Add a dedicated module for a dedicated FallthruAnalyzer.

bin/sixtypical

@@ -60,7 +60,12 @@ def process_input_files(filenames, options):
 
     if options.dump_fallthru_map:
         import json
-        sys.stdout.write(json.dumps(program.fallthru_map, indent=4, sort_keys=True))
+        from sixtypical.fallthru import FallthruAnalyzer
+
+        fa = FallthruAnalyzer(debug=options.debug)
+        fa.analyze_program(program)
+
+        sys.stdout.write(json.dumps(fa.fallthru_map, indent=4, sort_keys=True))
         sys.stdout.write("\n")
 
     if options.analyze_only:
@@ -155,6 +160,11 @@ if __name__ == '__main__':
         action="store_true",
         help="Dump the fallthru map to stdout after analyzing the program."
     )
+    argparser.add_argument(
+        "--dump-fallthru-ordering",
+        action="store_true",
+        help="Dump the fallthru ordering to stdout after analyzing the program."
+    )
     argparser.add_argument(
         "--parse-only",
         action="store_true",

src/sixtypical/analyzer.py

@@ -310,14 +310,9 @@ class Analyzer(object):
     def analyze_program(self, program):
         assert isinstance(program, Program)
         self.routines = {r.location: r for r in program.routines}
-        fallthru_map = {}
         for routine in program.routines:
             context = self.analyze_routine(routine)
-            if context:
-                encountered_gotos = list(context.encountered_gotos())
-                if len(encountered_gotos) == 1 and isinstance(encountered_gotos[0].type, RoutineType):
-                    fallthru_map.setdefault(encountered_gotos[0].name, set()).add(routine.name)
-        program.fallthru_map = dict([(k, sorted(v)) for k, v in fallthru_map.iteritems()])
+            routine.encountered_gotos = list(context.encountered_gotos()) if context else []
 
     def analyze_routine(self, routine):
         assert isinstance(routine, Routine)

src/sixtypical/fallthru.py

@@ -0,0 +1,23 @@
+# encoding: UTF-8
+
+from sixtypical.model import RoutineType
+
+
+class FallthruAnalyzer(object):
+
+    def __init__(self, debug=False):
+        self.debug = debug
+
+    def analyze_program(self, program):
+        fallthru_map = {}
+        for routine in program.routines:
+            encountered_gotos = list(routine.encountered_gotos)
+            if len(encountered_gotos) == 1 and isinstance(encountered_gotos[0].type, RoutineType):
+                fallthru_map.setdefault(encountered_gotos[0].name, set()).add(routine.name)
+        self.fallthru_map = dict([(k, sorted(v)) for k, v in fallthru_map.iteritems()])
+
+    def break_cycles(self):
+        raise NotImplementedError
+
+    def serialize(self):
+        raise NotImplementedError