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Make mid() and midRef() properly return empty, non-null objects

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If we request a substring starting at the very end of the string,
QString::mid should return an empty string, not a null string.
For instance, QString("abc").mid(3, 0) used to return a null
one, while this patch makes it return an empty one. The
same thing applies to QString::midRef() and QByteArray::mid().

Change-Id: Ie9efd7a0622d429efd0fb682c19856c19e9469af
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>
This commit is contained in:
Giuseppe D'Angelo 2012-01-23 12:02:36 +00:00 committed by Qt by Nokia
parent b39df8bf92
commit 601d685849
5 changed files with 21 additions and 8 deletions
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5
dist/changes-5.0.0 vendored
View File

@ -221,6 +221,11 @@ QtCore
altering the watchlist in both the singular and QStringList overloads of
addPath and removePath.
* QString::mid, QString::midRef and QByteArray::mid, if the position passed
is equal to the length (that is, right after the last character/byte),
now return an empty QString, QStringRef or QByteArray respectively.
in Qt 4 they returned a null QString or a null QStringRef.
QtGui
-----
* Accessibility has been refactored. The hierachy of accessible objects is implemented via

2
src/corelib/tools/qbytearray.cpp
View File

@ -2660,7 +2660,7 @@ QByteArray QByteArray::right(int len) const
QByteArray QByteArray::mid(int pos, int len) const
{
if (d == &shared_null.ba || d == &shared_empty.ba || pos >= d->size)
if (d == &shared_null.ba || d == &shared_empty.ba || pos > d->size)
return QByteArray();
if (len < 0)
len = d->size - pos;

6
src/corelib/tools/qstring.cpp
View File

@ -3385,7 +3385,7 @@ QString QString::right(int n) const
QString QString::mid(int position, int n) const
{
if (d == &shared_null.str || position >= d->size)
if (d == &shared_null.str || position > d->size)
return QString();
if (n < 0)
n = d->size - position;
@ -8024,7 +8024,7 @@ QStringRef QString::rightRef(int n) const
Returns a substring reference to \a n characters of this string,
starting at the specified \a position.
If the \a position exceeds the length of the string, an empty
If the \a position exceeds the length of the string, a null
reference is returned.
If there are less than \a n characters available in the string,
@ -8041,7 +8041,7 @@ QStringRef QString::rightRef(int n) const
QStringRef QString::midRef(int position, int n) const
{
if (d == &shared_null.str || position >= d->size)
if (d == &shared_null.str || position > d->size)
return QStringRef();
if (n < 0)
n = d->size - position;

8
tests/auto/corelib/tools/qstring/tst_qstring.cpp
View File

@ -1417,6 +1417,10 @@ void tst_QString::mid()
QCOMPARE(a.mid(3,3),(QString)"DEF");
QCOMPARE(a.mid(0,0),(QString)"");
QVERIFY(!a.mid(15,0).isNull());
QVERIFY(a.mid(15,0).isEmpty());
QVERIFY(!a.mid(15,1).isNull());
QVERIFY(a.mid(15,1).isEmpty());
QVERIFY(a.mid(9999).isNull());
QVERIFY(a.mid(9999,1).isNull());
@ -1439,6 +1443,10 @@ void tst_QString::midRef()
QCOMPARE(a.midRef(3,3).toString(),(QString)"DEF");
QCOMPARE(a.midRef(0,0).toString(),(QString)"");
QVERIFY(!a.midRef(15,0).toString().isNull());
QVERIFY(a.midRef(15,0).toString().isEmpty());
QVERIFY(!a.midRef(15,1).toString().isNull());
QVERIFY(a.midRef(15,1).toString().isEmpty());
QVERIFY(a.midRef(9999).toString().isEmpty());
QVERIFY(a.midRef(9999,1).toString().isEmpty());

8
tests/auto/other/collections/tst_collections.cpp
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@ -1310,8 +1310,8 @@ void tst_Collections::byteArray()
QVERIFY(hello.mid(0, hello.size()+1) == hello);
QVERIFY(hello.mid(hello.size()-0) == "");
QVERIFY(hello.mid(hello.size()-0).isNull()); // weird but valid 3.x semantics
QVERIFY(hello.mid(hello.size()-0).isEmpty());
QVERIFY(!hello.mid(hello.size()-0).isNull());
QVERIFY(hello.mid(hello.size()-1) == "o");
QVERIFY(hello.mid(hello.size()-2) == "lo");
QVERIFY(hello.mid(hello.size()-200) == "hello");
@ -2030,8 +2030,8 @@ void tst_Collections::qstring()
QVERIFY(hello.mid(0, hello.size()+1) == hello);
QVERIFY(hello.mid(hello.size()-0) == "");
QVERIFY(hello.mid(hello.size()-0).isNull());
QVERIFY(hello.mid(hello.size()-0).isEmpty());
QVERIFY(!hello.mid(hello.size()-0).isNull());
QVERIFY(hello.mid(hello.size()-1) == "o");
QVERIFY(hello.mid(hello.size()-2) == "lo");
QVERIFY(hello.mid(hello.size()-200) == "hello");