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annotate tests/agcl/oldagsrc/rcalcx.syn @ 0:13d2b8934445

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Import AnaGram (near-)release tree into Mercurial.
author David A. Holland
date Sat, 22 Dec 2007 17:52:45 -0500
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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 =PCB.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 : PCB.divide_error(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 #define PCB_TYPE Parser
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121
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122 class Parser : public rcalcx_pcb_type {
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123 int semantic_error;
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124 public:
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125 Parser() {}
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126 void parse(char *);
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127 void syntax_error();
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128 int divide_error(int cn);
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129 void print_roman(long k);
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130 };
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131
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132
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133 void Parser::parse(char *text) {
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134 pointer = (unsigned char *) text;
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135 semantic_error = 0;
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136 rcalcx(this);
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137 }
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138
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139 /* Macro Definitions */
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140
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141 #define GET_CONTEXT CONTEXT = PCB.column
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142 #define SYNTAX_ERROR PCB.syntax_error()
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143
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144 /*
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145
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146 syntax_error() positions a '^' character under the input line at the
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147 point where the syntax error was discovered and then writes the error
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148 message.
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149
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150 */
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151
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152 void Parser::syntax_error() {
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153 int k = column;
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154 while (k-- > 0) putchar(' ');
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155 printf("^? %s\n","ERRARE HUMANUM EST\n");
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156 }
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157
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158
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159 /*
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160
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161 divide_error() is called when an attempt is made to divide by zero. The
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162 entire divisor is marked with '^' characters. "semantic_error" is set
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163 in order to disable printing of a result.
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164
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165 */
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166
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167 int Parser::divide_error(int cn) {
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168 int k = column - cn;
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169 while (cn--) putchar(' ');
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170 while (k--) putchar('^');
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171 puts(" DIVISOR NIHIL EST");
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172 semantic_error = 1;
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173 return 0;
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174 }
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175
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176
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177 /*
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178
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179 print_roman() prints a signed integer in upper case Roman numerals.
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180
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181 */
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182
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183 void Parser::print_roman(long k) {
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184 if (semantic_error) {
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185 semantic_error = 0;
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186 return;
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187 }
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188 printf(" = ");
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189 if (k == 0) {printf("NIHIL\n"); return;}
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190
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191 if (k < 0) putchar('-'), k=-k;
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192
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193 while (k >= 1000) putchar('M'), k-=1000;
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194
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195 if (k >= 900) printf("CM"), k-=900;
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196 if (k >= 500) putchar('D'), k-=500;
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197 if (k >= 400) printf("CD"), k-=400;
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198
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199 while (k >= 100) putchar('C'), k-=100;
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200
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201 if (k >= 90) printf("XC"), k-=90;
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202 if (k >= 50) putchar('L'), k-=50;
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203 if (k >= 40) printf("XL"), k-=40;
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204
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205 while (k >= 10) putchar('X'), k-=10;
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206
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207 if (k >= 9) printf("IX"), k -= 9;
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208 if (k >= 5) putchar('V'), k-=5;
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209 if (k >= 4) printf("IV"), k-=4;
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210
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211 while (k >= 1) putchar('I'), k--;
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212
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213 putchar('\n');
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214 }
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215
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216
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217 /* Main Program -- reads a line from stdin and calls parser */
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218
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219 int main(void) {
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220 char line[82];
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221 while (1) {
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222 Parser pcb;
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223 printf("#");
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224 if (gets(line) == NULL) break;
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225 pcb.parse(line);
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226 }
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227 return 0;
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228 }
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229
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230 } // End of Embedded C