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annotate examples/dsl/symbol.cpp @ 18:562c313f14f4

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some minor updates for 2022
author David A. Holland
date Tue, 31 May 2022 02:03:50 -0400
parents 13d2b8934445
children
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1 /*****
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2
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3 AnaGram Programming Examples
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4
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5 A Dos Script Language
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6 Symbol Table Definitions
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7
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8 Copyright 1993 Parsifal Software. All Rights Reserved.
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9
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10 This software is provided 'as-is', without any express or implied
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11 warranty. In no event will the authors be held liable for any damages
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12 arising from the use of this software.
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13
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14 Permission is granted to anyone to use this software for any purpose,
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15 including commercial applications, and to alter it and redistribute it
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16 freely, subject to the following restrictions:
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17
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18 1. The origin of this software must not be misrepresented; you must not
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19 claim that you wrote the original software. If you use this software
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20 in a product, an acknowledgment in the product documentation would be
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21 appreciated but is not required.
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22 2. Altered source versions must be plainly marked as such, and must not be
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23 misrepresented as being the original software.
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24 3. This notice may not be removed or altered from any source distribution.
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25
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26 *****/
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27
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28 #include "symbol.h"
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29 #include <strdict.h>
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30 #include <charsink.h>
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31 #include <ctype.h>
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32 #include "util.h"
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33
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34 extern string_accumulator sa;
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35 extern string_dictionary sd;
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36 extern unsigned stderr_index;
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37
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38 action_pointer copy_action(void);
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39
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40 void release(action_descriptor *d) {
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41 delete [] d->args;
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42 delete [] d->ap.pointer;
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43 delete d;
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44 }
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45
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46 void release(symbol_table_entry &s) {
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47 switch (s.type) {
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48 case string_type:
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49 case value_type: {
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50 delete [] s.data.text;
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51 break;
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52 }
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53 case action_type: {
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54 release(s.data.action);
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55 break;
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56 }
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57 default:
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58 /* not supposed to happen? */
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59 break;
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60 }
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61 s.data.integer = 0;
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62 }
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63
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64 void define_action(int n) {
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65 unsigned index;
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66 action_descriptor *d = new action_descriptor;
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67
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68 d->args = new unsigned[n];
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69 d->n_args = n;
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70 d->ap = copy_action();
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71 while (n--) {
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72 d->args[n] = sd << (sa--).top();
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73 }
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74 index = sd << (sa--).top();
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75 release(st[index]);
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76 st[index].type = action_type;
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77 st[index].data.action = d;
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78 }
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79
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80 void define_integer(const char *name, long value) {
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81 unsigned index = sd << name;
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82 release(st[index]);
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83 st[index].type = integer_type;
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84 st[index].data.integer = value;
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85 }
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86
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87 void define_string(void) {
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88 char *text = copy(sa--);
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89 unsigned index = sd << (sa--).top();
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90 release(st[index]);
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91 st[index].type = string_type;
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92 st[index].data.text = text;
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93 }
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94
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95 const char *dos_internals[] = {
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96 "CD",
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97 "CHCP",
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98 "CHDIR",
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99 "CLS",
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100 "COPY",
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101 "CTTY",
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102 "DATE",
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103 "DEL",
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104 "DIR",
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105 "ERASE",
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106 "MD",
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107 "MKDIR",
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108 "PATH",
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109 "PROMPT",
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110 "RD",
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111 "REN",
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112 "RENAME",
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113 "RMDIR",
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114 "SET",
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115 "TIME",
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116 "TYPE",
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117 "VER",
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118 "VERIFY",
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119 "VOL",
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120 "CHKDSK",
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121 "COMP",
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122 "DISKCOMP",
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123 "DISKCOPY",
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124 "KEYB",
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125 "LABEL",
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126 "MODE",
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127 "PRINT",
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128 "RECOVER",
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129 NULL,
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130 };
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131
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132 extern internal_commands_descriptor internal_commands[];
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133 extern struct built_ins_descriptor built_ins[];
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134 extern unsigned errorlevel_index;
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135
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136 void set_arg(int n, char *arg) {
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137 unsigned index;
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138 (++sa).printf("argv[%d]", n);
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139 index = sd << (sa--).top();
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140 st[index].type = string_type;
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141 st[index].data.text = arg;
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142 }
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143
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144
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145 void init_dos_internals(void) {
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146 int i;
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147 unsigned index;
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148 for (i = 0; dos_internals[i]; i++) {
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149 st[sd << dos_internals[i]].type = dos_type;
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150 }
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151 for (i = 0; internal_commands[i].name; i++) {
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152 index = sd << internal_commands[i].name;
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153 st[index].type = internal_type;
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154 st[index].data.proc = internal_commands[i].proc;
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155 }
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156 for (i = 0; built_ins[i].name; i++) {
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157 index = sd << built_ins[i].name;
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158 st[index].type = built_in_function_type;
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159 st[index].data.func = built_ins[i].proc;
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160 }
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161 define_integer("errorlevel", 0);
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162 errorlevel_index = sd["errorlevel"];
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163 index = stderr_index = sd << "stderr";
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164 st[index].type = string_type;
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165 st[index].data.text = NULL;
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166 }
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167