commands/flex-2.5.4/ccl.c

   1 /* ccl - routines for character classes */
   2
   3 /*-
   4  * Copyright (c) 1990 The Regents of the University of California.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Vern Paxson.
   9  *
  10  * The United States Government has rights in this work pursuant
  11  * to contract no. DE-AC03-76SF00098 between the United States
  12  * Department of Energy and the University of California.
  13  *
  14  * Redistribution and use in source and binary forms with or without
  15  * modification are permitted provided that: (1) source distributions retain
  16  * this entire copyright notice and comment, and (2) distributions including
  17  * binaries display the following acknowledgement:  ``This product includes
  18  * software developed by the University of California, Berkeley and its
  19  * contributors'' in the documentation or other materials provided with the
  20  * distribution and in all advertising materials mentioning features or use
  21  * of this software.  Neither the name of the University nor the names of
  22  * its contributors may be used to endorse or promote products derived from
  23  * this software without specific prior written permission.
  24  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  25  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  26  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  27  */
  28
  29 /* $Header$ */
  30
  31 #include "flexdef.h"
  32
  33 /* ccladd - add a single character to a ccl */
  34
  35 void ccladd( cclp, ch )
  36 int cclp;
  37 int ch;
  38         {
  39         int ind, len, newpos, i;
  40
  41         check_char( ch );
  42
  43         len = ccllen[cclp];
  44         ind = cclmap[cclp];
  45
  46         /* check to see if the character is already in the ccl */
  47
  48         for ( i = 0; i < len; ++i )
  49                 if ( ccltbl[ind + i] == ch )
  50                         return;
  51
  52         newpos = ind + len;
  53
  54         if ( newpos >= current_max_ccl_tbl_size )
  55                 {
  56                 current_max_ccl_tbl_size += MAX_CCL_TBL_SIZE_INCREMENT;
  57
  58                 ++num_reallocs;
  59
  60                 ccltbl = reallocate_Character_array( ccltbl,
  61                                                 current_max_ccl_tbl_size );
  62                 }
  63
  64         ccllen[cclp] = len + 1;
  65         ccltbl[newpos] = ch;
  66         }
  67
  68
  69 /* cclinit - return an empty ccl */
  70
  71 int cclinit()
  72         {
  73         if ( ++lastccl >= current_maxccls )
  74                 {
  75                 current_maxccls += MAX_CCLS_INCREMENT;
  76
  77                 ++num_reallocs;
  78
  79                 cclmap = reallocate_integer_array( cclmap, current_maxccls );
  80                 ccllen = reallocate_integer_array( ccllen, current_maxccls );
  81                 cclng = reallocate_integer_array( cclng, current_maxccls );
  82                 }
  83
  84         if ( lastccl == 1 )
  85                 /* we're making the first ccl */
  86                 cclmap[lastccl] = 0;
  87
  88         else
  89                 /* The new pointer is just past the end of the last ccl.
  90                  * Since the cclmap points to the \first/ character of a
  91                  * ccl, adding the length of the ccl to the cclmap pointer
  92                  * will produce a cursor to the first free space.
  93                  */
  94                 cclmap[lastccl] = cclmap[lastccl - 1] + ccllen[lastccl - 1];
  95
  96         ccllen[lastccl] = 0;
  97         cclng[lastccl] = 0;     /* ccl's start out life un-negated */
  98
  99         return lastccl;
 100         }
 101
 102
 103 /* cclnegate - negate the given ccl */
 104
 105 void cclnegate( cclp )
 106 int cclp;
 107         {
 108         cclng[cclp] = 1;
 109         }
 110
 111
 112 /* list_character_set - list the members of a set of characters in CCL form
 113  *
 114  * Writes to the given file a character-class representation of those
 115  * characters present in the given CCL.  A character is present if it
 116  * has a non-zero value in the cset array.
 117  */
 118
 119 void list_character_set( file, cset )
 120 FILE *file;
 121 int cset[];
 122         {
 123         register int i;
 124
 125         putc( '[', file );
 126
 127         for ( i = 0; i < csize; ++i )
 128                 {
 129                 if ( cset[i] )
 130                         {
 131                         register int start_char = i;
 132
 133                         putc( ' ', file );
 134
 135                         fputs( readable_form( i ), file );
 136
 137                         while ( ++i < csize && cset[i] )
 138                                 ;
 139
 140                         if ( i - 1 > start_char )
 141                                 /* this was a run */
 142                                 fprintf( file, "-%s", readable_form( i - 1 ) );
 143
 144                         putc( ' ', file );
 145                         }
 146                 }
 147
 148         putc( ']', file );
 149         }