102 lines
2.4 KiB
Go
102 lines
2.4 KiB
Go
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package main
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import (
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"bytes"
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"go/format"
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"go/parser"
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"go/token"
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"io/ioutil"
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"log"
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"path/filepath"
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"sort"
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"strings"
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"text/template"
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)
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var eventHandlerTmpl = template.Must(template.New("eventHandler").Funcs(template.FuncMap{
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"constName": constName,
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"privateName": privateName,
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}).Parse(`// Code generated by "eventhandlers"; DO NOT EDIT
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// See events.go
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package gavalink
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// Following are all the event types.
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// Event type values are used to match the events returned by Lavalink.
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const ({{range .}}
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{{privateName .}}EventType = "{{constName .}}"{{end}}
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)
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{{range .}}
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// {{privateName .}}EventHandler is an event handler for {{.}} events.
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type {{privateName .}}EventHandler func(*Player, *{{.}})
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// Type returns the event type for {{.}} events.
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func (eh {{privateName .}}EventHandler) Type() string {
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return {{privateName .}}EventType
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}
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// New returns a new instance of {{.}}.
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func (eh {{privateName .}}EventHandler) New() interface{} {
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return &{{.}}{}
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}
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// Handle is the handler for {{.}} events.
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func (eh {{privateName .}}EventHandler) Handle(p *Player, i interface{}) {
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if t, ok := i.(*{{.}}); ok {
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eh(p, t)
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}
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}
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{{end}}
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func handlerForInterface(handler interface{}) EventHandler {
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switch v := handler.(type) {
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case func(*Player, interface{}):
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return interfaceEventHandler(v){{range .}}
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case func(*Player, *{{.}}):
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return {{privateName .}}EventHandler(v){{end}}
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}
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return nil
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}
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func init() { {{range .}}
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registerInterfaceProvider({{privateName .}}EventHandler(nil)){{end}}
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}
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`))
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func main() {
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var buf bytes.Buffer
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dir := filepath.Dir(".")
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fs := token.NewFileSet()
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parsedFile, err := parser.ParseFile(fs, "events.go", nil, 0)
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if err != nil {
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log.Fatalf("warning: internal error: could not parse events.go: %s", err)
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return
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}
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names := []string{}
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for object := range parsedFile.Scope.Objects {
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names = append(names, object)
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}
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sort.Strings(names)
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eventHandlerTmpl.Execute(&buf, names)
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src, err := format.Source(buf.Bytes())
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if err != nil {
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log.Println("warning: internal error: invalid Go generated:", err)
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src = buf.Bytes()
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}
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err = ioutil.WriteFile(filepath.Join(dir, strings.ToLower("eventhandlers.go")), src, 0644)
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if err != nil {
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log.Fatal(buf, "writing output: %s", err)
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}
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}
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func constName(name string) string {
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return name + "Event"
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}
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func privateName(name string) string {
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return strings.ToLower(string(name[0])) + name[1:]
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}
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