"""Base definitions for R objects."""
import abc
import collections.abc
import enum
import typing
from . import embedded
from . import memorymanagement
from . import openrlib
from . import _rinterface_capi as _rinterface
from . import conversion
class RTYPES(enum.IntEnum):
"""Native R types as defined in R's C API."""
NILSXP = openrlib.rlib.NILSXP
SYMSXP = openrlib.rlib.SYMSXP
LISTSXP = openrlib.rlib.LISTSXP
CLOSXP = openrlib.rlib.CLOSXP
ENVSXP = openrlib.rlib.ENVSXP
PROMSXP = openrlib.rlib.PROMSXP
LANGSXP = openrlib.rlib.LANGSXP
SPECIALSXP = openrlib.rlib.SPECIALSXP
BUILTINSXP = openrlib.rlib.BUILTINSXP
CHARSXP = openrlib.rlib.CHARSXP
LGLSXP = openrlib.rlib.LGLSXP
INTSXP = openrlib.rlib.INTSXP
REALSXP = openrlib.rlib.REALSXP
CPLXSXP = openrlib.rlib.CPLXSXP
STRSXP = openrlib.rlib.STRSXP
DOTSXP = openrlib.rlib.DOTSXP
ANYSXP = openrlib.rlib.ANYSXP
VECSXP = openrlib.rlib.VECSXP
EXPRSXP = openrlib.rlib.EXPRSXP
BCODESXP = openrlib.rlib.BCODESXP
EXTPTRSXP = openrlib.rlib.EXTPTRSXP
WEAKREFSXP = openrlib.rlib.WEAKREFSXP
RAWSXP = openrlib.rlib.RAWSXP
S4SXP = openrlib.rlib.S4SXP
NEWSXP = openrlib.rlib.NEWSXP
FREESXP = openrlib.rlib.FREESXP
FUNSXP = openrlib.rlib.FUNSXP
[docs]class Sexp(object):
"""Base class for R objects.
The name of a class corresponds to the name SEXP
used in R's C API."""
__slots__ = ('_sexpobject', )
def __init__(self, sexp: typing.Union['Sexp', '_rinterface.SexpCapsule']):
if not embedded.isready():
raise embedded.RNotReadyError('Embedded R is not ready to use.')
if isinstance(sexp, Sexp):
self._sexpobject = sexp.__sexp__
elif (isinstance(sexp, _rinterface.SexpCapsule) or
isinstance(sexp, _rinterface.UnmanagedSexpCapsule)):
self._sexpobject = sexp
else:
raise ValueError(
'The constructor must be called '
'with an instance of rpy2.rinterface.Sexp '
'or an instance of '
'rpy2.rinterface._rinterface.SexpCapsule')
def __repr__(self) -> str:
return super().__repr__() + (' [%s]' % self.typeof)
@property
def __sexp__(self) -> '_rinterface.SexpCapsule':
"""Access to the underlying C pointer to the R object.
When assigning a new SexpCapsule to this attribute, the
R C-level type of the new capsule must be equal to the
type of the old capsule. A ValueError is raised otherwise."""
return self._sexpobject
@__sexp__.setter
def __sexp__(self,
value: '_rinterface.SexpCapsule') -> None:
assert isinstance(value, _rinterface.SexpCapsule)
if value.typeof != self.__sexp__.typeof:
raise ValueError('New capsule type mismatch: %s' %
RTYPES(value.typeof))
self._sexpobject = value
@property
def __sexp_refcount__(self) -> int:
"""Count the number of independent Python references to
the underlying R object."""
return _rinterface._R_PRESERVED[
_rinterface.get_rid(self.__sexp__._cdata)
]
def __getstate__(self) -> bytes:
with memorymanagement.rmemory() as rmemory:
ser = rmemory.protect(
_rinterface.serialize(self.__sexp__._cdata,
embedded.globalenv.__sexp__._cdata)
)
n = openrlib.rlib.Rf_xlength(ser)
res = bytes(_rinterface.ffi.buffer(openrlib.rlib.RAW(ser), n))
return res
def __setstate__(self, state: bytes) -> None:
self._sexpobject = unserialize(state)
@property
def rclass(self) -> 'StrSexpVector':
"""Get or set the R "class" attribute for the object."""
return rclass_get(self.__sexp__)
@rclass.setter
def rclass(self,
value: 'typing.Union[StrSexpVector, str]'):
rclass_set(self.__sexp__, value)
@property
def rid(self) -> int:
"""ID of the underlying R object (memory address)."""
