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Member "tin-2.4.1/pcre/pcre_ucp_searchfuncs.c" (28 Aug 2013, 6054 Bytes) of archive /linux/misc/tin-2.4.1.tar.gz:


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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) 1997-2006 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 code for searching the table of Unicode character
   42 properties. */
   43 
   44 #include "pcre_internal.h"
   45 
   46 #include "ucp.h"               /* Category definitions */
   47 #include "ucpinternal.h"       /* Internal table details */
   48 #include "ucptable.c"          /* The table itself */
   49 
   50 
   51 /* Table to translate from particular type value to the general value. */
   52 
   53 static int ucp_gentype[] = {
   54   ucp_C, ucp_C, ucp_C, ucp_C, ucp_C,  /* Cc, Cf, Cn, Co, Cs */
   55   ucp_L, ucp_L, ucp_L, ucp_L, ucp_L,  /* Ll, Lu, Lm, Lo, Lt */
   56   ucp_M, ucp_M, ucp_M,                /* Mc, Me, Mn */
   57   ucp_N, ucp_N, ucp_N,                /* Nd, Nl, No */
   58   ucp_P, ucp_P, ucp_P, ucp_P, ucp_P,  /* Pc, Pd, Pe, Pf, Pi */
   59   ucp_P, ucp_P,                       /* Ps, Po */
   60   ucp_S, ucp_S, ucp_S, ucp_S,         /* Sc, Sk, Sm, So */
   61   ucp_Z, ucp_Z, ucp_Z                 /* Zl, Zp, Zs */
   62 };
   63 
   64 
   65 
   66 /*************************************************
   67 *         Search table and return type           *
   68 *************************************************/
   69 
   70 /* Three values are returned: the category is ucp_C, ucp_L, etc. The detailed
   71 character type is ucp_Lu, ucp_Nd, etc. The script is ucp_Latin, etc.
   72 
   73 Arguments:
   74   c           the character value
   75   type_ptr    the detailed character type is returned here
   76   script_ptr  the script is returned here
   77 
   78 Returns:      the character type category
   79 */
   80 
   81 int
   82 _pcre_ucp_findprop(const unsigned int c, int *type_ptr, int *script_ptr)
   83 {
   84 int bot = 0;
   85 int top = sizeof(ucp_table)/sizeof(cnode);
   86 int mid;
   87 
   88 /* The table is searched using a binary chop. You might think that using
   89 intermediate variables to hold some of the common expressions would speed
   90 things up, but tests with gcc 3.4.4 on Linux showed that, on the contrary, it
   91 makes things a lot slower. */
   92 
   93 for (;;)
   94   {
   95   if (top <= bot)
   96     {
   97     *type_ptr = ucp_Cn;
   98     *script_ptr = ucp_Common;
   99     return ucp_C;
  100     }
  101   mid = (bot + top) >> 1;
  102   if (c == (ucp_table[mid].f0 & f0_charmask)) break;
  103   if (c < (ucp_table[mid].f0 & f0_charmask)) top = mid;
  104   else
  105     {
  106     if ((ucp_table[mid].f0 & f0_rangeflag) != 0 &&
  107         c <= (ucp_table[mid].f0 & f0_charmask) +
  108              (ucp_table[mid].f1 & f1_rangemask)) break;
  109     bot = mid + 1;
  110     }
  111   }
  112 
  113 /* Found an entry in the table. Set the script and detailed type values, and
  114 return the general type. */
  115 
  116 *script_ptr = (ucp_table[mid].f0 & f0_scriptmask) >> f0_scriptshift;
  117 *type_ptr = (ucp_table[mid].f1 & f1_typemask) >> f1_typeshift;
  118 
  119 return ucp_gentype[*type_ptr];
  120 }
  121 
  122 
  123 
  124 /*************************************************
  125 *       Search table and return other case       *
  126 *************************************************/
  127 
  128 /* If the given character is a letter, and there is another case for the
  129 letter, return the other case. Otherwise, return -1.
  130 
  131 Arguments:
  132   c           the character value
  133 
  134 Returns:      the other case or NOTACHAR if none
  135 */
  136 
  137 unsigned int
  138 _pcre_ucp_othercase(const unsigned int c)
  139 {
  140 int bot = 0;
  141 int top = sizeof(ucp_table)/sizeof(cnode);
  142 int mid, offset;
  143 
  144 /* The table is searched using a binary chop. You might think that using
  145 intermediate variables to hold some of the common expressions would speed
  146 things up, but tests with gcc 3.4.4 on Linux showed that, on the contrary, it
  147 makes things a lot slower. */
  148 
  149 for (;;)
  150   {
  151   if (top <= bot) return -1;
  152   mid = (bot + top) >> 1;
  153   if (c == (ucp_table[mid].f0 & f0_charmask)) break;
  154   if (c < (ucp_table[mid].f0 & f0_charmask)) top = mid;
  155   else
  156     {
  157     if ((ucp_table[mid].f0 & f0_rangeflag) != 0 &&
  158         c <= (ucp_table[mid].f0 & f0_charmask) +
  159              (ucp_table[mid].f1 & f1_rangemask)) break;
  160     bot = mid + 1;
  161     }
  162   }
  163 
  164 /* Found an entry in the table. Return NOTACHAR for a range entry. Otherwise
  165 return the other case if there is one, else NOTACHAR. */
  166 
  167 if ((ucp_table[mid].f0 & f0_rangeflag) != 0) return NOTACHAR;
  168 
  169 offset = ucp_table[mid].f1 & f1_casemask;
  170 if ((offset & f1_caseneg) != 0) offset |= f1_caseneg;
  171 return (offset == 0)? NOTACHAR : c + offset;
  172 }
  173 
  174 
  175 /* End of pcre_ucp_searchfuncs.c */