| // Licensed to the Apache Software Foundation (ASF) under one or more |
| // contributor license agreements. See the NOTICE file distributed with |
| // this work for additional information regarding copyright ownership. |
| // The ASF licenses this file to You under the Apache License, Version 2.0 |
| // (the "License"); you may not use this file except in compliance with |
| // the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package protosource |
| |
| import ( |
| "google.golang.org/protobuf/encoding/protowire" |
| |
| "google.golang.org/protobuf/proto" |
| |
| "google.golang.org/protobuf/reflect/protoreflect" |
| |
| "google.golang.org/protobuf/types/descriptorpb" |
| ) |
| |
| type optionExtensionDescriptor struct { |
| message proto.Message |
| optionsPath []int32 |
| locationStore *locationStore |
| } |
| |
| func newOptionExtensionDescriptor(message proto.Message, optionsPath []int32, locationStore *locationStore) optionExtensionDescriptor { |
| return optionExtensionDescriptor{ |
| message: message, |
| optionsPath: optionsPath, |
| locationStore: locationStore, |
| } |
| } |
| |
| func (o *optionExtensionDescriptor) OptionExtension(extensionType protoreflect.ExtensionType) (interface{}, bool) { |
| if extensionType.TypeDescriptor().ContainingMessage().FullName() != o.message.ProtoReflect().Descriptor().FullName() { |
| return nil, false |
| } |
| if !proto.HasExtension(o.message, extensionType) { |
| return nil, false |
| } |
| return proto.GetExtension(o.message, extensionType), true |
| } |
| |
| func (o *optionExtensionDescriptor) OptionExtensionLocation(extensionType protoreflect.ExtensionType, extraPath ...int32) Location { |
| if extensionType.TypeDescriptor().ContainingMessage().FullName() != o.message.ProtoReflect().Descriptor().FullName() { |
| return nil |
| } |
| if o.locationStore == nil { |
| return nil |
| } |
| path := make([]int32, len(o.optionsPath), len(o.optionsPath)+1+len(extraPath)) |
| copy(path, o.optionsPath) |
| path = append(path, int32(extensionType.TypeDescriptor().Number())) |
| extensionPathLen := len(path) // length of path to extension (without extraPath) |
| path = append(path, extraPath...) |
| loc := o.locationStore.getLocation(path) |
| if loc != nil { |
| // Found an exact match! |
| return loc |
| } |
| // "Fuzzy" search: find a location whose path is at least extensionPathLen long, |
| // preferring the longest matching ancestor path (i.e. as many extraPath elements |
| // as can be found). If we find a *sub*path (a descendant path, that points INTO |
| // the path we are trying to find), use the first such one encountered. |
| var bestMatch *descriptorpb.SourceCodeInfo_Location |
| var bestMatchPathLen int |
| for _, loc := range o.locationStore.sourceCodeInfoLocations { |
| if len(loc.Path) >= extensionPathLen && isDescendantPath(path, loc.Path) && len(loc.Path) > bestMatchPathLen { |
| bestMatch = loc |
| bestMatchPathLen = len(loc.Path) |
| } else if isDescendantPath(loc.Path, path) { |
| return newLocation(loc) |
| } |
| } |
| if bestMatch != nil { |
| return newLocation(bestMatch) |
| } |
| return nil |
| } |
| |
| func (o *optionExtensionDescriptor) PresentExtensionNumbers() []int32 { |
| fieldNumbersSet := map[int32]struct{}{} |
| var fieldNumbers []int32 |
| addFieldNumber := func(fieldNo int32) { |
| if _, ok := fieldNumbersSet[fieldNo]; !ok { |
| fieldNumbersSet[fieldNo] = struct{}{} |
| fieldNumbers = append(fieldNumbers, fieldNo) |
| } |
| } |
| msg := o.message.ProtoReflect() |
| extensionRanges := msg.Descriptor().ExtensionRanges() |
| for b := msg.GetUnknown(); len(b) > 0; { |
| fieldNo, _, n := protowire.ConsumeField(b) |
| if extensionRanges.Has(fieldNo) { |
| addFieldNumber(int32(fieldNo)) |
| } |
| b = b[n:] |
| } |
| // Extensions for google.protobuf.*Options are a bit of a special case |
| // as the extensions in a FileDescriptorSet message may differ with |
| // the extensions defined in the proto with which buf is compiled. |
| // |
| // Also loop through known extensions here to get extension numbers. |
| msg.Range(func(fieldDescriptor protoreflect.FieldDescriptor, _ protoreflect.Value) bool { |
| if fieldDescriptor.IsExtension() { |
| addFieldNumber(int32(fieldDescriptor.Number())) |
| } |
| return true |
| }) |
| |
| return fieldNumbers |
| } |
| |
| func isDescendantPath(descendant, ancestor []int32) bool { |
| if len(descendant) < len(ancestor) { |
| return false |
| } |
| for i := range ancestor { |
| if descendant[i] != ancestor[i] { |
| return false |
| } |
| } |
| return true |
| } |