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MathValue.cpp
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executable file
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//=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//
// This is a part of the Litestep Shell source code.
//
// Copyright (C) 1997-2015 LiteStep Development Team
//
// 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
//=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
#include "MathValue.h"
#include "../utility/debug.hpp"
#include <cfloat>
#include <cmath>
#include <limits>
#include <sstream>
#include <string.h>
using namespace std;
MathValue::MathValue() :
mType(UNDEFINED)
{
// do nothing
}
MathValue::MathValue(bool value) :
mType(BOOLEAN), mBoolean(value)
{
// do nothing
}
MathValue::MathValue(int value) :
mType(NUMBER), mNumber(value)
{
// do nothing
}
MathValue::MathValue(double value) :
mType(NUMBER), mNumber(value)
{
// do nothing
}
MathValue::MathValue(const wstring& value) :
mType(STRING), mString(value)
{
// do nothing
}
MathValue::MathValue(const wchar_t *value) :
mType(STRING), mString(value)
{
// do nothing
}
MathValue& MathValue::operator=(bool value)
{
mType = BOOLEAN;
mBoolean = value;
return *this;
}
MathValue& MathValue::operator=(int value)
{
mType = NUMBER;
mNumber = value;
return *this;
}
MathValue& MathValue::operator=(double value)
{
mType = NUMBER;
mNumber = value;
return *this;
}
MathValue& MathValue::operator=(const wstring& value)
{
mType = STRING;
mString = value;
return *this;
}
MathValue& MathValue::operator=(const wchar_t *value)
{
mType = STRING;
mString = value;
return *this;
}
wstring MathValue::GetTypeName() const
{
switch (mType)
{
case UNDEFINED:
return L"undefined";
case BOOLEAN:
return L"boolean";
case NUMBER:
return L"number";
case STRING:
return L"string";
}
// Should never happen
ASSERT(false);
return wstring();
}
bool MathValue::ToBoolean() const
{
switch (mType)
{
case UNDEFINED:
return false;
case BOOLEAN:
return mBoolean;
case NU
10BC0
MBER:
return (mNumber != 0.0 && !_isnan(mNumber));
case STRING:
return (!mString.empty() && _wcsicmp(mString.c_str(), L"false") != 0);
}
// Should never happen
ASSERT(false);
return false;
}
int MathValue::ToInteger() const
{
double number = ToNumber();
return _finite(number) ? static_cast<int>(floor(number)) : 0;
}
double MathValue::ToNumber() const
{
switch (mType)
{
case UNDEFINED:
return numeric_limits<double>::quiet_NaN();
case BOOLEAN:
return (mBoolean ? 1.0 : 0.0);
case NUMBER:
return mNumber;
case STRING:
return MathStringToNumber(mString);
}
// Should never happen
ASSERT(false);
return 0.0;
}
wstring MathValue::ToString() const
{
switch (mType)
{
case UNDEFINED:
return L"undefined";
case BOOLEAN:
return mBoolean ? L"true" : L"false";
case NUMBER:
return MathNumberToString(mNumber);
case STRING:
return mString;
}
// Should never happen
ASSERT(false);
return wstring();
}
wstring MathValue::ToCompatibleString() const
{
// To keep compatible with 0.24.x math evaluations, we must
// return an integer formatted string for all number type
// results. Thus, convert number value to an Integer prior
// to returning it as a string.
if (NUMBER == mType)
{
wostringstream stream;
stream << ToInteger();
return stream.str();
}
// All other values, let the default handler deal with the
// conversion process.
return ToString();
}
MathValue operator+(const MathValue& a, const MathValue& b)
{
if (a.IsUndefined() || b.IsUndefined())
{
// Undefined operands always generate an undefined result
return MathValue();
}
return (a.ToNumber() + b.ToNumber());
}
MathValue operator+(const MathValue& a)
{
if (a.IsUndefined())
{
// Undefined operands always generate an undefined result
return MathValue();
}
return a.ToNumber();
}
MathValue operator-(const MathValue& a, const MathValue& b)
{
if (a.IsUndefined() || b.IsUndefined())
{
// Undefined operands always generate an undefined result
return MathValue();
}
return (a.ToNumber() - b.ToNumber());
}
MathValue operator-(const MathValue& a)
{
if (a.IsUndefined())
{
// Undefined operands always generate an undefined result
return MathValue();
}
return -a.ToNumber();
}
MathValue operator*(const MathValue& a, const MathValue& b)
{
if (a.IsUndefined() || b.IsUndefined())
{
// Undefined operands always generate an undefined result
return MathValue();
}
return (a.ToNumber() * b.ToNumber());
}
MathValue operator/(const MathValue& a, const MathValue& b)
{
if (a.IsUndefined() || b.IsUndefined())
{
// Undefined operands always generate an undefined result
return MathValue();
}
return (a.ToNumber() / b.ToNumber());
}
MathValue operator%(const MathValue& a, const MathValue& b)
{
if (a.IsUndefined() || b.IsUndefined())
{
// Undefined operands always generate an undefined result
return MathValue();
}
double divisor = b.ToNumber();
if (divisor == 0.0)
{
// Modulus by zero generates a NaN
return numeric_limits<double>::quiet_NaN();
}
return fmod(a.ToNumber(), divisor);
}
MathValue operator&&(const MathValue& a, const MathValue& b)
{
// For compatibility reasons, convert undefined values to false for
// Boolean operators.
