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#! /usr/local/bin/python
# Read #define's from stdin and translate to Python code on stdout.
# Very primitive: non-#define's are ignored, as is anything that isn't
# valid Python as it stands.
# 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 string quotes into Python comments
# - turn C Boolean operators "&& || !" into Python "and or not"
# - what to do about #if(def)?
# - what to do about #include?
# - what to do about macros with parameters?
# - reject definitions with semicolons in them
import sys, regex, string, getopt, os
p_define = regex.compile('^#[\t ]*define[\t ]+\([a-zA-Z0-9_]+\)[\t ]+')
p_comment = regex.compile('/\*\([^*]+\|\*+[^/]\)*\(\*+/\)?')
ignores = [p_comment]
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)
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
# gobble up continuation lines
while line[-2:] == '\\\n':
nextline = fp.readline()
if not nextline: break
lineno = lineno + 1
line = line + nextline
n = p_define.match(line)
if n >= 0:
name = p_define.group(1)
body = line[n:]
# replace ignored patterns by spaces
for p in ignores:
while p.search(body) >= 0:
a, b = p.regs[0]
body = body[:a] + ' ' + body[b:]
stmt = '%s = %s\n' % (name, string.strip(body))
ok = 0
try:
exec stmt in env
ok = 1
except:
sys.stderr.write('Skipping: %s' % stmt)
if ok:
outfp.write(stmt)
main()
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