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