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#! /usr/bin/python2.7 # Read #define's and translate to Python code. # Handle #include statements. # Handle #define macros with one argument. # Anything that isn't recognized or doesn't translate into valid # Python is ignored. # Without filename arguments, acts as a filter. # If one or more filenames are given, output is written to corresponding # filenames in the local directory, translated to all uppercase, with # the extension replaced by ".py". # By passing one or more options of the form "-i regular_expression" # you can specify additional strings to be ignored. This is useful # e.g. to ignore casts to u_long: simply specify "-i '(u_long)'". # XXX To do: # - turn trailing C comments into Python comments # - turn C Boolean operators "&& || !" into Python "and or not" # - what to do about #if(def)? # - what to do about macros with multiple parameters? import sys, re, getopt, os p_define = re.compile('^[\t ]*#[\t ]*define[\t ]+([a-zA-Z0-9_]+)[\t ]+') p_macro = re.compile( '^[\t ]*#[\t ]*define[\t ]+' '([a-zA-Z0-9_]+)\(([_a-zA-Z][_a-zA-Z0-9]*)\)[\t ]+') p_include = re.compile('^[\t ]*#[\t ]*include[\t ]+<([^>\n]+)>') p_comment = re.compile(r'/\*([^*]+|\*+[^/])*(\*+/)?') p_cpp_comment = re.compile('//.*') ignores = [p_comment, p_cpp_comment] p_char = re.compile(r"'(\\.[^\\]*|[^\\])'") p_hex = re.compile(r"0x([0-9a-fA-F]+)L?") filedict = {} importable = {} try: searchdirs=os.environ['include'].split(';') except KeyError: try: searchdirs=os.environ['INCLUDE'].split(';') except KeyError: try: if sys.platform.find("beos") == 0: searchdirs=os.environ['BEINCLUDES'].split(';') elif sys.platform.startswith("atheos"): searchdirs=os.environ['C_INCLUDE_PATH'].split(':') else: raise KeyError except KeyError: searchdirs=['/usr/include'] try: searchdirs.insert(0, os.path.join('/usr/include', os.environ['MULTIARCH'])) except KeyError: pass def main(): global filedict opts, args = getopt.getopt(sys.argv[1:], 'i:') for o, a in opts: if o == '-i': ignores.append(re.compile(a)) if not args: args = ['-'] for filename in args: if filename == '-': sys.stdout.write('# Generated by h2py from stdin\n') process(sys.stdin, sys.stdout) else: fp = open(filename, 'r') outfile = os.path.basename(filename) i = outfile.rfind('.') if i > 0: outfile = outfile[:i] 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() fp.close() def pytify(body): # replace ignored patterns by spaces for p in ignores: body = p.sub(' ', body) # replace char literals by ord(...) body = p_char.sub("ord('\\1')", body) # Compute negative hexadecimal constants start = 0 UMAX = 2*(sys.maxint+1) while 1: m = p_hex.search(body, start) if not m: break s,e = m.span() val = long(body[slice(*m.span(1))], 16) if val > sys.maxint: val -= UMAX body = body[:s] + "(" + str(val) + ")" + body[e:] start = s + 1 return body def process(fp, outfp, env = {}): lineno = 0 while 1: line = fp.readline() if not line: break lineno = lineno + 1 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 = match.group(1) body = line[match.end():] body = pytify(body) ok = 0 stmt = '%s = %s\n' % (name, body.strip()) try: exec stmt in env except: sys.stderr.write('Skipping: %s' % stmt) else: outfp.write(stmt) match = p_macro.match(line) if match: macro, arg = match.group(1, 2) body = line[match.end():] body = pytify(body) stmt = 'def %s(%s): return %s\n' % (macro, arg, body) try: exec stmt in env except: sys.stderr.write('Skipping: %s' % stmt) else: outfp.write(stmt) match = p_include.match(line) if match: regs = match.regs a, b = regs[1] filename = line[a:b] if importable.has_key(filename): outfp.write('from %s import *\n' % importable[filename]) elif not filedict.has_key(filename): filedict[filename] = None inclfp = None for dir in searchdirs: try: inclfp = open(dir + '/' + filename) break except IOError: pass if inclfp: outfp.write( '\n# Included from %s\n' % filename) process(inclfp, outfp, env) else: sys.stderr.write('Warning - could not find file %s\n' % filename) if __name__ == '__main__': main()