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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 | |
| */ | |
| class BytesTrieTest; | |
| 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 (because build() passes on ownership). | |
| * If build() is called after buildStringPiece(), the trie object returned | |
| * by build() will become the owner of the underlying string for the | |
| * previously returned StringPiece. | |
| * 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: | |
| friend class ::BytesTrieTest; | |
| BytesTrieBuilder(const BytesTrieBuilder &other) = delete; // no copy constructor | |
| BytesTrieBuilder &operator=(const BytesTrieBuilder &other) = delete; // no assignment operator | |
| void buildBytes(UStringTrieBuildOption buildOption, UErrorCode &errorCode); | |
| virtual int32_t getElementStringLength(int32_t i) const override; | |
| virtual char16_t getElementUnit(int32_t i, int32_t byteIndex) const override; | |
| virtual int32_t getElementValue(int32_t i) const override; | |
| virtual int32_t getLimitOfLinearMatch(int32_t first, int32_t last, int32_t byteIndex) const override; | |
| virtual int32_t countElementUnits(int32_t start, int32_t limit, int32_t byteIndex) const override; | |
| virtual int32_t skipElementsBySomeUnits(int32_t i, int32_t byteIndex, int32_t count) const override; | |
| virtual int32_t indexOfElementWithNextUnit(int32_t i, int32_t byteIndex, char16_t byte) const override; | |
| virtual UBool matchNodesCanHaveValues() const override { return false; } | |
| virtual int32_t getMaxBranchLinearSubNodeLength() const override { return BytesTrie::kMaxBranchLinearSubNodeLength; } | |
| virtual int32_t getMinLinearMatch() const override { return BytesTrie::kMinLinearMatch; } | |
| virtual int32_t getMaxLinearMatchLength() const override { return BytesTrie::kMaxLinearMatchLength; } | |
| /** | |
| * @internal (private) | |
| */ | |
| class BTLinearMatchNode : public LinearMatchNode { | |
| public: | |
| BTLinearMatchNode(const char *units, int32_t len, Node *nextNode); | |
| virtual bool operator==(const Node &other) const override; | |
| virtual void write(StringTrieBuilder &builder) override; | |
| private: | |
| const char *s; | |
| }; | |
| virtual Node *createLinearMatchNode(int32_t i, int32_t byteIndex, int32_t length, | |
| Node *nextNode) const override; | |
| UBool ensureCapacity(int32_t length); | |
| virtual int32_t write(int32_t byte) override; | |
| int32_t write(const char *b, int32_t length); | |
| virtual int32_t writeElementUnits(int32_t i, int32_t byteIndex, int32_t length) override; | |
| virtual int32_t writeValueAndFinal(int32_t i, UBool isFinal) override; | |
| virtual int32_t writeValueAndType(UBool hasValue, int32_t value, int32_t node) override; | |
| virtual int32_t writeDeltaTo(int32_t jumpTarget) override; | |
| static int32_t internalEncodeDelta(int32_t i, char intBytes[]); | |
| 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 | |