1 // Copyright (C) 2016 and later: Unicode, Inc. and others. 2 // License & terms of use: http://www.unicode.org/copyright.html 3 // 4 // regexst.h 5 // 6 // Copyright (C) 2004-2015, International Business Machines Corporation and others. 7 // All Rights Reserved. 8 // 9 // This file contains class RegexStaticSets 10 // 11 // This class is internal to the regular expression implementation. 12 // For the public Regular Expression API, see the file "unicode/regex.h" 13 // 14 // RegexStaticSets groups together the common UnicodeSets that are needed 15 // for compiling or executing RegularExpressions. This grouping simplifies 16 // the thread safe lazy creation and sharing of these sets across 17 // all instances of regular expressions. 18 // 19 #include "unicode/utypes.h" 20 21 #if !UCONFIG_NO_REGULAR_EXPRESSIONS 22 23 #include "unicode/unistr.h" 24 #include "unicode/uniset.h" 25 #include "unicode/uchar.h" 26 #include "unicode/regex.h" 27 #include "uprops.h" 28 #include "cmemory.h" 29 #include "cstring.h" 30 #include "uassert.h" 31 #include "ucln_in.h" 32 #include "umutex.h" 33 34 #include "regexcst.h" // Contains state table for the regex pattern parser. 35 // generated by a Perl script. 36 #include "regexst.h" 37 38 39 40 U_NAMESPACE_BEGIN 41 42 43 //------------------------------------------------------------------------------ 44 // 45 // Unicode Set pattern strings for all of the required constant sets. 46 // Initialized with hex values for portability to EBCDIC based machines. 47 // Really ugly, but there's no good way to avoid it. 48 // 49 //------------------------------------------------------------------------------ 50 51 // "Rule Char" Characters are those with no special meaning, and therefore do not 52 // need to be escaped to appear as literals in a regexp. Expressed 53 // as the inverse of those needing escaping -- [^\*\?\+\[\(\)\{\}\^\$\|\\\.] 54 static const UChar gRuleSet_rule_char_pattern[] = { 55 // [ ^ \ * \ ? \ + \ [ \ ( / ) 56 0x5b, 0x5e, 0x5c, 0x2a, 0x5c, 0x3f, 0x5c, 0x2b, 0x5c, 0x5b, 0x5c, 0x28, 0x5c, 0x29, 57 // \ { \ } \ ^ \ $ \ | \ \ \ . ] 58 0x5c, 0x7b,0x5c, 0x7d, 0x5c, 0x5e, 0x5c, 0x24, 0x5c, 0x7c, 0x5c, 0x5c, 0x5c, 0x2e, 0x5d, 0}; 59 60 // 61 // Here are the backslash escape characters that ICU's unescape() function 62 // will handle. 63 // 64 static const UChar gUnescapeCharPattern[] = { 65 // [ a c e f n r t u U x ] 66 0x5b, 0x61, 0x63, 0x65, 0x66, 0x6e, 0x72, 0x74, 0x75, 0x55, 0x78, 0x5d, 0}; 67 68 69 // 70 // Unicode Set Definitions for Regular Expression \w 71 // 72 static const UChar gIsWordPattern[] = { 73 // [ \ p { A l p h a b e t i c } 74 0x5b, 0x5c, 0x70, 0x7b, 0x61, 0x6c, 0x70, 0x68, 0x61, 0x62, 0x65, 0x74, 0x69, 0x63, 0x7d, 75 // \ p { M } Mark 76 0x5c, 0x70, 0x7b, 0x4d, 0x7d, 77 // \ p { N d } Digit_Numeric 78 0x5c, 0x70, 0x7b, 0x4e, 0x64, 0x7d, 79 // \ p { P c } Connector_Punctuation 80 0x5c, 0x70, 0x7b, 0x50, 0x63, 0x7d, 81 // \ u 2 0 0 c \ u 2 0 0 d ] 82 0x5c, 0x75, 0x32, 0x30, 0x30, 0x63, 0x5c, 0x75, 0x32, 0x30, 0x30, 0x64, 0x5d, 0}; 83 84 85 // 86 // Unicode Set Definitions for Regular Expression \s 87 // 88 static const UChar gIsSpacePattern[] = { 89 // [ \ p { W h i t e S p a c e } ] 90 0x5b, 0x5c, 0x70, 0x7b, 0x57, 0x68, 0x69, 0x74, 0x65, 0x53, 0x70, 0x61, 0x63, 0x65, 0x7d, 0x5d, 0}; 91 92 93 // 94 // UnicodeSets used in implementation of Grapheme Cluster detection, \X 95 // 96 static const UChar gGC_ControlPattern[] = { 97 // [ [ : Z l : ] [ : Z p : ] 98 0x5b, 0x5b, 0x3a, 0x5A, 0x6c, 0x3a, 0x5d, 0x5b, 0x3a, 0x5A, 0x70, 0x3a, 0x5d, 99 // [ : C c : ] [ : C f : ] - 100 0x5b, 0x3a, 0x43, 0x63, 0x3a, 0x5d, 0x5b, 0x3a, 0x43, 