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Handle distance addition with hard separators

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many 2021-08-25 15:09:46 +02:00
parent fc7cc770d4
commit e09eec37bc
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GPG Key ID: 2CEF23B75189EACA
1 changed files with 37 additions and 6 deletions
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43
milli/src/update/index_documents/extract/extract_docid_word_positions.rs
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@ -3,7 +3,8 @@ use std::convert::TryInto;
use std::fs::File;
use std::{io, mem, str};
use meilisearch_tokenizer::{Analyzer, AnalyzerConfig, Token};
use meilisearch_tokenizer::token::SeparatorKind;
use meilisearch_tokenizer::{Analyzer, AnalyzerConfig, Token, TokenKind};
use roaring::RoaringBitmap;
use serde_json::Value;
@ -61,11 +62,8 @@ pub fn extract_docid_word_positions<R: io::Read>(
field_buffer.clear();
if let Some(field) = json_to_string(&value, &mut field_buffer) {
let analyzed = analyzer.analyze(field);
let tokens = analyzed
.tokens()
.filter(Token::is_word)
.enumerate()
.take_while(|(i, _)| (*i as u32) < ONE_ATTRIBUTE);
let tokens = process_tokens(analyzed.tokens())
.take_while(|(p, _)| (*p as u32) < ONE_ATTRIBUTE);
for (index, token) in tokens {
let token = token.text().trim();
@ -134,3 +132,36 @@ fn json_to_string<'a>(value: &'a Value, buffer: &'a mut String) -> Option<&'a st
None
}
}
/// take an iterator on tokens and compute their relative position depending on separator kinds
/// if it's an `Hard` separator we add an additional relative proximity of 8 between words,
/// else we keep the standart proximity of 1 between words.
fn process_tokens<'a>(
tokens: impl Iterator<Item = Token<'a>>,
) -> impl Iterator<Item = (usize, Token<'a>)> {
tokens
.skip_while(|token| token.is_separator().is_some())
.scan((0, None), |(offset, prev_kind), token| {
match token.kind {
TokenKind::Word | TokenKind::StopWord | TokenKind::Unknown => {
*offset += match *prev_kind {
Some(TokenKind::Separator(SeparatorKind::Hard)) => 8,
Some(_) => 1,
None => 0,
};
*prev_kind = Some(token.kind)
}
TokenKind::Separator(SeparatorKind::Hard) => {
*prev_kind = Some(token.kind);
}
TokenKind::Separator(SeparatorKind::Soft)
if *prev_kind != Some(TokenKind::Separator(SeparatorKind::Hard)) =>
{
*prev_kind = Some(token.kind);
}
_ => (),
}
Some((*offset, token))
})
.filter(|(_, t)| t.is_word())
}