Last change
on this file was
3ac5fd8,
checked in by Peter A. Buhr <pabuhr@…>, 7 weeks ago
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first attempt changing end-of-file to an exception
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-
Property mode set to
100644
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File size:
1.5 KB
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1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2017 University of Waterloo |
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3 | // |
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4 | // The contents of this file are covered under the licence agreement in the |
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5 | // file "LICENCE" distributed with Cforall. |
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6 | // |
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7 | // cntparens.cfa -- match left/right parenthesis |
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8 | // |
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9 | // Author : Peter A. Buhr |
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10 | // Created On : Sat Apr 20 11:04:45 2019 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Last Modified On : Thu Aug 15 20:39:34 2024 |
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13 | // Update Count : 2 |
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14 | // |
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15 | |
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16 | #include <fstream.hfa> |
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17 | #include <coroutine.hfa> |
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18 | |
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19 | enum Status { Cont, Match, Error }; |
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20 | coroutine CntParens { |
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21 | char ch; // used for communication |
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22 | Status status; |
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23 | unsigned int cnt; |
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24 | }; // CntParens |
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25 | |
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26 | void main( CntParens & cpns ) with( cpns ) { |
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27 | for ( ; ch == '('; cnt += 1 ) { // left parenthesis |
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28 | suspend; |
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29 | } |
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30 | for ( ; ch == ')' && cnt > 1; cnt -= 1 ) { // right parenthesis |
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31 | suspend; |
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32 | } |
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33 | status = ch == ')' ? Match : Error; |
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34 | } // main |
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35 | |
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36 | void ?{}( CntParens & cpns ) with( cpns ) { status = Cont; cnt = 0; } |
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37 | |
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38 | Status next( CntParens & cpns, char c ) with( cpns ) { |
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39 | ch = c; |
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40 | resume( cpns ); |
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41 | return status; |
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42 | } |
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43 | |
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44 | int main() { |
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45 | CntParens cpns; |
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46 | char ch; |
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47 | |
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48 | try { |
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49 | for () { // read until end of file |
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50 | sin | ch; // read one character |
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51 | Status ret = next( cpns, ch ); // push character for formatting |
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52 | if ( ret == Match ) { sout | "Match"; break; } |
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53 | if ( ret == Error ) { sout | "Error"; break; } |
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54 | } // for |
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55 | } catch( end_of_file * ) { |
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56 | sout | "Error"; |
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57 | } // try |
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58 | } // main |
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59 | |
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60 | // Local Variables: // |
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61 | // tab-width: 4 // |
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62 | // compile-command: "cfa -g -Wall -Wextra cntparens.cfa" // |
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63 | // End: // |
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