source: tests/coroutine/fmtLines.cfa @ 7a37fcb1

//
// 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.
//
// fmtLines.cc -- format characters into blocks of 4 and groups of 5 blocks per line
//
// Author           : Peter A. Buhr
// Created On       : Sun Sep 17 21:56:15 2017
// Last Modified By : Peter A. Buhr
// Last Modified On : Sat Aug 17 14:26:03 2024
// Update Count     : 60
//

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

coroutine Format {
        char ch;                                                                                        // used for communication
        int g, b;                                                                                       // global because used in destructor
};

void main( Format & fmt ) with( fmt ) {
        for () {                                                                                        // for as many characters
                for ( g = 0; g < 5; g += 1 ) {                                  // groups of 5 blocks
                        for ( b = 0; b < 4; b += 1 ) {                          // blocks of 4 characters
                                for () {                                                                // for newline characters
                                        suspend;
                                  if ( ch != '\n' ) break;                              // ignore newline
                                } // for
                                sout | ch;                                                              // print character
                        } // for
                        sout | "  ";                                                            // print block separator
                } // for
                sout | nl;                                                                              // print group separator
        } // for
} // main

void ?{}( Format & fmt ) {
        resume( fmt );                                                                          // prime (start) coroutine
}

void ^?{}( Format & fmt ) with( fmt ) {
        if ( g != 0 || b != 0 ) sout | nl;
}

void format( Format & fmt ) {
        resume( fmt );
} // format

int main() {
        Format fmt;
        sout | nlOff;                                                                           // turn off auto newline

        try {
                for () {                                                                                // read until end of file
                        sin | fmt.ch;                                                           // read one character
                        format( fmt );                                                          // push character for formatting
                } // for
        } catch( end_of_file * ) {
        } // try
} // main