def _apply_columns_list(collist, colsdesc):
n = len(colsdesc)
nn = len(collist)
if n != nn:
raise ValueError("Input contains %s, whereas `columns` "
"parameter specifies only %s"
% (plural(n, "column"), plural(nn, "column")))
colnames = []
coltypes = [rtype.rdrop.value] * n
for i in range(n):
entry = collist[i]
if entry is None or entry is False:
pass
elif entry is True or entry is Ellipsis:
colnames.append(colsdesc[i].name)
coltypes[i] = rtype.rauto.value
elif isinstance(entry, str):
colnames.append(entry)
coltypes[i] = rtype.rauto.value
elif isinstance(entry, (stype, ltype, type)):
colnames.append(colsdesc[i].name)
coltypes[i] = _rtypes_map[entry].value
elif isinstance(entry, tuple):
newname, newtype = entry
if newtype not in _rtypes_map:
raise ValueError("Unknown type %r used as an override "
"for column %r" % (newtype, newname))
colnames.append(newname)
coltypes[i] = _rtypes_map[newtype].value
else:
raise TypeError("Entry `columns[%d]` has invalid type %r"
% (i, entry.__class__.__name__))
return (colnames, coltypes)
def _apply_columns_dict(colsdict, colsdesc):
default_entry = colsdict.get(..., ...)
colnames = []
coltypes = [rtype.rdrop.value] * len(colsdesc)
new_entries = {}
for key, val in colsdict.items():
if isinstance(key, (type, stype, ltype)):
if isinstance(val, str):
val = [val]
if isinstance(val, slice):
val = [
colsdesc[i].name
for i in range(*val.indices(len(colsdesc)))
]
if isinstance(val, range):
val = [colsdesc[i].name for i in val]
if isinstance(val, (list, tuple, set)):
for entry in val:
if not isinstance(entry, str):
raise TypeError(
"Type %s in the `columns` parameter should map"
" to a string or list of strings (column names)"
"; however it contains an entry %r" % (key, entry))
if entry in colsdict:
continue
new_entries[entry] = key
else:
raise TypeError("Unknown entry %r for %s in `columns`" %
(val, key))
if new_entries:
colsdict = {**colsdict, **new_entries}
for i, desc in enumerate(colsdesc):
name = desc.name
entry = colsdict.get(name, default_entry)
if entry is None:
pass # coltype is already "drop"
elif entry is Ellipsis:
colnames.append(name)
coltypes[i] = rtype.rauto.value
elif isinstance(entry, str):
colnames.append(entry)
coltypes[i] = rtype.rauto.value
elif isinstance(entry, (stype, ltype, type)):
colnames.append(name)
coltypes[i] = _rtypes_map[entry].value
elif isinstance(entry, tuple):
newname, newtype = entry
colnames.append(newname)
coltypes[i] = _rtypes_map[newtype].value
assert isinstance(newname, str)
if not coltypes[i]:
raise ValueError("Unknown type %r used as an override "
"for column %r" % (newtype, newname))
else:
raise TypeError("Unknown value %r for column '%s' in "
"columns descriptor" % (entry, name))
return (colnames, coltypes)
def _apply_columns_slice(colslice, colsdesc):
n = len(colsdesc)
if isinstance(colslice, slice):
start, count, step = normalize_slice(colslice, n)
else:
t = normalize_range(colslice, n)
if t is None:
raise ValueError("Invalid range iterator for a file with "
"%d columns: %r" % (n, colslice))
start, count, step = t
if step <= 0:
raise ValueError("Cannot use slice/range with negative step "
"for column filter: %r" % colslice)
colnames = [None] * count
coltypes = [rtype.rdrop.value] * n
for j in range(count):
i = start + j * step
colnames[j] = colsdesc[i].name
coltypes[i] = rtype.rauto.value
return (colnames, coltypes)
def _resolve_source(self, anysource, file, text, cmd, url):
args = (["any"] * (anysource is not None) + ["file"] *
(file is not None) + ["text"] * (text is not None) + ["cmd"] *
(cmd is not None) + ["url"] * (url is not None))
if len(args) == 0:
raise ValueError(
"No input source for `fread` was given. Please specify one of "
"the parameters `file`, `text`, `url`, or `cmd`")
if len(args) > 1:
if anysource is None:
raise ValueError(
"Both parameters `%s` and `%s` cannot be passed to fread "
"simultaneously." % (args[0], args[1]))
else:
args.remove("any")
raise ValueError(
"When an unnamed argument is passed, it is invalid to also "
"provide the `%s` parameter." % (args[0], ))
self._resolve_source_any(anysource)
self._resolve_source_text(text)
self._resolve_source_file(file)
self._resolve_source_cmd(cmd)
self._resolve_source_url(url)
def _resolve_source_cmd(cmd):
import subprocess
if not isinstance(cmd, str):
raise TypeError("Invalid parameter `cmd` in fread: expected str, "
"got %r" % type(cmd))
proc = subprocess.Popen(cmd, shell=True,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
msgout, msgerr = proc.communicate()
ret = proc.returncode
if ret:
msgerr = msgerr.decode("utf-8", errors="replace").strip()
raise ValueError("Shell command returned error code %r: `%s`"
% (ret, msgerr))
else:
# src, file, fileno, text, result
return (cmd, None, None, msgout), None
def ___new___(cls, value):
