149 lines
3.0 KiB
Go
149 lines
3.0 KiB
Go
/*
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Copyright 2019 The KubeSphere Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"bytes"
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"flag"
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"fmt"
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"go/ast"
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"go/format"
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"go/parser"
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"go/token"
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"io/ioutil"
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"log"
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"os"
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"path/filepath"
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"strings"
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"text/template"
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)
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func main() {
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log.SetFlags(0)
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log.SetPrefix("resource-gen: ")
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flag.Parse()
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fileSet := token.NewFileSet()
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target := os.Getenv("GOFILE")
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log.Println("start parse", target)
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f, err := parser.ParseFile(fileSet, target, nil, 0)
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if err != nil {
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log.Fatal(err)
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}
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imports := make(map[string]string, 0)
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lister := make(map[string][2]string, 0)
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for _, i := range f.Imports {
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if i.Name != nil {
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imports[i.Name.Name] = i.Path.Value
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} else {
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j := strings.LastIndex(i.Path.Value, "/")
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if j > 0 {
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imports[i.Path.Value[j+1:]] = i.Path.Value
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} else {
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imports[i.Path.Value] = i.Path.Value
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}
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}
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}
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for _, v := range f.Scope.Objects {
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if v.Kind != ast.Var || !strings.HasSuffix(v.Name, "Lister") {
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continue
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}
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if d, ok := v.Decl.(*ast.ValueSpec); ok {
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if t, ok := d.Type.(*ast.SelectorExpr); ok {
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if strings.HasSuffix(t.Sel.Name, "Lister") {
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lister[t.Sel.Name] = [2]string{t.X.(*ast.Ident).Name, v.Name}
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}
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}
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}
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}
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src := genString(imports, lister)
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baseName := fmt.Sprintf("getter.go")
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outputName := filepath.Join(".", strings.ToLower(baseName))
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err = ioutil.WriteFile(outputName, src, 0644)
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if err != nil {
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log.Fatalln(err)
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}
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}
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func genString(imports map[string]string, lister map[string][2]string) []byte {
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const strTmp = `
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package {{.pkg}}
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import (
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{{range $index,$str :=.imports}}
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{{$str}}
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{{end}}
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)
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{{range $l,$m :=.lister}}
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func Get{{$l}}() {{index $m 0}}.{{$l}} {
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return {{index $m 1}}
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}
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{{end}}
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`
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pkgName := os.Getenv("GOPACKAGE")
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i := make([]string, 0)
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for _, v := range lister {
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if imports[v[0]] == "" {
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log.Panicln("import xxxxxx")
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} else {
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str := fmt.Sprintln(v[0], imports[v[0]])
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if !hasString(i, str) {
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i = append(i, fmt.Sprintln(v[0], imports[v[0]]))
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}
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}
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}
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data := map[string]interface{}{
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"pkg": pkgName,
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"imports": i,
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"lister": lister,
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}
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//利用模板库，生成代码文件
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t, err := template.New("").Parse(strTmp)
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if err != nil {
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log.Fatal(err)
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}
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buff := bytes.NewBufferString("")
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err = t.Execute(buff, data)
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if err != nil {
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log.Fatal(err)
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}
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//进行格式化
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src, err := format.Source(buff.Bytes())
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if err != nil {
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log.Fatal(err)
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}
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return src
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}
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func hasString(slice []string, str string) bool {
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for _, s := range slice {
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if s == str {
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return true
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}
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}
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return false
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}
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