// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
* Copyright (C) 2014, International Business Machines
* Corporation and others.  All Rights Reserved.
*******************************************************************************
* norm2allmodes.h
*
* created on: 2014sep07
* created by: Markus W. Scherer
*/

#ifndef __NORM2ALLMODES_H__
#define __NORM2ALLMODES_H__

#include "unicode/utypes.h"

#if !UCONFIG_NO_NORMALIZATION

#include "unicode/edits.h"
#include "unicode/normalizer2.h"
#include "unicode/stringoptions.h"
#include "unicode/unistr.h"
#include "cpputils.h"
#include "normalizer2impl.h"

U_NAMESPACE_BEGIN

// Intermediate class:
// Has Normalizer2Impl and does boilerplate argument checking and setup.
class Normalizer2WithImpl : public Normalizer2 {
public:
    Normalizer2WithImpl(const Normalizer2Impl &ni) : impl(ni) {}
    virtual ~Normalizer2WithImpl();

    // normalize
    virtual UnicodeString &
    normalize(const UnicodeString &src,
              UnicodeString &dest,
              UErrorCode &errorCode) const {
        if(U_FAILURE(errorCode)) {
            dest.setToBogus();
            return dest;
        }
        const UChar *sArray=src.getBuffer();
        if(&dest==&src || sArray==NULL) {
            errorCode=U_ILLEGAL_ARGUMENT_ERROR;
            dest.setToBogus();
            return dest;
        }
        dest.remove();
        ReorderingBuffer buffer(impl, dest);
        if(buffer.init(src.length(), errorCode)) {
            normalize(sArray, sArray+src.length(), buffer, errorCode);
        }
        return dest;
    }
    virtual void
    normalize(const UChar *src, const UChar *limit,
              ReorderingBuffer &buffer, UErrorCode &errorCode) const = 0;

    // normalize and append
    virtual UnicodeString &
    normalizeSecondAndAppend(UnicodeString &first,
                             const UnicodeString &second,
                             UErrorCode &errorCode) const {
        return normalizeSecondAndAppend(first, second, true, errorCode);
    }
    virtual UnicodeString &
    append(UnicodeString &first,
           const UnicodeString &second,
           UErrorCode &errorCode) const {
        return normalizeSecondAndAppend(first, second, false, errorCode);
    }
    UnicodeString &
    normalizeSecondAndAppend(UnicodeString &first,
                             const UnicodeString &second,
                             UBool doNormalize,
                             UErrorCode &errorCode) const {
        uprv_checkCanGetBuffer(first, errorCode);
        if(U_FAILURE(errorCode)) {
            return first;
        }
        const UChar *secondArray=second.getBuffer();
        if(&first==&second || secondArray==NULL) {
            errorCode=U_ILLEGAL_ARGUMENT_ERROR;
            return first;
        }
        int32_t firstLength=first.length();
        UnicodeString safeMiddle;
        {
            ReorderingBuffer buffer(impl, first);
            if(buffer.init(firstLength+second.length(), errorCode)) {
                normalizeAndAppend(secondArray, secondArray+second.length(), doNormalize,
                                   safeMiddle, buffer, errorCode);
            }
        }  // The ReorderingBuffer destructor finalizes the first string.
        if(U_FAILURE(errorCode)) {
            // Restore the modified suffix of the first string.
            first.replace(firstLength-safeMiddle.length(), 0x7fffffff, safeMiddle);
        }
        return first;
    }
    virtual void
    normalizeAndAppend(const UChar *src, const UChar *limit, UBool doNormalize,
                       UnicodeString &safeMiddle,
                       ReorderingBuffer &buffer, UErrorCode &errorCode) const = 0;
    virtual UBool
    getDecomposition(UChar32 c, UnicodeString &decomposition) const {
        UChar buffer[4];
        int32_t length;
        const UChar *d=impl.getDecomposition(c, buffer, length);
        if(d==NULL) {
            return false;
        }
        if(d==buffer) {
            decomposition.setTo(buffer, length);  // copy the string (Jamos from Hangul syllable c)
        } else {
            decomposition.setTo(false, d, length);  // read-only alias
        }
        return true;
    }
    virtual UBool
    getRawDecomposition(UChar32 c, UnicodeString &decomposition) const {
        UChar buffer[30];
        int32_t length;
        const UChar *d=impl.getRawDecomposition(c, buffer, length);
        if(d==NULL) {
            return false;
        }
        if(d==buffer) {
            decomposition.setTo(buffer, length);  // copy the string (algorithmic decomposition)
        } else {
            decomposition.setTo(false, d, length);  // read-only alias
        }
        return true;
    }
    virtual UChar32
    composePair(UChar32 a, UChar32 b) const {
        return impl.composePair(a, b);
    }

    virtual uint8_t
    getCombiningClass(UChar32 c) const {
        return impl.getCC(impl.getNorm16(c));
    }

