1 // 2 // regexst.h 3 // 4 // Copyright (C) 2004-2013, 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 static const UChar gRuleSet_digit_char_pattern[] = { 60 // [ 0 - 9 ] 61 0x5b, 0x30, 0x2d, 0x39, 0x5d, 0}; 62 63 // 64 // Here are the backslash escape characters that ICU's unescape() function 65 // will handle. 66 // 67 static const UChar gUnescapeCharPattern[] = { 68 // [ a c e f n r t u U x ] 69 0x5b, 0x61, 0x63, 0x65, 0x66, 0x6e, 0x72, 0x74, 0x75, 0x55, 0x78, 0x5d, 0}; 70 71 72 // 73 // Unicode Set Definitions for Regular Expression \w 74 // 75 static const UChar gIsWordPattern[] = { 76 // [ \ p { A l p h a b e t i c } 77 0x5b, 0x5c, 0x70, 0x7b, 0x61, 0x6c, 0x70, 0x68, 0x61, 0x62, 0x65, 0x74, 0x69, 0x63, 0x7d, 78 // \ p { M } Mark 79 0x5c, 0x70, 0x7b, 0x4d, 0x7d, 80 // \ p { N d } Digit_Numeric 81 0x5c, 0x70, 0x7b, 0x4e, 0x64, 0x7d, 82 // \ p { P c } Connector_Punctuation 83 0x5c, 0x70, 0x7b, 0x50, 0x63, 0x7d, 84 // \ u 2 0 0 c \ u 2 0 0 d ] 85 0x5c, 0x75, 0x32, 0x30, 0x30, 0x63, 0x5c, 0x75, 0x32, 0x30, 0x30, 0x64, 0x5d, 0}; 86 87 88 // 89 // Unicode Set Definitions for Regular Expression \s 90 // 91 static const UChar gIsSpacePattern[] = { 92 // [ \ p { W h i t e S p a c e } ] 93 0x5b, 0x5c, 0x70, 0x7b, 0x57, 0x68, 0x69, 0x74, 0x65, 0x53, 0x70, 0x61, 0x63, 0x65, 0x7d, 0x5d, 0}; 94 95 96 // 97 // UnicodeSets used in implementation of Grapheme Cluster detection, \X 98 // 99 static const UChar gGC_ControlPattern[] = { 100 // [ [ : Z l : ] [ : Z p : ] 101 0x5b, 0x5b, 0x3a, 0x5A, 0x6c, 0x3a, 0x5d, 0x5b, 0x3a, 0x5A, 0x70, 0x3a, 0x5d, 102 // [ : C c : ] [ : C f : ] - 103 0x5b, 0x3a, 0x43, 0x63, 0x3a, 0x5d, 0x5b, 0x3a, 0x43, 0x66, 0x3a, 0x5d, 0x2d, 104 // [ : G r a p h e m e _ 105 0x5b, 0x3a, 0x47, 0x72, 0x61, 0x70, 0x68, 0x65, 0x6d, 0x65, 0x5f, 106 // E x t e n d : ] ] 107 0x45, 0x78, 0x74, 0x65, 0x6e, 0x64, 0x3a, 0x5d, 0x5d, 0}; 108 109 static const UChar gGC_ExtendPattern[] = { 110 // [ \ p { G r a p h e m e _ 111 0x5b, 0x5c, 0x70, 0x7b, 0x47, 0x72, 0x61, 0x70, 0x68, 0x65, 0x6d, 0x65, 0x5f, 112 // E x t e n d } ] 113 0x45, 0x78, 0x74, 0x65, 0x6e, 0x64, 0x7d, 0x5d, 0}; 114 115 static const UChar gGC_LPattern[] = { 116 // [ \ p { H a n g u l _ S y l 117 0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c, 118 // l a b l e _ T y p e = L } ] 119 0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x4c, 0x7d, 0x5d, 0}; 120 121 static const UChar gGC_VPattern[] = { 122 // [ \ p { H a n g u l _ S y l 123 0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c, 124 // l a b l e _ T y p e = V } ] 125 0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x56, 0x7d, 0x5d, 0}; 126 127 static const UChar gGC_TPattern[] = { 128 // [ \ p { H a n g u l _ S y l 129 0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c, 130 // l a b l e _ T y p e = T } ] 131 0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x54, 0x7d, 0x5d, 0}; 132 133 static const UChar gGC_LVPattern[] = { 134 // [ \ p { H a n g u l _ S y l 135 0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c, 136 // l a b l e _ T y p e = L V } ] 137 0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x4c, 0x56, 0x7d, 0x5d, 0}; 138 139 static const UChar gGC_LVTPattern[] = { 140 // [ \ p { H a n g u l _ S y l 141 0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c, 142 // l a b l e _ T y p e = L V T } ] 143 0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x4c, 0x56, 0x54, 0x7d, 0x5d, 0}; 144 145 146 RegexStaticSets *RegexStaticSets::gStaticSets = NULL; 147 UInitOnce gStaticSetsInitOnce = U_INITONCE_INITIALIZER; 148 149 RegexStaticSets::RegexStaticSets(UErrorCode *status) 150 : 151 fUnescapeCharSet(UnicodeString(TRUE, gUnescapeCharPattern, -1), *status), 152 fRuleDigitsAlias(NULL), 153 fEmptyText(NULL) 154 { 155 // First zero out everything 156 int i; 157 for (i=0; i<URX_LAST_SET; i++) { 158 fPropSets[i] = NULL; 159 } 160 // Then init the sets to their correct values. 161 fPropSets[URX_ISWORD_SET] = new UnicodeSet(UnicodeString(TRUE, gIsWordPattern, -1), *status); 162 fPropSets[URX_ISSPACE_SET] = new UnicodeSet(UnicodeString(TRUE, gIsSpacePattern, -1), *status); 163 fPropSets[URX_GC_EXTEND] = new UnicodeSet(UnicodeString(TRUE, gGC_ExtendPattern, -1), *status); 164 fPropSets[URX_GC_CONTROL] = new UnicodeSet(UnicodeString(TRUE, gGC_ControlPattern, -1), *status); 165 fPropSets[URX_GC_L] = new UnicodeSet(UnicodeString(TRUE, gGC_LPattern, -1), *status); 166 fPropSets[URX_GC_V] = new UnicodeSet(UnicodeString(TRUE, gGC_VPattern, -1), *status); 167 fPropSets[URX_GC_T] = new UnicodeSet(UnicodeString(TRUE, gGC_TPattern, -1), *status); 168 fPropSets[URX_GC_LV] = new UnicodeSet(UnicodeString(TRUE, gGC_LVPattern, -1), *status); 169 fPropSets[URX_GC_LVT] = new UnicodeSet(UnicodeString(TRUE, gGC_LVTPattern, -1), *status); 170 171 // Check for null pointers 172 if (fPropSets[URX_ISWORD_SET] == NULL || fPropSets[URX_ISSPACE_SET] == NULL || fPropSets[URX_GC_EXTEND] == NULL || 173 fPropSets[URX_GC_CONTROL] == NULL || fPropSets[URX_GC_L] == NULL || fPropSets[URX_GC_V] == NULL || 174 fPropSets[URX_GC_T] == NULL || fPropSets[URX_GC_LV] == NULL || fPropSets[URX_GC_LVT] == NULL) { 175 goto ExitConstrDeleteAll; 176 } 177 if (U_FAILURE(*status)) { 178 // Bail out if we were unable to create the above sets. 179 // The rest of the initialization needs them, so we cannot proceed. 180 return; 181 } 182 183 184 // 185 // The following sets are dynamically constructed, because their 186 // initialization strings would be unreasonable. 187 // 188 189 190 // 191 // "Normal" is the set of characters that don't need special handling 192 // when finding grapheme cluster boundaries. 