AbaKus – a complex calculator
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/*
* function.cpp - part of abakus
* Copyright (C) 2004, 2005 Michael Pyne <michael.pyne@kdemail.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "numerictypes.h"
#include <kdebug.h>
#include <tqvaluevector.h>
#include <tqstring.h>
#include <tqregexp.h>
#include <math.h>
#include "function.h"
#include "node.h"
#include "valuemanager.h"
#include "hmath.h"
// Used to try and avoid recursive function definitions
class DupFinder : public NodeFunctor
{
public:
DupFinder(const TQString &nameToFind) :
m_name(nameToFind), m_valid(true)
{
}
virtual ~DupFinder() { }
bool isValid() const { return m_valid; }
virtual void operator()(const Node *node)
{
if(!m_valid)
return;
const BaseFunction *fn = dynamic_cast<const BaseFunction *>(node);
if(fn && fn->name() == m_name)
m_valid = false; // Duplicate detected
}
private:
TQString m_name;
bool m_valid;
};
// Define static member for FunctionManager
FunctionManager *FunctionManager::m_manager = 0;
FunctionManager *FunctionManager::instance()
{
if(!m_manager)
m_manager = new FunctionManager;
return m_manager;
}
FunctionManager::FunctionManager(TQObject *parent, const char *name) :
TQObject(parent, name)
{
m_dict.setAutoDelete(true);
}
// Dummy return value to enable static initialization in the DECL_*()
// macros.
bool FunctionManager::addFunction(const TQString &name, function_t fn, const TQString &desc)
{
Function *newFn = new Function;
TQRegExp returnTrigRE("^a(cos|sin|tan)");
TQRegExp needsTrigRE("^(cos|sin|tan)");
TQString fnName(name);
newFn->name = name;
newFn->description = desc;
newFn->fn = fn;
newFn->userDefined = false;
newFn->returnsTrig = fnName.contains(returnTrigRE);
newFn->needsTrig = fnName.contains(needsTrigRE);
m_dict.insert(name, newFn);
return false;
}
#define DECLARE_FUNC(name, fn, desc) bool dummy##name = FunctionManager::instance()->addFunction(#name, fn, desc)
// Declares a function name that is implemented by the function of a different
// name. e.g. atan -> Abakus::number_t::arctan()
#define DECLARE_FUNC2(name, fnName, desc) DECLARE_FUNC(name, &Abakus::number_t::fnName, desc)
// Declares a function name that is implemented by the function of the
// same base name.
#define DECLARE_FUNC1(name, desc) DECLARE_FUNC2(name, name, desc)
DECLARE_FUNC1(sin, "Trigonometric sine");
DECLARE_FUNC1(cos, "Trigonometric cosine");
DECLARE_FUNC1(tan, "Trigonometric tangent");
DECLARE_FUNC1(sinh, "Hyperbolic sine");
DECLARE_FUNC1(cosh, "Hyperbolic cosine");
DECLARE_FUNC1(tanh, "Hyperbolic tangent");
DECLARE_FUNC1(atan, "Inverse tangent");
DECLARE_FUNC1(acos, "Inverse cosine");
DECLARE_FUNC1(asin, "Inverse sine");
DECLARE_FUNC1(asinh, "Inverse hyperbolic sine");
DECLARE_FUNC1(acosh, "Inverse hyperbolic cosine");
DECLARE_FUNC1(atanh, "Inverse hyperbolic tangent");
DECLARE_FUNC1(abs, "Absolute value of number");
DECLARE_FUNC1(sqrt, "Square root");
DECLARE_FUNC1(ln, "Natural logarithm (base e)");
DECLARE_FUNC1(log, "Logarithm (base 10)");
DECLARE_FUNC1(exp, "Natural exponential function");
DECLARE_FUNC1(round, "Round to nearest number");
DECLARE_FUNC1(ceil, "Nearest greatest integer");
DECLARE_FUNC1(floor, "Nearest lesser integer");
DECLARE_FUNC2(int, integer, "Integral part of number");
DECLARE_FUNC1(frac, "Fractional part of number");
Function *FunctionManager::function(const TQString &name)
{
return m_dict[name];
}
// Returns true if the named identifier is a function, false otherwise.
bool FunctionManager::isFunction(const TQString &name)
{
return function(name) != 0;
}
bool FunctionManager::isFunctionUserDefined(const TQString &name)
{
const Function *fn = function(name);
return (fn != 0) && (fn->userDefined);
}
bool FunctionManager::addFunction(BaseFunction *fn, const TQString &dependantVar)
{
// First see if this function is recursive
DupFinder dupFinder(fn->name());
UnaryFunction *unFunction = dynamic_cast<UnaryFunction *>(fn);
if(unFunction && unFunction->operand()) {
unFunction->operand()->applyMap(dupFinder);
if(!dupFinder.isValid())
return false;
}
// Structure holds extra data needed to call the user defined
// function.
