expr.c 41 KB
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/*
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 * expr.c: Expression evaluation in Gnumeric
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 *
 * 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 <locale.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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#include "utils.h"
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EvalPosition *
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eval_pos_init (EvalPosition *eval_pos, Sheet *sheet, int col, int row)
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{
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	g_return_val_if_fail (sheet != NULL, NULL);
	g_return_val_if_fail (eval_pos != NULL, NULL);
	g_return_val_if_fail (IS_SHEET (sheet), NULL);

	eval_pos->sheet = sheet;
	eval_pos->eval_col = col;
	eval_pos->eval_row = row;
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	return eval_pos;
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}
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ParsePosition *
parse_pos_init (ParsePosition *pp, Workbook *wb, int col, int row)
{
	g_return_val_if_fail (wb != NULL, NULL);
	g_return_val_if_fail (pp != NULL, NULL);

	pp->wb  = wb;
	pp->col = col;
	pp->row = row;

	return pp;
}

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EvalPosition *
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eval_pos_cell (EvalPosition *eval_pos, Cell *cell)
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{
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	g_return_val_if_fail (eval_pos != NULL, NULL);
	g_return_val_if_fail (cell != NULL, NULL);
	g_return_val_if_fail (cell->sheet != NULL, NULL);
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	g_return_val_if_fail (IS_SHEET (cell->sheet), NULL);

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	return eval_pos_init (
		eval_pos,
		cell->sheet,
		cell->col->pos,
		cell->row->pos);
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}
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ParsePosition *
parse_pos_cell (ParsePosition *pp, Cell *cell)
{
	g_return_val_if_fail (pp != NULL, NULL);
	g_return_val_if_fail (cell != NULL, NULL);
	g_return_val_if_fail (cell->sheet != NULL, NULL);
	g_return_val_if_fail (IS_SHEET (cell->sheet), NULL);
	g_return_val_if_fail (cell->sheet->workbook != NULL, NULL);

	return parse_pos_init (
		pp,
		cell->sheet->workbook,
		cell->col->pos,
		cell->row->pos);
}

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FunctionEvalInfo *
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func_eval_info_init (FunctionEvalInfo *eval_info, Sheet *sheet, int col, int row)
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{
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	g_return_val_if_fail (eval_info != NULL, NULL);
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	eval_pos_init (&eval_info->pos, sheet, col, row);
	eval_info->func_def = 0;
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	return eval_info;
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}

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FunctionEvalInfo *
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func_eval_info_cell (FunctionEvalInfo *eval_info, Cell *cell)
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{
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	g_return_val_if_fail (eval_info != NULL, NULL);
	g_return_val_if_fail (cell != NULL, NULL);
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	return func_eval_info_init (
		eval_info, cell->sheet,
		cell->col->pos, cell->row->pos);
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}

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FunctionEvalInfo *
func_eval_info_pos (FunctionEvalInfo *eval_info, const EvalPosition *eval_pos)
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{
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	g_return_val_if_fail (eval_info != NULL, NULL);
	g_return_val_if_fail (eval_pos != NULL, NULL);
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	return func_eval_info_init (
		eval_info,
		eval_pos->sheet,
		eval_pos->eval_col,
		eval_pos->eval_row);
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}

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ExprTree *
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expr_tree_new_constant (Value *v)
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{
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	ExprTree *ans;

	ans = g_new (ExprTree, 1);
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	if (!ans)
		return NULL;
	
	ans->ref_count = 1;
	ans->oper = OPER_CONSTANT;
	ans->u.constant = v;

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	return ans;
}

ExprTree *
expr_tree_new_unary  (Operation op, ExprTree *e)
{
	ExprTree *ans;

	ans = g_new (ExprTree, 1);
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	if (!ans)
		return NULL;

	ans->ref_count = 1;
	ans->oper = op;
	ans->u.value = e;

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	return ans;
}


ExprTree *
expr_tree_new_binary (ExprTree *l, Operation op, ExprTree *r)
{
	ExprTree *ans;

	ans = g_new (ExprTree, 1);
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	if (!ans)
		return NULL;
	
	ans->ref_count = 1;
	ans->oper = op;
	ans->u.binary.value_a = l;
	ans->u.binary.value_b = r;

