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1#! /usr/bin/env python
2
3# Read #define's and translate to Python code.
4# Handle #include statements.
5# Handle #define macros with one argument.
6# Anything that isn't recognized or doesn't translate into valid
7# Python is ignored.
8
9# Without filename arguments, acts as a filter.
10# If one or more filenames are given, output is written to corresponding
11# filenames in the local directory, translated to all uppercase, with
12# the extension replaced by ".py".
13
14# By passing one or more options of the form "-i regular_expression"
15# you can specify additional strings to be ignored.  This is useful
16# e.g. to ignore casts to u_long: simply specify "-i '(u_long)'".
17
18# XXX To do:
19# - turn trailing C comments into Python comments
20# - turn C Boolean operators "&& || !" into Python "and or not"
21# - what to do about #if(def)?
22# - what to do about macros with multiple parameters?
23
24import sys, re, getopt, os
25
26p_define = re.compile('^[\t ]*#[\t ]*define[\t ]+([a-zA-Z0-9_]+)[\t ]+')
27
28p_macro = re.compile(
29  '^[\t ]*#[\t ]*define[\t ]+'
30  '([a-zA-Z0-9_]+)\(([_a-zA-Z][_a-zA-Z0-9]*)\)[\t ]+')
31
32p_include = re.compile('^[\t ]*#[\t ]*include[\t ]+<([a-zA-Z0-9_/\.]+)')
33
34p_comment = re.compile(r'/\*([^*]+|\*+[^/])*(\*+/)?')
35p_cpp_comment = re.compile('//.*')
36
37ignores = [p_comment, p_cpp_comment]
38
39p_char = re.compile(r"'(\\.[^\\]*|[^\\])'")
40
41p_hex = re.compile(r"0x([0-9a-fA-F]+)L?")
42
43filedict = {}
44importable = {}
45
46try:
47    searchdirs=os.environ['include'].split(';')
48except KeyError:
49    try:
50        searchdirs=os.environ['INCLUDE'].split(';')
51    except KeyError:
52        try:
53            if  sys.platform.find("beos") == 0:
54                searchdirs=os.environ['BEINCLUDES'].split(';')
55            elif sys.platform.startswith("atheos"):
56                searchdirs=os.environ['C_INCLUDE_PATH'].split(':')
57            else:
58                raise KeyError
59        except KeyError:
60            searchdirs=['/usr/include']
61
62def main():
63    global filedict
64    opts, args = getopt.getopt(sys.argv[1:], 'i:')
65    for o, a in opts:
66        if o == '-i':
67            ignores.append(re.compile(a))
68    if not args:
69        args = ['-']
70    for filename in args:
71        if filename == '-':
72            sys.stdout.write('# Generated by h2py from stdin\n')
73            process(sys.stdin, sys.stdout)
74        else:
75            fp = open(filename, 'r')
76            outfile = os.path.basename(filename)
77            i = outfile.rfind('.')
78            if i > 0: outfile = outfile[:i]
79            modname = outfile.upper()
80            outfile = modname + '.py'
81            outfp = open(outfile, 'w')
82            outfp.write('# Generated by h2py from %s\n' % filename)
83            filedict = {}
84            for dir in searchdirs:
85                if filename[:len(dir)] == dir:
86                    filedict[filename[len(dir)+1:]] = None  # no '/' trailing
87                    importable[filename[len(dir)+1:]] = modname
88                    break
89            process(fp, outfp)
90            outfp.close()
91            fp.close()
92
93def pytify(body):
94    # replace ignored patterns by spaces
95    for p in ignores:
96        body = p.sub(' ', body)
97    # replace char literals by ord(...)
98    body = p_char.sub("ord('\\1')", body)
99    # Compute negative hexadecimal constants
100    start = 0
101    UMAX = 2*(sys.maxint+1)
102    while 1:
103        m = p_hex.search(body, start)
104        if not m: break
105        s,e = m.span()
106        val = long(body[slice(*m.span(1))], 16)
107        if val > sys.maxint:
108            val -= UMAX
109            body = body[:s] + "(" + str(val) + ")" + body[e:]
110        start = s + 1
111    return body
112
113def process(fp, outfp, env = {}):
114    lineno = 0
115    while 1:
116        line = fp.readline()
117        if not line: break
118        lineno = lineno + 1
119        match = p_define.match(line)
120        if match:
121            # gobble up continuation lines
122            while line[-2:] == '\\\n':
123                nextline = fp.readline()
124                if not nextline: break
125                lineno = lineno + 1
126                line = line + nextline
127            name = match.group(1)
128            body = line[match.end():]
129            body = pytify(body)
130            ok = 0
131            stmt = '%s = %s\n' % (name, body.strip())
132            try:
133                exec stmt in env
134            except:
135                sys.stderr.write('Skipping: %s' % stmt)
136            else:
137                outfp.write(stmt)
138        match = p_macro.match(line)
139        if match:
140            macro, arg = match.group(1, 2)
141            body = line[match.end():]
142            body = pytify(body)
143            stmt = 'def %s(%s): return %s\n' % (macro, arg, body)
144            try:
145                exec stmt in env
146            except:
147                sys.stderr.write('Skipping: %s' % stmt)
148            else:
149                outfp.write(stmt)
150        match = p_include.match(line)
151        if match:
152            regs = match.regs
153            a, b = regs[1]
154            filename = line[a:b]
155            if importable.has_key(filename):
156                outfp.write('from %s import *\n' % importable[filename])
157            elif not filedict.has_key(filename):
158                filedict[filename] = None
159                inclfp = None
160                for dir in searchdirs:
161                    try:
162                        inclfp = open(dir + '/' + filename)
163                        break
164                    except IOError:
165                        pass
166                if inclfp:
167                    outfp.write(
168                            '\n# Included from %s\n' % filename)
169                    process(inclfp, outfp, env)
170                else:
171                    sys.stderr.write('Warning - could not find file %s\n' %
172                                     filename)
173
174if __name__ == '__main__':
175    main()
176