src/bindings/python/bt2/bt2/value.py

   1 # The MIT License (MIT)
   2 #
   3 # Copyright (c) 2017 Philippe Proulx <pproulx@efficios.com>
   4 #
   5 # Permission is hereby granted, free of charge, to any person obtaining a copy
   6 # of this software and associated documentation files (the "Software"), to deal
   7 # in the Software without restriction, including without limitation the rights
   8 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9 # copies of the Software, and to permit persons to whom the Software is
  10 # furnished to do so, subject to the following conditions:
  11 #
  12 # The above copyright notice and this permission notice shall be included in
  13 # all copies or substantial portions of the Software.
  14 #
  15 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  21 # THE SOFTWARE.
  22
  23 from bt2 import native_bt, object, utils
  24 import collections.abc
  25 import functools
  26 import numbers
  27 import math
  28 import abc
  29 import bt2
  30
  31
  32 def _handle_status(status, obj_name):
  33     if status >= 0:
  34         return
  35     else:
  36         raise RuntimeError('unexpected error')
  37
  38
  39 def _create_from_ptr(ptr):
  40     if ptr is None or ptr == native_bt.value_null:
  41         return
  42
  43     typeid = native_bt.value_get_type(ptr)
  44     return _TYPE_TO_OBJ[typeid]._create_from_ptr(ptr)
  45
  46
  47 def _create_from_ptr_and_get_ref(ptr):
  48     if ptr is None or ptr == native_bt.value_null:
  49         return
  50
  51     typeid = native_bt.value_get_type(ptr)
  52     return _TYPE_TO_OBJ[typeid]._create_from_ptr_and_get_ref(ptr)
  53
  54
  55 def create_value(value):
  56     if value is None:
  57         # null value object
  58         return
  59
  60     if isinstance(value, _Value):
  61         return value
  62
  63     if isinstance(value, bool):
  64         return BoolValue(value)
  65
  66     if isinstance(value, int):
  67         return SignedIntegerValue(value)
  68
  69     if isinstance(value, float):
  70         return RealValue(value)
  71
  72     if isinstance(value, str):
  73         return StringValue(value)
  74
  75     try:
  76         return MapValue(value)
  77     except:
  78         pass
  79
  80     try:
  81         return ArrayValue(value)
  82     except:
  83         pass
  84
  85     raise TypeError("cannot create value object from '{}' object".format(value.__class__.__name__))
  86
  87
  88 class _Value(object._SharedObject, metaclass=abc.ABCMeta):
  89     _get_ref = staticmethod(native_bt.value_get_ref)
  90     _put_ref = staticmethod(native_bt.value_put_ref)
  91
  92     def __ne__(self, other):
  93         return not (self == other)
  94
  95     def _handle_status(self, status):
  96         _handle_status(status, self._NAME)
  97
  98     def _check_create_status(self, ptr):
  99         if ptr is None:
 100             raise bt2.CreationError(
 101                 'cannot create {} value object'.format(self._NAME.lower()))
 102
 103
 104 @functools.total_ordering
 105 class _NumericValue(_Value):
 106     @staticmethod
 107     def _extract_value(other):
 108         if isinstance(other, BoolValue) or isinstance(other, bool):
 109             return bool(other)
 110
 111         if isinstance(other, numbers.Integral):
 112             return int(other)
 113
 114         if isinstance(other, numbers.Real):
 115             return float(other)
 116
 117         if isinstance(other, numbers.Complex):
 118             return complex(other)
 119
 120         raise TypeError("'{}' object is not a number object".format(other.__class__.__name__))
 121
 122     def __int__(self):
 123         return int(self._value)
 124
 125     def __float__(self):
 126         return float(self._value)
 127
 128     def __repr__(self):
 129         return repr(self._value)
 130
 131     def __lt__(self, other):
 132         return self._value < self._extract_value(other)
 133
 134     def __eq__(self, other):
 135         try:
 136             return self._value == self._extract_value(other)
 137         except:
 138             return False
 139
 140     def __rmod__(self, other):
 141         return self._extract_value(other) % self._value
