#!/usr/bin/env python2

import getopt
import keyword
import os
import string
import sys

import argtypes
import definitions
import defsparser
import override
import reversewrapper
import warnings

class Coverage(object):
    def __init__(self, name):
        self.name = name
        self.wrapped = 0
        self.not_wrapped = 0

    def declare_wrapped(self):
        self.wrapped += 1

    def declare_not_wrapped(self):
        self.not_wrapped += 1

    def printstats(self):
        total = self.wrapped + self.not_wrapped
        fd = sys.stderr
        if total:
            fd.write("***INFO*** The coverage of %s is %.2f%% (%i/%i)\n" %
                     (self.name,
                      float(self.wrapped*100)/total,
                      self.wrapped,
                      total))
        else:
            fd.write("***INFO*** There are no declared %s.\n" % self.name)

functions_coverage = Coverage("global functions")
methods_coverage = Coverage("methods")
vproxies_coverage = Coverage("virtual proxies")
vaccessors_coverage = Coverage("virtual accessors")
iproxies_coverage = Coverage("interface proxies")

def exc_info():
    warnings.warn("deprecated", DeprecationWarning, stacklevel=2)
    #traceback.print_exc()
    etype, value, tb = sys.exc_info()
    ret = ""
    try:
        sval = str(value)
        if etype == argtypes.ArgTypeError:
            ret = "No ArgType for %s" % (sval,)
        else:
            ret = sval
    finally:
        del etype, value, tb
    return ret

def fixname(name):
    if keyword.iskeyword(name):
        return name + '_'
    return name

class FileOutput:
    '''Simple wrapper for file object, that makes writing #line
    statements easier.''' # "
    def __init__(self, fp, filename=None):
        self.fp = fp
        self.lineno = 1
        if filename:
            self.filename = filename
        else:
            self.filename = self.fp.name
    # handle writing to the file, and keep track of the line number ...
    def write(self, str):
        self.fp.write(str)
        self.lineno = self.lineno + string.count(str, '\n')
    def writelines(self, sequence):
        for line in sequence:
            self.write(line)
    def close(self):
        self.fp.close()
    def flush(self):
        self.fp.flush()

    def setline(self, linenum, filename):
        '''writes out a #line statement, for use by the C
        preprocessor.''' # "
        self.write('#line %d "%s"\n' % (linenum, filename))
    def resetline(self):
        '''resets line numbering to the original file'''
        self.setline(self.lineno + 1, self.filename)

class Wrapper:
    type_tmpl = (
        'PyTypeObject G_GNUC_INTERNAL Py%(typename)s_Type = {\n'
        '    PyObject_HEAD_INIT(NULL)\n'
        '    0,                                 /* ob_size */\n'
        '    "%(classname)s",                   /* tp_name */\n'
        '    sizeof(%(tp_basicsize)s),          /* tp_basicsize */\n'
        '    0,                                 /* tp_itemsize */\n'
        '    /* methods */\n'
        '    (destructor)%(tp_dealloc)s,        /* tp_dealloc */\n'
        '    (printfunc)0,                      /* tp_print */\n'
        '    (getattrfunc)%(tp_getattr)s,       /* tp_getattr */\n'
        '    (setattrfunc)%(tp_setattr)s,       /* tp_setattr */\n'
        '    (cmpfunc)%(tp_compare)s,           /* tp_compare */\n'
        '    (reprfunc)%(tp_repr)s,             /* tp_repr */\n'
        '    (PyNumberMethods*)%(tp_as_number)s,     /* tp_as_number */\n'
        '    (PySequenceMethods*)%(tp_as_sequence)s, /* tp_as_sequence */\n'
        '    (PyMappingMethods*)%(tp_as_mapping)s,   /* tp_as_mapping */\n'
        '    (hashfunc)%(tp_hash)s,             /* tp_hash */\n'
        '    (ternaryfunc)%(tp_call)s,          /* tp_call */\n'
        '    (reprfunc)%(tp_str)s,              /* tp_str */\n'
        '    (getattrofunc)%(tp_getattro)s,     /* tp_getattro */\n'
        '    (setattrofunc)%(tp_setattro)s,     /* tp_setattro */\n'
        '    (PyBufferProcs*)%(tp_as_buffer)s,  /* tp_as_buffer */\n'
        '    %(tp_flags)s,                      /* tp_flags */\n'
        '    %(tp_doc)s,                        /* Documentation string */\n'
        '    (traverseproc)%(tp_traverse)s,     /* tp_traverse */\n'
        '    (inquiry)%(tp_clear)s,             /* tp_clear */\n'
        '    (richcmpfunc)%(tp_richcompare)s,   /* tp_richcompare */\n'
        '    %(tp_weaklistoffset)s,             /* tp_weaklistoffset */\n'
        '    (getiterfunc)%(tp_iter)s,          /* tp_iter */\n'
        '    (iternextfunc)%(tp_iternext)s,     /* tp_iternext */\n'
        '    (struct PyMethodDef*)%(tp_methods)s, /* tp_methods */\n'
        '    (struct PyMemberDef*)0,              /* tp_members */\n'
        '    (struct PyGetSetDef*)%(tp_getset)s,  /* tp_getset */\n'
        '    NULL,                              /* tp_base */\n'
        '    NULL,                              /* tp_dict */\n'
        '    (descrgetfunc)%(tp_descr_get)s,    /* tp_descr_get */\n'
        '    (descrsetfunc)%(tp_descr_set)s,    /* tp_descr_set */\n'
        '    %(tp_dictoffset)s,                 /* tp_dictoffset */\n'
        '    (initproc)%(tp_init)s,             /* tp_init */\n'
        '    (allocfunc)%(tp_alloc)s,           /* tp_alloc */\n'
        '    (newfunc)%(tp_new)s,               /* tp_new */\n'
        '    (freefunc)%(tp_free)s,             /* tp_free */\n'
        '    (inquiry)%(tp_is_gc)s              /* tp_is_gc */\n'
        '};\n\n'
        )

    slots_list = [
        'tp_getattr', 'tp_setattr', 'tp_getattro', 'tp_setattro',
        'tp_compare', 'tp_repr',
        'tp_as_number', 'tp_as_sequence', 'tp_as_mapping', 'tp_hash',
        'tp_call', 'tp_str', 'tp_as_buffer', 'tp_richcompare', 'tp_iter',
        'tp_iternext', 'tp_descr_get', 'tp_descr_set', 'tp_init',
        'tp_alloc', 'tp_new', 'tp_free', 'tp_is_gc',
        'tp_traverse', 'tp_clear', 'tp_dealloc', 'tp_flags', 'tp_doc'
        ]

    getter_tmpl = (
        'static PyObject *\n'
        '%(funcname)s(PyObject *self, void *closure)\n'
        '{\n'
        '%(varlist)s'
        '    ret = %(field)s;\n'
        '%(codeafter)s\n'
        '}\n\n'
        )

    parse_tmpl = (
        '    if (!PyArg_ParseTupleAndKeywords(args, kwargs,'
        '"%(typecodes)s:%(name)s"%(parselist)s))\n'
        '        return %(errorreturn)s;\n'
        )

    deprecated_tmpl = (
        '    if (PyErr_Warn(PyExc_DeprecationWarning, '
        '"%(deprecationmsg)s") < 0)\n'
        '        return %(errorreturn)s;\n'
        )

    methdef_tmpl = (
        '    { "%(name)s", (PyCFunction)%(cname)s, %(flags)s,\n'
        '      %(docstring)s },\n'
        )

    noconstructor = (
        'static int\n'
        'pygobject_no_constructor(PyObject *self, PyObject *args, '
        'PyObject *kwargs)\n'
        '{\n'
        '    gchar buf[512];\n'
        '\n'
        '    g_snprintf(buf, sizeof(buf), "%s is an abstract widget", '
        'self->ob_type->tp_name);\n'
        '    PyErr_SetString(PyExc_NotImplementedError, buf);\n'
        '    return -1;\n'
        '}\n\n'
        )

