expr.c 27.8 KB
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/*
 * expr.c: Expression evaluation in Gnumeriuc
 *
 * Author:
 *   Miguel de Icaza (miguel@gnu.org).
 */
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#include <config.h>
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#include <gnome.h>
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#include <math.h>
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#include <string.h>
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#include "gnumeric.h"
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#include "expr.h"
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#include "eval.h"
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#include "format.h"
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#include "func.h"
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ExprTree *
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expr_parse_string (const char *expr, Sheet *sheet, int col, int row,
		   const char **desired_format, char **error_msg)
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{
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	ExprTree *tree;
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	g_return_val_if_fail (expr != NULL, NULL);
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	switch (gnumeric_expr_parser (expr, sheet, col, row, desired_format, &tree)) {
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	case PARSE_OK:
		*error_msg = NULL;
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		tree->ref_count = 1;
		return tree;
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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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	default:
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		g_assert_not_reached ();
		*error_msg = _("Impossible!");
		break;
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	}
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	return NULL;
}

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

	tree->ref_count++;
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	switch (tree->oper){
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	case OPER_VAR:
	case OPER_CONSTANT:
	case OPER_FUNCALL:
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		break;

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	case OPER_ANY_BINARY:
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		do_expr_tree_ref (tree->u.binary.value_a);
		do_expr_tree_ref (tree->u.binary.value_b);
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		break;

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	case OPER_ANY_UNARY:
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		do_expr_tree_ref (tree->u.value);
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		break;
	}
}

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/*
 * expr_tree_ref:
 * Increments the ref_count for part of a tree
 */
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void
expr_tree_ref (ExprTree *tree)
{
	g_return_if_fail (tree != NULL);
	g_return_if_fail (tree->ref_count > 0);

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	do_expr_tree_ref (tree);
}

static void
do_expr_tree_unref (ExprTree *tree)
{
	tree->ref_count--;
	switch (tree->oper){
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	case OPER_VAR:
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		break;
		
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	case OPER_CONSTANT:
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		if (tree->ref_count == 0)
			value_release (tree->u.constant);
		break;
		
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	case OPER_FUNCALL:
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		if (tree->ref_count == 0)
			symbol_unref (tree->u.function.symbol);
		break;

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	case OPER_ANY_BINARY:
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		do_expr_tree_unref (tree->u.binary.value_a);
		do_expr_tree_unref (tree->u.binary.value_b);
		break;

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	case OPER_ANY_UNARY:
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		do_expr_tree_unref (tree->u.value);
		break;
	}
	
	if (tree->ref_count == 0)
		g_free (tree);
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}

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

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	do_expr_tree_unref (tree);
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}

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/*
 * simplistic value rendering
 */
char *
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value_string (const Value *value)
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{
	switch (value->type){
	case VALUE_STRING:
		return g_strdup (value->v.str->str);

	case VALUE_INTEGER:
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		return g_strdup_printf ("%d", value->v.v_int);
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	case VALUE_FLOAT:
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		return g_strdup_printf ("%g", value->v.v_float);
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	case VALUE_ARRAY:
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		return g_strdup ("ARRAY");
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	case VALUE_CELLRANGE:
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		break;
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	}
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	return g_strdup ("Internal problem");
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}

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void
value_release (Value *value)
{
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	g_return_if_fail (value != NULL);
	
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	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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	case VALUE_ARRAY:{
		guint i;
		
		for (i = 0; i < value->v.array.x; i++)
			g_free (value->v.array.vals [i]);
		
		g_free (value->v.array.vals);
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	}
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	case VALUE_CELLRANGE:
		break;
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	}
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	g_free (value);
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}
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/*
 * Copies a Value.
 */
void
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value_copy_to (Value *dest, const Value *source)
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{
	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;

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	case VALUE_ARRAY: {
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		value_array_copy_to (dest, source);
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		break;
	}
	case VALUE_CELLRANGE:
		dest->v.cell_range = source->v.cell_range;
		break;
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	}
}

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/*
 * Makes a copy of a Value
 */
Value *
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value_duplicate (const Value *value)
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{
	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;
}

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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;
}

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Value *
value_str (char *str)
{
	Value *v = g_new (Value, 1);

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

	return v;
}

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Value *
value_cellrange (CellRef *a, CellRef *b)
{
	Value *v = g_new (Value, 1);
	v->type = VALUE_CELLRANGE;
	memcpy (&v->v.cell_range.cell_a, a, sizeof(CellRef));
	memcpy (&v->v.cell_range.cell_b, b, sizeof(CellRef));
	return v;
}

