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Go: Add helpers for defined enum types #316

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41 changes: 39 additions & 2 deletions shared/src/main/scala/io/kaitai/struct/languages/GoCompiler.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -524,6 +524,7 @@ class GoCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)
override def enumDeclaration(curClass: List[String], enumName: String, enumColl: Seq[(Long, EnumValueSpec)]): Unit = {
val fullEnumName: List[String] = curClass ++ List(enumName)
val fullEnumNameStr = types2class(fullEnumName)
importList.add("fmt")

out.puts
out.puts(s"type $fullEnumNameStr int")
Expand All @@ -536,15 +537,51 @@ class GoCompiler(typeProvider: ClassTypeProvider, config: RuntimeConfig)

out.dec
out.puts(")")

// Inspired by https://gist.github.com/bgadrian/cb8b9344d9c66571ef331a14eb7a2e80
val mapEntriesStr = enumColl.map { case (id, _) => s"$id: {}" }.mkString(", ")
out.puts(s"var values_$fullEnumNameStr = map[$fullEnumNameStr]struct{}{$mapEntriesStr}")
val mapEntriesStr = enumColl.map { case (id, label) => s"$id: \"${type2class(label.name)}\"" }.mkString(", ")
val valuesArrayStr = enumColl.map { case (id, label) => s"$id" }.mkString(", ")
val namesArrayStr = enumColl.map { case (id, label) => s"\"${type2class(label.name)}\"" }.mkString(", ")
out.puts(s"var values_$fullEnumNameStr = map[$fullEnumNameStr]string{$mapEntriesStr}")
out.puts(s"var valueValues_$fullEnumNameStr = []$fullEnumNameStr{$valuesArrayStr}")
out.puts(s"var valueNames_$fullEnumNameStr = []string{$namesArrayStr}")

out.puts(s"func (v $fullEnumNameStr) isDefined() bool {")
out.inc
out.puts(s"_, ok := values_$fullEnumNameStr[v]")
out.puts("return ok")
out.dec
out.puts("}")

out.puts(s"func (v $fullEnumNameStr) IsA$fullEnumNameStr() bool {")
out.inc
out.puts(s"return v.isDefined()")
out.dec
out.puts("}")

out.puts(s"func (v $fullEnumNameStr) String() string {")
out.inc
out.puts(s"name, ok := values_$fullEnumNameStr[v]")
out.puts("if ok {")
out.inc
out.puts("return name")
out.dec
out.puts("}")
out.puts(s"return fmt.Sprintf(\"${fullEnumNameStr}(%d)\", v)")
out.dec
out.puts("}")

out.puts(s"func ${fullEnumNameStr}Strings() []string {")
out.inc
out.puts(s"return valueNames_$fullEnumNameStr")
out.dec
out.puts("}")

out.puts(s"func ${fullEnumNameStr}Values() []${fullEnumNameStr} {")
out.inc
out.puts(s"return valueValues_$fullEnumNameStr")
out.dec
out.puts("}")
}

override def classToString(toStringExpr: Ast.expr): Unit = {
Expand Down