### Home Classes Methods

### In Files

- ext/r_analysis.c

### Parent

Object

### Namespace

- CLASS Ferret::QueryParser::QueryParseException

### Methods

- ::new
- #fields
- #fields=
- #parse
- #tokenized_fields
- #tokenized_fields=

### Files

- MIT-LICENSE
- README
- TODO
- TUTORIAL

### Class/Module Index

Quicksearch

- Ferret
- Ferret::Analysis
- Ferret::Analysis::Analyzer
- Ferret::Analysis::AsciiLetterAnalyzer
- Ferret::Analysis::AsciiLetterTokenizer
- Ferret::Analysis::AsciiLowerCaseFilter
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- Ferret::Analysis::AsciiStandardTokenizer
- Ferret::Analysis::AsciiWhiteSpaceAnalyzer
- Ferret::Analysis::AsciiWhiteSpaceTokenizer
- Ferret::Analysis::HyphenFilter
- Ferret::Analysis::LetterAnalyzer
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- Ferret::Analysis::MappingFilter
- Ferret::Analysis::PerFieldAnalyzer
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- Ferret::QueryParser
- Ferret::QueryParser::QueryParseException
- Ferret::Search
- Ferret::Search::BooleanQuery
- Ferret::Search::BooleanQuery::BooleanClause
- Ferret::Search::ConstantScoreQuery
- Ferret::Search::Explanation
- Ferret::Search::Filter
- Ferret::Search::FilteredQuery
- Ferret::Search::FuzzyQuery
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- Ferret::Search::MatchAllQuery
- Ferret::Search::MultiSearcher
- Ferret::Search::MultiTermQuery
- Ferret::Search::PhraseQuery
- Ferret::Search::PrefixQuery
- Ferret::Search::Query
- Ferret::Search::QueryFilter
- Ferret::Search::RangeFilter
- Ferret::Search::RangeQuery
- Ferret::Search::Searcher
- Ferret::Search::Sort
- Ferret::Search::SortField
- Ferret::Search::Spans
- Ferret::Search::Spans::SpanFirstQuery
- Ferret::Search::Spans::SpanMultiTermQuery
- Ferret::Search::Spans::SpanNearQuery
- Ferret::Search::Spans::SpanNotQuery
- Ferret::Search::Spans::SpanOrQuery
- Ferret::Search::Spans::SpanPrefixQuery
- Ferret::Search::Spans::SpanTermQuery
- Ferret::Search::TermQuery
- Ferret::Search::TopDocs
- Ferret::Search::TypedRangeFilter
- Ferret::Search::TypedRangeQuery
- Ferret::Search::WildcardQuery
- Ferret::StateError
- Ferret::Store
- Ferret::Store::Directory
- Ferret::Store::FSDirectory
- Ferret::Store::Lock
- Ferret::Store::Lock::LockError
- Ferret::Store::RAMDirectory
- Ferret::Utils
- Ferret::Utils::BitVector
- Ferret::Utils::MultiMapper
- Ferret::Utils::PriorityQueue
- WEBrick
- WEBrick::FerretBrowserHandler
- Date
- DateTime
- FileUtils
- Float
- Integer
- String
- Symbol
- Time

No matching classes.

# Ferret::QueryParser

## Summary

The QueryParser is used to transform user submitted query strings into QueryObjects. Ferret using its own Query Language known from now on as Ferret Query Language or FQL.

## Ferret Query Language

### Preamble

The following characters are special characters in FQL;

    :, (, ), [, ], {, }, !, +, ", ~, ^, -, |, <, >, =, *, ?, \

If you want to use one of these characters in one of your terms you need to escape it with a \ character. \ escapes itself. The exception to this rule is within Phrases which a strings surrounded by double quotes (and will be explained further bellow in the section on PhraseQueries). In Phrases, only ", | and <> have special meaning and need to be escaped if you want the literal value. <> is escaped <>.

In the following examples I have only written the query string. This would be parse like;

    query = query_parser.parse("pet:(dog AND cat)")
    puts query    # => "+pet:dog +pet:cat"

### TermQuery

A term query is the most basic query of all and is what most of the other queries are built upon. The term consists of a single word. eg;

    'term'

Note that the analyzer will be run on the term and if it splits the term in two then it will be turned into a phrase query. For example, with the plain Ferret::Analysis::Analyzer, the following;

    'dave12balmain'

is equivalent to;

    '"dave balmain"'

Which we will explain now...

