Initial code generation for features.

tools/json_schema_compiler/features_h_generator.py

Index: tools/json_schema_compiler/features_h_generator.py
diff --git a/tools/json_schema_compiler/features_h_generator.py b/tools/json_schema_compiler/features_h_generator.py
new file mode 100644
index 0000000000000000000000000000000000000000..2b407ca16d0f1867a05ba4567fb3c67b4988394e
--- /dev/null
+++ b/tools/json_schema_compiler/features_h_generator.py
@@ -0,0 +1,83 @@
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import os.path
+
+from code import Code
+import cpp_util
+
+
+class HGenerator(object):
+  def Generate(self, features, source_file):
+    return _Generator(features, source_file).Generate()
+
+
+class _Generator(object):
+  """A .cc generator for PermissionFeatures.
+  """
+  def __init__(self, features, source_file):
+    self._feature_defs = cpp_util.RemoveFeatureDuplicates(features)
+    self._source_file = source_file
+    self._source_file_filename, _ = os.path.splitext(source_file)
+
+  def Generate(self):
+    """Generates a Code object for PermissionFeatures.
+    """
+    c = Code()
+    (c.Append(cpp_util.CHROMIUM_LICENSE)
+      .Append()
+      .Append(cpp_util.GENERATED_FEATURE_MESSAGE % self._source_file)
+      .Append()
+    )
+    ifndef_name = cpp_util.GenerateIfndefName(self._source_file_filename,
+                                              "PermissionFeatures")
+    (c.Append('#ifndef %s' % ifndef_name)
+      .Append('#define %s' % ifndef_name)
+      .Append()
+    )
+
+    c.Append('#include <map>')
+
+    (c.Append('class PermissionFeatures {')
+      .Append(' public:')
+      .Sblock()
+      .Concat(self._GenerateBody())
+      .Eblock('};')
+    )
+    (c.Append()
+      .Append('#endif  // %s' % ifndef_name)
+      .Append()
+    )
+    return c
+
+  def _GenerateBody(self):
+    c = Code()
+
+    (c.Append('PermissionFeatures();')
+      .Append())
+
+    (c.Append('enum ID {')
+     .Concat(self._GenerateEnumConstants())
+     .Eblock('};')
+     .Append()
+    )
+
+    # Generate the ToString function.
+    c.Append('static const char* ToString(ID id);')
+
+    # Generate the FromString function.
+    c.Append('static ID FromString(const std::string& id);')
+    return c
+
+  def _GenerateEnumConstants(self):
+    c = Code()
+
+    (c.Sblock()
+      .Append('kUnknown,')
+    )
+    for feature in self._feature_defs:
+      c.Append('%s,' % cpp_util.ConstantName(feature.name))
+    c.Append('kEnumBoundary')
+
+    return c