/**************************************************************************** ** ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the QtGui module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** No Commercial Usage ** This file contains pre-release code and may not be distributed. ** You may use this file in accordance with the terms and conditions ** contained in the Technology Preview License Agreement accompanying ** this package. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain additional ** rights. These rights are described in the Nokia Qt LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** If you have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** ** ** ** ** ** ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include #include "qvalidator.h" #ifndef QT_NO_VALIDATOR #include "private/qobject_p.h" #include "private/qlocale_p.h" #include #include QT_BEGIN_NAMESPACE /*! \class QValidator \brief The QValidator class provides validation of input text. \ingroup misc \mainclass 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. \ingroup misc 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. \ingroup misc 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. \ingroup misc 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(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