src/symbol.cc

   1 /**
   2  * cwc - a crossword compiler. Copyright 1999 Lars Christensen
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  17  * 02111-1307, USA.
  18  **/
  19
  20 #include <iostream.h>
  21
  22 #include "symbol.hh"
  23
  24 //////////////////////////////////////////////////////////////////////
  25 // class symbol
  26
  27 char symbol::alphabet[32];
  28 symbol symbol::alphindex[256];
  29
  30 int symbol::symballoc = 0;
  31 symbol symbol::outside;
  32 symbol symbol::none;
  33 symbol symbol::empty;
  34
  35 symbol symbol::symbolbit(symbolset ss) {
  36   symbol s;
  37   for (symbolset i=1,n=0; i; i<<=1,n++) {
  38     if (ss&i)
  39       s.symb = n;
  40   }
  41   return s;
  42 }
  43
  44 symbol symbol::alloc(char ch) {
  45   symbol s;
  46   if (symballoc >= 32) {
  47     for (int i=0; i<32;i++) cout << alphabet[i]; cout << endl;
  48     cout << ch << ' ' << int(ch) << endl;
  49     throw error("Too many symbols");
  50   }
  51
  52   s.symb = symballoc;
  53   symballoc++;
  54   alphabet[s.symb] = ch;
  55   alphindex[(unsigned char)ch].symb = s.symb;
  56   return s;
  57 }
  58
  59 void symbol::buildindex() {
  60   for (int i=0;i<32;i++)
  61     alphabet[i] = UNDEF;
  62   for (int i=0;i<256;i++)
  63     alphindex[i].symb = UNDEF;
  64   symballoc = 0;
  65   none = symbol::alloc('/');
  66   empty = symbol::alloc('+');
  67   outside = symbol::alloc(' ');
  68 }
  69
  70 symbol::symbol(char ch) {
  71   symb = alphindex[(unsigned char)ch].symb;
  72   if (symb == UNDEF)
  73     *this = symbol::alloc(ch);
  74 }
  75
  76 symbolset pickbit(symbolset &ss) {
  77   int a[32], n = 0;
  78   for (int i=1; i; i<<=1) {
  79     if (ss & i)
  80       a[n++] = i;
  81   }
  82   if (n==0) return 0;
  83   symbolset bit = a[rand()%n];
  84   ss &= ~bit;
  85   return bit;
  86 }
  87
  88 int wordlen(symbol *st) {
  89   int n = 0;
  90   while (st[n] != symbol::outside) n++;
  91   return n;
  92 }
  93
  94 ostream &operator <<(ostream &os, symbol *s) {
  95   while (*s != symbol::outside) {
  96     os << *s;
  97     s++;
  98   }
  99   return os;
 100 }
 101
 102 int numones(symbolset ss) {
 103   int n = 0;
 104   for (int i=1; i; i <<= 1) {
 105     if (ss&i)
 106       n++;
 107   }
 108   return n;
 109 }
 110
 111 int symbol::numalpha() {
 112   int n = 0;
 113   for (int i=0; i<32; i++)
 114     if (isalpha(alphabet[i]))
 115       n++;
 116   return n;
 117 }