 142
 143     def __mod__(self, other):
 144         return self._value % self._extract_value(other)
 145
 146     def __rfloordiv__(self, other):
 147         return self._extract_value(other) // self._value
 148
 149     def __floordiv__(self, other):
 150         return self._value // self._extract_value(other)
 151
 152     def __round__(self, ndigits=None):
 153         if ndigits is None:
 154             return round(self._value)
 155         else:
 156             return round(self._value, ndigits)
 157
 158     def __ceil__(self):
 159         return math.ceil(self._value)
 160
 161     def __floor__(self):
 162         return math.floor(self._value)
 163
 164     def __trunc__(self):
 165         return int(self._value)
 166
 167     def __abs__(self):
 168         return abs(self._value)
 169
 170     def __add__(self, other):
 171         return self._value + self._extract_value(other)
 172
 173     def __radd__(self, other):
 174         return self.__add__(other)
 175
 176     def __neg__(self):
 177         return -self._value
 178
 179     def __pos__(self):
 180         return +self._value
 181
 182     def __mul__(self, other):
 183         return self._value * self._extract_value(other)
 184
 185     def __rmul__(self, other):
 186         return self.__mul__(other)
 187
 188     def __truediv__(self, other):
 189         return self._value / self._extract_value(other)
 190
 191     def __rtruediv__(self, other):
 192         return self._extract_value(other) / self._value
 193
 194     def __pow__(self, exponent):
 195         return self._value ** self._extract_value(exponent)
 196
 197     def __rpow__(self, base):
 198         return self._extract_value(base) ** self._value
 199
 200     def __iadd__(self, other):
 201         self.value = self + other
 202         return self
 203
 204     def __isub__(self, other):
 205         self.value = self - other
 206         return self
 207
 208     def __imul__(self, other):
 209         self.value = self * other
 210         return self
 211
 212     def __itruediv__(self, other):
 213         self.value = self / other
 214         return self
 215
 216     def __ifloordiv__(self, other):
 217         self.value = self // other
 218         return self
 219
 220     def __imod__(self, other):
 221         self.value = self % other
 222         return self
 223
 224     def __ipow__(self, other):
 225         self.value = self ** other
 226         return self
 227
 228
 229 class _IntegralValue(_NumericValue, numbers.Integral):
 230     def __lshift__(self, other):
 231         return self._value << self._extract_value(other)
 232
 233     def __rlshift__(self, other):
 234         return self._extract_value(other) << self._value
 235
 236     def __rshift__(self, other):
 237         return self._value >> self._extract_value(other)
 238
 239     def __rrshift__(self, other):
 240         return self._extract_value(other) >> self._value
 241
 242     def __and__(self, other):
 243         return self._value & self._extract_value(other)
 244
 245     def __rand__(self, other):
 246         return self._extract_value(other) & self._value
 247
 248     def __xor__(self, other):
 249         return self._value ^ self._extract_value(other)
 250
 251     def __rxor__(self, other):
 252         return self._extract_value(other) ^ self._value
 253
 254     def __or__(self, other):
 255         return self._value | self._extract_value(other)
 256
 257     def __ror__(self, other):
 258         return self._extract_value(other) | self._value
 259
 260     def __invert__(self):
 261         return ~self._value
 262
 263     def __ilshift__(self, other):
 264         self.value = self << other
 265         return self
 266
 267     def __irshift__(self, other):
 268         self.value = self >> other
 269         return self
 270
 271     def __iand__(self, other):
 272         self.value = self & other
 273         return self
 274
 275     def __ixor__(self, other):
 276         self.value = self ^ other
 277         return self
 278
 279     def __ior__(self, other):
 280         self.value = self | other
 281         return self
 282
 283
 284 class _RealValue(_NumericValue, numbers.Real):
