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annotate tests/agcl/oldagsrc/rcalc.syn @ 10:5b21f127e957

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silence random gcc warning
author David A. Holland
date Mon, 30 May 2022 23:58:14 -0400
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1 {/*
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2 AnaGram, a System for Syntax Directed Parsing
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3 RCALC.SYN: A Roman Numeral Calculator Example
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4
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5 Copyright (c) MCMXCIII, MCMXCVI, Parsifal Software.
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6 All Rights Reserved.
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7 */}
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8
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9 c = 'c'
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10 d = 'd'
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11 i = 'i'
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12 l = 'l'
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13 m = 'm'
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14 v = 'v'
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15 x = 'x'
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16
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17 eof = 0 // Input is a string
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18
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19 ws = ' ' + '\t' // Blanks and tabs
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20
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21 [
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22 ~allow macros // Simplify debugging
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23 disregard ws // Ignore blanks and tabs
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24 lexeme { roman numeral} // No blanks inside a number
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25 ~case sensitive // Allow upper/lower input
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26 context type = int // Track context
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27 default token type = long // All arithmetic uses longs
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28 pointer input // Input is array in memory
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29 reentrant parser
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30 parser file name = "#.cpp"
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31 ]
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32
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33
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34 // Grammar definition
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35
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36 (void) calculation $
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37 -> expression:x, eof =print_roman(x);
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38
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39
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40 // Expression logic
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41
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42 expression
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43 -> term // Value of expression is value of term
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44 -> expression:x, '+', term:y =x+y;
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45 -> expression:x, '-', term:y =x-y;
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46
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47 term
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48 -> factor // Value of term is value of factor
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49 -> term:x, '*', factor:y =x*y;
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50 -> term:x, '/', factor:y =y ? x/y : divide_error(pcb_pointer, RULE_CONTEXT[2]);
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51
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52 factor
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53 -> roman numeral // Value of factor is value of roman numeral
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54 -> "nihil" =0;
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55 -> '(', expression:x, ')' =x;
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56 -> '-', factor:x =-x;
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57
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58
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59 // Roman Numeral Syntax
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60
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61 roman numeral
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62 -> thousands:x, hundreds:y =x+y;
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63 -> thousands
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64 -> hundreds // Value of roman numeral is value of hundreds
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65
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66 thousands
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67 -> m =1000;
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68 -> thousands:x, m =x+1000;
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69
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70 hundreds
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71 -> hundreds field:x, tens:y =x+y;
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72 -> hundreds field
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73 -> tens // Value of hundreds is value of tens
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74
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75 hundreds field
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76 -> c, m =900;
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77 -> c, d =400;
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78 -> count hundreds
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79
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80 count hundreds
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81 -> c =100;
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82 -> d =500;
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83 -> count hundreds:x, c =x+100;
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84
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85 tens
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86 -> tens field:x, units:y =x+y;
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87 -> tens field
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88 -> units // Value of tens is value of units
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89
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90 tens field
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91 -> x, m =990;
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92 -> x, d =490;
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93 -> x, c =90;
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94 -> x, l =40;
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95 -> count tens
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96
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97 count tens
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98 -> x =10;
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99 -> l =50;
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100 -> count tens:x, x =x+10;
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101
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102 units
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103 -> i, m =999;
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104 -> i, d =499;
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105 -> i, c =99;
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106 -> i, l =49;
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107 -> i, x =9;
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108 -> i, v =4;
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109 -> count units // Value of "units" is value of "count units"
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110
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111 count units
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112 -> i =1;
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113 -> v =5;
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114 -> count units:x, i =x+1;
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115
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116
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117 { /* Embedded C */
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118 #include <stdio.h>
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119
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120
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121 /* Macro Definitions */
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122
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123 #define GET_CONTEXT CONTEXT = PCB.column
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124 #define SYNTAX_ERROR syntax_error(pcb_pointer)
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125
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126 int semantic_error = 0; /* Divide by zero flag */
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127
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128
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129 /*
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130
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131 syntax_error() positions a '^' character under the input line at the
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132 point where the syntax error was discovered and then writes the error
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133 message.
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134
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135 */
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136
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137 void syntax_error(PCB_DECL) {
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138 int k = PCB.column;
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139 while (k-- > 0) putchar(' ');
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140 printf("^? %s\n","ERRARE HUMANUM EST\n");
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141 }
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142
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143
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144 /*
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145
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146 divide_error() is called when an attempt is made to divide by zero. The
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147 entire divisor is marked with '^' characters. "semantic_error" is set
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148 in order to disable printing of a result.
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149
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150 */
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151
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152 int divide_error(PCB_DECL, int cn) {
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153 int k = PCB.column - cn;
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154 while (cn--) putchar(' ');
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155 while (k--) putchar('^');
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156 puts(" DIVISOR NIHIL EST");
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157 semantic_error = 1;
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158 return 0;
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159 }
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160
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161
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162 /*
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163
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164 print_roman() prints a signed integer in upper case Roman numerals.
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165
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166 */
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167
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168 void print_roman(long k) {
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169 if (semantic_error) {
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170 semantic_error = 0;
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171 return;
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172 }
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173 printf(" = ");
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174 if (k == 0) {printf("NIHIL\n"); return;}
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175
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176 if (k < 0) putchar('-'), k=-k;
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177
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178 while (k >= 1000) putchar('M'), k-=1000;
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179
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180 if (k >= 900) printf("CM"), k-=900;
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181 if (k >= 500) putchar('D'), k-=500;
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182 if (k >= 400) printf("CD"), k-=400;
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183
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184 while (k >= 100) putchar('C'), k-=100;
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185
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186 if (k >= 90) printf("XC"), k-=90;
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187 if (k >= 50) putchar('L'), k-=50;
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188 if (k >= 40) printf("XL"), k-=40;
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189
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190 while (k >= 10) putchar('X'), k-=10;
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191
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192 if (k >= 9) printf("IX"), k -= 9;
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193 if (k >= 5) putchar('V'), k-=5;
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194 if (k >= 4) printf("IV"), k-=4;
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195
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196 while (k >= 1) putchar('I'), k--;
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197
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198 putchar('\n');
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199 }
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200
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201
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202 /* Main Program -- reads a line from stdin and calls parser */
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203
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204 int main(void) {
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205 char line[82];
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206 while (1) {
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207 PCB_TYPE pcb;
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208 printf("#");
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209 if (gets(line) == NULL) break;
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210 pcb.pointer = (unsigned char *) line;
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211 rcalc(&pcb);
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212 }
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213 return 0;
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214 }
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215
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216 } // End of Embedded C