### PhraseQuery

A phrase query is a string of terms surrounded by double quotes. For example you could write;

    '"quick brown fox"'

But if a "fast" fox is just as good as a quick one you could use the | character to specify alternate terms.

    '"quick|speedy|fast brown fox"'

What if we don't care what colour the fox is. We can use the <> to specify a place setter. eg;

    '"quick|speedy|fast <> fox"'

This will match any word in between quick and fox. Alternatively we could set the "slop" for the phrase which allows a certain variation in the match of the phrase. The slop for a phrase is an integer indicating how many positions you are allowed to move the terms to get a match. Read more about the slop factor in Ferret::Search::PhraseQuery. To set the slop factor for a phrase you can type;

    '"big house"~2'

This would match "big house", "big red house", "big red brick house" and even "house big". That's right, you don't need to have th terms in order if you allow some slop in your phrases. (See Ferret::Search::Spans if you need a phrase type query with ordered terms.)

These basic queries will be run on the default field which is set when you create the query_parser. But what if you want to search a different field. You'll be needing a ...

### FieldQuery

A field query is any field prefixed by <fieldname>:. For example, to search for all instances of the term "ski" in field "sport", you'd write;

    'sport:ski'

Or we can apply a field to phrase;

    'sport:"skiing is fun"'

Now we have a few types of queries, we'll be needing to glue them together with a ...

### BooleanQuery

There are a couple of ways of writing boolean queries. Firstly you can specify which terms are required, optional or required not to exist (not).

- '+' or "REQ" can be used to indicate a required query. "REQ" must be surrounded by white space.

- '-', '!' or "NOT" are used to indicate query that is required to be false. "NOT" must be surrounded by white space.

- all other queries are optional if the above symbols are used.

Some examples;

    '+sport:ski -sport:snowboard sport:toboggan'
    '+ingredient:chocolate +ingredient:strawberries -ingredient:wheat'

You may also use the boolean operators "AND", "&&", "OR" and "||". eg;

    'sport:ski AND NOT sport:snowboard OR sport:toboggan'
    'ingredient:chocolate AND ingredient:strawberries AND NOT ingredient:wheat'

You can set the default operator when you create the query parse.

### RangeQuery

A range query finds all documents with terms between the two query terms. This can be very useful in particular for dates. eg;

    'date:[20050725 20050905]' # all dates >= 20050725 and <= 20050905
    'date:[20050725 20050905}' # all dates >= 20050725 and <  20050905
    'date:{20050725 20050905]' # all dates >  20050725 and <= 20050905
    'date:{20050725 20050905}' # all dates >  20050725 and <  20050905

You can also do open ended queries like this;

    'date:[20050725>' # all dates >= 20050725
    'date:{20050725>' # all dates >  20050725
    'date:<20050905]' # all dates <= 20050905
    'date:<20050905}' # all dates <  20050905

Or like this;

    'date: >= 20050725'
    'date: >  20050725'
    'date: <= 20050905'
    'date: <  20050905'

If you prefer the above style you could use a boolean query but like this;

    'date:( >= 20050725 AND <= 20050905)'

But rangequery only solution shown first will be faster.

### WildQuery

A wild query is a query using the pattern matching characters * and ?. * matches 0 or more characters while ? matches a single character. This type of query can be really useful for matching hierarchical categories for example. Let's say we had this structure;

    /sport/skiing
    /sport/cycling
    /coding1/ruby
    /coding1/c
    /coding2/python
    /coding2/perl

If you wanted all categories with programming languages you could use the query;

    'category:/coding?/?*'

Note that this query can be quite expensive if not used carefully. In the example above there would be no problem but you should be careful not use the wild characters at the beginning of the query as it'll have to iterate through every term in that field. Having said that, some fields like the category field above will only have a small number of distinct fields so this could be okay.

