giscanner/ast.py

   1 # -*- Mode: Python -*-
   2 # GObject-Introspection - a framework for introspecting GObject libraries
   3 # Copyright (C) 2008  Johan Dahlin
   4 # Copyright (C) 2008, 2009 Red Hat, Inc.
   5 #
   6 # This library is free software; you can redistribute it and/or
   7 # modify it under the terms of the GNU Lesser General Public
   8 # License as published by the Free Software Foundation; either
   9 # version 2 of the License, or (at your option) any later version.
  10 #
  11 # This library is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 # Lesser General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU Lesser General Public
  17 # License along with this library; if not, write to the
  18 # Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 # Boston, MA 02111-1307, USA.
  20 #
  21
  22 from .odict import odict
  23 from .utils import to_underscores
  24
  25 class Type(object):
  26     """A Type can be either:
  27 * A reference to a node (target_giname)
  28 * A reference to a "fundamental" type like 'utf8'
  29 * A "foreign" type - this can be any string."
  30 If none are specified, then it's in an "unresolved" state.  An
  31 unresolved type can have two data sources; a "ctype" which comes
  32 from a C type string, or a gtype_name (from g_type_name()).
  33 """ # '''
  34
  35     def __init__(self,
  36                  ctype=None,
  37                  gtype_name=None,
  38                  target_fundamental=None,
  39                  target_giname=None,
  40                  target_foreign=None,
  41                  _target_unknown=False,
  42                  is_const=False,
  43                  origin_symbol=None):
  44         self.ctype = ctype
  45         self.gtype_name = gtype_name
  46         self.origin_symbol = origin_symbol
  47         if _target_unknown:
  48             assert isinstance(self, TypeUnknown)
  49         elif target_fundamental:
  50             assert target_giname is None
  51             assert target_foreign is None
  52         elif target_giname:
  53             assert '.' in target_giname
  54             assert target_fundamental is None
  55             assert target_foreign is None
  56         elif target_foreign:
  57             assert ctype is not None
  58             assert target_giname is None
  59             assert target_fundamental is None
  60         else:
  61             assert (ctype is not None) or (gtype_name is not None)
  62         self.target_fundamental = target_fundamental
  63         self.target_giname = target_giname
  64         self.target_foreign = target_foreign
  65         self.is_const = is_const
  66
  67     @property
  68     def resolved(self):
  69         return (self.target_fundamental or
  70                 self.target_giname or
  71                 self.target_foreign)
  72
  73     @property
  74     def unresolved_string(self):
  75         if self.ctype:
  76             return self.ctype
  77         elif self.gtype_name:
  78             return self.gtype_name
  79         else:
  80             assert False
  81
  82     @classmethod
  83     def create_from_gtype_name(cls, gtype_name):
  84         """Parse a GType name (as from g_type_name()), and return a
  85 Type instance.  Note that this function performs namespace lookup,
  86 in contrast to the other create_type() functions."""
  87         # First, is it a fundamental?
  88         fundamental = type_names.get(gtype_name)
  89         if fundamental is not None:
  90             return cls(target_fundamental=fundamental.target_fundamental)
  91         return cls(gtype_name=gtype_name)
  92
  93     def get_giname(self):
  94         assert self.target_giname is not None
  95         return self.target_giname.split('.')[1]
  96
  97     def __cmp__(self, other):
  98         if self.target_fundamental:
  99             return cmp(self.target_fundamental, other.target_fundamental)
 100         if self.target_giname:
 101             return cmp(self.target_giname, other.target_giname)
 102         if self.target_foreign:
 103             return cmp(self.target_foreign, other.target_foreign)
 104         return cmp(self.ctype, other.ctype)
 105
 106     def is_equiv(self, typeval):
 107         """Return True if the specified types are compatible at
 108         an introspection level, disregarding their C types.
 109         A sequence may be given for typeval, in which case
 110         this function returns True if the type is compatible with
 111         any."""
