Added validation

diegopetrola · diegopetrola · commit 5c84526a1b99 · 2020-07-29T16:42:03.000-03:00
diff --git a/lib/matplotlib/font_manager.py b/lib/matplotlib/font_manager.py
@@ -41,6 +41,7 @@
 from matplotlib import afm, cbook, ft2font, rcParams
 from matplotlib.fontconfig_pattern import (
     parse_fontconfig_pattern, generate_fontconfig_pattern)
+from matplotlib.rcsetup import _validators
 
 _log = logging.getLogger(__name__)
 
@@ -694,7 +695,6 @@ def __init__(self,
         self._stretch = rcParams['font.stretch']
         self._size = rcParams['font.size']
         self._file = None
-        self._mathtext_fontset = rcParams['mathtext.fontset']
 
         if isinstance(family, str):
             # Treat family as a fontconfig pattern if it is the only
@@ -950,19 +950,15 @@ def set_mathtext_fontset(self, fontset):
         See Also
         --------
         .text.set_mathtext_fontset
-        
-        TO DO: make the same validations as made when atributing a fontset
-        to the rcParams[]
         """
-        
-        #if fontset not in _validators()
-        
-        self._mathtext_fontset = \
-                rcParams["mathtext.fontset"] if fontset is None else fontset
-        
-        
-        
-            
+        if fontset is None:
+            self._mathtext_fontset = rcParams['mathtext.fontset']
+            return
+        #this function validates the parameter fontset just as if it were
+        #passed to rcParams['mathtext.fontset']
+        _validators['mathtext.fontset'](fontset)
+        self._mathtext_fontset = fontset       
+
     def copy(self):
         """Return a copy of self."""
         new = type(self)()
