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/
slicewriter.go
139 lines (108 loc) · 2.37 KB
/
slicewriter.go
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package slice
import (
"io"
"regexp"
"strings"
"github.com/rickb777/typewriter"
)
func init() {
err := typewriter.Register(NewSliceWriter())
if err != nil {
panic(err)
}
}
func SliceName(typ typewriter.Type) string {
return typ.Name + "Slice"
}
type SliceWriter struct{}
func NewSliceWriter() *SliceWriter {
return &SliceWriter{}
}
func (sw *SliceWriter) Name() string {
return "slice"
}
func (sw *SliceWriter) Imports(typ typewriter.Type) (result []typewriter.ImportSpec) {
// typewriter uses golang.org/x/tools/imports, depend on that
return
}
func (sw *SliceWriter) Write(w io.Writer, typ typewriter.Type) error {
tag, found := typ.FindTag(sw.Name())
if !found {
return nil
}
if includeSortImplementation(tag.Values) {
s := `// Sort implementation is a modification of http://golang.org/pkg/sort/#Sort
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found at http://golang.org/LICENSE.
`
w.Write([]byte(s))
}
// start with the slice template
tmpl, err := templates.ByTag(typ, tag)
if err != nil {
return err
}
m := model{
Type: typ,
SliceName: SliceName(typ),
}
if err := tmpl.Execute(w, m); err != nil {
return err
}
for _, v := range tag.Values {
var tp typewriter.Type
if len(v.TypeParameters) > 0 {
tp = v.TypeParameters[0]
}
m := model{
Type: typ,
SliceName: SliceName(typ),
TypeParameter: tp,
TagValue: v,
}
tmpl, err := templates.ByTagValue(typ, v)
if err != nil {
return err
}
if err := tmpl.Execute(w, m); err != nil {
return err
}
}
if includeSortInterface(tag.Values) {
tmpl, err := sortInterface.Parse()
if err != nil {
return err
}
if err := tmpl.Execute(w, m); err != nil {
return err
}
}
if includeSortImplementation(tag.Values) {
tmpl, err := sortImplementation.Parse()
if err != nil {
return err
}
if err := tmpl.Execute(w, m); err != nil {
return err
}
}
return nil
}
func includeSortImplementation(values []typewriter.TagValue) bool {
for _, v := range values {
if strings.HasPrefix(v.Name, "SortBy") {
return true
}
}
return false
}
func includeSortInterface(values []typewriter.TagValue) bool {
reg := regexp.MustCompile(`^Sort(Desc)?$`)
for _, v := range values {
if reg.MatchString(v.Name) {
return true
}
}
return false
}