src/main/java/br/com/starcode/parccser/Parser.java
protected Selector selector() throws ParserException {
        int initialPosition = pos;
        StringBuilder sb = new StringBuilder();
        List<SimpleSelectorSequence> simpleSelectors = new ArrayList<SimpleSelectorSequence>();
        List<Combinator> combinators = new ArrayList<Combinator>();
        int lastChar = pos;
        while (!end()) {
        	//finds combinator, but not in the first iteration
        	Combinator combinator = null;
        	if (!simpleSelectors.isEmpty()) {
        		//stores if it has spaces until the next token
                boolean hasWhitespace = false;
                if (!end() && Character.isWhitespace(current)) {
                    hasWhitespace = true;
                    ignoreWhitespaces();
                }
                if (!end()) {
                    //implements "combinator" rule
                    if (current == '+') combinator = Combinator.ADJASCENT_SIBLING;
                    else if (current == '>') combinator = Combinator.CHILD;
                    else if (current == '~') combinator = Combinator.GENERAL_SIBLING;
                    //if hasn't any but spaces
                    else if (hasWhitespace) combinator = Combinator.DESCENDANT;
                    //is it the end?
                    if (combinator == null || current == ',') {
                        break;
                    }
                    //don't advance because spaces were just advanced
                    if (combinator != Combinator.DESCENDANT) {
                    	sb.append(current);
                        next();
                    } else {
                    	sb.append(' ');
                    }
                    ignoreWhitespaces();
                    if (end()) {
                        throw new ParserException("Unexpected end of selector at position " + pos);
                    }
                } else {
                    break;
                }
                combinators.add(combinator);
        	}
        	//get next sequence
            SimpleSelectorSequence simpleSelectorSequence = simpleSelectorSequence();
            sb.append(simpleSelectorSequence);
            //sends combinator here (the first case it's null)
            simpleSelectors.add(simpleSelectorSequence);
            parserListener.selectorSequence(simpleSelectorSequence, combinator);
            lastChar = pos;
        }
        return new Selector(simpleSelectors, combinators, new Context(content, sb.toString(), initialPosition, lastChar));
    }
protected Selector selector() throws ParserException {
        int initialPosition = pos;
        StringBuilder sb = new StringBuilder();
        List<SimpleSelectorSequence> simpleSelectors = new ArrayList<SimpleSelectorSequence>();
        List<Combinator> combinators = new ArrayList<Combinator>();
        int lastChar = pos;
        while (!end()) {
        	//finds combinator, but not in the first iteration
        	Combinator combinator = null;
        	if (!simpleSelectors.isEmpty()) {
        		//stores if it has spaces until the next token
                boolean hasWhitespace = false;
                if (!end() && Character.isWhitespace(current)) {
                    hasWhitespace = true;
                    ignoreWhitespaces();
                }
                if (!end()) {
                    //implements "combinator" rule
                    if (current == '+') combinator = Combinator.ADJASCENT_SIBLING;
                    else if (current == '>') combinator = Combinator.CHILD;
                    else if (current == '~') combinator = Combinator.GENERAL_SIBLING;
                    //if hasn't any but spaces
                    else if (hasWhitespace) combinator = Combinator.DESCENDANT;
                    //is it the end?
                    if (combinator == null || current == ',') {
                        break;
                    }
                    //don't advance because spaces were just advanced
                    if (combinator != Combinator.DESCENDANT) {
                    	sb.append(current);
                        next();
                    } else {
                    	sb.append(' ');
                    }
                    ignoreWhitespaces();
                    if (end()) {
                        throw new ParserException("Unexpected end of selector at position " + pos);
                    }
                } else {
                    break;
                }
                combinators.add(combinator);
        	}
        	//get next sequence
            SimpleSelectorSequence simpleSelectorSequence = simpleSelectorSequence();
            sb.append(simpleSelectorSequence);
            //sends combinator here (the first case it's null)
            simpleSelectors.add(simpleSelectorSequence);
            parserListener.selectorSequence(simpleSelectorSequence, combinator);
            lastChar = pos;
        }
        return new Selector(simpleSelectors, combinators, new Context(content, sb.toString(), initialPosition, lastChar));
    }
protected Selector selector ( ) throws ParserException { int initialPosition = pos ; StringBuilder sb = new StringBuilder ( ) ; List < SimpleSelectorSequence > simpleSelectors = new ArrayList < SimpleSelectorSequence > ( ) ; List < Combinator > combinators = new ArrayList < Combinator > ( ) ; int lastChar = pos ; while ( ! end ( ) ) { //finds combinator, but not in the first iteration
 Combinator combinator = null ; if ( ! simpleSelectors . isEmpty ( ) ) { //stores if it has spaces until the next token
 boolean hasWhitespace = false ; if ( ! end ( ) && Character . isWhitespace ( current ) ) { hasWhitespace = true ; ignoreWhitespaces ( ) ; } if ( ! end ( ) ) { //implements "combinator" rule
 if ( current == ' ' ) combinator = Combinator . ADJASCENT_SIBLING ; else if ( current == ' ' ) combinator = Combinator . CHILD ; else if ( current == ' ' ) combinator = Combinator . GENERAL_SIBLING ; //if hasn't any but spaces
 else if ( hasWhitespace ) combinator = Combinator . DESCENDANT ; //is it the end?
 if ( combinator == null || current == ' ' ) { break ; } //don't advance because spaces were just advanced
 if ( combinator != Combinator . DESCENDANT ) { sb . append ( current ) ; next ( ) ; } else { sb . append ( ' ' ) ; } ignoreWhitespaces ( ) ; if ( end ( ) ) { throw new ParserException ( "Unexpected end of selector at position " + pos ) ; } } else { break ; } combinators . add ( combinator ) ; } //get next sequence
 SimpleSelectorSequence simpleSelectorSequence = simpleSelectorSequence ( ) ; sb . append ( simpleSelectorSequence ) ; //sends combinator here (the first case it's null)
 simpleSelectors . add ( simpleSelectorSequence ) ; parserListener . selectorSequence ( simpleSelectorSequence , combinator ) ; lastChar = pos ; } return new Selector ( simpleSelectors , combinators , new Context ( content , sb . toString ( ) , initialPosition , lastChar ) ) ; }
selector
: simple_selector_sequence [ combinator simple_selector_sequence ]*
;

combinator
: PLUS S* | GREATER S* | TILDE S* | S+
selector : simple_selector_sequence [ combinator simple_selector_sequence ] * ;