// © 2017 and later: Unicode, Inc. and others.

// License & terms of use: http://www.unicode.org/copyright.html

// bytesinkutil.h

// created: 2017sep14 Markus W. Scherer

#include "unicode/utypes.h"

#include "unicode/bytestream.h"

#include "unicode/edits.h"

#include "cmemory.h"

#include "uassert.h"

U_NAMESPACE_BEGIN

class ByteSink;

class CharString;

class Edits;

class U_COMMON_API ByteSinkUtil {

public:

    ByteSinkUtil() = delete;  // all static

    /** (length) bytes were mapped to valid (s16, s16Length). */

    static UBool appendChange(int32_t length,

                              const char16_t *s16, int32_t s16Length,

                              ByteSink &sink, Edits *edits, UErrorCode &errorCode);

    /** The bytes at [s, limit[ were mapped to valid (s16, s16Length). */

    static UBool appendChange(const uint8_t *s, const uint8_t *limit,

                              const char16_t *s16, int32_t s16Length,

                              ByteSink &sink, Edits *edits, UErrorCode &errorCode);

    /** (length) bytes were mapped/changed to valid code point c. */

    static void appendCodePoint(int32_t length, UChar32 c, ByteSink &sink, Edits *edits = nullptr);

    /** The few bytes at [src, nextSrc[ were mapped/changed to valid code point c. */

    static inline void appendCodePoint(const uint8_t *src, const uint8_t *nextSrc, UChar32 c,

                                       ByteSink &sink, Edits *edits = nullptr) {

        appendCodePoint((int32_t)(nextSrc - src), c, sink, edits);

    }

    /** Append the two-byte character (U+0080..U+07FF). */

    static void appendTwoBytes(UChar32 c, ByteSink &sink);

    static UBool appendUnchanged(const uint8_t *s, int32_t length,

                                 ByteSink &sink, uint32_t options, Edits *edits,

                                 UErrorCode &errorCode) {

        if (U_FAILURE(errorCode)) { return false; }

        if (length > 0) { appendNonEmptyUnchanged(s, length, sink, options, edits); }

        return true;

    }

    static UBool appendUnchanged(const uint8_t *s, const uint8_t *limit,

                                 ByteSink &sink, uint32_t options, Edits *edits,

                                 UErrorCode &errorCode);

private:

    static void appendNonEmptyUnchanged(const uint8_t *s, int32_t length,

                                        ByteSink &sink, uint32_t options, Edits *edits);

};

class U_COMMON_API CharStringByteSink : public ByteSink {

public:

    CharStringByteSink(CharString* dest);

    ~CharStringByteSink() override;

    CharStringByteSink() = delete;

    CharStringByteSink(const CharStringByteSink&) = delete;

    CharStringByteSink& operator=(const CharStringByteSink&) = delete;

    void Append(const char* bytes, int32_t n) override;

    char* GetAppendBuffer(int32_t min_capacity,

                          int32_t desired_capacity_hint,

                          char* scratch,

                          int32_t scratch_capacity,

                          int32_t* result_capacity) override;

private:

    CharString& dest_;

};

U_NAMESPACE_END