return _rinterface.get_rid(self.__sexp__._cdata)
@property
def typeof(self) -> RTYPES:
return RTYPES(_rinterface._TYPEOF(self.__sexp__._cdata))
@property
def named(self) -> int:
return _rinterface._NAMED(self.__sexp__._cdata)
@conversion._cdata_res_to_rinterface
def list_attrs(self) -> 'typing.Union[StrSexpVector, str]':
return _rinterface._list_attrs(self.__sexp__._cdata)
@conversion._cdata_res_to_rinterface
def do_slot(self, name: str) -> None:
_rinterface._assert_valid_slotname(name)
cchar = conversion._str_to_cchar(name)
with memorymanagement.rmemory() as rmemory:
name_r = rmemory.protect(openrlib.rlib.Rf_install(cchar))
if not _rinterface._has_slot(self.__sexp__._cdata, name_r):
raise LookupError(name)
res = openrlib.rlib.R_do_slot(self.__sexp__._cdata, name_r)
return res
[docs] def do_slot_assign(self, name: str, value) -> None:
_rinterface._assert_valid_slotname(name)
cchar = conversion._str_to_cchar(name)
with memorymanagement.rmemory() as rmemory:
name_r = rmemory.protect(openrlib.rlib.Rf_install(cchar))
cdata = rmemory.protect(conversion._get_cdata(value))
openrlib.rlib.R_do_slot_assign(self.__sexp__._cdata,
name_r,
cdata)
@conversion._cdata_res_to_rinterface
def get_attrib(self, name: str) -> 'Sexp':
res = openrlib.rlib.Rf_getAttrib(self.__sexp__._cdata,
conversion._str_to_charsxp(name))
return res
# TODO: deprecate this (and implement __eq__) ?
[docs] def rsame(self, sexp) -> bool:
if isinstance(sexp, Sexp):
return self.__sexp__._cdata == sexp.__sexp__._cdata
elif isinstance(sexp, _rinterface.SexpCapsule):
return sexp._cdata == sexp._cdata
else:
raise ValueError('Not an R object.')
@property
def names(self) -> 'Sexp':
# TODO: force finding function
return embedded.globalenv.find('names')(self)
@names.setter
def names(self, value) -> None:
if not isinstance(value, StrSexpVector):
raise ValueError('The new names should be a StrSexpVector.')
openrlib.rlib.Rf_namesgets(
self.__sexp__._cdata, value.__sexp__._cdata)
@property
@conversion._cdata_res_to_rinterface
def names_from_c_attribute(self) -> 'Sexp':
return openrlib.rlib.Rf_getAttrib(
self.__sexp__._cdata,
openrlib.rlib.R_NameSymbol)
class CETYPE(enum.Enum):
"""Character encodings for R string."""
CE_NATIVE = 0
CE_UTF8 = 1
CE_LATIN1 = 2
CE_BYTES = 3
CE_SYMBOL = 5
CE_ANY = 99
class NCHAR_TYPE(enum.Enum):
"""Type of string scalar in R."""
Bytes = 0
Chars = 1
Width = 2
class CharSexp(Sexp):
"""R's internal (C API-level) scalar for strings."""
_R_TYPE = openrlib.rlib.CHARSXP
_NCHAR_MSG = openrlib.ffi.new('char []', b'rpy2.rinterface.CharSexp.nchar')
@property
def encoding(self) -> CETYPE:
return CETYPE(
openrlib.rlib.Rf_getCharCE(self.__sexp__._cdata)
)
def nchar(self, what: NCHAR_TYPE = NCHAR_TYPE.Bytes) -> int:
# TODO: nchar_type is not parsed properly by cffi ?
return openrlib.rlib.R_nchar(self.__sexp__._cdata,
what.value,
openrlib.rlib.FALSE,
openrlib.rlib.FALSE,
self._NCHAR_MSG)
# TODO: move to _rinterface-level function (as ABI / API compatibility
# will have API-defined code compile for efficiency).
def _populate_r_vector(iterable, r_vector, set_elt, cast_value):
for i, v in enumerate(iterable):
set_elt(r_vector, i, cast_value(v))
VT = typing.TypeVar('VT', bound='SexpVector')
[docs]class SexpVector(Sexp, metaclass=abc.ABCMeta):
"""Base abstract class for R vector objects.
R vector objects are, at the C level, essentially C arrays wrapped in
the general structure for R objects."""
