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/* This file is part of the KDE project
Copyright (C) 1998-2002 The KSpread Team
www.koffice.org/kspread
Copyright (C) 2005 Tomas Mecir <mecirt@gmail.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
// built-in logical functions
#include "functions.h"
#include "valuecalc.h"
#include "valueconverter.h"
using namespace KSpread;
// prototypes (sorted alphabetically)
Value func_and (valVector args, ValueCalc *calc, FuncExtra *);
Value func_false (valVector args, ValueCalc *calc, FuncExtra *);
Value func_if (valVector args, ValueCalc *calc, FuncExtra *);
Value func_nand (valVector args, ValueCalc *calc, FuncExtra *);
Value func_nor (valVector args, ValueCalc *calc, FuncExtra *);
Value func_not (valVector args, ValueCalc *calc, FuncExtra *);
Value func_or (valVector args, ValueCalc *calc, FuncExtra *);
Value func_true (valVector args, ValueCalc *calc, FuncExtra *);
Value func_xor (valVector args, ValueCalc *calc, FuncExtra *);
// registers all logic functions
void RegisterLogicFunctions()
{
FunctionRepository* repo = FunctionRepository::self();
Function *f;
f = new Function ("FALSE", func_false);
f->setParamCount (0);
repo->add (f);
f = new Function ("TRUE", func_true);
f->setParamCount (0);
repo->add (f);
f = new Function ("NOT", func_not);
f->setParamCount (1);
repo->add (f);
f = new Function ("AND", func_and);
f->setParamCount (1, -1);
f->setAcceptArray ();
repo->add (f);
f = new Function ("NAND", func_nand);
f->setParamCount (1, -1);
f->setAcceptArray ();
repo->add (f);
f = new Function ("NOR", func_nor);
f->setParamCount (1, -1);
f->setAcceptArray ();
repo->add (f);
f = new Function ("OR", func_or);
f->setParamCount (1, -1);
f->setAcceptArray ();
repo->add (f);
f = new Function ("XOR", func_xor);
f->setParamCount (1, -1);
f->setAcceptArray ();
repo->add (f);
f = new Function ("IF", func_if);
f->setParamCount (3);
repo->add (f);
}
// Function: FALSE
Value func_false (valVector, ValueCalc *, FuncExtra *)
{
return Value (false);
}
// Function: TRUE
Value func_true (valVector, ValueCalc *, FuncExtra *)
{
return Value (true);
}
// helper for most logical functions
bool asBool (Value val, ValueCalc *calc)
{
return calc->conv()->asBoolean (val).asBoolean ();
}
// Function: NOT
Value func_not (valVector args, ValueCalc *calc, FuncExtra *)
{
bool val = asBool (args[0], calc) ? false : true;
return Value (val);
}
// Function: OR
void awOr (ValueCalc *calc, Value &res, Value value, Value)
{
if (! res.asBoolean())
res = Value ( asBool (value, calc) );
}
Value func_or (valVector args, ValueCalc *calc, FuncExtra *)
{
Value result(false);
int cnt = args.count();
for (int i = 0; i < cnt; ++i) {
calc->arrayWalk (args[i], result, awOr, 0);
if (result.asBoolean())
// if any value is true, return true
return result;
}
// nothing is true -> return false
return result;
}
// Function: NOR
Value func_nor (valVector args, ValueCalc *calc, FuncExtra *extra)
{
// OR in reverse
return Value(! func_or(args, calc, extra).asBoolean());
}
// Function: AND
void awAnd (ValueCalc *calc, Value &res, Value value, Value)
{
if (res.asBoolean())
res = Value ( asBool (value, calc) );
}
Value func_and (valVector args, ValueCalc *calc, FuncExtra *)
{
Value result(true);
int cnt = args.count();
for (int i = 0; i < cnt; ++i) {
calc->arrayWalk (args[i], result, awAnd, 0);
if (! result.asBoolean())
// if any value is false, return false
return result;
}
// nothing is false -> return true
return result;
}
// Function: NAND
Value func_nand (valVector args, ValueCalc *calc, FuncExtra *extra)
{
// AND in reverse
return Value(! func_and(args, calc, extra).asBoolean());
}
// Function: XOR
void awXor (ValueCalc *calc, Value &count, Value value, Value)
{
if (asBool (value, calc))
count = Value( count.asInteger() + 1 );
}
Value func_xor (valVector args, ValueCalc *calc, FuncExtra *)
{
// exclusive OR - exactly one value must be true
int cnt = args.count();
Value count(0);
for (int i = 0; i < cnt; ++i)
calc->arrayWalk (args[i], count, awXor, 0);
return Value (count.asInteger() == 1);
}
// Function: IF
Value func_if (valVector args, ValueCalc *calc, FuncExtra *)
{
if (asBool (args[0], calc))
return args[1];
else
return args[2];
}
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