1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
* Copyright (C) 2014, International Business Machines
* Corporation and others. All Rights Reserved.
*******************************************************************************
* dictionarydata.h
*
* created on: 2012may31
* created by: Markus W. Scherer & Maxime Serrano
*/
#ifndef __DICTIONARYDATA_H__
#define __DICTIONARYDATA_H__
#include "unicode/utypes.h"
#if !UCONFIG_NO_BREAK_ITERATION
#include "unicode/utext.h"
#include "unicode/udata.h"
#include "udataswp.h"
#include "unicode/uobject.h"
#include "unicode/ustringtrie.h"
U_NAMESPACE_BEGIN
class UCharsTrie;
class BytesTrie;
class U_COMMON_API DictionaryData : public UMemory {
public:
static const int32_t TRIE_TYPE_BYTES; // = 0;
static const int32_t TRIE_TYPE_UCHARS; // = 1;
static const int32_t TRIE_TYPE_MASK; // = 7;
static const int32_t TRIE_HAS_VALUES; // = 8;
static const int32_t TRANSFORM_NONE; // = 0;
static const int32_t TRANSFORM_TYPE_OFFSET; // = 0x1000000;
static const int32_t TRANSFORM_TYPE_MASK; // = 0x7f000000;
static const int32_t TRANSFORM_OFFSET_MASK; // = 0x1fffff;
enum {
// Byte offsets from the start of the data, after the generic header.
IX_STRING_TRIE_OFFSET,
IX_RESERVED1_OFFSET,
IX_RESERVED2_OFFSET,
IX_TOTAL_SIZE,
// Trie type: TRIE_HAS_VALUES | TRIE_TYPE_BYTES etc.
IX_TRIE_TYPE,
// Transform specification: TRANSFORM_TYPE_OFFSET | 0xe00 etc.
IX_TRANSFORM,
IX_RESERVED6,
IX_RESERVED7,
IX_COUNT
};
};
/**
* Wrapper class around generic dictionaries, implementing matches().
* getType() should return a TRIE_TYPE_??? constant from DictionaryData.
*
* All implementations of this interface must be thread-safe if they are to be used inside of the
* dictionary-based break iteration code.
*/
class U_COMMON_API DictionaryMatcher : public UMemory {
public:
DictionaryMatcher() {};
virtual ~DictionaryMatcher();
// this should emulate CompactTrieDictionary::matches()
/* @param text The text in which to look for matching words. Matching begins
* at the current position of the UText.
* @param maxLength The max length of match to consider. Units are the native indexing
* units of the UText.
* @param limit Capacity of output arrays, which is also the maximum number of
* matching words to be found.
* @param lengths output array, filled with the lengths of the matches, in order,
* from shortest to longest. Lengths are in native indexing units
* of the UText. May be NULL.
* @param cpLengths output array, filled with the lengths of the matches, in order,
* from shortest to longest. Lengths are the number of Unicode code points.
* May be NULL.
* @param values Output array, filled with the values associated with the words found.
* May be NULL.
* @param prefix Output parameter, the code point length of the prefix match, even if that
* prefix didn't lead to a complete word. Will always be >= the cpLength
* of the longest complete word matched. May be NULL.
* @return Number of matching words found.
*/
virtual int32_t matches(UText *text, int32_t maxLength, int32_t limit,
int32_t *lengths, int32_t *cpLengths, int32_t *values,
int32_t *prefix) const = 0;
/** @return DictionaryData::TRIE_TYPE_XYZ */
virtual int32_t getType() const = 0;
};
// Implementation of the DictionaryMatcher interface for a UCharsTrie dictionary
class U_COMMON_API UCharsDictionaryMatcher : public DictionaryMatcher {
public:
// constructs a new UCharsDictionaryMatcher.
// The UDataMemory * will be closed on this object's destruction.
UCharsDictionaryMatcher(const UChar *c, UDataMemory *f) : characters(c), file(f) { }
virtual ~UCharsDictionaryMatcher();
virtual int32_t matches(UText *text, int32_t maxLength, int32_t limit,
int32_t *lengths, int32_t *cpLengths, int32_t *values,
int32_t *prefix) const;
virtual int32_t getType() const;
private:
const UChar *characters;
UDataMemory *file;
};
// Implementation of the DictionaryMatcher interface for a BytesTrie dictionary
class U_COMMON_API BytesDictionaryMatcher : public DictionaryMatcher {
public:
// constructs a new BytesTrieDictionaryMatcher
// the transform constant should be the constant read from the file, not a masked version!
// the UDataMemory * fed in here will be closed on this object's destruction
BytesDictionaryMatcher(const char *c, int32_t t, UDataMemory *f)
: characters(c), transformConstant(t), file(f) { }
virtual ~BytesDictionaryMatcher();
virtual int32_t matches(UText *text, int32_t maxLength, int32_t limit,
int32_t *lengths, int32_t *cpLengths, int32_t *values,
int32_t *prefix) const;
virtual int32_t getType() const;
private:
UChar32 transform(UChar32 c) const;
const char *characters;
int32_t transformConstant;
UDataMemory *file;
};
U_NAMESPACE_END
U_CAPI int32_t U_EXPORT2
udict_swap(const UDataSwapper *ds, const void *inData, int32_t length, void *outData, UErrorCode *pErrorCode);
/**
* Format of dictionary .dict data files.
* Format version 1.0.
*
* A dictionary .dict data file contains a byte-serialized BytesTrie or
* a UChars-serialized UCharsTrie.
* Such files are used in dictionary-based break iteration (DBBI).
*
* For a BytesTrie, a transformation type is specified for
* transforming Unicode strings into byte sequences.
*
* A .dict file begins with a standard ICU data file header
* (DataHeader, see ucmndata.h and unicode/udata.h).
* The UDataInfo.dataVersion field is currently unused (set to 0.0.0.0).
*
* After the header, the file contains the following parts.
* Constants are defined in the DictionaryData class.
*
* For the data structure of BytesTrie & UCharsTrie see
* http://site.icu-project.org/design/struct/tries
* and the bytestrie.h and ucharstrie.h header files.
*
* int32_t indexes[indexesLength]; -- indexesLength=indexes[IX_STRING_TRIE_OFFSET]/4;
*
* The first four indexes are byte offsets in ascending order.
* Each byte offset marks the start of the next part in the data file,
* and the end of the previous one.
* When two consecutive byte offsets are the same, then the corresponding part is empty.
* Byte offsets are offsets from after the header,
* that is, from the beginning of the indexes[].
* Each part starts at an offset with proper alignment for its data.
* If necessary, the previous part may include padding bytes to achieve this alignment.
*
* trieType=indexes[IX_TRIE_TYPE] defines the trie type.
* transform=indexes[IX_TRANSFORM] defines the Unicode-to-bytes transformation.
* If the transformation type is TRANSFORM_TYPE_OFFSET,
* then the lower 21 bits contain the offset code point.
* Each code point c is mapped to byte b = (c - offset).
* Code points outside the range offset..(offset+0xff) cannot be mapped
* and do not occur in the dictionary.
*
* stringTrie; -- a serialized BytesTrie or UCharsTrie
*
* The dictionary maps strings to specific values (TRIE_HAS_VALUES bit set in trieType),
* or it maps all strings to 0 (TRIE_HAS_VALUES bit not set).
*/
#endif /* !UCONFIG_NO_BREAK_ITERATION */
#endif /* __DICTIONARYDATA_H__ */
|
