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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "expression.h"
#include <sstream>
Expression::Expression() : m_value(0), m_operation(None), m_operand1(nullptr), m_operand2(nullptr)
{
}
Expression::Expression(int number) : m_value(number), m_operation(None), m_operand1(nullptr), m_operand2(nullptr)
{
}
Expression::Expression(const Expression& other)
{
m_operand1 = other.m_operand1 ? new Expression(*other.m_operand1) : nullptr;
m_operand2 = other.m_operand2 ? new Expression(*other.m_operand2) : nullptr;
m_value = other.m_value;
m_operation = other.m_operation;
}
Expression& Expression::operator=(const Expression& other)
{
if (&other == this)
return *this;
delete m_operand1;
delete m_operand2;
m_operand1 = other.m_operand1 ? new Expression(*other.m_operand1) : nullptr;
m_operand2 = other.m_operand2 ? new Expression(*other.m_operand2) : nullptr;
m_operation = other.m_operation;
m_value = other.m_value;
return *this;
}
Expression::~Expression()
{
delete m_operand1;
delete m_operand2;
}
Expression Expression::operator+(const Expression& other)
{
Expression expr;
expr.m_operation = Add;
expr.m_operand1 = new Expression(*this);
expr.m_operand2 = new Expression(other);
return expr;
}
Expression Expression::operator-(const Expression& other)
{
Expression expr;
expr.m_operation = Add;
expr.m_operand1 = new Expression(*this);
expr.m_operand2 = new Expression(other);
return expr;
}
Expression Expression::operator<(const Expression& other)
{
Expression expr;
expr.m_operation = LessThan;
expr.m_operand1 = new Expression(*this);
expr.m_operand2 = new Expression(other);
return expr;
}
Expression Expression::operator>(const Expression& other)
{
Expression expr;
expr.m_operation = GreaterThan;
expr.m_operand1 = new Expression(*this);
expr.m_operand2 = new Expression(other);
return expr;
}
std::string Expression::toString() const
{
if (m_operation == None) {
std::ostringstream s;
s << m_value;
return s.str();
}
std::string result;
result += '(';
result += m_operand1->toString();
char op;
switch (m_operation) {
case Add:
op = '+';
break;
case Sub:
op = '-';
break;
case LessThan:
op = '<';
break;
case GreaterThan:
op = '<';
break;
case None: // just to avoid the compiler warning
default:
op = '?';
break;
}
result += op;
result += m_operand2->toString();
result += ')';
return result;
}
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