193 // 194 fPropSets[URX_GC_NORMAL] = new UnicodeSet(0, UnicodeSet::MAX_VALUE); 195 // Null pointer check 196 if (fPropSets[URX_GC_NORMAL] == NULL) { 197 goto ExitConstrDeleteAll; 198 } 199 fPropSets[URX_GC_NORMAL]->remove(0xac00, 0xd7a4); 200 fPropSets[URX_GC_NORMAL]->removeAll(*fPropSets[URX_GC_CONTROL]); 201 fPropSets[URX_GC_NORMAL]->removeAll(*fPropSets[URX_GC_L]); 202 fPropSets[URX_GC_NORMAL]->removeAll(*fPropSets[URX_GC_V]); 203 fPropSets[URX_GC_NORMAL]->removeAll(*fPropSets[URX_GC_T]); 204 205 // Initialize the 8-bit fast bit sets from the parallel full 206 // UnicodeSets. 207 for (i=0; i<URX_LAST_SET; i++) { 208 if (fPropSets[i]) { 209 fPropSets[i]->compact(); 210 fPropSets8[i].init(fPropSets[i]); 211 } 212 } 213 214 // Sets used while parsing rules, but not referenced from the parse state table 215 fRuleSets[kRuleSet_rule_char-128] = UnicodeSet(UnicodeString(TRUE, gRuleSet_rule_char_pattern, -1), *status); 216 fRuleSets[kRuleSet_digit_char-128] = UnicodeSet(UnicodeString(TRUE, gRuleSet_digit_char_pattern, -1), *status); 217 fRuleDigitsAlias = &fRuleSets[kRuleSet_digit_char-128]; 218 for (i=0; i<(int32_t)(sizeof(fRuleSets)/sizeof(fRuleSets[0])); i++) { 219 fRuleSets[i].compact(); 220 } 221 222 // Finally, initialize an empty string for utility purposes 223 fEmptyText = utext_openUChars(NULL, NULL, 0, status); 224 225 return; // If we reached this point, everything is fine so just exit 226 227 ExitConstrDeleteAll: // Remove fPropSets and fRuleSets and return error 228 for (i=0; i<URX_LAST_SET; i++) { 229 delete fPropSets[i]; 230 fPropSets[i] = NULL; 231 } 232 *status = U_MEMORY_ALLOCATION_ERROR; 233 } 234 235 236 RegexStaticSets::~RegexStaticSets() { 237 int32_t i; 238 239 for (i=0; i<URX_LAST_SET; i++) { 240 delete fPropSets[i]; 241 fPropSets[i] = NULL; 242 } 243 fRuleDigitsAlias = NULL; 244 245 utext_close(fEmptyText); 246 } 247 248 249 //------------------------------------------------------------------------------ 250 // 251 // regex_cleanup Memory cleanup function, free/delete all 252 // cached memory. Called by ICU's u_cleanup() function. 253 // 254 //------------------------------------------------------------------------------ 255 UBool 256 RegexStaticSets::cleanup(void) { 257 delete RegexStaticSets::gStaticSets; 258 RegexStaticSets::gStaticSets = NULL; 259 gStaticSetsInitOnce.reset(); 260 return TRUE; 261 } 262 263 U_CDECL_BEGIN 264 static UBool U_CALLCONV 265 regex_cleanup(void) { 266 return RegexStaticSets::cleanup(); 267 } 268 269 static void U_CALLCONV initStaticSets(UErrorCode &status) { 270 U_ASSERT(RegexStaticSets::gStaticSets == NULL); 271 ucln_i18n_registerCleanup(UCLN_I18N_REGEX, regex_cleanup); 272 RegexStaticSets::gStaticSets = new RegexStaticSets(&status); 273 if (U_FAILURE(status)) { 274 delete RegexStaticSets::gStaticSets; 275 RegexStaticSets::gStaticSets = NULL; 276 } 277 if (RegexStaticSets::gStaticSets == NULL && U_SUCCESS(status)) { 278 status = U_MEMORY_ALLOCATION_ERROR; 279 } 280 } 281 U_CDECL_END 282 283 void RegexStaticSets::initGlobals(UErrorCode *status) { 284 umtx_initOnce(gStaticSetsInitOnce, &initStaticSets, *status); 285 } 286 287 U_NAMESPACE_END 288 #endif // !UCONFIG_NO_REGULAR_EXPRESSIONS 289