0x66, 0x3a, 0x5d, 0x2d, 101 // [ : G r a p h e m e _ 102 0x5b, 0x3a, 0x47, 0x72, 0x61, 0x70, 0x68, 0x65, 0x6d, 0x65, 0x5f, 103 // E x t e n d : ] ] 104 0x45, 0x78, 0x74, 0x65, 0x6e, 0x64, 0x3a, 0x5d, 0x5d, 0}; 105 106 static const UChar gGC_ExtendPattern[] = { 107 // [ \ p { G r a p h e m e _ 108 0x5b, 0x5c, 0x70, 0x7b, 0x47, 0x72, 0x61, 0x70, 0x68, 0x65, 0x6d, 0x65, 0x5f, 109 // E x t e n d } ] 110 0x45, 0x78, 0x74, 0x65, 0x6e, 0x64, 0x7d, 0x5d, 0}; 111 112 static const UChar gGC_LPattern[] = { 113 // [ \ p { H a n g u l _ S y l 114 0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c, 115 // l a b l e _ T y p e = L } ] 116 0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x4c, 0x7d, 0x5d, 0}; 117 118 static const UChar gGC_VPattern[] = { 119 // [ \ p { H a n g u l _ S y l 120 0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c, 121 // l a b l e _ T y p e = V } ] 122 0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x56, 0x7d, 0x5d, 0}; 123 124 static const UChar gGC_TPattern[] = { 125 // [ \ p { H a n g u l _ S y l 126 0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c, 127 // l a b l e _ T y p e = T } ] 128 0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x54, 0x7d, 0x5d, 0}; 129 130 static const UChar gGC_LVPattern[] = { 131 // [ \ p { H a n g u l _ S y l 132 0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c, 133 // l a b l e _ T y p e = L V } ] 134 0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x4c, 0x56, 0x7d, 0x5d, 0}; 135 136 static const UChar gGC_LVTPattern[] = { 137 // [ \ p { H a n g u l _ S y l 138 0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c, 139 // l a b l e _ T y p e = L V T } ] 140 0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x4c, 0x56, 0x54, 0x7d, 0x5d, 0}; 141 142 143 RegexStaticSets *RegexStaticSets::gStaticSets = NULL; 144 UInitOnce gStaticSetsInitOnce = U_INITONCE_INITIALIZER; 145 146 RegexStaticSets::RegexStaticSets(UErrorCode *status) 147 : 148 fUnescapeCharSet(UnicodeString(TRUE, gUnescapeCharPattern, -1), *status), 149 fRuleDigitsAlias(NULL), 150 fEmptyText(NULL) 151 { 152 // First zero out everything 153 int i; 154 for (i=0; i<URX_LAST_SET; i++) { 155 fPropSets[i] = NULL; 156 } 157 // Then init the sets to their correct values. 158 fPropSets[URX_ISWORD_SET] = new UnicodeSet(UnicodeString(TRUE, gIsWordPattern, -1), *status); 159 fPropSets[URX_ISSPACE_SET] = new UnicodeSet(UnicodeString(TRUE, gIsSpacePattern, -1), *status); 160 fPropSets[URX_GC_EXTEND] = new UnicodeSet(UnicodeString(TRUE, gGC_ExtendPattern, -1), *status); 161 fPropSets[URX_GC_CONTROL] = new UnicodeSet(UnicodeString(TRUE, gGC_ControlPattern, -1), *status); 162 fPropSets[URX_GC_L] = new UnicodeSet(UnicodeString(TRUE, gGC_LPattern, -1), *status); 163 fPropSets[URX_GC_V] = new UnicodeSet(UnicodeString(TRUE, gGC_VPattern, -1), *status); 164 fPropSets[URX_GC_T] = new UnicodeSet(UnicodeString(TRUE, gGC_TPattern, -1), *status); 165 fPropSets[URX_GC_LV] = new UnicodeSet(UnicodeString(TRUE, gGC_LVPattern, -1), *status); 166 fPropSets[URX_GC_LVT] = new UnicodeSet(UnicodeString(TRUE, gGC_LVTPattern, -1), *status); 167 168 // Check for null pointers 169 if (fPropSets[URX_ISWORD_SET] == NULL || fPropSets[URX_ISSPACE_SET] == NULL || fPropSets[URX_GC_EXTEND] == NULL || 170 fPropSets[URX_GC_CONTROL] == NULL || fPropSets[URX_GC_L] == NULL || fPropSets[URX_GC_V] == NULL || 171 fPropSets[URX_GC_T] == NULL || fPropSets[URX_GC_LV] == NULL || fPropSets[URX_GC_LVT] == NULL) { 172 goto ExitConstrDeleteAll; 173 } 174 if (U_FAILURE(*status)) { 175 // Bail out if we were unable to create the above sets. 176 // The rest of the initialization needs them, so we cannot proceed. 