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gstreamer/bindings/python/codegen/h2def.py

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#!/usr/bin/env python
# -*- Mode: Python; py-indent-offset: 4 -*-
# GPL'ed
# Toby D. Reeves <toby@max.rl.plh.af.mil>
#
# Modified by James Henstridge <james@daa.com.au> to output stuff in
# Havoc's new defs format. Info on this format can be seen at:
# http://mail.gnome.org/archives/gtk-devel-list/2000-January/msg00070.html
# Updated to be PEP-8 compatible and refactored to use OOP
#
# Scan the given public .h files of a GTK module (or module using
# GTK object conventions) and generates a set of scheme defs.
#
# h2def searches through a header file looking for function prototypes and
# generates a scheme style defenition for each prototype.
# Basically the operation of h2def is:
#
# - read each .h file into a buffer which is scrubbed of extraneous data
# - find all object defenitions:
# - find all structures that may represent a GtkObject
# - find all structures that might represent a class
# - find all structures that may represent a GtkObject subclass
# - find all structures that might represent a class/Iface inherited from
# GTypeInterface
# - find all enum defenitions
# - write out the defs
#
# The command line options are:
#
# -s --separate Create separate files for objects and function/method defs
# using the given name as the base name (optional). If this
# is not specified the combined object and function defs
# will be output to sys.stdout.
# -f --defsfilter Extract defs from the given file to filter the output defs
# that is don't output defs that are defined in the
# defsfile. More than one deffile may be specified.
# -m --modulename The prefix to be stripped from the front of function names
# for the given module
# -n --namespace The module or namespace name to be used, for example
# WebKit where h2def is unable to detect the module name
# automatically. it also sets the gtype-id prefix.
# --onlyenums Only produce defs for enums and flags
# --onlyobjdefs Only produce defs for objects
# -v Verbose output
#
# Examples:
#
# python h2def.py /usr/local/include/pango-1.0/pango/*.h >/tmp/pango.defs
#
# - Outputs all defs for the pango module.
#
# python h2def.py -m gdk -s /tmp/gdk-2.10 \
# -f /usr/tmp/pygtk/gtk/gdk-base.defs \
# /usr/local/include/gtk-2.0/gdk/*.h \
# /usr/local/include/gtk-2.0/gdk-pixbuf/*.h
#
# - Outputs the gdk module defs that are not contained in the defs file
# /usr/tmp/pygtk/gtk/gdk-base.defs. Two output files are created:
# /tmp/gdk-2.10-types.defs and /tmp/gdk-2.10.defs.
#
# python h2def.py -n WebKit /usr/incude/webkit-1.0/webkit/*.h \
# >/tmp/webkit.defs
#
# - Outputs all the defs for webkit module, setting the module name to WebKit
# and the gtype-id prefix to WEBKIT_ which can't be detected automatically.
#
import getopt
import os
import re
import string
import sys
import defsparser
# ------------------ Create typecodes from typenames ---------
_upperstr_pat1 = re.compile(r'([^A-Z])([A-Z])')
_upperstr_pat2 = re.compile(r'([A-Z][A-Z])([A-Z][0-9a-z])')
_upperstr_pat3 = re.compile(r'^([A-Z])([A-Z])')
def to_upper_str(name):
"""Converts a typename to the equivalent upercase and underscores
name. This is used to form the type conversion macros and enum/flag
name variables"""
name = _upperstr_pat1.sub(r'\1_\2', name)
name = _upperstr_pat2.sub(r'\1_\2', name)
name = _upperstr_pat3.sub(r'\1_\2', name, count=1)
return string.upper(name)
def typecode(typename, namespace=None):
"""create a typecode (eg. GTK_TYPE_WIDGET) from a typename"""
if namespace:
return string.replace(string.upper(namespace) + "_" + to_upper_str(typename[len(namespace):]), '_', '_TYPE_', 1)
return string.replace(to_upper_str(typename), '_', '_TYPE_', 1)
# ------------------ Find object definitions -----------------
# Strips the comments from buffer
def strip_comments(buf):
parts = []
lastpos = 0
while 1:
pos = string.find(buf, '/*', lastpos)
if pos >= 0:
parts.append(buf[lastpos:pos])
pos = string.find(buf, '*/', pos)
if pos >= 0:
lastpos = pos + 2
else:
break
else:
parts.append(buf[lastpos:])
break
return string.join(parts, '')
# Strips the dll API from buffer, for example WEBKIT_API
def strip_dll_api(buf):
pat = re.compile("[A-Z]*_API ")
buf = pat.sub("", buf)
return buf
obj_name_pat = "[A-Z][a-z]*[A-Z][A-Za-z0-9]*"
split_prefix_pat = re.compile('([A-Z]+[a-z]*)([A-Za-z0-9]+)')
def find_obj_defs(buf, objdefs=[]):
"""
Try to find object definitions in header files.
