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    1 /*************************************************
    2 *      Perl-Compatible Regular Expressions       *
    3 *************************************************/
    4 
    5 /* PCRE is a library of functions to support regular expressions whose syntax
    6 and semantics are as close as possible to those of the Perl 5 language.
    7 
    8                        Written by Philip Hazel
    9            Copyright (c) 1997-2013 University of Cambridge
   10 
   11 -----------------------------------------------------------------------------
   12 Redistribution and use in source and binary forms, with or without
   13 modification, are permitted provided that the following conditions are met:
   14 
   15     * Redistributions of source code must retain the above copyright notice,
   16       this list of conditions and the following disclaimer.
   17 
   18     * Redistributions in binary form must reproduce the above copyright
   19       notice, this list of conditions and the following disclaimer in the
   20       documentation and/or other materials provided with the distribution.
   21 
   22     * Neither the name of the University of Cambridge nor the names of its
   23       contributors may be used to endorse or promote products derived from
   24       this software without specific prior written permission.
   25 
   26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   27 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   30 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36 POSSIBILITY OF SUCH DAMAGE.
   37 -----------------------------------------------------------------------------
   38 */
   39 
   40 
   41 /* This module contains an internal function that is used to match an extended
   42 class. It is used by both pcre_exec() and pcre_def_exec(). */
   43 
   44 
   45 #ifdef HAVE_CONFIG_H
   46 #include "config.h"
   47 #endif
   48 
   49 #include "pcre_internal.h"
   50 
   51 
   52 /*************************************************
   53 *       Match character against an XCLASS        *
   54 *************************************************/
   55 
   56 /* This function is called to match a character against an extended class that
   57 might contain values > 255 and/or Unicode properties.
   58 
   59 Arguments:
   60   c           the character
   61   data        points to the flag byte of the XCLASS data
   62 
   63 Returns:      TRUE if character matches, else FALSE
   64 */
   65 
   66 BOOL
   67 PRIV(xclass)(pcre_uint32 c, const pcre_uchar *data, BOOL utf)
   68 {
   69 pcre_uchar t;
   70 BOOL negated = (*data & XCL_NOT) != 0;
   71 
   72 (void)utf;
   73 #ifdef COMPILE_PCRE8
   74 /* In 8 bit mode, this must always be TRUE. Help the compiler to know that. */
   75 utf = TRUE;
   76 #endif
   77 
   78 /* Character values < 256 are matched against a bitmap, if one is present. If
   79 not, we still carry on, because there may be ranges that start below 256 in the
   80 additional data. */
   81 
   82 if (c < 256)
   83   {
   84   if ((*data & XCL_HASPROP) == 0)
   85     {
   86     if ((*data & XCL_MAP) == 0) return negated;
   87     return (((pcre_uint8 *)(data + 1))[c/8] & (1 << (c&7))) != 0;
   88     }
   89   if ((*data & XCL_MAP) != 0 &&
   90     (((pcre_uint8 *)(data + 1))[c/8] & (1 << (c&7))) != 0)
   91     return !negated; /* char found */
   92   }
   93 
   94 /* First skip the bit map if present. Then match against the list of Unicode
   95 properties or large chars or ranges that end with a large char. We won't ever
   96 encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */
   97 
   98 if ((*data++ & XCL_MAP) != 0) data += 32 / sizeof(pcre_uchar);
   99 
  100 while ((t = *data++) != XCL_END)
  101   {
  102   pcre_uint32 x, y;
  103   if (t == XCL_SINGLE)
  104     {
  105 #ifdef SUPPORT_UTF
  106     if (utf)
  107       {
  108       GETCHARINC(x, data); /* macro generates multiple statements */
  109       }
  110     else
  111 #endif
  112       x = *data++;
  113     if (c == x) return !negated;
  114     }
  115   else if (t == XCL_RANGE)
  116     {
  117 #ifdef SUPPORT_UTF
  118     if (utf)
  119       {
  120       GETCHARINC(x, data); /* macro generates multiple statements */
  121       GETCHARINC(y, data); /* macro generates multiple statements */
  122       }
  123     else
  124 #endif
  125       {
  126       x = *data++;
  127       y = *data++;
  128       }
  129     if (c >= x && c <= y) return !negated;
  130     }
  131 
  132 #ifdef SUPPORT_UCP
  133   else  /* XCL_PROP & XCL_NOTPROP */
  134     {
  135     const ucd_record *prop = GET_UCD(c);
  136     BOOL isprop = t == XCL_PROP;
  137 
  138     switch(*data)
  139       {
  140       case PT_ANY:
  141       if (isprop) return !negated;
  142       break;
  143 
  144       case PT_LAMP:
  145       if ((prop->chartype == ucp_Lu || prop->chartype == ucp_Ll ||
  146            prop->chartype == ucp_Lt) == isprop) return !negated;
  147       break;
  148 
  149       case PT_GC:
  150       if ((data[1] == PRIV(ucp_gentype)[prop->chartype]) == isprop)
  151         return !negated;
  152       break;
  153 
  154       case PT_PC:
  155       if ((data[1] == prop->chartype) == isprop) return !negated;
  156       break;
  157 
  158       case PT_SC:
  159       if ((data[1] == prop->script) == isprop) return !negated;
  160       break;
  161 
  162       case PT_ALNUM:
  163       if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
  164            PRIV(ucp_gentype)[prop->chartype] == ucp_N) == isprop)
  165         return !negated;
  166       break;
  167 
  168       /* Perl space used to exclude VT, but from Perl 5.18 it is included,
  169       which means that Perl space and POSIX space are now identical. PCRE
  170       was changed at release 8.34. */
  171 
  172       case PT_SPACE:    /* Perl space */
  173       case PT_PXSPACE:  /* POSIX space */
  174       switch(c)
  175         {
  176         HSPACE_CASES:
  177         VSPACE_CASES:
  178         if (isprop) return !negated;
  179         break;
  180 
  181         default:
  182         if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z) == isprop)
  183           return !negated;
  184         break;
  185         }
  186       break;
  187 
  188       case PT_WORD:
  189       if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
  190            PRIV(ucp_gentype)[prop->chartype] == ucp_N || c == CHAR_UNDERSCORE)
  191              == isprop)
  192         return !negated;
  193       break;
  194 
  195       case PT_UCNC:
  196       if (c < 0xa0)
  197         {
  198         if ((c == CHAR_DOLLAR_SIGN || c == CHAR_COMMERCIAL_AT ||
  199              c == CHAR_GRAVE_ACCENT) == isprop)
  200           return !negated;
  201         }
  202       else
  203         {
  204         if ((c < 0xd800 || c > 0xdfff) == isprop)
  205           return !negated;
  206         }
  207       break;
  208 
  209       /* The following three properties can occur only in an XCLASS, as there
  210       is no \p or \P coding for them. */
  211 
  212       /* Graphic character. Implement this as not Z (space or separator) and
  213       not C (other), except for Cf (format) with a few exceptions. This seems
  214       to be what Perl does. The exceptional characters are:
  215 
  216       U+061C           Arabic Letter Mark
  217       U+180E           Mongolian Vowel Separator
  218       U+2066 - U+2069  Various "isolate"s
  219       */
  220 
  221       case PT_PXGRAPH:
  222       if ((PRIV(ucp_gentype)[prop->chartype] != ucp_Z &&
  223             (PRIV(ucp_gentype)[prop->chartype] != ucp_C ||
  224               (prop->chartype == ucp_Cf &&
  225                 c != 0x061c && c != 0x180e && (c < 0x2066 || c > 0x2069))
  226          )) == isprop)
  227         return !negated;
  228       break;
  229 
  230       /* Printable character: same as graphic, with the addition of Zs, i.e.
  231       not Zl and not Zp, and U+180E. */
  232 
  233       case PT_PXPRINT:
  234       if ((prop->chartype != ucp_Zl &&
  235            prop->chartype != ucp_Zp &&
  236             (PRIV(ucp_gentype)[prop->chartype] != ucp_C ||
  237               (prop->chartype == ucp_Cf &&
  238                 c != 0x061c && (c < 0x2066 || c > 0x2069))
  239          )) == isprop)
  240         return !negated;
  241       break;
  242 
  243       /* Punctuation: all Unicode punctuation, plus ASCII characters that
  244       Unicode treats as symbols rather than punctuation, for Perl
  245       compatibility (these are $+<=>^`|~). */
  246 
  247       case PT_PXPUNCT:
  248       if ((PRIV(ucp_gentype)[prop->chartype] == ucp_P ||
  249             (c < 128 && PRIV(ucp_gentype)[prop->chartype] == ucp_S)) == isprop)
  250         return !negated;
  251       break;
  252 
  253       /* This should never occur, but compilers may mutter if there is no
  254       default. */
  255 
  256       default:
  257       return FALSE;
  258       }
  259 
  260     data += 2;
  261     }
  262 #endif  /* SUPPORT_UCP */
  263   }
  264 
  265 return negated;   /* char did not match */
  266 }
  267 
  268 /* End of pcre_xclass.c */