Adding upstream version 2.5.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

analysis/tokenmap/custom.go

@@ -0,0 +1,65 @@
+//  Copyright (c) 2014 Couchbase, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 		http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// package token_map implements a generic TokenMap, often used in conjunction
+// with filters to remove or process specific tokens.
+//
+// Its constructor takes the following arguments:
+//
+// "filename" (string): the path of a file listing the tokens. Each line may
+// contain one or more whitespace separated tokens, followed by an optional
+// comment starting with a "#" or "|" character.
+//
+// "tokens" ([]interface{}): if "filename" is not specified, tokens can be
+// passed directly as a sequence of strings wrapped in a []interface{}.
+package tokenmap
+
+import (
+	"fmt"
+
+	"github.com/blevesearch/bleve/v2/analysis"
+	"github.com/blevesearch/bleve/v2/registry"
+)
+
+const Name = "custom"
+
+func GenericTokenMapConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenMap, error) {
+	rv := analysis.NewTokenMap()
+
+	// first: try to load by filename
+	filename, ok := config["filename"].(string)
+	if ok {
+		err := rv.LoadFile(filename)
+		return rv, err
+	}
+	// next: look for an inline word list
+	tokens, ok := config["tokens"].([]interface{})
+	if ok {
+		for _, token := range tokens {
+			tokenStr, ok := token.(string)
+			if ok {
+				rv.AddToken(tokenStr)
+			}
+		}
+		return rv, nil
+	}
+	return nil, fmt.Errorf("must specify filename or list of tokens for token map")
+}
+
+func init() {
+	err := registry.RegisterTokenMap(Name, GenericTokenMapConstructor)
+	if err != nil {
+		panic(err)
+	}
+}