icuSources/i18n/regexst.cpp

   1 //
   2 //  regexst.h
   3 //
   4 //  Copyright (C) 2004, 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 //static const UnicodeSet *gRuleDigits = NULL;
  63
  64
  65
  66 //
  67 //   Here are the backslash escape characters that ICU's unescape() function
  68 //    will handle.
  69 //
  70 static const UChar gUnescapeCharPattern[] = {
  71 //    [     a     c     e     f     n     r     t     u     U     x    ]
  72     0x5b, 0x61, 0x63, 0x65, 0x66, 0x6e, 0x72, 0x74, 0x75, 0x55, 0x78, 0x5d, 0};
  73
  74
  75 //
  76 //  White space characters that may appear within a pattern in free-form mode
  77 //
  78 static const UChar gRuleWhiteSpacePattern[] = {
  79     /* "[[:Cf:][:WSpace:]]" */
  80     91, 91, 58, 67, 102, 58, 93, 91, 58, 87,
  81         83, 112, 97, 99, 101, 58, 93, 93, 0 };
  82
  83
  84
  85 //
  86 //  Unicode Set Definitions for Regular Expression  \w
  87 //
  88 static const UChar gIsWordPattern[] = {
  89 //    [     \     p     {    A     l     p     h     a     b     e     t     i      c    }
  90     0x5b, 0x5c, 0x70, 0x7b, 0x61, 0x6c, 0x70, 0x68, 0x61, 0x62, 0x65, 0x74, 0x69, 0x63, 0x7d,
  91 //          \     p     {    M     }                               Mark
  92           0x5c, 0x70, 0x7b, 0x4d, 0x7d,
  93 //          \     p     {    N     d     }                         Digit_Numeric
  94           0x5c, 0x70, 0x7b, 0x4e, 0x64, 0x7d,
  95 //          \     p     {    P     c     }      ]                  Connector_Punctuation
  96           0x5c, 0x70, 0x7b, 0x50, 0x63, 0x7d, 0x5d, 0};
  97
  98
  99 //
 100 //  Unicode Set Definitions for Regular Expression  \s
 101 //
 102     static const UChar gIsSpacePattern[] = {
 103 //        [     \     p     {     W     h     i     t     e     S     p     a     c     e     }     ]
 104         0x5b, 0x5c, 0x70, 0x7b, 0x57, 0x68, 0x69, 0x74, 0x65, 0x53, 0x70, 0x61, 0x63, 0x65, 0x7d, 0x5d, 0};
 105
 106
 107 //
 108 //  UnicodeSets used in implementation of Grapheme Cluster detection, \X
 109 //
 110     static const UChar gGC_ControlPattern[] = {
 111 //    [     [     :     Z     l     :     ]     [     :     Z     p     :     ]
 112     0x5b, 0x5b, 0x3a, 0x5A, 0x6c, 0x3a, 0x5d, 0x5b, 0x3a, 0x5A, 0x70, 0x3a, 0x5d,
 113 //    [     :     C     c     :     ]     [     :     C     f     :     ]     -
 114     0x5b, 0x3a, 0x43, 0x63, 0x3a, 0x5d, 0x5b, 0x3a, 0x43, 0x66, 0x3a, 0x5d, 0x2d,
 115 //    [     :     G     r     a     p     h     e     m     e     _
 116     0x5b, 0x3a, 0x47, 0x72, 0x61, 0x70, 0x68, 0x65, 0x6d, 0x65, 0x5f,
 117 //    E     x     t     e     n     d     :     ]     ]
 118     0x45, 0x78, 0x74, 0x65, 0x6e, 0x64, 0x3a, 0x5d, 0x5d, 0};
 119
 120     static const UChar gGC_ExtendPattern[] = {
 121 //    [     \     p     {     G     r     a     p     h     e     m     e     _
 122     0x5b, 0x5c, 0x70, 0x7b, 0x47, 0x72, 0x61, 0x70, 0x68, 0x65, 0x6d, 0x65, 0x5f,
 123 //    E     x     t     e     n     d     }     ]
 124     0x45, 0x78, 0x74, 0x65, 0x6e, 0x64, 0x7d, 0x5d, 0};
 125
 126     static const UChar gGC_LPattern[] = {
 127 //    [     \     p     {     H     a     n     g     u     l     _     S     y     l
 128     0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c,
 129 //    l     a     b     l     e     _     T     y     p     e     =     L     }     ]
 130     0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x4c, 0x7d,  0x5d, 0};
