1 // 2 // regexst.h 3 // 4 // Copyright (C) 2004-2010, 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, 0x5d, 0}; 84 85 86 // 87 // Unicode Set Definitions for Regular Expression \s 88 // 89 static const UChar gIsSpacePattern[] = { 90 // [ \ p { W h i t e S p a c e } ] 91 0x5b, 0x5c, 0x70, 0x7b, 0x57, 0x68, 0x69, 0x74, 0x65, 0x53, 0x70, 0x61, 0x63, 0x65, 0x7d, 0x5d, 0}; 92 93 94 // 95 // UnicodeSets used in implementation of Grapheme Cluster detection, \X 96 // 97 static const UChar gGC_ControlPattern[] = { 98 // [ [ : Z l : ] [ : Z p : ] 99 0x5b, 0x5b, 0x3a, 0x5A, 0x6c, 0x3a, 0x5d, 0x5b, 0x3a, 0x5A, 0x70, 0x3a, 0x5d, 100 // [ : C c : ] [ : C f : ] - 101 0x5b, 0x3a, 0x43, 0x63, 0x3a, 0x5d, 0x5b, 0x3a, 0x43, 0x66, 0x3a, 0x5d, 0x2d, 102 // [ : G r a p h e m e _ 103 0x5b, 0x3a, 0x47, 0x72, 0x61, 0x70, 0x68, 0x65, 0x6d, 0x65, 0x5f, 104 // E x t e n d : ] ] 105 0x45, 0x78, 0x74, 0x65, 0x6e, 0x64, 0x3a, 0x5d, 0x5d, 0}; 106 107 static const UChar gGC_ExtendPattern[] = { 108 // [ \ p { G r a p h e m e _ 109 0x5b, 0x5c, 0x70, 0x7b, 0x47, 0x72, 0x61, 0x70, 0x68, 0x65, 0x6d, 0x65, 0x5f, 110 // E x t e n d } ] 111 0x45, 0x78, 0x74, 0x65, 0x6e, 0x64, 0x7d, 0x5d, 0}; 112 113 static const UChar gGC_LPattern[] = { 114 // [ \ p { H a n g u l _ S y l 115 0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c, 116 // l a b l e _ T y p e = L } ] 117 0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x4c, 0x7d, 0x5d, 0}; 118 119 static const UChar gGC_VPattern[] = { 120 // [ \ p { H a n g u l _ S y l 121 0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c, 122 // l a b l e _ T y p e = V } ] 123 0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x56, 0x7d, 0x5d, 0}; 124 125 static const UChar gGC_TPattern[] = { 126 // [ \ p { H a n g u l _ S y l 127 0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c, 128 // l a b l e _ T y p e = T } ] 129 0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x54, 0x7d, 0x5d, 0}; 130 131 static const UChar gGC_LVPattern[] = { 132 // [ \ p { H a n g u l _ S y l 133 0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c, 134 // l a b l e _ T y p e = L V } ] 135 0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x4c, 0x56, 0x7d, 0x5d, 0}; 136 137 static const UChar gGC_LVTPattern[] = { 138 // [ \ p { H a n g u l _ S y l 139 0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c, 140 // l a b l e _ T y p e = L V T } ] 141 0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x4c, 0x56, 0x54, 0x7d, 0x5d, 0}; 142 143 144 RegexStaticSets *RegexStaticSets::gStaticSets = NULL; 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] = UnicodeSet(UnicodeString(TRUE, gRuleSet_digit_char_pattern, -1), *status); 214 fRuleDigitsAlias = &fRuleSets[kRuleSet_digit_char-128]; 215 for (i=0; i<(int32_t)(sizeof(fRuleSets)/sizeof(fRuleSets[0])); 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 return; // If we reached this point, everything is fine so just exit 223 224 ExitConstrDeleteAll: // Remove fPropSets and fRuleSets and return error 225 for (i=0; i<URX_LAST_SET; i++) { 226 delete fPropSets[i]; 227 fPropSets[i] = NULL; 228 } 229 *status = U_MEMORY_ALLOCATION_ERROR; 230 } 231 232 233 RegexStaticSets::~RegexStaticSets() { 234 int32_t i; 235 236 for (i=0; i<URX_LAST_SET; i++) { 237 delete fPropSets[i]; 238 fPropSets[i] = NULL; 239 } 240 fRuleDigitsAlias = NULL; 241 242 utext_close(fEmptyText); 243 } 244 245 246 //------------------------------------------------------------------------------ 247 // 248 // regex_cleanup Memory cleanup function, free/delete all 249 // cached memory. Called by ICU's u_cleanup() function. 250 // 251 //------------------------------------------------------------------------------ 252 UBool 253 RegexStaticSets::cleanup(void) { 254 delete RegexStaticSets::gStaticSets; 255 RegexStaticSets::gStaticSets = NULL; 256 return TRUE; 257 } 258 259 U_CDECL_BEGIN 260 static UBool U_CALLCONV 261 regex_cleanup(void) { 262 return RegexStaticSets::cleanup(); 263 } 264 U_CDECL_END 265 266 void RegexStaticSets::initGlobals(UErrorCode *status) { 267 RegexStaticSets *p; 268 UMTX_CHECK(NULL, gStaticSets, p); 269 if (p == NULL) { 270 p = new RegexStaticSets(status); 271 if (p == NULL) { 272 *status = U_MEMORY_ALLOCATION_ERROR; 273 return; 274 } 275 if (U_FAILURE(*status)) { 276 delete p; 277 return; 278 } 279 umtx_lock(NULL); 280 if (gStaticSets == NULL) { 281 gStaticSets = p; 282 p = NULL; 283 } 284 umtx_unlock(NULL); 285 if (p) { 286 delete p; 287 } 288 ucln_i18n_registerCleanup(UCLN_I18N_REGEX, regex_cleanup); 289 } 290 } 291 292 293 U_NAMESPACE_END 294 #endif // !UCONFIG_NO_REGULAR_EXPRESSIONS 295