"""
# filter out comments from buffer.
buf = strip_comments(buf)
# filter out dll api
buf = strip_dll_api(buf)
maybeobjdefs = [] # contains all possible objects from file
# first find all structures that look like they may represent a GtkObject
pat = re.compile("struct\s+_(" + obj_name_pat + ")\s*{\s*" +
"(" + obj_name_pat + ")\s+", re.MULTILINE)
pos = 0
while pos < len(buf):
m = pat.search(buf, pos)
if not m: break
maybeobjdefs.append((m.group(1), m.group(2)))
pos = m.end()
# handle typedef struct { ... } style struct defs.
pat = re.compile("typedef struct\s+[_\w]*\s*{\s*" +
"(" + obj_name_pat + ")\s+[^}]*}\s*" +
"(" + obj_name_pat + ")\s*;", re.MULTILINE)
pos = 0
while pos < len(buf):
m = pat.search(buf, pos)
if not m: break
maybeobjdefs.append((m.group(2), m.group(1)))
pos = m.end()
# now find all structures that look like they might represent a class:
pat = re.compile("struct\s+_(" + obj_name_pat + ")Class\s*{\s*" +
"(" + obj_name_pat + ")Class\s+", re.MULTILINE)
pos = 0
while pos < len(buf):
m = pat.search(buf, pos)
if not m: break
t = (m.group(1), m.group(2))
# if we find an object structure together with a corresponding
# class structure, then we have probably found a GtkObject subclass.
if t in maybeobjdefs:
objdefs.append(t)
pos = m.end()
pat = re.compile("typedef struct\s+[_\w]*\s*{\s*" +
"(" + obj_name_pat + ")Class\s+[^}]*}\s*" +
"(" + obj_name_pat + ")Class\s*;", re.MULTILINE)
pos = 0
while pos < len(buf):
m = pat.search(buf, pos)
if not m: break
t = (m.group(2), m.group(1))
# if we find an object structure together with a corresponding
# class structure, then we have probably found a GtkObject subclass.
if t in maybeobjdefs:
objdefs.append(t)
pos = m.end()
# now find all structures that look like they might represent
# a class inherited from GTypeInterface:
pat = re.compile("struct\s+_(" + obj_name_pat + ")Class\s*{\s*" +
"GTypeInterface\s+", re.MULTILINE)
pos = 0
while pos < len(buf):
m = pat.search(buf, pos)
if not m: break
t = (m.group(1), '')
t2 = (m.group(1)+'Class', 'GTypeInterface')
# if we find an object structure together with a corresponding
# class structure, then we have probably found a GtkObject subclass.
if t2 in maybeobjdefs:
objdefs.append(t)
pos = m.end()
# now find all structures that look like they might represent
# an Iface inherited from GTypeInterface:
pat = re.compile("struct\s+_(" + obj_name_pat + ")Iface\s*{\s*" +
"GTypeInterface\s+", re.MULTILINE)
pos = 0
while pos < len(buf):
m = pat.search(buf, pos)
if not m: break
t = (m.group(1), '')
t2 = (m.group(1)+'Iface', 'GTypeInterface')