 112         if isinstance(typeval, (list, tuple)):
 113             for val in typeval:
 114                 if self.is_equiv(val):
 115                     return True
 116             return False
 117         return self == typeval
 118
 119     def clone(self):
 120         return Type(target_fundamental=self.target_fundamental,
 121                     target_giname=self.target_giname,
 122                     target_foreign=self.target_foreign,
 123                     ctype=self.ctype,
 124                     is_const=self.is_const)
 125
 126     def __str__(self):
 127         if self.target_fundamental:
 128             return self.target_fundamental
 129         elif self.target_giname:
 130             return self.target_giname
 131         elif self.target_foreign:
 132             return self.target_foreign
 133
 134     def __repr__(self):
 135         if self.target_fundamental:
 136             data = 'target_fundamental=%s, ' % (self.target_fundamental, )
 137         elif self.target_giname:
 138             data = 'target_giname=%s, ' % (self.target_giname, )
 139         elif self.target_foreign:
 140             data = 'target_foreign=%s, ' % (self.target_foreign, )
 141         else:
 142             data = ''
 143         return '%s(%sctype=%s)' % (self.__class__.__name__, data, self.ctype)
 144
 145 class TypeUnknown(Type):
 146     def __init__(self):
 147         Type.__init__(self, _target_unknown=True)
 148
 149 ######
 150 ## Fundamental types
 151 ######
 152 # Two special ones
 153 TYPE_NONE = Type(target_fundamental='none', ctype='void')
 154 TYPE_ANY = Type(target_fundamental='gpointer', ctype='gpointer')
 155 # "Basic" types
 156 TYPE_BOOLEAN = Type(target_fundamental='gboolean', ctype='gboolean')
 157 TYPE_INT8 = Type(target_fundamental='gint8', ctype='gint8')
 158 TYPE_UINT8 = Type(target_fundamental='guint8', ctype='guint8')
 159 TYPE_INT16 = Type(target_fundamental='gint16', ctype='gint16')
 160 TYPE_UINT16 = Type(target_fundamental='guint16', ctype='guint16')
 161 TYPE_INT32 = Type(target_fundamental='gint32', ctype='gint32')
 162 TYPE_UINT32 = Type(target_fundamental='guint32', ctype='guint32')
 163 TYPE_INT64 = Type(target_fundamental='gint64', ctype='gint64')
 164 TYPE_UINT64 = Type(target_fundamental='guint64', ctype='guint64')
 165 TYPE_CHAR = Type(target_fundamental='gchar', ctype='gchar')
 166 TYPE_SHORT = Type(target_fundamental='gshort', ctype='gshort')
 167 TYPE_USHORT = Type(target_fundamental='gushort', ctype='gushort')
 168 TYPE_INT = Type(target_fundamental='gint', ctype='gint')
 169 TYPE_UINT = Type(target_fundamental='guint', ctype='guint')
 170 TYPE_LONG = Type(target_fundamental='glong', ctype='glong')
 171 TYPE_ULONG = Type(target_fundamental='gulong', ctype='gulong')
 172 # C99 types
 173 TYPE_LONG_LONG = Type(target_fundamental='long long', ctype='long long')
 174 TYPE_LONG_ULONG = Type(target_fundamental='unsigned long long',
 175                        ctype='unsigned long long')
 176 TYPE_FLOAT = Type(target_fundamental='gfloat', ctype='gfloat')
 177 TYPE_DOUBLE = Type(target_fundamental='gdouble', ctype='gdouble')
 178 # ?
