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author | appilon <apilon@hashicorp.com> | 2019-02-27 16:43:31 -0500 |
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committer | GitHub <noreply@github.com> | 2019-02-27 16:43:31 -0500 |
commit | 844b5a68d8af4791755b8f0ad293cc99f5959183 (patch) | |
tree | 255c250a5c9d4801c74092d33b7337d8c14438ff /vendor/github.com/golang/protobuf/proto/clone.go | |
parent | 303b299eeb6b06e939e35905e4b34cb410dd9dc3 (diff) | |
parent | 15c0b25d011f37e7c20aeca9eaf461f78285b8d9 (diff) | |
download | terraform-provider-statuscake-844b5a68d8af4791755b8f0ad293cc99f5959183.tar.gz terraform-provider-statuscake-844b5a68d8af4791755b8f0ad293cc99f5959183.tar.zst terraform-provider-statuscake-844b5a68d8af4791755b8f0ad293cc99f5959183.zip |
Merge pull request #27 from terraform-providers/go-modules-2019-02-22
[MODULES] Switch to Go Modules
Diffstat (limited to 'vendor/github.com/golang/protobuf/proto/clone.go')
-rw-r--r-- | vendor/github.com/golang/protobuf/proto/clone.go | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/vendor/github.com/golang/protobuf/proto/clone.go b/vendor/github.com/golang/protobuf/proto/clone.go new file mode 100644 index 0000000..3cd3249 --- /dev/null +++ b/vendor/github.com/golang/protobuf/proto/clone.go | |||
@@ -0,0 +1,253 @@ | |||
1 | // Go support for Protocol Buffers - Google's data interchange format | ||
2 | // | ||
3 | // Copyright 2011 The Go Authors. All rights reserved. | ||
4 | // https://github.com/golang/protobuf | ||
5 | // | ||
6 | // Redistribution and use in source and binary forms, with or without | ||
7 | // modification, are permitted provided that the following conditions are | ||
8 | // met: | ||
9 | // | ||
10 | // * Redistributions of source code must retain the above copyright | ||
11 | // notice, this list of conditions and the following disclaimer. | ||
12 | // * Redistributions in binary form must reproduce the above | ||
13 | // copyright notice, this list of conditions and the following disclaimer | ||
14 | // in the documentation and/or other materials provided with the | ||
15 | // distribution. | ||
16 | // * Neither the name of Google Inc. nor the names of its | ||
17 | // contributors may be used to endorse or promote products derived from | ||
18 | // this software without specific prior written permission. | ||
19 | // | ||
20 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
21 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
22 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
23 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
24 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
25 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
26 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
27 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
28 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
29 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
30 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
31 | |||
32 | // Protocol buffer deep copy and merge. | ||
33 | // TODO: RawMessage. | ||
34 | |||
35 | package proto | ||
36 | |||
37 | import ( | ||
38 | "fmt" | ||
39 | "log" | ||
40 | "reflect" | ||
41 | "strings" | ||
42 | ) | ||
43 | |||
44 | // Clone returns a deep copy of a protocol buffer. | ||
45 | func Clone(src Message) Message { | ||
46 | in := reflect.ValueOf(src) | ||
47 | if in.IsNil() { | ||
48 | return src | ||
49 | } | ||
50 | out := reflect.New(in.Type().Elem()) | ||
51 | dst := out.Interface().(Message) | ||
52 | Merge(dst, src) | ||
53 | return dst | ||
54 | } | ||
55 | |||
56 | // Merger is the interface representing objects that can merge messages of the same type. | ||
