Use jinja2 templating engine for Python code generators

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 15 matching lines @@
 # 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
 
 from in_file import InFile
 import in_generator
 import license
+import template_expander
 
 
-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.
-
-class %(class_name)s {
-public:
-%(method_declarations)s
-private:
-    %(class_name)s() { }
-
-%(storage_declarations)s
-};
-
-} // namespace WebCore
-
-#endif // %(class_name)s_h
-"""
-
-IMPLEMENTATION_TEMPLATE = """%(license)s
-#include "config.h"
-#include "%(class_name)s.h"
-
-namespace WebCore {
-
-%(storage_definitions)s
-
-} // namespace WebCore
-"""
-
 class RuntimeFeatureWriter(in_generator.Writer):
     class_name = "RuntimeEnabledFeatures"
     defaults = {
         'condition' : None,
         'depends_on' : [],
         'default': 'false',
         'custom': False,
     }
 
     def __init__(self, in_file_path):
         super(RuntimeFeatureWriter, self).__init__(in_file_path)
-        self._all_features = self.in_file.name_dictionaries
+        self._features = self.in_file.name_dictionaries
         # Make sure the resulting dictionaries have all the keys we expect.
-        for feature in self._all_features:
+        for feature in self._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)
 
     def _lower_first(self, string):
         lowered = string[0].lower() + string[1:]
         lowered = lowered.replace("cSS", "css")
         lowered = lowered.replace("iME", "ime")
         return lowered
 
-    def _method_declaration(self, feature):
-        if feature['custom']:
-            return "    static bool %(first_lowered_name)sEnabled();\n" % feature
-        unconditional = """    static void set%(name)sEnabled(bool isEnabled) { is%(name)sEnabled = isEnabled; }
-    static bool %(first_lowered_name)sEnabled() { return %(enabled_condition)s; }
-"""
-        conditional = "#if ENABLE(%(condition)s)\n" + unconditional + """#else
-    static void set%(name)sEnabled(bool) { }
-    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):
-        return HEADER_TEMPLATE % {
-            'class_name' : self.class_name,
+        params = {
             '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)),
+            'features' : self._features
         }
-
-    def _storage_definition(self, feature):
-        definition = "bool RuntimeEnabledFeatures::is%(name)sEnabled = %(default)s;" % feature
-        return self.wrap_with_condition(definition, feature['condition'])
+        return template_expander.applytemplate("../page/RuntimeEnabledFeatures.h.tmpl", params)
 
     def generate_implementation(self):
-        return IMPLEMENTATION_TEMPLATE % {
-            'class_name' : self.class_name,
+        params = {
             'license' : license.license_for_generated_cpp(),
-            'storage_definitions' : "\n".join(map(self._storage_definition, self._non_custom_features)),
+            'features' : self._features
         }
+        return template_expander.applytemplate("../page/RuntimeEnabledFeatures.cpp.tmpl", params)
 
 
 if __name__ == "__main__":
     in_generator.Maker(RuntimeFeatureWriter).main(sys.argv)