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annotate examples/fc/fc4b.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 FC4B: Multiple Fahrenheit-Celsius conversion with signed numbers,
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4 floating point arithmetic, optional white space, and Kelvin
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5 temperature input.
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6
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7 This grammar resolves the conflicts found in FC4.
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8
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9
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10 Copyright 1993 Parsifal Software. All Rights Reserved.
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11
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12 This software is provided 'as-is', without any express or implied
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13 warranty. In no event will the authors be held liable for any damages
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14 arising from the use of this software.
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15
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16 Permission is granted to anyone to use this software for any purpose,
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17 including commercial applications, and to alter it and redistribute it
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18 freely, subject to the following restrictions:
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19
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20 1. The origin of this software must not be misrepresented; you must not
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21 claim that you wrote the original software. If you use this software
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22 in a product, an acknowledgment in the product documentation would be
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23 appreciated but is not required.
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24 2. Altered source versions must be plainly marked as such, and must not be
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25 misrepresented as being the original software.
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26 3. This notice may not be removed or altered from any source distribution.
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27 */
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28
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29 [
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30 test file mask = "*.fc4" // C1
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31 traditional engine /* turn this off for production use */ // C2
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32 default token type = double // C3
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33 disregard white space // C4
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34 lexeme {unsigned number, end of line} // C5
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35 ]
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36
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37 eof = -1
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38
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39 (void) grammar
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40 -> [temperature?, end of line]..., eof // P1
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41
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42 (void) temperature
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43 -> number:c, 'c' + 'C' ={ /* P2 */
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44 double f = 9*c/5 + 32;
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45 printf("%.6g\370F = %.6g\370C = %.6g\370K\n",f,c,c+273.16);
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46 }
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47 -> number:f, 'f' + 'F' = { /* P3 */
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48 double c = 5*(f-32)/9;
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49 printf("%.6g\370F = %.6g\370C = %.6g\370K\n",f,c,c+273.16);
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50 }
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51 -> '+'?, unsigned number:k, 'k' + 'K' ={ /* P3a */
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52 double c = k - 273.16;
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53 double f = 9*c/5 + 32;
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54 printf("%.6g\370F = %.6g\370C = %.6g\370K\n", f, c, k);
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55 }
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56 -> error // P4
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57
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58 number
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59 -> '-', unsigned number:n =-n; // P5
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60 -> '+'?, unsigned number:n =n; // P6
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61
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62 unsigned number
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63 -> integer, '.'? // P6a
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64 -> integer:i, '.', fraction:f =i+f; // P6b
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65 -> '.', fraction:f =f; // P6c
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66
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67 integer
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68 -> '0-9':d =d-'0'; // P7
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69 -> integer:n, '0-9':d =10*n+d-'0'; // P8
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70
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71 fraction
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72 -> '0-9':d =(d-'0')/10.; // P9
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73 -> '0-9':d, fraction:f =(d-'0' + f)/10.; // P10
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74
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75 white space
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76 -> ' ' + '\t' // P11
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77 -> "/*", ~eof?..., "*/" // P12
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78
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79 end of line
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80 -> ["//", ~(eof + '\n')?...], '\n' // P13