# if we find an object structure together with a corresponding
# class structure, then we have probably found a GtkObject subclass.
if t2 in maybeobjdefs:
objdefs.append(t)
pos = m.end()
def sort_obj_defs(objdefs):
objdefs.sort() # not strictly needed, but looks nice
pos = 0
while pos < len(objdefs):
klass,parent = objdefs[pos]
for i in range(pos+1, len(objdefs)):
# parent below subclass ... reorder
if objdefs[i][0] == parent:
objdefs.insert(i+1, objdefs[pos])
del objdefs[pos]
break
else:
pos = pos + 1
return objdefs
# ------------------ Find enum definitions -----------------
def find_enum_defs(buf, enums=[]):
# strip comments
# bulk comments
buf = strip_comments(buf)
# strip dll api macros
buf = strip_dll_api(buf)
# strip # directives
pat = re.compile(r"""^[#].*?$""", re.MULTILINE)
buf = pat.sub('', buf)
buf = re.sub('\n', ' ', buf)
enum_pat = re.compile(r'enum\s*{([^}]*)}\s*([A-Z][A-Za-z]*)(\s|;)')
splitter = re.compile(r'\s*,\s', re.MULTILINE)
pos = 0
while pos < len(buf):
m = enum_pat.search(buf, pos)
if not m: break
name = m.group(2)
vals = m.group(1)
isflags = string.find(vals, '<<') >= 0
entries = []
for val in splitter.split(vals):
if not string.strip(val): continue
entries.append(string.split(val)[0])
if name != 'GdkCursorType':
enums.append((name, isflags, entries))
pos = m.end()
# ------------------ Find function definitions -----------------
def clean_func(buf):
"""
Ideally would make buf have a single prototype on each line.
Actually just cuts out a good deal of junk, but leaves lines
where a regex can figure prototypes out.
"""
# bulk comments
buf = strip_comments(buf)
# dll api
buf = strip_dll_api(buf)
# compact continued lines
pat = re.compile(r"""\\\n""", re.MULTILINE)
buf = pat.sub('', buf)
# Preprocess directives
pat = re.compile(r"""^[#].*?$""", re.MULTILINE)
buf = pat.sub('', buf)
#typedefs, stucts, and enums
pat = re.compile(r"""^(typedef|struct|enum)(\s|.|\n)*?;\s*""",
re.MULTILINE)
buf = pat.sub('', buf)
#strip DECLS macros
pat = re.compile(r"""G_BEGIN_DECLS|BEGIN_LIBGTOP_DECLS""", re.MULTILINE)
buf = pat.sub('', buf)
#extern "C"
pat = re.compile(r"""^\s*(extern)\s+\"C\"\s+{""", re.MULTILINE)
buf = pat.sub('', buf)
#multiple whitespace
pat = re.compile(r"""\s+""", re.MULTILINE)
buf = pat.sub(' ', buf)
#clean up line ends
pat = re.compile(r""";\s*""", re.MULTILINE)
buf = pat.sub('\n', buf)
buf = buf.lstrip()
#associate *, &, and [] with type instead of variable
#pat = re.compile(r'\s+([*|&]+)\s*(\w+)')
pat = re.compile(r' \s* ([*|&]+) \s* (\w+)', re.VERBOSE)
buf = pat.sub(r'\1 \2', buf)
pat = re.compile(r'\s+ (\w+) \[ \s* \]', re.VERBOSE)
buf = pat.sub(r'[] \1', buf)
