Source code for rpy2.rinterface_lib.sexp

"""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