Add structured-merge-diff vendor

This is where most of the logic actually lives.

vendor/sigs.k8s.io/structured-merge-diff/value/value.go

@@ -0,0 +1,139 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+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 value
+
+import (
+	"fmt"
+	"strings"
+)
+
+// A Value is an object; it corresponds to an 'atom' in the schema.
+type Value struct {
+	// Exactly one of the below must be set.
+	FloatValue   *Float
+	IntValue     *Int
+	StringValue  *String
+	BooleanValue *Boolean
+	ListValue    *List
+	MapValue     *Map
+	Null         bool // represents an explicit `"foo" = null`
+}
+
+type Int int64
+type Float float64
+type String string
+type Boolean bool
+
+// Field is an individual key-value pair.
+type Field struct {
+	Name  string
+	Value Value
+}
+
+// List is a list of items.
+type List struct {
+	Items []Value
+}
+
+// Map is a map of key-value pairs. It represents both structs and maps. We use
+// a list and a go-language map to preserve order.
+//
+// Set and Get helpers are provided.
+type Map struct {
+	Items []Field
+
+	// may be nil; lazily constructed.
+	// TODO: Direct modifications to Items above will cause serious problems.
+	index map[string]*Field
+}
+
+// Get returns the (Field, true) or (nil, false) if it is not present
+func (m *Map) Get(key string) (*Field, bool) {
+	if m.index == nil {
+		m.index = map[string]*Field{}
+		for i := range m.Items {
+			f := &m.Items[i]
+			m.index[f.Name] = f
+		}
+	}
+	f, ok := m.index[key]
+	return f, ok
+}
+
+// Set inserts or updates the given item.
+func (m *Map) Set(key string, value Value) {
+	if f, ok := m.Get(key); ok {
+		f.Value = value
+		return
+	}
+	m.Items = append(m.Items, Field{Name: key, Value: value})
+	m.index = nil // Since the append might have reallocated
+}
+
+// StringValue returns s as a scalar string Value.
+func StringValue(s string) Value {
+	s2 := String(s)
+	return Value{StringValue: &s2}
+}
+
+// IntValue returns i as a scalar numeric (integer) Value.
+func IntValue(i int) Value {
+	i2 := Int(i)
+	return Value{IntValue: &i2}
+}
+
+// FloatValue returns f as a scalar numeric (float) Value.
+func FloatValue(f float64) Value {
+	f2 := Float(f)
+	return Value{FloatValue: &f2}
+}
+
+// BooleanValue returns b as a scalar boolean Value.
+func BooleanValue(b bool) Value {
+	b2 := Boolean(b)
+	return Value{BooleanValue: &b2}
+}
+
+// String returns a human-readable representation of the value.
+func (v Value) String() string {
+	switch {
+	case v.FloatValue != nil:
+		return fmt.Sprintf("%v", *v.FloatValue)
+	case v.IntValue != nil:
+		return fmt.Sprintf("%v", *v.IntValue)
+	case v.StringValue != nil:
+		return fmt.Sprintf("%q", *v.StringValue)
+	case v.BooleanValue != nil:
+		return fmt.Sprintf("%v", *v.BooleanValue)
+	case v.ListValue != nil:
+		strs := []string{}
+		for _, item := range v.ListValue.Items {
+			strs = append(strs, item.String())
+		}
+		return "[" + strings.Join(strs, ",") + "]"
+	case v.MapValue != nil:
+		strs := []string{}
+		for _, i := range v.MapValue.Items {
+			strs = append(strs, fmt.Sprintf("%v=%v", i.Name, i.Value))
+		}
+		return "{" + strings.Join(strs, ";") + "}"
+	default:
+		fallthrough
+	case v.Null == true:
+		return "null"
+	}
+}