 179 TYPE_LONG_DOUBLE = Type(target_fundamental='long double',
 180                         ctype='long double')
 181 TYPE_UNICHAR = Type(target_fundamental='gunichar', ctype='gunichar')
 182
 183 # C types with semantics overlaid
 184 TYPE_GTYPE = Type(target_fundamental='GType', ctype='GType')
 185 TYPE_STRING = Type(target_fundamental='utf8', ctype='gchar*')
 186 TYPE_FILENAME = Type(target_fundamental='filename', ctype='gchar*')
 187
 188 TYPE_VALIST = Type(target_fundamental='va_list', ctype='va_list')
 189
 190 BASIC_GIR_TYPES = [TYPE_BOOLEAN, TYPE_INT8, TYPE_UINT8, TYPE_INT16,
 191                    TYPE_UINT16, TYPE_INT32, TYPE_UINT32, TYPE_INT64,
 192                    TYPE_UINT64, TYPE_CHAR, TYPE_SHORT, TYPE_USHORT, TYPE_INT,
 193                    TYPE_UINT, TYPE_LONG, TYPE_ULONG, TYPE_LONG_LONG,
 194                    TYPE_LONG_ULONG, TYPE_FLOAT, TYPE_DOUBLE,
 195                    TYPE_LONG_DOUBLE, TYPE_UNICHAR, TYPE_GTYPE]
 196 GIR_TYPES = [TYPE_NONE, TYPE_ANY]
 197 GIR_TYPES.extend(BASIC_GIR_TYPES)
 198 GIR_TYPES.extend([TYPE_STRING, TYPE_FILENAME, TYPE_VALIST])
 199
 200 INTROSPECTABLE_BASIC = list(GIR_TYPES)
 201 for v in [TYPE_NONE, TYPE_ANY,
 202           TYPE_LONG_LONG, TYPE_LONG_ULONG,
 203           TYPE_LONG_DOUBLE, TYPE_VALIST]:
 204     INTROSPECTABLE_BASIC.remove(v)
 205
 206 type_names = {}
 207 for typeval in GIR_TYPES:
 208     type_names[typeval.target_fundamental] = typeval
 209 basic_type_names = {}
 210 for typeval in BASIC_GIR_TYPES:
 211     basic_type_names[typeval.target_fundamental] = typeval
 212
 213 # C builtin
 214 type_names['char'] = TYPE_CHAR
 215 type_names['signed char'] = TYPE_INT8
 216 type_names['unsigned char'] = TYPE_UINT8
 217 type_names['short'] = TYPE_SHORT
 218 type_names['signed short'] = TYPE_SHORT
 219 type_names['unsigned short'] = TYPE_USHORT
 220 type_names['int'] = TYPE_INT
 221 type_names['signed int'] = TYPE_INT
 222 type_names['unsigned short int'] = TYPE_USHORT
 223 type_names['signed'] = TYPE_INT
 224 type_names['unsigned int'] = TYPE_UINT
 225 type_names['unsigned'] = TYPE_UINT
 226 type_names['long'] = TYPE_LONG
 227 type_names['signed long'] = TYPE_LONG
 228 type_names['unsigned long'] = TYPE_ULONG
 229 type_names['unsigned long int'] = TYPE_ULONG
 230 type_names['float'] = TYPE_FLOAT
 231 type_names['double'] = TYPE_DOUBLE
 232 type_names['char*'] = TYPE_STRING
 233 type_names['void*'] = TYPE_ANY
 234 type_names['void'] = TYPE_NONE
 235 # Also alias the signed one here
 236 type_names['signed long long'] = TYPE_LONG_LONG
 237
 238 # A few additional GLib type aliases
 239 type_names['guchar'] = TYPE_UINT8
 240 type_names['gchararray'] = TYPE_STRING
 241 type_names['gchar*'] = TYPE_STRING
 242 type_names['goffset'] = TYPE_INT64
 243 type_names['gunichar2'] = TYPE_UINT16
 244 type_names['gsize'] = TYPE_ULONG
 245 type_names['gssize'] = TYPE_LONG
 246 type_names['gconstpointer'] = TYPE_ANY
 247
 248 # We used to support these; continue to do so
 249 type_names['any'] = TYPE_ANY
 250 type_names['boolean'] = TYPE_BOOLEAN
 251 type_names['uint'] = TYPE_UINT
 252 type_names['ulong'] = TYPE_ULONG
 253
 254 # C stdio, used in GLib public headers; squash this for now here
 255 # until we move scanning into GLib and can (skip)
 256 type_names['FILE*'] = TYPE_ANY
 257
 258 # One off C unix type definitions; note some of these may be GNU Libc
 259 # specific.  If someone is actually bitten by this, feel free to do
 260 # the required configure goop to determine their size and replace
 261 # here.
