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message_json.go
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message_json.go
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package shared
import (
"bytes"
"encoding/json"
"fmt"
"strings"
pgs "github.com/lyft/protoc-gen-star"
)
func (fns Funcs) enumJSON(enum pgs.Enum) string {
var val []string
for _, v := range enum.Values() {
val = append(val, fmt.Sprintf("%d (%s)", v.Value(), v.Name().String()))
}
return strings.Join(val, " | ")
}
func (fns Funcs) fieldElementJSON(el pgs.FieldTypeElem, messages map[string]int, mapKey bool) string {
if el.IsEmbed() {
messages[el.Embed().FullyQualifiedName()]++
return fns.messageJSON(el.Embed(), messages)
} else if el.IsEnum() {
if el.Enum().FullyQualifiedName() == ".google.protobuf.NullValue" {
return "null"
}
return fmt.Sprintf(`"%s"`, fns.enumJSON(el.Enum()))
}
switch el.ProtoType() {
case pgs.DoubleT, pgs.FloatT:
if mapKey {
return `"3.1415926"`
} else {
return "3.1415926"
}
case pgs.Int64T, pgs.UInt64T, pgs.SInt64, pgs.Fixed64T, pgs.SFixed64:
return `"string($int64)"`
case pgs.Int32T, pgs.UInt32T, pgs.Fixed32T, pgs.SInt32, pgs.SFixed32:
if mapKey {
return `"0"`
} else {
return "0"
}
case pgs.BoolT:
if mapKey {
return `"true"`
} else {
return "true"
}
case pgs.StringT:
return `"string"`
case pgs.BytesT:
return `"YmFzZTY0IHN0cmluZw=="`
default:
return `"UNKNOWN"`
}
}
func (fns Funcs) fieldJSON(field pgs.Field, messages map[string]int) string {
switch field.Type().ProtoType() {
case pgs.DoubleT, pgs.FloatT:
return `3.1415926`
case pgs.Int64T, pgs.UInt64T, pgs.SInt64, pgs.Fixed64T, pgs.SFixed64:
return `"string($int64)"`
case pgs.Int32T, pgs.UInt32T, pgs.Fixed32T, pgs.SInt32, pgs.SFixed32:
return "0"
case pgs.BoolT:
return "true"
case pgs.StringT:
return `"string"`
case pgs.BytesT:
return `"YmFzZTY0IHN0cmluZw=="`
case pgs.EnumT:
var enum pgs.Enum
if field.Type().IsRepeated() {
enum = field.Type().Element().Enum()
} else {
enum = field.Type().Enum()
}
if enum.FullyQualifiedName() == ".google.protobuf.NullValue" {
return "null"
}
return fmt.Sprintf(`"%s"`, fns.enumJSON(enum))
case pgs.MessageT:
if field.Type().IsMap() {
key := fns.fieldElementJSON(field.Type().Key(), messages, true)
value := fns.fieldElementJSON(field.Type().Element(), messages, false)
return fmt.Sprintf(`{%s:%s}`, key, value)
} else if field.Type().IsRepeated() {
return fns.fieldElementJSON(field.Type().Element(), messages, false)
} else {
return fns.embedJSON(field.Type().Embed(), messages)
}
// TODO: deprecated
//case pgs.GroupT:
default:
return ""
}
}
func (fns Funcs) embedJSON(message pgs.Message, messages map[string]int) string {
switch message.WellKnownType() {
case pgs.DurationWKT:
return `"1.000340012s"`
case pgs.EmptyWKT:
return `{}`
case pgs.TimestampWKT:
return `"1972-01-01T10:00:20.021Z"`
case pgs.ListValueWKT:
return `["foo", "bar"]`
case pgs.DoubleValueWKT, pgs.FloatValueWKT:
return `3.1415926`
case pgs.Int64ValueWKT, pgs.UInt64ValueWKT:
return `"string($int64)"`
case pgs.Int32ValueWKT, pgs.UInt32ValueWKT:
return "0"
case pgs.BoolValueWKT:
return "true"
case pgs.StringValueWKT:
return "string"
case pgs.BytesValueWKT:
return `"YmFzZTY0IHN0cmluZw=="`
case pgs.AnyWKT, pgs.StructWKT:
return `{"foo": "bar"}`
//case pgs.ValueWKT: // TODO
default:
messages[message.FullyQualifiedName()]++
return fns.messageJSON(message, messages)
}
}
func (fns Funcs) messageJSON(message pgs.Message, messages map[string]int) string {
var lines []string
if messages[message.FullyQualifiedName()] > 2 {
return "{}"
}
for _, field := range message.Fields() {
val := fns.fieldJSON(field, messages)
if field.Type().IsRepeated() {
val = fmt.Sprintf(`[%s]`, val)
}
lines = append(lines, fmt.Sprintf(`"%s":%s`, field.Name(), val))
}
return fmt.Sprintf(`{%s}`, strings.Join(lines, ","))
}
func (fns Funcs) messageJSONDemo(message pgs.Message) string {
var lines []string
for _, field := range message.Fields() {
val := fns.fieldJSON(field, map[string]int{
message.FullyQualifiedName(): 1,
})
if field.Type().IsRepeated() {
val = fmt.Sprintf(`[%s]`, val)
}
lines = append(lines, fmt.Sprintf("%q:%s", field.Name(), val))
}
jsonVal := fmt.Sprintf("{%s}", strings.Join(lines, ","))
return fns.prettyJSON(jsonVal)
}
func (fns Funcs) wellKnownJSONDemo(message pgs.Message) string {
jsonVal := "{}"
switch message.WellKnownType() {
case pgs.ListValueWKT:
jsonVal = `["foo", "bar"]`
case pgs.AnyWKT, pgs.StructWKT:
jsonVal = `{"foo": "bar"}`
}
return fns.prettyJSON(jsonVal)
}
func (fns Funcs) prettyJSON(v string) string {
var pretty bytes.Buffer
if err := json.Indent(&pretty, []byte(v), "", " "); err != nil {
return "json.Indent err:" + err.Error()
}
return fmt.Sprintf("```json\n%s\n```", string(pretty.Bytes()))
}