text: public List<Token> getHiddenTokensToLeft(int tokenIndex, int channel) {lazyInit();if ( tokenIndex<0 || tokenIndex>=tokens.size() ) {throw new IndexOutOfBoundsException(tokenIndex+" not in 0.."+(tokens.size()-1));}if (tokenIndex == 0) {return null;}int prevOnChannel =previousTokenOnChannel(tokenIndex - 1, Lexer.DEFAULT_TOKEN_CHANNEL);if ( prevOnChannel == tokenIndex - 1 ) return null;int from = prevOnChannel+1;int to = tokenIndex-1;return filterForChannel(from, to, channel);}