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****************************************************************************/

//

//  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_Decimal_H

#define Patternist_Decimal_H

#include "qschemanumeric_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

/**

 * Defined in QtCore's qlocale.cpp.

 */

extern char *qdtoa(double d, int mode, int ndigits, int *decpt, int *sign, char **rve, char **resultp);

namespace QPatternist

{

    /**

     * @short Implements the value instance of the @c xs:decimal type.

     *

     * @author Frans Englich <frans.englich@nokia.com>

     * @ingroup Patternist_xdm

     * @todo Documentation is missing/incomplete

     */

    class Decimal : public Numeric

    {

    public:

        static Decimal::Ptr fromValue(const xsDecimal num);

        /**

         * Creates a Decimal from the lexical representation of @c xs:decimal stored in

         * @p strNumeric.

         *

         * A possible optimization is to create an Integer if the string ends

         * with ".0". But this is not conformant. For example, the user writes N.0

         * which according to the specification is an xs:decimal, but where the

         * expression is, is an xs:integer is required. That would pass with

         * such an optimization.

         */

        static AtomicValue::Ptr fromLexical(const QString &strNumeric);

        /**

         * Gets the Effective %Boolean Value of this number.

         *

         * @returns @c false if the number is 0 or @c NaN, otherwise @c true.

         */

        bool evaluateEBV(const QExplicitlySharedDataPointer<DynamicContext> &) const;

        virtual QString stringValue() const;

        /**

         * @returns always BuiltinTypes::xsDecimal

         */

        virtual ItemType::Ptr type() const;

        virtual xsDouble toDouble() const;

        virtual xsInteger toInteger() const;

        virtual xsFloat toFloat() const;

        virtual xsDecimal toDecimal() const;

        virtual qulonglong toUnsignedInteger() const;

        virtual Numeric::Ptr round() const;

        virtual Numeric::Ptr roundHalfToEven(const xsInteger scale) const;

        virtual Numeric::Ptr floor() const;

        virtual Numeric::Ptr ceiling() const;

        virtual Numeric::Ptr abs() const;

        /**

         * @returns always @c false, xs:decimal doesn't have

         * not-a-number in its value space.

         */

        virtual bool isNaN() const;

        /**

         * @returns always @c false, xs:decimal doesn't have

         * infinity in its value space.

         */

        virtual bool isInf() const;

        virtual Item toNegated() const;

        /**

         * Converts @p value into a canonical string representation for @c xs:decimal. This

         * function is used internally by various classes. Users probably wants to call

         * stringValue() which in turn calls this function.

         */

        static QString toString(const xsDecimal value);

        virtual bool isSigned() const;

    protected:

        Decimal(const xsDecimal num);

    private:

        const xsDecimal m_value;

    };

}

QT_END_NAMESPACE

QT_END_HEADER

#endif