UserFunction *newFn = new UserFunction;
newFn->sequenceNumber = m_dict.count();
newFn->fn = fn;
newFn->varName = TQString(dependantVar);
// Now setup the Function data structure that holds the information
// we need to access and call the function later.
Function *fnTabEntry = new Function;
fnTabEntry->name = fn->name();
fnTabEntry->userFn = newFn;
fnTabEntry->returnsTrig = false;
fnTabEntry->needsTrig = false;
fnTabEntry->userDefined = true;
if(m_dict.find(fn->name()))
emit signalFunctionRemoved(fn->name());
m_dict.replace(fn->name(), fnTabEntry);
emit signalFunctionAdded(fn->name());
return true;
}
void FunctionManager::removeFunction(const TQString &name)
{
Function *fn = function(name);
// If we remove a function, we need to decrement the sequenceNumber of
// functions after this one.
if(fn && fn->userDefined) {
int savedSeqNum = fn->userFn->sequenceNumber;
// Emit before we actually remove it so that the info on the function
// can still be looked up.
emit signalFunctionRemoved(name);
delete fn->userFn;
fn->userFn = 0;
m_dict.remove(name);
TQDictIterator<Function> it(m_dict);
for (; it.current(); ++it) {
UserFunction *userFn = it.current()->userDefined ? it.current()->userFn : 0;
if(userFn && userFn->sequenceNumber > savedSeqNum)
--it.current()->userFn->sequenceNumber;
}
}
}
TQStringList FunctionManager::functionList(FunctionManager::FunctionType type)
{
TQDictIterator<Function> it(m_dict);
TQStringList functions;
switch(type) {
case Builtin:
for(; it.current(); ++it)
if(!it.current()->userDefined)
functions += it.current()->name;
break;
case UserDefined:
// We want to return the function names in the order they were
// added.
{
TQValueVector<Function *> fnTable(m_dict.count(), 0);
TQValueVector<int> sequenceNumberTable(m_dict.count(), -1);
// First find out what sequence numbers we have.
for(; it.current(); ++it)
if(it.current()->userDefined) {
int id = it.current()->userFn->sequenceNumber;
fnTable[id] = it.current();
sequenceNumberTable.append(id);
}
// Now sort the sequence numbers and return the ordered list
qHeapSort(sequenceNumberTable.begin(), sequenceNumberTable.end());
for(unsigned i = 0; i < sequenceNumberTable.count(); ++i)
if(sequenceNumberTable[i] >= 0)
functions += fnTable[sequenceNumberTable[i]]->name;
}
break;
case All:
functions += functionList(Builtin);
functions += functionList(UserDefined);
break;
}
return functions;
}
// Applies the function identified by func, using value as a parameter.
Abakus::number_t evaluateFunction(const Function *func, const Abakus::number_t value)
{
if(func->userDefined) {
// Pull real entry from userFunctionTable
UserFunction *realFunction = func->userFn;
bool wasSet = ValueManager::instance()->isValueSet(realFunction->varName);
Abakus::number_t oldValue;
if(wasSet)
oldValue = ValueManager::instance()->value(realFunction->varName);
ValueManager::instance()->setValue(realFunction->varName, value);
Abakus::number_t result = realFunction->fn->value();
if(wasSet)
ValueManager::instance()->setValue(realFunction->varName, oldValue);
else
ValueManager::instance()->removeValue(realFunction->varName);
return result;
}
return (value.*(func->fn))();
}
void setTrigMode(Abakus::TrigMode mode)
{
Abakus::m_trigMode = mode;
}
Abakus::TrigMode trigMode()
{
return Abakus::m_trigMode;
}
#include "function.moc"