Adding upstream version 2.5.1.

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

analysis/char/zerowidthnonjoiner/zerowidthnonjoiner.go

@@ -0,0 +1,39 @@
+//  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 zerowidthnonjoiner
+
+import (
+	"regexp"
+
+	"github.com/blevesearch/bleve/v2/analysis"
+	regexpCharFilter "github.com/blevesearch/bleve/v2/analysis/char/regexp"
+	"github.com/blevesearch/bleve/v2/registry"
+)
+
+const Name = "zero_width_spaces"
+
+var zeroWidthNonJoinerRegexp = regexp.MustCompile(`\x{200C}`)
+
+func CharFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.CharFilter, error) {
+	replaceBytes := []byte(" ")
+	return regexpCharFilter.New(zeroWidthNonJoinerRegexp, replaceBytes), nil
+}
+
+func init() {
+	err := registry.RegisterCharFilter(Name, CharFilterConstructor)
+	if err != nil {
+		panic(err)
+	}
+}