Add first version of YamlFSM

lib/tfw/__init__.py

@@ -4,3 +4,4 @@
 from .event_handler_base import EventHandlerBase, TriggeredEventHandler, BroadcastingEventHandler
 from .fsm_base import FSMBase
 from .linear_fsm import LinearFSM
+from .yaml_fsm import YamlFSM

lib/tfw/yaml_fsm.py

@@ -0,0 +1,18 @@
+import yaml
+from transitions import State
+
+from tfw import FSMBase
+
+
+class YamlFSM(FSMBase):
+    def __init__(self, config_file):
+        self.config = self.parse_config(config_file)
+        self.states = [State(**state) for state in self.config['states']]
+        super(YamlFSM, self).__init__()
+        for transition in self.config['transitions']:
+            self.machine.add_transition(**transition)
+
+    @staticmethod
+    def parse_config(config_file):
+        with open(config_file, 'r') as ifile:
+            return yaml.load(ifile)

requirements.txt

@@ -3,3 +3,4 @@ pyzmq==17.0.0
 transitions==0.6.4
 terminado==0.8.1
 watchdog==0.8.3
+PyYAML==3.12