New Macro Syntax Proposal

[Davidl]

Obviously the one I posted yesterday is not easy for IDE to highlight  
sub-language set
and also it lacks the power of parse different sub-language expressions. I  
think the
goal of macro should be powerful enough to introduce a new sub language.  
Then the macro
itself could be called mature.
Consider the following

macro MyPowerfulMacro = CODEGEN //indicate the backend gen code output  
string
{
KeyWordList(CASE_INSENSITIVE)	// this is for IDE highlight
//the design here doesn't pollute keyword we have now, KeyWordList,  
Expression Backend all only take effect in macro expression
{
    object, TOKEN.object,
    end,    TOKEN.end,
}
Expression
{
    expdeclare ::= EXP.expdeclare(objid, objattr[])
	TOKEN.object {( TOKEN.identifier:objid TOKEN.identifier:~objattr  
TOKEN.colon TOKEN.object)
		| (EXP.expdeclare:objexp)  } TOKEN.end
}

Backend EXP.expdeclare(objid, objattr[])
{
	CODEGEN ~= class "~objid.strinof)~"{;
	foreach(k;objattr)
	{
		CODEGEN ~= "class "~k.stringof~"{}"
	}
	CODEGEN ~= "}"
}

}