/
constructor.go
156 lines (134 loc) · 3.67 KB
/
constructor.go
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package main
import (
"bytes"
"go/format"
"log"
"strings"
"text/template"
"github.com/iancoleman/strcase"
"golang.org/x/tools/go/packages"
)
// createConstructor creates the contents of a constructor and converts them into bytes.
func createConstructor(pkg *packages.Package, fields []field) ([]byte, error) {
type templateInfo struct {
StructName string
Fields []field
Pointer bool
}
body := new(bytes.Buffer)
if err := template.Must(template.New("body").Funcs(map[string]interface{}{
"ToLowerCamel": strcase.ToLowerCamel,
"ToCamel": strcase.ToCamel,
}).Parse(`
func New{{ ToCamel .StructName }}(
{{- range .Fields }}
{{- if eq .ConstructorIgnore false}}
{{ ToLowerCamel .FieldName }} {{ .FieldType }},
{{- end }}
{{- end }}
) {{ if .Pointer }}*{{ end }}{{ .StructName }} {
return {{ if .Pointer }}&{{ end }}{{ .StructName }}{
{{- range .Fields }}
{{- if eq .ConstructorIgnore false}}
{{ .FieldName }}:{{ ToLowerCamel .FieldName }},
{{- end }}
{{- end }}
}
}
`)).Execute(body, templateInfo{
StructName: *typeName,
Fields: fields,
Pointer: *pointer,
}); err != nil {
return nil, err
}
out := new(bytes.Buffer)
if err := template.Must(template.New("out").Parse(`
// Code generated by {{ .CmdName }}; DO NOT EDIT.
package {{ .PackageName }}
{{ .PkgImport }}
{{ .Body }}
{{ .GetterSetter }}
`)).Execute(out, map[string]string{
"CmdName": cliName,
"PackageName": pkg.Name,
"PkgImport": createPkgImport(pkg, fields),
"Body": body.String(),
"GetterSetter": createGetterSetter(fields),
}); err != nil {
return nil, err
}
return format.Source(out.Bytes())
}
// createGetterSetter generate the contents of a getter setter
func createGetterSetter(fields []field) string {
type templateInfo struct {
TypeName string
Fields []field
Getter bool
Setter bool
}
out := new(bytes.Buffer)
if err := template.Must(template.New("getter").Funcs(map[string]interface{}{
"ToCamel": strcase.ToCamel,
}).Parse(`
{{- if eq .Getter true}}
{{- range .Fields }}
{{- if eq .GetterIgnore false}}
func (g *{{ $.TypeName }}) {{ ToCamel .FieldName }}() {{ .FieldType }} {
return g.{{ .FieldName }}
}
{{- end }}
{{ end }}
{{- end }}
{{- if eq .Setter true}}
{{- range .Fields }}
{{- if eq .SetterIgnore false}}
func (s *{{ $.TypeName }}) Set{{ ToCamel .FieldName }}({{ .FieldName }} {{ .FieldType }}) {
s.{{ .FieldName }} = {{ .FieldName }}
}
{{- end }}
{{ end }}
{{- end }}
`)).Execute(out, &templateInfo{
TypeName: *typeName,
Fields: fields,
Getter: *getter,
Setter: *setter,
}); err != nil {
log.Fatalf("create getter setter err:%v", err)
}
return out.String()
}
// createPkgImport generate an import
func createPkgImport(pkg *packages.Package, fields []field) string {
var pkgImports []string
for _, p := range pkg.Imports {
for _, f := range fields {
if !f.ConstructorIgnore && strings.Contains(f.FieldType, p.Name) {
pkgImports = append(pkgImports, p.PkgPath)
}
if *getter && !f.GetterIgnore && strings.Contains(f.FieldType, p.Name) {
pkgImports = append(pkgImports, p.PkgPath)
}
if *setter && !f.SetterIgnore && strings.Contains(f.FieldType, p.Name) {
pkgImports = append(pkgImports, p.PkgPath)
}
}
}
// if the import does not exist
if len(pkgImports) == 0 {
return ""
}
out := new(bytes.Buffer)
if err := template.Must(template.New("out").Parse(`
import(
{{- range . }}
"{{ . }}"
{{- end }}
)
`)).Execute(out, pkgImports); err != nil {
log.Fatal(err)
}
return out.String()
}