Checking in vendor folder for ease of using go get.

vendor/golang.org/x/text/internal/cldrtree/option.go

@@ -0,0 +1,86 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package cldrtree
+
+import (
+	"reflect"
+
+	"golang.org/x/text/unicode/cldr"
+)
+
+// An Option configures an Index.
+type Option func(*options)
+
+type options struct {
+	parent *Index
+
+	name  string
+	alias *cldr.Common
+
+	sharedType  *typeInfo
+	sharedEnums *enum
+}
+
+func (o *options) fill(opt []Option) {
+	for _, f := range opt {
+		f(o)
+	}
+}
+
+// aliasOpt sets an alias from the given node, if the node defines one.
+func (o *options) setAlias(n Element) {
+	if n != nil && !reflect.ValueOf(n).IsNil() {
+		o.alias = n.GetCommon()
+	}
+}
+
+// Enum defines a enumeration type. The resulting option may be passed for the
+// construction of multiple Indexes, which they will share the same enum values.
+// Calling Gen on a Builder will generate the Enum for the given name. The
+// optional values fix the values for the given identifier to the argument
+// position (starting at 0). Other values may still be added and will be
+// assigned to subsequent values.
+func Enum(name string, value ...string) Option {
+	return EnumFunc(name, nil, value...)
+}
+
+// EnumFunc is like Enum but also takes a function that allows rewriting keys.
+func EnumFunc(name string, rename func(string) string, value ...string) Option {
+	enum := &enum{name: name, rename: rename, keyMap: map[string]enumIndex{}}
+	for _, e := range value {
+		enum.lookup(e)
+	}
+	return func(o *options) {
+		found := false
+		for _, e := range o.parent.meta.b.enums {
+			if e.name == enum.name {
+				found = true
+				break
+			}
+		}
+		if !found {
+			o.parent.meta.b.enums = append(o.parent.meta.b.enums, enum)
+		}
+		o.sharedEnums = enum
+	}
+}
+
+// SharedType returns an option which causes all Indexes to which this option is
+// passed to have the same type.
+func SharedType() Option {
+	info := &typeInfo{}
+	return func(o *options) { o.sharedType = info }
+}
+
+func useSharedType() Option {
+	return func(o *options) {
+		sub := o.parent.meta.typeInfo.keyTypeInfo
+		if sub == nil {
+			sub = &typeInfo{}
+			o.parent.meta.typeInfo.keyTypeInfo = sub
+		}
+		o.sharedType = sub
+	}
+}