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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

#include <rtl/strbuf.hxx>
#include <rtl/string.hxx>
#include <rtl/ustrbuf.hxx>
#include <rtl/ustring.hxx>

// ---------------------------------------------------------------
// += tests

namespace test1
{
static const char XXX1[] = "xxx";
static const char XXX2[] = "xxx";
void f1(OUString s1, int i, OString o)
{
    OUString s2 = s1;
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s2 += "xxx";
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s2 += "xxx";
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s2 += s1;<--- s2 is assigned
    s2 = s1 + "xxx";<--- s2 is overwritten<--- Variable 's2' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s2 += s1;<--- Variable 's2' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s2 += OUString::number(i);<--- Variable 's2' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s2 += XXX1;<--- Variable 's2' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s2 += OUStringLiteral(XXX1) + XXX2;<--- Variable 's2' is assigned a value that is never used.

    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s2 += OStringToOUString(o, RTL_TEXTENCODING_UTF8);<--- Variable 's2' is assigned a value that is never used.
}
void f2(OString s1, int i, OUString u)
{
    OString s2 = s1;
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s2 += "xxx";
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s2 += "xxx";
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s2 += s1;<--- s2 is assigned
    s2 = s1 + "xxx";<--- s2 is overwritten<--- Variable 's2' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s2 += s1;<--- Variable 's2' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s2 += OString::number(i);<--- Variable 's2' is assigned a value that is never used.

    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s2 += OUStringToOString(u, RTL_TEXTENCODING_ASCII_US);<--- Variable 's2' is assigned a value that is never used.
}
void f3(OUString aStr, int nFirstContent)
{
    OUString aFirstStr = aStr.copy(0, nFirstContent);<--- Variable 'aFirstStr' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    aFirstStr += "...";<--- Variable 'aFirstStr' is assigned a value that is never used.
}
OUString side_effect();
void f4(int i)
{
    OUString s1;
    OUString s2("xxx");
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s2 += "xxx";<--- Variable 's2' is assigned a value that is never used.
    ++i;<--- Assignment of function parameter has no effect outside the function.<--- Variable 'i' is assigned a value that is never used.
    // any other kind of statement breaks the chain (at least for now)
    s2 += "xxx";<--- Variable 's2' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s2 += side_effect();<--- Variable 's2' is assigned a value that is never used.
    s1 += "yyy";<--- Variable 's1' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s1 += "yyy";<--- Variable 's1' is assigned a value that is never used.
}
}

namespace test2
{
void f(OUString s3)
{
    s3 += "xxx";<--- Variable 's3' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s3 += "xxx";<--- Variable 's3' is assigned a value that is never used.
}
void g(OString s3)
{
    s3 += "xxx";<--- Variable 's3' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s3 += "xxx";<--- Variable 's3' is assigned a value that is never used.
}
}

namespace test3
{
struct Bar
{
    OUString m_field;
};
void f(Bar b1, Bar& b2, Bar* b3)<--- Parameter 'b2' can be declared with const
{
    OUString s3 = "xxx";<--- Variable 's3' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s3 += b1.m_field;<--- Variable 's3' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s3 += b2.m_field;<--- Variable 's3' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    s3 += b3->m_field;<--- Variable 's3' is assigned a value that is never used.
}
OUString side_effect();
void f2(OUString s)
{
    OUString sRet = "xxx";<--- Variable 'sRet' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    sRet += side_effect();<--- Variable 'sRet' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    sRet += "xxx";<--- Variable 'sRet' is assigned a value that is never used.
    sRet += side_effect();<--- Variable 'sRet' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    sRet += "xxx";<--- Variable 'sRet' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    sRet += "xxx";<--- Variable 'sRet' is assigned a value that is never used.
    sRet += s;<--- Variable 'sRet' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    sRet += "xxx";<--- Variable 'sRet' is assigned a value that is never used.
}
}

// no warning expected
namespace test4
{
OUString side_effect();
void f()
{
    OUString sRet = "xxx";<--- Variable 'sRet' is assigned a value that is never used.
#if OSL_DEBUG_LEVEL > 0
    sRet += ";";
#endif
    sRet += " ";<--- Variable 'sRet' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    sRet += side_effect();<--- Variable 'sRet' is assigned a value that is never used.
}
}

// no warning expected
namespace test5
{
OUString side_effect();
void f()
{
    OUString sRet = side_effect();<--- Variable 'sRet' is assigned a value that is never used.
    sRet += side_effect();<--- Variable 'sRet' is assigned a value that is never used.
}
}

namespace test6
{
void f(OUString sComma, OUString maExtension, int mnDocumentIconID)
{
    OUString sValue;
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    sValue += sComma + sComma + maExtension + sComma;<--- Variable 'sValue' is assigned a value that is never used.
    // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
    sValue += OUString::number(mnDocumentIconID) + sComma;<--- Variable 'sValue' is assigned a value that is never used.
}
struct Foo
{
    OUString sFormula1;
};
void g(int x, const Foo& aValidation)
{
    OUString sCondition;
    switch (x)
    {
        case 1:
            sCondition += "cell-content-is-in-list(";<--- Variable 'sCondition' is assigned a value that is never used.
            // expected-error@+1 {{simplify by merging with the preceding assignment [loplugin:stringadd]}}
            sCondition += aValidation.sFormula1 + ")";<--- Variable 'sCondition' is assigned a value that is never used.
    }
}
}

// ---------------------------------------------------------------
// detecting OUString temporary construction in +

namespace test9
{
OUString getByValue();
const OUString& getByRef();
void f1(OUString s, OUString t, int i, const char* pChar)
{
    // no warning expected
    t = t + "xxx";<--- Variable 't' is assigned a value that is never used.
    // expected-error@+1 {{avoid constructing 'rtl::OUString' from 'const char [4]' on RHS of + (where LHS is of type 'rtl::OUString') [loplugin:stringadd]}}
    s = s + OUString("xxx");
    // expected-error@+1 {{avoid constructing 'rtl::OUString' from 'const rtl::OUString' on RHS of + (where LHS is of type 'rtl::OUString') [loplugin:stringadd]}}
    s = s + OUString(getByRef());<--- Variable 's' is assigned a value that is never used.

    // no warning expected
    OUString a;
    a = a + getByValue();<--- Variable 'a' is assigned a value that is never used.

    // no warning expected
    OUString b;
    b = b + (i == 1 ? "aaa" : "bbb");<--- Variable 'b' is assigned a value that is never used.

    // no warning expected
    OUString c;
    c = c + OUString(pChar, strlen(pChar), RTL_TEXTENCODING_UTF8);<--- Variable 'c' is assigned a value that is never used.
}
void f2(char ch)
{
    OString s;
    // expected-error@+1 {{avoid constructing 'rtl::OString' from 'const char [4]' on RHS of + (where LHS is of type 'rtl::OString') [loplugin:stringadd]}}
    s = s + OString("xxx");
    // expected-error@+1 {{avoid constructing 'rtl::OString' from 'char' on RHS of + (where LHS is of type 'rtl::OString') [loplugin:stringadd]}}
    s = s + OString(ch);<--- Variable 's' is assigned a value that is never used.
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */