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annotate examples/fc/fc5.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 FC5: 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 Event driven version of FC4B.
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9
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10
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11 Copyright 1993 Parsifal Software. All Rights Reserved.
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12
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13 This software is provided 'as-is', without any express or implied
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14 warranty. In no event will the authors be held liable for any damages
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15 arising from the use of this software.
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16
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17 Permission is granted to anyone to use this software for any purpose,
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18 including commercial applications, and to alter it and redistribute it
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19 freely, subject to the following restrictions:
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20
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21 1. The origin of this software must not be misrepresented; you must not
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22 claim that you wrote the original software. If you use this software
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23 in a product, an acknowledgment in the product documentation would be
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24 appreciated but is not required.
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25 2. Altered source versions must be plainly marked as such, and must not be
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26 misrepresented as being the original software.
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27 3. This notice may not be removed or altered from any source distribution.
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28 */
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29
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30 [
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31 test file mask = "*.fc4" // C1
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32 traditional engine /* turn this off for production use */ // C2
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33 default token type = double // C3
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34 disregard white space // C4
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35 lexeme {unsigned number, end of line} // C5
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36 event driven // C6
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37 ]
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38
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39 eof = -1
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40
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41 (void) grammar
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42 -> [temperature?, end of line]..., eof // P1
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43
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44 (void) temperature
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45 -> number:c, 'c' + 'C' ={ /* P2 */
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46 double f = 9*c/5 + 32;
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47 printf("%.6g\370F = %.6g\370C = %.6g\370K\n",f,c,c+zero);
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48 }
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49 -> number:f, 'f' + 'F' ={ /* P3 */
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50 double c = 5*(f-32)/9;
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51 printf("%.6g\370F = %.6g\370C = %.6g\370K\n",f,c,c+zero);
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52 }
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53 -> '+'?, unsigned number:k, 'k' + 'K' ={ /* P3a */
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54 double c = k - zero;
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55 double f = 9*c/5 + 32;
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56 printf("%.6g\370F = %.6g\370C = %.6g\370K\n", f, c, k);
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57 }
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58 -> error // P4
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59
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60 number
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61 -> '-', unsigned number:n =-n; // P5
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62 -> '+'?, unsigned number:n =n; // P6
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63
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64 unsigned number
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65 -> integer, '.'? // P6a
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66 -> integer:i, '.', fraction:f =i+f; // P6b
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67 -> '.', fraction:f =f; // P6c
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68
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69 integer
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70 -> '0-9':d =d-'0'; // P7
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71 -> integer:n, '0-9':d =10*n+d-'0'; // P8
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72
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73 fraction
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74 -> '0-9':d =(d-'0')/10.; // P9
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75 -> '0-9':d, fraction:f =(d-'0' + f)/10.; // P10
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76
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77 white space
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78 -> ' ' + '\t' // P11
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79 -> "/*", ~eof?..., "*/" // P12
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80
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81 end of line
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82 -> ["//", ~(eof + '\n')?...], '\n' // P13
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83
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84 { /* Embedded C */
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85
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86 #include <stdlib.h>
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87 #include <stdio.h>
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88
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89 const double zero = 273.16;
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90
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91 int main(void) {
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92 init_fc5(); /* Initialize parser */
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93 while (fc5_pcb.exit_flag == AG_RUNNING_CODE) { /* Until done */
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94 fc5_pcb.input_code = getchar(); /* Hand char to parser */
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95 fc5(); /* Process character */
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96 }
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97 return (fc5_pcb.exit_flag - AG_SUCCESS_CODE); /* Return error level */
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98 }
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99
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100 } // End of Embedded C