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// Copyright 2024 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package filedesc
import (
"fmt"
"google.golang.org/protobuf/encoding/protowire"
"google.golang.org/protobuf/internal/editiondefaults"
"google.golang.org/protobuf/internal/genid"
"google.golang.org/protobuf/reflect/protoreflect"
)
var defaultsCache = make(map[Edition]EditionFeatures)
var defaultsKeys = []Edition{}
func init() {
unmarshalEditionDefaults(editiondefaults.Defaults)
SurrogateProto2.L1.EditionFeatures = getFeaturesFor(EditionProto2)
SurrogateProto3.L1.EditionFeatures = getFeaturesFor(EditionProto3)
SurrogateEdition2023.L1.EditionFeatures = getFeaturesFor(Edition2023)
}
func unmarshalGoFeature(b []byte, parent EditionFeatures) EditionFeatures {
for len(b) > 0 {
num, _, n := protowire.ConsumeTag(b)
b = b[n:]
switch num {
case genid.GoFeatures_LegacyUnmarshalJsonEnum_field_number:
v, m := protowire.ConsumeVarint(b)
b = b[m:]
parent.GenerateLegacyUnmarshalJSON = protowire.DecodeBool(v)
case genid.GoFeatures_ApiLevel_field_number:
v, m := protowire.ConsumeVarint(b)
b = b[m:]
parent.APILevel = int(v)
case genid.GoFeatures_StripEnumPrefix_field_number:
v, m := protowire.ConsumeVarint(b)
b = b[m:]
parent.StripEnumPrefix = int(v)
default:
panic(fmt.Sprintf("unkown field number %d while unmarshalling GoFeatures", num))
}
}
return parent
}
func unmarshalFeatureSet(b []byte, parent EditionFeatures) EditionFeatures {
for len(b) > 0 {
num, typ, n := protowire.ConsumeTag(b)
b = b[n:]
switch typ {
case protowire.VarintType:
v, m := protowire.ConsumeVarint(b)
b = b[m:]
switch num {
case genid.FeatureSet_FieldPresence_field_number:
parent.IsFieldPresence = v == genid.FeatureSet_EXPLICIT_enum_value || v == genid.FeatureSet_LEGACY_REQUIRED_enum_value
parent.IsLegacyRequired = v == genid.FeatureSet_LEGACY_REQUIRED_enum_value
case genid.FeatureSet_EnumType_field_number:
parent.IsOpenEnum = v == genid.FeatureSet_OPEN_enum_value
case genid.FeatureSet_RepeatedFieldEncoding_field_number:
parent.IsPacked = v == genid.FeatureSet_PACKED_enum_value
case genid.FeatureSet_Utf8Validation_field_number:
parent.IsUTF8Validated = v == genid.FeatureSet_VERIFY_enum_value
case genid.FeatureSet_MessageEncoding_field_number:
parent.IsDelimitedEncoded = v == genid.FeatureSet_DELIMITED_enum_value
case genid.FeatureSet_JsonFormat_field_number:
parent.IsJSONCompliant = v == genid.FeatureSet_ALLOW_enum_value
case genid.FeatureSet_EnforceNamingStyle_field_number:
// EnforceNamingStyle is enforced in protoc, languages other than C++
// are not supposed to do anything with this feature.
case genid.FeatureSet_DefaultSymbolVisibility_field_number:
// DefaultSymbolVisibility is enforced in protoc, runtimes should not
// inspect this value.
default:
panic(fmt.Sprintf("unkown field number %d while unmarshalling FeatureSet", num))
}
case protowire.BytesType:
v, m := protowire.ConsumeBytes(b)
b = b[m:]
switch num {
case genid.FeatureSet_Go_ext_number:
parent = unmarshalGoFeature(v, parent)
}
}
}
return parent
}
func featuresFromParentDesc(parentDesc protoreflect.Descriptor) EditionFeatures {
var parentFS EditionFeatures
switch p := parentDesc.(type) {
case *File:
parentFS = p.L1.EditionFeatures
case *Message:
parentFS = p.L1.EditionFeatures
default:
panic(fmt.Sprintf("unknown parent type %T", parentDesc))
}
return parentFS
}
func unmarshalEditionDefault(b []byte) {
var ed Edition
var fs EditionFeatures
for len(b) > 0 {
num, typ, n := protowire.ConsumeTag(b)
b = b[n:]
switch typ {
case protowire.VarintType:
v, m := protowire.ConsumeVarint(b)
b = b[m:]
switch num {
case genid.FeatureSetDefaults_FeatureSetEditionDefault_Edition_field_number:
ed = Edition(v)
}
case protowire.BytesType:
v, m := protowire.ConsumeBytes(b)
b = b[m:]
switch num {
case genid.FeatureSetDefaults_FeatureSetEditionDefault_FixedFeatures_field_number:
fs = unmarshalFeatureSet(v, fs)
case genid.FeatureSetDefaults_FeatureSetEditionDefault_OverridableFeatures_field_number:
fs = unmarshalFeatureSet(v, fs)
}
}
}
defaultsCache[ed] = fs
defaultsKeys = append(defaultsKeys, ed)
}
func unmarshalEditionDefaults(b []byte) {
for len(b) > 0 {
num, _, n := protowire.ConsumeTag(b)
b = b[n:]
switch num {
case genid.FeatureSetDefaults_Defaults_field_number:
def, m := protowire.ConsumeBytes(b)
b = b[m:]
unmarshalEditionDefault(def)
case genid.FeatureSetDefaults_MinimumEdition_field_number,
genid.FeatureSetDefaults_MaximumEdition_field_number:
// We don't care about the minimum and maximum editions. If the
// edition we are looking for later on is not in the cache we know
// it is outside of the range between minimum and maximum edition.
_, m := protowire.ConsumeVarint(b)
b = b[m:]
default:
panic(fmt.Sprintf("unkown field number %d while unmarshalling EditionDefault", num))
}
}
}
func getFeaturesFor(ed Edition) EditionFeatures {
match := EditionUnknown
for _, key := range defaultsKeys {
if key > ed {
break
}
match = key
}
if match == EditionUnknown {
panic(fmt.Sprintf("unsupported edition: %v", ed))
}
return defaultsCache[match]
}
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