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	return ans;
}

ExprTree *
expr_tree_new_funcall (Symbol *sym, GList *args)
{
	ExprTree *ans;
	g_return_val_if_fail (sym, NULL);

	ans = g_new (ExprTree, 1);
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	if (!ans)
		return NULL;
	
	ans->ref_count = 1;
	ans->oper = OPER_FUNCALL;
	ans->u.function.symbol = sym;;
	ans->u.function.arg_list = args;

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	return ans;
}
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int
expr_tree_get_const_int (ExprTree const * const expr)
{
	g_return_val_if_fail (expr != NULL, 0);
	g_return_val_if_fail (expr->oper == OPER_CONSTANT, 0);
	g_return_val_if_fail (expr->u.constant, 0);
	g_return_val_if_fail (expr->u.constant->type == VALUE_INTEGER, 0);

	return expr->u.constant->v.v_int;
}

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char const *
expr_tree_get_const_str (ExprTree const *const expr)
{
	g_return_val_if_fail (expr != NULL, NULL);
	g_return_val_if_fail (expr->oper == OPER_CONSTANT, NULL);
	g_return_val_if_fail (expr->u.constant, NULL);
	g_return_val_if_fail (expr->u.constant->type == VALUE_STRING, NULL);

	return expr->u.constant->v.str->str;
}

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ExprTree *
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expr_parse_string (const char *expr, const ParsePosition *pp,
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		   const char **desired_format, char **error_msg)
{
	ExprTree *tree;
	g_return_val_if_fail (expr != NULL, NULL);

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	switch (gnumeric_expr_parser (expr, pp, desired_format, &tree)) {
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	case PARSE_OK:
		*error_msg = NULL;
		tree->ref_count = 1;
		return tree;

	case PARSE_ERR_SYNTAX:
		*error_msg = _("Syntax error");
		break;

	case PARSE_ERR_NO_QUOTE:
		*error_msg = _("Missing quote");
		break;
	default:
		g_assert_not_reached ();
		*error_msg = _("Impossible!");
		break;
	}
	return NULL;
}

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ExprTree *
expr_tree_new_name (const ExprName *name)
{
	ExprTree *ans;

	ans = g_new (ExprTree, 1);
	if (!ans)
		return NULL;
	
	ans->ref_count = 1;
	ans->oper = OPER_NAME;
	ans->u.name = name;

	return ans;
}
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/*ExprTree *
expr_tree_new (void)
{
	ExprTree *ans;

	ans = g_new (ExprTree, 1);
	if (!ans)
		return NULL;
	
	ans->ref_count = 1;
	ans->oper = OPER_CONSTANT;
	ans->u.constant = NULL;
	return ans;
}*/
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ExprTree *
expr_tree_new_var (const CellRef *cr)
{
	ExprTree *ans;

	ans = g_new (ExprTree, 1);
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	if (!ans)
		return NULL;
	
	ans->ref_count = 1;
	ans->oper = OPER_VAR;
	ans->u.ref = *cr;

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	return ans;
}

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ExprTree *
expr_tree_new_error (const char *txt)
{
	Symbol *func;
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	GList *args = NULL;

	if (strcmp (txt, gnumeric_err_NA) == 0) {
		func = symbol_lookup (global_symbol_table, "NA");
	} else {
		func = symbol_lookup (global_symbol_table, "ERROR");
		args = g_list_prepend (NULL,
				       expr_tree_new_constant (value_new_string (txt)));
	}
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	symbol_ref (func);
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	return expr_tree_new_funcall (func, args);
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}

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ExprTree *
expr_tree_array_formula (int const x, int const y, int const rows, int const cols)
{
	ExprTree *ans;

	ans = g_new (ExprTree, 1);
	if (ans == NULL)
		return NULL;
	
	ans->ref_count = 1;
	ans->oper = OPER_ARRAY;
	ans->u.array.x = x;
	ans->u.array.y = y;
	ans->u.array.rows = rows;
	ans->u.array.cols = cols;
	ans->u.array.corner.func.value = NULL;
	ans->u.array.corner.func.expr = NULL;
	ans->u.array.corner.cell = NULL;
	return ans;
}


static ExprTree *
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expr_tree_array_formula_corner (ExprTree const *expr)
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{
	Cell * const corner = expr->u.array.corner.cell;

	g_return_val_if_fail (corner, NULL);
	g_return_val_if_fail (corner->parsed_node != NULL, NULL);

