1// Copyright 2021 Google LLC 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15package mk2rbc 16 17import ( 18 "bytes" 19 "fmt" 20 "io/ioutil" 21 "os" 22 "strings" 23 24 mkparser "android/soong/androidmk/parser" 25) 26 27// Extracts the list of product config variables from a file, calling 28// given registrar for each variable. 29func FindConfigVariables(mkFile string, vr variableRegistrar) error { 30 mkContents, err := ioutil.ReadFile(mkFile) 31 if err != nil { 32 return err 33 } 34 parser := mkparser.NewParser(mkFile, bytes.NewBuffer(mkContents)) 35 nodes, errs := parser.Parse() 36 if len(errs) > 0 { 37 for _, e := range errs { 38 fmt.Fprintln(os.Stderr, "ERROR:", e) 39 } 40 return fmt.Errorf("cannot parse %s", mkFile) 41 } 42 for _, node := range nodes { 43 asgn, ok := node.(*mkparser.Assignment) 44 if !ok { 45 continue 46 } 47 // We are looking for a variable called '_product_list_vars' 48 // or '_product_single_value_vars'. 49 if !asgn.Name.Const() { 50 continue 51 } 52 varName := asgn.Name.Strings[0] 53 var starType starlarkType 54 if varName == "_product_list_vars" { 55 starType = starlarkTypeList 56 } else if varName == "_product_single_value_vars" { 57 starType = starlarkTypeUnknown 58 } else { 59 continue 60 } 61 for _, name := range strings.Fields(asgn.Value.Dump()) { 62 vr.NewVariable(name, VarClassConfig, starType) 63 } 64 65 } 66 return nil 67} 68