Adding upstream version 2.5.1.

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

search/highlight/format/ansi/ansi.go

@@ -0,0 +1,112 @@
+//  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 ansi
+
+import (
+	"github.com/blevesearch/bleve/v2/registry"
+	"github.com/blevesearch/bleve/v2/search/highlight"
+)
+
+const Name = "ansi"
+
+const DefaultAnsiHighlight = BgYellow
+
+type FragmentFormatter struct {
+	color string
+}
+
+func NewFragmentFormatter(color string) *FragmentFormatter {
+	return &FragmentFormatter{
+		color: color,
+	}
+}
+
+func (a *FragmentFormatter) Format(f *highlight.Fragment, orderedTermLocations highlight.TermLocations) string {
+	rv := ""
+	curr := f.Start
+	for _, termLocation := range orderedTermLocations {
+		if termLocation == nil {
+			continue
+		}
+		// make sure the array positions match
+		if !termLocation.ArrayPositions.Equals(f.ArrayPositions) {
+			continue
+		}
+		if termLocation.Start < curr {
+			continue
+		}
+		if termLocation.End > f.End {
+			break
+		}
+		// add the stuff before this location
+		rv += string(f.Orig[curr:termLocation.Start])
+		// add the color
+		rv += a.color
+		// add the term itself
+		rv += string(f.Orig[termLocation.Start:termLocation.End])
+		// reset the color
+		rv += Reset
+		// update current
+		curr = termLocation.End
+	}
+	// add any remaining text after the last token
+	rv += string(f.Orig[curr:f.End])
+
+	return rv
+}
+
+// ANSI color control escape sequences.
+// Shamelessly copied from https://github.com/sqp/godock/blob/master/libs/log/colors.go
+const (
+	Reset      = "\x1b[0m"
+	Bright     = "\x1b[1m"
+	Dim        = "\x1b[2m"
+	Underscore = "\x1b[4m"
+	Blink      = "\x1b[5m"
+	Reverse    = "\x1b[7m"
+	Hidden     = "\x1b[8m"
+	FgBlack    = "\x1b[30m"
+	FgRed      = "\x1b[31m"
+	FgGreen    = "\x1b[32m"
+	FgYellow   = "\x1b[33m"
+	FgBlue     = "\x1b[34m"
+	FgMagenta  = "\x1b[35m"
+	FgCyan     = "\x1b[36m"
+	FgWhite    = "\x1b[37m"
+	BgBlack    = "\x1b[40m"
+	BgRed      = "\x1b[41m"
+	BgGreen    = "\x1b[42m"
+	BgYellow   = "\x1b[43m"
+	BgBlue     = "\x1b[44m"
+	BgMagenta  = "\x1b[45m"
+	BgCyan     = "\x1b[46m"
+	BgWhite    = "\x1b[47m"
+)
+
+func Constructor(config map[string]interface{}, cache *registry.Cache) (highlight.FragmentFormatter, error) {
+	color := DefaultAnsiHighlight
+	colorVal, ok := config["color"].(string)
+	if ok {
+		color = colorVal
+	}
+	return NewFragmentFormatter(color), nil
+}
+
+func init() {
+	err := registry.RegisterFragmentFormatter(Name, Constructor)
+	if err != nil {
+		panic(err)
+	}
+}