Examples - h2py.py - Revision history

PeterHarding at 07:10, 13 June 2008

2008-06-13T07:10:12Z

← Older revision		Revision as of 17:10, 13 June 2008
Line 188:		Line 188:
	#-------------------------------------------------------------------------------		#-------------------------------------------------------------------------------

	main()		if __name__ == "__main__":
			main(sys.argv[1:])

	#-------------------------------------------------------------------------------		#-------------------------------------------------------------------------------

PeterHarding at 07:06, 13 June 2008

2008-06-13T07:06:53Z

@@ Line 191: / Line 191: @@
 #-------------------------------------------------------------------------------
 </pre>
 [[Category:Python]]
 [[Category:Examples]]

PeterHarding: New page: =Transliterate C Include Files into Python Code=

 #!/usr/bin/env python # #  $Id:$ #   #-------------------------------------------------------------------------------  """    Read #...

2008-06-13T07:04:51Z

New page: =Transliterate C Include Files into Python Code= <pre> #!/usr/bin/env python # # $Id:$ # #------------------------------------------------------------------------------- """ Read #...

New page

=Transliterate C Include Files into Python Code=

<pre>
#!/usr/bin/env python
#
# $Id:$
#
#-------------------------------------------------------------------------------

"""
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 os, re, sys, getopt

#-------------------------------------------------------------------------------

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 ]+<([a-zA-Z0-9_/\.]+)')

p_comment = re.compile(r'/\*([^*]+|\*+[^/])*(\*+/)?')
p_cpp_comment = re.compile('//.*')

ignores = [p_comment, p_cpp_comment]

p_char = re.compile(r"'(\\.[^\\]*|[^\\])'")

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(';')
else:
raise KeyError
except KeyError:
searchdirs=['/usr/include']

#-------------------------------------------------------------------------------

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():]
# replace ignored patterns by spaces
for p in ignores:
body = p.sub(' ', body)
# replace char literals by ord(...)
body = p_char.sub('ord(\\0)', body)
stmt = '%s = %s\n' % (name, body.strip())
ok = 0
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():]
for p in ignores:
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
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)

#-------------------------------------------------------------------------------

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()

#-------------------------------------------------------------------------------

main()

#-------------------------------------------------------------------------------
</pre>

[[Category:Python]]
[[Category:Examples]]