 262 #
 263 # We don't want to encourage people to use these in their APIs because
 264 # they compromise the platform-independence that GLib gives you.
 265 # These are here mostly to avoid blowing when random platform-specific
 266 # methods are added under #ifdefs inside GLib itself.  We could just (skip)
 267 # the relevant methods, but on the other hand, since these types are just
 268 # integers it's easy enough to expand them.
 269 type_names['size_t'] = type_names['gsize']
 270 type_names['time_t'] = TYPE_LONG
 271 type_names['off_t'] = type_names['gsize']
 272 type_names['pid_t'] = TYPE_INT
 273 type_names['uid_t'] = TYPE_UINT
 274 type_names['gid_t'] = TYPE_UINT
 275 type_names['dev_t'] = TYPE_INT
 276 type_names['socklen_t'] = TYPE_INT32
 277 type_names['size_t'] = TYPE_ULONG
 278 type_names['ssize_t'] = TYPE_LONG
 279
 280 # Obj-C
 281 type_names['id'] = TYPE_ANY
 282
 283 ##
 284 ## Parameters
 285 ##
 286
 287 PARAM_DIRECTION_IN = 'in'
 288 PARAM_DIRECTION_OUT = 'out'
 289 PARAM_DIRECTION_INOUT = 'inout'
 290
 291 PARAM_SCOPE_CALL = 'call'
 292 PARAM_SCOPE_ASYNC = 'async'
 293 PARAM_SCOPE_NOTIFIED = 'notified'
 294
 295 PARAM_TRANSFER_NONE = 'none'
 296 PARAM_TRANSFER_CONTAINER = 'container'
 297 PARAM_TRANSFER_FULL = 'full'
 298
 299 class Namespace(object):
 300     def __init__(self, name, version,
 301                  identifier_prefixes=None,
 302                  symbol_prefixes=None):
 303         self.name = name
 304         self.version = version
 305         if identifier_prefixes is not None:
 306             self.identifier_prefixes = identifier_prefixes
 307         else:
 308             self.identifier_prefixes = [name]
 309         if symbol_prefixes is not None:
 310             self.symbol_prefixes = symbol_prefixes
 311         else:
 312             ps = self.identifier_prefixes
 313             self.symbol_prefixes = [to_underscores(p).lower() for p in ps]
 314         # cache upper-cased versions
 315         self._ucase_symbol_prefixes = [p.upper() for p in self.symbol_prefixes]
 316         self._names = odict() # Maps from GIName -> node
 317         self._aliases = {} # Maps from GIName -> GIName
 318         self._type_names = {} # Maps from GTName -> node
 319         self._ctypes = {} # Maps from CType -> node
 320         self._symbols = {} # Maps from function symbols -> Function
 321
 322     @property
 323     def names(self):
 324         return self._names
 325
 326     @property
 327     def aliases(self):
 328         return self._aliases
 329
 330     @property
 331     def type_names(self):
 332         return self._type_names
 333
 334     @property
 335     def ctypes(self):
 336         return self._ctypes
 337
 338     def type_from_name(self, name, ctype=None):
 339         """Backwards compatibility method for older .gir files, which
 340 only use the 'name' attribute.  If name refers to a fundamental type,
 341 create a Type object referncing it.  If name is already a
 342 fully-qualified GIName like 'Foo.Bar', returns a Type targeting it .
 343 Otherwise a Type targeting name qualififed with the namespace name is
 344 returned."""