    // quick checks
    virtual UBool
    isNormalized(const UnicodeString &s, UErrorCode &errorCode) const {
        if(U_FAILURE(errorCode)) {
            return false;
        }
        const UChar *sArray=s.getBuffer();
        if(sArray==NULL) {
            errorCode=U_ILLEGAL_ARGUMENT_ERROR;
            return false;
        }
        const UChar *sLimit=sArray+s.length();
        return sLimit==spanQuickCheckYes(sArray, sLimit, errorCode);
    }
    virtual UNormalizationCheckResult
    quickCheck(const UnicodeString &s, UErrorCode &errorCode) const {
        return Normalizer2WithImpl::isNormalized(s, errorCode) ? UNORM_YES : UNORM_NO;
    }
    virtual int32_t
    spanQuickCheckYes(const UnicodeString &s, UErrorCode &errorCode) const {
        if(U_FAILURE(errorCode)) {
            return 0;
        }
        const UChar *sArray=s.getBuffer();
        if(sArray==NULL) {
            errorCode=U_ILLEGAL_ARGUMENT_ERROR;
            return 0;
        }
        return (int32_t)(spanQuickCheckYes(sArray, sArray+s.length(), errorCode)-sArray);
    }
    virtual const UChar *
    spanQuickCheckYes(const UChar *src, const UChar *limit, UErrorCode &errorCode) const = 0;

    virtual UNormalizationCheckResult getQuickCheck(UChar32) const {
        return UNORM_YES;
    }

    const Normalizer2Impl &impl;
};

class DecomposeNormalizer2 : public Normalizer2WithImpl {
public:
    DecomposeNormalizer2(const Normalizer2Impl &ni) : Normalizer2WithImpl(ni) {}
    virtual ~DecomposeNormalizer2();

private:
    virtual void
    normalize(const UChar *src, const UChar *limit,
              ReorderingBuffer &buffer, UErrorCode &errorCode) const {
        impl.decompose(src, limit, &buffer, errorCode);
    }
    using Normalizer2WithImpl::normalize;  // Avoid warning about hiding base class function.
    virtual void
    normalizeAndAppend(const UChar *src, const UChar *limit, UBool doNormalize,
                       UnicodeString &safeMiddle,
                       ReorderingBuffer &buffer, UErrorCode &errorCode) const {
        impl.decomposeAndAppend(src, limit, doNormalize, safeMiddle, buffer, errorCode);
    }
    virtual const UChar *
    spanQuickCheckYes(const UChar *src, const UChar *limit, UErrorCode &errorCode) const {
        return impl.decompose(src, limit, NULL, errorCode);
    }
    using Normalizer2WithImpl::spanQuickCheckYes;  // Avoid warning about hiding base class function.
    virtual UNormalizationCheckResult getQuickCheck(UChar32 c) const {
        return impl.isDecompYes(impl.getNorm16(c)) ? UNORM_YES : UNORM_NO;
    }
    virtual UBool hasBoundaryBefore(UChar32 c) const { return impl.hasDecompBoundaryBefore(c); }
    virtual UBool hasBoundaryAfter(UChar32 c) const { return impl.hasDecompBoundaryAfter(c); }
    virtual UBool isInert(UChar32 c) const { return impl.isDecompInert(c); }
};

class ComposeNormalizer2 : public Normalizer2WithImpl {
public:
    ComposeNormalizer2(const Normalizer2Impl &ni, UBool fcc) :
        Normalizer2WithImpl(ni), onlyContiguous(fcc) {}
    virtual ~ComposeNormalizer2();

private:
    virtual void
    normalize(const UChar *src, const UChar *limit,
              ReorderingBuffer &buffer, UErrorCode &errorCode) const U_OVERRIDE {
        impl.compose(src, limit, onlyContiguous, true, buffer, errorCode);
    }
    using Normalizer2WithImpl::normalize;  // Avoid warning about hiding base class function.

    void
    normalizeUTF8(uint32_t options, StringPiece src, ByteSink &sink,
                  Edits *edits, UErrorCode &errorCode) const U_OVERRIDE {
        if (U_FAILURE(errorCode)) {
            return;
        }
        if (edits != nullptr && (options & U_EDITS_NO_RESET) == 0) {
            edits->reset();
        }
        const uint8_t *s = reinterpret_cast<const uint8_t *>(src.data());
        impl.composeUTF8(options, onlyContiguous, s, s + src.length(),
                         &sink, edits, errorCode);
        sink.Flush();
    }

    virtual void
    normalizeAndAppend(const UChar *src, const UChar *limit, UBool doNormalize,
                       UnicodeString &safeMiddle,
                       ReorderingBuffer &buffer, UErrorCode &errorCode) const U_OVERRIDE {
        impl.composeAndAppend(src, limit, doNormalize, onlyContiguous, safeMiddle, buffer, errorCode);
    }

