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annotate tests/agcl/ffcalc/ffcs-t.syn @ 2:4b08ee1ecb99

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Adjust install notes to clarify that Wine applies only to the Windows build. (Thanks to Perry Metzger for test-driving.)
author David A. Holland
date Sun, 26 Apr 2009 17:58:26 -0400
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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 | '(', expression:x, ')' = x; | '-', factor:f = -f;
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34
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35 // -- LEXICAL UNITS ------------------------------------
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36 digit = '0-9'
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37 eof = -1
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38
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39 (void) white space
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40 -> ' ' + '\t' + '\r' + '\f' + '\v'
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41 -> "/*", ~eof?..., "*/"
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42
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43 (int) name
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44 -> 'a-z' + 'A-Z':c = c-'A';
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45
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46 real
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47 -> integer part:i, '.', fraction part:f = i+f; | integer part, '.'? | '.', fraction part:f = f;
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48
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49 integer part
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50 -> digit:d = d-'0';
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51 -> integer part:x, digit:d = 10*x + d-'0';
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52
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53 fraction part
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54 -> digit:d =(d-'0')/10.;
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55 -> digit:d, fraction part:f =(d-'0' + f)/10.;
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56
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57 { /* -- EMBEDDED C ---------------------------------- */
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58 double value[64]; /* registers */
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59 void main(void) {
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60 ffcalc();
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61 }
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62 } // -- END OF EMBEDDED C ------------------------------