	/* Sanity check incase the corner gets removed for some reason */
	g_return_val_if_fail (corner->parsed_node != (void *)0xdeadbeef, NULL);
	g_return_val_if_fail (corner->parsed_node->oper == OPER_ARRAY, NULL);

	return corner->parsed_node;
}

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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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	tree->ref_count++;
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}

static void
do_expr_tree_unref (ExprTree *tree)
{
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	if (--tree->ref_count > 0)
		return;

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	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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		value_release (tree->u.constant);
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		break;
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	case OPER_FUNCALL: {
		GList *l;

		for (l = tree->u.function.arg_list; l; l = l->next)
			do_expr_tree_unref (l->data);
		g_list_free (tree->u.function.arg_list);
		symbol_unref (tree->u.function.symbol);
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		break;
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	}
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	case OPER_NAME:
		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;
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	case OPER_ARRAY:
		if (tree->u.array.x == 0 && tree->u.array.y == 0)
			do_expr_tree_unref (tree->u.array.corner.func.expr);
		break;
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	default:
		g_warning ("do_expr_tree_unref error\n");
		break;
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	}
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	g_free (tree);
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}

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/*
 * expr_tree_unref:
 * Decrements the ref_count for part of a tree.  (All trees are expected
 * to have been created with a ref-count of one, so when we hit zero, we
 * go down over the tree and unref the tree and its leaves stuff.)
 */
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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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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)
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		cell_ref->col = eval_col + cell_ref->col;
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	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 void
cell_ref_restore_absolute (CellRef *cell_ref, const CellRef *orig, int eval_col, int eval_row)
{
	if (orig->col_relative) {
		cell_ref->col -= eval_col;
		cell_ref->col_relative = 1;
	}

	if (orig->row_relative) {
		cell_ref->row -= eval_row;
		cell_ref->row_relative = 1;
	}
}

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

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static Value *
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eval_funcall (FunctionEvalInfo *s, ExprTree const *tree)
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{
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	const Symbol *sym;
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	FunctionDefinition *fd;
	GList *l;
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	int argc, arg;
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	Value *v = NULL;
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	Sheet *sheet;
	int eval_col;
	int eval_row;

	g_return_val_if_fail (s, NULL);
	g_return_val_if_fail (tree, NULL);
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	sym = tree->u.function.symbol;
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	sheet    = s->pos.sheet;
	eval_col = s->pos.eval_col;
	eval_row = s->pos.eval_row;

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	l = tree->u.function.arg_list;
	argc = g_list_length (l);

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	if (sym->type != SYMBOL_FUNCTION)
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		return value_new_error (&s->pos, _("Internal error"));
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	fd = (FunctionDefinition *)sym->data;
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	s->func_def = fd;
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	if (fd->fn_type == FUNCTION_NODES) {
		/* Functions that deal with ExprNodes */		
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		v = fd->fn.fn_nodes (s, l);
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	} else {
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		/* Functions that take pre-computed Values */
		Value **values;
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		int fn_argc_min = 0, fn_argc_max = 0, var_len = 0;
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		const char *arg_type = fd->args;
		const 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)
			return value_new_error (&s->pos, _("Invalid number of arguments"));
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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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			gboolean type_mismatch = FALSE;
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			Value *v;
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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 */
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				if ((v = eval_expr_real (s, t)) == NULL)
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					goto free_list;
			} else {
				g_assert (t->oper == OPER_VAR);
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				v = value_new_cellrange (&t->u.ref,
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							 &t->u.ref);
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			}
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			switch (*arg_type){
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			case 'f':
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			case 'b':
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				/*
				 * Handle the implicit union of a single row or
				 * column with the eval position
				 */
				if (v->type == VALUE_CELLRANGE) {
					CellRef a = v->v.cell_range.cell_a;
					CellRef b = v->v.cell_range.cell_b;
					cell_ref_make_absolute (&a, eval_col,
								eval_row);
					cell_ref_make_absolute (&b, eval_col,
								eval_row);

