normalizer2.h

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/*
*******************************************************************************
*
*   Copyright (C) 2009-2012, International Business Machines
*   Corporation and others.  All Rights Reserved.
*
*******************************************************************************
*   file name:  normalizer2.h
*   encoding:   US-ASCII
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 2009nov22
*   created by: Markus W. Scherer
*/
 
#ifndef __NORMALIZER2_H__
#define __NORMALIZER2_H__

 
#include "unicode/utypes.h"
 
#if !UCONFIG_NO_NORMALIZATION
 
#include "unicode/uniset.h"
#include "unicode/unistr.h"
#include "unicode/unorm2.h"
 
U_NAMESPACE_BEGIN

class U_COMMON_API Normalizer2 : public UObject {
public:
    ~Normalizer2();
 
#ifndef U_HIDE_DRAFT_API
    static const Normalizer2 *
    getNFCInstance(UErrorCode &errorCode);

    static const Normalizer2 *
    getNFDInstance(UErrorCode &errorCode);

    static const Normalizer2 *
    getNFKCInstance(UErrorCode &errorCode);

    static const Normalizer2 *
    getNFKDInstance(UErrorCode &errorCode);

    static const Normalizer2 *
    getNFKCCasefoldInstance(UErrorCode &errorCode);
#endif  /* U_HIDE_DRAFT_API */

    static const Normalizer2 *
    getInstance(const char *packageName,
                const char *name,
                UNormalization2Mode mode,
                UErrorCode &errorCode);

    UnicodeString
    normalize(const UnicodeString &src, UErrorCode &errorCode) const {
        UnicodeString result;
        normalize(src, result, errorCode);
        return result;
    }

    virtual UnicodeString &
    normalize(const UnicodeString &src,
              UnicodeString &dest,
              UErrorCode &errorCode) const = 0;
    virtual UnicodeString &
    normalizeSecondAndAppend(UnicodeString &first,
                             const UnicodeString &second,
                             UErrorCode &errorCode) const = 0;
    virtual UnicodeString &
    append(UnicodeString &first,
           const UnicodeString &second,
           UErrorCode &errorCode) const = 0;

    virtual UBool
    getDecomposition(UChar32 c, UnicodeString &decomposition) const = 0;

    virtual UBool
    getRawDecomposition(UChar32 c, UnicodeString &decomposition) const;

    virtual UChar32
    composePair(UChar32 a, UChar32 b) const;

    virtual uint8_t
    getCombiningClass(UChar32 c) const;

    virtual UBool
    isNormalized(const UnicodeString &s, UErrorCode &errorCode) const = 0;

    virtual UNormalizationCheckResult
    quickCheck(const UnicodeString &s, UErrorCode &errorCode) const = 0;

    virtual int32_t
    spanQuickCheckYes(const UnicodeString &s, UErrorCode &errorCode) const = 0;

    virtual UBool hasBoundaryBefore(UChar32 c) const = 0;

    virtual UBool hasBoundaryAfter(UChar32 c) const = 0;

    virtual UBool isInert(UChar32 c) const = 0;
 
private:
    // No ICU "poor man's RTTI" for this class nor its subclasses.
    virtual UClassID getDynamicClassID() const;
};

class U_COMMON_API FilteredNormalizer2 : public Normalizer2 {
public:
    FilteredNormalizer2(const Normalizer2 &n2, const UnicodeSet &filterSet) :
            norm2(n2), set(filterSet) {}

    ~FilteredNormalizer2();

    virtual UnicodeString &
    normalize(const UnicodeString &src,
              UnicodeString &dest,
              UErrorCode &errorCode) const;
    virtual UnicodeString &
    normalizeSecondAndAppend(UnicodeString &first,
                             const UnicodeString &second,
                             UErrorCode &errorCode) const;
    virtual UnicodeString &
    append(UnicodeString &first,
           const UnicodeString &second,
           UErrorCode &errorCode) const;

    virtual UBool
    getDecomposition(UChar32 c, UnicodeString &decomposition) const;

    virtual UBool
    getRawDecomposition(UChar32 c, UnicodeString &decomposition) const;

    virtual UChar32
    composePair(UChar32 a, UChar32 b) const;

    virtual uint8_t
    getCombiningClass(UChar32 c) const;

    virtual UBool
    isNormalized(const UnicodeString &s, UErrorCode &errorCode) const;
    virtual UNormalizationCheckResult
    quickCheck(const UnicodeString &s, UErrorCode &errorCode) const;
    virtual int32_t
    spanQuickCheckYes(const UnicodeString &s, UErrorCode &errorCode) const;

    virtual UBool hasBoundaryBefore(UChar32 c) const;

    virtual UBool hasBoundaryAfter(UChar32 c) const;

    virtual UBool isInert(UChar32 c) const;
private:
    UnicodeString &
    normalize(const UnicodeString &src,
              UnicodeString &dest,
              USetSpanCondition spanCondition,
              UErrorCode &errorCode) const;
 
    UnicodeString &
    normalizeSecondAndAppend(UnicodeString &first,
                             const UnicodeString &second,
                             UBool doNormalize,
                             UErrorCode &errorCode) const;
 
    const Normalizer2 &norm2;
    const UnicodeSet &set;
};
 
U_NAMESPACE_END
 
#endif  // !UCONFIG_NO_NORMALIZATION
#endif  // __NORMALIZER2_H__