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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;
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	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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int
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value_get_bool (const Value *v, int *err)
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{
	*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;
}

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float_t
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value_get_as_double (const Value *v)
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{
	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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	if (v->type == VALUE_ARRAY)
		return 0.0;
	
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	return (float_t) v->v.v_float;
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}

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int
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value_get_as_int (const Value *v)
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{
	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;
}

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Value *
value_array_new (guint width, guint height)
{
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	int x, y;
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	Value *v = g_new (Value, 1);
	v->type = VALUE_ARRAY;
	v->v.array.x = width;
	v->v.array.y = height;
	v->v.array.vals = g_new (Value *, width);
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	for (x = 0; x < width; x++){
		v->v.array.vals [x] = g_new (Value, height);

		for (y = 0; y < height; y++){
			v->v.array.vals[x][y].type = VALUE_INTEGER;
			v->v.array.vals[x][y].v.v_int = 0;
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		}
	}
	return v;
}

void
value_array_resize (Value *v, guint width, guint height)
{
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	int x, xcpy, ycpy;
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	Value *newval;

	g_return_if_fail (v);
	g_return_if_fail (v->type == VALUE_ARRAY);

	newval = value_array_new (width, height);

	if (width>v->v.array.x)
		xcpy = v->v.array.x;
	else
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		xcpy = width;
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	if (height>v->v.array.y)
		ycpy = v->v.array.y;
	else
		ycpy = height;

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	for (x = 0; x < xcpy; x++){
		memcpy (newval->v.array.vals [x],
			v->v.array.vals [x],
			sizeof (Value) * ycpy);
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	}
	v->v.array.vals = newval->v.array.vals;
	v->v.array.x = width;
	v->v.array.y = height;
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	value_release (newval);
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}

void
value_array_copy_to (Value *v, const Value *src)
{
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	int x;
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	g_return_if_fail (src->type == VALUE_ARRAY);
	v->type = VALUE_ARRAY;
	v->v.array.x = src->v.array.x;
	v->v.array.y = src->v.array.y;
	v->v.array.vals = g_new (Value *, v->v.array.x);
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	for (x = 0; x < v->v.array.x; x++){
		v->v.array.vals [x] = g_new (Value,v->v.array.y);
		
		memcpy (v->v.array.vals   [x],
			src->v.array.vals [x],
			sizeof(Value)*v->v.array.y);
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	}
}

guint
value_area_get_width (Value *v)
{
	g_return_val_if_fail (v, 0);
	g_return_val_if_fail (v->type == VALUE_ARRAY ||
			      v->type == VALUE_CELLRANGE, 1);
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	if (v->type == VALUE_ARRAY)
		return v->v.array.x;
	else
		return v->v.cell_range.cell_b.col -
		       v->v.cell_range.cell_a.col + 1;
}

guint
value_area_get_height (Value *v)
{
	g_return_val_if_fail (v, 0);
	g_return_val_if_fail (v->type == VALUE_ARRAY ||
			      v->type == VALUE_CELLRANGE, 1);
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	if (v->type == VALUE_ARRAY)
		return v->v.array.y;
	else
		return v->v.cell_range.cell_b.row -
		       v->v.cell_range.cell_a.row + 1;
}

const Value *
value_area_get_at_x_y (Value *v, guint x, guint y)
{
	g_return_val_if_fail (v, 0);
	g_return_val_if_fail (v->type == VALUE_ARRAY ||
			      v->type == VALUE_CELLRANGE,
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			      value_int (0));

	if (v->type == VALUE_ARRAY){
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		g_return_val_if_fail (v->v.array.x < x &&
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				      v->v.array.y < y,
				      value_int (0));
		return &v->v.array.vals [x][y];
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	} else {
		CellRef *a, *b;
		Cell *cell;
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		a = &v->v.cell_range.cell_a;
		b = &v->v.cell_range.cell_b;
		g_return_val_if_fail (!a->col_relative,
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				      value_int (0));
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		g_return_val_if_fail (!b->col_relative,
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				      value_int (0));
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		g_return_val_if_fail (!a->row_relative,
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				      value_int (0));
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		g_return_val_if_fail (!b->row_relative,
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				      value_int (0));
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		g_return_val_if_fail (a->col<=b->col,
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				      value_int (0));
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		g_return_val_if_fail (a->row<=b->row,
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				      value_int (0));
		
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		cell = sheet_cell_get (a->sheet, a->col+x, a->row+y);
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		if (cell && cell->value)
			return cell->value;
		else
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			return value_int (0);
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	}
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	return value_int (0);
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}