 345         if name in type_names:
 346             return Type(target_fundamental=name, ctype=ctype)
 347         if '.' in name:
 348             target = name
 349         else:
 350             target = '%s.%s' % (self.name, name)
 351         return Type(target_giname=target, ctype=ctype)
 352
 353     def append(self, node, replace=False):
 354         previous = self._names.get(node.name)
 355         if previous is not None:
 356             if not replace:
 357                 raise ValueError("Namespace conflict: %r" % (node, ))
 358             self.remove(previous)
 359         # A layering violation...but oh well.
 360         from .glibast import GLibBoxed
 361         if isinstance(node, Alias):
 362             self._aliases[node.name] = node
 363         elif isinstance(node, (GLibBoxed, Interface, Class)):
 364             self._type_names[node.type_name] = node
 365         elif isinstance(node, Function):
 366             self._symbols[node.symbol] = node
 367         assert isinstance(node, Node)
 368         assert node.namespace is None
 369         node.namespace = self
 370         self._names[node.name] = node
 371         if hasattr(node, 'ctype'):
 372             self._ctypes[node.ctype] = node
 373         if hasattr(node, 'symbol'):
 374             self._ctypes[node.symbol] = node
 375
 376     def remove(self, node):
 377         from .glibast import GLibBoxed
 378         if isinstance(node, Alias):
 379             del self._aliases[node.name]
 380         elif isinstance(node, (GLibBoxed, Interface, Class)):
 381             del self._type_names[node.type_name]
 382         del self._names[node.name]
 383         node.namespace = None
 384         if hasattr(node, 'ctype'):
 385             del self._ctypes[node.ctype]
 386         if isinstance(node, Function):
 387             del self._symbols[node.symbol]
 388
 389     def float(self, node):
 390         """Like remove(), but doesn't unset the node's namespace
 391 back-reference, and it's still possible to look up
 392 functions via get_by_symbol()."""
 393         if isinstance(node, Function):
 394             symbol = node.symbol
 395         self.remove(node)
 396         self._symbols[symbol] = node
 397         node.namespace = self
 398
 399     def __iter__(self):
 400         return iter(self._names)
 401
 402     def iteritems(self):
 403         return self._names.iteritems()
 404
 405     def itervalues(self):
 406         return self._names.itervalues()
 407
 408     def get(self, name):
 409         return self._names.get(name)
 410
 411     def get_by_ctype(self, ctype):
 412         return self._ctypes.get(ctype)
 413
 414     def get_by_symbol(self, symbol):
 415         return self._symbols.get(symbol)
 416
 417     def walk(self, callback):
 418         for node in self.itervalues():
 419             node.walk(callback, [])
 420
 421 class Include(object):
 422
 423     def __init__(self, name, version):
 424         self.name = name
 425         self.version = version
 426
 427     @classmethod
 428     def from_string(cls, string):
 429         return cls(*string.split('-', 1))
 430
 431     def __cmp__(self, other):
 432         namecmp = cmp(self.name, other.name)
 433         if namecmp != 0:
 434             return namecmp
 435         return cmp(self.version, other.version)
 436
 437     def __hash__(self):
 438         return hash(str(self))
 439
 440     def __str__(self):
 441         return '%s-%s' % (self.name, self.version)
 442
 443 class Annotated(object):
 444     """An object which has a few generic metadata
 445 properties."""
 446     def __init__(self):
 447         self.version = None
 448         self.skip = False
 449         self.introspectable = True
 450         self.attributes = [] # (key, value)*
 451         self.deprecated = None
 452         self.deprecated_version = None
 453         self.doc = None
 454
 455 class Node(Annotated):
 456     """A node is a type of object which is uniquely identified by its
 457 (namespace, name) pair.  When combined with a ., this is called a
 458 GIName.  It's possible for nodes to contain or point to other nodes."""
 459
 460     c_name = property(lambda self: self.namespace.name + self.name)
 461     gi_name = property(lambda self: '%s.%s' % (self.namespace.name, self.name))
 462
 463     def __init__(self, name=None):
 464         Annotated.__init__(self)
 465         self.namespace = None # Should be set later by Namespace.append()
 466         self.name = name
 467         self.foreign = False
 468         self.file_positions = set()
 469
 470     def create_type(self):
 471         """Create a Type object referencing this node."""
