ICU 75.1 75.1

bytestriebuilder.h
Go to the documentation of this file.
1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 *******************************************************************************
5 * Copyright (C) 2010-2016, International Business Machines
6 * Corporation and others. All Rights Reserved.
7 *******************************************************************************
8 * file name: bytestriebuilder.h
9 * encoding: UTF-8
10 * tab size: 8 (not used)
11 * indentation:4
12 *
13 * created on: 2010sep25
14 * created by: Markus W. Scherer
15 */
16
22 #ifndef __BYTESTRIEBUILDER_H__
23 #define __BYTESTRIEBUILDER_H__
24
25 #include "unicode/utypes.h"
26
27 #if U_SHOW_CPLUSPLUS_API
28
29 #include "unicode/bytestrie.h"
30 #include "unicode/stringpiece.h"
31 #include "unicode/stringtriebuilder.h"
32
33 class BytesTrieTest;
34
35 U_NAMESPACE_BEGIN
36
37 class BytesTrieElement;
38 class CharString;
45 class U_COMMON_API BytesTrieBuilder : public StringTrieBuilder {
46 public:
52 BytesTrieBuilder(UErrorCode &errorCode);
53
58 virtual ~BytesTrieBuilder();
59
74 BytesTrieBuilder &add(StringPiece s, int32_t value, UErrorCode &errorCode);
75
94 BytesTrie *build(UStringTrieBuildOption buildOption, UErrorCode &errorCode);
95
119 StringPiece buildStringPiece(UStringTrieBuildOption buildOption, UErrorCode &errorCode);
120
127 BytesTrieBuilder &clear();
128
129 private:
130 friend class ::BytesTrieTest;
131
132 BytesTrieBuilder(const BytesTrieBuilder &other) = delete; // no copy constructor
133 BytesTrieBuilder &operator=(const BytesTrieBuilder &other) = delete; // no assignment operator
134
135 void buildBytes(UStringTrieBuildOption buildOption, UErrorCode &errorCode);
136
137 virtual int32_t getElementStringLength(int32_t i) const override;
138 virtual char16_t getElementUnit(int32_t i, int32_t byteIndex) const override;
139 virtual int32_t getElementValue(int32_t i) const override;
140
141 virtual int32_t getLimitOfLinearMatch(int32_t first, int32_t last, int32_t byteIndex) const override;
142
143 virtual int32_t countElementUnits(int32_t start, int32_t limit, int32_t byteIndex) const override;
144 virtual int32_t skipElementsBySomeUnits(int32_t i, int32_t byteIndex, int32_t count) const override;
145 virtual int32_t indexOfElementWithNextUnit(int32_t i, int32_t byteIndex, char16_t byte) const override;
146
147 virtual UBool matchNodesCanHaveValues() const override { return false; }
148
149 virtual int32_t getMaxBranchLinearSubNodeLength() const override { return BytesTrie::kMaxBranchLinearSubNodeLength; }
150 virtual int32_t getMinLinearMatch() const override { return BytesTrie::kMinLinearMatch; }
151 virtual int32_t getMaxLinearMatchLength() const override { return BytesTrie::kMaxLinearMatchLength; }
152
156 class BTLinearMatchNode : public LinearMatchNode {
157 public:
158 BTLinearMatchNode(const char *units, int32_t len, Node *nextNode);
159 virtual bool operator==(const Node &other) const override;
160 virtual void write(StringTrieBuilder &builder) override;
161 private:
162 const char *s;
163 };
164
165 virtual Node *createLinearMatchNode(int32_t i, int32_t byteIndex, int32_t length,
166 Node *nextNode) const override;
167
168 UBool ensureCapacity(int32_t length);
169 virtual int32_t write(int32_t byte) override;
170 int32_t write(const char *b, int32_t length);
171 virtual int32_t writeElementUnits(int32_t i, int32_t byteIndex, int32_t length) override;
172 virtual int32_t writeValueAndFinal(int32_t i, UBool isFinal) override;
173 virtual int32_t writeValueAndType(UBool hasValue, int32_t value, int32_t node) override;
174 virtual int32_t writeDeltaTo(int32_t jumpTarget) override;
175 static int32_t internalEncodeDelta(int32_t i, char intBytes[]);
176
177 CharString *strings; // Pointer not object so we need not #include internal charstr.h.
178 BytesTrieElement *elements;
179 int32_t elementsCapacity;
180 int32_t elementsLength;
181
182 // Byte serialization of the trie.
183 // Grows from the back: bytesLength measures from the end of the buffer!
184 char *bytes;
185 int32_t bytesCapacity;
186 int32_t bytesLength;
187 };
188
189 U_NAMESPACE_END
190
191 #endif /* U_SHOW_CPLUSPLUS_API */
192
193 #endif // __BYTESTRIEBUILDER_H__
bytestrie.h
C++ API: Trie for mapping byte sequences to integer values.
icu::BytesTrieBuilder
Builder class for BytesTrie.
Definition: bytestriebuilder.h:45
icu::BytesTrieBuilder::buildStringPiece
StringPiece buildStringPiece(UStringTrieBuildOption buildOption, UErrorCode &errorCode)
Builds a BytesTrie for the add()ed data and byte-serializes it.
icu::BytesTrieBuilder::BytesTrieBuilder
BytesTrieBuilder(UErrorCode &errorCode)
Constructs an empty builder.
icu::BytesTrieBuilder::~BytesTrieBuilder
virtual ~BytesTrieBuilder()
Destructor.
icu::BytesTrieBuilder::clear
BytesTrieBuilder & clear()
Removes all (byte sequence, value) pairs.
icu::BytesTrieBuilder::add
BytesTrieBuilder & add(StringPiece s, int32_t value, UErrorCode &errorCode)
Adds a (byte sequence, value) pair.
icu::BytesTrieBuilder::build
BytesTrie * build(UStringTrieBuildOption buildOption, UErrorCode &errorCode)
Builds a BytesTrie for the add()ed data.
icu::BytesTrie
Light-weight, non-const reader class for a BytesTrie.
Definition: bytestrie.h:55
icu::StringPiece
A string-like object that points to a sized piece of memory.
Definition: stringpiece.h:60
icu::operator==
U_EXPORT UBool operator==(const StringPiece &x, const StringPiece &y)
Global operator == for StringPiece.
stringpiece.h
C++ API: StringPiece: Read-only byte string wrapper class.
stringtriebuilder.h
C++ API: Builder API for trie builders.
UStringTrieBuildOption
UStringTrieBuildOption
Build options for BytesTrieBuilder and CharsTrieBuilder.
Definition: stringtriebuilder.h:41
UBool
int8_t UBool
The ICU boolean type, a signed-byte integer.
Definition: umachine.h:247
utypes.h
Basic definitions for ICU, for both C and C++ APIs.
UErrorCode
UErrorCode
Standard ICU4C error code type, a substitute for exceptions.
Definition: utypes.h:415
U_COMMON_API
#define U_COMMON_API
Set to export library symbols from inside the common library, and to import them from outside.
Definition: utypes.h:300