/**************************************************************************** ** ** Implementation of validator classes ** ** Created : 970610 ** ** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved. ** ** This file is part of the widgets module of the Qt GUI Toolkit. ** ** This file may be used under the terms of the GNU General ** Public License versions 2.0 or 3.0 as published by the Free ** Software Foundation and appearing in the files LICENSE.GPL2 ** and LICENSE.GPL3 included in the packaging of this file. ** Alternatively you may (at your option) use any later version ** of the GNU General Public License if such license has been ** publicly approved by Trolltech ASA (or its successors, if any) ** and the KDE Free Qt Foundation. ** ** Please review the following information to ensure GNU General ** Public Licensing requirements will be met: ** http://trolltech.com/products/qt/licenses/licensing/opensource/. ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview ** or contact the sales department at sales@trolltech.com. ** ** This file may be used under the terms of the Q Public License as ** defined by Trolltech ASA and appearing in the file LICENSE.QPL ** included in the packaging of this file. Licensees holding valid Qt ** Commercial licenses may use this file in accordance with the Qt ** Commercial License Agreement provided with the Software. ** ** This file is provided "AS IS" with NO WARRANTY OF ANY KIND, ** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted ** herein. ** **********************************************************************/ #include "qvalidator.h" #ifndef QT_NO_VALIDATOR #include #include /*! \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 \c Invalid, \c Intermediate or \c Acceptable depending on whether its argument is valid (for the subclass's definition of valid). These three states require some explanation. An \c Invalid string is \e clearly invalid. \c Intermediate is less obvious: the concept of validity is slippery when the string is incomplete (still being edited). QValidator defines \c Intermediate as the property of a string that is neither clearly invalid nor acceptable as a final result. \c 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 \c Acceptable string is \c Intermediate. Here are some examples: \list \i For a line edit that accepts integers from 0 to 999 inclusive, 42 and 123 are \c Acceptable, the empty string and 1114 are \c Intermediate and asdf is \c Invalid. \i For an editable combobox that accepts URLs, any well-formed URL is \c Acceptable, "http://www.trolltech.com/," is \c Intermediate (it might be a cut and paste operation that accidentally took in a comma at the end), the empty string is \c Intermediate (the user might select and delete all of the text in preparation for entering a new URL), and "http:///./" is \c Invalid. \i For a spin box that accepts lengths, "11cm" and "1in" are \c Acceptable, "11" and the empty string are \c Intermediate and "http://www.trolltech.com" and "hour" are \c 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 \c Invalid string \c Acceptable. QValidator is typically used with QLineEdit, QSpinBox and QComboBox. */ /*! \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 during editing. \value Acceptable the string is acceptable as a final result, i.e. it is valid. */ /*! 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( parent, name ) { } /*! Destroys the validator, freeing any storage and other resources used. */ QValidator::~QValidator() { } /*! \fn QValidator::State QValidator::validate( QString& input, int& pos ) const This pure virtual function returns \c Invalid if \a input is invalid according to this validator's rules, \c 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 \c Acceptable if the input is valid. The function can change \a input and \a pos (the cursor position) if it wants to. */ /*! \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 which ensures that a string contains a valid integer within a specified range. \ingroup misc Example of use: \code QValidator* validator = new QIntValidator( 100, 999, this ); QLineEdit* edit = new QLineEdit( this ); // the edit lineedit will only accept integers between 100 and 999 edit->setValidator( validator ); \endcode Below we present some examples of validators. In practice they would normally be associated with a widget as in the example above. \code QString str; int pos = 0; QIntValidator v( 100, 