### FuzzyQuery

This is like the sloppy phrase query above, except you are now adding slop to a term. Basically it measures the Levenshtein distance between two terms and if the value is below the slop threshold the term is a match. This time though the slop must be a float between 0 and 1.0, 1.0 being a perfect match and 0 being far from a match. The default is set to 0.5 so you don't need to give a slop value if you don't want to. You can set the default in the Ferret::Search::FuzzyQuery class. Here are a couple of examples;

    'content:ferret~'
    'content:Ostralya~0.4'

Note that this query can be quite expensive. If you'd like to use this query, you may want to set a minimum prefix length in the FuzzyQuery class. This can substantially reduce the number of terms that the query will iterate over.

## Summary

The QueryParser is used to transform user submitted query strings into QueryObjects. Ferret using its own Query Language known from now on as Ferret Query Language or FQL.

## Ferret Query Language

### Preamble

The following characters are special characters in FQL;

    :, (, ), [, ], {, }, !, +, ", ~, ^, -, |, <, >, =, *, ?, \

If you want to use one of these characters in one of your terms you need to escape it with a \ character. \ escapes itself. The exception to this rule is within Phrases which a strings surrounded by double quotes (and will be explained further bellow in the section on PhraseQueries). In Phrases, only ", | and <> have special meaning and need to be escaped if you want the literal value. <> is escaped <>.

In the following examples I have only written the query string. This would be parse like;

    query = query_parser.parse("pet:(dog AND cat)")
    puts query    # => "+pet:dog +pet:cat"

### TermQuery

A term query is the most basic query of all and is what most of the other queries are built upon. The term consists of a single word. eg;

    'term'

Note that the analyzer will be run on the term and if it splits the term in two then it will be turned into a phrase query. For example, with the plain Ferret::Analysis::Analyzer, the following;

    'dave12balmain'

is equivalent to;

    '"dave balmain"'

Which we will explain now...

### PhraseQuery

A phrase query is a string of terms surrounded by double quotes. For example you could write;

    '"quick brown fox"'

But if a "fast" fox is just as good as a quick one you could use the | character to specify alternate terms.

    '"quick|speedy|fast brown fox"'

What if we don't care what colour the fox is. We can use the <> to specify a place setter. eg;

    '"quick|speedy|fast <> fox"'

This will match any word in between quick and fox. Alternatively we could set the "slop" for the phrase which allows a certain variation in the match of the phrase. The slop for a phrase is an integer indicating how many positions you are allowed to move the terms to get a match. Read more about the slop factor in Ferret::Search::PhraseQuery. To set the slop factor for a phrase you can type;

    '"big house"~2'

This would match "big house", "big red house", "big red brick house" and even "house big". That's right, you don't need to have th terms in order if you allow some slop in your phrases. (See Ferret::Search::Spans if you need a phrase type query with ordered terms.)

These basic queries will be run on the default field which is set when you create the query_parser. But what if you want to search a different field. You'll be needing a ...

### FieldQuery

A field query is any field prefixed by <fieldname>:. For example, to search for all instances of the term "ski" in field "sport", you'd write;

    'sport:ski'

Or we can apply a field to phrase;

    'sport:"skiing is fun"'

Now we have a few types of queries, we'll be needing to glue them together with a ...

### BooleanQuery

There are a couple of ways of writing boolean queries. Firstly you can specify which terms are required, optional or required not to exist (not).

- '+' or "REQ" can be used to indicate a required query. "REQ" must be surrounded by white space.

- '-', '!' or "NOT" are used to indicate query that is required to be false. "NOT" must be surrounded by white space.

- all other queries are optional if the above symbols are used.

Some examples;

    '+sport:ski -sport:snowboard sport:toboggan'
    '+ingredient:chocolate +ingredient:strawberries -ingredient:wheat'

You may also use the boolean operators "AND", "&&", "OR" and "||". eg;

    'sport:ski AND NOT sport:snowboard OR sport:toboggan'
    'ingredient:chocolate AND ingredient:strawberries AND NOT ingredient:wheat'

You can set the default operator when you create the query parse.

