Relax validation of QssColor values

Fixes #2370

qutebrowser/config/configtypes.py

@@ -694,30 +694,17 @@ class CssColor(BaseType):
 
 class QssColor(CssColor):
 
-    """Base class for a color value.
-
-    Class attributes:
-        color_func_regexes: Valid function regexes.
-    """
-
-    num = r'[0-9]{1,3}%?'
-
-    color_func_regexes = [
-        r'rgb\({num},\s*{num},\s*{num}\)'.format(num=num),
-        r'rgba\({num},\s*{num},\s*{num},\s*{num}\)'.format(num=num),
-        r'hsv\({num},\s*{num},\s*{num}\)'.format(num=num),
-        r'hsva\({num},\s*{num},\s*{num},\s*{num}\)'.format(num=num),
-        r'qlineargradient\(.*\)',
-        r'qradialgradient\(.*\)',
-        r'qconicalgradient\(.*\)',
-    ]
+    """Color used in a Qt stylesheet."""
 
     def validate(self, value):
+        functions = ['rgb', 'rgba', 'hsv', 'hsva', 'qlineargradient',
+                     'qradialgradient', 'qconicalgradient']
         self._basic_validation(value)
         if not value:
             return
-        elif any(re.match(r, value) for r in self.color_func_regexes):
-            # QColor doesn't handle these, so we do the best we can easily
+        elif (any(value.startswith(func + '(') for func in functions) and
+              value.endswith(')')):
+            # QColor doesn't handle these
             pass
         elif QColor.isValidColor(value):
             pass

tests/unit/config/test_configtypes.py

@@ -879,19 +879,16 @@ class ColorTests:
         ('#12', []),
         ('foobar', []),
         ('42', []),
-        ('rgb(1, 2, 3, 4)', []),
         ('foo(1, 2, 3)', []),
+        ('rgb(1, 2, 3', []),
 
         ('rgb(0, 0, 0)', [configtypes.QssColor]),
         ('rgb(0,0,0)', [configtypes.QssColor]),
         ('-foobar(42)', [configtypes.CssColor]),
 
-        ('rgba(255, 255, 255, 255)', [configtypes.QssColor]),
-        ('rgba(255,255,255,255)', [configtypes.QssColor]),
-        ('hsv(359, 255, 255)', [configtypes.QssColor]),
-        ('hsva(359, 255, 255, 255)', [configtypes.QssColor]),
-        ('hsv(10%, 10%, 10%)', [configtypes.QssColor]),
+        ('rgba(255, 255, 255, 1.0)', [configtypes.QssColor]),
         ('hsv(10%,10%,10%)', [configtypes.QssColor]),
+
         ('qlineargradient(x1:0, y1:0, x2:0, y2:1, stop:0 white, '
          'stop: 0.4 gray, stop:1 green)', [configtypes.QssColor]),
         ('qconicalgradient(cx:0.5, cy:0.5, angle:30, stop:0 white, '