aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/icu/common/rbbirb.cpp
blob: 68ded32e1d0e46bd72334a45b5fe1595c0f16759 (plain) (blame)
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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
//
//  file:  rbbirb.cpp
//
//  Copyright (C) 2002-2011, International Business Machines Corporation and others.
//  All Rights Reserved.
//
//  This file contains the RBBIRuleBuilder class implementation.  This is the main class for
//    building (compiling) break rules into the tables required by the runtime
//    RBBI engine.
//

#include "unicode/utypes.h"

#if !UCONFIG_NO_BREAK_ITERATION

#include "unicode/brkiter.h"
#include "unicode/rbbi.h"
#include "unicode/ubrk.h"
#include "unicode/unistr.h"
#include "unicode/uniset.h"
#include "unicode/uchar.h"
#include "unicode/uchriter.h"
#include "unicode/parsepos.h"
#include "unicode/parseerr.h"

#include "cmemory.h"
#include "cstring.h"
#include "rbbirb.h"
#include "rbbinode.h"
#include "rbbiscan.h"
#include "rbbisetb.h"
#include "rbbitblb.h"
#include "rbbidata.h"
#include "uassert.h"


U_NAMESPACE_BEGIN


//----------------------------------------------------------------------------------------
//
//  Constructor.
//
//----------------------------------------------------------------------------------------
RBBIRuleBuilder::RBBIRuleBuilder(const UnicodeString   &rules,
                                       UParseError     *parseErr,
                                       UErrorCode      &status)
 : fRules(rules), fStrippedRules(rules)
{
    fStatus = &status; // status is checked below
    fParseError = parseErr;
    fDebugEnv   = NULL;
#ifdef RBBI_DEBUG
    fDebugEnv   = getenv("U_RBBIDEBUG");
#endif


    fForwardTree        = NULL;
    fReverseTree        = NULL;
    fSafeFwdTree        = NULL;
    fSafeRevTree        = NULL;
    fDefaultTree        = &fForwardTree;
    fForwardTable       = NULL;
    fRuleStatusVals     = NULL;
    fChainRules         = FALSE;
    fLBCMNoChain        = FALSE;
    fLookAheadHardBreak = FALSE;
    fUSetNodes          = NULL;
    fRuleStatusVals     = NULL;
    fScanner            = NULL;
    fSetBuilder         = NULL;
    if (parseErr) {
        uprv_memset(parseErr, 0, sizeof(UParseError));
    }

    if (U_FAILURE(status)) {
        return;
    }

    fUSetNodes          = new UVector(status); // bcos status gets overwritten here
    fRuleStatusVals     = new UVector(status);
    fScanner            = new RBBIRuleScanner(this);
    fSetBuilder         = new RBBISetBuilder(this);
    if (U_FAILURE(status)) {
        return;
    }
    if(fSetBuilder == 0 || fScanner == 0 || fUSetNodes == 0 || fRuleStatusVals == 0) {
        status = U_MEMORY_ALLOCATION_ERROR;
    }
}



//----------------------------------------------------------------------------------------
//
//  Destructor
//
//----------------------------------------------------------------------------------------
RBBIRuleBuilder::~RBBIRuleBuilder() {

    int        i;
    for (i=0; ; i++) {
        RBBINode *n = (RBBINode *)fUSetNodes->elementAt(i);
        if (n==NULL) {
            break;
        }
        delete n;
    }

    delete fUSetNodes;
    delete fSetBuilder;
    delete fForwardTable;
    delete fForwardTree;
    delete fReverseTree;
    delete fSafeFwdTree;
    delete fSafeRevTree;
    delete fScanner;
    delete fRuleStatusVals;
}





//----------------------------------------------------------------------------------------
//
//   flattenData() -  Collect up the compiled RBBI rule data and put it into
//                    the format for saving in ICU data files,
//                    which is also the format needed by the RBBI runtime engine.
//
//----------------------------------------------------------------------------------------
static int32_t align8(int32_t i) {return (i+7) & 0xfffffff8;}

