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annotate oldclasslib/source/strdict.cpp @ 24:a4899cdfc2d6 default tip

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Obfuscate the regexps to strip off the IBM compiler's copyright banners. I don't want bots scanning github to think they're real copyright notices because that could cause real problems.
author David A. Holland
date Mon, 13 Jun 2022 00:40:23 -0400
parents 607e3be6bad8
children
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1 /*
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2 * AnaGram, a System for Syntax Directed Parsing
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3 * String Dictionary Class Definition
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4 *
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5 * Copyright 1993 Parsifal Software. All Rights Reserved.
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6 *
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7 * This software is provided 'as-is', without any express or implied
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8 * warranty. In no event will the authors be held liable for any damages
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9 * arising from the use of this software.
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10 *
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11 * Permission is granted to anyone to use this software for any purpose,
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12 * including commercial applications, and to alter it and redistribute it
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13 * freely, subject to the following restrictions:
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14 *
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15 * 1. The origin of this software must not be misrepresented; you must not
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16 * claim that you wrote the original software. If you use this software
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17 * in a product, an acknowledgment in the product documentation would be
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18 * appreciated but is not required.
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19 * 2. Altered source versions must be plainly marked as such, and must not be
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20 * misrepresented as being the original software.
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21 * 3. This notice may not be removed or altered from any source distribution.
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22 */
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23
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24 #include "strdict.h"
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25 #include <assert.h>
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26 #include <string.h>
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27
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28
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29 // Constructor
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30
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31 string_dictionary::string_dictionary(unsigned size, unsigned wl) {
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32 assert((size << 1) > size);
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33 assert((long) size * wl < 65536L);
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34
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35 sxs = new unsigned[size]; // allocate index storage
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36 csxmax = wl*size; // calculate char storage rqmt
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37 cs = new char[csxmax]; // allocate character storage
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38 csx = 1; // can't use byte zero
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39 for (htl = 1; htl < size; htl <<= 1); // calculate size of hash table
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40 htmask = htl - 1; // htl is a power of two
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41 ht = new unsigned[htl]; // allocate storage for hash table
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42 memset(ht, 0, htl*sizeof(unsigned)); // init to zeros
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43 nsmax = size;
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44 ns = 1; // can't use zero
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45 n_calls = n_collisions = 0; // clear statistics
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46 copy_flag = 0; // live
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47 }
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48
6
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49 void string_dictionary::operator = (const string_dictionary &s) {
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50 sxs = s.sxs;
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51 cs = s.cs;
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52 csx = s.csx;
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53 csxmax = s.csxmax;
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54 ns = s.ns;
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55 nsmax = s.nsmax;
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56 ht = s.ht;
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57 htl = s.htl;
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58 htmask = s.htmask;
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59 n_calls = s.n_calls;
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60 n_collisions = s.n_collisions;
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61 copy_flag = s.copy_flag;
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62 }
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63
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64 string_dictionary::string_dictionary(const string_dictionary &s) {
0
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65 *this = s;
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66 copy_flag++; //memorex
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67 }
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68
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69
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70 // Reset Dictionary
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71
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72 string_dictionary &reset(string_dictionary &d) {
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73 assert(d.copy_flag == 0);
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74 d.csx = 1; // can't use byte zero
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75 memset(d.ht, 0, d.htl*sizeof(unsigned)); // init to zeros
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76 d.ns = 1; // can't use zero
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77 d.n_calls = d.n_collisions = 0; // reset statistics
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78 return d;
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79 }
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80
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81
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82 // Destructor
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83
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84 string_dictionary::~string_dictionary() {
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85 if (copy_flag) return;
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86 delete [] sxs;
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87 delete [] cs;
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88 delete [] ht;
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89 }
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90
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91
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92 // Hash Utility
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93
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94 unsigned string_dictionary::hash(const char *s) {
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95 unsigned char k1 = 1, k2 = 1;
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96 unsigned char c;
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97 unsigned hx; // hash index
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98 unsigned sx; // string index
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99 int k = 0;
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100 while((c = s[k++]) != 0) { // accumulate hash code elements
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101 if ((k1 += c) < c) k1++;
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102 if ((k2 += k1) < k1) k2++;
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103 }
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104 k1--;
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105 k2--;
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106 hx = (255*k1 + k2) & htmask; // calculate hash code
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107 sx = ht[hx];
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108 n_calls++; // count number of calls
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109 if (sx && strcmp(s, &cs[sxs[sx]])) {
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110 unsigned dx = (2*(255*k2 + k1) + 1) & htmask;
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111 do { // no cycles, since dx and htl are relatively prime
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112 n_collisions++; // count collisions
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113 sx = ht[hx = htmask & (hx+dx)];
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114 } while (sx && strcmp(s, &cs[sxs[sx]]));
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115 }
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116 return hx;
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117 }
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118
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119
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120 // Recover String
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121
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122 unsigned string_dictionary::operator [] (const char *s) {
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123 return ht[hash(s)];
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124 }
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125
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126
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127 // Enter String in Dictionary
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128
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129 unsigned string_dictionary::operator << (const char *s) {
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130 unsigned hx = hash(s); // get hash code
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131 unsigned k;
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132 if (ht[hx]) return ht[hx]; // return index if already there
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133 assert(copy_flag == 0);
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134 assert (ns < nsmax); // make sure table's not full
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135 if (s) k = strlen(s) + 1; // get string length
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136 else k = 1;
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137 assert(csx + k < csxmax); // make sure there's room
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138 strcpy(&cs[csx],s); // save string
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139 sxs[ns] = csx; // save string index
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140 csx += k; // advance storage index
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141 return ht[hx] = ns++; // return index
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142 }
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143
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144
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145 // Look up String in Dictionary
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146
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147 char *string_dictionary::operator [] (unsigned sx) {
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148 if (sx && sx <= ns) return &cs[sxs[sx]];
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149 return 0;
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150 }
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151
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152
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153 // Find Number of Entries in Dictionary
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154
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155 unsigned size(string_dictionary &sd) {
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156 return sd.ns - 1;
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157 }