Long live Qt 4.5!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtXmlPatterns 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+
+#ifndef Patternist_DerivedString_H
+#define Patternist_DerivedString_H
+
+#include <QRegExp>
+
+#include "private/qxmlutils_p.h"
+#include "qbuiltintypes_p.h"
+#include "qpatternistlocale_p.h"
+#include "qvalidationerror_p.h"
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+namespace QPatternist
+{
+    /**
+     * @short Represents instances of derived @c xs:string types, such as @c
+     * xs:normalizedString.
+     *
+     * Whitespace is a significant part for creating values from the lexical
+     * space. Of course the specification is tricky here. Here's some pointers:
+     *
+     * - From <a href="4.3.6.1 The whiteSpace Schema Component">XML Schema Part 2: Datatypes
+     *   Second Edition, 4.3.6 whiteSpace</a>:
+     *   "For all atomic datatypes other than string (and types
+     *   derived by restriction from it) the value of whiteSpace is
+     *   collapse and cannot be changed by a schema author; for string the
+     *   value of whiteSpace is preserve; for any type derived by
+     *   restriction from string the value of whiteSpace can be any of the
+     *   three legal values."
+     * - From <a href="http://www.w3.org/TR/xmlschema-1/#d0e1654">XML Schema Part 1: Structures
+     *   Second Edition, 3.1.4 White Space Normalization during Validation</a>:
+     *   "[Definition:]  The normalized value of an element or attribute
+     *   information item is an initial value whose white space, if any,
+     *   has been normalized according to the value of the whiteSpace facet of
+     *   the simple type definition used in its validation."
+     *
+     * @author Frans Englich <fenglich@trolltech.com>
+     * @ingroup Patternist_xdm
+     * @todo Documentation is missing
+     */
+    template<TypeOfDerivedString DerivedType>
+    class DerivedString : public AtomicValue
+    {
+    private:
+        static inline ItemType::Ptr itemType()
+        {
+            switch(DerivedType)
+            {
+                case TypeNormalizedString:  return BuiltinTypes::xsNormalizedString;
+                case TypeToken:             return BuiltinTypes::xsToken;
+                case TypeLanguage:          return BuiltinTypes::xsLanguage;
+                case TypeNMTOKEN:           return BuiltinTypes::xsNMTOKEN;
+                case TypeName:              return BuiltinTypes::xsName;
+                case TypeNCName:            return BuiltinTypes::xsNCName;
+                case TypeID:                return BuiltinTypes::xsID;
+                case TypeIDREF:             return BuiltinTypes::xsIDREF;
+                case TypeENTITY:            return BuiltinTypes::xsENTITY;
+                case TypeString:            return BuiltinTypes::xsString;
+            }
+
+            Q_ASSERT_X(false, Q_FUNC_INFO, "This line is not supposed to be reached.");
+            return ItemType::Ptr();
+        }
+
+        const QString m_value;
+
+        inline DerivedString(const QString &value) : m_value(value)
+        {
+        }
+
+        /**
+         * @short This is an incomplete test for whether @p ch conforms to
+         * the XML 1.0 NameChar production.
+         */
+        static inline bool isNameChar(const QChar &ch)
+        {
+            return ch.isLetter()            ||
+                   ch.isDigit()             ||
+                   ch == QLatin1Char('.')   ||
+                   ch == QLatin1Char('-')   ||
+                   ch == QLatin1Char('_')   ||
+                   ch == QLatin1Char(':');
+        }
+
+        /**
+         * @returns @c true if @p input is a valid @c xs:Name.
+         * @see <a href="http://www.w3.org/TR/REC-xml/#NT-Name">Extensible
+         * Markup Language (XML) 1.0 (Fourth Edition), [5] Name</a>
+         */
+        static inline bool isValidName(const QString &input)
+        {
+            if(input.isEmpty())
+                return false;
+
+            const QChar first(input.at(0));
+
+            if(first.isLetter()             ||
+               first == QLatin1Char('_')    ||
+               first == QLatin1Char(':'))
+            {
+                const int len = input.length();
+
+                if(len == 1)
+                    return true;
+
+                /* Since we've checked the first character above, we start at
+                 * position 1. */
+                for(int i = 1; i < len; ++i)
+                {
+                    if(!isNameChar(input.at(i)))
+                        return false;
+                }
+
+                return true;
+            }
+            else
+                return false;
+        }
+
+        /**
+         * @returns @c true if @p input conforms to the XML 1.0 @c Nmtoken product.
+         *
+         * @see <a
+         * href="http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-Nmtoken">Extensible
+         * Markup Language (XML) 1.0 (Second Edition), [7] Nmtoken</a>
+         */
+        static inline bool isValidNMTOKEN(const QString &input)
+        {
+            const int len = input.length();
+
+            if(len == 0)
+                return false;
+
+            for(int i = 0; i < len; ++i)
+            {
+                if(!isNameChar(input.at(i)))
+                    return false;
+            }
+
+            return true;
+        }
+
+        /**
+         * @short Performs attribute value normalization as if @p input was not
+         * from a @c CDATA section.
