argc_min++;
			fn_argc_max++;
509
		}
510

Arturo Espinosa's avatar
Arturo Espinosa committed
511
		if (argc > fn_argc_max || argc < fn_argc_min){
Arturo Espinosa's avatar
Arturo Espinosa committed
512 513 514 515
			*error_string = _("Invalid number of arguments");
			return NULL;
		}

516
		values = g_new (Value *, fn_argc_max);
Arturo Espinosa's avatar
Arturo Espinosa committed
517
		
518
		for (arg = 0; l; l = l->next, arg++, arg_type++) {
Arturo Espinosa's avatar
Arturo Espinosa committed
519 520 521 522 523
			ExprTree *t = (ExprTree *) l->data;
			
			v = eval_expr (sheet, t, eval_col, eval_row, error_string);
			if (v == NULL)
				goto free_list;
Arturo Espinosa's avatar
Arturo Espinosa committed
524 525 526 527 528
			
			if (*arg_type=='|')
				arg_type++;
			
			switch (*arg_type){
529 530 531 532 533 534 535 536
			case 'f':
				if (v->type == VALUE_INTEGER ||
				    v->type == VALUE_FLOAT)
					break;
				
				free_values (values, arg);
				*error_string = _("Type mismatch");
				return NULL;
Arturo Espinosa's avatar
Arturo Espinosa committed
537

538 539 540 541 542 543
			case 's':
				if (v->type != VALUE_STRING){
					free_values (values, arg);
					*error_string = _("Type mismatch");
					return NULL;
				}
Arturo Espinosa's avatar
Arturo Espinosa committed
544 545
				break;
				
546 547 548 549 550 551
			case 'r':
				if (v->type != VALUE_CELLRANGE) {
					free_values (values, arg);
					*error_string = _("Type mismatch");
					return NULL;
				}
Arturo Espinosa's avatar
Arturo Espinosa committed
552 553 554
				cell_ref_make_absolute (&v->v.cell_range.cell_a, eval_col, eval_row);
				cell_ref_make_absolute (&v->v.cell_range.cell_b, eval_col, eval_row);
				break;
555
			}
Arturo Espinosa's avatar
Arturo Espinosa committed
556 557
			values [arg] = v;
		}
Arturo Espinosa's avatar
Arturo Espinosa committed
558 559
		while (arg < fn_argc_max)
			values [arg++] = NULL;
560
		v = fd->fn (fd, values, error_string);
Arturo Espinosa's avatar
Arturo Espinosa committed
561 562

	free_list:
563
		for (i = 0; i < arg; i++) {
Arturo Espinosa's avatar
Arturo Espinosa committed
564 565
			if (values [i] != NULL)
				value_release (values [i]);
566
		}
Arturo Espinosa's avatar
Arturo Espinosa committed
567 568 569 570 571 572
		g_free (values);
		return v;
	}
	return v;
}

573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591
Value *
function_def_call_with_values (Sheet *sheet, FunctionDefinition *fd, int argc,
			       Value *values [], char **error_string)
{
	Value *retval;
	
	if (fd->expr_fn){
		/*
		 * If function deals with ExprNodes, create some
		 * temporary ExprNodes with constants.
		 */
		ExprTree *tree = NULL;
		GList *l = NULL;
		int i;

		if (argc){
			tree = g_new (ExprTree, argc);
		
			for (i = 0; i < argc; i++){
592
				tree [i].oper = OPER_CONSTANT;
593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627
				tree [i].ref_count = 1;
				tree [i].u.constant = values [i];
				
				l = g_list_append (l, &(tree[i]));
			}
		}
		
		retval = fd->expr_fn (sheet, l, 0, 0, error_string);

		if (tree){
			g_free (tree);
			g_list_free (l);
		}

	} else 
		retval = fd->fn (fd, values, error_string);

	return retval;
}

/*
 * Use this to invoke a register function: the only drawback is that
 * you have to compute/expand all of the values to use this
 */
Value *
function_call_with_values (Sheet *sheet, char *name, int argc, Value *values[], char **error_string)
{
	FunctionDefinition *fd;
	Value *retval;
	Symbol *sym;

	g_return_val_if_fail (sheet != NULL, NULL);
	g_return_val_if_fail (IS_SHEET (sheet), NULL);
	g_return_val_if_fail (name != NULL, NULL);