@property
@abc.abstractmethod
def _R_TYPE(self):
pass
@property
@abc.abstractmethod
def _R_SIZEOF_ELT(self):
pass
@staticmethod
@abc.abstractmethod
def _CAST_IN(self):
pass
@staticmethod
@abc.abstractmethod
def _R_SET_VECTOR_ELT(self):
pass
@staticmethod
@abc.abstractmethod
def _R_VECTOR_ELT(self):
pass
@staticmethod
@abc.abstractmethod
def _R_GET_PTR(self):
pass
def __init__(self,
obj: typing.Union[_rinterface.SexpCapsule,
collections.abc.Sized]):
if isinstance(obj, Sexp) or isinstance(obj,
_rinterface.SexpCapsule):
super().__init__(obj)
elif isinstance(obj, collections.abc.Sized):
super().__init__(type(self).from_object(obj).__sexp__)
else:
raise TypeError('The constructor must be called '
'with an instance of '
'rpy2.rinterface.Sexp '
'or an instance of '
'rpy2.rinterface._rinterface.SexpCapsule')
@classmethod
@conversion._cdata_res_to_rinterface
def from_iterable(cls, iterable,
cast_in: bool = None) -> VT:
"""Create an R vector/array from an iterable."""
if not embedded.isready():
raise embedded.RNotReadyError('Embedded R is not ready to use.')
if cast_in is None:
cast_in = cls._CAST_IN
n = len(iterable)
with memorymanagement.rmemory() as rmemory:
r_vector = rmemory.protect(
openrlib.rlib.Rf_allocVector(
cls._R_TYPE, n)
)
_populate_r_vector(iterable,
r_vector,
cls._R_SET_VECTOR_ELT,
cast_in)
return r_vector
@classmethod
@conversion._cdata_res_to_rinterface
def from_memoryview(cls, mview: memoryview) -> VT:
"""Create an R vector/array from a memoryview.
The memoryview must be contiguous, and the C representation
for the vector must be compatible between R and Python. If
not the case, a :class:`ValueError` exception with will be
raised."""
if not embedded.isready():
raise embedded.RNotReadyError('Embedded R is not ready to use.')
if not mview.contiguous:
raise ValueError('The memory view must be contiguous.')
if mview.itemsize != cls._R_SIZEOF_ELT:
msg = (
'Incompatible C type sizes. '
'The R array type is {r_size} bytes '
'while the Python array type is {py_size} '
'bytes.'
.format(r_size=cls._R_SIZEOF_ELT,
py_size=mview.itemsize)
)
raise ValueError(msg)
r_vector = None
n = len(mview)
with memorymanagement.rmemory() as rmemory:
r_vector = rmemory.protect(
openrlib.rlib.Rf_allocVector(
cls._R_TYPE, n)
)
dest_ptr = cls._R_GET_PTR(r_vector)
src_ptr = _rinterface.ffi.from_buffer(mview)
nbytes = n * mview.itemsize
_rinterface.ffi.memmove(dest_ptr, src_ptr, nbytes)
return r_vector
[docs] @classmethod
def from_object(cls, obj) -> VT:
"""Create an R vector/array from a Python object, if possible.
An exception :class:`ValueError` will be raised if not possible."""
res = None
try:
mv = memoryview(obj)
res = cls.from_memoryview(mv)
except (TypeError, ValueError):
try:
res = cls.from_iterable(obj)
except ValueError:
msg = ('The class methods from_memoryview() and '
'from_iterable() both failed to make a {} '
'from an object of class {}'
.format(cls, type(obj)))
raise ValueError(msg)
return res
def __getitem__(
self,
i: typing.Union[int, slice]) -> typing.Union[Sexp, VT]:
cdata = self.__sexp__._cdata
if isinstance(i, int):
i_c = _rinterface._python_index_to_c(cdata, i)
res = conversion._cdata_to_rinterface(
self._R_VECTOR_ELT(cdata, i_c))
elif isinstance(i, slice):
res = type(self).from_iterable(
[
self._R_VECTOR_ELT(
cdata, i_c
) for i_c in range(*i.indices(len(self)))
],
cast_in=lambda x: x
)
else:
raise TypeError(
'Indices must be integers or slices, not %s' % type(i))
return res
def __setitem__(self, i: typing.Union[int, slice], value) -> None:
cdata = self.__sexp__._cdata
if isinstance(i, int):
i_c = _rinterface._python_index_to_c(cdata, i)
self._R_SET_VECTOR_ELT(cdata, i_c,
value.__sexp__._cdata)
elif isinstance(i, slice):
for i_c, v in zip(range(*i.indices(len(self))), value):
self._R_SET_VECTOR_ELT(cdata, i_c,
v.__sexp__._cdata)
else:
raise TypeError(
'Indices must be integers or slices, not %s' % type(i))
def __len__(self) -> int:
return openrlib.rlib.Rf_xlength(self.__sexp__._cdata)
def index(self, item) -> int:
for i, e in enumerate(self):
if e == item:
return i
raise ValueError("'%s' is not in R vector" % item)
def _as_charsxp_cdata(x: typing.Union[CharSexp, str]):
if isinstance(x, CharSexp):
return x.__sexp__._cdata
else:
return conversion._str_to_charsxp(x)
[docs]class StrSexpVector(SexpVector):
"""R vector of strings."""
