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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 main
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 {
return nil, fmt.Errorf("%smissing output: %v", pos(node), x)
}
ret.Output = outputs[0].Value(nil)
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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