Miguel de Icaza's avatar
Miguel de Icaza committed
628
	sym = symbol_lookup (global_symbol_table, name);
629 630 631 632
	if (sym == NULL){
		*error_string = "Function does not exist";
		return NULL;
	}
633 634 635 636 637 638 639 640 641 642 643 644 645 646 647
	if (sym->type != SYMBOL_FUNCTION){
		*error_string = "Calling non-function";
		return NULL;
	}
	
	fd = sym->data;

	symbol_ref (sym);
	retval = function_def_call_with_values (sheet, fd, argc, values, error_string);

	symbol_unref (sym);

	return retval;
}

648
typedef enum {
Arturo Espinosa's avatar
Arturo Espinosa committed
649 650
	IS_EQUAL,
	IS_LESS,
651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675
	IS_GREATER,
	TYPE_ERROR
} compare_t;

static compare_t
compare_int_int (int a, int b)
{
	if (a == b)
		return IS_EQUAL;
	else if (a < b)
		return IS_LESS;
	else
		return IS_GREATER;
}

static compare_t
compare_float_float (float_t a, float_t b)
{
	if (a == b)
		return IS_EQUAL;
	else if (a < b)
		return IS_LESS;
	else
		return IS_GREATER;
}
Arturo Espinosa's avatar
Arturo Espinosa committed
676

677 678 679 680
/*
 * Compares two (Value *) and returns one of compare_t
 */
static compare_t
Arturo Espinosa's avatar
Arturo Espinosa committed
681 682
compare (Value *a, Value *b)
{
683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733
	if (a->type == VALUE_INTEGER){
		int f;
		
		switch (b->type){
		case VALUE_INTEGER:
			return compare_int_int (a->v.v_int, b->v.v_int);

		case VALUE_FLOAT:
			return compare_float_float (a->v.v_int, b->v.v_float);

		case VALUE_STRING:
			f = value_get_as_double (b);
			return compare_float_float (a->v.v_int, f);

		default:
			return TYPE_ERROR;
		}
	}
	
	if (a->type == VALUE_FLOAT){
		float_t f;

		switch (b->type){
		case VALUE_INTEGER:
			return compare_float_float (a->v.v_float, b->v.v_int);

		case VALUE_FLOAT:
			return compare_float_float (a->v.v_float, b->v.v_float);

		case VALUE_STRING:
			f = value_get_as_double (b);
			return compare_float_float (a->v.v_float, f);

		default:
			return TYPE_ERROR;
		}
	}

	if (a->type == VALUE_STRING && b->type == VALUE_STRING){
		int t;

		t = strcasecmp (a->v.str->str, b->v.str->str);
		if (t == 0)
			return IS_EQUAL;
		else if (t > 0)
			return IS_GREATER;
		else
			return IS_LESS;
	}

	return TYPE_ERROR;
Arturo Espinosa's avatar
Arturo Espinosa committed
734 735
}

Arturo Espinosa's avatar
Arturo Espinosa committed
736
Value *
737
eval_expr (void *asheet, ExprTree *tree, int eval_col, int eval_row, char **error_string)
Arturo Espinosa's avatar
Arturo Espinosa committed
738 739 740
{
	Value *a, *b, *res;
	Sheet *sheet = asheet;
Arturo Espinosa's avatar
Arturo Espinosa committed
741 742 743 744 745

	g_return_val_if_fail (tree != NULL, NULL);
	g_return_val_if_fail (asheet != NULL, NULL);
	g_return_val_if_fail (error_string != NULL, NULL);
	g_return_val_if_fail (IS_SHEET (asheet), NULL);
Arturo Espinosa's avatar
Arturo Espinosa committed
746
	
747
	switch (tree->oper){
748 749 750 751 752 753
	case OPER_EQUAL:
	case OPER_NOT_EQUAL:
	case OPER_GT:
	case OPER_GTE:
	case OPER_LT:
	case OPER_LTE: {
Arturo Espinosa's avatar
Arturo Espinosa committed
754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771
		int comp;
		
		a = eval_expr (sheet, tree->u.binary.value_a,
			       eval_col, eval_row, error_string);
		b = eval_expr (sheet, tree->u.binary.value_b,
			       eval_col, eval_row, error_string);
		if (!(a && b)){
			if (a)
				value_release (a);
			if (b)
				value_release (b);
			return NULL;
		}
		res = g_new (Value, 1);
		res->type = VALUE_INTEGER;

		comp = compare (a, b);

772 773 774 775 776 777 778
		if (comp == TYPE_ERROR){
			value_release (a);
			value_release (b);
			*error_string = _("Type error");
			return NULL;
		}
		
Arturo Espinosa's avatar
Arturo Espinosa committed
779
		switch (tree->oper){
780
		case OPER_EQUAL:
Arturo Espinosa's avatar
Arturo Espinosa committed
781 782 783
			res->v.v_int = comp == IS_EQUAL;
			break;

784
		case OPER_GT:
785
			res->v.v_int = comp == IS_GREATER;
Arturo Espinosa's avatar
Arturo Espinosa committed
786 787
			break;

788
		case OPER_LT:
Arturo Espinosa's avatar
Arturo Espinosa committed
789 790 791
			res->v.v_int = comp == IS_LESS;
			break;

792
		case OPER_LTE:
Arturo Espinosa's avatar
Arturo Espinosa committed
793 794 795
			res->v.v_int = (comp == IS_EQUAL || comp == IS_LESS);
			break;

796
		case OPER_GTE:
797
			res->v.v_int = (comp == IS_EQUAL || comp == IS_GREATER);
Arturo Espinosa's avatar
Arturo Espinosa committed
798 799
			break;

800
		case OPER_NOT_EQUAL:
Arturo Espinosa's avatar
Arturo Espinosa committed
801 802 803 804 805 806 807 808 809 810 811
			res->v.v_int = comp != IS_EQUAL;
			break;
			
		default:
			g_warning ("This should never be reached: comparission ops\n");
		}
		value_release (a);
		value_release (b);
		return res;
	}
	
812 813 814 815 816
	case OPER_ADD:
	case OPER_SUB:
	case OPER_MULT:
	case OPER_DIV:
	case OPER_EXP:
817 818
		a = eval_expr (sheet, tree->u.binary.value_a,
			       eval_col, eval_row, error_string);
819 820 821 822

		if (!a)
			return NULL;
		
823 824
		b = eval_expr (sheet, tree->u.binary.value_b,
			       eval_col, eval_row, error_string);
Arturo Espinosa's avatar
Arturo Espinosa committed
825

826 827
		if (!b){
			value_release (a);
Arturo Espinosa's avatar
Arturo Espinosa committed
828 829
			return NULL;
		}
830

Arturo Espinosa's avatar
Arturo Espinosa committed
831
		if (!VALUE_IS_NUMBER (a) || !VALUE_IS_NUMBER (b)){
832 833
			value_release (a);
			value_release (b);
Arturo Espinosa's avatar
Arturo Espinosa committed
834 835 836 837 838 839
			*error_string = _("Type mismatch");
			return NULL;
		}
		
		res = g_new (Value, 1);
		if (a->type == VALUE_INTEGER && b->type == VALUE_INTEGER){
840 841 842
			int ia = a->v.v_int;
			int ib = b->v.v_int;
			
Arturo Espinosa's avatar
Arturo Espinosa committed
843 844
			res->type = VALUE_INTEGER;
			
845
			switch (tree->oper){
846
			case OPER_SUB:
847 848 849 850
			case OPER_ADD: {
				int sum;

				if (tree->oper == OPER_SUB){
Arturo Espinosa's avatar
0.20  
Arturo Espinosa committed
851
					ib = -ib;
852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871
				}

				sum = ia + ib;
				
				if ((ia > 0) && (ib > 0)){
					
					if (sum < ia){
						res->type = VALUE_FLOAT;
						res->v.v_float = ((double)ia) + ib;
					} else
						res->v.v_int = sum;
				} else if ((ia < 0) && (ib < 0)){
					if (sum > ia){
						res->type = VALUE_FLOAT;
						res->v.v_float = ((double)ia) + ib;
					} else
						res->v.v_int = sum;
				} else
					res->v.v_int = sum;
				
Arturo Espinosa's avatar
Arturo Espinosa committed
872
				break;
873
			}
Arturo Espinosa's avatar
Arturo Espinosa committed
874
				
875
			case OPER_MULT:
Arturo Espinosa's avatar
Arturo Espinosa committed
876
				res->v.v_int = a->v.v_int * b->v.v_int;
Arturo Espinosa's avatar
Arturo Espinosa committed
877
				break;
Arturo Espinosa's avatar
Arturo Espinosa committed
878