_R_TYPE = openrlib.rlib.STRSXP
_R_GET_PTR = openrlib._STRING_PTR
_R_SIZEOF_ELT = None
_R_VECTOR_ELT = openrlib.rlib.STRING_ELT
_R_SET_VECTOR_ELT = openrlib.rlib.SET_STRING_ELT
_CAST_IN = _as_charsxp_cdata
def __getitem__(
self,
i: typing.Union[int, slice]) -> 'typing.Union[str, StrSexpVector]':
cdata = self.__sexp__._cdata
if isinstance(i, int):
i_c = _rinterface._python_index_to_c(cdata, i)
res = _rinterface._string_getitem(cdata, i_c)
elif isinstance(i, slice):
res = type(self).from_iterable(
[_rinterface._string_getitem(cdata, i_c)
for i_c in range(*i.indices(len(self)))]
)
else:
raise TypeError('Indices must be integers or slices,'
' not %s' % type(i))
return res
def __setitem__(self,
i: typing.Union[int, slice],
value: typing.Union[str, typing.Sequence[str]]) -> None:
cdata = self.__sexp__._cdata
if isinstance(i, int):
i_c = _rinterface._python_index_to_c(cdata, i)
self._R_SET_VECTOR_ELT(
cdata, i_c,
_as_charsxp_cdata(value)
)
elif isinstance(i, slice):
for i_c, v in zip(range(*i.indices(len(self))), value):
self._R_SET_VECTOR_ELT(
cdata, i_c,
_as_charsxp_cdata(v)
)
else:
raise TypeError('Indices must be integers or slices, '
'not %s' % type(i))
[docs] def get_charsxp(self, i: typing.Union[int, slice]) -> CharSexp:
"""Get the R CharSexp objects for the index i."""
i_c = _rinterface._python_index_to_c(self.__sexp__._cdata, i)
return CharSexp(
_rinterface.SexpCapsule(
openrlib.rlib.STRING_ELT(self.__sexp__._cdata, i_c)
)
)
# TODO: complete class names.
_DEFAULT_RCLASS_NAMES = {
RTYPES.ENVSXP: 'environment',
RTYPES.CLOSXP: 'function',
RTYPES.SPECIALSXP: 'function',
RTYPES.BUILTINSXP: 'function',
RTYPES.REALSXP: 'numeric',
RTYPES.STRSXP: 'character',
RTYPES.SYMSXP: 'name',
RTYPES.VECSXP: 'list',
RTYPES.LANGSXP: 'language'}
def rclass_get(scaps: _rinterface.SexpCapsule) -> StrSexpVector:
rlib = openrlib.rlib
with memorymanagement.rmemory() as rmemory:
classes = rmemory.protect(
rlib.Rf_getAttrib(scaps._cdata,
rlib.R_ClassSymbol))
if rlib.Rf_length(classes) == 0:
dim = rmemory.protect(
rlib.Rf_getAttrib(scaps._cdata,
rlib.R_DimSymbol))
ndim = rlib.Rf_length(dim)
if ndim > 0:
if ndim == 2:
classname = 'matrix'
else:
classname = 'array'
else:
typeof = RTYPES(scaps.typeof)
classname = _DEFAULT_RCLASS_NAMES.get(
typeof, str(typeof))
classes = StrSexpVector.from_iterable(
[classname])
else:
classes = conversion._cdata_to_rinterface(classes)
return classes
def rclass_set(
scaps: _rinterface.SexpCapsule,
value: 'typing.Union[StrSexpVector, str]'
) -> None:
if isinstance(value, StrSexpVector):
value_r = value
elif isinstance(value, str):
value_r = StrSexpVector.from_iterable(
[value])
else:
raise TypeError('Value should a str or '
'a rpy2.rinterface.sexp.StrSexpVector.')
openrlib.rlib.Rf_setAttrib(scaps._cdata,
openrlib.rlib.R_ClassSymbol,
value_r.__sexp__._cdata)
def unserialize(state):
n = len(state)
with memorymanagement.rmemory() as rmemory:
cdata = rmemory.protect(
openrlib.rlib.Rf_allocVector(openrlib.rlib.RAWSXP, n))
_rinterface.ffi.memmove(
openrlib.rlib.RAW(cdata), state, n)
ser = rmemory.protect(
_rinterface.unserialize(cdata,
embedded.globalenv.__sexp__._cdata)
)
res = _rinterface.SexpCapsule(ser)
return res
