Index: lldb/examples/python/crashlog.py
===================================================================
--- lldb/examples/python/crashlog.py
+++ lldb/examples/python/crashlog.py
@@ -26,6 +26,7 @@
 #   PYTHONPATH=/path/to/LLDB.framework/Resources/Python ./crashlog.py ~/Library/Logs/DiagnosticReports/a.crash
 #----------------------------------------------------------------------
 
+import abc
 import concurrent.futures
 import contextlib
 import datetime
@@ -412,19 +413,28 @@
     pass
 
 
-class CrashLogParser:
-    def parse(self, debugger, path, verbose):
+class CrashLogParser(object):
+    "Base class and factory."
+    def __new__(cls, debugger, path, verbose, *args, **kwargs):
         try:
-            return JSONCrashLogParser(debugger, path, verbose).parse()
+            return super(CrashLogParser, cls).__new__(JSONCrashLogParser, *args, **kwargs)
         except CrashLogFormatException:
-            return TextCrashLogParser(debugger, path, verbose).parse()
+            return super(CrashLogParser, cls).__new__(TextCrashLogParser, *args, **kwargs)
 
-
-class JSONCrashLogParser:
     def __init__(self, debugger, path, verbose):
         self.path = os.path.expanduser(path)
         self.verbose = verbose
         self.crashlog = CrashLog(debugger, self.path, self.verbose)
+        self.data = None
+
+    @abc.abstractmethod
+    def parse(self):
+        pass
+
+
+class JSONCrashLogParser(CrashLogParser):
+    def __init__(self, debugger, path, verbose):
+        super().__init__(debugger, path, verbose)
 
     def parse_json(self, buffer):
         try:
@@ -592,7 +602,7 @@
     INSTRS = 5
 
 
-class TextCrashLogParser:
+class TextCrashLogParser(CrashLogParser):
     parent_process_regex = re.compile('^Parent Process:\s*(.*)\[(\d+)\]')
     thread_state_regex = re.compile('^Thread ([0-9]+) crashed with')
     thread_instrs_regex = re.compile('^Thread ([0-9]+) instruction stream')
@@ -617,11 +627,9 @@
 
 
     def __init__(self, debugger, path, verbose):
-        self.path = os.path.expanduser(path)
-        self.verbose = verbose
+        super().__init__(debugger,path,verbose)
         self.thread = None
         self.app_specific_backtrace = False
-        self.crashlog = CrashLog(debugger, self.path, self.verbose)
         self.parse_mode = CrashLogParseMode.NORMAL
         self.parsers = {
             CrashLogParseMode.NORMAL : self.parse_normal,
@@ -1014,7 +1022,7 @@
     if not os.path.exists(crashlog_path):
         raise Exception("crashlog file %s does not exist" % crashlog_path)
 
-    crashlog = CrashLogParser().parse(debugger, crashlog_path, False)
+    crashlog = CrashLogParser(debugger, crashlog_path, False).parse()
 
     target = lldb.SBTarget()
     # 1. Try to use the user-provided target
@@ -1261,7 +1269,7 @@
                     err.SetErrorString(str(e))
                     result.SetError(err)
             else:
-                crash_log = CrashLogParser().parse(debugger, crash_log_file, options.verbose)
+                crash_log = CrashLogParser(debugger, crash_log_file, options.verbose).parse()
                 SymbolicateCrashLog(crash_log, options, result)
 
 if __name__ == '__main__':
Index: lldb/examples/python/scripted_process/crashlog_scripted_process.py
===================================================================
--- lldb/examples/python/scripted_process/crashlog_scripted_process.py
+++ lldb/examples/python/scripted_process/crashlog_scripted_process.py
@@ -11,13 +11,14 @@
 class CrashLogScriptedProcess(ScriptedProcess):
     def parse_crashlog(self):
         try:
-            crash_log = CrashLogParser().parse(self.dbg, self.crashlog_path, False)
+            crashlog_parser = CrashLogParser(self.dbg, self.crashlog_path, False)
+            crashlog = crashlog_parser.parse()
         except Exception as e:
             raise e
 
-        self.pid = crash_log.process_id
-        self.addr_mask = crash_log.addr_mask
-        self.crashed_thread_idx = crash_log.crashed_thread_idx
+        self.pid = crashlog.process_id
+        self.addr_mask = crashlog.addr_mask
+        self.crashed_thread_idx = crashlog.crashed_thread_idx
         self.loaded_images = []
 
         def load_images(self, images):
@@ -35,12 +36,12 @@
                         else:
                             self.loaded_images.append(image)
 
-        for thread in crash_log.threads:
+        for thread in crashlog.threads:
             if self.load_all_images:
-                load_images(self, crash_log.images)
+                load_images(self, crashlog.images)
             elif thread.did_crash():
                 for ident in thread.idents:
-                    load_images(self, crash_log.find_images_with_identifier(ident))
+                    load_images(self, crashlog.find_images_with_identifier(ident))
 
             self.threads[thread.index] = CrashLogScriptedThread(self, None, thread)