879
			case OPER_DIV:
Arturo Espinosa's avatar
Arturo Espinosa committed
880
				if (b->v.v_int == 0){
881 882 883
					value_release (a);
					value_release (b);
					value_release (res);
Arturo Espinosa's avatar
Arturo Espinosa committed
884 885 886
					*error_string = _("Division by zero");
					return NULL;
				}
887 888
				res->type = VALUE_FLOAT;
				res->v.v_float =  a->v.v_int / (float_t)b->v.v_int;
Arturo Espinosa's avatar
Arturo Espinosa committed
889 890
				break;
				
891
			case OPER_EXP: 
Arturo Espinosa's avatar
Arturo Espinosa committed
892
				res->v.v_int = pow (a->v.v_int, b->v.v_int);
Arturo Espinosa's avatar
Arturo Espinosa committed
893 894
				break;
			default:
895
				break;
Arturo Espinosa's avatar
Arturo Espinosa committed
896 897 898
			}
		} else {
			res->type = VALUE_FLOAT;
Arturo Espinosa's avatar
Arturo Espinosa committed
899
			res->v.v_float = 0.0;
900 901
			a = value_cast_to_float (a);
			b = value_cast_to_float (b);
Arturo Espinosa's avatar
Arturo Espinosa committed
902
			
903
			switch (tree->oper){
904
			case OPER_ADD:
Arturo Espinosa's avatar
Arturo Espinosa committed
905
				res->v.v_float = a->v.v_float + b->v.v_float;
Arturo Espinosa's avatar
Arturo Espinosa committed
906 907
				break;
				
908
			case OPER_SUB:
Arturo Espinosa's avatar
Arturo Espinosa committed
909
				res->v.v_float = a->v.v_float - b->v.v_float;
Arturo Espinosa's avatar
Arturo Espinosa committed
910 911
				break;
				
912
			case OPER_MULT:
Arturo Espinosa's avatar
Arturo Espinosa committed
913
				res->v.v_float = a->v.v_float * b->v.v_float;
Arturo Espinosa's avatar
Arturo Espinosa committed
914 915
				break;
				
916
			case OPER_DIV:
Arturo Espinosa's avatar
Arturo Espinosa committed
917
				if (b->v.v_float == 0.0){
918 919 920
					value_release (a);
					value_release (b);
					value_release (res);
Arturo Espinosa's avatar
Arturo Espinosa committed
921 922 923
					*error_string = _("Division by zero");
					return NULL;
				}
Arturo Espinosa's avatar
Arturo Espinosa committed
924 925

				res->v.v_float = a->v.v_float / b->v.v_float;
Arturo Espinosa's avatar
Arturo Espinosa committed
926 927
				break;
				
928
			case OPER_EXP:
Arturo Espinosa's avatar
Arturo Espinosa committed
929
				res->v.v_float = pow (a->v.v_float, b->v.v_float);
Arturo Espinosa's avatar
Arturo Espinosa committed
930 931
				break;
			default:
932
				break;
Arturo Espinosa's avatar
Arturo Espinosa committed
933 934
			}
		}
935 936
		value_release (a);
		value_release (b);
Arturo Espinosa's avatar
Arturo Espinosa committed
937 938
		return res;
		
939
	case OPER_CONCAT: {
940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957
		char *sa, *sb, *tmp;

		a = eval_expr (sheet, tree->u.binary.value_a,
			       eval_col, eval_row, error_string);
		if (!a)
			return NULL;
		b = eval_expr (sheet, tree->u.binary.value_b,
			       eval_col, eval_row, error_string);
		if (!b){
			value_release (a);
			return NULL;
		}

		res = g_new (Value, 1);
		res->type = VALUE_STRING;
		sa = value_string (a);
		sb = value_string (b);
		
Jeff Garzik's avatar
Jeff Garzik committed
958
		tmp = g_strconcat (sa, sb, NULL);
959 960 961 962 963 964 965 966 967
		res->v.str = string_get (tmp);
		g_free (sa);
		g_free (sb);
		g_free (tmp);

		value_release (a);
		value_release (b);
		return res;
	}
Arturo Espinosa's avatar
Arturo Espinosa committed
968

969
	case OPER_FUNCALL:
Arturo Espinosa's avatar
Arturo Espinosa committed
970
		return eval_funcall (sheet, tree, eval_col, eval_row, error_string);
Arturo Espinosa's avatar
Arturo Espinosa committed
971

