bytestriebuilder.h

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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*   Copyright (C) 2010-2016, International Business Machines
*   Corporation and others.  All Rights Reserved.
*******************************************************************************
*   file name:  bytestriebuilder.h
*   encoding:   UTF-8
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 2010sep25
*   created by: Markus W. Scherer
*/

#ifndef __BYTESTRIEBUILDER_H__
#define __BYTESTRIEBUILDER_H__

#include "unicode/utypes.h"
#include "unicode/bytestrie.h"
#include "unicode/stringpiece.h"
#include "unicode/stringtriebuilder.h"

U_NAMESPACE_BEGIN

class BytesTrieElement;
class CharString;
class U_COMMON_API BytesTrieBuilder : public StringTrieBuilder {
public:
    BytesTrieBuilder(UErrorCode &errorCode);

    virtual ~BytesTrieBuilder();

    BytesTrieBuilder &add(StringPiece s, int32_t value, UErrorCode &errorCode);

    BytesTrie *build(UStringTrieBuildOption buildOption, UErrorCode &errorCode);

    StringPiece buildStringPiece(UStringTrieBuildOption buildOption, UErrorCode &errorCode);

    BytesTrieBuilder &clear();

private:
    BytesTrieBuilder(const BytesTrieBuilder &other);  // no copy constructor
    BytesTrieBuilder &operator=(const BytesTrieBuilder &other);  // no assignment operator

    void buildBytes(UStringTrieBuildOption buildOption, UErrorCode &errorCode);

    virtual int32_t getElementStringLength(int32_t i) const;
    virtual char16_t getElementUnit(int32_t i, int32_t byteIndex) const;
    virtual int32_t getElementValue(int32_t i) const;

    virtual int32_t getLimitOfLinearMatch(int32_t first, int32_t last, int32_t byteIndex) const;

    virtual int32_t countElementUnits(int32_t start, int32_t limit, int32_t byteIndex) const;
    virtual int32_t skipElementsBySomeUnits(int32_t i, int32_t byteIndex, int32_t count) const;
    virtual int32_t indexOfElementWithNextUnit(int32_t i, int32_t byteIndex, char16_t byte) const;

    virtual UBool matchNodesCanHaveValues() const { return FALSE; }

    virtual int32_t getMaxBranchLinearSubNodeLength() const { return BytesTrie::kMaxBranchLinearSubNodeLength; }
    virtual int32_t getMinLinearMatch() const { return BytesTrie::kMinLinearMatch; }
    virtual int32_t getMaxLinearMatchLength() const { return BytesTrie::kMaxLinearMatchLength; }

    class BTLinearMatchNode : public LinearMatchNode {
    public:
        BTLinearMatchNode(const char *units, int32_t len, Node *nextNode);
        virtual UBool operator==(const Node &other) const;
        virtual void write(StringTrieBuilder &builder);
    private:
        const char *s;
    };
    
    virtual Node *createLinearMatchNode(int32_t i, int32_t byteIndex, int32_t length,
                                        Node *nextNode) const;

    UBool ensureCapacity(int32_t length);
    virtual int32_t write(int32_t byte);
    int32_t write(const char *b, int32_t length);
    virtual int32_t writeElementUnits(int32_t i, int32_t byteIndex, int32_t length);
    virtual int32_t writeValueAndFinal(int32_t i, UBool isFinal);
    virtual int32_t writeValueAndType(UBool hasValue, int32_t value, int32_t node);
    virtual int32_t writeDeltaTo(int32_t jumpTarget);

    CharString *strings;  // Pointer not object so we need not #include internal charstr.h.
    BytesTrieElement *elements;
    int32_t elementsCapacity;
    int32_t elementsLength;

    // Byte serialization of the trie.
    // Grows from the back: bytesLength measures from the end of the buffer!
    char *bytes;
    int32_t bytesCapacity;
    int32_t bytesLength;
};

U_NAMESPACE_END

#endif  // __BYTESTRIEBUILDER_H__