#!/usr/bin/env python
# File: convert_comments.py
# Copyright (C) WANG Cong <xiyou.wangcong@gmail.com>
# GPLv2 applies.

import os, sys

def find_double_slash(str):
	global inComment
	inString = 0
	i = 0
	for i in range(len(str)):
		if str[i]=='\"':
			if i==0 or str[i-1]!='\\':
				if inString:
					inString = 0
				else:
					inString = 1
		if str[i]=='/':
			if i==0 or str[i-1]!='\\':
				if str[i+1]=='*':
					if not inString:
						inComment = 1
				if str[i+1]=='/':
					if (not inString) and (not inComment):
						break
			if str[i-1]=='*':
				if not inString:
					inComment = 0
	if str[i]!='\n':
		j = str.find('/*')
		if i+1 < j:
			print "Warning: // comment contains /**/!"
			return -1
		else:
			return i
	return -1
		
def convert(str, n):
	s = str[n:]
	r = s.replace('//','/*', 1)
	p = r.replace('\n','*/\n')
	return str[0:n] + p

def usage():
	print sys.argv[0] + ": $from_file $to_file."

def main():
	if len(sys.argv)!=3:
		usage()
		sys.exit(1)
	elif sys.argv[1]==sys.argv[2]:
		print "Please don't specify the same file."
		sys.exit(2)
	else:
		try:
			rf = open(sys.argv[1], 'r+')
			wf = open(sys.argv[2], 'wa')
		except:
			print "File specified is not existed."
			sys.exit(2)
		else:
			line = rf.readline()
			while line != '':
				k = find_double_slash(line)
				if k != -1:
					#print "before:"+line
					line = convert(line, k)
					#print "after:"+line
				wf.write(line)
				line = rf.readline()
			rf.close()
			wf.close()
		return
inComment = 0
main()