    function_tmpl = (
        'static PyObject *\n'
        '_wrap_%(cname)s(PyObject *self%(extraparams)s)\n'
        '{\n'
        '%(varlist)s'
        '%(parseargs)s'
        '%(codebefore)s'
        '    %(begin_allow_threads)s\n'
        '    %(setreturn)s%(cname)s(%(arglist)s);\n'
        '    %(end_allow_threads)s\n'
        '%(codeafter)s\n'
        '}\n\n'
        )

    virtual_accessor_tmpl = (
        'static PyObject *\n'
        '_wrap_%(cname)s(PyObject *cls%(extraparams)s)\n'
        '{\n'
        '    gpointer klass;\n'
        '%(varlist)s'
        '%(parseargs)s'
        '%(codebefore)s'
        '    klass = g_type_class_ref(pyg_type_from_object(cls));\n'
        '    if (%(class_cast_macro)s(klass)->%(virtual)s)\n'
        '        %(setreturn)s%(class_cast_macro)s(klass)->'
        '%(virtual)s(%(arglist)s);\n'
        '    else {\n'
        '        PyErr_SetString(PyExc_NotImplementedError, '
        '"virtual method %(name)s not implemented");\n'
        '        g_type_class_unref(klass);\n'
        '        return NULL;\n'
        '    }\n'
        '    g_type_class_unref(klass);\n'
        '%(codeafter)s\n'
        '}\n\n'
        )

    # template for method calls
    constructor_tmpl = None
    method_tmpl = None

    def __init__(self, parser, objinfo, overrides, fp=FileOutput(sys.stdout)):
        self.parser = parser
        self.objinfo = objinfo
        self.overrides = overrides
        self.fp = fp

    def get_lower_name(self):
        return string.lower(string.replace(self.objinfo.typecode,
                                           '_TYPE_', '_', 1))

    def get_field_accessor(self, fieldname):
        raise NotImplementedError

    def get_initial_class_substdict(self): return {}

    def get_initial_constructor_substdict(self, constructor):
        return { 'name': '%s.__init__' % self.objinfo.py_name,
                 'errorreturn': '-1' }

    def get_initial_method_substdict(self, method):
        substdict = { 'name': '%s.%s' % (self.objinfo.py_name, method.name) }
        if method.unblock_threads:
            substdict['begin_allow_threads'] = 'pyg_begin_allow_threads;'
            substdict['end_allow_threads'] = 'pyg_end_allow_threads;'
        else:
            substdict['begin_allow_threads'] = ''
            substdict['end_allow_threads'] = ''
        return substdict

    def write_class(self):
        if self.overrides.is_type_ignored(self.objinfo.c_name):
            return
        self.fp.write('\n/* ----------- %s ----------- */\n\n' %
                      self.objinfo.c_name)
        substdict = self.get_initial_class_substdict()
        if not substdict.has_key('tp_flags'):
            substdict['tp_flags'] = 'Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE'
        substdict['typename'] = self.objinfo.c_name
        if self.overrides.modulename:
            substdict['classname'] = '%s.%s' % (self.overrides.modulename,
                                           self.objinfo.name)
        else:
            substdict['classname'] = self.objinfo.name
        substdict['tp_doc'] = self.objinfo.docstring

        # Maybe this could be done in a nicer way, but I'll leave it as it is
        # for now: -- Johan
        if not self.overrides.slot_is_overriden('%s.tp_init' %
                                                self.objinfo.c_name):
            substdict['tp_init'] = self.write_constructor()
        substdict['tp_methods'] = self.write_methods()
        substdict['tp_getset'] = self.write_getsets()

        # handle slots ...
        for slot in self.slots_list:

            slotname = '%s.%s' % (self.objinfo.c_name, slot)
            slotfunc = '_wrap_%s_%s' % (self.get_lower_name(), slot)
            if slot[:6] == 'tp_as_':
                slotfunc = '&' + slotfunc
            if self.overrides.slot_is_overriden(slotname):
                data = self.overrides.slot_override(slotname)
                self.write_function(slotname, data)
                substdict[slot] = slotfunc
            else:
                if not substdict.has_key(slot):
                    substdict[slot] = '0'

        self.fp.write(self.type_tmpl % substdict)

        self.write_virtuals()

    def write_function_wrapper(self, function_obj, template,
                               handle_return=0, is_method=0, kwargs_needed=0,
                               substdict=None):
        '''This function is the guts of all functions that generate
        wrappers for functions, methods and constructors.'''
        if not substdict: substdict = {}

        info = argtypes.WrapperInfo()

        substdict.setdefault('errorreturn', 'NULL')

        # for methods, we want the leading comma
        if is_method:
            info.arglist.append('')

        if function_obj.varargs:
            raise argtypes.ArgTypeNotFoundError("varargs functions not supported")

        for param in function_obj.params:
            if param.pdflt != None and '|' not in info.parsestr:
                info.add_parselist('|', [], [])
            handler = argtypes.matcher.get(param.ptype)
            handler.write_param(param.ptype, param.pname, param.pdflt,
                                param.pnull, info)

        substdict['setreturn'] = ''
        if handle_return:
            if function_obj.ret not in ('none', None):
                substdict['setreturn'] = 'ret = '
            handler = argtypes.matcher.get(function_obj.ret)
            handler.write_return(function_obj.ret,
                                 function_obj.caller_owns_return, info)

        if function_obj.deprecated != None:
            deprecated = self.deprecated_tmpl % {
                'deprecationmsg': function_obj.deprecated,
                'errorreturn': substdict['errorreturn'] }
        else:
            deprecated = ''

        # if name isn't set, set it to function_obj.name
        substdict.setdefault('name', function_obj.name)

        if function_obj.unblock_threads:
            substdict['begin_allow_threads'] = 'pyg_begin_allow_threads;'
            substdict['end_allow_threads'] = 'pyg_end_allow_threads;'
        else:
            substdict['begin_allow_threads'] = ''
            substdict['end_allow_threads'] = ''

        if self.objinfo:
            substdict['typename'] = self.objinfo.c_name
        substdict.setdefault('cname',  function_obj.c_name)
        substdict['varlist'] = info.get_varlist()
        substdict['typecodes'] = info.parsestr
        substdict['parselist'] = info.get_parselist()
        substdict['arglist'] = info.get_arglist()
        substdict['codebefore'] = deprecated + (
            string.replace(info.get_codebefore(),
            'return NULL', 'return ' + substdict['errorreturn'])
            )
        substdict['codeafter'] = (
            string.replace(info.get_codeafter(),
                           'return NULL',
                           'return ' + substdict['errorreturn']))

        if info.parsestr or kwargs_needed:
            substdict['parseargs'] = self.parse_tmpl % substdict
            substdict['extraparams'] = ', PyObject *args, PyObject *kwargs'
            flags = 'METH_VARARGS|METH_KEYWORDS'

            # prepend the keyword list to the variable list
            substdict['varlist'] = info.get_kwlist() + substdict['varlist']
        else:
            substdict['parseargs'] = ''
            substdict['extraparams'] = ''
            flags = 'METH_NOARGS'

        return template % substdict, flags

    def write_constructor(self):
        initfunc = '0'
        constructor = self.parser.find_constructor(self.objinfo,self.overrides)
        if not constructor:
            return self.write_default_constructor()

        funcname = constructor.c_name
        try:
            if self.overrides.is_overriden(funcname):
                data = self.overrides.override(funcname)
                self.write_function(funcname, data)
                self.objinfo.has_new_constructor_api = (
                    self.objinfo.typecode in
                    self.overrides.newstyle_constructors)
            else:
                # ok, a hack to determine if we should use
                # new-style constructores :P
                property_based = getattr(self,
                                         'write_property_based_constructor',
                                         None)
                if property_based:
                    if (len(constructor.params) == 0 or
                        isinstance(constructor.params[0],
                                   definitions.Property)):
                        # write_property_based_constructor is only
                        # implemented in GObjectWrapper
                        return self.write_property_based_constructor(
                            constructor)
                    else:
                        sys.stderr.write(
                            "Warning: generating old-style constructor for:" +
                            constructor.c_name + '\n')