+         *
+         * Each whitespace character in @p input that's not a space, such as tab
+         * or new line character, is replaced with a space. This algorithm
+         * differs from QString::simplified() in that it doesn't collapse
+         * subsequent whitespace characters to a single one, or remove trailing
+         * and leading space.
+         *
+         * @see <a href="http://www.w3.org/TR/REC-xml/#AVNormalize">Extensible
+         * Markup Language (XML) 1.0 (Second Edition), 3.3.3 [E70]Attribute-Value Normalization</a>
+         */
+        static QString attributeNormalize(const QString &input)
+        {
+            QString retval(input);
+            const int len = retval.length();
+            const QLatin1Char space(' ');
+
+            for(int i = 0; i < len; ++i)
+            {
+                const QChar ati(retval.at(i));
+
+                if(ati.isSpace() && ati != space)
+                    retval[i] = space;
+            }
+
+            return retval;
+        }
+
+        static AtomicValue::Ptr error(const NamePool::Ptr &np, const QString &invalidValue)
+        {
+            return ValidationError::createError(QString::fromLatin1("%1 is not a valid value for "
+                                                                    "type %2.").arg(formatData(invalidValue))
+                                                                               .arg(formatType(np, itemType())));
+        }
+
+    public:
+
+        /**
+         * @note This function doesn't perform any cleanup/normalizaiton of @p
+         * value. @p value must be a canonical value space of the type.
+         *
+         * If you want cleanup to be performed and/or the lexical space
+         * checked, use fromLexical().
+         */
+        static AtomicValue::Ptr fromValue(const QString &value)
+        {
+            return AtomicValue::Ptr(new DerivedString(value));
+        }
+
+        /**
+         * Constructs an instance from the lexical
+         * representation @p lexical.
+         */
+        static AtomicValue::Ptr fromLexical(const NamePool::Ptr &np, const QString &lexical)
+        {
+            switch(DerivedType)
+            {
+                case TypeString:
+                    return AtomicValue::Ptr(new DerivedString(lexical));
+                case TypeNormalizedString:
+                    return AtomicValue::Ptr(new DerivedString(attributeNormalize(lexical)));
+                case TypeToken:
+                    return AtomicValue::Ptr(new DerivedString(lexical.simplified()));
+                case TypeLanguage:
+                {
+                    const QString simplified(lexical.trimmed());
+
+                    const QRegExp validate(QLatin1String("[a-zA-Z]{1,8}(-[a-zA-Z0-9]{1,8})*"));
+                    Q_ASSERT(validate.isValid());
+
+                    if(validate.exactMatch(simplified))
+                        return AtomicValue::Ptr(new DerivedString(lexical.simplified()));
+                    else
+                        return error(np, simplified);
+                }
+                case TypeNMTOKEN:
+                {
+                    const QString trimmed(lexical.trimmed());
+
+                    if(isValidNMTOKEN(trimmed))
+                        return AtomicValue::Ptr(new DerivedString(trimmed));
+                    else
+                        return error(np, trimmed);
+                }
+                case TypeName:
+                {
+                    const QString simplified(lexical.simplified());
+
+                    if(isValidName(simplified))
+                        return AtomicValue::Ptr(new DerivedString(simplified));
+                    else
+                        return error(np, simplified);
+                }
+                case TypeID:
+                /* Fallthrough. */
+                case TypeIDREF:
+                /* Fallthrough. */
+                case TypeENTITY:
+                /* Fallthrough. */
+                case TypeNCName:
+                {
+                    /* We treat xs:ID, xs:ENTITY, xs:IDREF and xs:NCName in the exact same
+                     * way, except for the type annotation.
+                     *
+                     * We use trimmed() instead of simplified() because it's
+                     * faster and whitespace isn't allowed between
+                     * non-whitespace characters anyway, for these types. */
+                    const QString trimmed(lexical.trimmed());
+
+                    if(QXmlUtils::isNCName(trimmed))
+                        return AtomicValue::Ptr(new DerivedString(trimmed));
+                    else
+                        return error(np, trimmed);
+                }
+                default:
+                {
+                    Q_ASSERT_X(false, Q_FUNC_INFO, "This line is not supposed to be reached.");
+                    return AtomicValue::Ptr();
+                }
+            }
+        }
+
+        virtual QString stringValue() const
+        {
+            return m_value;
+        }
+
+        virtual bool evaluateEBV(const QExplicitlySharedDataPointer<DynamicContext> &) const
+        {
+             return m_value.length() > 0;
+        }
+
+        virtual ItemType::Ptr type() const
+        {
+            return itemType();
+        }
+    };
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif