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Diffstat (limited to 'intl/icu/source/common/unicode/ucharstriebuilder.h')
-rw-r--r-- | intl/icu/source/common/unicode/ucharstriebuilder.h | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/intl/icu/source/common/unicode/ucharstriebuilder.h b/intl/icu/source/common/unicode/ucharstriebuilder.h new file mode 100644 index 000000000..cc9fb77a9 --- /dev/null +++ b/intl/icu/source/common/unicode/ucharstriebuilder.h @@ -0,0 +1,187 @@ +// Copyright (C) 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: ucharstriebuilder.h +* encoding: US-ASCII +* tab size: 8 (not used) +* indentation:4 +* +* created on: 2010nov14 +* created by: Markus W. Scherer +*/ + +#ifndef __UCHARSTRIEBUILDER_H__ +#define __UCHARSTRIEBUILDER_H__ + +#include "unicode/utypes.h" +#include "unicode/stringtriebuilder.h" +#include "unicode/ucharstrie.h" +#include "unicode/unistr.h" + +/** + * \file + * \brief C++ API: Builder for icu::UCharsTrie + */ + +U_NAMESPACE_BEGIN + +class UCharsTrieElement; + +/** + * Builder class for UCharsTrie. + * + * This class is not intended for public subclassing. + * @stable ICU 4.8 + */ +class U_COMMON_API UCharsTrieBuilder : public StringTrieBuilder { +public: + /** + * Constructs an empty builder. + * @param errorCode Standard ICU error code. + * @stable ICU 4.8 + */ + UCharsTrieBuilder(UErrorCode &errorCode); + + /** + * Destructor. + * @stable ICU 4.8 + */ + virtual ~UCharsTrieBuilder(); + + /** + * Adds a (string, value) pair. + * The string must be unique. + * The string contents will be copied; the builder does not keep + * a reference to the input UnicodeString or its buffer. + * @param s The input string. + * @param value The value associated with this string. + * @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 + */ + UCharsTrieBuilder &add(const UnicodeString &s, int32_t value, UErrorCode &errorCode); + + /** + * Builds a UCharsTrie for the add()ed data. + * Once built, no further data can be add()ed until clear() is called. + * + * A UCharsTrie cannot be empty. At least one (string, 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 UCharsTrie for the add()ed data. + * @stable ICU 4.8 + */ + UCharsTrie *build(UStringTrieBuildOption buildOption, UErrorCode &errorCode); + + /** + * Builds a UCharsTrie for the add()ed data and UChar-serializes it. + * Once built, no further data can be add()ed until clear() is called. + * + * A UCharsTrie cannot be empty. At least one (string, value) pair + * must have been add()ed. + * + * Multiple calls to buildUnicodeString() set the UnicodeStrings to the + * builder's same UChar array, without rebuilding. + * If buildUnicodeString() is called after build(), the trie will be + * re-serialized into a new array. + * If build() is called after buildUnicodeString(), 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 result A UnicodeString which will be set to the UChar-serialized + * UCharsTrie for the add()ed data. + * @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 result + * @stable ICU 4.8 + */ + UnicodeString &buildUnicodeString(UStringTrieBuildOption buildOption, UnicodeString &result, + UErrorCode &errorCode); + + /** + * Removes all (string, value) pairs. + * New data can then be add()ed and a new trie can be built. + * @return *this + * @stable ICU 4.8 + */ + UCharsTrieBuilder &clear() { + strings.remove(); + elementsLength=0; + ucharsLength=0; + return *this; + } + +private: + UCharsTrieBuilder(const UCharsTrieBuilder &other); // no copy constructor + UCharsTrieBuilder &operator=(const UCharsTrieBuilder &other); // no assignment operator + + void buildUChars(UStringTrieBuildOption buildOption, UErrorCode &errorCode); + + virtual int32_t getElementStringLength(int32_t i) const; + virtual UChar getElementUnit(int32_t i, int32_t unitIndex) const; + virtual int32_t getElementValue(int32_t i) const; + + virtual int32_t getLimitOfLinearMatch(int32_t first, int32_t last, int32_t unitIndex) const; + + virtual int32_t countElementUnits(int32_t start, int32_t limit, int32_t unitIndex) const; + virtual int32_t skipElementsBySomeUnits(int32_t i, int32_t unitIndex, int32_t count) const; + virtual int32_t indexOfElementWithNextUnit(int32_t i, int32_t unitIndex, UChar unit) const; + + virtual UBool matchNodesCanHaveValues() const { return TRUE; } + + virtual int32_t getMaxBranchLinearSubNodeLength() const { return UCharsTrie::kMaxBranchLinearSubNodeLength; } + virtual int32_t getMinLinearMatch() const { return UCharsTrie::kMinLinearMatch; } + virtual int32_t getMaxLinearMatchLength() const { return UCharsTrie::kMaxLinearMatchLength; } + + class UCTLinearMatchNode : public LinearMatchNode { + public: + UCTLinearMatchNode(const UChar *units, int32_t len, Node *nextNode); + virtual UBool operator==(const Node &other) const; + virtual void write(StringTrieBuilder &builder); + private: + const UChar *s; + }; + + virtual Node *createLinearMatchNode(int32_t i, int32_t unitIndex, int32_t length, + Node *nextNode) const; + + UBool ensureCapacity(int32_t length); + virtual int32_t write(int32_t unit); + int32_t write(const UChar *s, int32_t length); + virtual int32_t writeElementUnits(int32_t i, int32_t unitIndex, 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); + + UnicodeString strings; + UCharsTrieElement *elements; + int32_t elementsCapacity; + int32_t elementsLength; + + // UChar serialization of the trie. + // Grows from the back: ucharsLength measures from the end of the buffer! + UChar *uchars; + int32_t ucharsCapacity; + int32_t ucharsLength; +}; + +U_NAMESPACE_END + +#endif // __UCHARSTRIEBUILDER_H__ |