                # write constructor from template ...
                code = self.write_function_wrapper(constructor,
                    self.constructor_tmpl,
                    handle_return=0, is_method=0, kwargs_needed=1,
                    substdict=self.get_initial_constructor_substdict(
                    constructor))[0]
                self.fp.write(code)
            initfunc = '_wrap_' + funcname
        except argtypes.ArgTypeError, ex:
            sys.stderr.write('Could not write constructor for %s: %s\n'
                             % (self.objinfo.c_name, str(ex)))

            initfunc = self.write_noconstructor()
        return initfunc

    def write_noconstructor(self):
        # this is a hack ...
        if not hasattr(self.overrides, 'no_constructor_written'):
            self.fp.write(self.noconstructor)
            self.overrides.no_constructor_written = 1
        initfunc = 'pygobject_no_constructor'
        return initfunc

    def write_default_constructor(self):
        return self.write_noconstructor()

    def get_methflags(self, funcname):
        if self.overrides.wants_kwargs(funcname):
            flags = 'METH_VARARGS|METH_KEYWORDS'
        elif self.overrides.wants_noargs(funcname):
            flags = 'METH_NOARGS'
        elif self.overrides.wants_onearg(funcname):
            flags = 'METH_O'
        else:
            flags = 'METH_VARARGS'
        if self.overrides.is_staticmethod(funcname):
            flags += '|METH_STATIC'
        elif self.overrides.is_classmethod(funcname):
            flags += '|METH_CLASS'
        return flags

    def write_function(self, funcname, data):
        lineno, filename = self.overrides.getstartline(funcname)
        self.fp.setline(lineno, filename)
        self.fp.write(data)
        self.fp.resetline()
        self.fp.write('\n\n')

    def _get_class_virtual_substdict(self, meth, cname, parent):
        substdict = self.get_initial_method_substdict(meth)
        substdict['virtual'] = meth.name
        substdict['cname'] = cname
        substdict['class_cast_macro'] = parent.typecode.replace(
            '_TYPE_', '_', 1) + "_CLASS"
        substdict['typecode'] = self.objinfo.typecode
        substdict['cast'] = string.replace(parent.typecode, '_TYPE_', '_', 1)
        return substdict

    def write_methods(self):
        methods = []
        klass = self.objinfo.c_name
        # First, get methods from the defs files
        for meth in self.parser.find_methods(self.objinfo):
            method_name = meth.c_name
            if self.overrides.is_ignored(method_name):
                continue
            try:
                if self.overrides.is_overriden(method_name):
                    if not self.overrides.is_already_included(method_name):
                        data = self.overrides.override(method_name)
                        self.write_function(method_name, data)

                    methflags = self.get_methflags(method_name)
                else:
                    # write constructor from template ...
                    code, methflags = self.write_function_wrapper(meth,
                        self.method_tmpl, handle_return=1, is_method=1,
                        substdict=self.get_initial_method_substdict(meth))
                    self.fp.write(code)
                methods.append(self.methdef_tmpl %
                               { 'name':  fixname(meth.name),
                                 'cname': '_wrap_' + method_name,
                                 'flags': methflags,
                                 'docstring': meth.docstring })
                methods_coverage.declare_wrapped()
            except argtypes.ArgTypeError, ex:
                methods_coverage.declare_not_wrapped()
                sys.stderr.write('Could not write method %s.%s: %s\n'
                                % (klass, meth.name, str(ex)))

        # Now try to see if there are any defined in the override
        for method_name in self.overrides.get_defines_for(klass):
            c_name = override.class2cname(klass, method_name)
            if self.overrides.is_already_included(method_name):
                continue

            try:
                data = self.overrides.define(klass, method_name)
                self.write_function(method_name, data)
                methflags = self.get_methflags(method_name)

                methods.append(self.methdef_tmpl %
                               { 'name':  method_name,
                                 'cname': '_wrap_' + c_name,
                                 'flags': methflags,
                                 'docstring': 'NULL' })
                methods_coverage.declare_wrapped()
            except argtypes.ArgTypeError, ex:
                methods_coverage.declare_not_wrapped()
                sys.stderr.write('Could not write method %s.%s: %s\n'
                                % (klass, method_name, str(ex)))

        # Add GObject virtual method accessors, for chaining to parent
        # virtuals from subclasses
        methods += self.write_virtual_accessors()

        if methods:
            methoddefs = '_Py%s_methods' % self.objinfo.c_name
            # write the PyMethodDef structure
            methods.append('    { NULL, NULL, 0, NULL }\n')
            self.fp.write('static const PyMethodDef %s[] = {\n' % methoddefs)
            self.fp.write(string.join(methods, ''))
            self.fp.write('};\n\n')
        else:
            methoddefs = 'NULL'
        return methoddefs

    def write_virtual_accessors(self):
        klass = self.objinfo.c_name
        methods = []
        for meth in self.parser.find_virtuals(self.objinfo):
            method_name = self.objinfo.c_name + "__do_" + meth.name
            if self.overrides.is_ignored(method_name):
                continue
            try:
                if self.overrides.is_overriden(method_name):
                    if not self.overrides.is_already_included(method_name):
                        data = self.overrides.override(method_name)
                        self.write_function(method_name, data)
                    methflags = self.get_methflags(method_name)
                else:
                    # temporarily add a 'self' parameter as first argument
                    meth.params.insert(0, definitions.Parameter(
                        ptype=(self.objinfo.c_name + '*'),
                        pname='self', pdflt=None, pnull=None))
                    try:
                        # write method from template ...
                        code, methflags = self.write_function_wrapper(
                            meth, self.virtual_accessor_tmpl,
                            handle_return=True, is_method=False,
                            substdict=self._get_class_virtual_substdict(
                            meth, method_name, self.objinfo))
                        self.fp.write(code)
                    finally:
                        del meth.params[0]
                methods.append(self.methdef_tmpl %
                               { 'name':  "do_" + fixname(meth.name),
                                 'cname': '_wrap_' + method_name,
                                 'flags': methflags + '|METH_CLASS',
                                 'docstring': 'NULL'})
                vaccessors_coverage.declare_wrapped()
            except argtypes.ArgTypeError, ex:
                vaccessors_coverage.declare_not_wrapped()
                sys.stderr.write(
                    'Could not write virtual accessor method %s.%s: %s\n'
                    % (klass, meth.name, str(ex)))
        return methods

    def write_virtuals(self):
        '''
        Write _wrap_FooBar__proxy_do_zbr() reverse wrapers for
        GObject virtuals
        '''
        klass = self.objinfo.c_name
        virtuals = []
        for meth in self.parser.find_virtuals(self.objinfo):
            method_name = self.objinfo.c_name + "__proxy_do_" + meth.name
            if self.overrides.is_ignored(method_name):
                continue
            try:
                if self.overrides.is_overriden(method_name):
                    if not self.overrides.is_already_included(method_name):
                        data = self.overrides.override(method_name)
                        self.write_function(method_name, data)
                else:
                    # write virtual proxy ...
                    ret, props = argtypes.matcher.get_reverse_ret(meth.ret)
                    wrapper = reversewrapper.ReverseWrapper(
                        '_wrap_' + method_name, is_static=True)
                    wrapper.set_return_type(ret(wrapper, **props))
                    wrapper.add_parameter(reversewrapper.PyGObjectMethodParam(
                        wrapper, "self", method_name="do_" + meth.name,
                        c_type=(klass + ' *')))
                    for param in meth.params:
                        handler, props = argtypes.matcher.get_reverse(
                            param.ptype)
                        props["direction"] = param.pdir
                        props["nullok"] = param.pnull
                        wrapper.add_parameter(handler(wrapper,
                                                      param.pname, **props))
                    buf = reversewrapper.MemoryCodeSink()
                    wrapper.generate(buf)
                    self.fp.write(buf.flush())
                virtuals.append((fixname(meth.name), '_wrap_' + method_name))
                vproxies_coverage.declare_wrapped()
            except argtypes.ArgTypeError, ex:
                vproxies_coverage.declare_not_wrapped()
                virtuals.append((fixname(meth.name), None))
                sys.stderr.write('Could not write virtual proxy %s.%s: %s\n'
                                % (klass, meth.name, str(ex)))
        if virtuals:
            # Write a 'pygtk class init' function for this object,
            # except when the object type is explicitly ignored (like
            # GtkPlug and GtkSocket on win32).
            if self.overrides.is_ignored(self.objinfo.typecode):
                return
            class_cast_macro = self.objinfo.typecode.replace(
                '_TYPE_', '_', 1) + "_CLASS"
            cast_macro = self.objinfo.typecode.replace('_TYPE_', '_', 1)
            funcname = "__%s_class_init" % klass
            self.objinfo.class_init_func = funcname
            have_implemented_virtuals = not not [True
                                                 for name, cname in virtuals
                                                     if cname is not None]
            self.fp.write(
            ('\nstatic int\n'
             '%(funcname)s(gpointer gclass, PyTypeObject *pyclass)\n'
             '{\n') % vars())

            if have_implemented_virtuals:
                self.fp.write('    PyObject *o;\n')
                self.fp.write(
                    '    %(klass)sClass *klass = '
                    '%(class_cast_macro)s(gclass);\n'
                    '    PyObject *gsignals = '
                    'PyDict_GetItemString(pyclass->tp_dict, "__gsignals__");\n'
                    % vars())

            for name, cname in virtuals:
                do_name = 'do_' + name
                if cname is None:
                    self.fp.write('\n    /* overriding %(do_name)s '
                                  'is currently not supported */\n' % vars())
                else:
                    self.fp.write('''
    o = PyObject_GetAttrString((PyObject *) pyclass, "%(do_name)s");
    if (o == NULL)
        PyErr_Clear();
    else {
        if (!PyObject_TypeCheck(o, &PyCFunction_Type)
            && !(gsignals && PyDict_GetItemString(gsignals, "%(name)s")))
            klass->%(name)s = %(cname)s;
        Py_DECREF(o);
    }
''' % vars())
            self.fp.write('    return 0;\n}\n')

    def write_getsets(self):
        lower_name = self.get_lower_name()
        getsets_name = lower_name + '_getsets'
        getterprefix = '_wrap_' + lower_name + '__get_'
        setterprefix = '_wrap_' + lower_name + '__set_'

        # no overrides for the whole function.  If no fields,
        # don't write a func
        if not self.objinfo.fields:
            return '0'
        getsets = []
        for ftype, cfname in self.objinfo.fields:
            fname = cfname.replace('.', '_')
            gettername = '0'
            settername = '0'
            attrname = self.objinfo.c_name + '.' + fname
            if self.overrides.attr_is_overriden(attrname):
                code = self.overrides.attr_override(attrname)
                self.write_function(attrname, code)
                if string.find(code, getterprefix + fname) >= 0:
                    gettername = getterprefix + fname
                if string.find(code, setterprefix + fname) >= 0:
                    settername = setterprefix + fname
            if gettername == '0':
                try:
                    funcname = getterprefix + fname
                    info = argtypes.WrapperInfo()
                    handler = argtypes.matcher.get(ftype)
                    # for attributes, we don't own the "return value"
                    handler.write_return(ftype, 0, info)
                    self.fp.write(self.getter_tmpl %
                                  { 'funcname': funcname,
                                    'varlist': info.varlist,
                                    'field': self.get_field_accessor(cfname),
                                    'codeafter': info.get_codeafter() })
                    gettername = funcname
                except argtypes.ArgTypeError, ex:
                    sys.stderr.write(
                        "Could not write getter for %s.%s: %s\n"
                        % (self.objinfo.c_name, fname, str(ex)))
            if gettername != '0' or settername != '0':
                getsets.append('    { "%s", (getter)%s, (setter)%s },\n' %
                               (fixname(fname), gettername, settername))

        if not getsets:
            return '0'
        self.fp.write('static const PyGetSetDef %s[] = {\n' % getsets_name)
        for getset in getsets:
            self.fp.write(getset)
        self.fp.write('    { NULL, (getter)0, (setter)0 },\n')
        self.fp.write('};\n\n')

        return getsets_name

    def _write_get_symbol_names(self, writer, functions):
        self.fp.write("""static PyObject *
_wrap__get_symbol_names(PyObject *self)
{
    PyObject *pylist = PyList_New(0);

""")
        for obj, bases in writer.get_classes():
            self.fp.write('    PyList_Append(pylist, '
                          'PyString_FromString("%s"));\n' % (obj.name))

        for name, cname, flags, docstring in functions:
            self.fp.write('    PyList_Append(pylist, '
                          'PyString_FromString("%s"));\n' % (name))

        for enum in writer.get_enums():
            self.fp.write('    PyList_Append(pylist, '
                          'PyString_FromString("%s"));\n' % (enum.name))
            for nick, value in enum.values:
                name = value[len(self.overrides.modulename)+1:]
                self.fp.write('    PyList_Append(pylist, '
                              'PyString_FromString("%s"));\n' % (name))

        self.fp.write("    return pylist;\n}\n\n");

    def _write_get_symbol(self, writer, functions):
        self.fp.write("""static PyObject *
_wrap__get_symbol(PyObject *self, PyObject *args)
{
    PyObject *d;
    char *name;
    static PyObject *modulename = NULL;
    static PyObject *module = NULL;
    static char *strip_prefix = "%s";

    if (!PyArg_ParseTuple(args, "Os", &d, &name))
        return NULL;

    if (!modulename)
       modulename = PyString_FromString("%s");

    if (!module)
       module = PyDict_GetItemString(d, "__module__");

""" % (self.overrides.modulename.upper() + '_',
       self.overrides.modulename))

        first = True
        # Classes / GObjects
        for obj, bases in writer.get_classes():
            if first:
                self.fp.write('    if (!strcmp(name, "%s")) {\n' % obj.name)
                first = False
            else:
                self.fp.write('    } else if (!strcmp(name, "%s")) {\n' % obj.name)
            self.fp.write(
                '       return (PyObject*)pygobject_lookup_class(%s);\n' %
                obj.typecode)
        self.fp.write('    }\n')

        # Functions
        for name, cname, flags, docstring in functions:
            self.fp.write('    else if (!strcmp(name, "%s")) {\n' % name)
            self.fp.write('        static PyMethodDef ml = { '
                          '"%s", (PyCFunction)%s, %s, "%s"};\n' % (
                name, cname, flags, docstring))
            self.fp.write('        return PyCFunction_NewEx(&ml, NULL, modulename);\n')
            self.fp.write('    }\n')

        # Enums
        def write_enum(enum, returnobj=False):
            if returnobj:
                ret = 'return '
            else:
                ret = ''
            if enum.deftype == 'enum':
                self.fp.write(
                    '        %spyg_enum_add(module, "%s", strip_prefix, %s);\n'
                    % (ret, enum.name, enum.typecode))
            else:
                self.fp.write(
                    '    %spyg_flags_add(module, "%s", strip_prefix, %s);\n'
                    % (ret, enum.name, enum.typecode))

        strip_len = len(self.overrides.modulename)+1 # GTK_
        for enum in writer.get_enums():
            # XXX: Implement without typecodes
            self.fp.write('    else if (!strcmp(name, "%s")) {\n' % enum.name)
            write_enum(enum, returnobj=True)
            self.fp.write('    }\n')

            for nick, value in enum.values:
                value = value[strip_len:]
                self.fp.write('    else if (!strcmp(name, "%s")) {\n' % value)
                write_enum(enum)
                self.fp.write('        return PyObject_GetAttrString(module, "%s");\n' %
                              value)
                self.fp.write('    }\n')

        self.fp.write('    return Py_None;\n}\n\n');

    def _write_function_bodies(self):
        functions = []
        # First, get methods from the defs files
        for func in self.parser.find_functions():
            funcname = func.c_name
            if self.overrides.is_ignored(funcname):
                continue
            try:
                if self.overrides.is_overriden(funcname):
                    data = self.overrides.override(funcname)
                    self.write_function(funcname, data)

                    methflags = self.get_methflags(funcname)
                else:
                    # write constructor from template ...
                    code, methflags = self.write_function_wrapper(func,
                        self.function_tmpl, handle_return=1, is_method=0)
                    self.fp.write(code)
                functions.append((func.name, '_wrap_' + funcname,
                                  methflags, func.docstring))
                functions_coverage.declare_wrapped()
            except argtypes.ArgTypeError, ex:
                functions_coverage.declare_not_wrapped()
                sys.stderr.write('Could not write function %s: %s\n'
                                 % (func.name, str(ex)))

        # Now try to see if there are any defined in the override
        for funcname in self.overrides.get_functions():
            try:
                data = self.overrides.function(funcname)
                self.write_function(funcname, data)
                methflags = self.get_methflags(funcname)
                functions.append((funcname, '_wrap_' + funcname,
                                  methflags, 'NULL'))
                functions_coverage.declare_wrapped()
            except argtypes.ArgTypeError, ex:
                functions_coverage.declare_not_wrapped()
                sys.stderr.write('Could not write function %s: %s\n'
                                 % (funcname, str(ex)))
        return functions

    def write_functions(self, writer, prefix):
        self.fp.write('\n/* ----------- functions ----------- */\n\n')
        functions = []
        func_infos = self._write_function_bodies()

        # If we have a dynamic namespace, write symbol and attribute getter
        if self.overrides.dynamicnamespace:
            self._write_get_symbol_names(writer, func_infos)
            self._write_get_symbol(writer, func_infos)
            for obj, bases in writer.get_classes():
                self.fp.write("""static PyTypeObject *
%s_register_type(const gchar *name, PyObject *unused)
{
    PyObject *m = PyImport_ImportModule("gtk");
    PyObject *d = PyModule_GetDict(m);
""" % obj.c_name)
                writer.write_class(obj, bases, indent=1)
                self.fp.write(
                    '    return (%s)PyDict_GetItemString(d, "%s");\n' % (
                    'PyTypeObject*', obj.name))
                self.fp.write("}\n")

            functions.append('    { "_get_symbol_names", '
                             '(PyCFunction)_wrap__get_symbol_names, '
                             'METH_NOARGS, NULL },\n')
            functions.append('    { "_get_symbol", '
                             '(PyCFunction)_wrap__get_symbol, '
                             'METH_VARARGS, NULL },\n')
        else:
            for name, cname, flags, docstring in func_infos:
                functions.append(self.methdef_tmpl % dict(name=name,
                                                          cname=cname,
                                                          flags=flags,
                                                          docstring=docstring))

        # write the PyMethodDef structure
        functions.append('    { NULL, NULL, 0, NULL }\n')

        self.fp.write('const PyMethodDef ' + prefix + '_functions[] = {\n')
        self.fp.write(string.join(functions, ''))
        self.fp.write('};\n\n')

class GObjectWrapper(Wrapper):
    constructor_tmpl = (
        'static int\n'
        '_wrap_%(cname)s(PyGObject *self%(extraparams)s)\n'
        '{\n'
        '%(varlist)s'
        '%(parseargs)s'
        '%(codebefore)s'
        '    self->obj = (GObject *)%(cname)s(%(arglist)s);\n'
        '%(codeafter)s\n'
        '    if (!self->obj) {\n'
        '        PyErr_SetString(PyExc_RuntimeError, '
        '"could not create %(typename)s object");\n'
        '        return -1;\n'
        '    }\n'
        '%(aftercreate)s'
        '    pygobject_register_wrapper((PyObject *)self);\n'
        '    return 0;\n'
        '}\n\n'
        )

    method_tmpl = (
        'static PyObject *\n'
        '_wrap_%(cname)s(PyGObject *self%(extraparams)s)\n'
        '{\n'
        '%(varlist)s'
        '%(parseargs)s'
        '%(codebefore)s'
        '    %(begin_allow_threads)s\n'
        '    %(setreturn)s%(cname)s(%(cast)s(self->obj)%(arglist)s);\n'
        '    %(end_allow_threads)s\n'
        '%(codeafter)s\n'
        '}\n\n'
        )
    def __init__(self, parser, objinfo, overrides, fp=FileOutput(sys.stdout)):
        Wrapper.__init__(self, parser, objinfo, overrides, fp)
        if self.objinfo:
            self.castmacro = string.replace(self.objinfo.typecode,
                                            '_TYPE_', '_', 1)

    def get_initial_class_substdict(self):
        return { 'tp_basicsize'      : 'PyGObject',
                 'tp_weaklistoffset' : 'offsetof(PyGObject, weakreflist)',
                 'tp_dictoffset'     : 'offsetof(PyGObject, inst_dict)' }

    def get_field_accessor(self, fieldname):
        castmacro = string.replace(self.objinfo.typecode, '_TYPE_', '_', 1)
        return '%s(pygobject_get(self))->%s' % (castmacro, fieldname)

    def get_initial_constructor_substdict(self, constructor):
        substdict = Wrapper.get_initial_constructor_substdict(self,
                                                              constructor)
        if not constructor.caller_owns_return:
            substdict['aftercreate'] = "    g_object_ref(self->obj);\n"
        else:
            substdict['aftercreate'] = ''
        return substdict

    def get_initial_method_substdict(self, method):
        substdict = Wrapper.get_initial_method_substdict(self, method)
        substdict['cast'] = string.replace(self.objinfo.typecode,
                                           '_TYPE_', '_', 1)
        return substdict

    def write_default_constructor(self):
        try:
            parent = self.parser.find_object(self.objinfo.parent)
        except ValueError:
            parent = None
        if parent is not None:
            ## just like the constructor is inheritted, we should
            # inherit the new API compatibility flag
            self.objinfo.has_new_constructor_api = (
                parent.has_new_constructor_api)
        elif self.objinfo.parent == 'GObject':
            self.objinfo.has_new_constructor_api = True
        return '0'

    def write_property_based_constructor(self, constructor):
        self.objinfo.has_new_constructor_api = True
        out = self.fp
        print >> out, "static int"
        print >> out, '_wrap_%s(PyGObject *self, PyObject *args,' \
              ' PyObject *kwargs)\n{' % constructor.c_name
        if constructor.params:
            s = "    GType obj_type = pyg_type_from_object((PyObject *) self);"
            print >> out, s

        def py_str_list_to_c(arg):
            if arg:
                return "{" + ", ".join(
                    map(lambda s: '"' + s + '"', arg)) + ", NULL }"
            else:
                return "{ NULL }"

        classname = '%s.%s' % (self.overrides.modulename,
                               self.objinfo.name)

        if constructor.params:
            mandatory_arguments = [param for param in constructor.params
                                             if not param.optional]
            optional_arguments = [param for param in constructor.params
                                            if param.optional]
            arg_names = py_str_list_to_c(
            [param.argname
             for param in mandatory_arguments + optional_arguments])

            prop_names = py_str_list_to_c(
            [param.pname
             for param in mandatory_arguments + optional_arguments])

            print >> out, "    GParameter params[%i];" % \
                  len(constructor.params)
            print >> out, "    PyObject *parsed_args[%i] = {NULL, };" % \
                  len(constructor.params)
            print >> out, "    char *arg_names[] = %s;" % arg_names
            print >> out, "    char *prop_names[] = %s;" % prop_names
            print >> out, "    guint nparams, i;"
            print >> out
            if constructor.deprecated is not None:
                out.write(
                    '    if (PyErr_Warn(PyExc_DeprecationWarning, '
                    '"%s") < 0)\n' %
                    constructor.deprecated)
                print >> out, '        return -1;'
                print >> out
            out.write("    if (!PyArg_ParseTupleAndKeywords(args, kwargs, ")
            template = '"'
            if mandatory_arguments:
                template += "O"*len(mandatory_arguments)
            if optional_arguments:
                template += "|" + "O"*len(optional_arguments)
            template += ':%s.__init__"' % classname
            print >> out, template, ", arg_names",
            for i in range(len(constructor.params)):
                print >> out, ", &parsed_args[%i]" % i,

