Patch #437683: Use re instead of regex.

If multiple header files are processed simultaneously which include each
other, the corresponding modules mport each other. Specifically, if h2py
is invoked with sys/types.h first, later header files won't contain the
complete contents of TYPES.py.

Tools/scripts/h2py.py

@@ -21,34 +21,35 @@
 # - what to do about #if(def)?
 # - what to do about macros with multiple parameters?
 
-import sys, regex, regsub, string, getopt, os
+import sys, re, getopt, os
 
-p_define = regex.compile('^[\t ]*#[\t ]*define[\t ]+\([a-zA-Z0-9_]+\)[\t ]+')
+p_define = re.compile('^[\t ]*#[\t ]*define[\t ]+([a-zA-Z0-9_]+)[\t ]+')
 
-p_macro = regex.compile(
+p_macro = re.compile(
   '^[\t ]*#[\t ]*define[\t ]+'
-  '\([a-zA-Z0-9_]+\)(\([_a-zA-Z][_a-zA-Z0-9]*\))[\t ]+')
+  '([a-zA-Z0-9_]+)\(([_a-zA-Z][_a-zA-Z0-9]*)\)[\t ]+')
 
-p_include = regex.compile('^[\t ]*#[\t ]*include[\t ]+<\([a-zA-Z0-9_/\.]+\)')
+p_include = re.compile('^[\t ]*#[\t ]*include[\t ]+<([a-zA-Z0-9_/\.]+)')
 
-p_comment = regex.compile('/\*\([^*]+\|\*+[^/]\)*\(\*+/\)?')
-p_cpp_comment = regex.compile('//.*')
+p_comment = re.compile(r'/\*([^*]+|\*+[^/])*(\*+/)?')
+p_cpp_comment = re.compile('//.*')
 
 ignores = [p_comment, p_cpp_comment]
 
-p_char = regex.compile("'\(\\\\.[^\\\\]*\|[^\\\\]\)'")
+p_char = re.compile(r"'(\\.[^\\]*|[^\\])'")
 
 filedict = {}
+importable = {}
 
 try:
-    searchdirs=string.splitfields(os.environ['include'],';')
+    searchdirs=os.environ['include'].splitfields(';')
 except KeyError:
     try:
-        searchdirs=string.splitfields(os.environ['INCLUDE'],';')
+        searchdirs=os.environ['INCLUDE'].splitfields(';')
     except KeyError:
         try:
-            if string.find( sys.platform, "beos" ) == 0:
-                searchdirs=string.splitfields(os.environ['BEINCLUDES'],';')
+            if  sys.platform.find("beos") == 0:
+                searchdirs=os.environ['BEINCLUDES'].splitfields(';')
             else:
                 raise KeyError
         except KeyError:
@@ -59,7 +60,7 @@ def main():
     opts, args = getopt.getopt(sys.argv[1:], 'i:')
     for o, a in opts:
         if o == '-i':
-            ignores.append(regex.compile(a))
+            ignores.append(re.compile(a))
     if not args:
         args = ['-']
     for filename in args:
@@ -69,16 +70,17 @@ def main():
         else:
             fp = open(filename, 'r')
             outfile = os.path.basename(filename)
-            i = string.rfind(outfile, '.')
+            i = outfile.rfind('.')
             if i > 0: outfile = outfile[:i]
-            outfile = string.upper(outfile)
-            outfile = outfile + '.py'
+            modname = outfile.upper()
+            outfile = modname + '.py'
             outfp = open(outfile, 'w')
             outfp.write('# Generated by h2py from %s\n' % filename)
             filedict = {}
             for dir in searchdirs:
                 if filename[:len(dir)] == dir:
                     filedict[filename[len(dir)+1:]] = None  # no '/' trailing
+                    importable[filename[len(dir)+1:]] = modname
                     break
             process(fp, outfp)
             outfp.close()
@@ -90,22 +92,22 @@ def process(fp, outfp, env = {}):
         line = fp.readline()
         if not line: break
         lineno = lineno + 1
-        n = p_define.match(line)
-        if n >= 0:
+        match = p_define.match(line)
+        if match:
             # gobble up continuation lines
             while line[-2:] == '\\\n':
                 nextline = fp.readline()
                 if not nextline: break
                 lineno = lineno + 1
                 line = line + nextline
-            name = p_define.group(1)
-            body = line[n:]
+            name = match.group(1)
+            body = line[match.end():]
             # replace ignored patterns by spaces
             for p in ignores:
-                body = regsub.gsub(p, ' ', body)
+                body = p.sub(' ', body)
             # replace char literals by ord(...)
-            body = regsub.gsub(p_char, 'ord(\\0)', body)
-            stmt = '%s = %s\n' % (name, string.strip(body))
+            body = p_char.sub('ord(\\0)', body)
+            stmt = '%s = %s\n' % (name, body.strip())
             ok = 0
             try:
                 exec stmt in env
@@ -113,13 +115,13 @@ def process(fp, outfp, env = {}):
                 sys.stderr.write('Skipping: %s' % stmt)
             else:
                 outfp.write(stmt)
-        n =p_macro.match(line)
-        if n >= 0:
-            macro, arg = p_macro.group(1, 2)
-            body = line[n:]
+        match = p_macro.match(line)
+        if match:
+            macro, arg = match.group(1, 2)
+            body = line[match.end():]
             for p in ignores:
-                body = regsub.gsub(p, ' ', body)
-            body = regsub.gsub(p_char, 'ord(\\0)', body)
+                body = p.sub(' ', body)
+            body = p_char.sub('ord(\\0)', body)
             stmt = 'def %s(%s): return %s\n' % (macro, arg, body)
             try:
                 exec stmt in env
@@ -127,16 +129,19 @@ def process(fp, outfp, env = {}):
                 sys.stderr.write('Skipping: %s' % stmt)
             else:
                 outfp.write(stmt)
-        if p_include.match(line) >= 0:
-            regs = p_include.regs
+        match = p_include.match(line)
+        if match:
+            regs = match.regs
             a, b = regs[1]
             filename = line[a:b]
-            if not filedict.has_key(filename):
+            if importable.has_key(filename):
+                outfp.write('import %s\n' % importable[filename])
+            elif not filedict.has_key(filename):
                 filedict[filename] = None
                 inclfp = None
                 for dir in searchdirs:
                     try:
-                        inclfp = open(dir + '/' + filename, 'r')
+                        inclfp = open(dir + '/' + filename)
                         break
                     except IOError:
                         pass