					if (a.sheet !=  b.sheet)
						type_mismatch = TRUE;
					else if (a.row == b.row) {
						int const c = s->pos.eval_col;
						if (a.col <= c && c <= b.col)
							v = value_duplicate(value_area_get_x_y (&s->pos, v, c - a.col, 0));
						else
							type_mismatch = TRUE;
					} else if (a.col == b.col) {
						int const r = s->pos.eval_row;
						if (a.row <= r && r <= b.row)
							v = value_duplicate(value_area_get_x_y (&s->pos, v, 0, r - a.row));
						else
							type_mismatch = TRUE;
					} else
						type_mismatch = TRUE;
				} else if (v->type != VALUE_INTEGER &&
					 v->type != VALUE_FLOAT &&
					 v->type != VALUE_BOOLEAN)
					type_mismatch = TRUE;
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				break;
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			case 's':
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				if (v->type != VALUE_STRING)
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					type_mismatch = TRUE;
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				break;
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			case 'r':
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				if (v->type != VALUE_CELLRANGE)
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					type_mismatch = TRUE;
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				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)
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					type_mismatch = TRUE;
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				break;
			case 'A':
				if (v->type != VALUE_ARRAY &&
				    v->type != VALUE_CELLRANGE)
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					type_mismatch = TRUE;
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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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			values [arg] = v;
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			if (type_mismatch){
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				free_values (values, arg + 1);
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				return value_new_error (&s->pos,
							gnumeric_err_VALUE);
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			}
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		}
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		while (arg < fn_argc_max)
			values [arg++] = NULL;
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		v = fd->fn.fn_args (s, values);
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	free_list:
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		free_values (values, arg);
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	}
	return v;
}

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typedef enum {
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	IS_EQUAL,
	IS_LESS,
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	IS_GREATER,
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	TYPE_MISMATCH
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} 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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static gboolean
is_null_string (Value const *v)
{
	return v != NULL && v->type == VALUE_STRING && v->v.str->str[0] == '\0';
}

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/*
 * Compares two (Value *) and returns one of compare_t
 */
static compare_t
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compare (const Value *a, const Value *b)
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{
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	/* Handle trivial and double NULL case */
	if (a == b)
		return IS_EQUAL;

	if (a == NULL)
		return is_null_string (b) ? IS_EQUAL : TYPE_MISMATCH;
	if (b == NULL)
		return is_null_string (a) ? IS_EQUAL : TYPE_MISMATCH;

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	if (a->type == VALUE_BOOLEAN){
		gboolean err, b_val = value_get_as_bool (b, &err);

		if (err)
			return TYPE_MISMATCH;

		if (a->v.v_bool)
			return (b_val) ? IS_EQUAL : IS_GREATER;
		return (b_val) ? IS_LESS : IS_EQUAL;
	}
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	if (a->type == VALUE_INTEGER){
		int f;
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		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:
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			f = value_get_as_float (b);
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			return compare_float_float (a->v.v_int, f);

		default:
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			return TYPE_MISMATCH;
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		}
	}
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	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:
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			f = value_get_as_float (b);
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			return compare_float_float (a->v.v_float, f);

		default:
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			return TYPE_MISMATCH;
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		}
	}

	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;
	}

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	return TYPE_MISMATCH;
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}

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/*
 * Utility routine to ensure that all elements of a range are recalced as
 * necessary.
 */
static void
eval_range (FunctionEvalInfo *s, Value *v)
{
	int start_col, start_row, end_col, end_row;
	CellRef * a = &v->v.cell_range.cell_a;
	CellRef * b = &v->v.cell_range.cell_b;
	Sheet * sheet = a->sheet ? a->sheet : s->pos.sheet;
	Cell * cell;
	int r, c;
	int const gen = s->pos.sheet->workbook->generation;

	cell_get_abs_col_row (a,
			      s->pos.eval_col, s->pos.eval_row,
			      &start_col, &start_row);
	cell_get_abs_col_row (b,
			      s->pos.eval_col, s->pos.eval_row,
			      &end_col, &end_row);

	if (a->sheet != b->sheet) {
		g_warning ("3D references not-fully supported.\n"
			   "Recalc may be incorrect");
		return;
	}

	for (r = start_row; r <= end_row; ++r)
		for (c = start_col; c <= end_col; ++c) {
			if ((cell = sheet_cell_get (sheet, c, r)) == NULL)
				continue;
			if (cell->generation != gen) {
				cell->generation = gen;
				if (cell->parsed_node &&
				    (cell->flags & CELL_QUEUED_FOR_RECALC))
					cell_eval (cell);
			}

