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annotate tests/agcl/ffcalc/ffc-t.syn @ 6:607e3be6bad8

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Adjust to the moving target called the C++ standard. Apparently nowadays it's not allowed to define an explicit copy constructor but not an assignment operator. Consequently, defining the explicit copy constructor in terms of the implicit/automatic assignment operator for general convenience no longer works. Add assignment operators. Caution: not tested with the IBM compiler, but there's no particular reason it shouldn't work.
author David A. Holland
date Mon, 30 May 2022 23:46:22 -0400
parents 13d2b8934445
children
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1 {/* FOUR FUNCTION CALCULATOR: FFCALC.SYN */}
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2
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3 // -- CONFIGURATION SECTION ----------------------------
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4 [
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5 default token type = double
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6 disregard white space
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7 lexeme { real}
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8 traditional engine
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9 ]
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10
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11 // -- FOUR FUNCTION CALCULATOR -------------------------
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12 (void) calculator $
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13 -> [calculation?, '\n']..., eof
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14
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15 (void) calculation
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16 -> expression:x =printf("%g\n",x);
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17 -> name:n, '=', expression:x ={
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18 printf("%c = %g\n",n+'A',value[n]=x);}
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19 -> error
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20
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21 expression
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22 -> term
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23 -> expression:x, '+', term:t = x+t;
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24 -> expression:x, '-', term:t = x-t;
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25
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26 term
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27 -> factor
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28 -> term:t, '*', factor:f = t*f;
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29 -> term:t, '/', factor:f = t/f;
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30
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31 factor
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32 -> name:n = value[n];
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33 -> real
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34 -> '(', expression:x, ')' = x;
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35 -> '-', factor:f = -f;
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36
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37 // -- LEXICAL UNITS ------------------------------------
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38 digit = '0-9'
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39 eof = -1
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40
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41 (void) white space
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42 -> ' ' + '\t' + '\r' + '\f' + '\v'
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43 -> "/*", ~eof?..., "*/"
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44
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45 (int) name
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46 -> 'a-z' + 'A-Z':c = c-'A';
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47
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48 real
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49 -> integer part:i, '.', fraction part:f = i+f;
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50 -> integer part, '.'?
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51 -> '.', fraction part:f = f;
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52
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53 integer part
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54 -> digit:d = d-'0';
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55 -> integer part:x, digit:d = 10*x + d-'0';
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56
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57 fraction part
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58 -> digit:d =(d-'0')/10.;
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59 -> digit:d, fraction part:f =(d-'0' + f)/10.;
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60
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61 { /* -- EMBEDDED C ---------------------------------- */
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62 double value[64]; /* registers */
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63 int main(void) {
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64 ffcalc();
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65 return 0;
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66 }
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67 } /* -- END OF EMBEDDED C ----------------------------*/