Crate lucene_query_syntax 

lucene-query-syntax

Converts (a subset of) the Lucene query syntax to SQL queries.

Currently, it supports the following features:

• Words: single words, like potato;
• Phrases: quoted strings, such as "some stuff";
• Named words or phrases: a word or phrase prefixed by <fieldname>:;
• Groups: parenthesized queries of any sort;
• Negation: negates the condition of any term by prefixing it with -;
• Ranges: numeric ranges in the format {a TO b} or [a TO b], for exclusive and inclusive ranges, respectively.

Purpose

This was developed for the purpose of being used internally in the main Troposphir, through lucene2sql.

Advanced Lucene features such as weights and fuzzy searches are unimplemented due to not being possible in naive SQL, and/or not used in the game’s search feature.

Usage

The main entry point of this crate is parse, which gives you a Term that you can match on or visit.

Example

let query = lucene_query_syntax::parse("name:\"Bob Ross\"")?;
println!("{query}");

Structs

Boundary

The limit of a range.

Enums

BoundaryKind

How to interpret the value of a boundary.

Operator

Describes how to combine the results of two terms.

Primitive

Value that is not composed of other values.

Term

An expression term.

Value

Anything that can be used as a search term value.

Functions

parse

Parses a given Lucene query into a syntax tree.