 131
 132     static const UChar gGC_VPattern[] = {
 133 //    [     \     p     {     H     a     n     g     u     l     _     S     y     l
 134     0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c,
 135 //    l     a     b     l     e     _     T     y     p     e     =     V     }     ]
 136     0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x56, 0x7d,  0x5d, 0};
 137
 138     static const UChar gGC_TPattern[] = {
 139 //    [     \     p     {     H     a     n     g     u     l     _     S     y     l
 140     0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c,
 141 //    l     a     b     l     e     _     T     y     p     e     =     T     }    ]
 142     0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x54, 0x7d, 0x5d, 0};
 143
 144     static const UChar gGC_LVPattern[] = {
 145 //    [     \     p     {     H     a     n     g     u     l     _     S     y     l
 146     0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c,
 147 //    l     a     b     l     e     _     T     y     p     e     =     L     V     }     ]
 148     0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x4c, 0x56, 0x7d, 0x5d, 0};
 149
 150     static const UChar gGC_LVTPattern[] = {
 151 //    [     \     p     {     H     a     n     g     u     l     _     S     y     l
 152     0x5b, 0x5c, 0x70, 0x7b, 0x48, 0x61, 0x6e, 0x67, 0x75, 0x6c, 0x5f, 0x53, 0x79, 0x6c,
 153 //    l     a     b     l     e     _     T     y     p     e     =     L     V     T     }     ]
 154     0x6c, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x54, 0x79, 0x70, 0x65, 0x3d, 0x4c, 0x56, 0x54, 0x7d, 0x5d, 0};
 155
 156 RegexStaticSets *RegexStaticSets::gStaticSets = NULL;
 157
 158 RegexStaticSets::RegexStaticSets(UErrorCode *status) {
 159     // First zero out everything
 160     int i;
 161     for (i=0; i<URX_LAST_SET; i++) {
 162         fPropSets[i] = NULL;
 163     }
 164     for (i=0; i<10; i++) {
 165         fRuleSets[i] = NULL;
 166     }
 167     fUnescapeCharSet = NULL;
 168     fRuleDigits      = NULL;
 169     fEmptyString     = NULL;
 170
 171     // Then init the sets to their correct values.
 172     fPropSets[URX_ISWORD_SET]  = new UnicodeSet(gIsWordPattern,     *status);
 173     fPropSets[URX_ISSPACE_SET] = new UnicodeSet(gIsSpacePattern,    *status);
 174     fPropSets[URX_GC_EXTEND]   = new UnicodeSet(gGC_ExtendPattern,  *status);
 175     fPropSets[URX_GC_CONTROL]  = new UnicodeSet(gGC_ControlPattern, *status);
 176     fPropSets[URX_GC_L]        = new UnicodeSet(gGC_LPattern,       *status);
 177     fPropSets[URX_GC_V]        = new UnicodeSet(gGC_VPattern,       *status);
 178     fPropSets[URX_GC_T]        = new UnicodeSet(gGC_TPattern,       *status);
 179     fPropSets[URX_GC_LV]       = new UnicodeSet(gGC_LVPattern,      *status);
 180     fPropSets[URX_GC_LVT]      = new UnicodeSet(gGC_LVTPattern,     *status);
 181     if (U_FAILURE(*status)) {
 182         // Bail out if we were unable to create the above sets.
 183         // The rest of the initialization needs them, so we cannot proceed.
 184         return;
 185     }
 186
 187
 188     //
 189     // The following sets  are dynamically constructed, because their
 190     //   intialization strings would be unreasonable.
 191     //
 192
 193
 194     //
 195     //  "Normal" is the set of characters that don't need special handling
 196     //            when finding grapheme cluster boundaries.
