194 lines
7.5 KiB
C++
194 lines
7.5 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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*******************************************************************************
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* Copyright (C) 2010-2016, International Business Machines
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* Corporation and others. All Rights Reserved.
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*******************************************************************************
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* file name: ucharstriebuilder.h
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* encoding: UTF-8
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2010nov14
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* created by: Markus W. Scherer
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*/
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#ifndef __UCHARSTRIEBUILDER_H__
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#define __UCHARSTRIEBUILDER_H__
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#include "unicode/utypes.h"
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#if U_SHOW_CPLUSPLUS_API
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#include "unicode/stringtriebuilder.h"
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#include "unicode/ucharstrie.h"
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#include "unicode/unistr.h"
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/**
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* \file
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* \brief C++ API: Builder for icu::UCharsTrie
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*/
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U_NAMESPACE_BEGIN
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class UCharsTrieElement;
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/**
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* Builder class for UCharsTrie.
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*
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* This class is not intended for public subclassing.
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* @stable ICU 4.8
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*/
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class U_COMMON_API UCharsTrieBuilder : public StringTrieBuilder {
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public:
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/**
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* Constructs an empty builder.
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* @param errorCode Standard ICU error code.
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* @stable ICU 4.8
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*/
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UCharsTrieBuilder(UErrorCode &errorCode);
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/**
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* Destructor.
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* @stable ICU 4.8
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*/
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virtual ~UCharsTrieBuilder();
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/**
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* Adds a (string, value) pair.
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* The string must be unique.
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* The string contents will be copied; the builder does not keep
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* a reference to the input UnicodeString or its buffer.
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* @param s The input string.
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* @param value The value associated with this string.
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* @param errorCode Standard ICU error code. Its input value must
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* pass the U_SUCCESS() test, or else the function returns
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* immediately. Check for U_FAILURE() on output or use with
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* function chaining. (See User Guide for details.)
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* @return *this
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* @stable ICU 4.8
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*/
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UCharsTrieBuilder &add(const UnicodeString &s, int32_t value, UErrorCode &errorCode);
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/**
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* Builds a UCharsTrie for the add()ed data.
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* Once built, no further data can be add()ed until clear() is called.
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*
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* A UCharsTrie cannot be empty. At least one (string, value) pair
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* must have been add()ed.
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*
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* This method passes ownership of the builder's internal result array to the new trie object.
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* Another call to any build() variant will re-serialize the trie.
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* After clear() has been called, a new array will be used as well.
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* @param buildOption Build option, see UStringTrieBuildOption.
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* @param errorCode Standard ICU error code. Its input value must
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* pass the U_SUCCESS() test, or else the function returns
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* immediately. Check for U_FAILURE() on output or use with
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* function chaining. (See User Guide for details.)
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* @return A new UCharsTrie for the add()ed data.
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* @stable ICU 4.8
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*/
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UCharsTrie *build(UStringTrieBuildOption buildOption, UErrorCode &errorCode);
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/**
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* Builds a UCharsTrie for the add()ed data and char16_t-serializes it.
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* Once built, no further data can be add()ed until clear() is called.
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*
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* A UCharsTrie cannot be empty. At least one (string, value) pair
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* must have been add()ed.
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*
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* Multiple calls to buildUnicodeString() set the UnicodeStrings to the
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* builder's same char16_t array, without rebuilding.
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* If buildUnicodeString() is called after build(), the trie will be
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* re-serialized into a new array (because build() passes on ownership).
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* If build() is called after buildUnicodeString(), the trie object returned
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* by build() will become the owner of the underlying data for the
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* previously returned UnicodeString.
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* After clear() has been called, a new array will be used as well.
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* @param buildOption Build option, see UStringTrieBuildOption.
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* @param result A UnicodeString which will be set to the char16_t-serialized
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* UCharsTrie for the add()ed data.
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* @param errorCode Standard ICU error code. Its input value must
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* pass the U_SUCCESS() test, or else the function returns
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* immediately. Check for U_FAILURE() on output or use with
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* function chaining. (See User Guide for details.)
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* @return result
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* @stable ICU 4.8
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*/
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UnicodeString &buildUnicodeString(UStringTrieBuildOption buildOption, UnicodeString &result,
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UErrorCode &errorCode);
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/**
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* Removes all (string, value) pairs.
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* New data can then be add()ed and a new trie can be built.
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* @return *this
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* @stable ICU 4.8
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*/
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UCharsTrieBuilder &clear() {
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strings.remove();
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elementsLength=0;
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ucharsLength=0;
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return *this;
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}
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private:
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UCharsTrieBuilder(const UCharsTrieBuilder &other); // no copy constructor
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UCharsTrieBuilder &operator=(const UCharsTrieBuilder &other); // no assignment operator
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void buildUChars(UStringTrieBuildOption buildOption, UErrorCode &errorCode);
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virtual int32_t getElementStringLength(int32_t i) const override;
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virtual char16_t getElementUnit(int32_t i, int32_t unitIndex) const override;
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virtual int32_t getElementValue(int32_t i) const override;
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virtual int32_t getLimitOfLinearMatch(int32_t first, int32_t last, int32_t unitIndex) const override;
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virtual int32_t countElementUnits(int32_t start, int32_t limit, int32_t unitIndex) const override;
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virtual int32_t skipElementsBySomeUnits(int32_t i, int32_t unitIndex, int32_t count) const override;
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virtual int32_t indexOfElementWithNextUnit(int32_t i, int32_t unitIndex, char16_t unit) const override;
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virtual UBool matchNodesCanHaveValues() const override { return true; }
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virtual int32_t getMaxBranchLinearSubNodeLength() const override { return UCharsTrie::kMaxBranchLinearSubNodeLength; }
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virtual int32_t getMinLinearMatch() const override { return UCharsTrie::kMinLinearMatch; }
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virtual int32_t getMaxLinearMatchLength() const override { return UCharsTrie::kMaxLinearMatchLength; }
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class UCTLinearMatchNode : public LinearMatchNode {
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public:
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UCTLinearMatchNode(const char16_t *units, int32_t len, Node *nextNode);
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virtual bool operator==(const Node &other) const override;
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virtual void write(StringTrieBuilder &builder) override;
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private:
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const char16_t *s;
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};
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virtual Node *createLinearMatchNode(int32_t i, int32_t unitIndex, int32_t length,
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Node *nextNode) const override;
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UBool ensureCapacity(int32_t length);
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virtual int32_t write(int32_t unit) override;
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int32_t write(const char16_t *s, int32_t length);
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virtual int32_t writeElementUnits(int32_t i, int32_t unitIndex, int32_t length) override;
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virtual int32_t writeValueAndFinal(int32_t i, UBool isFinal) override;
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virtual int32_t writeValueAndType(UBool hasValue, int32_t value, int32_t node) override;
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virtual int32_t writeDeltaTo(int32_t jumpTarget) override;
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UnicodeString strings;
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UCharsTrieElement *elements;
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int32_t elementsCapacity;
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int32_t elementsLength;
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// char16_t serialization of the trie.
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// Grows from the back: ucharsLength measures from the end of the buffer!
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char16_t *uchars;
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int32_t ucharsCapacity;
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int32_t ucharsLength;
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};
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U_NAMESPACE_END
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#endif /* U_SHOW_CPLUSPLUS_API */
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#endif // __UCHARSTRIEBUILDER_H__
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