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#! /usr/bin/env python
# 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, regex, regsub, string, getopt, os
p_define = regex.compile('^[\t ]*#[\t ]*define[\t ]+\([a-zA-Z0-9_]+\)[\t ]+')
p_macro = regex.compile(
'^[\t ]*#[\t ]*define[\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_comment = regex.compile('/\*\([^*]+\|\*+[^/]\)*\(\*+/\)?')
ignores = [p_comment]
p_char = regex.compile("'\(\\\\.[^\\\\]*\|[^\\\\]\)'")
filedict = {}
try:
searchdirs=string.splitfields(os.environ['include'],';')
except KeyError:
try:
searchdirs=string.splitfields(os.environ['INCLUDE'],';')
except KeyError:
searchdirs=['/usr/include']
def main():
opts, args = getopt.getopt(sys.argv[1:], 'i:')
for o, a in opts:
if o == '-i':
ignores.append(regex.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 = string.rfind(outfile, '.')
if i > 0: outfile = outfile[:i]
outfile = string.upper(outfile)
outfile = outfile + '.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
break
process(fp, outfp)
outfp.close()
fp.close()
def process(fp, outfp, env = {}):
lineno = 0
while 1:
line = fp.readline()
if not line: break
lineno = lineno + 1
n = p_define.match(line)
if n >= 0:
# 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:]
# replace ignored patterns by spaces
for p in ignores:
body = regsub.gsub(p, ' ', body)
# replace char literals by ord(...)
body = regsub.gsub(p_char, 'ord(\\0)', body)
stmt = '%s = %s\n' % (name, string.strip(body))
ok = 0
try:
exec stmt in env
except:
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:]
for p in ignores:
body = regsub.gsub(p, ' ', body)
body = regsub.gsub(p_char, 'ord(\\0)', 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)
if p_include.match(line) >= 0:
regs = p_include.regs
a, b = regs[1]
filename = line[a:b]
if not filedict.has_key(filename):
filedict[filename] = None
inclfp = None
for dir in searchdirs:
try:
inclfp = open(dir + '/' + filename, 'r')
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' % filename)
main()
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