Initial checkin of gRPC to third_party/

third_party/grpc/src/objective-c/change-comments.py

Index: third_party/grpc/src/objective-c/change-comments.py
diff --git a/third_party/grpc/src/objective-c/change-comments.py b/third_party/grpc/src/objective-c/change-comments.py
new file mode 100755
index 0000000000000000000000000000000000000000..9aa0e0c9f5a196ff66f0269a907528d2a2244d43
--- /dev/null
+++ b/third_party/grpc/src/objective-c/change-comments.py
@@ -0,0 +1,128 @@
+#!/usr/bin/env python2.7
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Change comments style of source files from // to /** */"""
+
+import re
+import sys
+
+
+if len(sys.argv) < 2:
+  print("Please provide at least one source file name as argument.")
+  sys.exit()
+
+for file_name in sys.argv[1:]:
+
+  print("Modifying format of {file} comments in place...".format(
+      file=file_name,
+  ))
+
+
+  # Input
+
+  with open(file_name, "r") as input_file:
+    lines = input_file.readlines()
+
+  def peek():
+    return lines[0]
+
+  def read_line():
+    return lines.pop(0)
+
+  def more_input_available():
+    return lines
+
+
+  # Output
+
+  output_lines = []
+
+  def write(line):
+    output_lines.append(line)
+
+  def flush_output():
+    with open(file_name, "w") as output_file:
+      for line in output_lines:
+        output_file.write(line)
+
+
+  # Pattern matching
+
+  comment_regex = r'^(\s*)//\s(.*)$'
+
+  def is_comment(line):
+    return re.search(comment_regex, line)
+
+  def isnt_comment(line):
+    return not is_comment(line)
+
+  def next_line(predicate):
+    return more_input_available() and predicate(peek())
+
+
+  # Transformation
+
+  def indentation_of(line):
+    match = re.search(comment_regex, line)
+    return match.group(1)
+
+  def content(line):
+    match = re.search(comment_regex, line)
+    return match.group(2)
+
+  def format_as_block(comment_block):
+    if len(comment_block) == 0:
+      return []
+
+    indent = indentation_of(comment_block[0])
+
+    if len(comment_block) == 1:
+      return [indent + "/** " + content(comment_block[0]) + " */\n"]
+
+    block = ["/**"] + [" * " + content(line) for line in comment_block] + [" */"]
+    return [indent + line.rstrip() + "\n" for line in block]
+
+
+  # Main algorithm
+
+  while more_input_available():
+    while next_line(isnt_comment):
+      write(read_line())
+
+    comment_block = []
+    # Get all lines in the same comment block. We could restrict the indentation
+    # to be the same as the first line of the block, but it's probably ok.
+    while (next_line(is_comment)):
+      comment_block.append(read_line())
+
+    for line in format_as_block(comment_block):
+      write(line)
+
+  flush_output()