Add a feature where a string data formatter can now be partially composed of Python summary functions
This works similarly to the {thread/frame/process/target.script:...} feature - you write a summary string, part of which is

${var.script:someFuncName}
someFuncName is expected to be declared as
def someFuncName(SBValue,otherArgument) - essentially the same as a summary function

Since . -> [] are the only allowed separators, and % is used for custom formatting, .script: would not be a legitimate symbol anyway, which makes this non-ambiguous

llvm-svn: 220821
diff --git a/lldb/source/Core/Debugger.cpp b/lldb/source/Core/Debugger.cpp
index 4948b83..11328e4 100644
--- a/lldb/source/Core/Debugger.cpp
+++ b/lldb/source/Core/Debugger.cpp
@@ -1735,6 +1735,15 @@
                                     target = valobj;
                                     val_obj_display = ValueObject::eValueObjectRepresentationStyleValue;
                                 }
+                                else if (IsToken (var_name_begin, "var.script:"))
+                                {
+                                    var_name_begin += ::strlen("var.script:");
+                                    std::string script_name(var_name_begin,var_name_end);
+                                    ScriptInterpreter* script_interpreter = valobj->GetTargetSP()->GetDebugger().GetCommandInterpreter().GetScriptInterpreter();
+                                    if (RunScriptFormatKeyword (s, script_interpreter, valobj, script_name))
+                                        var_success = true;
+                                    break;
+                                }
                                 else if (IsToken (var_name_begin,"var%"))
                                 {
                                     was_var_format = true;