Generate example JSON policy configuration files

tools/grit/grit/format/policy_templates/writers/json_writer.py

Index: tools/grit/grit/format/policy_templates/writers/json_writer.py
diff --git a/tools/grit/grit/format/policy_templates/writers/json_writer.py b/tools/grit/grit/format/policy_templates/writers/json_writer.py
new file mode 100644
index 0000000000000000000000000000000000000000..776e4f5a739e09e0d767ec32697c43a6a7f029fc
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+++ b/tools/grit/grit/format/policy_templates/writers/json_writer.py
@@ -0,0 +1,65 @@
+# Copyright (c) 2010 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.
+
+
+from xml.dom import minidom
+from grit.format.policy_templates.writers import template_writer
+
+
+def GetWriter(config, messages):
+  '''Factory method for creating JsonWriter objects.
+  See the constructor of TemplateWriter for description of
+  arguments.
+  '''
+  return JsonWriter(['linux'], config, messages)
+
+
+class JsonWriter(template_writer.TemplateWriter):
+  '''Class for generating policy files in JSON format (for Linux). The
+  generated files will define all the supported policies with example values
+  set for them. This class is used by PolicyTemplateGenerator to write .json
+  files.
+  '''
+
+  def WritePolicy(self, policy):
+    example_value = policy['annotations']['example_value']
+    if policy['type'] == 'string':
+      example_value_str = '"' + example_value + '"'
+    elif policy['type'] == 'list':
+      if example_value == []:
+        example_value_str = '[]'
+      else:
+        example_value_str = '["%s"]' % '", "'.join(example_value)
+    elif policy['type'] == 'main':
+      if example_value == True:
+        example_value_str = 'true'
+      else:
+        example_value_str = 'false'
+    elif policy['type'] == 'enum':
+      example_value_str = example_value
+    else:
+      raise Exception('unknown policy type %s:' % policy['type'])
+
+    # Add comme to the end of the previous line.
+    if not self._first_written:
+      self._out[-1] += ','
+
+    line = '  "%s": %s' % (policy['name'], example_value_str)
+    self._out.append(line)
+
+    self._first_written = False
+
+  def BeginTemplate(self):
+    self._out.append('{')
+
+  def EndTemplate(self):
+    self._out.append('}')
+
+  def Init(self):
+    self._out = []
+    # The following boolean member is true until the first policy is written.
+    self._first_written = True
+
+  def GetTemplateText(self):
+    return '\n'.join(self._out)