Initial code generation for features.

tools/json_schema_compiler/features_cc_generator.py

+# 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 CCGenerator(object):
+  def Generate(self, permission_defs, source_file):
+    return _Generator(permission_defs, source_file).Generate()
+
+
+class _Generator(object):
+  """A .cc generator for PermissionFeatures.
+  """
+  def __init__(self, permission_defs, source_file):
+    self._feature_defs = cpp_util.RemoveFeatureDuplicates(permission_defs)
+    self._source_file = source_file
+    self._source_file_filename = os.path.splitext(source_file)[0]
+
+  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()
+      .Append('#include <string>')
+      .Append()
+      .Append('#include "%s.h"' % self._source_file_filename)
+      .Append()
+      .Append('#include "base/logging.h"')
+      .Append()
+    )
+
+    # Generate the ToString function.
+    (c.Append('std::string PermissionFeatures::ToString(' \
+                  'PermissionFeatures::ID id) {')
+      .Sblock()
+      .Append('switch (id) {')
+      .Sblock()
+    )
+    for feature in self._feature_defs:
+      c.Append('case %s: return "%s";' % (feature.constant_name,
+          feature.name))
+    (c.Append('default: ')

[not at google - send to devlin, 2013/09/12 16:20:43]

no default:, let compiler fail, which.. it shouldn't. have the NOTREACHED/return
"" outside the switch.

[dhnishi (use Chromium), 2013/09/13 17:36:42]

Done.

+      .Sblock()
+      .Append('NOTREACHED();')
+      .Append('return "";')
+      .Eblock()
+    )
+    (c.Eblock()
+      .Append('}')
+      .Eblock()
+      .Append('}')
+      .Append()
+    )
+
+    # Generate the FromString function.
+    (c.Append('PermissionFeatures::ID PermissionFeatures::FromString(' \
+                  'const std::string& id) {')
+      .Sblock()
+    )
+    for feature in self._feature_defs:
+      c.Append('if (id == "%s") return %s;' % (feature.name,
+          feature.constant_name))

[not at google - send to devlin, 2013/09/12 16:20:43]

prefer either:

c.Append('if (id == "%s") return %s' %
    (feature.name, feature.constant_name))

or

c.Append('if (id == "%s") return %s' % (feature.name,
                                        feature.constant_name))

[dhnishi (use Chromium), 2013/09/13 17:36:42]

Done.

+    (c.Append()
+      .Append('NOTREACHED();')
+      .Append('return kUnknown;')
+      .Eblock()
+      .Append('}')
+      .Append()
+    )

[not at google - send to devlin, 2013/09/12 16:20:43]

generate a std::map<std::string, ID> on construction and reference into that so
this isn't looping through every feature.

[dhnishi (use Chromium), 2013/09/13 17:36:42]

Done. I worried that I'm breaking design patterns with my implementation,
though.

+
+    (c.Eblock(None, 1)  # public
+      .Eblock()
+      .Eblock(None, 1)  # class PermissionFeatures

[not at google - send to devlin, 2013/09/12 16:20:43]

not sure what this is

[dhnishi (use Chromium), 2013/09/13 17:36:42]

Whoops. That was a remnant from an older revision.

Removed.

+    )
+    return c