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#include <qdebug.h>
#include "qvalidator.h"
#ifndef QT_NO_VALIDATOR
#include "private/qobject_p.h"
#include "private/qlocale_p.h"
#include <limits.h>
#include <math.h>
QT_BEGIN_NAMESPACE
/*!
\class QValidator
\brief The QValidator class provides validation of input text.
The class itself is abstract. Two subclasses, \l QIntValidator and
\l QDoubleValidator, provide basic numeric-range checking, and \l
QRegExpValidator provides general checking using a custom regular
expression.
If the built-in validators aren't sufficient, you can subclass
QValidator. The class has two virtual functions: validate() and
fixup().
\l validate() must be implemented by every subclass. It returns
\l Invalid, \l Intermediate or \l Acceptable depending on whether
its argument is valid (for the subclass's definition of valid).
These three states require some explanation. An \l Invalid string
is \e clearly invalid. \l Intermediate is less obvious: the
concept of validity is difficult to apply when the string is
incomplete (still being edited). QValidator defines \l Intermediate
as the property of a string that is neither clearly invalid nor
acceptable as a final result. \l Acceptable means that the string
is acceptable as a final result. One might say that any string
that is a plausible intermediate state during entry of an \l
Acceptable string is \l Intermediate.
Here are some examples:
\list
\i For a line edit that accepts integers from 10 to 1000 inclusive,
42 and 123 are \l Acceptable, the empty string and 5 are \l
Intermediate, and "asdf" and 1114 is \l Invalid.
\i For an editable combobox that accepts URLs, any well-formed URL
is \l Acceptable, "http://example.com/," is \l Intermediate
(it might be a cut and paste action that accidentally took in a
comma at the end), the empty string is \l Intermediate (the user
might select and delete all of the text in preparation for entering
a new URL) and "http:///./" is \l Invalid.
\i For a spin box that accepts lengths, "11cm" and "1in" are \l
Acceptable, "11" and the empty string are \l Intermediate, and
"http://example.com" and "hour" are \l Invalid.
\endlist
\l fixup() is provided for validators that can repair some user
errors. The default implementation does nothing. QLineEdit, for
example, will call fixup() if the user presses Enter (or Return)
and the content is not currently valid. This allows the fixup()
function the opportunity of performing some magic to make an \l
Invalid string \l Acceptable.
A validator has a locale, set with setLocale(). It is typically used
to parse localized data. For example, QIntValidator and QDoubleValidator
use it to parse localized representations of integers and doubles.
QValidator is typically used with QLineEdit, QSpinBox and
QComboBox.
\sa QIntValidator, QDoubleValidator, QRegExpValidator, {Line Edits Example}
*/
/*!
\enum QValidator::State
This enum type defines the states in which a validated string can
exist.
\value Invalid The string is \e clearly invalid.
\value Intermediate The string is a plausible intermediate value.
\value Acceptable The string is acceptable as a final result;
i.e. it is valid.
\omitvalue Valid
*/
class QValidatorPrivate : public QObjectPrivate{
Q_DECLARE_PUBLIC(QValidator)
public:
QValidatorPrivate() : QObjectPrivate()
{
}
QLocale locale;
};
/*!
Sets up the validator. The \a parent parameter is
passed on to the QObject constructor.
*/
QValidator::QValidator(QObject * parent)
: QObject(*new QValidatorPrivate, parent)
{
}
#ifdef QT3_SUPPORT
/*!
\obsolete
Sets up the validator. The \a parent and \a name parameters are
passed on to the QObject constructor.
*/
QValidator::QValidator(QObject * parent, const char *name)
: QObject(*new QValidatorPrivate, parent)
{
setObjectName(QString::fromAscii(name));
}
#endif
/*!
Destroys the validator, freeing any storage and other resources
used.
*/
QValidator::~QValidator()
{
}
/*!
Returns the locale for the validator. The locale is by default initialized to the same as QLocale().
\sa setLocale()
\sa QLocale::QLocale()
*/
QLocale QValidator::locale() const
{
Q_D(const QValidator);
return d->locale;
}
/*!
Sets the \a locale that will be used for the validator. Unless
setLocale has been called, the validator will use the default
locale set with QLocale::setDefault(). If a default locale has not
been set, it is the operating system's locale.
\sa locale() QLocale::setDefault()
*/
void QValidator::setLocale(const QLocale &locale)
{
Q_D(QValidator);
d->locale = locale;
}
/*!