		}
}

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Value *
eval_expr_real (FunctionEvalInfo *s, ExprTree const *tree)
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{
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	Value *res = NULL, *a = NULL, *b = NULL;
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	g_return_val_if_fail (tree != NULL, NULL);
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	g_return_val_if_fail (s != NULL, NULL);
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	/* FIXME FIXME : We need to rework support for
	 * ranges and builtin operators to support the
	 * implicit intersection rule AND figure out
	 * how to turn it off when evaluating as an array
	 */
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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;
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		a = eval_expr_real (s, tree->u.binary.value_a);
		b = eval_expr_real (s, tree->u.binary.value_b);
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		comp = compare (a, b);

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		if (a != NULL)
			value_release (a);
		if (b != NULL)
			value_release (b);

		if (comp == TYPE_MISMATCH){
			/* TODO TODO TODO : Make error more informative
			 *    regarding what is comparing to what
			 */
			/* For equality comparisons even errors are ok */
			if (tree->oper == OPER_EQUAL)
				return value_new_bool (FALSE);
			if (tree->oper == OPER_NOT_EQUAL)
				return value_new_bool (TRUE);

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			return value_new_error (&s->pos, _("Type Mismatch"));
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		}
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		switch (tree->oper){
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		case OPER_EQUAL:
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			res = value_new_bool (comp == IS_EQUAL);
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			break;

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		case OPER_GT:
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			res = value_new_bool (comp == IS_GREATER);
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			break;

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		case OPER_LT:
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			res = value_new_bool (comp == IS_LESS);
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			break;

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		case OPER_NOT_EQUAL:
			res = value_new_bool (comp != IS_EQUAL);
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			break;

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		case OPER_LTE:
			res = value_new_bool (comp != IS_GREATER);
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			break;

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		case OPER_GTE:
			res = value_new_bool (comp != IS_LESS);
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			break;
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		default:
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			g_assert_not_reached ();
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			res = value_new_error (&s->pos,
						_("Internal type error"));
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		}
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		return res;
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	}
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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_real (s, tree->u.binary.value_a);
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		if (VALUE_IS_PROBLEM(a))
			return a;
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		b = eval_expr_real (s, tree->u.binary.value_b);
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		if (VALUE_IS_PROBLEM(b)){
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			value_release (a);
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			return b;
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		}
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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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			return value_new_error (&s->pos, _("Type mismatch"));
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		}
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		res = g_new (Value, 1);
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		if (a->type != VALUE_FLOAT && b->type != VALUE_FLOAT){
			int ia = value_get_as_int (a);
			int ib = value_get_as_int (b);
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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;
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				if ((ia > 0) && (ib > 0)){
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					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 = ia * ib;
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				break;
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			case OPER_DIV:
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				if (ib == 0){
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					value_release (a);
					value_release (b);
					value_release (res);
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					return value_new_error (&s->pos, gnumeric_err_DIV0);
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				}
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				res->type = VALUE_FLOAT;
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				res->v.v_float =  ia / (float_t)ib;
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				break;
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			case OPER_EXP:
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				res->v.v_int = pow (ia, ib);
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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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					return value_new_error (&s->pos, gnumeric_err_DIV0);
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				}
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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;

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		a = eval_expr_real (s, tree->u.binary.value_a);
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		if (VALUE_IS_PROBLEM(a))
			return a;
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		b = eval_expr_real (s, tree->u.binary.value_b);
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		if (VALUE_IS_PROBLEM(b)) {
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			value_release (a);
			return NULL;
		}

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		sa = value_get_as_string (a);
		sb = value_get_as_string (b);
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		tmp = g_strconcat (sa, sb, NULL);
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		res = value_new_string (tmp);

