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annotate examples/fc/fc3.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
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children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 AnaGram Programming Examples
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3 FC3: Multiple Fahrenheit-Celsius conversion with signed numbers,
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4 floating point arithmetic, and optional white space.
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5
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6
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7 Copyright 1993 Parsifal Software. All Rights Reserved.
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8
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9 This software is provided 'as-is', without any express or implied
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10 warranty. In no event will the authors be held liable for any damages
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11 arising from the use of this software.
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12
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13 Permission is granted to anyone to use this software for any purpose,
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14 including commercial applications, and to alter it and redistribute it
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15 freely, subject to the following restrictions:
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16
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17 1. The origin of this software must not be misrepresented; you must not
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18 claim that you wrote the original software. If you use this software
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19 in a product, an acknowledgment in the product documentation would be
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20 appreciated but is not required.
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21 2. Altered source versions must be plainly marked as such, and must not be
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22 misrepresented as being the original software.
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23 3. This notice may not be removed or altered from any source distribution.
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24 */
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25
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26 [
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27 test file mask = "*.fc3" // C1
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28 traditional engine /* turn this off for production use */ // C2
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29 default token type = double // C3
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30 disregard white space // C4
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31 lexeme {unsigned number, end of line} // C5
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32 ]
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33
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34 eof = -1
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35
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36 (void) grammar
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37 -> [temperature?, end of line]..., eof // P1
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38
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39 (void) temperature
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40 -> number:c, 'c' + 'C' ={ /* P2 */
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41 double f = 9*c/5 + 32;
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42 printf("%.6g\370F = %.6g\370C = %.6g\370K\n",f,c,c+273.16);
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43 }
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44 -> number:f, 'f' + 'F' ={ /* P3 */
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45 double c = 5*(f-32)/9;
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46 printf("%.6g\370F = %.6g\370C = %.6g\370K\n",f,c,c+273.16);
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47 }
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48 -> error // P4
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49
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50 number
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51 -> '-', unsigned number:n =-n; // P5
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52 -> '+'?, unsigned number:n =n; // P6
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53
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54 unsigned number
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55 -> integer, '.'? // P6a
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56 -> integer:i, '.', fraction:f =i+f; // P6b
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57 -> '.', fraction:f =f; // P6c
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58
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59 integer
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60 -> '0-9':d =d-'0'; // P7
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61 -> integer:n, '0-9':d =10*n+d-'0'; // P8
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62
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63 fraction
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64 -> '0-9':d =(d-'0')/10.; // P9
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65 -> '0-9':d, fraction:f =(d-'0' + f)/10.; // P10
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66
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67 white space
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68 -> ' ' + '\t' // P11
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69 -> "/*", ~eof?..., "*/" // P12
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70
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71 end of line
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72 -> ["//", ~(eof + '\n')?...], '\n' // P13