# make return types that are const work.
buf = re.sub(r'\s*\*\s*G_CONST_RETURN\s*\*\s*', '** ', buf)
buf = string.replace(buf, 'G_CONST_RETURN ', 'const-')
buf = string.replace(buf, 'const ', 'const-')
#strip GSEAL macros from the middle of function declarations:
pat = re.compile(r"""GSEAL""", re.VERBOSE)
buf = pat.sub('', buf)
return buf
proto_pat=re.compile(r"""
(?P<ret>(-|\w|\&|\*)+\s*) # return type
\s+ # skip whitespace
(?P<func>\w+)\s*[(] # match the function name until the opening (
\s*(?P<args>.*?)\s*[)] # group the function arguments
""", re.IGNORECASE|re.VERBOSE)
#"""
arg_split_pat = re.compile("\s*,\s*")
get_type_pat = re.compile(r'(const-)?([A-Za-z0-9]+)\*?\s+')
pointer_pat = re.compile('.*\*$')
func_new_pat = re.compile('(\w+)_new$')
class DefsWriter:
def __init__(self, fp=None, prefix=None, ns=None, verbose=False,
defsfilter=None):
if not fp:
fp = sys.stdout
self.fp = fp
self.prefix = prefix
self.namespace = ns
self.verbose = verbose
self._enums = {}
self._objects = {}
self._functions = {}
if defsfilter:
filter = defsparser.DefsParser(defsfilter)
filter.startParsing()
for func in filter.functions + filter.methods.values():
self._functions[func.c_name] = func
for obj in filter.objects + filter.boxes + filter.interfaces:
self._objects[obj.c_name] = obj
for obj in filter.enums:
self._enums[obj.c_name] = obj
def write_def(self, deffile):
buf = open(deffile).read()
self.fp.write('\n;; From %s\n\n' % os.path.basename(deffile))
self._define_func(buf)
self.fp.write('\n')
def write_enum_defs(self, enums, fp=None):
if not fp:
fp = self.fp
fp.write(';; Enumerations and flags ...\n\n')
trans = string.maketrans(string.uppercase + '_',
string.lowercase + '-')
filter = self._enums
for cname, isflags, entries in enums:
if filter:
if cname in filter:
continue
name = cname
module = None
if self.namespace:
module = self.namespace
name = cname[len(self.namespace):]
else:
m = split_prefix_pat.match(cname)
if m:
module = m.group(1)
name = m.group(2)
if isflags:
fp.write('(define-flags ' + name + '\n')
else:
fp.write('(define-enum ' + name + '\n')
if module:
fp.write(' (in-module "' + module + '")\n')
fp.write(' (c-name "' + cname + '")\n')
fp.write(' (gtype-id "' + typecode(cname, self.namespace) + '")\n')
prefix = entries[0]
for ent in entries:
# shorten prefix til we get a match ...
# and handle GDK_FONT_FONT, GDK_FONT_FONTSET case
while ((len(prefix) and prefix[-1] != '_') or ent[:len(prefix)] != prefix
or len(prefix) >= len(ent)):
prefix = prefix[:-1]
prefix_len = len(prefix)
fp.write(' (values\n')
for ent in entries:
fp.write(' \'("%s" "%s")\n' %
(string.translate(ent[prefix_len:], trans), ent))
fp.write(' )\n')
fp.write(')\n\n')
def write_obj_defs(self, objdefs, fp=None):
if not fp:
fp = self.fp
fp.write(';; -*- scheme -*-\n')
fp.write('; object definitions ...\n')
filter = self._objects
for klass, parent in objdefs:
if filter:
if klass in filter:
continue
if self.namespace:
cname = klass[len(self.namespace):]
cmodule = self.namespace
else:
m = split_prefix_pat.match(klass)
cname = klass
cmodule = None
if m:
cmodule = m.group(1)
cname = m.group(2)
fp.write('(define-object ' + cname + '\n')
if cmodule:
fp.write(' (in-module "' + cmodule + '")\n')
if parent:
fp.write(' (parent "' + parent + '")\n')
fp.write(' (c-name "' + klass + '")\n')
fp.write(' (gtype-id "' + typecode(klass, self.namespace) + '")\n')
# should do something about accessible fields
fp.write(')\n\n')
def _define_func(self, buf):
buf = clean_func(buf)
buf = string.split(buf,'\n')
filter = self._functions
for p in buf:
if not p:
continue
m = proto_pat.match(p)
if m == None:
if self.verbose:
sys.stderr.write('No match:|%s|\n' % p)
continue
func = m.group('func')
if func[0] == '_':
continue
if filter:
if func in filter:
continue
ret = m.group('ret')
args = m.group('args')
args = arg_split_pat.split(args)
for i in range(len(args)):
spaces = string.count(args[i], ' ')
if spaces > 1:
args[i] = string.replace(args[i], ' ', '-', spaces - 1)
self._write_func(func, ret, args)
def _write_func(self, name, ret, args):
if len(args) >= 1:
# methods must have at least one argument
munged_name = name.replace('_', '')
m = get_type_pat.match(args[0])
if m:
obj = m.group(2)
if munged_name[:len(obj)] == obj.lower():
self._write_method(obj, name, ret, args)
return
if self.prefix:
l = len(self.prefix)
if name[:l] == self.prefix and name[l] == '_':
fname = name[l+1:]
else:
fname = name
else:
fname = name
# it is either a constructor or normal function
self.fp.write('(define-function ' + fname + '\n')
self.fp.write(' (c-name "' + name + '")\n')
