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Signed-off-by: Bruno Sofiato <bruno.sofiato@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| // Copyright 2019 The Gitea Authors. All rights reserved. | ||
| // SPDX-License-Identifier: MIT | ||
|
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| package path | ||
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| import ( | ||
| "slices" | ||
| "strings" | ||
|
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| "github.com/blevesearch/bleve/v2/analysis" | ||
| "github.com/blevesearch/bleve/v2/registry" | ||
| ) | ||
|
|
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| const ( | ||
| Name = "gitea/path" | ||
| ) | ||
|
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| type TokenFilter struct{} | ||
|
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| func NewTokenFilter() *TokenFilter { | ||
| return &TokenFilter{} | ||
| } | ||
|
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| func TokenFilterConstructor(config map[string]any, cache *registry.Cache) (analysis.TokenFilter, error) { | ||
| return NewTokenFilter(), nil | ||
| } | ||
|
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| func (s *TokenFilter) Filter(input analysis.TokenStream) analysis.TokenStream { | ||
| if len(input) == 1 { | ||
| // if there is only one token, we dont need to generate the reversed chain | ||
| return generatePathTokens(input, false) | ||
| } | ||
|
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| normal := generatePathTokens(input, false) | ||
| reversed := generatePathTokens(input, true) | ||
|
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| return append(normal, reversed...) | ||
| } | ||
|
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| // Generates path tokens from the input tokens. | ||
| // This mimics the behavior of the path hierarchy tokenizer in ES. It takes the input tokens and combine them, generating a term for each component | ||
| // in tree (e.g., foo/bar/baz.md will generate foo, foo/bar, and foo/bar/baz.md). | ||
| // | ||
| // If the reverse flag is set, the order of the tokens is reversed (the same input will generate baz.md, baz.md/bar, baz.md/bar/foo). This is useful | ||
| // to efficently search for filenames without supplying the fullpath. | ||
| func generatePathTokens(input analysis.TokenStream, reversed bool) analysis.TokenStream { | ||
| terms := make([]string, 0, len(input)) | ||
| longestTerm := 0 | ||
|
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| if reversed { | ||
| slices.Reverse(input) | ||
| } | ||
|
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| for i := 0; i < len(input); i++ { | ||
| var sb strings.Builder | ||
| sb.WriteString(string(input[0].Term)) | ||
|
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| for j := 1; j < i; j++ { | ||
| sb.WriteString("/") | ||
| sb.WriteString(string(input[j].Term)) | ||
| } | ||
|
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| term := sb.String() | ||
|
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| if longestTerm < len(term) { | ||
| longestTerm = len(term) | ||
| } | ||
|
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| terms = append(terms, term) | ||
| } | ||
|
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| output := make(analysis.TokenStream, 0, len(terms)) | ||
|
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| for _, term := range terms { | ||
| var start, end int | ||
|
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| if reversed { | ||
| start = 0 | ||
| end = len(term) | ||
| } else { | ||
| start = longestTerm - len(term) | ||
| end = longestTerm | ||
| } | ||
|
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| token := analysis.Token{ | ||
| Position: 1, | ||
| Start: start, | ||
| End: end, | ||
| Type: analysis.AlphaNumeric, | ||
| Term: []byte(term), | ||
| } | ||
|
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| output = append(output, &token) | ||
| } | ||
|
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| return output | ||
| } | ||
|
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| func init() { | ||
| registry.RegisterTokenFilter(Name, TokenFilterConstructor) | ||
| } | ||
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