### RangeQuery

A range query finds all documents with terms between the two query terms. This can be very useful in particular for dates. eg;

    'date:[20050725 20050905]' # all dates >= 20050725 and <= 20050905
    'date:[20050725 20050905}' # all dates >= 20050725 and <  20050905
    'date:{20050725 20050905]' # all dates >  20050725 and <= 20050905
    'date:{20050725 20050905}' # all dates >  20050725 and <  20050905

You can also do open ended queries like this;

    'date:[20050725>' # all dates >= 20050725
    'date:{20050725>' # all dates >  20050725
    'date:<20050905]' # all dates <= 20050905
    'date:<20050905}' # all dates <  20050905

Or like this;

    'date: >= 20050725'
    'date: >  20050725'
    'date: <= 20050905'
    'date: <  20050905'

If you prefer the above style you could use a boolean query but like this;

    'date:( >= 20050725 AND <= 20050905)'

But rangequery only solution shown first will be faster.

### WildQuery

A wild query is a query using the pattern matching characters * and ?. * matches 0 or more characters while ? matches a single character. This type of query can be really useful for matching hierarchical categories for example. Let's say we had this structure;

    /sport/skiing
    /sport/cycling
    /coding1/ruby
    /coding1/c
    /coding2/python
    /coding2/perl

If you wanted all categories with programming languages you could use the query;

    'category:/coding?/?*'

Note that this query can be quite expensive if not used carefully. In the example above there would be no problem but you should be careful not use the wild characters at the beginning of the query as it'll have to iterate through every term in that field. Having said that, some fields like the category field above will only have a small number of distinct fields so this could be okay.

### FuzzyQuery

This is like the sloppy phrase query above, except you are now adding slop to a term. Basically it measures the Levenshtein distance between two terms and if the value is below the slop threshold the term is a match. This time though the slop must be a float between 0 and 1.0, 1.0 being a perfect match and 0 being far from a match. The default is set to 0.5 so you don't need to give a slop value if you don't want to. You can set the default in the Ferret::Search::FuzzyQuery class. Here are a couple of examples;

    'content:ferret~'
    'content:Ostralya~0.4'

Note that this query can be quite expensive. If you'd like to use this query, you may want to set a minimum prefix length in the FuzzyQuery class. This can substantially reduce the number of terms that the query will iterate over.

### Public Class Methods

new(options = {}) → QueryParser click to toggle source

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 and range 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_parse_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

:use_keywords

Default: true. By default AND, OR, NOT and REQ are keywords used by the query parser. Sometimes this is undesirable. For example, if your application allows searching for US states by their abbreviation, then OR will be a common query string. By setting :use_keywords to false, OR will no longer be a keyword allowing searches for the state of Oregon. You will still be able to use boolean queries by using the + and - characters.

:use_typed_range_query

Default: false. Use TypedRangeQuery instead of the standard RangeQuery when parsing range queries. This is useful if you have number fields which you want to perform range queries on. You won't need to pad or normalize the data in the field in anyway to get correct results. However, performance will be a lot slower for large indexes, hence the default. Note: the default is set to true in the Index class.

    static VALUE
    frb_qp_init(int argc, VALUE *argv, VALUE self)
    {
        VALUE roptions = Qnil;
        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 = frb_get_fields(rval);
                }
                if (Qnil != (rval = rb_hash_aref(roptions, sym_analyzer))) {
                    analyzer = frb_get_cwrapped_analyzer(rval);
                }
                if (Qnil != (rval = rb_hash_aref(roptions, sym_all_fields))) {
                    all_fields = frb_get_fields(rval);
                }
                if (Qnil != (rval = rb_hash_aref(roptions, sym_fields))) {
                    all_fields = frb_get_fields(rval);
                }
                if (Qnil != (rval = rb_hash_aref(roptions, sym_tkz_fields))) {
                    tkz_fields = frb_get_fields(rval);
                }
            } else {
                def_fields = frb_get_fields(roptions);
                roptions = Qnil;
            }
        }
        if (all_fields == NULL) {
            all_fields = hs_new_ptr(NULL);
        }

