/
main.go
81 lines (70 loc) · 1.51 KB
/
main.go
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package main
import (
"go/ast"
"go/parser"
"go/token"
"os"
"text/template"
)
func main() {
types := getEventTypes()
genSpecialize(types)
}
func getEventTypes() []string {
var types []string
fset := token.NewFileSet()
// Parse the file and create an AST
file, err := parser.ParseFile(fset, "events_structs.go", nil, parser.ParseComments)
if err != nil {
panic(err)
}
ast.Inspect(file, func(n ast.Node) bool {
eventValueSpec, ok := n.(*ast.ValueSpec)
if ok && eventValueSpec != nil {
typeIdent, ok := eventValueSpec.Type.(*ast.Ident)
if ok && typeIdent.Name == "EventTypeName" {
types = append(types, eventValueSpec.Names[0].Name)
}
}
return true
})
return types
}
func genSpecialize(types []string) {
specializeTemplate := `package scalingo
// Do not edit, generated with 'go generate'
import (
"encoding/json"
"github.com/Scalingo/go-scalingo/v5/debug"
)
func (pev *Event) Specialize() DetailedEvent {
var e DetailedEvent
ev := *pev
switch ev.Type {
{{ range . }} case {{ . }}:
e = &{{ . }}Type{Event: ev}
{{end}} default:
return pev
}
err := json.Unmarshal(pev.RawTypeData, e.TypeDataPtr())
if err != nil {
debug.Printf("error reading the data: %+v\n", err)
return pev
}
return e
}
`
tpl, err := template.New("specialize-gen").Parse(specializeTemplate)
if err != nil {
panic(err)
}
fd, err := os.OpenFile("events_specialize.go", os.O_TRUNC|os.O_WRONLY, 0644)
if err != nil {
panic(err)
}
defer fd.Close()
err = tpl.Execute(fd, types)
if err != nil {
panic(err)
}
}