Enum xapian_rusty::FeatureFlag

#[repr(i16)]pub enum FeatureFlag {
    FlagBoolean,
    FlagPhrase,
    FlagLovehate,
    FlagBooleanAnyCase,
    FlagWildcard,
    FlagPureNot,
    FlagPartial,
    FlagSpellingCorrection,
    FlagSynonym,
    FlagAutoSynonyms,
    FlagAutoMultiwordSynonyms,
    FlagDefault,
}

Enum of feature flag

Variants

FlagBoolean

Support AND, OR, etc and bracketed subexpressions.

FlagPhrase

Support quoted phrases.

FlagLovehate

Support + and -.

FlagBooleanAnyCase

Support AND, OR, etc even if they aren't in ALLCAPS.

FlagWildcard

Support right truncation (e.g. Xap*).

• Currently you can't use wildcards with boolean filter prefixes,
• or in a phrase (either an explicitly quoted one, or one implicitly
• generated by hyphens or other punctuation).
• NB: You need to tell the QueryParser object which database to
• expand wildcards from by calling set_database.

FlagPureNot

Allow queries such as 'NOT apples'.

• These require the use of a list of all documents in the database
• which is potentially expensive, so this feature isn't enabled by
• default.

FlagPartial

Enable partial matching.

• Partial matching causes the parser to treat the query as a
• "partially entered" search. This will automatically treat the
• final word as a wildcarded match, unless it is followed by
• whitespace, to produce more stable results from interactive
• searches.
• Currently FLAG_PARTIAL doesn't do anything if the final word
• in the query has a boolean filter prefix, or if it is in a phrase
• (either an explicitly quoted one, or one implicitly generated by
• hyphens or other punctuation). It also doesn't do anything if
• if the final word is part of a value range.
• NB: You need to tell the QueryParser object which database to
• expand wildcards from by calling set_database.

FlagSpellingCorrection

Enable spelling correction.

• For each word in the query which doesn't exist as a term in the
• database, Database::get_spelling_suggestion() will be called and if
• a suggestion is returned, a corrected version of the query string
• will be built up which can be read using
• QueryParser::get_corrected_query_string(). The query returned is
• based on the uncorrected query string however - if you want a
• parsed query based on the corrected query string, you must call
• QueryParser::parse_query() again.
• NB: You must also call set_database() for this to work.

FlagSynonym

Enable synonym operator '~'.

• NB: You must also call set_database() for this to work.

FlagAutoSynonyms

Enable automatic use of synonyms for single terms.

• NB: You must also call set_database() for this to work.

FlagAutoMultiwordSynonyms

Enable automatic use of synonyms for single terms and groups of

• terms.
• NB: You must also call set_database() for this to work.

FlagDefault

The default flags.

• Used if you don't explicitly pass any to @a parse_query().
• The default flags are FLAG_PHRASE|FLAG_BOOLEAN|FLAG_LOVEHATE.
• Added in Xapian 1.0.11.