//
// 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