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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 ]+<([^>\n]+)>')
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            try:
62                searchdirs.insert(0, os.path.join('/usr/include',
63                                                  os.environ['MULTIARCH']))
64            except KeyError:
65                pass
66
67
68def main():
69    global filedict
70    opts, args = getopt.getopt(sys.argv[1:], 'i:')
71    for o, a in opts:
72        if o == '-i':
73            ignores.append(re.compile(a))
74    if not args:
75        args = ['-']
76    for filename in args:
77        if filename == '-':
78            sys.stdout.write('# Generated by h2py from stdin\n')
79            process(sys.stdin, sys.stdout)
80        else:
81            fp = open(filename, 'r')
82            outfile = os.path.basename(filename)
83            i = outfile.rfind('.')
84            if i > 0: outfile = outfile[:i]
85            modname = outfile.upper()
86            outfile = modname + '.py'
87            outfp = open(outfile, 'w')
88            outfp.write('# Generated by h2py from %s\n' % filename)
89            filedict = {}
90            for dir in searchdirs:
91                if filename[:len(dir)] == dir:
92                    filedict[filename[len(dir)+1:]] = None  # no '/' trailing
93                    importable[filename[len(dir)+1:]] = modname
94                    break
95            process(fp, outfp)
96            outfp.close()
97            fp.close()
98
99def pytify(body):
100    # replace ignored patterns by spaces
101    for p in ignores:
102        body = p.sub(' ', body)
103    # replace char literals by ord(...)
104    body = p_char.sub("ord('\\1')", body)
105    # Compute negative hexadecimal constants
106    start = 0
107    UMAX = 2*(sys.maxint+1)
108    while 1:
109        m = p_hex.search(body, start)
110        if not m: break
111        s,e = m.span()
112        val = long(body[slice(*m.span(1))], 16)
113        if val > sys.maxint:
114            val -= UMAX
115            body = body[:s] + "(" + str(val) + ")" + body[e:]
116        start = s + 1
117    return body
118
119def process(fp, outfp, env = {}):
120    lineno = 0
121    while 1:
122        line = fp.readline()
123        if not line: break
124        lineno = lineno + 1
125        match = p_define.match(line)
126        if match:
127            # gobble up continuation lines
128            while line[-2:] == '\\\n':
129                nextline = fp.readline()
130                if not nextline: break
131                lineno = lineno + 1
132                line = line + nextline
133            name = match.group(1)
134            body = line[match.end():]
135            body = pytify(body)
136            ok = 0
137            stmt = '%s = %s\n' % (name, body.strip())
138            try:
139                exec stmt in env
140            except:
141                sys.stderr.write('Skipping: %s' % stmt)
142            else:
143                outfp.write(stmt)
144        match = p_macro.match(line)
145        if match:
146            macro, arg = match.group(1, 2)
147            body = line[match.end():]
148            body = pytify(body)
149            stmt = 'def %s(%s): return %s\n' % (macro, arg, body)
150            try:
151                exec stmt in env
152            except:
153                sys.stderr.write('Skipping: %s' % stmt)
154            else:
155                outfp.write(stmt)
156        match = p_include.match(line)
157        if match:
158            regs = match.regs
159            a, b = regs[1]
160            filename = line[a:b]
161            if importable.has_key(filename):
162                outfp.write('from %s import *\n' % importable[filename])
163            elif not filedict.has_key(filename):
164                filedict[filename] = None
165                inclfp = None
166                for dir in searchdirs:
167                    try:
168                        inclfp = open(dir + '/' + filename)
169                        break
170                    except IOError:
171                        pass
172                if inclfp:
173                    outfp.write(
174                            '\n# Included from %s\n' % filename)
175                    process(inclfp, outfp, env)
176                else:
177                    sys.stderr.write('Warning - could not find file %s\n' %
178                                     filename)
179
180if __name__ == '__main__':
181    main()
182