return (a.ToBoolean() && b.ToBoolean());
}
MathValue operator||(const MathValue& a, const MathValue& b)
{
// For compatibility reasons, convert undefined values to false for
// Boolean operators.
return (a.ToBoolean() || b.ToBoolean());
}
MathValue operator!(const MathValue& a)
{
// For compatibility reasons, convert undefined values to false for
// Boolean operators.
return !a.ToBoolean();
}
MathValue operator==(const MathValue& a, const MathValue& b)
{
if (a.IsUndefined() || b.IsUndefined())
{
// Undefined operands always generate an undefined result
return MathValue();
}
else if (a.IsBoolean() || b.IsBoolean())
{
// If either operand is a Boolean, then do a Boolean comparison
return (a.ToBoolean() == b.ToBoolean());
}
else if (a.IsString() && b.IsString())
{
// If both operands are strings then do a string comparison
return (a.ToString() == b.ToString());
}
else
{
// In all other cases do a numeric comparison.
return (a.ToNumber() == b.ToNumber());
}
}
MathValue operator!=(const MathValue& a, const MathValue& b)
{
if (a.IsUndefined() || b.IsUndefined())
{
// Undefined operands always generate an undefined result
return MathValue();
}
else if (a.IsBoolean() || b.IsBoolean())
{
// If either operand is a Boolean, then do a Boolean comparison
return (a.ToBoolean() != b.ToBoolean());
}
else if (a.IsString() && b.IsString())
{
// If both operands are strings then do a string comparison
return (a.ToString() != b.ToString());
}
else
{
// In all other cases do a numeric comparison.
return (a.ToNumber() != b.ToNumber());
}
}
MathValue operator<(const MathValue& a, const MathValue& b)
{
if (a.IsUndefined() || b.IsUndefined())
{
// Undefined operands always generate an undefined result
return MathValue();
}
else if (a.IsString() && b.IsString())
{
// If both operands are strings then do a string comparison
return (a.ToString() < b.ToString());
}
else
{
// In all other cases do a numeric comparison
return (a.ToNumber() < b.ToNumber());
}
}
MathValue operator<=(const MathValue& a, const MathValue& b)
{
if (a.IsUndefined() || b.IsUndefined())
{
// Undefined operands always generate an undefined result
return MathValue();
}
else if (a.IsString() && b.IsString())
{
// If both operands are strings then do a string comparison
return (a.ToString() <= b.ToString());
}
else
{
// In all other cases do a numeric comparison
return (a.ToNumber() <= b.ToNumber());
}
}
MathValue operator>(const MathValue& a, const MathValue& b)
{
if (a.IsUndefined() || b.IsUndefined())
{
// Undefined operands always generate an undefined result
return MathValue();
}
else if (a.IsString() && b.IsString())
{
// If both operands are strings then do a string comparison
return (a.ToString() > b.ToString());
}
else
{
// In all other cases do a numeric comparison
return (a.ToNumber() > b.ToNumber());
}
}
MathValue operator>=(const MathValue& a, const MathValue& b)
{
if (a.IsUndefined() || b.IsUndefined())
{
// Undefined operands always generate an undefined result
return MathValue();
}
else if (a.IsString() && b.IsString())
{
// If both operands are strings then do a string comparison
return (a.ToString() >= b.ToString());
}
else
{
// In all other cases do a numeric comparison
return (a.ToNumber() >= b.ToNumber());
}
}
MathValue MathConcatenate(const MathValue& a, const MathValue& b)
{
if (a.IsUndefined() || b.IsUndefined())
{
// Undefined operands always generate an undefined result
return MathValue();
}
return (a.ToString() + b.ToString());
}
MathValue MathIntDivide(const MathValue& a, const MathValue& b)
{
if (a.IsUndefined() || b.IsUndefined())
{
// Undefined operands always generate an undefined result
return MathValue();
}
int divisor = b.ToInteger();
if (divisor == 0)
{
// Division by zero results in an Infinity of the appropriate sign
return _copysign(numeric_limits<double>::infinity(), a.ToNumber());
}
return (a.ToInteger() / divisor);
}
wstring MathNumberToString(double number)
{
if (_finite(number))
{
// Number
wostringstream stream;
stream.precision(numeric_limits<double>::digits10 + 1);
stream << number;
return stream.str();
}
else if (number == numeric_limits<double>::infinity())
{
// Positive infinity
return L"Infinity";
}
else if (number == -numeric_limits<double>::infinity())
{
// Negative infinity
return L"-Infinity";
}
else
{
// Not a Number (NaN)
return L"NaN";
}
}
double MathStringToNumber(const wstring& str)
{
wistringstream stream(str);
double number;
if (stream >> number)
{
// Number
return number;
}
else if (_wcsicmp(str.c_str(), L"Infinity") == 0)
{
// Positive infinity
return numeric_limits<double>::infinity();
}
else if (_wcsicmp(str.c_str(), L"-Infinity") == 0)
{
// Negative infinity
return -numeric_limits<double>::infinity();
}
else
{
// Not a Number (NaN)
return numeric_limits<double>::quiet_NaN();
}
}