add code statistic tool

+#!/usr/bin/python
+'''
+The MIT License (MIT)
+
+Copyright (c) 2013-2014 winlin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+'''
+
+#################################################################################
+# to stat the code and comments lines
+#################################################################################
+import sys
+
+def trace(msg):
+    print msg
+    pass
+def info(msg):
+    print msg
+    pass
+def verbose(msg):
+    #print msg
+    pass
+
+def process(f, code_file):
+    info("process file success")
+    (stat_code, stat_block_comments, stat_line_comments) = (0, 0, 0)
+    is_block_comments = False
+    is_line_comments = False
+    for line in f.readlines():
+        line = line.strip()
+        if is_block_comments:
+            if "*/" in line:
+                verbose("[block][end] %s"%line)
+                is_block_comments = False
+                is_line_comments = False
+            else:
+                verbose("[block][cont] %s"%line)
+            continue
+        if line.startswith("/*"):
+            verbose("[block][start] %s"%line)
+            is_block_comments = True
+            is_line_comments = False
+            stat_block_comments += 1
+            continue
+        if line.startswith("//"):
+            verbose("[line] %s"%line)
+            is_block_comments = False
+            is_line_comments = True
+            stat_line_comments += 1
+            continue
+        verbose("[code] %s"%line)
+        is_block_comments = False
+        is_line_comments = False
+        stat_code += 1
+    total = stat_code + stat_block_comments + stat_line_comments
+    comments = stat_block_comments + stat_line_comments
+    trace("total:%s code:%s comments:%s block:%s line:%s file:%s"%(total, stat_code, comments, stat_block_comments, stat_line_comments, code_file))
+    return (0, total, stat_code, comments, stat_block_comments, stat_line_comments, code_file)
+
+def do_stat(code_file):
+    f = None
+    try:
+        f = open(code_file, "r")
+        info("open file success");
+        return process(f, code_file)
+    finally:
+        if f is not None:
+            f.close()
+            info("close file success")
+    return (-1, 0, 0, 0, 0, 0, None)
+    
+code_file = None
+if __name__ == "__main__":
+    if len(sys.argv) <= 1:
+        print "to stat the code and comments lines"
+        print "Usage: python %s <code_file>"%(sys.argv[0])
+        print "     code_file: the code(header or source) file to stat"
+        print "Example:"
+        print "     python %s src/core/srs_core.hpp"%(sys.argv[0])
+        sys.exit(-1)
+        
+    code_file = sys.argv[1]
+    info("stat %s"%(code_file))
+    do_stat(code_file)