972
	case OPER_VAR: {
973
		Sheet *cell_sheet;
974
		CellRef *ref;
Arturo Espinosa's avatar
Arturo Espinosa committed
975 976 977 978 979 980 981 982 983 984 985 986 987
		Cell *cell;
		int col, row;
		
		if (sheet == NULL){
			/* Only the test program requests this */
			res = g_new (Value, 1);

			res->type = VALUE_FLOAT;
			res->v.v_float = 3.14;
			
			return res;
		}

988
		ref = &tree->u.ref;
989
		cell_get_abs_col_row (ref, eval_col, eval_row, &col, &row);
Arturo Espinosa's avatar
Today:  
Arturo Espinosa committed
990

991 992 993
		cell_sheet = ref->sheet ? ref->sheet : sheet;
		
		cell = sheet_cell_get (cell_sheet, col, row);
994

Arturo Espinosa's avatar
Arturo Espinosa committed
995
		if (cell){
996
			if (cell->generation != sheet->workbook->generation){
997
				cell->generation = sheet->workbook->generation;
998 999 1000 1001 1002

				if (cell->parsed_node)
					cell_eval (cell);
			}

1003 1004
			if (cell->value)
				return eval_cell_value (sheet, cell->value);
1005
			else {
1006 1007 1008 1009
				if (cell->text)
					*error_string = cell->text->str;
				else
					*error_string = _("Reference to newborn cell");
1010 1011
				return NULL;
			}
Arturo Espinosa's avatar
Arturo Espinosa committed
1012
		}
1013 1014 1015 1016
		res = g_new (Value, 1);
			
		res->type = VALUE_INTEGER;
		res->v.v_int = 0;
Arturo Espinosa's avatar
Arturo Espinosa committed
1017 1018
		return res;
	}
1019 1020 1021 1022
	
	case OPER_CONSTANT:
		return eval_cell_value (sheet, tree->u.constant);

1023
	case OPER_NEG:
1024 1025
		a = eval_expr (sheet, tree->u.value,
			       eval_col, eval_row, error_string);
Arturo Espinosa's avatar
Arturo Espinosa committed
1026 1027 1028 1029
		if (!a)
			return NULL;
		if (!VALUE_IS_NUMBER (a)){
			*error_string = _("Type mismatch");
1030
			value_release (a);
Arturo Espinosa's avatar
Arturo Espinosa committed
1031 1032 1033
			return NULL;
		}
		res = g_new (Value, 1);
1034
		res->type = a->type;
Arturo Espinosa's avatar
Arturo Espinosa committed
1035
		if (a->type == VALUE_INTEGER){
Arturo Espinosa's avatar
Arturo Espinosa committed
1036
			res->v.v_int = -a->v.v_int;
Arturo Espinosa's avatar
Arturo Espinosa committed
1037
		} else {
Arturo Espinosa's avatar
Arturo Espinosa committed
1038
			res->v.v_float = -a->v.v_float;
Arturo Espinosa's avatar
Arturo Espinosa committed
1039
		}
1040
		value_release (a);
Arturo Espinosa's avatar
Arturo Espinosa committed
1041
		return res;
1042
	}
Arturo Espinosa's avatar
Arturo Espinosa committed
1043 1044 1045
	
	*error_string = _("Unknown evaluation error");
	return NULL;
1046
}
Arturo Espinosa's avatar
Arturo Espinosa committed
1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063

void
cell_get_abs_col_row (CellRef *cell_ref, int eval_col, int eval_row, int *col, int *row)
{
	g_return_if_fail (cell_ref != NULL);

	if (cell_ref->col_relative)
		*col = eval_col + cell_ref->col;
	else
		*col = cell_ref->col;

	if (cell_ref->row_relative)
		*row = eval_row + cell_ref->row;
	else
		*row = cell_ref->row;
}

1064 1065 1066
static int
evaluate_level (Operation x)
{
1067
	if (x == OPER_EXP)
1068
		return 3;
1069
	if ((x==OPER_MULT) || (x==OPER_DIV))
1070
		return 2;
1071
	if ((x==OPER_ADD)  || (x==OPER_SUB)   || (x==OPER_CONCAT))
1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083
		return 1;
	return 0;
}

static int
bigger_prec (Operation parent, Operation this)
{
	int parent_level, this_level;

	parent_level = evaluate_level (parent);
	this_level   = evaluate_level (this);

