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annotate examples/fc/fc3.syn @ 4:bebb2ba69e1d

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maybe help with getting tex to fail properly on error
author David A. Holland
date Sat, 18 Apr 2020 17:12:17 -0400
parents 13d2b8934445
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