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Updated tokenizer to better matching when search for code snippets (#32261)

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This PR improves the accuracy of Gitea's code search. 

Currently, Gitea does not consider statements such as
`onsole.log("hello")` as hits when the user searches for `log`. The
culprit is how both ES and Bleve are tokenizing the file contents (in
both cases, `console.log` is a whole token).

In ES' case, we changed the tokenizer to
[simple_pattern_split](https://www.elastic.co/guide/en/elasticsearch/reference/current/analysis-simplepatternsplit-tokenizer.html#:~:text=The%20simple_pattern_split%20tokenizer%20uses%20a,the%20tokenization%20is%20generally%20faster.).
In such a case, tokens are words formed by digits and letters. In
Bleve's case, it employs a
[letter](https://blevesearch.com/docs/Tokenizers/) tokenizer.

Resolves #32220

---------

Signed-off-by: Bruno Sofiato <bruno.sofiato@gmail.com>
This commit is contained in:
Bruno Sofiato 2024-11-06 17:51:20 -03:00 • committed by GitHub
parent b573512312
commit f64fbd9b74
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17 changed files with 83 additions and 12 deletions
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5
modules/indexer/code/bleve/bleve.go
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@ -31,6 +31,7 @@ import (
"github.com/blevesearch/bleve/v2/analysis/token/camelcase"
"github.com/blevesearch/bleve/v2/analysis/token/lowercase"
"github.com/blevesearch/bleve/v2/analysis/token/unicodenorm"
"github.com/blevesearch/bleve/v2/analysis/tokenizer/letter"
"github.com/blevesearch/bleve/v2/analysis/tokenizer/unicode"
"github.com/blevesearch/bleve/v2/mapping"
"github.com/blevesearch/bleve/v2/search/query"
@ -69,7 +70,7 @@ const (
filenameIndexerAnalyzer = "filenameIndexerAnalyzer"
filenameIndexerTokenizer = "filenameIndexerTokenizer"
repoIndexerDocType = "repoIndexerDocType"
repoIndexerLatestVersion = 7
repoIndexerLatestVersion = 8
)
// generateBleveIndexMapping generates a bleve index mapping for the repo indexer
@ -105,7 +106,7 @@ func generateBleveIndexMapping() (mapping.IndexMapping, error) {
} else if err := mapping.AddCustomAnalyzer(repoIndexerAnalyzer, map[string]any{
"type": analyzer_custom.Name,
"char_filters": []string{},
"tokenizer": unicode.Name,
"tokenizer": letter.Name,
"token_filters": []string{unicodeNormalizeName, camelcase.Name, lowercase.Name},
}); err != nil {
return nil, err