expr.c 8.23 KB
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#include <config.h>
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#include <gnome.h>
#include "gnumeric.h"
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char *parser_expr;
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ParseErr parser_error;
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ExprTree *parser_result;
int parser_col, parser_row;
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ExprTree *
expr_parse_string (char *expr, int col, int row, char **error_msg)
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{
	parser_expr = expr;
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	parser_error = PARSE_OK;
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	parser_col = col;
	parser_row = row;
		
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	yyparse ();
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	switch (parser_error){
	case PARSE_OK:
		*error_msg = NULL;
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		parser_result->ref_count = 1;
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		return parser_result;
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	case PARSE_ERR_SYNTAX:
		*error_msg = _("Syntax error");
		break;
			
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	case PARSE_ERR_NO_QUOTE:
		*error_msg = _("Missing quote");
		break;
	}
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	return NULL;
}

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/*
 * eval_expr_release:
 * @ExprTree:  The tree to be released
 *
 * This releases all of the resources used by a tree.  
 * It is only used internally by eval_expr_unref
 */
static void
eval_expr_release (ExprTree *tree)
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{
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	g_return_if_fail (tree != NULL);
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	switch (tree->oper){
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	case OP_VAR:
		break;
		
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	case OP_CONSTANT:
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		value_release (tree->u.constant);
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		break;
		
	case OP_FUNCALL:
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		symbol_unref (tree->u.function.symbol);
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		break;

	case OP_ADD:
	case OP_SUB:
	case OP_MULT:
	case OP_DIV:
	case OP_EXP:
	case OP_CONCAT:
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		eval_expr_release (tree->u.binary.value_a);
		eval_expr_release (tree->u.binary.value_b);
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		break;

	case OP_NEG:
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		eval_expr_release (tree->u.value);
		break;
		
	default:
		g_warning ("Unknown ExprTree type passed to eval_expr_release\n");
	}
	g_free (tree);
}

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

	tree->ref_count++;
}

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

	tree->ref_count--;
	if (tree->ref_count == 0)
		eval_expr_release (tree);
}

void
value_release (Value *value)
{
	switch (value->type){
	case VALUE_STRING:
		string_unref (value->v.str);
		break;

	case VALUE_INTEGER:
		mpz_clear (value->v.v_int);
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		break;
		
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	case VALUE_FLOAT:
		mpf_clear (value->v.v_float);
		break;

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	default:
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		g_warning ("Unknown value type passed to value_release\n");
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	}
}
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/*
 * Casts a value to float if it is integer, and returns
 * a new Value * if required
 */
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Value *
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value_cast_to_float (Value *v)
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{
	Value *newv;
	
	g_return_val_if_fail (VALUE_IS_NUMBER (v), NULL);

	if (v->type == VALUE_FLOAT)
		return v;
	
	newv = g_new (Value, 1);
	newv->type = VALUE_FLOAT;
	mpf_set_z (newv->v.v_float, v->v.v_int);
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	value_release (v);
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	return newv;
}

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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;

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	return (float_t) v->v.v_float;
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}

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static Value *
eval_cell_value (Sheet *sheet, Value *value)
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{
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	Value *res;
	
	res = g_new (Value, 1);
	res->type = value->type;
	
	switch (res->type){
	case VALUE_STRING:
		res->v.str = value->v.str;
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		string_ref (res->v.str);
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		break;
		
	case VALUE_INTEGER:
		mpz_init (res->v.v_int);
		mpz_set  (res->v.v_int, value->v.v_int);
		break;
		
	case VALUE_FLOAT:
		mpf_init (res->v.v_float);
		mpf_set (res->v.v_float, value->v.v_float);
		break;
		
	case VALUE_CELLRANGE:
		res->v.cell_range = value->v.cell_range;
		break;
	}
	return res;
}

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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;
		int fn_argc;
		char *arg_type = fd->args;
		
		fn_argc = strlen (fd->args);
		
		if (fn_argc != argc){
			*error_string = _("Invalid number of arguments");
			return NULL;
		}

		values = g_new (Value *, argc);
		
		for (arg = 0; l; l = l->next, arg++, arg_type++){
			ExprTree *t = (ExprTree *) l->data;
			
			v = eval_expr (sheet, t, eval_col, eval_row, error_string);
			if (v == NULL)
				goto free_list;
			
			values [arg] = v;
		}
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		v = fd->fn (values, error_string);
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	free_list:
		for (i = 0; i < arg; i++)
			value_release (values [i]);
		g_free (values);
		return v;
	}
	return v;
}

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Value *
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eval_expr (void *asheet, ExprTree *tree, int eval_col, int eval_row, char **error_string)
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{
	Value *a, *b, *res;
	Sheet *sheet = asheet;
	