 472         assert self.namespace is not None
 473         return Type(target_giname=('%s.%s' % (self.namespace.name, self.name)))
 474
 475     def __cmp__(self, other):
 476         nscmp = cmp(self.namespace, other.namespace)
 477         if nscmp != 0:
 478             return nscmp
 479         return cmp(self.name, other.name)
 480
 481     def __repr__(self):
 482         return '%s(%r)' % (self.__class__.__name__, self.name)
 483
 484     def inherit_file_positions(self, node):
 485         self.file_positions.update(node.file_positions)
 486
 487     def add_file_position(self, filename, line, column):
 488         self.file_positions.add((filename, line, column))
 489
 490     def add_symbol_reference(self, symbol):
 491         if symbol.source_filename:
 492             self.add_file_position(symbol.source_filename, symbol.line, -1)
 493
 494     def walk(self, callback, chain):
 495         res = callback(self, chain)
 496         assert res in (True, False), "Walk function must return boolean, not %r" % (res, )
 497         if not res:
 498             return False
 499         chain.append(self)
 500         self._walk(callback, chain)
 501         chain.pop()
 502
 503     def _walk(self, callback, chain):
 504         pass
 505
 506 class Callable(Node):
 507
 508     def __init__(self, name, retval, parameters, throws):
 509         Node.__init__(self, name)
 510         self.retval = retval
 511         self.parameters = parameters
 512         self.throws = not not throws
 513
 514     def get_parameter_index(self, name):
 515         for i, parameter in enumerate(self.parameters):
 516             if parameter.argname == name:
 517                 return i
 518         raise ValueError("Unknown argument %s" % (name, ))
 519
 520     def get_parameter(self, name):
 521         for parameter in self.parameters:
 522             if parameter.argname == name:
 523                 return parameter
 524         raise ValueError("Unknown argument %s" % (name, ))
 525
 526
 527 class Function(Callable):
 528
 529     def __init__(self, name, retval, parameters, throws, symbol):
 530         Callable.__init__(self, name, retval, parameters, throws)
 531         self.symbol = symbol
 532         self.is_method = False
 533         self.is_constructor = False
 534         self.shadowed_by = None # C symbol string
 535         self.shadows = None # C symbol string
 536
 537
 538 class VFunction(Callable):
 539
 540     def __init__(self, name, retval, parameters, throws):
 541         Callable.__init__(self, name, retval, parameters, throws)
 542         self.invoker = None
 543
 544     @classmethod
 545     def from_callback(cls, cb):
 546         obj = cls(cb.name, cb.retval, cb.parameters[1:],
 547                   cb.throws)
 548         return obj
 549
 550
 551
 552 class Varargs(Type):
 553
 554     def __init__(self):
 555         Type.__init__(self, '<varargs>', target_fundamental='<varargs>')
 556
 557
 558 class Array(Type):
 559     C = '<c>'
 560     GLIB_ARRAY = 'GLib.Array'
 561     GLIB_BYTEARRAY = 'GLib.ByteArray'
 562     GLIB_PTRARRAY = 'GLib.PtrArray'
 563
 564     def __init__(self, array_type, element_type, **kwargs):
 565         Type.__init__(self, target_fundamental='<array>',
 566                       **kwargs)
 567         if (array_type is None or array_type == self.C):
 568             self.array_type = self.C
 569         else:
 570             assert array_type in (self.GLIB_ARRAY,
 571                                   self.GLIB_BYTEARRAY,
 572                                   self.GLIB_PTRARRAY)
 573             self.array_type = array_type
 574         assert isinstance(element_type, Type)
 575         self.element_type = element_type
 576         self.zeroterminated = True
 577         self.length_param_name = None
 578         self.size = None
 579
 580     def clone(self):
 581         arr = Array(self.array_type, self.element_type)
 582         arr.element_type = self.element_type
 583         arr.zeroterminated = self.zeroterminated
 584         arr.length_param_name = self.length_param_name
 585         arr.size = self.size
 586         return arr
 587
 588 class List(Type):
 589
 590     def __init__(self, name, element_type, **kwargs):