RBBIDataHeader *RBBIRuleBuilder::flattenData() {
    int32_t    i;

    if (U_FAILURE(*fStatus)) {
        return NULL;
    }

    // Remove whitespace from the rules to make it smaller.
    // The rule parser has already removed comments.
    fStrippedRules = fScanner->stripRules(fStrippedRules);

    // Calculate the size of each section in the data.
    //   Sizes here are padded up to a multiple of 8 for better memory alignment.
    //   Sections sizes actually stored in the header are for the actual data
    //     without the padding.
    //
    int32_t headerSize        = align8(sizeof(RBBIDataHeader));
    int32_t forwardTableSize  = align8(fForwardTable->getTableSize());
    int32_t reverseTableSize  = align8(fForwardTable->getSafeTableSize());
    int32_t trieSize          = align8(fSetBuilder->getTrieSize());
    int32_t statusTableSize   = align8(fRuleStatusVals->size() * sizeof(int32_t));
    int32_t rulesSize         = align8((fStrippedRules.length()+1) * sizeof(UChar));

    int32_t         totalSize = headerSize
                                + forwardTableSize
                                + reverseTableSize
                                + statusTableSize + trieSize + rulesSize;

#ifdef RBBI_DEBUG
    if (fDebugEnv && uprv_strstr(fDebugEnv, "size")) {
        RBBIDebugPrintf("Header Size:        %8d\n", headerSize);
        RBBIDebugPrintf("Forward Table Size: %8d\n", forwardTableSize);
        RBBIDebugPrintf("Reverse Table Size: %8d\n", reverseTableSize);
        RBBIDebugPrintf("Trie Size:          %8d\n", trieSize);
        RBBIDebugPrintf("Status Table Size:  %8d\n", statusTableSize);
        RBBIDebugPrintf("Rules Size:         %8d\n", rulesSize);
        RBBIDebugPrintf("-----------------------------\n");
        RBBIDebugPrintf("Total Size:         %8d\n", totalSize);
    }
#endif

    RBBIDataHeader  *data     = (RBBIDataHeader *)uprv_malloc(totalSize);
    if (data == NULL) {
        *fStatus = U_MEMORY_ALLOCATION_ERROR;
        return NULL;
    }
    uprv_memset(data, 0, totalSize);


    data->fMagic            = 0xb1a0;
    data->fFormatVersion[0] = RBBI_DATA_FORMAT_VERSION[0];
    data->fFormatVersion[1] = RBBI_DATA_FORMAT_VERSION[1];
    data->fFormatVersion[2] = RBBI_DATA_FORMAT_VERSION[2];
    data->fFormatVersion[3] = RBBI_DATA_FORMAT_VERSION[3];
    data->fLength           = totalSize;
    data->fCatCount         = fSetBuilder->getNumCharCategories();

    data->fFTable        = headerSize;
    data->fFTableLen     = forwardTableSize;

    data->fRTable        = data->fFTable  + data->fFTableLen;
    data->fRTableLen     = reverseTableSize;

    data->fTrie          = data->fRTable + data->fRTableLen;
    data->fTrieLen       = fSetBuilder->getTrieSize();
    data->fStatusTable   = data->fTrie    + trieSize;
    data->fStatusTableLen= statusTableSize;
    data->fRuleSource    = data->fStatusTable + statusTableSize;
    data->fRuleSourceLen = fStrippedRules.length() * sizeof(UChar);

    uprv_memset(data->fReserved, 0, sizeof(data->fReserved));

    fForwardTable->exportTable((uint8_t *)data + data->fFTable);
    fForwardTable->exportSafeTable((uint8_t *)data + data->fRTable);
    fSetBuilder->serializeTrie ((uint8_t *)data + data->fTrie);