\fn QValidator::State QValidator::validate(QString &input, int &pos) const
This virtual function returns \l Invalid if \a input is invalid
according to this validator's rules, \l Intermediate if it
is likely that a little more editing will make the input
acceptable (e.g. the user types "4" into a widget which accepts
integers between 10 and 99), and \l Acceptable if the input is
valid.
The function can change both \a input and \a pos (the cursor position)
if required.
*/
/*!
\fn void QValidator::fixup(QString & input) const
This function attempts to change \a input to be valid according to
this validator's rules. It need not result in a valid string:
callers of this function must re-test afterwards; the default does
nothing.
Reimplementations of this function can change \a input even if
they do not produce a valid string. For example, an ISBN validator
might want to delete every character except digits and "-", even
if the result is still not a valid ISBN; a surname validator might
want to remove whitespace from the start and end of the string,
even if the resulting string is not in the list of accepted
surnames.
*/
void QValidator::fixup(QString &) const
{
}
/*!
\class QIntValidator
\brief The QIntValidator class provides a validator that ensures
a string contains a valid integer within a specified range.
Example of use:
\snippet doc/src/snippets/code/src_gui_widgets_qvalidator.cpp 0
Below we present some examples of validators. In practice they would
normally be associated with a widget as in the example above.
\snippet doc/src/snippets/code/src_gui_widgets_qvalidator.cpp 1
Notice that the value \c 999 returns Intermediate. Values
consisting of a number of digits equal to or less than the max
value are considered intermediate. This is intended because the
digit that prevents a number to be in range is not necessarily the
last digit typed. This also means that an intermediate number can
have leading zeros.
The minimum and maximum values are set in one call with setRange(),
or individually with setBottom() and setTop().
QIntValidator uses its locale() to interpret the number. For example,
in Arabic locales, QIntValidator will accept Arabic digits. In addition,
QIntValidator is always guaranteed to accept a number formatted according
to the "C" locale.
\sa QDoubleValidator, QRegExpValidator, {Line Edits Example}
*/
/*!
Constructs a validator with a \a parent object that
accepts all integers.
*/
QIntValidator::QIntValidator(QObject * parent)
: QValidator(parent)
{
b = INT_MIN;
t = INT_MAX;
}
/*!
Constructs a validator with a \a parent, that accepts integers
from \a minimum to \a maximum inclusive.
*/
QIntValidator::QIntValidator(int minimum, int maximum,
QObject * parent)
: QValidator(parent)
{
b = minimum;
t = maximum;
}
#ifdef QT3_SUPPORT
/*!
\obsolete
Constructs a validator with a \a parent object and a \a name that
accepts all integers.
*/
QIntValidator::QIntValidator(QObject * parent, const char *name)
: QValidator(parent)
{
setObjectName(QString::fromAscii(name));
b = INT_MIN;
t = INT_MAX;
}
/*!
\obsolete
Constructs a validator called \a name with a \a parent, that
accepts integers from \a minimum to \a maximum inclusive.
*/
QIntValidator::QIntValidator(int minimum, int maximum,
QObject * parent, const char* name)
: QValidator(parent)
{
setObjectName(QString::fromAscii(name));
b = minimum;
t = maximum;
}
#endif
/*!
Destroys the validator.
*/
QIntValidator::~QIntValidator()
{
// nothing
}
/*!
\fn QValidator::State QIntValidator::validate(QString &input, int &pos) const
Returns \l Acceptable if the \a input is an integer within the
valid range, \l Intermediate if the \a input is a prefix of an integer in the
valid range, and \l Invalid otherwise.
If the valid range consists of just positive integers (e.g., 32 to 100)
and \a input is a negative integer, then Invalid is returned. (On the other
hand, if the range consists of negative integers (e.g., -100 to -32) and
\a input is a positive integer, then Intermediate is returned, because
the user might be just about to type the minus (especially for right-to-left
languages).
\snippet doc/src/snippets/code/src_gui_widgets_qvalidator.cpp 2
By default, the \a pos parameter is not used by this validator.
