    /*
     *  call-seq:
     *     QueryParser.new(options = {}) -> QueryParser
     *
     *  Create a new QueryParser. The QueryParser is used to convert string
     *  queries into Query objects. The options are;
     *
     *  === Options
     *
     *  :default_field::        Default: "*" (all fields). The default field to
     *                          search when no field is specified in the search
     *                          string. It can also be an array of fields.
     *  :analyzer::             Default: StandardAnalyzer. Analyzer used by the
     *                          query parser to parse query terms
     *  :wild_card_downcase::   Default: true. Specifies whether wild-card queries
     *                          should be downcased or not since they are not
     *                          passed through the parser
     *  :fields::               Default: []. Lets the query parser know what
     *                          fields are available for searching, particularly
     *                          when the "*" is specified as the search field
     *  :tokenized_fields::     Default: :fields. Lets the query parser know which
     *                          fields are tokenized so it knows which fields to
     *                          run the analyzer over.
     *  :validate_fields::      Default: false. Set to true if you want an
     *                          exception to be raised if there is an attempt to
     *                          search a non-existent field
     *  :or_default::           Default: true. Use "OR" as the default boolean
     *                          operator
     *  :default_slop::         Default: 0. Default slop to use in PhraseQuery
     *  :handle_parser_errors:: Default: true. QueryParser will quietly handle all
     *                          parsing errors internally. If you'd like to handle
     *                          them yourself, set this parameter to false.
     *  :clean_string::         Default: true. QueryParser will do a quick
     *                          once-over the query string make sure that quotes
     *                          and brackets match up and special characters are
     *                          escaped
     *  :max_clauses::          Default: 512. the maximum number of clauses
     *                          allowed in boolean queries and the maximum number
     *                          of terms allowed in multi, prefix, wild-card or
     *                          fuzzy queries when those queries are generated by
     *                          rewriting other queries
     */
    static VALUE
    frt_qp_init(int argc, VALUE *argv, VALUE self)
    {
        VALUE roptions;
        VALUE rval;
        Analyzer *analyzer = NULL;
        bool has_options = false;

        HashSet *all_fields = NULL;
        HashSet *tkz_fields = NULL;
        HashSet *def_fields = NULL;
        QParser *qp;

        if (rb_scan_args(argc, argv, "01", &roptions) > 0) {
            if (TYPE(roptions) == T_HASH) {
                has_options = true;
                if (Qnil != (rval = rb_hash_aref(roptions, sym_default_field))) {
                    def_fields = frt_get_fields(rval);
                }
                if (Qnil != (rval = rb_hash_aref(roptions, sym_analyzer))) {
                    analyzer = frt_get_cwrapped_analyzer(rval);
                }
                if (Qnil != (rval = rb_hash_aref(roptions, sym_all_fields))) {
                    all_fields = frt_get_fields(rval);
                }
                if (Qnil != (rval = rb_hash_aref(roptions, sym_fields))) {
                    all_fields = frt_get_fields(rval);
                }
                if (Qnil != (rval = rb_hash_aref(roptions, sym_tkz_fields))) {
                    tkz_fields = frt_get_fields(rval);
                }
            } else {
                def_fields = frt_get_fields(roptions);
            }
        }
        if (all_fields == NULL) {
            all_fields = hs_new_str(&free);
        }

        if (!analyzer) {
            analyzer = mb_standard_analyzer_new(true);
        }

        qp = qp_new(all_fields, def_fields, tkz_fields, analyzer);
        qp->allow_any_fields = true;
        qp->clean_str = true;
        /* handle options */
        if (argc > 0) {
            if (Qnil != (rval = rb_hash_aref(roptions, sym_handle_parse_errors))) {
                qp->handle_parse_errors = RTEST(rval);
            }
            if (Qnil != (rval = rb_hash_aref(roptions, sym_validate_fields))) {
                qp->allow_any_fields = !RTEST(rval);
            }
            if (Qnil != (rval = rb_hash_aref(roptions, sym_wild_card_downcase))) {
                qp->wild_lower = RTEST(rval);
            }
            if (Qnil != (rval = rb_hash_aref(roptions, sym_or_default))) {
                qp->or_default = RTEST(rval);
            }
            if (Qnil != (rval = rb_hash_aref(roptions, sym_default_slop))) {
                qp->def_slop = FIX2INT(rval);
            }
            if (Qnil != (rval = rb_hash_aref(roptions, sym_clean_string))) {
                qp->clean_str = RTEST(rval);
            }
            if (Qnil != (rval = rb_hash_aref(roptions, sym_max_clauses))) {
                qp->max_clauses = FIX2INT(rval);
            }
        }
        Frt_Wrap_Struct(self, frt_qp_mark, frt_qp_free, qp);
        object_add(qp, self);
        return self;
    }