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annotate examples/ffcalc/ffcalc.syn @ 12:aab9ff6af791

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Strengthen the build hack for non-DOS targets.
author David A. Holland
date Tue, 31 May 2022 00:58:42 -0400
parents 13d2b8934445
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 ]
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9
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10 // -- FOUR FUNCTION CALCULATOR -------------------------
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11 (void) calculator $
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12 -> [calculation?, '\n']..., eof
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13
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14 (void) calculation
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15 -> expression:x =printf("%g\n",x);
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16 -> name:n, '=', expression:x ={
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17 printf("%c = %g\n",n+'A',value[n]=x);}
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18 -> error
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19
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20 expression
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21 -> term
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22 -> expression:x, '+', term:t = x+t;
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23 -> expression:x, '-', term:t = x-t;
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24
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25 term
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26 -> factor
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27 -> term:t, '*', factor:f = t*f;
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28 -> term:t, '/', factor:f = t/f;
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29
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30 factor
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31 -> name:n = value[n];
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32 -> real
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33 -> '(', expression:x, ')' = x;
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34 -> '-', factor:f = -f;
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35
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36 // -- LEXICAL UNITS ------------------------------------
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37 digit = '0-9'
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38 eof = -1
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39
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40 (void) white space
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41 -> ' ' + '\t' + '\r' + '\f' + '\v'
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42 -> "/*", ~eof?..., "*/"
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43
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44 (int) name
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45 -> 'a-z' + 'A-Z':c = c-'A';
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46
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47 real
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48 -> integer part:i, '.', fraction part:f = i+f;
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49 -> integer part, '.'?
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50 -> '.', fraction part:f = f;
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51
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52 integer part
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53 -> digit:d = d-'0';
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54 -> integer part:x, digit:d = 10*x + d-'0';
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55
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56 fraction part
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57 -> digit:d =(d-'0')/10.;
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58 -> digit:d, fraction part:f =(d-'0' + f)/10.;
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59
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60 { /* -- EMBEDDED C ---------------------------------- */
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61 double value[64]; /* registers */
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62 int main(void) {
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63 ffcalc();
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64 return 0;
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65 }
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66 } /* -- END OF EMBEDDED C ----------------------------*/