GTTF: Make checkdeps.py produce JSON output that can be used in a recipe.

tools/checkdeps/results.py

 # Copyright (c) 2012 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.
 
 
 """Results object and results formatters for checkdeps tool."""
 
 
+import json
+
+
 class DependencyViolation(object):
   """A single dependency violation."""
 
   def __init__(self, include_path, violated_rule, rules):
     # The include or import path that is in violation of a rule.
     self.include_path = include_path
 
     # The violated rule.
     self.violated_rule = violated_rule
 
@@ skipping 72 matching lines @@
   def GetResults(self):
     return self.results
 
   def PrintResults(self):
     for result in self.results:
       print result
     if self.results:
       print '\nFAILED\n'
 
 
+class JSONResultsFormatter(ResultsFormatter):
+  """A results formatter that outputs results to a file as JSON."""
+
+  def __init__(self, output_path, wrapped_formatter=None):
+    self.output_path = output_path
+    self.wrapped_formatter = wrapped_formatter
+
+    self.results = []
+
+  def AddError(self, dependee_status):
+    self.results.append({
+        'dependee_path': dependee_status.dependee_path,
+        'violations': [{
+            'include_path': violation.include_path,
+            'violated_rule': violation.violated_rule.AsDependencyTuple(),
+        } for violation in dependee_status.violations]
+    })
+
+    if self.wrapped_formatter:
+      self.wrapped_formatter.AddError(dependee_status)
+
+  def GetResults(self):
+    with open(self.output_path, 'w') as f:
+      f.write(json.dumps(self.results))
+
+
+  def PrintResults(self):
+    if self.wrapped_formatter:
+      self.wrapped_formatter.PrintResults()
+      return
+
+    print self.results
+
+
 class TemporaryRulesFormatter(ResultsFormatter):
   """A results formatter that produces a single line per nonconforming
   include. The combined output is suitable for directly pasting into a
   DEPS file as a list of temporary-allow rules.
   """
 
   def __init__(self):
     self.violations = set()
 
   def AddError(self, dependee_status):
@@ skipping 20 matching lines @@
     self.count = 0
 
   def AddError(self, dependee_status):
     self.count += len(dependee_status.violations)
 
   def GetResults(self):
     return '%d' % self.count
 
   def PrintResults(self):
     print self.count