Method earliestAncestorEndingWithToken

src/org/antlr/codebuff/Trainer.java:447–459

Walk upwards from node while p.stop == token; return immediate parent if there is no ancestor stopping at token. This is the earliest right ancestor. E.g, for '}' of a block, return parent up the chain from block stopping with '}'. For '{' of block, return just block as nothing stops with '{'. (

(TerminalNode node)

	 *  stops with '{'. (block starts with it).
	 */
	public static ParserRuleContext earliestAncestorEndingWithToken(TerminalNode node) {
		Token token = node.getSymbol();
		ParserRuleContext p = (ParserRuleContext)node.getParent();
		ParserRuleContext prev = null;
		while (p!=null && p.getStop()==token) {
			prev = p;
			p = p.getParent();
		}
		if ( prev==null ) {
			return (ParserRuleContext)node.getParent();
		}
		return prev;
	}

	/** Walk upwards from node until we find a child of p at t's char position.
	 *  Don't see alignment with self, t, or element *after* us.