            out.write(
                "))\n"
                "        return -1;\n"
                "\n"
                "    memset(params, 0, sizeof(GParameter)*%i);\n"
                "    if (!pyg_parse_constructor_args(obj_type, arg_names,\n"
                "                                    prop_names, params, \n"
                "                                    &nparams, parsed_args))\n"
                "        return -1;\n"
                "    pygobject_constructv(self, nparams, params);\n"
                "    for (i = 0; i < nparams; ++i)\n"
                "        g_value_unset(&params[i].value);\n"
                % len(constructor.params))
        else:
            out.write(
                "    static char* kwlist[] = { NULL };\n"
                "\n")

            if constructor.deprecated is not None:
                out.write(
                    '    if (PyErr_Warn(PyExc_DeprecationWarning, "%s") < 0)\n'
                    '        return -1;\n'
                    '\n' % constructor.deprecated)

            out.write(
                '    if (!PyArg_ParseTupleAndKeywords(args, kwargs,\n'
                '                                     ":%s.__init__",\n'
                '                                     kwlist))\n'
                '        return -1;\n'
                '\n'
                '    pygobject_constructv(self, 0, NULL);\n' % classname)
        out.write(
            '    if (!self->obj) {\n'
            '        PyErr_SetString(\n'
            '            PyExc_RuntimeError, \n'
            '            "could not create %s object");\n'
            '        return -1;\n'
            '    }\n' % classname)

        if not constructor.caller_owns_return:
            print >> out, "    g_object_ref(self->obj);\n"

        out.write(
            '    return 0;\n'
            '}\n\n')

        return "_wrap_%s" % constructor.c_name


class GInterfaceWrapper(GObjectWrapper):
    virtual_accessor_tmpl = (
        'static PyObject *\n'
        '_wrap_%(cname)s(PyObject *cls%(extraparams)s)\n'
        '{\n'
        '    %(vtable)s *iface;\n'
        '%(varlist)s'
        '%(parseargs)s'
        '%(codebefore)s'
        '    iface = g_type_interface_peek('
        'g_type_class_peek(pyg_type_from_object(cls)), %(typecode)s);\n'
        '    if (iface->%(virtual)s)\n'
        '        %(setreturn)siface->%(virtual)s(%(arglist)s);\n'
        '    else {\n'
        '        PyErr_SetString(PyExc_NotImplementedError, '
        '"interface method %(name)s not implemented");\n'
        '        return NULL;\n'
        '    }\n'
        '%(codeafter)s\n'
        '}\n\n'
        )

    def get_initial_class_substdict(self):
        return { 'tp_basicsize'      : 'PyObject',
                 'tp_weaklistoffset' : '0',
                 'tp_dictoffset'     : '0'}

    def write_constructor(self):
        # interfaces have no constructors ...
        return '0'
    def write_getsets(self):
        # interfaces have no fields ...
        return '0'

    def _get_class_virtual_substdict(self, meth, cname, parent):
        substdict = self.get_initial_method_substdict(meth)
        substdict['virtual'] = meth.name
        substdict['cname'] = cname
        substdict['typecode'] = self.objinfo.typecode
        substdict['vtable'] = self.objinfo.vtable
        return substdict

    def write_virtuals(self):
        ## Now write reverse method wrappers, which let python code
        ## implement interface methods.
        # First, get methods from the defs files
        klass = self.objinfo.c_name
        proxies = []
        for meth in self.parser.find_virtuals(self.objinfo):
            method_name = self.objinfo.c_name + "__proxy_do_" + meth.name
            if self.overrides.is_ignored(method_name):
                continue
            try:
                if self.overrides.is_overriden(method_name):
                    if not self.overrides.is_already_included(method_name):
                        data = self.overrides.override(method_name)
                        self.write_function(method_name, data)
                else:
                    # write proxy ...
                    ret, props = argtypes.matcher.get_reverse_ret(meth.ret)
                    wrapper = reversewrapper.ReverseWrapper(
                        '_wrap_' + method_name, is_static=True)
                    wrapper.set_return_type(ret(wrapper, **props))
                    wrapper.add_parameter(reversewrapper.PyGObjectMethodParam(
                        wrapper, "self", method_name="do_" + meth.name,
                        c_type=(klass + ' *')))
                    for param in meth.params:
                        handler, props = argtypes.matcher.get_reverse(
                            param.ptype)
                        props["direction"] = param.pdir
                        props["nullok"] = param.pnull
                        wrapper.add_parameter(
                            handler(wrapper, param.pname, **props))
                    buf = reversewrapper.MemoryCodeSink()
                    wrapper.generate(buf)
                    self.fp.write(buf.flush())
                proxies.append((fixname(meth.name), '_wrap_' + method_name))
                iproxies_coverage.declare_wrapped()
            except argtypes.ArgTypeError, ex:
                iproxies_coverage.declare_not_wrapped()
                proxies.append((fixname(meth.name), None))
                sys.stderr.write('Could not write interface proxy %s.%s: %s\n'
                                % (klass, meth.name, str(ex)))

        if not proxies or not [cname for name, cname in proxies if cname]:
            return

        ## Write an interface init function for this object
        funcname = "__%s__interface_init" % klass
        vtable = self.objinfo.vtable
        self.fp.write(
            '\nstatic void\n'
            '%(funcname)s(%(vtable)s *iface, PyTypeObject *pytype)\n'
            '{\n'
            '    %(vtable)s *parent_iface = '
            'g_type_interface_peek_parent(iface);\n'
            '    PyObject *py_method;\n'
            '\n'
            % vars())

        for name, cname in proxies:
            do_name = 'do_' + name
            if cname is None:
                continue

            self.fp.write((
                '    py_method = pytype? PyObject_GetAttrString('
                '(PyObject *) pytype, "%(do_name)s") : NULL;\n'
                '    if (py_method && !PyObject_TypeCheck(py_method, '
                '&PyCFunction_Type)) {\n'
                '        iface->%(name)s = %(cname)s;\n'
                '    } else {\n'
                '        PyErr_Clear();\n'
                '        if (parent_iface) {\n'
                '            iface->%(name)s = parent_iface->%(name)s;\n'
                '        }\n'
                '    Py_XDECREF(py_method);\n'
                '    }\n'
                ) % vars())
        self.fp.write('}\n\n')
        interface_info = "__%s__iinfo" % klass
        self.fp.write('''
static const GInterfaceInfo %s = {
    (GInterfaceInitFunc) %s,
    NULL,
    NULL
};
''' % (interface_info, funcname))
        self.objinfo.interface_info = interface_info

class GBoxedWrapper(Wrapper):
    constructor_tmpl = (
        'static int\n'
        '_wrap_%(cname)s(PyGBoxed *self%(extraparams)s)\n'
        '{\n'
        '%(varlist)s'
        '%(parseargs)s'
        '%(codebefore)s'
        '    self->gtype = %(typecode)s;\n'
        '    self->free_on_dealloc = FALSE;\n'
        '    self->boxed = %(cname)s(%(arglist)s);\n'
        '%(codeafter)s\n'
        '    if (!self->boxed) {\n'
        '        PyErr_SetString(PyExc_RuntimeError, '
        '"could not create %(typename)s object");\n'
        '        return -1;\n'
        '    }\n'
        '    self->free_on_dealloc = TRUE;\n'
        '    return 0;\n'
        '}\n\n'
        )

    method_tmpl = (
        'static PyObject *\n'
        '_wrap_%(cname)s(PyObject *self%(extraparams)s)\n'
        '{\n'
        '%(varlist)s'
        '%(parseargs)s'
        '%(codebefore)s'
        '    %(begin_allow_threads)s\n'
        '    %(setreturn)s%(cname)s(pyg_boxed_get(self, '
        '%(typename)s)%(arglist)s);\n'
        '    %(end_allow_threads)s\n'
        '%(codeafter)s\n'
        '}\n\n'
        )

    def get_initial_class_substdict(self):
        return { 'tp_basicsize'      : 'PyGBoxed',
                 'tp_weaklistoffset' : '0',
                 'tp_dictoffset'     : '0' }

    def get_field_accessor(self, fieldname):
        return 'pyg_boxed_get(self, %s)->%s' % (self.objinfo.c_name, fieldname)

    def get_initial_constructor_substdict(self, constructor):
        substdict = Wrapper.get_initial_constructor_substdict(
            self, constructor)
        substdict['typecode'] = self.objinfo.typecode
        return substdict

