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#!/usr/bin/env python2.7
# Copyright 2015 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""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()
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