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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
-*/
-
-/**
- * \file
- * \brief C++ API: Builder for icu::BytesTrie
- */
-
-#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;
-/**
- * Builder class for BytesTrie.
- *
- * This class is not intended for public subclassing.
- * @stable ICU 4.8
- */
-class U_COMMON_API BytesTrieBuilder : public StringTrieBuilder {
-public:
- /**
- * Constructs an empty builder.
- * @param errorCode Standard ICU error code.
- * @stable ICU 4.8
- */
- BytesTrieBuilder(UErrorCode &errorCode);
-
- /**
- * Destructor.
- * @stable ICU 4.8
- */
- virtual ~BytesTrieBuilder();
-
- /**
- * Adds a (byte sequence, value) pair.
- * The byte sequence must be unique.
- * The bytes will be copied; the builder does not keep
- * a reference to the input StringPiece or its data().
- * @param s The input byte sequence.
- * @param value The value associated with this byte sequence.
- * @param errorCode Standard ICU error code. Its input value must
- * pass the U_SUCCESS() test, or else the function returns
- * immediately. Check for U_FAILURE() on output or use with
- * function chaining. (See User Guide for details.)
- * @return *this
- * @stable ICU 4.8
- */
- BytesTrieBuilder &add(StringPiece s, int32_t value, UErrorCode &errorCode);
-
- /**
- * Builds a BytesTrie for the add()ed data.
- * Once built, no further data can be add()ed until clear() is called.
- *
- * A BytesTrie cannot be empty. At least one (byte sequence, value) pair
- * must have been add()ed.
- *
- * This method passes ownership of the builder's internal result array to the new trie object.
- * Another call to any build() variant will re-serialize the trie.
- * After clear() has been called, a new array will be used as well.
- * @param buildOption Build option, see UStringTrieBuildOption.
- * @param errorCode Standard ICU error code. Its input value must
- * pass the U_SUCCESS() test, or else the function returns
- * immediately. Check for U_FAILURE() on output or use with
- * function chaining. (See User Guide for details.)
- * @return A new BytesTrie for the add()ed data.
- * @stable ICU 4.8
- */
- BytesTrie *build(UStringTrieBuildOption buildOption, UErrorCode &errorCode);
-
- /**
- * Builds a BytesTrie for the add()ed data and byte-serializes it.
- * Once built, no further data can be add()ed until clear() is called.
- *
- * A BytesTrie cannot be empty. At least one (byte sequence, value) pair
- * must have been add()ed.
- *
- * Multiple calls to buildStringPiece() return StringPieces referring to the
- * builder's same byte array, without rebuilding.
- * If buildStringPiece() is called after build(), the trie will be
- * re-serialized into a new array.
- * If build() is called after buildStringPiece(), the trie object will become
- * the owner of the previously returned array.
- * After clear() has been called, a new array will be used as well.
- * @param buildOption Build option, see UStringTrieBuildOption.
- * @param errorCode Standard ICU error code. Its input value must
- * pass the U_SUCCESS() test, or else the function returns
- * immediately. Check for U_FAILURE() on output or use with
- * function chaining. (See User Guide for details.)
- * @return A StringPiece which refers to the byte-serialized BytesTrie for the add()ed data.
- * @stable ICU 4.8
- */
- StringPiece buildStringPiece(UStringTrieBuildOption buildOption, UErrorCode &errorCode);
-
- /**
- * Removes all (byte sequence, value) pairs.
- * New data can then be add()ed and a new trie can be built.
- * @return *this
- * @stable ICU 4.8
- */
- 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; }
-
- /**
- * @internal (private)
- */
- 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__