 285     pass
 286
 287
 288 class BoolValue(_IntegralValue):
 289     _NAME = 'Boolean'
 290
 291     def __init__(self, value=None):
 292         if value is None:
 293             ptr = native_bt.value_bool_create()
 294         else:
 295             ptr = native_bt.value_bool_create_init(self._value_to_bool(value))
 296
 297         self._check_create_status(ptr)
 298         super().__init__(ptr)
 299
 300     def __bool__(self):
 301         return self._value
 302
 303     def __repr__(self):
 304         return repr(self._value)
 305
 306     def _value_to_bool(self, value):
 307         if isinstance(value, BoolValue):
 308             value = value._value
 309
 310         if not isinstance(value, bool):
 311             raise TypeError("'{}' object is not a 'bool' or 'BoolValue' object".format(value.__class__))
 312
 313         return value
 314
 315     @property
 316     def _value(self):
 317         value = native_bt.value_bool_get(self._ptr)
 318         return value != 0
 319
 320     def _set_value(self, value):
 321         native_bt.value_bool_set(self._ptr, self._value_to_bool(value))
 322
 323     value = property(fset=_set_value)
 324
 325
 326 class _IntegerValue(_IntegralValue):
 327     def __init__(self, value=None):
 328         if value is None:
 329             ptr = self._create_default_value()
 330         else:
 331             ptr = self._create_value(self._value_to_int(value))
 332
 333         self._check_create_status(ptr)
 334         super().__init__(ptr)
 335
 336     def _value_to_int(self, value):
 337         if not isinstance(value, numbers.Real):
 338             raise TypeError('expecting a number object')
 339
 340         value = int(value)
 341         self._check_int_range(value)
 342         return value
 343
 344     @property
 345     def _value(self):
 346         return self._get_value(self._ptr)
 347
 348     def _prop_set_value(self, value):
 349         self._set_value(self._ptr, self._value_to_int(value))
 350
 351     value = property(fset=_prop_set_value)
 352
 353
 354 class UnsignedIntegerValue(_IntegerValue):
 355     _check_int_range = staticmethod(utils._check_uint64)
 356     _create_default_value = staticmethod(native_bt.value_unsigned_integer_create)
 357     _create_value = staticmethod(native_bt.value_unsigned_integer_create_init)
 358     _set_value = staticmethod(native_bt.value_unsigned_integer_set)
 359     _get_value = staticmethod(native_bt.value_unsigned_integer_get)
 360
 361
 362 class SignedIntegerValue(_IntegerValue):
 363     _check_int_range = staticmethod(utils._check_int64)
 364     _create_default_value = staticmethod(native_bt.value_signed_integer_create)
 365     _create_value = staticmethod(native_bt.value_signed_integer_create_init)
 366     _set_value = staticmethod(native_bt.value_signed_integer_set)
 367     _get_value = staticmethod(native_bt.value_signed_integer_get)
 368
 369
 370 class RealValue(_RealValue):
 371     _NAME = 'Real number'
 372
 373     def __init__(self, value=None):
 374         if value is None:
 375             ptr = native_bt.value_real_create()
 376         else:
 377             value = self._value_to_float(value)
 378             ptr = native_bt.value_real_create_init(value)
 379
 380         self._check_create_status(ptr)
 381         super().__init__(ptr)
 382
 383     def _value_to_float(self, value):
 384         if not isinstance(value, numbers.Real):
 385             raise TypeError("expecting a real number object")
 386
 387         return float(value)
 388
 389     @property
 390     def _value(self):
 391         return native_bt.value_real_get(self._ptr)
 392
 393     def _set_value(self, value):
 394         native_bt.value_real_set(self._ptr, self._value_to_float(value))
 395
 396     value = property(fset=_set_value)
 397
 398
 399 @functools.total_ordering
 400 class StringValue(collections.abc.Sequence, _Value):
 401     _NAME = 'String'
 402
 403     def __init__(self, value=None):
 404         if value is None:
 405             ptr = native_bt.value_string_create()
 406         else:
 407             ptr = native_bt.value_string_create_init(self._value_to_str(value))
 408
 409         self._check_create_status(ptr)