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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;
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	cell_ref->row_relative = 0;
	cell_ref->col_relative = 0;
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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;
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	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:
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		res->v.v_int = value->v.v_int;
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		break;
		
	case VALUE_FLOAT:
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		res->v.v_float = value->v.v_float;
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		break;
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	case VALUE_ARRAY:
		g_warning ("VALUE_ARRAY not handled in eval_cell_value\n");
		res->type = VALUE_INTEGER;
		res->v.v_int = 0;
		break;
			
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	case VALUE_CELLRANGE:
		res->v.cell_range = value->v.cell_range;
		break;
	}
	return res;
}

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static void
free_values (Value **values, int top)
{
	int i;
	
	for (i = 0; i < top; i++)
		value_release (values [i]);
	g_free (values);
}

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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;
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		int fn_argc_min = 0, fn_argc_max = 0, var_len = 0;
		char *arg_type = fd->args;
		char *argptr = fd->args;
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		/* Get variable limits */
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		while (*argptr){
			if (*argptr++ == '|'){
				var_len = 1;
				continue;
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			}
			if (!var_len)
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				fn_argc_min++;
			fn_argc_max++;
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		}
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		if (argc > fn_argc_max || argc < fn_argc_min){
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			*error_string = _("Invalid number of arguments");
			return NULL;
		}

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		values = g_new (Value *, fn_argc_max);
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		for (arg = 0; l; l = l->next, arg++, arg_type++){
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			ExprTree *t = (ExprTree *) l->data;
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			int type_mismatch = 0;
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			if (*arg_type=='|')
				arg_type++;
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			if ((*arg_type != 'A' &&          /* This is so a cell reference */
			     *arg_type != 'r') ||         /* can be converted to a cell range */
			    !t || (t->oper != OPER_VAR)) { /* without being evaluated */
				if ((v = eval_expr (sheet, t, eval_col,
						    eval_row, error_string))==NULL)
					goto free_list;
			} else {
				g_assert (t->oper == OPER_VAR);
				v = value_cellrange (&t->u.ref,
						     &t->u.ref);
				if (!v->v.cell_range.cell_a.sheet)
					v->v.cell_range.cell_a.sheet = sheet;
				if (!v->v.cell_range.cell_b.sheet)
					v->v.cell_range.cell_b.sheet = sheet;
			}
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			switch (*arg_type){
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			case 'f':
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				if (v->type != VALUE_INTEGER &&
				    v->type != VALUE_FLOAT)
					type_mismatch = 1;
				break;
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			case 's':
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				if (v->type != VALUE_STRING)
					type_mismatch = 1;
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				break;
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			case 'r':
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				if (v->type != VALUE_CELLRANGE)
					type_mismatch = 1;
				else {
					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);
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				}
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				break;
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			case 'a':
				if (v->type != VALUE_ARRAY)
					type_mismatch = 1;
				break;
			case 'A':
				if (v->type != VALUE_ARRAY &&
				    v->type != VALUE_CELLRANGE)
					type_mismatch = 1;
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				if (v->type == VALUE_CELLRANGE) {
					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);
				}
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				break;
			}
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			if (type_mismatch){
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				free_values (values, arg);
				*error_string = _("Type mismatch");
				return NULL;
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			}
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			values [arg] = v;
		}
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		while (arg < fn_argc_max)
			values [arg++] = NULL;
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		v = fd->fn (fd, values, error_string);
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	free_list:
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		for (i = 0; i < arg; i++){
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			if (values [i] != NULL)
				value_release (values [i]);
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		}
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		g_free (values);
		return v;
	}
	return v;
}

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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++){
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				tree [i].oper = OPER_CONSTANT;
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				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 *
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function_call_with_values (Sheet *sheet, const char *name, int argc, Value *values[], char **error_string)
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{
	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);

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	sym = symbol_lookup (global_symbol_table, name);
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	if (sym == NULL){
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		*error_string = _("Function does not exist");
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		return NULL;
	}
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	if (sym->type != SYMBOL_FUNCTION){
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		*error_string = _("Calling non-function");
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		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;
}

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typedef enum {
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	IS_EQUAL,
	IS_LESS,
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	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;
}
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/*
 * Compares two (Value *) and returns one of compare_t
 */
static compare_t
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compare (Value *a, Value *b)
{
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	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;
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}

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Value *
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eval_expr (Sheet *sheet, ExprTree *tree, int eval_col, int eval_row, char **error_string)
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{
	Value *a, *b, *res;
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	g_return_val_if_fail (tree != NULL, NULL);
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	g_return_val_if_fail (sheet != NULL, NULL);
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	g_return_val_if_fail (error_string != NULL, NULL);
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	g_return_val_if_fail (IS_SHEET (sheet), NULL);
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	switch (tree->oper){
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	case OPER_EQUAL:
	case OPER_NOT_EQUAL:
	case OPER_GT:
	case OPER_GTE:
	case OPER_LT:
	case OPER_LTE: {
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		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);

