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|
// +build ignore
package main
// This program generates *_options_.go files to be used by the bindings calls to API service.
// It can be invoked by running go generate
import (
"errors"
"fmt"
"go/ast"
"go/parser"
"go/token"
"io/ioutil"
"os"
"os/exec"
"strings"
"text/template"
"unicode"
"unicode/utf8"
)
var bodyTmpl = `// Code generated by go generate; DO NOT EDIT.
package {{.PackageName}}
import (
{{range $import := .Imports}} {{$import}}
{{end}}
)
// Changed returns true if named field has been set
func (o *{{.StructName}}) Changed(fieldName string) bool {
return util.Changed(o, fieldName)
}
// ToParams formats struct fields to be passed to API service
func (o *{{.StructName}}) ToParams() (url.Values, error) {
return util.ToParams(o)
}
{{range $field := .Fields}}
// With{{.Name}} set {{if .Comment}}{{.Comment}}{{else}}field {{.Name}} to given value{{end}}
func(o *{{.StructName}}) With{{.Name}}(value {{.Type}}) *{{.StructName}} {
o.{{.Name}} = {{if not .Composite}}&{{end}}value
return o
}
// Get{{.Name}} returns value of {{if .Comment}}{{.Comment}}{{else}}field {{.Name}}{{end}}
func(o *{{.StructName}}) Get{{.Name}}() {{.Type}} {
if o.{{.Name}} == nil {
var z {{.Type}}
return z
}
return {{if not .Composite}}*{{end}}o.{{.Name}}
}
{{end}}
`
type fieldStruct struct {
Comment string
Composite bool
Name string
StructName string
Type string
}
func main() {
var (
closed bool
fieldStructs []fieldStruct
)
srcFile := os.Getenv("GOFILE")
inputStructName := os.Args[1]
b, err := ioutil.ReadFile(srcFile)
if err != nil {
panic(err)
}
fset := token.NewFileSet() // positions are relative to fset
f, err := parser.ParseFile(fset, "", b, parser.ParseComments)
if err != nil {
panic(err)
}
// always add reflect
imports := []string{"\"reflect\"", "\"github.com/containers/podman/v3/pkg/bindings/internal/util\""}
for _, imp := range f.Imports {
imports = append(imports, imp.Path.Value)
}
out, err := os.Create(strings.TrimRight(srcFile, ".go") + "_" + strings.Replace(strings.ToLower(inputStructName), "options", "_options", 1) + ".go")
if err != nil {
panic(err)
}
defer func() {
if !closed {
out.Close()
}
}()
body := template.Must(template.New("body").Parse(bodyTmpl))
ast.Inspect(f, func(n ast.Node) bool {
ref, refOK := n.(*ast.TypeSpec)
if !(refOK && ref.Name.Name == inputStructName) {
return true
}
x := ref.Type.(*ast.StructType)
for _, field := range x.Fields.List {
var name string
if len(field.Names) > 0 {
name = field.Names[0].Name
if len(name) < 1 {
panic(errors.New("bad name"))
}
}
var composite bool
switch field.Type.(type) {
case *ast.MapType, *ast.StructType, *ast.ArrayType:
composite = true
}
//sub := "*"
typeExpr := field.Type
start := typeExpr.Pos() - 1
end := typeExpr.End() - 1
fieldType := strings.Replace(string(b[start:end]), "*", "", 1)
fieldStructs = append(fieldStructs, fieldStruct{
Comment: fmtComment(field.Comment.Text()),
Composite: composite,
Name: name,
StructName: inputStructName,
Type: fieldType,
})
} // for
bodyStruct := struct {
PackageName string
Imports []string
StructName string
Fields []fieldStruct
}{
PackageName: os.Getenv("GOPACKAGE"),
Imports: imports,
StructName: inputStructName,
Fields: fieldStructs,
}
// create the body
if err := body.Execute(out, bodyStruct); err != nil {
fmt.Println(err)
os.Exit(1)
}
// close out file
if err := out.Close(); err != nil {
fmt.Println(err)
os.Exit(1)
}
closed = true
// go fmt file
gofmt := exec.Command("go", "fmt", out.Name())
gofmt.Stderr = os.Stdout
if err := gofmt.Run(); err != nil {
fmt.Println(err)
os.Exit(1)
}
// go import file
goimport := exec.Command("goimports", "-w", out.Name())
goimport.Stderr = os.Stdout
if err := goimport.Run(); err != nil {
fmt.Println(err)
os.Exit(1)
}
return true
})
}
func fmtComment(comment string) string {
r, n := utf8.DecodeRuneInString(comment)
if r != utf8.RuneError {
comment = string(unicode.ToLower(r)) + comment[n:]
}
comment = strings.TrimSpace(comment)
return comment
}
|
