source: tests/coroutine/cntparens.cfa@ 5db17077

//
// Cforall Version 1.0.0 Copyright (C) 2017 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// cntparens.cfa -- match left/right parenthesis
//
// Author           : Peter A. Buhr
// Created On       : Sat Apr 20 11:04:45 2019
// Last Modified By : Peter A. Buhr
// Last Modified On : Thu Aug 15 20:39:34 2024
// Update Count     : 2
//

#include <fstream.hfa>
#include <coroutine.hfa>

enum Status { Cont, Match, Error };
coroutine CntParens {
        char ch;                                                                                        // used for communication
        Status status;
        unsigned int cnt;
}; // CntParens

void main( CntParens & cpns ) with( cpns ) {
        for ( ; ch == '('; cnt += 1 ) {                                         // left parenthesis
                suspend;
        }
        for ( ; ch == ')' && cnt > 1; cnt -= 1 ) {                      // right parenthesis
                suspend;
        }
        status = ch == ')' ? Match : Error;
} // main

void ?{}( CntParens & cpns ) with( cpns ) { status = Cont; cnt = 0; }

Status next( CntParens & cpns, char c ) with( cpns ) {
        ch = c;
        resume( cpns );
        return status;
}

int main() {
        CntParens cpns;
        char ch;

        try {
                for () {                                                                                        // read until end of file
                        sin | ch;                                                                               // read one character
                        Status ret = next( cpns, ch );                                  // push character for formatting
                        if ( ret == Match ) { sout | "Match"; break; }
                        if ( ret == Error ) { sout | "Error"; break; }
                } // for
        } catch( end_of_file * ) {
                sout | "Error";
        } // try
} // main

// Local Variables: //
// tab-width: 4 //
// compile-command: "cfa -g -Wall -Wextra cntparens.cfa" //
// End: //