class GPointerWrapper(GBoxedWrapper):
    constructor_tmpl = (
        'static int\n'
        '_wrap_%(cname)s(PyGPointer *self%(extraparams)s)\n'
        '{\n'
        '%(varlist)s'
        '%(parseargs)s'
        '%(codebefore)s'
        '    self->gtype = %(typecode)s;\n'
        '    self->pointer = %(cname)s(%(arglist)s);\n'
        '%(codeafter)s\n'
        '    if (!self->pointer) {\n'
        '        PyErr_SetString(PyExc_RuntimeError, '
        '"could not create %(typename)s object");\n'
        '        return -1;\n'
        '    }\n'
        '    return 0;\n'
        '}\n\n'
        )

    method_tmpl = (
        'static PyObject *\n'
        '_wrap_%(cname)s(PyObject *self%(extraparams)s)\n'
        '{\n'
        '%(varlist)s'
        '%(parseargs)s'
        '%(codebefore)s'
        '    %(setreturn)s%(cname)s(pyg_pointer_get(self, '
        '%(typename)s)%(arglist)s);\n'
        '%(codeafter)s\n'
        '}\n\n'
        )

    def get_initial_class_substdict(self):
        return { 'tp_basicsize'      : 'PyGPointer',
                 'tp_weaklistoffset' : '0',
                 'tp_dictoffset'     : '0' }

    def get_field_accessor(self, fieldname):
        return 'pyg_pointer_get(self, %s)->%s' % (self.objinfo.c_name,
                                                  fieldname)

    def get_initial_constructor_substdict(self, constructor):
        substdict = Wrapper.get_initial_constructor_substdict(
            self, constructor)
        substdict['typecode'] = self.objinfo.typecode
        return substdict

class SourceWriter:
    def __init__(self, parser, overrides, prefix, fp=FileOutput(sys.stdout)):
        self.parser = parser
        self.overrides = overrides
        self.prefix = prefix
        self.fp = fp

    def write(self, py_ssize_t_clean=False):
        argtypes.py_ssize_t_clean = py_ssize_t_clean

        self.write_headers(py_ssize_t_clean)
        self.write_imports()
        self.write_type_declarations()
        self.write_body()
        self.write_classes()

        wrapper = Wrapper(self.parser, None, self.overrides, self.fp)
        wrapper.write_functions(self, self.prefix)

        if not self.overrides.dynamicnamespace:
            self.write_enums()
        self.write_extension_init()
        self.write_registers()
        
        argtypes.py_ssize_t_clean = False

    def write_headers(self, py_ssize_t_clean):
        self.fp.write('/* -- THIS FILE IS GENERATED - DO NOT EDIT */')
        self.fp.write('/* -*- Mode: C; c-basic-offset: 4 -*- */\n\n')
        if py_ssize_t_clean:
            self.fp.write('#define PY_SSIZE_T_CLEAN\n')
        self.fp.write('#include <Python.h>\n\n\n')
        if py_ssize_t_clean:
            self.fp.write('''

#if PY_VERSION_HEX < 0x02050000
typedef int Py_ssize_t;
#define PY_SSIZE_T_MAX INT_MAX
#define PY_SSIZE_T_MIN INT_MIN
typedef inquiry lenfunc;
typedef intargfunc ssizeargfunc;
typedef intobjargproc ssizeobjargproc;
#endif

''')
        self.fp.write(self.overrides.get_headers())
        self.fp.resetline()
        self.fp.write('\n\n')

    def write_imports(self):
        self.fp.write('/* ---------- types from other modules ---------- */\n')
        for module, pyname, cname, importing_for in self.overrides.get_imports():
            if importing_for is None or is_registered_object(importing_for):
                self.fp.write('static PyTypeObject *_%s;\n' % cname)
                self.fp.write('#define %s (*_%s)\n' % (cname, cname))
        self.fp.write('\n\n')

    def write_type_declarations(self):
        #todo use 'static' if used only in one file
        self.fp.write('/* ---------- forward type declarations ---------- */\n')
        for obj in self.parser.boxes:
            if not self.overrides.is_type_ignored(obj.c_name):
                self.fp.write('PyTypeObject G_GNUC_INTERNAL Py' + obj.c_name + '_Type;\n')
        for obj in self.parser.objects:
            if not self.overrides.is_type_ignored(obj.c_name):
                self.fp.write('PyTypeObject G_GNUC_INTERNAL Py' + obj.c_name + '_Type;\n')
        for interface in self.parser.interfaces:
            if not self.overrides.is_type_ignored(interface.c_name):
                self.fp.write('PyTypeObject G_GNUC_INTERNAL Py' + interface.c_name + '_Type;\n')
        self.fp.write('\n')

    def write_body(self):
        self.fp.write(self.overrides.get_body())
        self.fp.resetline()
        self.fp.write('\n\n')

    def _sort_parent_children(self, objects):
        objects = list(objects)
        modified = True
        while modified:
            modified = False
            parent_index = None
            child_index = None
            for i, obj in enumerate(objects):
                if obj.parent == 'GObject':
                    continue
                if obj.parent not in [info.c_name for info in objects[:i]]:
                    for j, info in enumerate(objects[i+1:]):
                        if info.c_name == obj.parent:
                            parent_index = i + 1 + j
                            child_index = i
                            break
                    else:
                        continue
                    break
            if child_index is not None and parent_index is not None:
                if child_index != parent_index:
                    objects.insert(child_index, objects.pop(parent_index))
                    modified = True
        return objects

    def write_classes(self):
        ## Sort the objects, so that we generate code for the parent types
        ## before their children.
        objects = self._sort_parent_children(self.parser.objects)

        for klass, items in ((GBoxedWrapper, self.parser.boxes),
                             (GPointerWrapper, self.parser.pointers),
                             (GObjectWrapper, objects),
                             (GInterfaceWrapper, self.parser.interfaces)):
            for item in items:
                instance = klass(self.parser, item, self.overrides, self.fp)
                instance.write_class()
                self.fp.write('\n')

    def get_enums(self):
        enums = []
        for enum in self.parser.enums:
            if self.overrides.is_type_ignored(enum.c_name):
                continue
            enums.append(enum)
        return enums

    def write_enums(self):
        if not self.parser.enums:
            return

        self.fp.write('\n/* ----------- enums and flags ----------- */\n\n')
        self.fp.write(
            'void\n' + self.prefix +
            '_add_constants(PyObject *module, const gchar *strip_prefix)\n{\n')

        self.fp.write(
            '#ifdef VERSION\n'
            '    PyModule_AddStringConstant(module, "__version__", VERSION);\n'
            '#endif\n')

        for enum in self.get_enums():
            if enum.typecode is None:
                for nick, value in enum.values:
                    self.fp.write(
                        '    PyModule_AddIntConstant(module, '
                        '(char *) pyg_constant_strip_prefix("%s", strip_prefix), %s);\n'
                        % (value, value))
            else:
                if enum.deftype == 'enum':
                    self.fp.write('  pyg_enum_add(module, "%s", strip_prefix, %s);\n'
                                  % (enum.name, enum.typecode))
                else:
                    self.fp.write('  pyg_flags_add(module, "%s", strip_prefix, %s);\n'
                                  % (enum.name, enum.typecode))

        self.fp.write('\n')
        self.fp.write('  if (PyErr_Occurred())\n')
        self.fp.write('    PyErr_Print();\n')
        self.fp.write('}\n\n')

    def write_object_imports(self, retval=''):
        imports = self.overrides.get_imports()[:]
        if not imports:
            return

