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gen.go
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gen.go
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package gen
import (
"fmt"
"io"
"strings"
"github.com/clipperhouse/typewriter"
)
func init() {
err := typewriter.Register(NewWrapperWriter())
if err != nil {
panic(err)
}
}
type WrapperWriter struct{}
func NewWrapperWriter() *WrapperWriter {
return &WrapperWriter{}
}
func (sw *WrapperWriter) Name() string {
return "wrapper"
}
func (sw *WrapperWriter) Imports(t typewriter.Type) []typewriter.ImportSpec {
return []typewriter.ImportSpec{{Path: "github.com/tendermint/go-wire/data"}}
}
func (sw *WrapperWriter) Write(w io.Writer, t typewriter.Type) error {
tag, found := t.FindTag(sw)
if !found {
// nothing to be done
return nil
}
license := `// Auto-generated adapters for happily unmarshaling interfaces
// Apache License 2.0
// Copyright (c) 2017 Ethan Frey (ethan.frey@tendermint.com)
`
if _, err := w.Write([]byte(license)); err != nil {
fmt.Println("write error")
return err
}
// prepare parameters
name := t.Name + "Wrapper"
if len(tag.Values) > 0 {
name = tag.Values[0].Name
}
m := model{Type: t, Wrapper: name, Inner: t.Name}
// now, first main Wrapper
v := typewriter.TagValue{Name: "Wrapper"}
htmpl, err := templates.ByTagValue(t, v)
if err != nil {
return err
}
if err := htmpl.Execute(w, m); err != nil {
return err
}
// Now, add any implementations...
v.Name = "Register"
rtmpl, err := templates.ByTagValue(t, v)
if err != nil {
return err
}
for ti, t := range tag.Values {
if t.Name == "Impl" {
for i, p := range t.TypeParameters {
m.Impl = p
m.Count = i + 1
ni := ti + i + 1
if len(tag.Values) > ni {
m.ImplType = tag.Values[ni].Name
} else {
m.ImplType = strings.ToLower(p.Name)
}
if err := rtmpl.Execute(w, m); err != nil {
return err
}
}
}
}
return nil
}
type model struct {
Type typewriter.Type
Wrapper string
Inner string
Impl typewriter.Type // fill in when adding for implementations
ImplType string
Count int
}