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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 13d2b8934445
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 {/*
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2 FOUR FUNCTION CALCULATOR: FFCALC.SYN
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3 */
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4 #include "Number.h"
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5
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6 int Number::nCreated = 0;
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7 char Number::buf[100];
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8
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9 }
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10
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11 // -- CONFIGURATION SECTION ----------------------------
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12 [
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13 disregard white space
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14 lexeme { real}
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15 parser file name = "#.cpp"
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16 wrapper {Number}
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17 line numbers
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18 allow macros = OFF
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19 default token type = Number
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20 token names
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21 ]
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22
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23 // -- FOUR FUNCTION CALCULATOR -------------------------
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24 calculator $
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25 -> [calculation?, '\n']..., eof
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26
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27 calculation
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28 -> expression:x =printf("%s\n", x.asString());
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29 -> name:n, '=', expression:x ={
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30 printf("%c = %s\n",n+'A', (value[n]=x).asString());}
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31 -> error
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32
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33 (Number) expression
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34 -> term
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35 -> expression:x, '+', term:t = {
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36 printf("x = %s\n", x.asString());
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37 printf("t = %s\n", t.asString());
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38 x+=t;
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39 printf("x = %s\n", x.asString());
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40 return x;
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41 }
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42 -> expression:x, '-', term:t = x-=t;
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43
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44 (Number) term
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45 -> factor
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46 -> term:t, '*', factor:f = t*=f;
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47 -> term:t, '/', factor:f = t/=f;
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48
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49 (Number) factor
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50 -> name:n = value[n];
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51 -> real:x =Number(x);
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52 -> '(', expression:x, ')' = x;
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53 -> '-', factor:f = -f;
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54
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55 // -- LEXICAL UNITS ------------------------------------
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56 digit = '0-9'
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57 eof = -1
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58
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59 (void) white space
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60 -> ' ' + '\t' + '\r' + '\f' + '\v'
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61 -> "/*", ~eof?..., "*/"
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62
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63 (int) name
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64 -> 'a-z' + 'A-Z':c = c-'A';
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65
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66 (double) real
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67 -> integer part:i, '.', fraction part:f = i+f;
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68 -> integer part, '.'?
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69 -> '.', fraction part:f = f;
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70
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71 (double) integer part
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72 -> digit:d = d-'0';
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73 -> integer part:x, digit:d = 10*x + d-'0';
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74
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75 (double) fraction part
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76 -> digit:d =(d-'0')/10.;
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77 -> digit:d, fraction part:f =(d-'0' + f)/10.;
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78
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79 { /* -- EMBEDDED C ---------------------------------- */
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80
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81 #define SYNTAX_ERROR printf("%s, line %d, column %d\n", \
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82 (PCB).error_message, (PCB).line, (PCB).column)
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83
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84 Number value[64]; /* registers */
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85 int main(void) {
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86 ffcalc();
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87 return 0;
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88 }
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89 } /* -- END OF EMBEDDED C ----------------------------*/