Expose TC and transitions on class

pycmx/parse_cmx_events.py

@@ -54,10 +54,36 @@ class Edit:
         self.clip_name_statement = clip_name_statement
         self.source_file_statement = source_file_statement
 
+    @property
+    def transition(self):
+        return Transition(self.edit_statement.trans, self.edit_statement.trans_op)
+   
+    @property
+    def source_in(self):
+        return self.edit_statement.source_in
+
+    @property
+    def source_out(self):
+        return self.edit_statement.source_out
+
+    @property
+    def record_in(self):
+        return self.edit_statement.record_in
+
+    @property
+    def record_out(self):
+        return self.edit_statement.record_out
+
     @property
     def source(self):
         return self.edit_statement.source
 
+
+    @property
+    def source_file(self):
+        return self.source_file_statement.filename
+
+
     @property
     def clip_name(self):
         if self.clip_name_statement != None:
@@ -129,5 +155,85 @@ class Event:
 
     
 
- 
+class Transition:
+    """Represents a CMX transition, a wipe, dissolve or cut."""
+
+    Cut = "C"
+    Dissolve = "D"
+    Wipe = "W"
+    KeyBackground = "KB"
+    Key = "K"
+    KeyOut = "KO"
+
+    def __init__(self, transition, operand):
+        self.transition = transition
+        self.operand = operand
+        self.name = ''
+
+
+    @property
+    def kind(self):
+        if self.cut:
+            return Transition.Cut
+        elif self.dissolve:
+            return Transition.Dissolve
+        elif self.wipe:
+            return Transition.Wipe
+        elif self.key_background:
+            return Transition.KeyBackground
+        elif self.key_foreground:
+            return Transition.Key
+        elif self.key_out:
+            return Transition.KeyOut
+
+    @property
+    def cut(self):
+        "`True` if this transition is a cut."
+        return self.transition == 'C' 
+
+    @property
+    def dissolve(self):
+        "`True` if this traansition is a dissolve."
+        return self.transition == 'D'
+
+
+    @property
+    def wipe(self):
+        "`True` if this transition is a wipe."
+        return self.transition.startswith('W')
+
+
+    @property
+    def effect_duration(self):
+        """"`The duration of this transition, in frames of the record target.
+        
+        In the event of a key event, this is the duration of the fade in.
+        """
+        return int(self.operand)
+
+    @property
+    def wipe_number(self):
+        "Wipes are identified by a particular number."
+        if self.wipe:
+            return int(self.transition[1:])
+        else:
+            return None
+
+    @property
+    def key_background(self):
+        "`True` if this is a key background event."
+        return self.transition == KeyBackground
+
+    @property
+    def key_foreground(self):
+        "`True` if this is a key foreground event."
+        return self.transition == Key
+
+    @property
+    def key_out(self):
+        "`True` if this is a key out event."
+        return self.transition == KeyOut
+
+    def __repr__(self):
+        return f"""CmxTransition(transition={self.transition.__repr__()},operand={self.operand.__repr__()})"""