177 return; 178 } 179 180 181 // 182 // The following sets are dynamically constructed, because their 183 // initialization strings would be unreasonable. 184 // 185 186 187 // 188 // "Normal" is the set of characters that don't need special handling 189 // when finding grapheme cluster boundaries. 190 // 191 fPropSets[URX_GC_NORMAL] = new UnicodeSet(0, UnicodeSet::MAX_VALUE); 192 // Null pointer check 193 if (fPropSets[URX_GC_NORMAL] == NULL) { 194 goto ExitConstrDeleteAll; 195 } 196 fPropSets[URX_GC_NORMAL]->remove(0xac00, 0xd7a4); 197 fPropSets[URX_GC_NORMAL]->removeAll(*fPropSets[URX_GC_CONTROL]); 198 fPropSets[URX_GC_NORMAL]->removeAll(*fPropSets[URX_GC_L]); 199 fPropSets[URX_GC_NORMAL]->removeAll(*fPropSets[URX_GC_V]); 200 fPropSets[URX_GC_NORMAL]->removeAll(*fPropSets[URX_GC_T]); 201 202 // Initialize the 8-bit fast bit sets from the parallel full 203 // UnicodeSets. 204 for (i=0; i<URX_LAST_SET; i++) { 205 if (fPropSets[i]) { 206 fPropSets[i]->compact(); 207 fPropSets8[i].init(fPropSets[i]); 208 } 209 } 210 211 // Sets used while parsing rules, but not referenced from the parse state table 212 fRuleSets[kRuleSet_rule_char-128] = UnicodeSet(UnicodeString(TRUE, gRuleSet_rule_char_pattern, -1), *status); 213 fRuleSets[kRuleSet_digit_char-128].add((UChar)0x30, (UChar)0x39); // [0-9] 214 fRuleSets[kRuleSet_ascii_letter-128].add((UChar)0x41, (UChar)0x5A); // [A-Z] 215 fRuleSets[kRuleSet_ascii_letter-128].add((UChar)0x61, (UChar)0x7A); // [a-z] 216 fRuleDigitsAlias = &fRuleSets[kRuleSet_digit_char-128]; 217 for (i=0; i<UPRV_LENGTHOF(fRuleSets); i++) { 218 fRuleSets[i].compact(); 219 } 220 221 // Finally, initialize an empty string for utility purposes 222 fEmptyText = utext_openUChars(NULL, NULL, 0, status); 223 224 if (U_SUCCESS(*status)) { 225 return; 226 } 227 228 ExitConstrDeleteAll: // Remove fPropSets and fRuleSets and return error 229 for (i=0; i<URX_LAST_SET; i++) { 230 delete fPropSets[i]; 231 fPropSets[i] = NULL; 232 } 233 if (U_SUCCESS(*status)) { 234 *status = U_MEMORY_ALLOCATION_ERROR; 235 } 236 } 237 238 239 RegexStaticSets::~RegexStaticSets() { 240 int32_t i; 241 242 for (i=0; i<URX_LAST_SET; i++) { 243 delete fPropSets[i]; 244 fPropSets[i] = NULL; 245 } 246 fRuleDigitsAlias = NULL; 247 248 utext_close(fEmptyText); 249 } 250 251 252 //------------------------------------------------------------------------------ 253 // 254 // regex_cleanup Memory cleanup function, free/delete all 255 // cached memory. Called by ICU's u_cleanup() function. 256 // 257 //------------------------------------------------------------------------------ 258 UBool 259 RegexStaticSets::cleanup(void) { 260 delete RegexStaticSets::gStaticSets; 261 RegexStaticSets::gStaticSets = NULL; 262 gStaticSetsInitOnce.reset(); 263 return TRUE; 264 } 265 266 U_CDECL_BEGIN 267 static UBool U_CALLCONV 268 regex_cleanup(void) { 269 return RegexStaticSets::cleanup(); 270 } 271 272 static void U_CALLCONV initStaticSets(UErrorCode &status) { 273 U_ASSERT(RegexStaticSets::gStaticSets == NULL); 274 ucln_i18n_registerCleanup(UCLN_I18N_REGEX, regex_cleanup); 275 RegexStaticSets::gStaticSets = new RegexStaticSets(&status); 276 if (U_FAILURE(status)) { 277 delete RegexStaticSets::gStaticSets; 278 RegexStaticSets::gStaticSets = NULL; 279 } 280 if (RegexStaticSets::gStaticSets == NULL && U_SUCCESS(status)) { 281 status = U_MEMORY_ALLOCATION_ERROR; 282 } 283 } 284 U_CDECL_END 285 286 void RegexStaticSets::initGlobals(UErrorCode *status) { 287 umtx_initOnce(gStaticSetsInitOnce, &initStaticSets, *status); 288 } 289 290 U_NAMESPACE_END 291 #endif // !UCONFIG_NO_REGULAR_EXPRESSIONS 292
