Method viableLeftTokenTypes

src/org/antlr/codebuff/Trainer.java:722–733

(ParserRuleContext node,
	                                                 Token curToken,
	                                                 List<Pair<Integer,Integer>> pairs)

	}

	public static List<Integer> viableLeftTokenTypes(ParserRuleContext node,
	                                                 Token curToken,
	                                                 List<Pair<Integer,Integer>> pairs)
	{
		List<Integer> newPairs = new ArrayList<>();
		for (Pair<Integer, Integer> p : pairs) {
			if ( p.b==curToken.getType() && !node.getTokens(p.a).isEmpty() ) {
				newPairs.add(p.a);
			}
		}
		return newPairs;
	}

	/** Search backwards from tokIndex into 'tokens' stream and get all on-channel
	 *  tokens on previous line with respect to token at tokIndex.