    virtual UBool
    isNormalized(const UnicodeString &s, UErrorCode &errorCode) const U_OVERRIDE {
        if(U_FAILURE(errorCode)) {
            return false;
        }
        const UChar *sArray=s.getBuffer();
        if(sArray==NULL) {
            errorCode=U_ILLEGAL_ARGUMENT_ERROR;
            return false;
        }
        UnicodeString temp;
        ReorderingBuffer buffer(impl, temp);
        if(!buffer.init(5, errorCode)) {  // small destCapacity for substring normalization
            return false;
        }
        return impl.compose(sArray, sArray+s.length(), onlyContiguous, false, buffer, errorCode);
    }
    virtual UBool
    isNormalizedUTF8(StringPiece sp, UErrorCode &errorCode) const U_OVERRIDE {
        if(U_FAILURE(errorCode)) {
            return false;
        }
        const uint8_t *s = reinterpret_cast<const uint8_t *>(sp.data());
        return impl.composeUTF8(0, onlyContiguous, s, s + sp.length(), nullptr, nullptr, errorCode);
    }
    virtual UNormalizationCheckResult
    quickCheck(const UnicodeString &s, UErrorCode &errorCode) const U_OVERRIDE {
        if(U_FAILURE(errorCode)) {
            return UNORM_MAYBE;
        }
        const UChar *sArray=s.getBuffer();
        if(sArray==NULL) {
            errorCode=U_ILLEGAL_ARGUMENT_ERROR;
            return UNORM_MAYBE;
        }
        UNormalizationCheckResult qcResult=UNORM_YES;
        impl.composeQuickCheck(sArray, sArray+s.length(), onlyContiguous, &qcResult);
        return qcResult;
    }
    virtual const UChar *
    spanQuickCheckYes(const UChar *src, const UChar *limit, UErrorCode &) const U_OVERRIDE {
        return impl.composeQuickCheck(src, limit, onlyContiguous, NULL);
    }
    using Normalizer2WithImpl::spanQuickCheckYes;  // Avoid warning about hiding base class function.
    virtual UNormalizationCheckResult getQuickCheck(UChar32 c) const U_OVERRIDE {
        return impl.getCompQuickCheck(impl.getNorm16(c));
    }
    virtual UBool hasBoundaryBefore(UChar32 c) const U_OVERRIDE {
        return impl.hasCompBoundaryBefore(c);
    }
    virtual UBool hasBoundaryAfter(UChar32 c) const U_OVERRIDE {
        return impl.hasCompBoundaryAfter(c, onlyContiguous);
    }
    virtual UBool isInert(UChar32 c) const U_OVERRIDE {
        return impl.isCompInert(c, onlyContiguous);
    }

    const UBool onlyContiguous;
};

class FCDNormalizer2 : public Normalizer2WithImpl {
public:
    FCDNormalizer2(const Normalizer2Impl &ni) : Normalizer2WithImpl(ni) {}
    virtual ~FCDNormalizer2();

private:
    virtual void
    normalize(const UChar *src, const UChar *limit,
              ReorderingBuffer &buffer, UErrorCode &errorCode) const {
        impl.makeFCD(src, limit, &buffer, errorCode);
    }
    using Normalizer2WithImpl::normalize;  // Avoid warning about hiding base class function.
    virtual void
    normalizeAndAppend(const UChar *src, const UChar *limit, UBool doNormalize,
                       UnicodeString &safeMiddle,
                       ReorderingBuffer &buffer, UErrorCode &errorCode) const {
        impl.makeFCDAndAppend(src, limit, doNormalize, safeMiddle, buffer, errorCode);
    }
    virtual const UChar *
    spanQuickCheckYes(const UChar *src, const UChar *limit, UErrorCode &errorCode) const {
        return impl.makeFCD(src, limit, NULL, errorCode);
    }
    using Normalizer2WithImpl::spanQuickCheckYes;  // Avoid warning about hiding base class function.
    virtual UBool hasBoundaryBefore(UChar32 c) const { return impl.hasFCDBoundaryBefore(c); }
    virtual UBool hasBoundaryAfter(UChar32 c) const { return impl.hasFCDBoundaryAfter(c); }
    virtual UBool isInert(UChar32 c) const { return impl.isFCDInert(c); }
};

struct Norm2AllModes : public UMemory {
    Norm2AllModes(Normalizer2Impl *i)
            : impl(i), comp(*i, false), decomp(*i), fcd(*i), fcc(*i, true) {}
    ~Norm2AllModes();

    static Norm2AllModes *createInstance(Normalizer2Impl *impl, UErrorCode &errorCode);
    static Norm2AllModes *createNFCInstance(UErrorCode &errorCode);
    static Norm2AllModes *createInstance(const char *packageName,
                                         const char *name,
                                         UErrorCode &errorCode);

    static const Norm2AllModes *getNFCInstance(UErrorCode &errorCode);
    static const Norm2AllModes *getNFKCInstance(UErrorCode &errorCode);
    static const Norm2AllModes *getNFKC_CFInstance(UErrorCode &errorCode);

    Normalizer2Impl *impl;
    ComposeNormalizer2 comp;
    DecomposeNormalizer2 decomp;
    FCDNormalizer2 fcd;
    ComposeNormalizer2 fcc;
};

U_NAMESPACE_END

#endif  // !UCONFIG_NO_NORMALIZATION
#endif  // __NORM2ALLMODES_H__