AssembleCurrentSource (CurrentSource)
{
	IsInstruction = 0;
	Instruction.w = 0;
	Size.w = 0
	Arg1.l = 0;
	Arg2.l = 0;

	SkipFirstChar;

	if (EOF)
	{
		if (IAmAMacro)
			exit (ErrorNoEndmDirective);

		return;
	}

	if (SomethingIsAtBeginningOfLine)
	{
		if (Comment)
		{
			SkipLine ();
			Loop;
		}

		if (SymbolIsValid)
		{
			AddLabel ();
		}
	}

	else	// Line begins with a white space / tab
	{
		SkipSpaces ();

		if (EOF)
		{
			if (IAmAMacro)
				exit (ErrorNoEndmDirective);
		}

		// We should find an instruction, a directive, a macro, a macro argument or a comment

		if (symbol = IsInstruction)
		{
			IsInstruction == true;
			Instruction = symbol;

			if (InstructionHas1Arg)
				Arg1 = ReadArg();

			if (InstructionHas2Args)
				Arg2 = ReadArg ();
		}

		else if (symbol = IsDirective)
		{
			ExecDirective (symbol);
		}

		else if (IsArgOfMacro)
		{
			if (!IAmAMacro)
				exit (ErrorMacroArgOutOfAMacro);

			AddParentMacroFileInFilesList ();
			...

		}

		else if (Comment)
		{
			SkipLine ();
			Loop;
		}

		else	// This must be a macro
		{
			if (FindMacro (symbol))
			{
				AddFileOfMacroInFilesList ();	// Replace current source with the one which contains the macro
				AssembleCurrentSource ();	// Use a setjmp here. endm directive will come back with a longjmp
				RemoveLastSource ();
			}

			else
			{
				exit (ErrorUnknownSymbol);
			}
		}
	}
}