Revert of Revert of Remove now obsolete checkdeps copy

tools/checkdeps/cpp_checker.py

Index: tools/checkdeps/cpp_checker.py
diff --git a/tools/checkdeps/cpp_checker.py b/tools/checkdeps/cpp_checker.py
deleted file mode 100644
index 94fd37a92145a7e3b0c829c303680dfff500363c..0000000000000000000000000000000000000000
--- a/tools/checkdeps/cpp_checker.py
+++ /dev/null
@@ -1,113 +0,0 @@
-# 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 C++ and Objective-C files for illegal includes."""
-
-import codecs
-import os
-import re
-
-import results
-from rules import Rule, MessageRule
-
-
-class CppChecker(object):
-
-  EXTENSIONS = [
-      '.h',
-      '.cc',
-      '.cpp',
-      '.m',
-      '.mm',
-  ]
-
-  # The maximum number of non-include 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 #includes).
-  _MAX_LINE_LENGTH = 128
-
-  # This regular expression will be used to extract filenames from include
-  # statements.
-  _EXTRACT_INCLUDE_PATH = re.compile(
-      '[ \t]*#[ \t]*(?:include|import)[ \t]+"(.*)"')
-
-  def __init__(self, verbose):
-    self._verbose = verbose
-
-  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_include, dependency_violation) where
-    is_include is True only if the line is an #include or #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_INCLUDE_PATH.match(line)
-    if not found_item:
-      return False, None  # Not a match
-
-    include_path = found_item.group(1)
-
-    if '\\' in include_path:
-      return True, results.DependencyViolation(
-          include_path,
-          MessageRule('Include paths may not include backslashes.'),
-          rules)
-
-    if '/' not in include_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: include specified with no directory: ' + include_path
-      return True, None
-
-    rule = rules.RuleApplyingTo(include_path, dependee_path)
-    if (rule.allow == Rule.DISALLOW or
-        (fail_on_temp_allow and rule.allow == Rule.TEMP_ALLOW)):
-      return True, results.DependencyViolation(include_path, rule, rules)
-    return True, None
-
-  def CheckFile(self, rules, filepath):
-    if self._verbose:
-      print 'Checking: ' + filepath
-
-    dependee_status = results.DependeeStatus(filepath)
-    ret_val = ''  # We'll collect the error messages in here
-    last_include = 0
-    with codecs.open(filepath, encoding='utf-8') as f:
-      in_if0 = 0
-      for line_num, line in enumerate(f):
-        if line_num - last_include > self._MAX_UNINTERESTING_LINES:
-          break
-
-        line = line.strip()
-
-        # Check to see if we're at / inside an #if 0 block
-        if line.startswith('#if 0'):
-          in_if0 += 1
-          continue
-        if in_if0 > 0:
-          if line.startswith('#if'):
-            in_if0 += 1
-          elif line.startswith('#endif'):
-            in_if0 -= 1
-          continue
-
-        is_include, violation = self.CheckLine(rules, line, filepath)
-        if is_include:
-          last_include = line_num
-        if violation:
-          dependee_status.AddViolation(violation)
-
-    return dependee_status
-
-  @staticmethod
-  def IsCppFile(file_path):
-    """Returns True iff the given path ends in one of the extensions
-    handled by this checker.
-    """
-    return os.path.splitext(file_path)[1] in CppChecker.EXTENSIONS