Add: Arc支持designant

Author: feightwywx

src/arcfutil/aff/note/arc.py

@@ -15,15 +15,15 @@
 
 class Arc(Hold):
     def __init__(self, time: int, totime: int, fromx: float, tox: float, slideeasing: Union[str, Callable, List[Callable]], fromy: float, toy: float,
-                 color: int, isskyline: bool, skynote: list = None, fx=None):
+                 color: int, isskyline: Union[bool, str], skynote: list = None, fx=None):
         super(Arc, self).__init__(time, totime, 1)
         self.fromx: float = fromx
         self.fromy: float = fromy
         self.tox: float = tox
         self.toy: float = toy
         self.slideeasing: Union[str, Callable, List[Callable]] = slideeasing
         self.color: int = color
-        self.isskyline: bool = isskyline
+        self.isskyline: Union[bool, str] = isskyline
         self.skynote: list = skynote
         self.fx: str = fx
 
@@ -75,7 +75,7 @@ def __str__(self):
                     '{isskyline})'.format(
                     time=int(self.time), totime=int(self.totime), fromx=self.fromx, fromy=self.fromy,
                     slideeasing=self.slideeasing, tox=self.tox, toy=self.toy, color=int(self.color),
-                    fx=self.fx if self.fx else 'none', isskyline='true' if self.isskyline else 'false'
+                    fx=self.fx if self.fx else 'none', isskyline=self.isskyline
                     )
             skynotestr = ''
             if self.skynote is not None:

src/arcfutil/aff/parser.py

@@ -71,10 +71,10 @@ def loadline(notestr: str):
     elif keyword == 'arc':
         if paralist[9] == 'true':  # 是否为黑线
             isskyline = True
-        else:
+        elif paralist[9] == 'false':
             isskyline = False
-            if paralist[9] != 'false':
-                raise AffNoteValueError
+        else:   # 支持designant, etc.
+            isskyline = paralist[9]
         if sub_expression:  # arctap读取
             splited = sub_expression.split(',')
             skynotetimelist = [arctap[arctap.index('(') + 1:arctap.rindex(')')] for arctap in splited]