Autogenerate lists of "stable", "experimental" and "test" features from RuntimeEnabledFeatures.in

Source/core/scripts/in_file.py

Index: Source/core/scripts/in_file.py
diff --git a/Source/core/scripts/in_file.py b/Source/core/scripts/in_file.py
index fa7106461ae3bb21df9380a6d51cb03decbe20a6..ea5010d1d4e50a60ee2d5d74c29db8d8373e4270 100644
--- a/Source/core/scripts/in_file.py
+++ b/Source/core/scripts/in_file.py
@@ -53,16 +53,17 @@ def _is_comment(line):
     return line.startswith("//") or line.startswith("#")
 
 class InFile(object):
-    def __init__(self, lines, defaults, default_parameters):
+    def __init__(self, lines, defaults, valid_values=None, default_parameters=None):
         self.name_dictionaries = []
         self.parameters = copy.deepcopy(default_parameters if default_parameters else {})
         self._defaults = defaults
+        self._valid_values = copy.deepcopy(valid_values if valid_values else {})
         self._parse(map(str.strip, lines))
 
     @classmethod
-    def load_from_path(self, path, defaults, default_parameters):
+    def load_from_path(self, path, defaults, valid_values, default_parameters):
         with open(os.path.abspath(path)) as in_file:
-            return InFile(in_file.readlines(), defaults, default_parameters)
+            return InFile(in_file.readlines(), defaults, valid_values, default_parameters)
 
     def _is_sequence(self, arg):
         return (not hasattr(arg, "strip")
@@ -107,6 +108,9 @@ class InFile(object):
                 arg_name, arg_value = arg_string, True
             if arg_name not in self._defaults:
                 self._fatal("Unknown argument: '%s' in line:\n%s\nKnown arguments: %s" % (arg_name, line, self._defaults.keys()))
+            valid_values = self._valid_values.get(arg_name)
+            if valid_values and arg_value not in valid_values:
+                self._fatal("Unknown value: '%s' in line:\n%s\nKnown values: %s" % (arg_value, line, valid_values))
             if self._is_sequence(args[arg_name]):
                 args[arg_name].append(arg_value)
             else: