Adding upstream version 2.5.1.

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

analysis/lang/es/spanish_normalize.go

@@ -0,0 +1,70 @@
+//  Copyright (c) 2017 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 es
+
+import (
+	"bytes"
+
+	"github.com/blevesearch/bleve/v2/analysis"
+	"github.com/blevesearch/bleve/v2/registry"
+)
+
+const NormalizeName = "normalize_es"
+
+type SpanishNormalizeFilter struct {
+}
+
+func NewSpanishNormalizeFilter() *SpanishNormalizeFilter {
+	return &SpanishNormalizeFilter{}
+}
+
+func (s *SpanishNormalizeFilter) Filter(input analysis.TokenStream) analysis.TokenStream {
+	for _, token := range input {
+		term := normalize(token.Term)
+		token.Term = term
+	}
+	return input
+}
+
+func normalize(input []byte) []byte {
+	runes := bytes.Runes(input)
+	for i := 0; i < len(runes); i++ {
+		switch runes[i] {
+		case 'à', 'á', 'â', 'ä':
+			runes[i] = 'a'
+		case 'ò', 'ó', 'ô', 'ö':
+			runes[i] = 'o'
+		case 'è', 'é', 'ê', 'ë':
+			runes[i] = 'e'
+		case 'ù', 'ú', 'û', 'ü':
+			runes[i] = 'u'
+		case 'ì', 'í', 'î', 'ï':
+			runes[i] = 'i'
+		}
+	}
+
+	return analysis.BuildTermFromRunes(runes)
+}
+
+func NormalizerFilterConstructor(config map[string]interface{}, cache *registry.Cache) (analysis.TokenFilter, error) {
+	return NewSpanishNormalizeFilter(), nil
+}
+
+func init() {
+	err := registry.RegisterTokenFilter(NormalizeName, NormalizerFilterConstructor)
+	if err != nil {
+		panic(err)
+	}
+}