57 | type Merger interface { | ||
58 | // Merge merges src into this message. | ||
59 | // Required and optional fields that are set in src will be set to that value in dst. | ||
60 | // Elements of repeated fields will be appended. | ||
61 | // | ||
62 | // Merge may panic if called with a different argument type than the receiver. | ||
63 | Merge(src Message) | ||
64 | } | ||
65 | |||
66 | // generatedMerger is the custom merge method that generated protos will have. | ||
67 | // We must add this method since a generate Merge method will conflict with | ||
68 | // many existing protos that have a Merge data field already defined. | ||
69 | type generatedMerger interface { | ||
70 | XXX_Merge(src Message) | ||
71 | } | ||
72 | |||
73 | // Merge merges src into dst. | ||
74 | // Required and optional fields that are set in src will be set to that value in dst. | ||
75 | // Elements of repeated fields will be appended. | ||
76 | // Merge panics if src and dst are not the same type, or if dst is nil. | ||
77 | func Merge(dst, src Message) { | ||
78 | if m, ok := dst.(Merger); ok { | ||
79 | m.Merge(src) | ||
80 | return | ||
81 | } | ||
82 | |||
83 | in := reflect.ValueOf(src) | ||
84 | out := reflect.ValueOf(dst) | ||
85 | if out.IsNil() { | ||
86 | panic("proto: nil destination") | ||
87 | } | ||
88 | if in.Type() != out.Type() { | ||
89 | panic(fmt.Sprintf("proto.Merge(%T, %T) type mismatch", dst, src)) | ||
90 | } | ||
91 | if in.IsNil() { | ||
92 | return // Merge from nil src is a noop | ||
93 | } | ||
94 | if m, ok := dst.(generatedMerger); ok { | ||
95 | m.XXX_Merge(src) | ||
96 | return | ||
97 | } | ||
98 | mergeStruct(out.Elem(), in.Elem()) | ||
99 | } | ||
100 | |||
101 | func mergeStruct(out, in reflect.Value) { | ||
102 | sprop := GetProperties(in.Type()) | ||
103 | for i := 0; i < in.NumField(); i++ { | ||
104 | f := in.Type().Field(i) | ||
105 | if strings.HasPrefix(f.Name, "XXX_") { | ||
106 | continue | ||
107 | } | ||
108 | mergeAny(out.Field(i), in.Field(i), false, sprop.Prop[i]) | ||
109 | } | ||
110 | |||
111 | if emIn, err := extendable(in.Addr().Interface()); err == nil { | ||
112 | emOut, _ := extendable(out.Addr().Interface()) | ||
113 | mIn, muIn := emIn.extensionsRead() | ||
114 | if mIn != nil { | ||
115 | mOut := emOut.extensionsWrite() | ||
116 | muIn.Lock() | ||
117 | mergeExtension(mOut, mIn) | ||
118 | muIn.Unlock() | ||
119 | } | ||
120 | } | ||
121 | |||
122 | uf := in.FieldByName("XXX_unrecognized") | ||
123 | if !uf.IsValid() { | ||
124 | return | ||
125 | } | ||
126 | uin := uf.Bytes() | ||
127 | if len(uin) > 0 { | ||
128 | out.FieldByName("XXX_unrecognized").SetBytes(append([]byte(nil), uin...)) | ||
129 | } | ||
130 | } | ||
131 | |||
132 | // mergeAny performs a merge between two values of the same type. | ||
133 | // viaPtr indicates whether the values were indirected through a pointer (implying proto2). | ||
134 | // prop is set if this is a struct field (it may be nil). | ||
135 | func mergeAny(out, in reflect.Value, viaPtr bool, prop *Properties) { | ||
136 | if in.Type() == protoMessageType { | ||
137 | if !in.IsNil() { | ||
138 | if out.IsNil() { | ||
139 | out.Set(reflect.ValueOf(Clone(in.Interface().(Message)))) | ||
140 | } else { | ||
141 | Merge(out.Interface().(Message), in.Interface().(Message)) | ||
142 | } | ||
143 | } | ||
144 | return | ||
145 | } | ||
146 | switch in.Kind() { | ||
147 | case reflect.Bool, reflect.Float32, reflect.Float64, reflect.Int32, reflect.Int64, | ||
148 | reflect.String, reflect.Uint32, reflect.Uint64: | ||
149 | if !viaPtr && isProto3Zero(in) { | ||
150 | return | ||
151 | } | ||
152 | out.Set(in) | ||
