Factor out a base class from RuntimeFeatureWriter

Source/core/scripts/make_runtime_features.py

 #!/usr/bin/env python
 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 11 matching lines @@
 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 import os.path
 import sys
-import shutil
 
 from in_file import InFile
+import in_generator
 import license
 
 
 HEADER_TEMPLATE = """%(license)s
 #ifndef %(class_name)s_h
 #define %(class_name)s_h
 
 namespace WebCore {
 
 // A class that stores static enablers for all experimental features.
@@ skipping 16 matching lines @@
 #include "config.h"
 #include "RuntimeEnabledFeatures.h"
 
 namespace WebCore {
 
 %(storage_definitions)s
 
 } // namespace WebCore
 """
 
-class RuntimeFeatureWriter(object):
+class RuntimeFeatureWriter(in_generator.Writer):
+    defaults = {
+        'condition' : None,
+        'depends_on' : [],
+        'default': 'false',
+        'custom': False,
+    }
+
     def __init__(self, in_file_path):
+        super(RuntimeFeatureWriter, self).__init__(in_file_path)
+
         # Assume that the class should be called the same as the file.
         self.class_name, _ = os.path.splitext(os.path.basename(in_file_path))
-        defaults = {
-            'condition' : None,
-            'depends_on' : [],
-            'default': 'false',
-            'custom': False,
-        }
-        self._all_features = InFile.load_from_path(in_file_path, defaults).name_dictionaries
+        self._all_features = self.in_file.name_dictionaries
         # Make sure the resulting dictionaries have all the keys we expect.
         for feature in self._all_features:
             feature['first_lowered_name'] = self._lower_first(feature['name'])
             # Most features just check their isFooEnabled bool
             # but some depend on more than one bool.
             enabled_condition = "is%sEnabled" % feature['name']
             for dependant_name in feature['depends_on']:
                 enabled_condition += " && is%sEnabled" % dependant_name
             feature['enabled_condition'] = enabled_condition
         self._non_custom_features = filter(lambda feature: not feature['custom'], self._all_features)
@@ skipping 20 matching lines @@
     static bool %(first_lowered_name)sEnabled() { return false; }
 #endif
 """
         template = conditional if feature['condition'] else unconditional
         return template % feature
 
     def _storage_declarations(self, feature):
         declaration = "    static bool is%(name)sEnabled;" % feature
         return self._wrap_with_condition(declaration, feature['condition'])
 
-    def _generate_header(self):
+    def generate_header(self):
         return HEADER_TEMPLATE % {
             'class_name' : self.class_name,
             'license' : license.license_for_generated_cpp(),
             'method_declarations' : "\n".join(map(self._method_declaration, self._all_features)),
             'storage_declarations' : "\n".join(map(self._storage_declarations, self._non_custom_features)),
         }
 
     def _storage_definition(self, feature):
         definition = "bool RuntimeEnabledFeatures::is%(name)sEnabled = %(default)s;" % feature
         return self._wrap_with_condition(definition, feature['condition'])
 
-    def _generate_implementation(self):
+    def generate_implementation(self):
         return IMPLEMENTATION_TEMPLATE % {
             'class_name' : self.class_name,
             'license' : license.license_for_generated_cpp(),
             'storage_definitions' : "\n".join(map(self._storage_definition, self._non_custom_features)),
         }
 
-    def _forcibly_create_text_file_at_path_with_contents(self, file_path, contents):
-        # FIXME: This method can be made less force-full anytime after 6/1/2013.
-        # A gyp error was briefly checked into the tree, causing
-        # a directory to have been generated in place of one of
-        # our output files.  Clean up after that error so that
-        # all users don't need to clobber their output directories.
-        shutil.rmtree(file_path, ignore_errors=True)
-        # The build system should ensure our output directory exists, but just in case.
-        directory = os.path.dirname(file_path)
-        if not os.path.exists(directory):
-            os.makedirs(directory)
-
-        with open(file_path, "w") as file_to_write:
-            file_to_write.write(contents)
-
-    def write_header(self, output_dir):
-        header_path = os.path.join(output_dir, self.class_name + ".h")
-        self._forcibly_create_text_file_at_path_with_contents(header_path, self._generate_header())
-
-    def write_implmentation(self, output_dir):
-        implmentation_path = os.path.join(output_dir, self.class_name + ".cpp")
-        self._forcibly_create_text_file_at_path_with_contents(implmentation_path, self._generate_implementation())
-
-
-class MakeRuntimeFeatures(object):
-    def main(self, argv):
-        script_name = os.path.basename(argv[0])
-        args = argv[1:]
-        if len(args) < 1:
-            print "USAGE: %i INPUT_FILE [OUTPUT_DIRECTORY]" % script_name
-            exit(1)
-        output_dir = args[1] if len(args) > 1 else os.getcwd()
-
-        writer = RuntimeFeatureWriter(args[0])
-        writer.write_header(output_dir)
-        writer.write_implmentation(output_dir)
-
 
 if __name__ == "__main__":
-    MakeRuntimeFeatures().main(sys.argv)
+    in_generator.Maker(RuntimeFeatureWriter).main(sys.argv)