// Arithmetic interpreter main program.
//
// File:        interpreter.cc
// Author:      course
// Version:     2
//
// This file defines the arithmetic interpreter main
// program.
//

#include "lexeme.h"
#include "parser.h"

int main ()
{
    enable_out_of_memory_error(true);

    for (;;)
    {
	init_lexemes();
	init_avalues();

	if (setjmp (error_jmp))
	{
	    // Come here if an error occurs,
	    // after the error message is printed.

	    cout << "\n";
	    flush_lexemes();

	    continue;
	}

	cout << "Please enter your program, "
	     << "ending with a '"
	     << EOF_MARKER << "'.\n"
	     << "Type ^D to quit.\n\n";

	if (end_lexemes()) break;

	avalue result = program();

	// program() may write to cout, so it must
	// be finished before next statement begins.

	cout << "\nValue:\n" << result << "\n\n";
    }

    return 0;
}