# Hmmm... Let's asume that a constructor function name
# ends with '_new' and it returns a pointer.
m = func_new_pat.match(name)
if pointer_pat.match(ret) and m:
cname = ''
names = m.group(1).split('_')
if self.namespace:
cname = self.namespace
names = names[1:]
for s in names:
cname += s.title()
if cname != '':
self.fp.write(' (is-constructor-of "' + cname + '")\n')
self._write_return(ret)
self._write_arguments(args)
def _write_method(self, obj, name, ret, args):
regex = string.join(map(lambda x: x+'_?', string.lower(obj)),'')
mname = re.sub(regex, '', name, 1)
if self.prefix:
l = len(self.prefix) + 1
if mname[:l] == self.prefix and mname[l+1] == '_':
mname = mname[l+1:]
self.fp.write('(define-method ' + mname + '\n')
self.fp.write(' (of-object "' + obj + '")\n')
self.fp.write(' (c-name "' + name + '")\n')
self._write_return(ret)
self._write_arguments(args[1:])
def _write_return(self, ret):
if ret != 'void':
self.fp.write(' (return-type "' + ret + '")\n')
else:
self.fp.write(' (return-type "none")\n')
def _write_arguments(self, args):
is_varargs = 0
has_args = len(args) > 0
for arg in args:
if arg == '...':
is_varargs = 1
elif arg in ('void', 'void '):
has_args = 0
if has_args:
self.fp.write(' (parameters\n')
for arg in args:
if arg != '...':
tupleArg = tuple(string.split(arg))
if len(tupleArg) == 2:
self.fp.write(' \'("%s" "%s")\n' % tupleArg)
self.fp.write(' )\n')
if is_varargs:
self.fp.write(' (varargs #t)\n')
self.fp.write(')\n\n')
# ------------------ Main function -----------------
def main(args):
verbose = False
onlyenums = False
onlyobjdefs = False
separate = False
modulename = None
namespace = None
defsfilter = None
opts, args = getopt.getopt(args[1:], 'vs:m:n:f:',
['onlyenums', 'onlyobjdefs',
'modulename=', 'namespace=',
'separate=', 'defsfilter='])
for o, v in opts:
if o == '-v':
verbose = True
if o == '--onlyenums':
onlyenums = True
if o == '--onlyobjdefs':
onlyobjdefs = True
if o in ('-s', '--separate'):
separate = v
if o in ('-m', '--modulename'):
modulename = v
if o in ('-n', '--namespace'):
namespace = v
if o in ('-f', '--defsfilter'):
defsfilter = v
if not args[0:1]:
print 'Must specify at least one input file name'
return -1
# read all the object definitions in
objdefs = []
enums = []
for filename in args:
buf = open(filename).read()
find_obj_defs(buf, objdefs)
find_enum_defs(buf, enums)
objdefs = sort_obj_defs(objdefs)
if separate:
methods = file(separate + '.defs', 'w')
types = file(separate + '-types.defs', 'w')
dw = DefsWriter(methods, prefix=modulename, ns=namespace,
verbose=verbose, defsfilter=defsfilter)
dw.write_obj_defs(objdefs, types)
dw.write_enum_defs(enums, types)
print "Wrote %s-types.defs" % separate
for filename in args:
dw.write_def(filename)
print "Wrote %s.defs" % separate
else:
dw = DefsWriter(prefix=modulename, ns=namespace,
verbose=verbose, defsfilter=defsfilter)
if onlyenums:
dw.write_enum_defs(enums)
elif onlyobjdefs:
dw.write_obj_defs(objdefs)
else:
dw.write_obj_defs(objdefs)
dw.write_enum_defs(enums)
for filename in args:
dw.write_def(filename)
if __name__ == '__main__':
sys.exit(main(sys.argv))
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