mirror of
https://github.com/meilisearch/meilisearch.git
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98 lines
2.8 KiB
Rust
98 lines
2.8 KiB
Rust
#[macro_use] extern crate lazy_static;
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pub mod rank;
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pub mod metadata;
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pub mod vec_read_only;
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pub mod automaton;
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pub mod tokenizer;
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pub use self::metadata::{Metadata, MetadataBuilder};
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pub use self::rank::RankedStream;
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pub type DocumentId = u64;
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/// This structure represent the position of a word
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/// in a document and its attributes.
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///
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/// This is stored in the map, generated at index time,
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/// extracted and interpreted at search time.
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#[derive(Debug, Copy, Clone, Eq, PartialEq, PartialOrd, Ord, Hash)]
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#[repr(C)]
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pub struct DocIndex {
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/// The document identifier where the word was found.
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pub document: DocumentId,
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/// The attribute identifier in the document
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/// where the word was found.
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///
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/// This is an `u8` therefore a document
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/// can not have more than `2^8` attributes.
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pub attribute: u8,
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/// The index where the word was found in the attribute.
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///
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/// Only the first 1000 words are indexed.
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pub attribute_index: u32,
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}
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/// This structure represent a matching word with informations
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/// on the location of the word in the document.
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///
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/// The order of the field is important because it defines
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/// the way these structures are ordered between themselves.
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///
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/// The word in itself is not important.
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// TODO do data oriented programming ? very arrays ?
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#[derive(Debug, Copy, Clone, Eq, PartialEq, PartialOrd, Ord, Hash)]
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pub struct Match {
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/// The word index in the query sentence.
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/// Same as the `attribute_index` but for the query words.
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///
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/// Used to retrieve the automaton that match this word.
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pub query_index: u32,
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/// The distance the word has with the query word
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/// (i.e. the Levenshtein distance).
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pub distance: u8,
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/// The attribute in which the word is located
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/// (i.e. Title is 0, Description is 1).
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///
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/// This is an `u8` therefore a document
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/// can not have more than `2^8` attributes.
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pub attribute: u8,
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/// Where does this word is located in the attribute string
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/// (i.e. at the start or the end of the attribute).
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///
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/// The index in the attribute is limited to a maximum of `2^32`
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/// this is because we index only the first 1000 words
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/// in an attribute.
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pub attribute_index: u32,
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/// Whether the word that match is an exact match or a prefix.
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pub is_exact: bool,
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}
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impl Match {
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pub fn zero() -> Self {
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Match {
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query_index: 0,
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distance: 0,
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attribute: 0,
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attribute_index: 0,
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is_exact: false,
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}
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}
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pub fn max() -> Self {
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Match {
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query_index: u32::max_value(),
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distance: u8::max_value(),
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attribute: u8::max_value(),
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attribute_index: u32::max_value(),
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is_exact: true,
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}
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}
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}
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