999, this ); str = "1"; v.validate( str, pos ); // returns Intermediate str = "12"; v.validate( str, pos ); // returns Intermediate str = "123"; v.validate( str, pos ); // returns Acceptable str = "678"; v.validate( str, pos ); // returns Acceptable str = "1234"; v.validate( str, pos ); // returns Invalid str = "-123"; v.validate( str, pos ); // returns Invalid str = "abc"; v.validate( str, pos ); // returns Invalid str = "12cm"; v.validate( str, pos ); // returns Invalid \endcode The minimum and maximum values are set in one call with setRange() or individually with setBottom() and setTop(). \sa QDoubleValidator QRegExpValidator */ /*! Constructs a validator called \a name with parent \a parent, that accepts all integers. */ QIntValidator::QIntValidator( QObject * parent, const char *name ) : QValidator( parent, name ) { b = INT_MIN; t = INT_MAX; } /*! Constructs a validator called \a name with parent \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, name ) { b = minimum; t = maximum; } /*! Destroys the validator, freeing any resources allocated. */ QIntValidator::~QIntValidator() { // nothing } /*! Returns \c Acceptable if the \a input is an integer within the valid range, \c Intermediate if the \a input is an integer outside the valid range and \c Invalid if the \a input is not an integer. Note: If the valid range consists of just positive integers (e.g. 32 - 100) and \a input is a negative integer then Invalid is returned. \code int pos = 0; s = "abc"; v.validate( s, pos ); // returns Invalid s = "5"; v.validate( s, pos ); // returns Intermediate s = "50"; v.validate( s, pos ); // returns Valid \endcode */ QValidator::State QIntValidator::validate( QString & input, int & ) const { QString stripped = input.stripWhiteSpace(); if ( stripped.isEmpty() || (b < 0 && stripped == "-") ) return Intermediate; bool ok; long entered = input.toLong( &ok ); if ( !ok || (entered < 0 && b >= 0) ) { return Invalid; } else if ( entered >= b && entered <= t ) { return Acceptable; } else { if ( entered >= 0 ) return ( entered > t ) ? 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 \sa setRange() */ void QIntValidator::setBottom( int bottom ) { setRange( bottom, top() ); } /*! \property QIntValidator::top \brief the validator's highest acceptable value \sa setRange() */ void QIntValidator::setTop( int top ) { setRange( bottom(), top ); } #ifndef QT_NO_REGEXP /*! \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. \sa QIntValidator QRegExpValidator */ /*! Constructs a validator object with parent \a parent, called \a name, which accepts any double. */ QDoubleValidator::QDoubleValidator( QObject * parent, const char *name ) : QValidator( parent, name ) { b = -HUGE_VAL; t = HUGE_VAL; d = 1000; } /*! Constructs a validator object with parent \a parent, 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( parent, name ) { b = bottom; t = top; d = decimals; } /*! Destroys the validator, freeing any resources used. */ QDoubleValidator::~QDoubleValidator() { } /*! Returns \c Acceptable if the string \a input contains a double that is within the valid range and is in the correct format. Returns \c 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 \c Invalid if the \a input is not a double. Note: If the valid range consists of just positive doubles (e.g. 0.0 - 100.0) and \a input is a negative double then Invalid is returned. */ QValidator::State QDoubleValidator::validate( QString & input, int & ) const { QRegExp empty( QString::fromLatin1(" *-?\\.? *") ); if ( b >= 0 && input.stripWhiteSpace().startsWith(QString::fromLatin1("-")) ) return Invalid; if ( empty.exactMatch(input) ) return Intermediate; bool ok = TRUE; double entered = input.toDouble( &ok ); int nume = input.contains( 'e', FALSE ); if ( !ok ) { // explicit exponent regexp QRegExp expexpexp( QString::fromLatin1("[Ee][+-]?\\d*$") ); int eeePos = expexpexp.search( input ); if ( eeePos > 0 && nume == 1 ) { QString mantissa = input.left( eeePos ); entered = mantissa.toDouble( &ok ); if ( !ok ) return Invalid; } else if ( eeePos == 0 ) { return Intermediate; } else { return Invalid; } } int i = input.find( '.' ); if ( i >= 0 && nume == 0 ) { // has decimal point (but no E), now count digits after that i++; int j = i; while( input[j].isDigit() ) j++; if ( j - i > d ) return Intermediate; } if ( entered < b || entered > t ) return Intermediate; else return Acceptable; } /*! 