 591         Type.__init__(self, target_fundamental='<list>',
 592                       **kwargs)
 593         self.name = name
 594         assert isinstance(element_type, Type)
 595         self.element_type = element_type
 596
 597     def clone(self):
 598         l = List(self.name, self.element_type)
 599         l.element_type = self.element_type
 600         l.zeroterminated = self.zeroterminated
 601         l.length_param_name = self.length_param_name
 602         l.size = self.size
 603         return l
 604
 605 class Map(Type):
 606
 607     def __init__(self, key_type, value_type, **kwargs):
 608         Type.__init__(self, target_fundamental='<map>', **kwargs)
 609         assert isinstance(key_type, Type)
 610         self.key_type = key_type
 611         assert isinstance(value_type, Type)
 612         self.value_type = value_type
 613
 614     def clone(self):
 615         m = Map(self.key_type, self.value_type)
 616         return m
 617
 618 class Alias(Node):
 619
 620     def __init__(self, name, target, ctype=None):
 621         Node.__init__(self, name)
 622         self.target = target
 623         self.ctype = ctype
 624
 625
 626 class TypeContainer(Annotated):
 627     """A fundamental base class for Return and Parameter."""
 628
 629     def __init__(self, typenode, transfer):
 630         Annotated.__init__(self)
 631         self.type = typenode
 632         if transfer is not None:
 633             self.transfer = transfer
 634         elif typenode.is_const:
 635             self.transfer = PARAM_TRANSFER_NONE
 636         else:
 637             self.transfer = None
 638
 639
 640 class Parameter(TypeContainer):
 641     """An argument to a function."""
 642
 643     def __init__(self, argname, typenode, direction=None,
 644                  transfer=None, allow_none=False, scope=None,
 645                  caller_allocates=False):
 646         TypeContainer.__init__(self, typenode, transfer)
 647         self.argname = argname
 648         self.direction = direction
 649         self.allow_none = allow_none
 650         self.scope = scope
 651         self.caller_allocates = caller_allocates
 652         self.closure_name = None
 653         self.destroy_name = None
 654
 655
 656 class Return(TypeContainer):
 657     """A return value from a function."""
 658
 659     def __init__(self, rtype, transfer=None):
 660         TypeContainer.__init__(self, rtype, transfer)
 661         self.direction = PARAM_DIRECTION_OUT
 662
 663
 664 class Enum(Node):
 665
 666     def __init__(self, name, symbol, members):
 667         Node.__init__(self, name)
 668         self.symbol = symbol
 669         self.members = members
 670
 671
 672 class Bitfield(Node):
 673
 674     def __init__(self, name, symbol, members):
 675         Node.__init__(self, name)
 676         self.symbol = symbol
 677         self.members = members
 678
 679
 680 class Member(Annotated):
 681
 682     def __init__(self, name, value, symbol):
 683         Annotated.__init__(self)
 684         self.name = name
 685         self.value = value
 686         self.symbol = symbol
 687
 688     def __cmp__(self, other):
 689         return cmp(self.name, other.name)
 690
 691
 692 class Record(Node):
 693
 694     def __init__(self, name, symbol, disguised=False):
 695         Node.__init__(self, name)
 696         self.fields = []
 697         self.constructors = []
 698         self.symbol = symbol
 699         self.disguised = disguised
 700         self.methods = []
 701         self.static_methods = []
 702
 703     def _walk(self, callback, chain):
 704         for ctor in self.constructors:
 705             ctor.walk(callback, chain)
 706         for func in self.methods:
 707             func.walk(callback, chain)
 708         for func in self.static_methods:
 709             func.walk(callback, chain)
 710         for field in self.fields:
 711             if field.anonymous_node is not None:
 712                 field.anonymous_node.walk(callback, chain)
 713
 714
 715 class Field(Annotated):
 716
 717     def __init__(self, name, typenode, readable, writable, bits=None,
 718                  anonymous_node=None):
 719         Annotated.__init__(self)
