source: trunk/src/xmlpatterns/functions/qstringvaluefns_p.h@ 561

/****************************************************************************
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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_StringValueFNs_H
#define Patternist_StringValueFNs_H

#include <QByteArray>

#include "qfunctioncall_p.h"

/**
 * @file
 * @short Contains classes implementing the functions found in
 * <a href="http://www.w3.org/TR/xpath-functions/#string-value-functions">XQuery 1.0 and
 * XPath 2.0 Functions and Operators, 7.4 Functions on AtomicString Values</a>.
 *
 * @ingroup Patternist_functions
 */

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist
{

    /**
     * @short Implements the function <tt>fn:concat()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <[email protected]>
     */
    class ConcatFN : public FunctionCall
    {
    public:
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
    };

    /**
     * @short Implements the function <tt>fn:string-join()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <[email protected]>
     */
    class StringJoinFN : public FunctionCall
    {
    public:
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;

        /**
         * Optimization: when the cardinality of the sequence of items to join
         * cannot be two or more, we have no effect and therefore rewrite
         * ourselves to our first operand.
         */
        virtual Expression::Ptr compress(const StaticContext::Ptr &context);
    };

    /**
     * @short Implements the function <tt>fn:substring()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <[email protected]>
     */
    class SubstringFN : public FunctionCall
    {
    public:
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
    };

    /**
     * @short Implements the function <tt>fn:string-length()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <[email protected]>
     */
    class StringLengthFN : public FunctionCall
    {
    public:
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
    };

    /**
     * @short Implements the function <tt>fn:normalize-space()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <[email protected]>
     */
    class NormalizeSpaceFN : public FunctionCall
    {
    public:
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
    };

    /**
     * @short Implements the function <tt>fn:normalize-unicode()</tt>.
     *
     * What perhaps can be said significant with the implementation, is that it
     * attempts to determine the normalization form at compile time, in order to
     * reduce string work at runtime.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <[email protected]>
     */
    class NormalizeUnicodeFN : public FunctionCall
    {
    public:
        /**
         * Initializes private data.
         */
        NormalizeUnicodeFN();
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
        virtual Expression::Ptr compress(const StaticContext::Ptr &context);

    private:
        int determineNormalizationForm(const DynamicContext::Ptr &context) const;
        QString::NormalizationForm m_normForm;
    };

    /**
     * @short Implements the function <tt>fn:upper-case()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <[email protected]>
     */
    class UpperCaseFN : public FunctionCall
    {
    public:
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
    };

    /**
     * @short Implements the function <tt>fn:lower-case()</tt>.
     *
     * @short Implements the function <tt>fn:concat()</tt>.
     * @ingroup Patternist_functions
     * @author Frans Englich <[email protected]>
     */
    class LowerCaseFN : public FunctionCall
    {
    public:
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
    };

    /**
     * @short Implements the function <tt>fn:translate()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <[email protected]>
     */
    class TranslateFN : public FunctionCall
    {
    public:
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
    };

    /**
     * @short Provides functionality for encoding strings. Sub-classed by various
     * function implementations.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <[email protected]>
     */
    class EncodeString : public FunctionCall
    {
    public:
        /**
         * Evaluates its first operand. If it is the empty sequence, an empty string
         * is returned. Otherwise, the item's string value is returned percent encoded
         * as specified in this class's constructor.
         */
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;

    protected:
        /**
         * Encodes its operand with QUrl::toPercentEncoding(), with @p includeChars as
         * the characters to encode, and @p excludeChars as the characters to not encode.
         */
        EncodeString(const QByteArray &excludeChars, const QByteArray &includeChars);

    private:
        const QByteArray m_excludeChars;
        const QByteArray m_includeChars;
    };

    /**
     * @short Implements the function <tt>fn:encode-for-uri()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <[email protected]>
     */
    class EncodeForURIFN : public EncodeString
    {
    public:
        /**
         * Performs internal initialization.
         */
        EncodeForURIFN();

    private:
        static const char *const include;
    };

    /**
     * @short Implements the function <tt>fn:iri-to-uri()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <[email protected]>
     */
    class IriToURIFN : public EncodeString
    {
    public:
        /**
         * Performs internal initialization.
         */
        IriToURIFN();

    private:
        static const char *const exclude;
    };

    /**
     * @short Implements the function <tt>fn:escape-html-uri()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <[email protected]>
     */
    class EscapeHtmlURIFN : public EncodeString
    {
    public:
        /**
         * Performs internal initialization.
         */
        EscapeHtmlURIFN();

    private:
        static const char *const include;
        static const char *const exclude;
    };
}

QT_END_NAMESPACE

QT_END_HEADER

#endif