 197     //
 198     fPropSets[URX_GC_NORMAL] = new UnicodeSet;
 199     fPropSets[URX_GC_NORMAL]->complement();
 200     fPropSets[URX_GC_NORMAL]->remove(0xac00, 0xd7a4);
 201     fPropSets[URX_GC_NORMAL]->removeAll(*fPropSets[URX_GC_CONTROL]);
 202     fPropSets[URX_GC_NORMAL]->removeAll(*fPropSets[URX_GC_L]);
 203     fPropSets[URX_GC_NORMAL]->removeAll(*fPropSets[URX_GC_V]);
 204     fPropSets[URX_GC_NORMAL]->removeAll(*fPropSets[URX_GC_T]);
 205
 206     // Initialize the 8-bit fast bit sets from the parallel full
 207     //   UnicodeSets.
 208     for (i=0; i<URX_LAST_SET; i++) {
 209         fPropSets8[i].init(fPropSets[i]);
 210     }
 211
 212     // Sets used while parsing rules, but not referenced from the parse state table
 213     fRuleSets[kRuleSet_rule_char-128]   = new UnicodeSet(gRuleSet_rule_char_pattern,  *status);
 214     fRuleSets[kRuleSet_white_space-128] = new UnicodeSet(gRuleWhiteSpacePattern,      *status);
 215     fRuleSets[kRuleSet_digit_char-128]  = new UnicodeSet(gRuleSet_digit_char_pattern, *status);
 216     fRuleDigits                         = new UnicodeSet(gRuleSet_digit_char_pattern, *status);
 217     fUnescapeCharSet                    = new UnicodeSet(gUnescapeCharPattern,        *status);
 218
 219     // Empty UnicodeString, for use by matchers with NULL input.
 220     fEmptyString = new UnicodeString;
 221 }
 222
 223
 224 RegexStaticSets::~RegexStaticSets() {
 225     int i;
 226
 227     for (i=0; i<URX_LAST_SET; i++) {
 228         delete fPropSets[i];
 229         fPropSets[i] = NULL;
 230     }
 231     for (i=0; i<10; i++) {
 232         delete fRuleSets[i];
 233         fRuleSets[i] = NULL;
 234     }
 235     delete fUnescapeCharSet;
 236     fUnescapeCharSet = NULL;
 237     delete fRuleDigits;
 238     fRuleDigits = NULL;
 239     delete fEmptyString;
 240     fEmptyString = NULL;
 241 }
 242
 243
 244 //----------------------------------------------------------------------------------
 245 //
 246 //   regex_cleanup      Memory cleanup function, free/delete all
 247 //                      cached memory.  Called by ICU's u_cleanup() function.
 248 //
 249 //----------------------------------------------------------------------------------
 250 UBool
 251 RegexStaticSets::cleanup(void) {
 252     delete RegexStaticSets::gStaticSets;
 253     RegexStaticSets::gStaticSets = NULL;
 254     return TRUE;
 255 }
 256
 257 U_CDECL_BEGIN
 258 static UBool U_CALLCONV
 259 regex_cleanup(void) {
 260     return RegexStaticSets::cleanup();
 261 }
 262 U_CDECL_END
 263
 264 void RegexStaticSets::initGlobals(UErrorCode *status) {
 265     umtx_lock(NULL);
 266     RegexStaticSets *p = gStaticSets;
 267     umtx_unlock(NULL);
 268     if (p == NULL) {
 269         p = new RegexStaticSets(status);
 270         if (U_FAILURE(*status)) {
 271             delete p;
 272             return;
 273         }
 274         umtx_lock(NULL);
 275         if (gStaticSets == NULL) {
 276             gStaticSets = p;
 277             p = NULL;
 278         }
 279         umtx_unlock(NULL);
 280         if (p) {
 281             delete p;
 282         }
 283         ucln_i18n_registerCleanup(UCLN_I18N_REGEX, regex_cleanup);
 284     }
 285 }
 286
 287
 288 U_NAMESPACE_END
 289 #endif  // !UCONFIG_NO_REGULAR_EXPRESSIONS