/
template.go
82 lines (71 loc) · 2.25 KB
/
template.go
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// Copyright 2020 Adam S Levy
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
package reflect2go
import (
"bytes"
"fmt"
"go/format"
"io"
"text/template"
)
const gofile = `
{{- if ne .PkgComment "" }}
{{ wrap .Preamble }}
{{end }}
{{- if ne .PkgComment "" }}
{{ wrap .PkgComment }}
{{- end }}
package {{ .PkgName }}
{{- if eq (len .Imports) 1 }}
import {{ printf "%q" (index .Imports 0) }}
{{- else if gt (len .Imports) 1 }}
import (
{{- range .Imports }}
{{ printf "%q" . }}
{{- end}}
)
{{- end}}
{{- range .Types }}
{{- if ne .Comment "" }}
{{ wrap .Comment }}
{{- end }}
type {{ .Name }} {{ .Definition }}
{{- end}}
`
// Render writes the GoFile to w.
func (f GoFile) Render(w io.Writer) error {
gofileTmpl := template.Must(template.New("gofile").Funcs(template.FuncMap{
"wrap": func(s string) string {
return f.wrapper.Wrap(s, f.commentLineWrap)
},
}).Parse(gofile))
var buf bytes.Buffer
if err := gofileTmpl.Execute(&buf, f); err != nil {
// Prior validation should ensure the template always executes.
panic(err)
}
gofmt, err := format.Source(buf.Bytes())
if err != nil {
// The template should always generate valid Go code.
panic(fmt.Errorf("gofmt: %w \ninput:\n%v", err, buf.String()))
}
_, err = w.Write(gofmt)
return err
}