 410         super().__init__(ptr)
 411
 412     def _value_to_str(self, value):
 413         if isinstance(value, self.__class__):
 414             value = value._value
 415
 416         utils._check_str(value)
 417         return value
 418
 419     @property
 420     def _value(self):
 421         return native_bt.value_string_get(self._ptr)
 422
 423     def _set_value(self, value):
 424         status = native_bt.value_string_set(self._ptr, self._value_to_str(value))
 425         self._handle_status(status)
 426
 427     value = property(fset=_set_value)
 428
 429     def __eq__(self, other):
 430         try:
 431             return self._value == self._value_to_str(other)
 432         except:
 433             return False
 434
 435     def __lt__(self, other):
 436         return self._value < self._value_to_str(other)
 437
 438     def __bool__(self):
 439         return bool(self._value)
 440
 441     def __repr__(self):
 442         return repr(self._value)
 443
 444     def __str__(self):
 445         return self._value
 446
 447     def __getitem__(self, index):
 448         return self._value[index]
 449
 450     def __len__(self):
 451         return len(self._value)
 452
 453     def __iadd__(self, value):
 454         curvalue = self._value
 455         curvalue += self._value_to_str(value)
 456         self.value = curvalue
 457         return self
 458
 459
 460 class _Container:
 461     def __bool__(self):
 462         return len(self) != 0
 463
 464     def __delitem__(self, index):
 465         raise NotImplementedError
 466
 467
 468 class ArrayValue(_Container, collections.abc.MutableSequence, _Value):
 469     _NAME = 'Array'
 470
 471     def __init__(self, value=None):
 472         ptr = native_bt.value_array_create()
 473         self._check_create_status(ptr)
 474         super().__init__(ptr)
 475
 476         # Python will raise a TypeError if there's anything wrong with
 477         # the iterable protocol.
 478         if value is not None:
 479             for elem in value:
 480                 self.append(elem)
 481
 482     def __eq__(self, other):
 483         if not isinstance(other, collections.abc.Sequence):
 484             return False
 485
 486         if len(self) != len(other):
 487             # early mismatch
 488             return False
 489
 490         for self_elem, other_elem in zip(self, other):
 491             if self_elem != other_elem:
 492                 return False
 493
 494         return True
 495
 496     def __len__(self):
 497         size = native_bt.value_array_get_size(self._ptr)
 498         assert(size >= 0)
 499         return size
 500
 501     def _check_index(self, index):
 502         # TODO: support slices also
 503         if not isinstance(index, numbers.Integral):
 504             raise TypeError("'{}' object is not an integral number object: invalid index".format(index.__class__.__name__))
 505
 506         index = int(index)
 507
 508         if index < 0 or index >= len(self):
 509             raise IndexError('array value object index is out of range')
 510
 511     def __getitem__(self, index):
 512         self._check_index(index)
 513         ptr = native_bt.value_array_borrow_element_by_index(self._ptr, index)
 514         assert(ptr)
 515         return _create_from_ptr_and_get_ref(ptr)
 516
 517     def __setitem__(self, index, value):
 518         self._check_index(index)
 519         value = create_value(value)
 520
 521         if value is None:
 522             ptr = native_bt.value_null
 523         else:
 524             ptr = value._ptr
 525
 526         status = native_bt.value_array_set_element_by_index(
 527             self._ptr, index, ptr)
 528         self._handle_status(status)
 529
 530     def append(self, value):
 531         value = create_value(value)
 532
 533         if value is None:
 534             ptr = native_bt.value_null
 535         else:
 536             ptr = value._ptr
 537
 538         status = native_bt.value_array_append_element(self._ptr, ptr)
 539         self._handle_status(status)
 540
 541     def __iadd__(self, iterable):
 542         # Python will raise a TypeError if there's anything wrong with
 543         # the iterable protocol.