    int32_t *ruleStatusTable = (int32_t *)((uint8_t *)data + data->fStatusTable);
    for (i=0; i<fRuleStatusVals->size(); i++) {
        ruleStatusTable[i] = fRuleStatusVals->elementAti(i);
    }

    fStrippedRules.extract((UChar *)((uint8_t *)data+data->fRuleSource), rulesSize/2+1, *fStatus);

    return data;
}


//----------------------------------------------------------------------------------------
//
//  createRuleBasedBreakIterator    construct from source rules that are passed in
//                                  in a UnicodeString
//
//----------------------------------------------------------------------------------------
BreakIterator *
RBBIRuleBuilder::createRuleBasedBreakIterator( const UnicodeString    &rules,
                                    UParseError      *parseError,
                                    UErrorCode       &status)
{
    //
    // Read the input rules, generate a parse tree, symbol table,
    // and list of all Unicode Sets referenced by the rules.
    //
    RBBIRuleBuilder  builder(rules, parseError, status);
    if (U_FAILURE(status)) { // status checked here bcos build below doesn't
        return NULL;
    }

    RBBIDataHeader *data = builder.build(status);

    if (U_FAILURE(status)) {
        return nullptr;
    }

    //
    //  Create a break iterator from the compiled rules.
    //     (Identical to creation from stored pre-compiled rules)
    //
    // status is checked after init in construction.
    RuleBasedBreakIterator *This = new RuleBasedBreakIterator(data, status);
    if (U_FAILURE(status)) {
        delete This;
        This = NULL;
    } 
    else if(This == NULL) { // test for NULL
        status = U_MEMORY_ALLOCATION_ERROR;
    }
    return This;
}

RBBIDataHeader *RBBIRuleBuilder::build(UErrorCode &status) {
    if (U_FAILURE(status)) {
        return nullptr;
    }

    fScanner->parse();
    if (U_FAILURE(status)) {
        return nullptr;
    }

    //
    // UnicodeSet processing.
    //    Munge the Unicode Sets to create a set of character categories.
    //    Generate the mapping tables (TRIE) from input code points to
    //    the character categories.
    //
    fSetBuilder->buildRanges();

    //
    //   Generate the DFA state transition table.
    //
    fForwardTable = new RBBITableBuilder(this, &fForwardTree, status);
    if (fForwardTable == nullptr) {
        status = U_MEMORY_ALLOCATION_ERROR;
        return nullptr;
    }

    fForwardTable->buildForwardTable();
    optimizeTables();
    fForwardTable->buildSafeReverseTable(status);


#ifdef RBBI_DEBUG
    if (fDebugEnv && uprv_strstr(fDebugEnv, "states")) {
        fForwardTable->printStates();
        fForwardTable->printRuleStatusTable();
        fForwardTable->printReverseTable();
    }
#endif

    fSetBuilder->buildTrie();

    //
    //   Package up the compiled data into a memory image
    //      in the run-time format.
    //
    RBBIDataHeader *data = flattenData(); // returns NULL if error
    if (U_FAILURE(status)) {
        return nullptr;
    }
    return data;
}

void RBBIRuleBuilder::optimizeTables() {
    bool didSomething;
    do {
        didSomething = false;

        // Begin looking for duplicates with char class 3.
        // Classes 0, 1 and 2 are special; they are unused, {bof} and {eof} respectively,
        // and should not have other categories merged into them.
        IntPair duplPair = {3, 0};
        while (fForwardTable->findDuplCharClassFrom(&duplPair)) {
            fSetBuilder->mergeCategories(duplPair);
            fForwardTable->removeColumn(duplPair.second);
            didSomething = true;
        }

        while (fForwardTable->removeDuplicateStates() > 0) {
            didSomething = true;
        }
    } while (didSomething);
}

U_NAMESPACE_END

#endif /* #if !UCONFIG_NO_BREAK_ITERATION */