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annotate tests/agcl/oldagsrc/rcalc.syn @ 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 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