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		if (comp == TYPE_ERROR){
			value_release (a);
			value_release (b);
			*error_string = _("Type error");
			return NULL;
		}
		
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		switch (tree->oper){
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		case OPER_EQUAL:
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			res->v.v_int = comp == IS_EQUAL;
			break;

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		case OPER_GT:
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			res->v.v_int = comp == IS_GREATER;
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			break;

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		case OPER_LT:
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			res->v.v_int = comp == IS_LESS;
			break;

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		case OPER_LTE:
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			res->v.v_int = (comp == IS_EQUAL || comp == IS_LESS);
			break;

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		case OPER_GTE:
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			res->v.v_int = (comp == IS_EQUAL || comp == IS_GREATER);
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			break;

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		case OPER_NOT_EQUAL:
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			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;
	}
	
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	case OPER_ADD:
	case OPER_SUB:
	case OPER_MULT:
	case OPER_DIV:
	case OPER_EXP:
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		a = eval_expr (sheet, tree->u.binary.value_a,
			       eval_col, eval_row, error_string);
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		if (!a)
			return NULL;
		
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		b = eval_expr (sheet, tree->u.binary.value_b,
			       eval_col, eval_row, error_string);
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		if (!b){
			value_release (a);
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			return NULL;
		}
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		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){
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			int ia = a->v.v_int;
			int ib = b->v.v_int;
			
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			res->type = VALUE_INTEGER;
			
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			switch (tree->oper){
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			case OPER_SUB:
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			case OPER_ADD: {
				int sum;

				if (tree->oper == OPER_SUB){
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					ib = -ib;
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				}

				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;
				
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				break;
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			}
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			case OPER_MULT:
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				res->v.v_int = a->v.v_int * b->v.v_int;
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				break;
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			case OPER_DIV:
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				if (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;
				}
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				res->type = VALUE_FLOAT;
				res->v.v_float =  a->v.v_int / (float_t)b->v.v_int;
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				break;
				
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			case OPER_EXP: 
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				res->v.v_int = pow (a->v.v_int, b->v.v_int);
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				break;
			default:
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				break;
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			}
		} else {
			res->type = VALUE_FLOAT;
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			res->v.v_float = 0.0;
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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 OPER_ADD:
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				res->v.v_float = a->v.v_float + b->v.v_float;
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				break;
				
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			case OPER_SUB:
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				res->v.v_float = a->v.v_float - b->v.v_float;
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				break;
				
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			case OPER_MULT:
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				res->v.v_float = a->v.v_float * b->v.v_float;
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				break;
				
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			case OPER_DIV:
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				if (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;
				}
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				res->v.v_float = a->v.v_float / b->v.v_float;
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				break;
				
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			case OPER_EXP:
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				res->v.v_float = pow (a->v.v_float, b->v.v_float);
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				break;
			default:
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				break;
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			}
		}
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		value_release (a);
		value_release (b);
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		return res;
		
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	case OPER_CONCAT: {
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		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);
		
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		tmp = g_strconcat (sa, sb, NULL);
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		res->v.str = string_get (tmp);
		g_free (sa);
		g_free (sb);
		g_free (tmp);

		value_release (a);
		value_release (b);
		return res;
	}
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	case OPER_FUNCALL:
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		return eval_funcall (sheet, tree, eval_col, eval_row, error_string);
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	case OPER_VAR: {
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		Sheet *cell_sheet;
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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.ref;
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		cell_get_abs_col_row (ref, eval_col, eval_row, &col, &row);
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		cell_sheet = ref->sheet ? ref->sheet : sheet;
		
		cell = sheet_cell_get (cell_sheet, col, row);
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		if (cell){
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			if (cell->generation != sheet->workbook->generation){
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				cell->generation = sheet->workbook->generation;
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				if (cell->parsed_node)
					cell_eval (cell);
			}

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			if (cell->value)
				return eval_cell_value (sheet, cell->value);
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			else {
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				if (cell->text)
					*error_string = cell->text->str;
				else
					*error_string = _("Reference to newborn cell");
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				return NULL;
			}
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		}
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		res = g_new (Value, 1);
			
		res->type = VALUE_INTEGER;
		res->v.v_int = 0;
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		return res;
	}
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	case OPER_CONSTANT:
		return eval_cell_value (sheet, tree->u.constant);

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	case OPER_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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