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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) 1997-2012 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)(int c, const pcre_uchar *data, BOOL utf)
   68 {
   69 int 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_MAP) != 0 &&
   85     (((pcre_uint8 *)(data + 1))[c/8] & (1 << (c&7))) != 0)
   86     return !negated; /* char found */
   87   }
   88 
   89 /* First skip the bit map if present. Then match against the list of Unicode
   90 properties or large chars or ranges that end with a large char. We won't ever
   91 encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */
   92 
   93 if ((*data++ & XCL_MAP) != 0) data += 32 / sizeof(pcre_uchar);
   94 
   95 while ((t = *data++) != XCL_END)
   96   {
   97   int x, y;
   98   if (t == XCL_SINGLE)
   99     {
  100 #ifdef SUPPORT_UTF
  101     if (utf)
  102       {
  103       GETCHARINC(x, data); /* macro generates multiple statements */
  104       }
  105     else
  106 #endif
  107       x = *data++;
  108     if (c == x) return !negated;
  109     }
  110   else if (t == XCL_RANGE)
  111     {
  112 #ifdef SUPPORT_UTF
  113     if (utf)
  114       {
  115       GETCHARINC(x, data); /* macro generates multiple statements */
  116       GETCHARINC(y, data); /* macro generates multiple statements */
  117       }
  118     else
  119 #endif
  120       {
  121       x = *data++;
  122       y = *data++;
  123       }
  124     if (c >= x && c <= y) return !negated;
  125     }
  126 
  127 #ifdef SUPPORT_UCP
  128   else  /* XCL_PROP & XCL_NOTPROP */
  129     {
  130     const ucd_record *prop = GET_UCD(c);
  131 
  132     switch(*data)
  133       {
  134       case PT_ANY:
  135       if (t == XCL_PROP) return !negated;
  136       break;
  137 
  138       case PT_LAMP:
  139       if ((prop->chartype == ucp_Lu || prop->chartype == ucp_Ll ||
  140            prop->chartype == ucp_Lt) == (t == XCL_PROP)) return !negated;
  141       break;
  142 
  143       case PT_GC:
  144       if ((data[1] == PRIV(ucp_gentype)[prop->chartype]) == (t == XCL_PROP))
  145         return !negated;
  146       break;
  147 
  148       case PT_PC:
  149       if ((data[1] == prop->chartype) == (t == XCL_PROP)) return !negated;
  150       break;
  151 
  152       case PT_SC:
  153       if ((data[1] == prop->script) == (t == XCL_PROP)) return !negated;
  154       break;
  155 
  156       case PT_ALNUM:
  157       if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
  158            PRIV(ucp_gentype)[prop->chartype] == ucp_N) == (t == XCL_PROP))
  159         return !negated;
  160       break;
  161 
  162       case PT_SPACE:    /* Perl space */
  163       if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z ||
  164            c == CHAR_HT || c == CHAR_NL || c == CHAR_FF || c == CHAR_CR)
  165              == (t == XCL_PROP))
  166         return !negated;
  167       break;
  168 
  169       case PT_PXSPACE:  /* POSIX space */
  170       if ((PRIV(ucp_gentype)[prop->chartype] == ucp_Z ||
  171            c == CHAR_HT || c == CHAR_NL || c == CHAR_VT ||
  172            c == CHAR_FF || c == CHAR_CR) == (t == XCL_PROP))
  173         return !negated;
  174       break;
  175 
  176       case PT_WORD:
  177       if ((PRIV(ucp_gentype)[prop->chartype] == ucp_L ||
  178            PRIV(ucp_gentype)[prop->chartype] == ucp_N || c == CHAR_UNDERSCORE)
  179              == (t == XCL_PROP))
  180         return !negated;
  181       break;
  182 
  183       /* This should never occur, but compilers may mutter if there is no
  184       default. */
  185 
  186       default:
  187       return FALSE;
  188       }
  189 
  190     data += 2;
  191     }
  192 #endif  /* SUPPORT_UCP */
  193   }
  194 
  195 return negated;   /* char did not match */
  196 }
  197 
  198 /* End of pcre_xclass.c */