 720         assert (typenode or anonymous_node)
 721         self.name = name
 722         self.type = typenode
 723         self.readable = readable
 724         self.writable = writable
 725         self.bits = bits
 726         self.anonymous_node = anonymous_node
 727
 728     def __cmp__(self, other):
 729         return cmp(self.name, other.name)
 730
 731
 732 class Class(Node):
 733
 734     def __init__(self, name, parent, is_abstract):
 735         Node.__init__(self, name)
 736         self.ctype = name
 737         self.c_symbol_prefix = None
 738         self.parent = parent
 739         # When we're in the scanner, we keep around a list
 740         # of parents so that we can transparently fall back
 741         # if there are 'hidden' parents
 742         self.parent_chain = []
 743         self.glib_type_struct = None
 744         self.is_abstract = is_abstract
 745         self.methods = []
 746         self.virtual_methods = []
 747         self.static_methods = []
 748         self.interfaces = []
 749         self.constructors = []
 750         self.properties = []
 751         self.fields = []
 752
 753     def _walk(self, callback, chain):
 754         for meth in self.methods:
 755             meth.walk(callback, chain)
 756         for meth in self.virtual_methods:
 757             meth.walk(callback, chain)
 758         for meth in self.static_methods:
 759             meth.walk(callback, chain)
 760         for ctor in self.constructors:
 761             ctor.walk(callback, chain)
 762         for field in self.fields:
 763             if field.anonymous_node:
 764                 field.anonymous_node.walk(callback, chain)
 765
 766 class Interface(Node):
 767
 768     def __init__(self, name, parent):
 769         Node.__init__(self, name)
 770         self.c_symbol_prefix = None
 771         self.parent = parent
 772         self.parent_chain = []
 773         self.methods = []
 774         self.static_methods = []
 775         self.virtual_methods = []
 776         self.glib_type_struct = None
 777         self.properties = []
 778         self.fields = []
 779         self.prerequisites = []
 780
 781     def _walk(self, callback, chain):
 782         for meth in self.methods:
 783             meth.walk(callback, chain)
 784         for meth in self.static_methods:
 785             meth.walk(callback, chain)
 786         for meth in self.virtual_methods:
 787             meth.walk(callback, chain)
 788         for field in self.fields:
 789             if field.anonymous_node:
 790                 field.anonymous_node.walk(callback, chain)
 791
 792 class Constant(Node):
 793
 794     def __init__(self, name, value_type, value):
 795         Node.__init__(self, name)
 796         self.value_type = value_type
 797         self.value = value
 798
 799
 800 class Property(Node):
 801
 802     def __init__(self, name, typeobj, readable, writable,
 803                  construct, construct_only, transfer=None):
 804         Node.__init__(self, name)
 805         self.type = typeobj
 806         self.readable = readable
 807         self.writable = writable
 808         self.construct = construct
 809         self.construct_only = construct_only
 810         self.transfer = PARAM_TRANSFER_NONE
 811
 812
 813 class Callback(Callable):
 814
 815     def __init__(self, name, retval, parameters, throws, ctype=None):
 816         Callable.__init__(self, name, retval, parameters, throws)
 817         self.ctype = ctype
 818
 819
 820 class Union(Node):
 821
 822     def __init__(self, name, symbol):
 823         Node.__init__(self, name)
 824         self.fields = []
 825         self.constructors = []
 826         self.methods = []
 827         self.static_methods = []
 828         self.symbol = symbol
 829
 830     def _walk(self, callback, chain):
 831         for ctor in self.constructors:
 832             ctor.walk(callback, chain)
 833         for meth in self.methods:
 834             meth.walk(callback, chain)
 835         for meth in self.static_methods:
 836             meth.walk(callback, chain)
 837         for field in self.fields:
 838             if field.anonymous_node:
 839                 field.anonymous_node.walk(callback, chain)