protected Token peek(int offset) {
		if ((position + offset) >= tokenStream.size()) {
			return null;
		}
		return tokenStream.get(position + offset);
	}
Return the token at the specified offset from the current position. If there
are no more tokens, return {@code null}.

@return token at specified offset from current position or {@code null} if there are no more tokens
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/job/dsl/Tokens.java