        bymod = {}
        for module, pyname, cname, importing_for in imports:
            if importing_for is None or is_registered_object(importing_for):
                bymod.setdefault(module, []).append((pyname, cname))
        self.fp.write('    PyObject *module;\n\n')
        for module in bymod:
            self.fp.write(
                '    if ((module = PyImport_ImportModule("%s")) != NULL) {\n'
                % module)
            #self.fp.write(
            #    '        PyObject *moddict = PyModule_GetDict(module);\n\n')
            for pyname, cname in bymod[module]:
                #self.fp.write(
                #    '        _%s = (PyTypeObject *)PyDict_GetItemString('
                #    'moddict, "%s");\n' % (cname, pyname))
                self.fp.write(
                    '        _%s = (PyTypeObject *)PyObject_GetAttrString('
                    'module, "%s");\n' % (cname, pyname))
                self.fp.write('        if (_%s == NULL) {\n' % cname)
                self.fp.write('            PyErr_SetString(PyExc_ImportError,\n')
                self.fp.write('                "cannot import name %s from %s");\n'
                         % (pyname, module))
                self.fp.write('            return %s;\n' % retval)
                self.fp.write('        }\n')
            self.fp.write('    } else {\n')
            self.fp.write('        PyErr_SetString(PyExc_ImportError,\n')
            self.fp.write('            "could not import %s");\n' % module)
            self.fp.write('        return %s;\n' % retval)
            self.fp.write('    }\n')
        self.fp.write('\n')

    def write_extension_init(self):
        self.fp.write('/* initialise stuff extension classes */\n')
        self.fp.write('void\n' + self.prefix + '_register_classes(PyObject *d)\n{\n')
        self.write_object_imports()
        self.fp.write(self.overrides.get_init() + '\n')
        self.fp.resetline()

    def get_classes(self):
        objects = self.parser.objects[:]
        pos = 0
        while pos < len(objects):
            parent = objects[pos].parent
            for i in range(pos+1, len(objects)):
                if objects[i].c_name == parent:
                    objects.insert(i+1, objects[pos])
                    del objects[pos]
                    break
            else:
                pos = pos + 1

        retval = []
        for obj in objects:
            if self.overrides.is_type_ignored(obj.c_name):
                continue
            bases = []
            if obj.parent != None:
                bases.append(obj.parent)
            bases = bases + obj.implements
            retval.append((obj, bases))

        return retval

    def write_registers(self):
        for boxed in self.parser.boxes:
            if not self.overrides.is_type_ignored(boxed.c_name):
                self.fp.write('    pyg_register_boxed(d, "' + boxed.name +
                              '", ' + boxed.typecode +
                              ', &Py' + boxed.c_name +
                          '_Type);\n')
        for pointer in self.parser.pointers:
            if not self.overrides.is_type_ignored(pointer.c_name):
                self.fp.write('    pyg_register_pointer(d, "' + pointer.name +
                              '", ' + pointer.typecode +
                              ', &Py' + pointer.c_name + '_Type);\n')
        for interface in self.parser.interfaces:
            if not self.overrides.is_type_ignored(interface.c_name):
                self.fp.write('    pyg_register_interface(d, "'
                              + interface.name + '", '+ interface.typecode
                              + ', &Py' + interface.c_name + '_Type);\n')
                if interface.interface_info is not None:
                    self.fp.write('    pyg_register_interface_info(%s, &%s);\n' %
                                  (interface.typecode, interface.interface_info))

        if not self.overrides.dynamicnamespace:
            for obj, bases in self.get_classes():
                self.write_class(obj, bases)
        else:
            for obj, bases in self.get_classes():
                self.fp.write(
                    '    pyg_type_register_custom_callback("%s", '
                    '(PyGTypeRegistrationFunction)%s_register_type, d);\n' %
                    (obj.c_name, obj.c_name))

        self.fp.write('}\n')

    def _can_direct_ref(self, base):
        if not self.overrides.dynamicnamespace:
            return True
        if base == 'GObject':
            return True
        obj = get_object_by_name(base)
        if obj.module.lower() != self.overrides.modulename:
            return True
        return False

    def write_class(self, obj, bases, indent=1):
        indent_str = ' ' * (indent * 4)
        if bases:
            bases_str = 'Py_BuildValue("(%s)"' % (len(bases) * 'O')

            for base in bases:
                if self._can_direct_ref(base):
                    bases_str += ', &Py%s_Type' % base
                else:
                    baseobj = get_object_by_name(base)
                    bases_str += ', PyObject_GetAttrString(m, "%s")' % baseobj.name
            bases_str += ')'
        else:
            bases_str = 'NULL'

        self.fp.write(
                '%(indent)spygobject_register_class(d, "%(c_name)s", %(typecode)s, &Py%(c_name)s_Type, %(bases)s);\n'
                % dict(indent=indent_str, c_name=obj.c_name, typecode=obj.typecode, bases=bases_str))

        if obj.has_new_constructor_api:
            self.fp.write(
                indent_str + 'pyg_set_object_has_new_constructor(%s);\n' %
                obj.typecode)
        else:
            print >> sys.stderr, (
                "Warning: Constructor for %s needs to be updated to new API\n"
                "         See http://live.gnome.org/PyGTK_2fWhatsNew28"
                "#update-constructors") % obj.c_name

        if obj.class_init_func is not None:
            self.fp.write(
                indent_str + 'pyg_register_class_init(%s, %s);\n' %
                (obj.typecode, obj.class_init_func))

_objects = {}

def is_registered_object(c_name):
    return c_name in _objects

def get_object_by_name(c_name):
    global _objects
    return _objects[c_name]

def register_types(parser):
    global _objects
    for boxed in parser.boxes:
        argtypes.matcher.register_boxed(boxed.c_name, boxed.typecode)
        _objects[boxed.c_name] = boxed
    for pointer in parser.pointers:
        argtypes.matcher.register_pointer(pointer.c_name, pointer.typecode)
    for obj in parser.objects:
        argtypes.matcher.register_object(obj.c_name, obj.parent, obj.typecode)
        _objects[obj.c_name] = obj
    for iface in parser.interfaces:
        argtypes.matcher.register_object(iface.c_name, None, iface.typecode)
        _objects[iface.c_name] = iface
    for enum in parser.enums:
        if enum.deftype == 'flags':
            argtypes.matcher.register_flag(enum.c_name, enum.typecode)
        else:
            argtypes.matcher.register_enum(enum.c_name, enum.typecode)

usage = 'usage: codegen.py [-o overridesfile] [-p prefix] defsfile'
def main(argv):
    o = override.Overrides()
    prefix = 'pygtk'
    outfilename = None
    errorfilename = None
    opts, args = getopt.getopt(argv[1:], "o:p:r:t:D:I:",
                        ["override=", "prefix=", "register=", "outfilename=",
                         "load-types=", "errorfilename=", "py_ssize_t-clean"])
    defines = {} # -Dkey[=val] options
    py_ssize_t_clean = False
    for opt, arg in opts:
        if opt in ('-o', '--override'):
            o = override.Overrides(arg)
        elif opt in ('-p', '--prefix'):
            prefix = arg
        elif opt in ('-r', '--register'):
            # Warning: user has to make sure all -D options appear before -r
            p = defsparser.DefsParser(arg, defines)
            p.startParsing()
            register_types(p)
            del p
        elif opt == '--outfilename':
            outfilename = arg
        elif opt == '--errorfilename':
            errorfilename = arg
        elif opt in ('-t', '--load-types'):
            globals = {}
            execfile(arg, globals)
        elif opt == '-D':
            nameval = arg.split('=')
            try:
                defines[nameval[0]] = nameval[1]
            except IndexError:
                defines[nameval[0]] = None
        elif opt == '-I':
            defsparser.include_path.insert(0, arg)
        elif opt == '--py_ssize_t-clean':
            py_ssize_t_clean = True
    if len(args) < 1:
        print >> sys.stderr, usage
        return 1
    if errorfilename:
        sys.stderr = open(errorfilename, "w")
    p = defsparser.DefsParser(args[0], defines)
    if not outfilename:
        outfilename = os.path.splitext(args[0])[0] + '.c'

    p.startParsing()

    register_types(p)
    sw = SourceWriter(p, o, prefix, FileOutput(sys.stdout, outfilename))
    sw.write(py_ssize_t_clean)

    functions_coverage.printstats()
    methods_coverage.printstats()
    vproxies_coverage.printstats()
    vaccessors_coverage.printstats()
    iproxies_coverage.printstats()

if __name__ == '__main__':
    sys.exit(main(sys.argv))
