1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/*
* This file is part of the Shiboken Python Binding Generator project.
*
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
*
* Contact: PySide team <contact@pyside.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "expression.h"
#include <sstream>
Expression::Expression() : m_value(0), m_operation(None), m_operand1(0), m_operand2(0)
{
}
Expression::Expression(int number) : m_value(number), m_operation(None), m_operand1(0), m_operand2(0)
{
}
Expression::Expression(const Expression& other)
{
m_operand1 = other.m_operand1 ? new Expression(*other.m_operand1) : 0;
m_operand2 = other.m_operand2 ? new Expression(*other.m_operand2) : 0;
m_value = other.m_value;
m_operation = other.m_operation;
}
Expression& Expression::operator=(const Expression& other)
{
delete m_operand1;
delete m_operand2;
m_operand1 = other.m_operand1 ? new Expression(*other.m_operand1) : 0;
m_operand2 = other.m_operand2 ? new Expression(*other.m_operand2) : 0;
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;
}
|