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; d = decimals; } /*! \property QDoubleValidator::bottom \brief the validator's minimum acceptable value \sa setRange() */ void QDoubleValidator::setBottom( double bottom ) { setRange( bottom, top(), decimals() ); } /*! \property QDoubleValidator::top \brief the validator's maximum acceptable value \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 \sa setRange() */ void QDoubleValidator::setDecimals( int decimals ) { setRange( bottom(), top(), decimals ); } /*! \class QRegExpValidator \brief The QRegExpValidator class is used to check a string against a regular expression. \ingroup misc QRegExpValidator contains a regular expression, "regexp", used to determine whether an input string is \c Acceptable, \c Intermediate or \c Invalid. The regexp is treated as if it begins with the start of string assertion, ^, and ends with the end of string assertion $ so the match is against the entire input string, or from the given position if a start position greater than zero is given. For a brief introduction to Qt's regexp engine see \l QRegExp. Example of use: \code // regexp: optional '-' followed by between 1 and 3 digits QRegExp rx( "-?\\d{1,3}" ); QValidator* validator = new QRegExpValidator( rx, this ); QLineEdit* edit = new QLineEdit( this ); edit->setValidator( validator ); \endcode Below we present some examples of validators. In practice they would normally be associated with a widget as in the example above. \code // integers 1 to 9999 QRegExp rx( "[1-9]\\d{0,3}" ); // the validator treats the regexp as "^[1-9]\\d{0,3}$" QRegExpValidator v( rx, 0 ); QString s; int pos = 0; s = "0"; v.validate( s, pos ); // returns Invalid s = "12345"; v.validate( s, pos ); // returns Invalid s = "1"; v.validate( s, pos ); // returns Acceptable rx.setPattern( "\\S+" ); // one or more non-whitespace characters v.setRegExp( rx ); s = "myfile.txt"; v.validate( s, pos ); // Returns Acceptable s = "my file.txt"; v.validate( s, pos ); // Returns Invalid // A, B or C followed by exactly five digits followed by W, X, Y or Z rx.setPattern( "[A-C]\\d{5}[W-Z]" ); v.setRegExp( rx ); s = "a12345Z"; v.validate( s, pos ); // Returns Invalid s = "A12345Z"; v.validate( s, pos ); // Returns Acceptable s = "B12"; v.validate( s, pos ); // Returns Intermediate // match most 'readme' files rx.setPattern( "read\\S?me(\.(txt|asc|1st))?" ); rx.setCaseSensitive( FALSE ); v.setRegExp( rx ); s = "readme"; v.validate( s, pos ); // Returns Acceptable s = "README.1ST"; v.validate( s, pos ); // Returns Acceptable s = "read me.txt"; v.validate( s, pos ); // Returns Invalid s = "readm"; v.validate( s, pos ); // Returns Intermediate \endcode \sa QRegExp QIntValidator QDoubleValidator */ /*! Constructs a validator that accepts any string (including an empty one) as valid. The object's parent is \a parent and its name is \a name. */ QRegExpValidator::QRegExpValidator( QObject *parent, const char *name ) : QValidator( parent, name ), r( QString::fromLatin1(".*") ) { } /*! Constructs a validator which accepts all strings that match the regular expression \a rx. The object's parent is \a parent and its name is \a name. The match is made against the entire string, e.g. if the regexp is [A-Fa-f0-9]+ it will be treated as ^[A-Fa-f0-9]+$. */ QRegExpValidator::QRegExpValidator( const QRegExp& rx, QObject *parent, const char *name ) : QValidator( parent, name ), r( rx ) { } /*! Destroys the validator, freeing any resources allocated. */ QRegExpValidator::~QRegExpValidator() { } /*! Returns \c Acceptable if \a input is matched by the regular expression for this validator, \c Intermediate if it has matched partially (i.e. could be a valid match if additional valid characters are added), and \c 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 \\w\\d\\d (that is, word-character, digit, digit) then "A57" is \c Acceptable, "E5" is \c Intermediate and "+9" is \c Invalid. \sa QRegExp::match() QRegExp::search() */ QValidator::State QRegExpValidator::validate( QString& input, int& pos ) const { if ( r.exactMatch(input) ) { return Acceptable; } else { if ( ((QRegExp&) r).matchedLength() == (int) input.length() ) { return Intermediate; } else { pos = input.length(); return Invalid; } } } /*! Sets the regular expression used for validation to \a rx. \sa regExp() */ void QRegExpValidator::setRegExp( const QRegExp& rx ) { r = rx; } /*! \fn const QRegExp& QRegExpValidator::regExp() const Returns the regular expression used for validation. \sa setRegExp() */ #endif #endif