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annotate tests/agcl/ffcalc/ffcx.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 {/* FOUR FUNCTION CALCULATOR: FFCALCX.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 left { '+', '-'}
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9 left { '*', '/'}
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10 right {unary minus}
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11 ]
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12
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13 // -- FOUR FUNCTION CALCULATOR -------------------------
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14 (void) calculator $
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15 -> [calculation?, '\n']..., eof
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16
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17 (void) calculation
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18 -> expression:x =printf("%g\n",x);
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19 -> name:n, '=', expression:x ={
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20 printf("%c = %g\n",n+'A',value[n]=x);}
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21 -> error
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22
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23 expression
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24 -> name:n = value[n];
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25 -> real
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26 -> '(', expression:x, ')' = x;
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27 -> expression:x, '+', expression:t = x+t;
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28 -> expression:x, '-', expression:t = x-t;
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29 -> expression:t, '*', expression:f = t*f;
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30 -> expression:t, '/', expression:f = t/f;
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31 -> unary minus, expression:f = -f;
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32
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33 // -- LEXICAL UNITS ------------------------------------
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34 digit = '0-9'
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35 eof = -1
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36 unary minus = '-'
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37
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38 (void) white space
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39 -> ' ' + '\t' + '\r' + '\f' + '\v'
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40 -> "/*", ~eof?..., "*/"
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41
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42 (int) name
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43 -> 'a-z' + 'A-Z':c = c-'A';
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44
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45 real
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46 -> integer part:i, '.', fraction part:f = i+f;
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47 -> integer part, '.'?
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48 -> '.', fraction part:f = f;
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49
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50 integer part
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51 -> digit:d = d-'0';
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52 -> integer part:x, digit:d = 10*x + d-'0';
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53
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54 fraction part
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55 -> digit:d =(d-'0')/10.;
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56 -> digit:d, fraction part:f =(d-'0' + f)/10.;
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57
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58 { /* -- EMBEDDED C ---------------------------------- */
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59 double value[64]; /* registers */
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60 int main(void) {
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61 ffcalcx();
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62 return 0;
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63 }
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64 } /* -- END OF EMBEDDED C ----------------------------*/