 544         for elem in iterable:
 545             self.append(elem)
 546
 547         return self
 548
 549     def __repr__(self):
 550         return '[{}]'.format(', '.join([repr(v) for v in self]))
 551
 552     def insert(self, value):
 553         raise NotImplementedError
 554
 555
 556 class _MapValueKeyIterator(collections.abc.Iterator):
 557     def __init__(self, map_obj):
 558         self._map_obj = map_obj
 559         self._at = 0
 560         keys_ptr = native_bt.value_map_get_keys(map_obj._ptr)
 561
 562         if keys_ptr is None:
 563             raise RuntimeError('unexpected error: cannot get map value object keys')
 564
 565         self._keys = _create_from_ptr(keys_ptr)
 566
 567     def __next__(self):
 568         if self._at == len(self._map_obj):
 569             raise StopIteration
 570
 571         key = self._keys[self._at]
 572         self._at += 1
 573         return str(key)
 574
 575
 576 class MapValue(_Container, collections.abc.MutableMapping, _Value):
 577     _NAME = 'Map'
 578
 579     def __init__(self, value=None):
 580         ptr = native_bt.value_map_create()
 581         self._check_create_status(ptr)
 582         super().__init__(ptr)
 583
 584         # Python will raise a TypeError if there's anything wrong with
 585         # the iterable/mapping protocol.
 586         if value is not None:
 587             for key, elem in value.items():
 588                 self[key] = elem
 589
 590     def __ne__(self, other):
 591         return _Value.__ne__(self, other)
 592
 593     def __eq__(self, other):
 594         if not isinstance(other, collections.abc.Mapping):
 595             return False
 596
 597         if len(self) != len(other):
 598             # early mismatch
 599             return False
 600
 601         for self_key in self:
 602             if self_key not in other:
 603                 return False
 604
 605             if self[self_key] != other[self_key]:
 606                 return False
 607
 608         return True
 609
 610     def __len__(self):
 611         size = native_bt.value_map_get_size(self._ptr)
 612         assert(size >= 0)
 613         return size
 614
 615     def __contains__(self, key):
 616         self._check_key_type(key)
 617         return native_bt.value_map_has_entry(self._ptr, key)
 618
 619     def _check_key_type(self, key):
 620         utils._check_str(key)
 621
 622     def _check_key(self, key):
 623         if key not in self:
 624             raise KeyError(key)
 625
 626     def __getitem__(self, key):
 627         self._check_key(key)
 628         ptr = native_bt.value_map_borrow_entry_value(self._ptr, key)
 629         assert(ptr)
 630         return _create_from_ptr_and_get_ref(ptr)
 631
 632     def __iter__(self):
 633         return _MapValueKeyIterator(self)
 634
 635     def __setitem__(self, key, value):
 636         self._check_key_type(key)
 637         value = create_value(value)
 638
 639         if value is None:
 640             ptr = native_bt.value_null
 641         else:
 642             ptr = value._ptr
 643
 644         status = native_bt.value_map_insert_entry(self._ptr, key, ptr)
 645         self._handle_status(status)
 646
 647     def __repr__(self):
 648         items = ['{}: {}'.format(repr(k), repr(v)) for k, v in self.items()]
 649         return '{{{}}}'.format(', '.join(items))
 650
 651
 652 _TYPE_TO_OBJ = {
 653     native_bt.VALUE_TYPE_BOOL: BoolValue,
 654     native_bt.VALUE_TYPE_UNSIGNED_INTEGER: UnsignedIntegerValue,
 655     native_bt.VALUE_TYPE_SIGNED_INTEGER: SignedIntegerValue,
 656     native_bt.VALUE_TYPE_REAL: RealValue,
 657     native_bt.VALUE_TYPE_STRING: StringValue,
 658     native_bt.VALUE_TYPE_ARRAY: ArrayValue,
 659     native_bt.VALUE_TYPE_MAP: MapValue,
 660 }