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

        qp = qp_new(analyzer);
        hs_destroy(qp->all_fields);
        hs_destroy(qp->def_fields);
        //hs_destroy(qp->tokenized_fields);

        if (def_fields) hs_safe_merge(all_fields, def_fields);
        if (tkz_fields) hs_safe_merge(all_fields, tkz_fields);
        qp->all_fields = all_fields;
        qp->def_fields = def_fields ? def_fields : all_fields;
        qp->tokenized_fields = tkz_fields ? tkz_fields : all_fields;
        qp->fields_top->fields = def_fields;

        qp->allow_any_fields = true;
        qp->clean_str = true;
        qp->handle_parse_errors = true;
        /* handle options */
        if (roptions != Qnil) {
            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);
            }
            if (Qnil != (rval = rb_hash_aref(roptions, sym_use_keywords))) {
                qp->use_keywords = RTEST(rval);
            }
            if (Qnil != (rval = rb_hash_aref(roptions, sym_use_typed_range_query))){
                qp->use_typed_range_query = RTEST(rval);
            }
        }
        Frt_Wrap_Struct(self, frb_qp_mark, frb_qp_free, qp);
        object_add(qp, self);
        return self;
    }

### Public Instance Methods

fields → Array of Symbols click to toggle source

Returns the list of all fields that the QueryParser knows about.

    static VALUE
    frb_qp_get_fields(VALUE self)
    {
        GET_QP;
        HashSet *fields = qp->all_fields;
        HashSetEntry *hse;
        VALUE rfields = rb_ary_new();

        for (hse = fields->first; hse; hse = hse->next) {
            rb_ary_push(rfields, ID2SYM(rb_intern((char *)hse->elem)));
        }

        return rfields;
    }

fields = fields → self click to toggle source

Set the list of fields. These fields are expanded for searches on "*".

    static VALUE
    frb_qp_set_fields(VALUE self, VALUE rfields)
    {
        GET_QP;
        HashSet *fields = frb_get_fields(rfields);

        /* if def_fields == all_fields then we need to replace both */
        if (qp->def_fields == qp->all_fields) qp->def_fields = NULL;
        if (qp->tokenized_fields == qp->all_fields) qp->tokenized_fields = NULL;

        if (fields == NULL) {
            fields = hs_new_ptr(NULL);
        }

        /* make sure all the fields in tokenized fields are contained in
         * all_fields */
        if (qp->tokenized_fields) hs_safe_merge(fields, qp->tokenized_fields);

        /* delete old fields set */
        assert(qp->all_fields->free_elem_i == dummy_free);
        hs_destroy(qp->all_fields);

        /* add the new fields set and add to def_fields if necessary */
        qp->all_fields = fields;
        if (qp->def_fields == NULL) {
            qp->def_fields = fields;
            qp->fields_top->fields = fields;
        }
        if (qp->tokenized_fields == NULL) qp->tokenized_fields = fields;

        return self;
    }

parse(query_string) → Query click to toggle source

Parse a query string returning a Query object if parsing was successful. Will raise a QueryParseException if unsuccessful.

    static VALUE
    frb_qp_parse(VALUE self, VALUE rstr)
    {
        const char *msg = NULL;
        volatile VALUE rq;
        GET_QP;
        rstr = rb_obj_as_string(rstr);
        TRY
            rq = frb_get_q(qp_parse(qp, rs2s(rstr)));
            break;
        default:
            msg = xcontext.msg;
            HANDLED();
        XENDTRY

        if (msg) {
            rb_raise(cQueryParseException, "%s", msg);
        }

        return rq;
    }

tokenized_fields → Array of Symbols click to toggle source

Returns the list of all tokenized_fields that the QueryParser knows about.

    static VALUE
    frb_qp_get_tkz_fields(VALUE self)
    {
        GET_QP;
        HashSet *fields = qp->tokenized_fields;
        if (fields) {
            VALUE rfields = rb_ary_new();
            HashSetEntry *hse;

            for (hse = fields->first; hse; hse = hse->next) {
                rb_ary_push(rfields, ID2SYM(rb_intern((char *)hse->elem)));
            }

            return rfields;
        }
        else {
            return Qnil;
        }
    }

tokenized_fields = fields → self click to toggle source

Set the list of tokenized_fields. These tokenized_fields are tokenized in the queries. If this is set to Qnil then all fields will be tokenized.

    static VALUE
    frb_qp_set_tkz_fields(VALUE self, VALUE rfields)
    {
        GET_QP;
        if (qp->tokenized_fields != qp->all_fields) {
            hs_destroy(qp->tokenized_fields);
        }
        qp->tokenized_fields = frb_get_fields(rfields);
        return self;
    }

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