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- // Copyright 2018 Google Inc. All rights reserved.
- //
- // Licensed 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 makedeps
- import (
- "bytes"
- "fmt"
- "io"
- "strings"
- "android/soong/androidmk/parser"
- )
- type Deps struct {
- Output string
- Inputs []string
- }
- func Parse(filename string, r io.Reader) (*Deps, error) {
- p := parser.NewParser(filename, r)
- nodes, errs := p.Parse()
- if len(errs) == 1 {
- return nil, errs[0]
- } else if len(errs) > 1 {
- return nil, fmt.Errorf("many errors: %v", errs)
- }
- pos := func(node parser.Node) string {
- return p.Unpack(node.Pos()).String() + ": "
- }
- ret := &Deps{}
- for _, node := range nodes {
- switch x := node.(type) {
- case *parser.Comment:
- // Do nothing
- case *parser.Rule:
- if x.Recipe != "" {
- return nil, fmt.Errorf("%sunexpected recipe in rule: %v", pos(node), x)
- }
- if !x.Target.Const() {
- return nil, fmt.Errorf("%sunsupported variable expansion: %v", pos(node), x.Target.Dump())
- }
- outputs := x.Target.Words()
- if len(outputs) > 0 {
- ret.Output = outputs[0].Value(nil)
- } else {
- // TODO(b/141372861): put this back
- //return nil, fmt.Errorf("%smissing output: %v", pos(node), x)
- }
- if !x.Prerequisites.Const() {
- return nil, fmt.Errorf("%sunsupported variable expansion: %v", pos(node), x.Prerequisites.Dump())
- }
- for _, input := range x.Prerequisites.Words() {
- ret.Inputs = append(ret.Inputs, input.Value(nil))
- }
- default:
- return nil, fmt.Errorf("%sunexpected line: %#v", pos(node), node)
- }
- }
- return ret, nil
- }
- func (d *Deps) Print() []byte {
- // We don't really have to escape every \, but it's simpler,
- // and ninja will handle it.
- replacer := strings.NewReplacer(" ", "\\ ",
- ":", "\\:",
- "#", "\\#",
- "$", "$$",
- "\\", "\\\\")
- b := &bytes.Buffer{}
- fmt.Fprintf(b, "%s:", replacer.Replace(d.Output))
- for _, input := range d.Inputs {
- fmt.Fprintf(b, " %s", replacer.Replace(input))
- }
- fmt.Fprintln(b)
- return b.Bytes()
- }
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