github.com/containerd/containerd@v22.0.0-20200918172823-438c87b8e050+incompatible/cmd/protoc-gen-gogoctrd/customnameid.go (about)

     1  /*
     2     Copyright The containerd Authors.
     3  
     4     Licensed under the Apache License, Version 2.0 (the "License");
     5     you may not use this file except in compliance with the License.
     6     You may obtain a copy of the License at
     7  
     8         http://www.apache.org/licenses/LICENSE-2.0
     9  
    10     Unless required by applicable law or agreed to in writing, software
    11     distributed under the License is distributed on an "AS IS" BASIS,
    12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13     See the License for the specific language governing permissions and
    14     limitations under the License.
    15  */
    16  
    17  package main
    18  
    19  import (
    20  	"strings"
    21  
    22  	"github.com/gogo/protobuf/gogoproto"
    23  	"github.com/gogo/protobuf/proto"
    24  	"github.com/gogo/protobuf/protoc-gen-gogo/descriptor"
    25  	"github.com/gogo/protobuf/protoc-gen-gogo/generator"
    26  	"github.com/gogo/protobuf/vanity"
    27  )
    28  
    29  // CustomNameID preprocess the field, and set the [(gogoproto.customname) = "..."]
    30  // if necessary, in order to avoid setting `gogoproto.customname` manually.
    31  // The automatically assigned name should conform to Golang convention.
    32  func CustomNameID(file *descriptor.FileDescriptorProto) {
    33  
    34  	f := func(field *descriptor.FieldDescriptorProto) {
    35  		// Skip if [(gogoproto.customname) = "..."] has already been set.
    36  		if gogoproto.IsCustomName(field) {
    37  			return
    38  		}
    39  		// Skip if embedded
    40  		if gogoproto.IsEmbed(field) {
    41  			return
    42  		}
    43  		if field.OneofIndex != nil {
    44  			return
    45  		}
    46  		fieldName := generator.CamelCase(*field.Name)
    47  		switch {
    48  		case *field.Name == "id":
    49  			// id -> ID
    50  			fieldName = "ID"
    51  		case strings.HasPrefix(*field.Name, "id_"):
    52  			// id_some -> IDSome
    53  			fieldName = "ID" + fieldName[2:]
    54  		case strings.HasSuffix(*field.Name, "_id"):
    55  			// some_id -> SomeID
    56  			fieldName = fieldName[:len(fieldName)-2] + "ID"
    57  		case strings.HasSuffix(*field.Name, "_ids"):
    58  			// some_ids -> SomeIDs
    59  			fieldName = fieldName[:len(fieldName)-3] + "IDs"
    60  		default:
    61  			return
    62  		}
    63  		if field.Options == nil {
    64  			field.Options = &descriptor.FieldOptions{}
    65  		}
    66  		if err := proto.SetExtension(field.Options, gogoproto.E_Customname, &fieldName); err != nil {
    67  			panic(err)
    68  		}
    69  	}
    70  
    71  	// Iterate through all fields in file
    72  	vanity.ForEachFieldExcludingExtensions(file.MessageType, f)
    73  }