Dependancy check for .proto files is added.

checkdeps/proto_checker.py

Index: checkdeps/proto_checker.py
diff --git a/checkdeps/proto_checker.py b/checkdeps/proto_checker.py
new file mode 100644
index 0000000000000000000000000000000000000000..fdd58209e7c1e97e2aa16d1b27faa5c2e0979e89
--- /dev/null
+++ b/checkdeps/proto_checker.py
@@ -0,0 +1,114 @@
+# 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.
+
+"""Checks protobuf files for illegal imports."""
+
+import codecs
+import os
+import re
+
+import results
+from rules import Rule, MessageRule
+
+
+class ProtoChecker(object):
+
+  EXTENSIONS = [
+      '.proto',
+  ]
+
+  # The maximum number of non-import lines we can see before giving up.
+  _MAX_UNINTERESTING_LINES = 50
+
+  # The maximum line length, this is to be efficient in the case of very long
+  # lines (which can't be import).
+  _MAX_LINE_LENGTH = 128
+
+  # This regular expression will be used to extract filenames from import
+  # statements.
+  _EXTRACT_IMPORT_PATH = re.compile(
+      '[ \t]*[ \t]*import[ \t]+"(.*)"')
+
+  def __init__(self, verbose, resolve_dotdot=False, root_dir=''):
+    self._verbose = verbose
+    self._resolve_dotdot = resolve_dotdot
+    self._root_dir = root_dir
+
+  def CheckLine(self, rules, line, dependee_path, fail_on_temp_allow=False):
+    """Checks the given line with the given rule set.
+
+    Returns a tuple (is_import, dependency_violation) where
+    is_import is True only if the line is an import
+    statement, and dependency_violation is an instance of
+    results.DependencyViolation if the line violates a rule, or None
+    if it does not.
+    """
+    found_item = self._EXTRACT_IMPORT_PATH.match(line)
+    if not found_item:
+      return False, None  # Not a match
+
+    import_path = found_item.group(1)
+
+    if '\\' in import_path:
+      return True, results.DependencyViolation(
+          import_path,
+          MessageRule('Import paths may not include backslashes.'),
+          rules)
+
+    if '/' not in import_path:
+      # Don't fail when no directory is specified. We may want to be more
+      # strict about this in the future.
+      if self._verbose:
+        print ' WARNING: import specified with no directory: ' + import_path
+      return True, None
+
+    if self._resolve_dotdot and '../' in import_path:
+      dependee_dir = os.path.dirname(dependee_path)
+      import_path = os.path.join(dependee_dir, import_path)
+      import_path = os.path.relpath(import_path, self._root_dir)
+
+    rule = rules.RuleApplyingTo(import_path, dependee_path)
+    if (rule.allow == Rule.DISALLOW or
+        (fail_on_temp_allow and rule.allow == Rule.TEMP_ALLOW)):
+      return True, results.DependencyViolation(import_path, rule, rules)
+    return True, None
+
+  def CheckFile(self, rules, filepath):
+    if self._verbose:
+      print 'Checking: ' + filepath
+
+    dependee_status = results.DependeeStatus(filepath)
+    last_import = 0
+    with codecs.open(filepath, encoding='utf-8') as f:
+      for line_num, line in enumerate(f):
+        if line_num - last_import > self._MAX_UNINTERESTING_LINES:
+          break
+
+        line = line.strip()
+
+        is_import, violation = self.CheckLine(rules, line, filepath)
+        if is_import:
+          last_import = line_num
+        if violation:
+          dependee_status.AddViolation(violation)
+
+    return dependee_status
+
+  @staticmethod
+  def IsProtoFile(file_path):
+    """Returns True iff the given path ends in one of the extensions

[brettw, 2017/01/25 21:12:18]

I find "iff" harder to read and unnecessary (in programming you would never
write "if but not only if" in this type of context. CAn you just use "if"

+    handled by this checker.
+    """
+    return os.path.splitext(file_path)[1] in ProtoChecker.EXTENSIONS
+
+  def ShouldCheck(self, file_path):
+    """Check if the new #include file path should be presubmit checked.
+
+    Args:
+      file_path: file path to be checked
+
+    Return:
+      bool: True if the file should be checked; False otherwise.
+    """
+    return self.IsProtoFile(file_path)