python-3.6.zip added from Github

README.cosmo contains the necessary links.

third_party/python/Tools/scripts/ifdef.py

@@ -0,0 +1,112 @@
+#! /usr/bin/env python3
+
+# Selectively preprocess #ifdef / #ifndef statements.
+# Usage:
+# ifdef [-Dname] ... [-Uname] ... [file] ...
+#
+# This scans the file(s), looking for #ifdef and #ifndef preprocessor
+# commands that test for one of the names mentioned in the -D and -U
+# options.  On standard output it writes a copy of the input file(s)
+# minus those code sections that are suppressed by the selected
+# combination of defined/undefined symbols.  The #if(n)def/#else/#else
+# lines themselves (if the #if(n)def tests for one of the mentioned
+# names) are removed as well.
+
+# Features: Arbitrary nesting of recognized and unrecognized
+# preprocessor statements works correctly.  Unrecognized #if* commands
+# are left in place, so it will never remove too much, only too
+# little.  It does accept whitespace around the '#' character.
+
+# Restrictions: There should be no comments or other symbols on the
+# #if(n)def lines.  The effect of #define/#undef commands in the input
+# file or in included files is not taken into account.  Tests using
+# #if and the defined() pseudo function are not recognized.  The #elif
+# command is not recognized.  Improperly nesting is not detected.
+# Lines that look like preprocessor commands but which are actually
+# part of comments or string literals will be mistaken for
+# preprocessor commands.
+
+import sys
+import getopt
+
+defs = []
+undefs = []
+
+def main():
+    opts, args = getopt.getopt(sys.argv[1:], 'D:U:')
+    for o, a in opts:
+        if o == '-D':
+            defs.append(a)
+        if o == '-U':
+            undefs.append(a)
+    if not args:
+        args = ['-']
+    for filename in args:
+        if filename == '-':
+            process(sys.stdin, sys.stdout)
+        else:
+            f = open(filename, 'r')
+            process(f, sys.stdout)
+            f.close()
+
+def process(fpi, fpo):
+    keywords = ('if', 'ifdef', 'ifndef', 'else', 'endif')
+    ok = 1
+    stack = []
+    while 1:
+        line = fpi.readline()
+        if not line: break
+        while line[-2:] == '\\\n':
+            nextline = fpi.readline()
+            if not nextline: break
+            line = line + nextline
+        tmp = line.strip()
+        if tmp[:1] != '#':
+            if ok: fpo.write(line)
+            continue
+        tmp = tmp[1:].strip()
+        words = tmp.split()
+        keyword = words[0]
+        if keyword not in keywords:
+            if ok: fpo.write(line)
+            continue
+        if keyword in ('ifdef', 'ifndef') and len(words) == 2:
+            if keyword == 'ifdef':
+                ko = 1
+            else:
+                ko = 0
+            word = words[1]
+            if word in defs:
+                stack.append((ok, ko, word))
+                if not ko: ok = 0
+            elif word in undefs:
+                stack.append((ok, not ko, word))
+                if ko: ok = 0
+            else:
+                stack.append((ok, -1, word))
+                if ok: fpo.write(line)
+        elif keyword == 'if':
+            stack.append((ok, -1, ''))
+            if ok: fpo.write(line)
+        elif keyword == 'else' and stack:
+            s_ok, s_ko, s_word = stack[-1]
+            if s_ko < 0:
+                if ok: fpo.write(line)
+            else:
+                s_ko = not s_ko
+                ok = s_ok
+                if not s_ko: ok = 0
+                stack[-1] = s_ok, s_ko, s_word
+        elif keyword == 'endif' and stack:
+            s_ok, s_ko, s_word = stack[-1]
+            if s_ko < 0:
+                if ok: fpo.write(line)
+            del stack[-1]
+            ok = s_ok
+        else:
+            sys.stderr.write('Unknown keyword %s\n' % keyword)
+    if stack:
+        sys.stderr.write('stack: %s\n' % stack)
+
+if __name__ == '__main__':
+    main()