[1924] Generate the python version of constant defs

Generate it from the .cc file, so the are the same.

src/lib/python/isc/util/Makefile.am

@@ -1,6 +1,13 @@
 SUBDIRS = . cio tests
 
-python_PYTHON = __init__.py process.py socketserver_mixin.py file.py
+python_PYTHON = __init__.py process.py socketserver_mixin.py file.py \
+		common_defs.py
+BUILT_SOURCES = common_defs.py
+CLEANFILES = $(BUILT_SOURCES)
+EXTRA_DIST = pythonize_constants.py
+
+common_defs.py: $(top_srcdir)/src/lib/util/common_defs.cc pythonize_constants.py
+	$(PYTHON) $(srcdir)/pythonize_constants.py $(top_srcdir)/src/lib/util/common_defs.cc $@
 
 pythondir = $(pyexecdir)/isc/util
 

src/lib/python/isc/util/pythonize_constants.py

@@ -0,0 +1,50 @@
+
+# Copyright (C) 2011  Internet Systems Consortium.
+#
+# Permission to use, copy, modify, and distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SYSTEMS CONSORTIUM
+# DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
+# INTERNET SYSTEMS CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
+# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
+# FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+# NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
+# WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+import sys
+import re
+
+def die(message):
+    sys.stderr.write(message + "\n")
+    sys.exit(1)
+
+if len(sys.argv) != 3:
+    die("Usage: python3 ./pythonize_constants.py input.cpp output.py")
+
+[filename_in, filename_out] = sys.argv[1:3]
+
+# Ignore preprocessor, namespaces and the ends of namespaces.
+ignore = re.compile('^(#|namespace|})')
+comment = re.compile('^//(.*)')
+constant = re.compile('^[a-zA-Z].*?([a-zA-Z_0-9]+\\s*=.*);')
+
+with open(filename_in) as file_in, open(filename_out, "w") as file_out:
+    file_out.write("# This file is generated from " + filename_in + "\n" +
+                   "# by the pythonize_constants.py script.\n" +
+                   "# Do not edit, all changes will be lost.\n\n")
+    for line in file_in:
+        if ignore.match(line):
+            continue
+        # Mangle comments to be python-like
+        line = comment.sub('#\\1', line)
+        # Extract the constant.
+
+        # TODO: We may want to do something with the true vs. True and
+        # NULL vs. None and such. Left out for now, since none are in
+        # the input file currently.
+        line = constant.sub('\\1', line)
+
+        file_out.write(line)