ICU-20119 Additional changes to UTF-8 checking script.

diff --git a/icu4c/source/tools/icu-file-utf8-check.py b/icu4c/source/tools/icu-file-utf8-check.py
new file mode 100755 (executable)
index 0000000..04ba307
--- /dev/null
+++ b/icu4c/source/tools/icu-file-utf8-check.py
@@ -0,0 +1,108 @@
+#! /usr/bin/python -B
+
+# Copyright (C) 2016 and later: Unicode, Inc. and others.
+# License & terms of use: http://www.unicode.org/copyright.html
+
+# Copyright (C) 2009-2011, International Business Machines Corporation, Google and Others.
+# All rights reserved.
+
+#
+#  Script to check that ICU source files contain only valid UTF-8 encoded text,
+#  and that all files except '.txt' files do not contain a Byte Order Mark (BOM).
+#
+#  THIS SCRIPT DOES NOT WORK ON WINDOWS
+#     It only works correctly on platforms where the native line ending is a plain \n
+#
+#  usage:
+#     icu-svnprops-check.py  [options]
+#
+#  options:
+#     -h | --help    Print a usage line and exit.
+#
+#  The tool operates recursively on the directory from which it is run.
+#  Only files from the ICU github repository are checked.
+#  No changes are made to the repository; only the working copy will be altered.
+
+import sys
+import os
+import os.path
+import re
+import getopt
+
+
+def runCommand(cmd):
+    output_file = os.popen(cmd);
+    output_text = output_file.read();
+    exit_status = output_file.close();
+    if exit_status:
+        print >>sys.stderr, '"', cmd, '" failed.  Exiting.'
+        sys.exit(exit_status)
+    return output_text
+
+
+def usage():
+    print "usage: " + sys.argv[0] + " [-h | --help]"
+
+    
+#
+#  File check.         Check source code files for UTF-8 and all except text files for not containing a BOM
+#    file_name:        name of a text file.
+#    is_source:        Flag, set to True if file is a source code file (.c, .cpp, .h, .java).
+#
+def check_file(file_name, is_source):
+    f = open(file_name, 'r')
+    bytes = f.read()
+    f.close()
+
+    if is_source:
+        try:
+            bytes.decode("UTF-8")
+        except UnicodeDecodeError:
+            print "Error: %s is a source code file but contains non-utf-8 bytes." % file_name
+    
+    if ord(bytes[0]) == 0xef:
+        if not (file_name.endswith(".txt") or file_name.endswith(".sln")
+                    or file_name.endswith(".targets")
+                    or ".vcxproj" in file_name):
+            print "Warning: file %s contains a UTF-8 BOM: " % file_name
+
+    return
+
+def main(argv):
+    try:
+        opts, args = getopt.getopt(argv, "h", ("help"))
+    except getopt.GetoptError:
+        print "unrecognized option: " + argv[0]
+        usage()
+        sys.exit(2)
+    for opt, arg in opts:
+        if opt in ("-h", "--help"):
+            usage()
+            sys.exit()
+    if args:
+        print "unexpected command line argument"
+        usage()
+        sys.exit()
+
+    output = runCommand("git ls-files ");
+    file_list = output.splitlines()
+
+    source_file_re = re.compile(".*((?:\\.c$)|(?:\\.cpp$)|(?:\\.h$)|(?:\\.java$))")
+    
+    for f in file_list:
+        if os.path.isdir(f):
+            print "Skipping dir " + f
+            continue
+        if not os.path.isfile(f):
+            print "Repository file not in working copy: " + f
+            continue;
+
+        if source_file_re.match(f):
+            source_file = True
+            check_file(f, source_file);
+        else:
+            source_file = False
+            check_file(f, source_file)
+
+if __name__ == "__main__":
+    main(sys.argv[1:])