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annotate anagram/support/bitmap.cpp @ 21:1c9dac05d040

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Add lint-style FALLTHROUGH annotations to fallthrough cases. (in the parse engine and thus the output code) Document this, because the old output causes warnings with gcc10.
author David A. Holland
date Mon, 13 Jun 2022 00:04:38 -0400
parents 13d2b8934445
children
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1 /*
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2 * AnaGram, A System for Syntax Directed Programming
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3 * Copyright 1993-2000 Parsifal Software. All Rights Reserved.
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4 * See the file COPYING for license and usage terms.
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5 *
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6 * bitmap.cpp
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7 */
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8
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9 #include "assert.h"
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10 #include "bitmap.h"
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11
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12 //#define INCLUDE_LOGGING
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13 #include "log.h"
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14
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15
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16 void CharBitmap::blurCase(int x) {
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17 assert((unsigned) x < nBits);
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18 unsigned mask = 1 << (x%8);
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19 int index = x/8;
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20 int truthValue = (map[index] | map[index ^ 4]) & mask;
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21 map[index] |= (unsigned char) truthValue;
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22 map[index ^ 4] |= (unsigned char) truthValue;
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23 }
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24
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25 void CharBitmap::blurCase() {
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26 LOGSECTION("CharBitmap::blurCase()");
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27 int i;
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28 for (i = 'A'; i <= 'Z'; i++) {
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29 blurCase(i);
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30 }
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31 for (i = 0xc0; i <= 0xde; i++) {
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32 if (i != 0xd7) {
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33 blurCase(i);
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34 }
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35 }
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36 LOGS("blurCase complete");
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37 }
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38
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39
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40 int Bitmap::setBit(int x) {
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41 LOGSECTION("Bitmap::setBit");
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42 LOGV(x) LCV(nBits);
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43 assert((unsigned) x < nBits);
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44 unsigned mask = 1 << (x %8);
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45 int truthValue = (map[x/8] & mask) != 0;
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46 map[x/8] |= (unsigned char) mask;
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47 return truthValue;
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48 }
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49
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50 int CharBitmap::setBit(int x) {
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51 return Bitmap::setBit(x - min_char_number);
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52 }
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53
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54 int Bitmap::getBit(int x) {
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55 assert((unsigned) x < nBits);
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56 return (map[x/8] & (1 << (x % 8))) != 0;
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57 }
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58
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59 int CharBitmap::getBit(int x) {
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60 return Bitmap::getBit(x - min_char_number);
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61 }
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62
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63 int Bitmap::list(int *x) {
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64 LOGSECTION("Bitmap::list");
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65 unsigned char *p = (unsigned char *) map;
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66 unsigned i;
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67 int count = 0;
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68 for (i = 0; i < nBits; i++) {
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69 if ((p[i/8] & (1 << (i % 8))) == 0) {
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70 continue;
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71 }
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72 x[count++] = i;
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73 }
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74 return count;
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75 }
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76
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77 int CharBitmap::list(int *x) {
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78 int count = Bitmap::list(x);
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79 for (int i = 0; i < count; i++) {
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80 x[i] += min_char_number;
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81 }
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82 return count;
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83 }
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84
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85 Bitmap &Bitmap::setRange(unsigned first, unsigned last) {
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86 LOGSECTION("Bitmap::setRange");
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87 LOGV(first) LCV(last);
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88 assert(first <= last && last < nBits);
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89 int n = last/8;
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90 unsigned char bit = (unsigned char) (1 << (last %8));
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91 LOGV(n) LCV(bit);
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92 while (bit && first <= last) {
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93 map[n] |= bit;
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94 bit >>= 1;
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95 last--;
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96 }
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97 LOGV(bit) LCV(last);
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98 int x = first/8;
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99 bit = (unsigned char) (1 << (first % 8));
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100 LOGV(x) LCV(bit);
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101 while (bit && first <= last) {
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102 map[x] |= bit;
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103 bit <<= 1;
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104 first++;
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105 }
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106 LOGV(x) LCV(bit);
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107 x++;
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108 while (x < n) {
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109 map[x++] = 0xff;
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110 }
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111 return *this;
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112 }
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113
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114 #ifdef _MSC_VER
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115 Bitmap &CharBitmap::setRange(unsigned first, unsigned last) {
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116 #else
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117 CharBitmap &CharBitmap::setRange(unsigned first, unsigned last) {
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118 #endif
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119 LOGSECTION("CharBitmap::setRange");
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120 LOGV(first) LCV(last);
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121 Bitmap::setRange(first - min_char_number, last - min_char_number);
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122 return *this;
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123 }
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124
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125 Bitmap &Bitmap::operator |= (const Bitmap &b) {
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126 assert(nChars == b.nChars);
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127 int x = nChars;
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128 while (x--) {
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129 map[x] |= b.map[x];
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130 }
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131 return *this;
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132 }
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133
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134 Bitmap &Bitmap::operator &= (const Bitmap &b) {
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135 assert(nChars == b.nChars);
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136 int x = nChars;
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137 while (x--) {
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138 map[x] &= b.map[x];
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139 }
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140 return *this;
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141 }
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142
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143 Bitmap &Bitmap::operator -= (const Bitmap &b) {
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144 LOGSECTION("CharBitmap::operator -=");
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145 LOGV(nChars) LCV(b.nChars);
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146 assert(nChars == b.nChars);
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147 int x = nChars;
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148 while (x--) {
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149 map[x] &= (unsigned char) ~b.map[x];
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150 }
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151 return *this;
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152 }
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153
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154 Bitmap &Bitmap::operator ~() {
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155 int x = nChars;
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156 while (x--) {
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157 map[x] = (unsigned char) ~map[x];
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158 }
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159 return *this;
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160 }
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161