*/
static int numDigits(qlonglong n)
{
if (n == 0)
return 1;
return (int)log10(double(n)) + 1;
}
static qlonglong pow10(int exp)
{
qlonglong result = 1;
for (int i = 0; i < exp; ++i)
result *= 10;
return result;
}
QValidator::State QIntValidator::validate(QString & input, int&) const
{
QByteArray buff;
if (!locale().d()->validateChars(input, QLocalePrivate::IntegerMode, &buff)) {
QLocale cl(QLocale::C);
if (!cl.d()->validateChars(input, QLocalePrivate::IntegerMode, &buff))
return Invalid;
}
if (buff.isEmpty())
return Intermediate;
if (b >= 0 && buff.startsWith('-'))
return Invalid;
if (t < 0 && buff.startsWith('+'))
return Invalid;
if (buff.size() == 1 && (buff.at(0) == '+' || buff.at(0) == '-'))
return Intermediate;
bool ok, overflow;
qlonglong entered = QLocalePrivate::bytearrayToLongLong(buff.constData(), 10, &ok, &overflow);
if (overflow || !ok)
return Invalid;
if (entered >= b && entered <= t)
return Acceptable;
if (entered >= 0) {
// the -entered < b condition is necessary to allow people to type
// the minus last (e.g. for right-to-left languages)
return (entered > t && -entered < b) ? Invalid : Intermediate;
} else {
return (entered < b) ? Invalid : Intermediate;
}
}
/*!
Sets the range of the validator to only accept integers between \a
bottom and \a top inclusive.
*/
void QIntValidator::setRange(int bottom, int top)
{
b = bottom;
t = top;
}
/*!
\property QIntValidator::bottom
\brief the validator's lowest acceptable value
By default, this property's value is derived from the lowest signed
integer available (typically -2147483647).
\sa setRange()
*/
void QIntValidator::setBottom(int bottom)
{
setRange(bottom, top());
}
/*!
\property QIntValidator::top
\brief the validator's highest acceptable value
By default, this property's value is derived from the highest signed
integer available (typically 2147483647).
\sa setRange()
*/
void QIntValidator::setTop(int top)
{
setRange(bottom(), top);
}
#ifndef QT_NO_REGEXP
/*!
\internal
*/
QValidator::QValidator(QObjectPrivate &d, QObject *parent)
: QObject(d, parent)
{
}
/*!
\internal
*/
QValidator::QValidator(QValidatorPrivate &d, QObject *parent)
: QObject(d, parent)
{
}
class QDoubleValidatorPrivate : public QValidatorPrivate
{
Q_DECLARE_PUBLIC(QDoubleValidator)
public:
QDoubleValidatorPrivate()
: QValidatorPrivate()
, notation(QDoubleValidator::ScientificNotation)
{
}
QDoubleValidator::Notation notation;
};
/*!
\class QDoubleValidator
\brief The QDoubleValidator class provides range checking of
floating-point numbers.
QDoubleValidator provides an upper bound, a lower bound, and a
limit on the number of digits after the decimal point. It does not
provide a fixup() function.
You can set the acceptable range in one call with setRange(), or
with setBottom() and setTop(). Set the number of decimal places
with setDecimals(). The validate() function returns the validation
state.
QDoubleValidator uses its locale() to interpret the number. For example,
in the German locale, "1,234" will be accepted as the fractional number
1.234. In Arabic locales, QDoubleValidator will accept Arabic digits.
In addition, QDoubleValidator is always guaranteed to accept a number
formatted according to the "C" locale. QDoubleValidator will not accept
numbers with thousand-seperators.
\sa QIntValidator, QRegExpValidator, {Line Edits Example}
*/
/*!
\enum QDoubleValidator::Notation
\since 4.3
This enum defines the allowed notations for entering a double.
\value StandardNotation The string is written as a standard number
(i.e. 0.015).
\value ScientificNotation The string is written in scientific
form. It may have an exponent part(i.e. 1.5E-2).
*/
/*!
Constructs a validator object with a \a parent object
that accepts any double.
*/
QDoubleValidator::QDoubleValidator(QObject * parent)
: QValidator(*new QDoubleValidatorPrivate , parent)
{
b = -HUGE_VAL;
t = HUGE_VAL;
dec = 1000;
}
/*!
Constructs a validator object with a \a parent object. This
validator will accept doubles from \a bottom to \a top inclusive,
with up to \a decimals digits after the decimal point.
*/
QDoubleValidator::QDoubleValidator(double bottom, double top, int decimals,
QObject * parent)
: QValidator(*new QDoubleValidatorPrivate , parent)
{
b = bottom;
t = top;
dec = decimals;
}
#ifdef QT3_SUPPORT
/*!
\obsolete
Constructs a validator object with a \a parent object and a \a name
that accepts any double.
