71 lines
1.6 KiB
Go
71 lines
1.6 KiB
Go
// Copyright (c) 2018 Couchbase, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package stempel
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import (
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"bytes"
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_ "embed"
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"github.com/blevesearch/stempel/javadata"
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"io"
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"os"
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"strings"
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)
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//go:embed pl/stemmer_20000.tbl
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var stempelFile []byte
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// Trie is the external interface to work with the stempel trie
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type Trie interface {
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GetLastOnPath([]rune) []rune
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}
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// Open attempts to open a file at the specified path, and use it to
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// build a Trie
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func Open(path string) (Trie, error) {
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f, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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return buildTrieFromReader(f)
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}
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// LoadTrie load trie from embed file
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func LoadTrie() (Trie, error) {
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return buildTrieFromReader(bytes.NewReader(stempelFile))
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}
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// buildTrieFromReader build trie from io.Reader
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func buildTrieFromReader(f io.Reader) (Trie, error) {
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r := javadata.NewReader(f)
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method, err := r.ReadUTF()
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if err != nil {
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return nil, err
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}
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var rv Trie
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if strings.Contains(method, "M") {
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rv, err = newMultiTrie(r)
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if err != nil {
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return nil, err
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}
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} else {
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rv, err = newTrie(r)
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if err != nil {
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return nil, err
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}
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}
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return rv, nil
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}
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