Match:
	'match'
	'{'
	target=Target
	subject=Subject
	action=Action
	matcher=Matcher
	'}';

Target:
	'target' '=' value=STRING;

Subject:
	'subject' '=' value=STRING]

Action:
	'action' '=' value=STRING;

Matcher:
	'contextMatcher' '=' value=ID;

match {
	target = ".*"	
	subject = "foo"
	action = ".*"
	contextMatcher = MATCH_ALWAYS
}

match {
	target = ".*"	
subject = "foo"
action = ".*"
contextMatcher = MATCH_ALWAYS
}

def dispatch void format(Match match, extension IFormattableDocument document) {

	match.regionFor.keyword('match').append[oneSpace]
	match.regionFor.keyword(matchAccess.leftCurlyBracketKeyword_1).append[newLine]
	match.regionFor.keyword(matchAccess.rightCurlyBracketKeyword_6).prepend[newLine]
	interior(match.regionFor.keyword(matchAccess.leftCurlyBracketKeyword_1),match.regionFor.keyword(matchAccess.rightCurlyBracketKeyword_6))[indent]
}

greetings {
		// hello...
	Hello X !
		Hello Y !	Hello Z !
					// ...world!
}

greetings {
	// hello...
	Hello X !
	Hello Y !
	Hello Z !
	// ...world!
}

greetings {
	// hello...
	Hello X !
	Hello Y !
	Hello Z !
// ...world!
}

    def dispatch void format(Model model, extension IFormattableDocument document) {
		model.regionFor.keyword("{").append[newLine]
		model.regionFor.keyword("}").prepend[newLine]
		interior(
			model.regionFor.keyword("{"),
			model.regionFor.keyword("}")
		)[indent]
		for (greeting : model.greetings) {
			greeting.prepend[newLine]
		}
                // HOW DO I PREPEND NEW LINE TO COMMENTS?
	}

class MyDslFormatter extends AbstractFormatter2 {

    @Inject extension MyDslGrammarAccess

    def dispatch void format(Model model, extension IFormattableDocument document) {
        model.regionFor.keyword("{").append[newLine]
        model.regionFor.keyword("}").prepend[newLine]
        interior(
            model.regionFor.keyword("{"),
            model.regionFor.keyword("}"),
            [indent]
        // it's for all kinds of braces!
        )
        for (greeting : model.greetings) {
            greeting.prepend[newLine]
        // this comment is indented at the closing brace level by xtend!
        }
    // this comment is indented at the closing brace level by xtend!
    }
}