*/
QDoubleValidator::QDoubleValidator(QObject * parent, const char *name)
: QValidator(*new QDoubleValidatorPrivate , parent)
{
setObjectName(QString::fromAscii(name));
b = -HUGE_VAL;
t = HUGE_VAL;
dec = 1000;
}
/*!
\obsolete
Constructs a validator object with a \a parent object, called \a
name. This validator will accept doubles from \a bottom to \a top
inclusive, with up to \a decimals digits after the decimal point.
*/
QDoubleValidator::QDoubleValidator(double bottom, double top, int decimals,
QObject * parent, const char* name)
: QValidator(*new QDoubleValidatorPrivate, parent)
{
setObjectName(QString::fromAscii(name));
b = bottom;
t = top;
dec = decimals;
}
#endif
/*!
Destroys the validator.
*/
QDoubleValidator::~QDoubleValidator()
{
}
/*!
\fn QValidator::State QDoubleValidator::validate(QString &input, int &pos) const
Returns \l Acceptable if the string \a input contains a double
that is within the valid range and is in the correct format.
Returns \l Intermediate if \a input contains a double that is
outside the range or is in the wrong format; e.g. with too many
digits after the decimal point or is empty.
Returns \l Invalid if the \a input is not a double.
Note: If the valid range consists of just positive doubles (e.g. 0.0 to 100.0)
and \a input is a negative double then \l Invalid is returned. If notation()
is set to StandardNotation, and the input contains more digits before the
decimal point than a double in the valid range may have, \l Invalid is returned.
If notation() is ScientificNotation, and the input is not in the valid range,
\l Intermediate is returned. The value may yet become valid by changing the exponent.
By default, the \a pos parameter is not used by this validator.
*/
#ifndef LLONG_MAX
# define LLONG_MAX Q_INT64_C(0x7fffffffffffffff)
#endif
QValidator::State QDoubleValidator::validate(QString & input, int &) const
{
Q_D(const QDoubleValidator);
QLocalePrivate::NumberMode numMode = QLocalePrivate::DoubleStandardMode;
switch (d->notation) {
case StandardNotation:
numMode = QLocalePrivate::DoubleStandardMode;
break;
case ScientificNotation:
numMode = QLocalePrivate::DoubleScientificMode;
break;
}
QByteArray buff;
if (!locale().d()->validateChars(input, numMode, &buff, dec)) {
QLocale cl(QLocale::C);
if (!cl.d()->validateChars(input, numMode, &buff, dec))
return Invalid;
}
if (buff.isEmpty())
return Intermediate;
if (b >= 0 && buff.startsWith('-'))
return Invalid;
if (t < 0 && buff.startsWith('+'))
return Invalid;
bool ok, overflow;
double i = QLocalePrivate::bytearrayToDouble(buff.constData(), &ok, &overflow);
if (overflow)
return Invalid;
if (!ok)
return Intermediate;
if (i >= b && i <= t)
return Acceptable;
if (d->notation == StandardNotation) {
double max = qMax(qAbs(b), qAbs(t));
if (max < LLONG_MAX) {
qlonglong n = pow10(numDigits(qlonglong(max))) - 1;
if (qAbs(i) > n)
return Invalid;
}
}
return Intermediate;
}
/*!
Sets the validator to accept doubles from \a minimum to \a maximum
inclusive, with at most \a decimals digits after the decimal
point.
*/
void QDoubleValidator::setRange(double minimum, double maximum, int decimals)
{
b = minimum;
t = maximum;
dec = decimals;
}
/*!
\property QDoubleValidator::bottom
\brief the validator's minimum acceptable value
By default, this property contains a value of -infinity.
\sa setRange()
*/
void QDoubleValidator::setBottom(double bottom)
{
setRange(bottom, top(), decimals());
}
/*!
\property QDoubleValidator::top
\brief the validator's maximum acceptable value
By default, this property contains a value of infinity.
\sa setRange()
*/
void QDoubleValidator::setTop(double top)
{
setRange(bottom(), top, decimals());
}
/*!
\property QDoubleValidator::decimals
\brief the validator's maximum number of digits after the decimal point
By default, this property contains a value of 1000.
\sa setRange()
*/
void QDoubleValidator::setDecimals(int decimals)
{
setRange(bottom(), top(), decimals);
}
/*!
\property QDoubleValidator::notation
\since 4.3
\brief the notation of how a string can describe a number
By default, this property is set to ScientificNotation.