153 | case reflect.Interface: | ||
154 | // Probably a oneof field; copy non-nil values. | ||
155 | if in.IsNil() { | ||
156 | return | ||
157 | } | ||
158 | // Allocate destination if it is not set, or set to a different type. | ||
159 | // Otherwise we will merge as normal. | ||
160 | if out.IsNil() || out.Elem().Type() != in.Elem().Type() { | ||
161 | out.Set(reflect.New(in.Elem().Elem().Type())) // interface -> *T -> T -> new(T) | ||
162 | } | ||
163 | mergeAny(out.Elem(), in.Elem(), false, nil) | ||
164 | case reflect.Map: | ||
165 | if in.Len() == 0 { | ||
166 | return | ||
167 | } | ||
168 | if out.IsNil() { | ||
169 | out.Set(reflect.MakeMap(in.Type())) | ||
170 | } | ||
171 | // For maps with value types of *T or []byte we need to deep copy each value. | ||
172 | elemKind := in.Type().Elem().Kind() | ||
173 | for _, key := range in.MapKeys() { | ||
174 | var val reflect.Value | ||
175 | switch elemKind { | ||
176 | case reflect.Ptr: | ||
177 | val = reflect.New(in.Type().Elem().Elem()) | ||
178 | mergeAny(val, in.MapIndex(key), false, nil) | ||
179 | case reflect.Slice: | ||
180 | val = in.MapIndex(key) | ||
181 | val = reflect.ValueOf(append([]byte{}, val.Bytes()...)) | ||
182 | default: | ||
183 | val = in.MapIndex(key) | ||
184 | } | ||
185 | out.SetMapIndex(key, val) | ||
186 | } | ||
187 | case reflect.Ptr: | ||
188 | if in.IsNil() { | ||
189 | return | ||
190 | } | ||
191 | if out.IsNil() { | ||
192 | out.Set(reflect.New(in.Elem().Type())) | ||
193 | } | ||
194 | mergeAny(out.Elem(), in.Elem(), true, nil) | ||
195 | case reflect.Slice: | ||
196 | if in.IsNil() { | ||
197 | return | ||
198 | } | ||
199 | if in.Type().Elem().Kind() == reflect.Uint8 { | ||
200 | // []byte is a scalar bytes field, not a repeated field. | ||
201 | |||
202 | // Edge case: if this is in a proto3 message, a zero length | ||
203 | // bytes field is considered the zero value, and should not | ||
204 | // be merged. | ||
205 | if prop != nil && prop.proto3 && in.Len() == 0 { | ||
206 | return | ||
207 | } | ||
208 | |||
209 | // Make a deep copy. | ||
210 | // Append to []byte{} instead of []byte(nil) so that we never end up | ||
211 | // with a nil result. | ||
212 | out.SetBytes(append([]byte{}, in.Bytes()...)) | ||
213 | return | ||
214 | } | ||
215 | n := in.Len() | ||
216 | if out.IsNil() { | ||
217 | out.Set(reflect.MakeSlice(in.Type(), 0, n)) | ||
218 | } | ||
219 | switch in.Type().Elem().Kind() { | ||
220 | case reflect.Bool, reflect.Float32, reflect.Float64, reflect.Int32, reflect.Int64, | ||
221 | reflect.String, reflect.Uint32, reflect.Uint64: | ||
222 | out.Set(reflect.AppendSlice(out, in)) | ||
223 | default: | ||
224 | for i := 0; i < n; i++ { | ||
225 | x := reflect.Indirect(reflect.New(in.Type().Elem())) | ||
226 | mergeAny(x, in.Index(i), false, nil) | ||
227 | out.Set(reflect.Append(out, x)) | ||
228 | } | ||
229 | } | ||
230 | case reflect.Struct: | ||
231 | mergeStruct(out, in) | ||
232 | default: | ||
233 | // unknown type, so not a protocol buffer | ||
234 | log.Printf("proto: don't know how to copy %v", in) | ||
235 | } | ||
236 | } | ||
237 | |||
238 | func mergeExtension(out, in map[int32]Extension) { | ||
239 | for extNum, eIn := range in { | ||
240 | eOut := Extension{desc: eIn.desc} | ||
241 | if eIn.value != nil { | ||
242 | v := reflect.New(reflect.TypeOf(eIn.value)).Elem() | ||
243 | mergeAny(v, reflect.ValueOf(eIn.value), false, nil) | ||
244 | eOut.value = v.Interface() | ||
245 | } | ||
246 | if eIn.enc != nil { | ||
247 | eOut.enc = make([]byte, len(eIn.enc)) | ||
248 | copy(eOut.enc, eIn.enc) | ||
249 | } | ||
250 | |||
251 | out[extNum] = eOut | ||
252 | } | ||
253 | } | ||