[lldb/Lua] Add missing boiler plate to ScriptInterpreter.

- Fix enum entry order.
 - Fix missing enum case in CommandObjectBreakpointCommand.
 - Add Lua entry to swtich in LanguageToString and simplify the code.

lldb/include/lldb/lldb-enumerations.h

@@ -211,11 +211,11 @@ enum DescriptionLevel {
 
 /// Script interpreter types.
 enum ScriptLanguage {
-  eScriptLanguageNone,
+  eScriptLanguageNone = 0,
   eScriptLanguagePython,
   eScriptLanguageLua,
-  eScriptLanguageDefault = eScriptLanguagePython,
-  eScriptLanguageUnknown
+  eScriptLanguageUnknown,
+  eScriptLanguageDefault = eScriptLanguagePython
 };
 
 /// Register numbering types.

lldb/source/Commands/CommandObjectBreakpointCommand.cpp

@@ -307,6 +307,7 @@ are no syntax errors may indicate that a function was declared but never called.
           m_use_script_language = true;
           break;
         case eScriptLanguageNone:
+        case eScriptLanguageUnknown:
           m_use_script_language = false;
           break;
         }

lldb/source/Interpreter/ScriptInterpreter.cpp

@@ -43,21 +43,16 @@ void ScriptInterpreter::CollectDataForWatchpointCommandCallback(
 }
 
 std::string ScriptInterpreter::LanguageToString(lldb::ScriptLanguage language) {
-  std::string return_value;
-
   switch (language) {
   case eScriptLanguageNone:
-    return_value = "None";
-    break;
+    return "None";
   case eScriptLanguagePython:
-    return_value = "Python";
-    break;
+    return "Python";
+  case eScriptLanguageLua:
+    return "Lua";
   case eScriptLanguageUnknown:
-    return_value = "Unknown";
-    break;
+    return "Unknown";
   }
-
-  return return_value;
 }
 
 lldb::ScriptLanguage
@@ -66,6 +61,8 @@ ScriptInterpreter::StringToLanguage(const llvm::StringRef &language) {
     return eScriptLanguageNone;
   if (language.equals_lower(LanguageToString(eScriptLanguagePython)))
     return eScriptLanguagePython;
+  if (language.equals_lower(LanguageToString(eScriptLanguageLua)))
+    return eScriptLanguageLua;
   return eScriptLanguageUnknown;
 }
 
@@ -82,13 +79,12 @@ Status ScriptInterpreter::SetBreakpointCommandCallback(
 }
 
 Status ScriptInterpreter::SetBreakpointCommandCallbackFunction(
-    std::vector<BreakpointOptions *> &bp_options_vec,
-    const char *function_name,
+    std::vector<BreakpointOptions *> &bp_options_vec, const char *function_name,
     StructuredData::ObjectSP extra_args_sp) {
   Status error;
   for (BreakpointOptions *bp_options : bp_options_vec) {
-    error = SetBreakpointCommandCallbackFunction(bp_options, function_name, 
-                                         extra_args_sp);
+    error = SetBreakpointCommandCallbackFunction(bp_options, function_name,
+                                                 extra_args_sp);
     if (!error.Success())
       return error;
   }