mirror of https://github.com/python/cpython
143 lines
3.9 KiB
Python
Executable File
143 lines
3.9 KiB
Python
Executable File
#! /usr/bin/env python
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# Read #define's and translate to Python code.
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# Handle #include statements.
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# Handle #define macros with one argument.
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# Anything that isn't recognized or doesn't translate into valid
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# Python is ignored.
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# Without filename arguments, acts as a filter.
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# If one or more filenames are given, output is written to corresponding
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# filenames in the local directory, translated to all uppercase, with
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# the extension replaced by ".py".
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# By passing one or more options of the form "-i regular_expression"
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# you can specify additional strings to be ignored. This is useful
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# e.g. to ignore casts to u_long: simply specify "-i '(u_long)'".
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# XXX To do:
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# - turn trailing C comments into Python comments
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# - turn C Boolean operators "&& || !" into Python "and or not"
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# - what to do about #if(def)?
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# - what to do about macros with multiple parameters?
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import sys, regex, regsub, string, getopt, os
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p_define = regex.compile('^[\t ]*#[\t ]*define[\t ]+\([a-zA-Z0-9_]+\)[\t ]+')
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p_macro = regex.compile(
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'^[\t ]*#[\t ]*define[\t ]+'
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'\([a-zA-Z0-9_]+\)(\([_a-zA-Z][_a-zA-Z0-9]*\))[\t ]+')
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p_include = regex.compile('^[\t ]*#[\t ]*include[\t ]+<\([a-zA-Z0-9_/\.]+\)')
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p_comment = regex.compile('/\*\([^*]+\|\*+[^/]\)*\(\*+/\)?')
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ignores = [p_comment]
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p_char = regex.compile("'\(\\\\.[^\\\\]*\|[^\\\\]\)'")
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filedict = {}
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try:
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searchdirs=string.splitfields(os.environ['include'],';')
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except KeyError:
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try:
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searchdirs=string.splitfields(os.environ['INCLUDE'],';')
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except KeyError:
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searchdirs=['/usr/include']
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def main():
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opts, args = getopt.getopt(sys.argv[1:], 'i:')
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for o, a in opts:
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if o == '-i':
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ignores.append(regex.compile(a))
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if not args:
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args = ['-']
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for filename in args:
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if filename == '-':
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sys.stdout.write('# Generated by h2py from stdin\n')
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process(sys.stdin, sys.stdout)
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else:
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fp = open(filename, 'r')
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outfile = os.path.basename(filename)
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i = string.rfind(outfile, '.')
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if i > 0: outfile = outfile[:i]
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outfile = string.upper(outfile)
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outfile = outfile + '.py'
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outfp = open(outfile, 'w')
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outfp.write('# Generated by h2py from %s\n' % filename)
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filedict = {}
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for dir in searchdirs:
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if filename[:len(dir)] == dir:
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filedict[filename[len(dir)+1:]] = None # no '/' trailing
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break
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process(fp, outfp)
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outfp.close()
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fp.close()
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def process(fp, outfp, env = {}):
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lineno = 0
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while 1:
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line = fp.readline()
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if not line: break
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lineno = lineno + 1
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n = p_define.match(line)
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if n >= 0:
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# gobble up continuation lines
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while line[-2:] == '\\\n':
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nextline = fp.readline()
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if not nextline: break
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lineno = lineno + 1
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line = line + nextline
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name = p_define.group(1)
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body = line[n:]
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# replace ignored patterns by spaces
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for p in ignores:
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body = regsub.gsub(p, ' ', body)
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# replace char literals by ord(...)
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body = regsub.gsub(p_char, 'ord(\\0)', body)
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stmt = '%s = %s\n' % (name, string.strip(body))
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ok = 0
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try:
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exec stmt in env
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except:
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sys.stderr.write('Skipping: %s' % stmt)
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else:
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outfp.write(stmt)
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n =p_macro.match(line)
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if n >= 0:
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macro, arg = p_macro.group(1, 2)
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body = line[n:]
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for p in ignores:
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body = regsub.gsub(p, ' ', body)
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body = regsub.gsub(p_char, 'ord(\\0)', body)
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stmt = 'def %s(%s): return %s\n' % (macro, arg, body)
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try:
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exec stmt in env
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except:
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sys.stderr.write('Skipping: %s' % stmt)
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else:
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outfp.write(stmt)
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if p_include.match(line) >= 0:
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regs = p_include.regs
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a, b = regs[1]
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filename = line[a:b]
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if not filedict.has_key(filename):
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filedict[filename] = None
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inclfp = None
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for dir in searchdirs:
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try:
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inclfp = open(dir + '/' + filename, 'r')
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break
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except IOError:
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pass
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if inclfp:
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outfp.write(
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'\n# Included from %s\n' % filename)
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process(inclfp, outfp, env)
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else:
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sys.stderr.write('Warning - could not find file %s' % filename)
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main()
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