src/main/java/com/bazaarvoice/jless/parser/Parser.java
Rule ExpressionPhrase() {
        // Space-separated expressions
        return Sequence(
                Expression(), push(new ExpressionPhraseNode(pop())),
                ZeroOrMore(Ws1(), Expression(), peek(1).addChild(pop())),
                Optional(Ws0(), Important(), peek(1).addChild(pop()))
        );
    }
Rule ExpressionPhrase() {
        // Space-separated expressions
        return Sequence(
                Expression(), push(new ExpressionPhraseNode(pop())),
                ZeroOrMore(Ws1(), Expression(), peek(1).addChild(pop())),
                Optional(Ws0(), Important(), peek(1).addChild(pop()))
        );
    }
Expression (Operator Expression)+ Future: Operations
/ Expression (Ws1 Expression)* Important?