| // 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 ( |
| "sync" |
| ) |
| |
| import ( |
| "google.golang.org/protobuf/types/descriptorpb" |
| ) |
| |
| type locationStore struct { |
| sourceCodeInfoLocations []*descriptorpb.SourceCodeInfo_Location |
| |
| initLocations sync.Once |
| pathToLocation map[string]Location |
| } |
| |
| func newLocationStore(sourceCodeInfoLocations []*descriptorpb.SourceCodeInfo_Location) *locationStore { |
| return &locationStore{ |
| sourceCodeInfoLocations: sourceCodeInfoLocations, |
| pathToLocation: make(map[string]Location), |
| } |
| } |
| |
| func (l *locationStore) getLocation(path []int32) Location { |
| return l.getLocationByPathKey(getPathKey(path)) |
| } |
| |
| func (l *locationStore) getLocationByPathKey(pathKey string) Location { |
| l.initLocations.Do(func() { |
| pathToLocation := make(map[string]Location) |
| for _, sourceCodeInfoLocation := range l.sourceCodeInfoLocations { |
| pathKey := getPathKey(sourceCodeInfoLocation.Path) |
| // - Multiple locations may have the same path. This happens when a single |
| // logical declaration is spread out across multiple places. The most |
| // obvious example is the "extend" block again -- there may be multiple |
| // extend blocks in the same scope, each of which will have the same path. |
| if _, ok := pathToLocation[pathKey]; !ok { |
| pathToLocation[pathKey] = newLocation(sourceCodeInfoLocation) |
| } |
| } |
| l.pathToLocation = pathToLocation |
| }) |
| |
| return l.pathToLocation[pathKey] |
| } |
| |
| func getPathKey(path []int32) string { |
| key := make([]byte, len(path)*4) |
| j := 0 |
| for _, elem := range path { |
| key[j] = byte(elem) |
| key[j+1] = byte(elem >> 8) |
| key[j+2] = byte(elem >> 16) |
| key[j+3] = byte(elem >> 24) |
| j += 4 |
| } |
| return string(key) |
| } |