\sa Notation
*/
void QDoubleValidator::setNotation(Notation newNotation)
{
Q_D(QDoubleValidator);
d->notation = newNotation;
}
QDoubleValidator::Notation QDoubleValidator::notation() const
{
Q_D(const QDoubleValidator);
return d->notation;
}
/*!
\class QRegExpValidator
\brief The QRegExpValidator class is used to check a string
against a regular expression.
QRegExpValidator uses a regular expression (regexp) to
determine whether an input string is \l Acceptable, \l
Intermediate, or \l Invalid. The regexp can either be supplied
when the QRegExpValidator is constructed, or at a later time.
When QRegExpValidator determines whether a string is \l Acceptable
or not, the regexp is treated as if it begins with the start of string
assertion (\bold{^}) and ends with the end of string assertion
(\bold{$}); the match is against the entire input string, or from
the given position if a start position greater than zero is given.
If a string is a prefix of an \l Acceptable string, it is considered
\l Intermediate. For example, "" and "A" are \l Intermediate for the
regexp \bold{[A-Z][0-9]} (whereas "_" would be \l Invalid).
For a brief introduction to Qt's regexp engine, see \l QRegExp.
Example of use:
\snippet doc/src/snippets/code/src_gui_widgets_qvalidator.cpp 3
Below we present some examples of validators. In practice they would
normally be associated with a widget as in the example above.
\snippet doc/src/snippets/code/src_gui_widgets_qvalidator.cpp 4
\sa QRegExp, QIntValidator, QDoubleValidator, {Settings Editor Example}
*/
/*!
Constructs a validator with a \a parent object that accepts
any string (including an empty one) as valid.
*/
QRegExpValidator::QRegExpValidator(QObject *parent)
: QValidator(parent), r(QString::fromLatin1(".*"))
{
}
/*!
Constructs a validator with a \a parent object that
accepts all strings that match the regular expression \a rx.
The match is made against the entire string; e.g. if the regexp is
\bold{[A-Fa-f0-9]+} it will be treated as \bold{^[A-Fa-f0-9]+$}.
*/
QRegExpValidator::QRegExpValidator(const QRegExp& rx, QObject *parent)
: QValidator(parent), r(rx)
{
}
#ifdef QT3_SUPPORT
/*!
\obsolete
Constructs a validator with a \a parent object and \a name that accepts
any string (including an empty one) as valid.
*/
QRegExpValidator::QRegExpValidator(QObject *parent, const char *name)
: QValidator(parent), r(QString::fromLatin1(".*"))
{
setObjectName(QString::fromAscii(name));
}
/*!
\obsolete
Constructs a validator with a \a parent object and a \a name that
accepts all strings that match the regular expression \a rx.
The match is made against the entire string; e.g. if the regexp is
\bold{[A-Fa-f0-9]+} it will be treated as \bold{^[A-Fa-f0-9]+$}.
*/
QRegExpValidator::QRegExpValidator(const QRegExp& rx, QObject *parent,
const char *name)
: QValidator(parent), r(rx)
{
setObjectName(QString::fromAscii(name));
}
#endif
/*!
Destroys the validator.
*/
QRegExpValidator::~QRegExpValidator()
{
}
/*!
Returns \l Acceptable if \a input is matched by the regular
expression for this validator, \l Intermediate if it has matched
partially (i.e. could be a valid match if additional valid
characters are added), and \l Invalid if \a input is not matched.
The \a pos parameter is set to the length of the \a input parameter.
For example, if the regular expression is \bold{\\w\\d\\d}
(word-character, digit, digit) then "A57" is \l Acceptable,
"E5" is \l Intermediate, and "+9" is \l Invalid.
\sa QRegExp::exactMatch()
*/
QValidator::State QRegExpValidator::validate(QString &input, int& pos) const
{
if (r.exactMatch(input)) {
return Acceptable;
} else {
if (const_cast<QRegExp &>(r).matchedLength() == input.size()) {
return Intermediate;
} else {
pos = input.size();
return Invalid;
}
}
}
/*!
\property QRegExpValidator::regExp
\brief the regular expression used for validation
By default, this property contains a regular expression with the pattern \c{.*}
that matches any string.
*/
void QRegExpValidator::setRegExp(const QRegExp& rx)
{
r = rx;
}
#endif
QT_END_NAMESPACE
#endif // QT_NO_VALIDATOR