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	switch (tree->oper){
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	case OP_ADD:
	case OP_SUB:
	case OP_MULT:
	case OP_DIV:
	case OP_EXP:
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		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);
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		if (!(a && b)){
			if (a)
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				value_release (a);
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			if (b)
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				value_release (b);
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			return NULL;
		}
		
		if (!VALUE_IS_NUMBER (a) || !VALUE_IS_NUMBER (b)){
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			value_release (a);
			value_release (b);
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			*error_string = _("Type mismatch");
			return NULL;
		}
		
		res = g_new (Value, 1);
		if (a->type == VALUE_INTEGER && b->type == VALUE_INTEGER){
			res->type = VALUE_INTEGER;
			mpz_init (res->v.v_int);
			
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			switch (tree->oper){
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			case OP_ADD:
				mpz_add (res->v.v_int, a->v.v_int, b->v.v_int);
				break;
				
			case OP_SUB:
				mpz_sub (res->v.v_int, a->v.v_int, b->v.v_int);
				break;
				
			case OP_MULT:
				mpz_mul (res->v.v_int, a->v.v_int, b->v.v_int);
				break;
				
			case OP_DIV:
				if (mpz_cmp_si (b->v.v_int, 0)){
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					value_release (a);
					value_release (b);
					value_release (res);
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					*error_string = _("Division by zero");
					return NULL;
				}
					
				mpz_tdivq(res->v.v_int, a->v.v_int,b->v.v_int);
				break;
				
			case OP_EXP:
				mpz_set_si (res->v.v_int, 0);
				g_warning ("INT EXP not implemented yet\n");
				break;
			default:
			}
		} else {
			res->type = VALUE_FLOAT;
			mpf_init (res->v.v_float);
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			a = value_cast_to_float (a);
			b = value_cast_to_float (b);
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			switch (tree->oper){
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			case OP_ADD:
				mpf_add (res->v.v_float,
					 a->v.v_float, b->v.v_float);
				break;
				
			case OP_SUB:
				mpf_sub (res->v.v_float,
					 a->v.v_float, b->v.v_float);
				break;
				
			case OP_MULT:
				mpf_mul (res->v.v_float,
					 a->v.v_float, b->v.v_float);
				break;
				
			case OP_DIV:
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				if (mpf_cmp_si (b->v.v_float, 0.0)){
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					value_release (a);
					value_release (b);
					value_release (res);
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					*error_string = _("Division by zero");
					return NULL;
				}
					
				mpf_div (res->v.v_float,
					 a->v.v_float, b->v.v_float);
				break;
				
			case OP_EXP:
				mpz_set_si (res->v.v_int, 0);
				g_warning ("FLOAT EXP not implemented yet\n");
				break;
			default:
			}
		}
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		value_release (a);
		value_release (b);
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		return res;
		
	case OP_CONCAT:
		g_warning ("Concat not implemented yet\n");
		*error_string = _("OOPS");
		return NULL;

	case OP_FUNCALL:
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		return eval_funcall (sheet, tree, eval_col, eval_row, error_string);
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	case OP_CONSTANT:
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		return eval_cell_value (sheet, tree->u.constant);
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	case OP_VAR:{
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		CellRef *ref;
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		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;
		}

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		ref = &tree->u.constant->v.cell;
		if (ref->col_relative)
			col = eval_col + ref->col;
		else
			col = ref->col;
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		if (ref->row_relative)
			row = eval_row + ref->row;
		else
			row = ref->row;
		
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		cell = sheet_cell_get (sheet, col, row);
		if (!cell)
			cell = sheet_cell_new (sheet, col, row);
		
		if (!cell->value){
			res = g_new (Value, 1);
			
			res->type = VALUE_INTEGER;
			res->v.v_int = 0;
		} else {
			return eval_cell_value (sheet, cell->value);
		}
		return res;
	}
	case OP_NEG:
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		a = eval_expr (sheet, tree->u.value,
			       eval_col, eval_row, error_string);
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		if (!a)
			return NULL;
		if (!VALUE_IS_NUMBER (a)){
			*error_string = _("Type mismatch");
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			value_release (a);
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			return NULL;
		}
		res = g_new (Value, 1);
		if (a->type == VALUE_INTEGER){
			mpz_init_set (res->v.v_int, a->v.v_int);
			mpz_neg (res->v.v_int, a->v.v_int);
		} else {
			mpf_init_set (res->v.v_int, a->v.v_int);
			mpf_neg (res->v.v_float, a->v.v_float);
		}
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		value_release (a);
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		return res;
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	}
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	*error_string = _("Unknown evaluation error");
	return NULL;
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}