mirror of https://github.com/hashicorp/consul
113 lines
3.0 KiB
Go
113 lines
3.0 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: BUSL-1.1
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package generate
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import (
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"path"
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"strings"
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"google.golang.org/protobuf/compiler/protogen"
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"google.golang.org/protobuf/types/descriptorpb"
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)
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func Generate(gen *protogen.Plugin) error {
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for _, file := range gen.Files {
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if file.Generate != true {
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continue
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}
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if len(file.Messages) == 0 {
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continue
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}
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filename := file.GeneratedFilenamePrefix + "_json.gen.go"
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genFile := gen.NewGeneratedFile(filename, file.GoImportPath)
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genFile.P("// Code generated by protoc-json-shim. DO NOT EDIT.")
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genFile.P("package ", file.GoPackageName)
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var process func([]*protogen.Message)
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marshalerName := FileName(file) + "Marshaler"
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unmarshalerName := FileName(file) + "Unmarshaler"
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process = func(messages []*protogen.Message) {
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for _, message := range messages {
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// skip maps in protos.
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if message.Desc.Options().(*descriptorpb.MessageOptions).GetMapEntry() {
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continue
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}
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typeName := message.GoIdent.GoName
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genFile.P(`// MarshalJSON is a custom marshaler for `, typeName)
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genFile.P(`func (this *`, typeName, `) MarshalJSON() ([]byte, error) {`)
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genFile.P(`str, err := `, marshalerName, `.Marshal(this)`)
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genFile.P(`return []byte(str), err`)
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genFile.P(`}`)
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// Generate UnmarshalJSON() method for this type
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genFile.P(`// UnmarshalJSON is a custom unmarshaler for `, typeName)
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genFile.P(`func (this *`, typeName, `) UnmarshalJSON(b []byte) error {`)
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genFile.P(`return `, unmarshalerName, `.Unmarshal(b, this)`)
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genFile.P(`}`)
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process(message.Messages)
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}
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}
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process(file.Messages)
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// write out globals
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genFile.P(`var (`)
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genFile.P(marshalerName, ` = &`, protogen.GoIdent{GoName: "MarshalOptions", GoImportPath: "google.golang.org/protobuf/encoding/protojson"}, `{}`)
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genFile.P(unmarshalerName, ` = &`, protogen.GoIdent{GoName: "UnmarshalOptions", GoImportPath: "google.golang.org/protobuf/encoding/protojson"}, `{DiscardUnknown: false}`)
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genFile.P(`)`)
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}
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return nil
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}
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func FileName(file *protogen.File) string {
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fname := path.Base(file.Proto.GetName())
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fname = strings.Replace(fname, ".proto", "", -1)
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fname = strings.Replace(fname, "-", "_", -1)
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fname = strings.Replace(fname, ".", "_", -1)
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return toCamelInitCase(fname, true)
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}
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// Converts a string to CamelCase
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func toCamelInitCase(s string, initCase bool) string {
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s = strings.TrimSpace(s)
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if s == "" {
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return s
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}
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n := strings.Builder{}
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n.Grow(len(s))
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capNext := initCase
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prevIsCap := false
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for i, v := range []byte(s) {
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vIsCap := v >= 'A' && v <= 'Z'
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vIsLow := v >= 'a' && v <= 'z'
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if capNext {
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if vIsLow {
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v += 'A'
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v -= 'a'
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}
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} else if i == 0 {
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if vIsCap {
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v += 'a'
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v -= 'A'
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}
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} else if prevIsCap && vIsCap {
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v += 'a'
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v -= 'A'
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}
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prevIsCap = vIsCap
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if vIsCap || vIsLow {
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n.WriteByte(v)
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capNext = false
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} else if vIsNum := v >= '0' && v <= '9'; vIsNum {
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n.WriteByte(v)
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capNext = true
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} else {
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capNext = v == '_' || v == ' ' || v == '-' || v == '.'
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}
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}
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return n.String()
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}
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