Last change
on this file since 31f4837 was
427854b,
checked in by Thierry Delisle <tdelisle@…>, 4 years ago
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First draft implementation of generators, still missing error checking, testing and clean-up
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-
Property mode set to
100644
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File size:
1.5 KB
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Rev | Line | |
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[427854b] | 1 | // |
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[8f194ee] | 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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[427854b] | 6 | // |
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[8f194ee] | 7 | // cntparens.cfa -- match left/right parenthesis |
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[427854b] | 8 | // |
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[8f194ee] | 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 : Sat Apr 20 11:06:21 2019 |
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| 13 | // Update Count : 1 |
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[427854b] | 14 | // |
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[8f194ee] | 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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[427854b] | 28 | suspend; |
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[8f194ee] | 29 | } |
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| 30 | for ( ; ch == ')' && cnt > 1; cnt -= 1 ) { // right parenthesis |
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[427854b] | 31 | suspend; |
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[8f194ee] | 32 | } |
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| 33 | status = ch == ')' ? Match : Error; |
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| 34 | } // main |
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[427854b] | 35 | |
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[8f194ee] | 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 | for () { // read until end of file |
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| 49 | sin | ch; // read one character |
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| 50 | if ( eof( sin ) ) { sout | "Error"; break; } // eof ? |
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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 | } // main |
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| 56 | |
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| 57 | // Local Variables: // |
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| 58 | // tab-width: 4 // |
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| 59 | // compile-command: "cfa -g -Wall -Wextra cntparens.cfa" // |
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| 60 | // End: // |
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