1084
	return parent_level >= this_level;
1085 1086
}

1087 1088 1089 1090 1091 1092 1093 1094 1095
/*
 * Converts a parsed tree into its string representation
 * assuming that we are evaluating at col, row (This is
 * only used during copying to "render" a new text
 * representation for a copied cell.
 *
 * This routine is pretty simple: it walks the ExprTree and
 * create a string representation.
 */
1096
static char *
1097
do_expr_decode_tree (ExprTree *tree, void *sheet, int col, int row, Operation parent_op)
1098 1099 1100 1101 1102 1103 1104 1105 1106
{
	static const char *binary_operation_names [] = {
		"=", ">", "<", ">=", "<=", "<>",
		"+", "-", "*", "/",  "^",  "&"
	};

	switch (tree->oper){

		/* The binary operations */
1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118
	case OPER_EQUAL:
	case OPER_NOT_EQUAL:
	case OPER_GT:
	case OPER_GTE:
	case OPER_LT:
	case OPER_LTE:
	case OPER_ADD:
	case OPER_SUB:
	case OPER_MULT:
	case OPER_DIV:
	case OPER_EXP:
	case OPER_CONCAT: {	
1119 1120 1121
		char *a, *b, *res;
		char const *op;
		
1122 1123
		a = do_expr_decode_tree (tree->u.binary.value_a, sheet, col, row, tree->oper);
		b = do_expr_decode_tree (tree->u.binary.value_b, sheet, col, row, tree->oper);
1124
		op = binary_operation_names [tree->oper];
1125 1126

		if (bigger_prec (parent_op, tree->oper))
Jeff Garzik's avatar
Jeff Garzik committed
1127
			res = g_strconcat ("(", a, op, b, ")", NULL);
1128
		else
Jeff Garzik's avatar
Jeff Garzik committed
1129
			res = g_strconcat (a, op, b, NULL);
1130
		
1131 1132 1133 1134 1135
		g_free (a);
		g_free (b);
		return res;
	}
	
1136
	case OPER_NEG: {
1137 1138
		char *res, *a;

1139
		a = do_expr_decode_tree (tree->u.value, sheet, col, row, tree->oper);
1140
		res = g_strconcat ("-", a, NULL);
1141 1142 1143 1144
		g_free (a);
		return res;
	}
	
1145
	case OPER_FUNCALL: {
1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160
		FunctionDefinition *fd;
		GList *arg_list, *l;
		char *res, *sum;
		char **args;
		int  argc;

		fd = tree->u.function.symbol->data;
		arg_list = tree->u.function.arg_list;
		argc = g_list_length (arg_list);

		if (argc){
			int i, len = 0;
			args = g_malloc (sizeof (char *) * argc);

			i = 0;
1161
			for (l = arg_list; l; l = l->next, i++){
1162 1163
				ExprTree *t = l->data;
				
1164
				args [i] = do_expr_decode_tree (t, sheet, col, row, OPER_CONSTANT);
1165 1166 1167
				len += strlen (args [i]) + 1;
			}
			len++;
1168
			sum = g_malloc (len + 2);
1169 1170 1171
			
			i = 0;
			sum [0] = 0;
1172
			for (l = arg_list; l; l = l->next, i++){
1173
				strcat (sum, args [i]);
1174 1175 1176 1177
				if (l->next)
					strcat (sum, ",");
			}
			
Jeff Garzik's avatar
Jeff Garzik committed
1178
			res = g_strconcat (
1179 1180 1181 1182 1183 1184 1185 1186
				fd->name, "(", sum, ")", NULL);

			for (i = 0; i < argc; i++)
				g_free (args [i]);
			g_free (args);

			return res;
		} else
Jeff Garzik's avatar
Jeff Garzik committed
1187
			return g_strconcat (fd->name, "()", NULL);
1188 1189
	}
	
1190 1191 1192
	case OPER_VAR: {
		CellRef *cell_ref;
		
1193
		cell_ref = &tree->u.ref;
1194 1195 1196
		return cellref_name (cell_ref, sheet, col, row);
	}

1197
	case OPER_CONSTANT: {
1198 1199 1200
		Value *v = tree->u.constant;

		if (v->type == VALUE_CELLRANGE){
1201 1202 1203 1204
			char *a, *b, *res;

			a = cellref_name (&v->v.cell_range.cell_a, sheet, col, row);
			b = cellref_name (&v->v.cell_range.cell_b, sheet, col, row);
1205

Jeff Garzik's avatar
Jeff Garzik committed
1206
			res = g_strconcat (a, ":", b, NULL);
1207

1208 1209 1210