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		g_free (sa);
		g_free (sb);
		g_free (tmp);

		value_release (a);
		value_release (b);
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		return res;
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	}
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	case OPER_FUNCALL:
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		return eval_funcall (s, tree);
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	case OPER_NAME:
		return eval_expr_name (s, tree->u.name);

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	case OPER_VAR: {
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		Sheet *cell_sheet;
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		CellRef const *ref;
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		Cell *cell;
		int col, row;
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		if (s->pos.sheet == NULL) {
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			/* Only the test program requests this */
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			return value_new_float (3.14);
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		}

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		ref = &tree->u.ref;
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		cell_get_abs_col_row (ref, s->pos.eval_col, s->pos.eval_row, &col, &row);
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		cell_sheet = eval_sheet (ref->sheet, s->pos.sheet);
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		cell = sheet_cell_get (cell_sheet, col, row);
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		if (cell == NULL)
			return NULL;
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		if (cell->generation != s->pos.sheet->workbook->generation){
			cell->generation = s->pos.sheet->workbook->generation;
			if (cell->parsed_node && (cell->flags & CELL_QUEUED_FOR_RECALC))
				cell_eval (cell);
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		}
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		return value_duplicate (cell->value);
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	}
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	case OPER_CONSTANT:
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		res = tree->u.constant;
		if (res->type == VALUE_CELLRANGE)
			eval_range (s, res);
		return value_duplicate (res);
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	case OPER_NEG:
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		a = eval_expr_real (s, tree->u.value);
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		if (VALUE_IS_PROBLEM(a))
			return a;
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		if (!VALUE_IS_NUMBER (a)){
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			value_release (a);
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			return value_new_error (&s->pos, _("Type mismatch"));
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		}
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		if (a->type == VALUE_INTEGER)
			res = value_new_int (-a->v.v_int);
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		else if (a->type == VALUE_FLOAT)
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			res = value_new_float (-a->v.v_float);
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		else
			res = value_new_bool (!a->v.v_float);
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		value_release (a);
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		return res;
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	case OPER_ARRAY:
	{
		/* The upper left corner manages the recalc of the expr */
		int const x = tree->u.array.x;
		int const y = tree->u.array.y;
		if (x == 0 && y == 0){
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			/* Release old value if necessary */
			a = tree->u.array.corner.func.value;
			if (a != NULL)
				value_release (a);

			/* Store real result (cast away const)*/
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			a = eval_expr_real (s, tree->u.array.corner.func.expr);
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			*((Value **)&(tree->u.array.corner.func.value)) = a;
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		} else {
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			ExprTree const * const array =
			    expr_tree_array_formula_corner (tree);
			if (array)
				a = array->u.array.corner.func.value;
			else
				a = NULL;
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		}
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		if (a != NULL &&
		    (a->type == VALUE_CELLRANGE || a->type == VALUE_ARRAY)) {
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			int const num_x = value_area_get_width (&s->pos, a);
			int const num_y = value_area_get_height (&s->pos, a);
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			if (x < num_x && y < num_y){
				/* Evaluate relative to the upper left corner */
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				EvalPosition tmp_ep = s->pos;
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				tmp_ep.eval_col -= x;
				tmp_ep.eval_row -= y;
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				a = (Value *)value_area_get_x_y (
					&tmp_ep, a, x, y);
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			} else
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				return value_new_error (&s->pos, gnumeric_err_NA);
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		} else if (x >= 1 || y >= 1)
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			return value_new_error (&s->pos, gnumeric_err_NA);
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		if (a == NULL)
			return NULL;
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		return value_duplicate (a);
	}
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	}
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	return value_new_error (&s->pos, _("Unknown evaluation error"));
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}

Value *
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eval_expr (FunctionEvalInfo *s, ExprTree const *tree)
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{
	Value * res = eval_expr_real (s, tree);
	if (res != NULL)
		return res;
	return value_new_int (0);
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}
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int
cell_ref_get_abs_col(CellRef const *ref, EvalPosition const *pos)
{
	g_return_val_if_fail (ref != NULL, 0);
	g_return_val_if_fail (pos != NULL, 0);

	if (ref->col_relative)
		return pos->eval_col + ref->col;
	return ref->col;

}

int
cell_ref_get_abs_row(CellRef