# We're re-implementing Enum.__new__() method, which is called by the
# metaclass' `__call__` (for example `stype(5)` or `stype("int64")`).
# Also called by pickle.
if isinstance(value, cls):
return value
try:
if value in cls._value2member_map_ and not isinstance(value, bool):
return cls._value2member_map_[value]
if not isinstance(value, int) and not _numpy_init_attempted:
_init_numpy_transforms()
if value in cls._value2member_map_:
return cls._value2member_map_[value]
except TypeError:
# `value` is not hasheable -- not valid for our enum. Pass-through
# and raise the ValueError below.
pass
raise ValueError("`%r` does not map to any %s" % (value, cls.__name__))
def _resolve_source_file(file, tempfiles):
logger = tempfiles._logger
if isinstance(file, _pathlike):
# `_pathlike` contains (str, bytes), and on Python 3.6 also
# os.PathLike interface
file = os.path.expanduser(file)
file = os.fsdecode(file)
elif isinstance(file, pathlib.Path):
# This is only for Python 3.5; in Python 3.6 pathlib.Path implements
# os.PathLike interface and is included in `_pathlike`.
file = file.expanduser()
file = str(file)
elif hasattr(file, "read") and callable(file.read):
out_src = None
out_fileno = None
out_text = None
# A builtin `file` object, or something similar. We check for the
# presence of `fileno` attribute, which will allow us to provide a
# more direct access to the underlying file.
# noinspection PyBroadException
try:
if sys.platform == "win32":
raise Exception("Do not use file descriptors on Windows")
# .fileno can be either a method, or a property
# The implementation of .fileno may raise an exception too
# (indicating that no file descriptor is available)
fd = file.fileno
if callable(fd):
fd = fd()
if not isinstance(fd, int) or fd <= 0:
raise Exception
out_fileno = fd
except Exception:
# Catching if: file.fileno is not defined, or is not an integer,
# or raises an error, or returns a closed file descriptor
rawtxt = file.read()
out_text = rawtxt
file = getattr(file, "name", None)
if not isinstance(file, (str, bytes)):
out_src = "<file>"
elif isinstance(file, bytes):
out_src = os.fsdecode(file)
else:
out_src = file
return (out_src, None, out_fileno, out_text), None
else:
raise TypeError("Invalid parameter `file` in fread: expected a "
"str/bytes/PathLike, got %r" % type(file))
# if `file` is not str, then `os.path.join(file, "..")` below will fail
assert isinstance(file, str)
if not os.path.exists(file):
# File does not exist -- search up the tree for the first file that
# does. This will allow us to provide a better error message to the
# user; also if the first path component that exists is a file (not
# a folder), then the user probably tries to specify a file within
# an archive -- and this is not an error at all!
xpath = os.path.abspath(file)
ypath = xpath
while not os.path.exists(xpath):
xpath = os.path.abspath(os.path.join(xpath, ".."))
ypath = ypath[len(xpath):]
if os.path.isfile(xpath):
return _resolve_archive(xpath, ypath, tempfiles)
else:
raise ValueError("File %s`%s` does not exist"
% (escape(xpath), escape(ypath)))
if not os.path.isfile(file):
raise ValueError("Path `%s` is not a file" % escape(file))
return _resolve_archive(file, None, tempfiles)
def _resolve_archive(self, filename, subpath=None):
ext = os.path.splitext(filename)[1]
if subpath and subpath[0] == "/":
subpath = subpath[1:]
if ext == ".zip":
import zipfile
zf = zipfile.ZipFile(filename)
# MacOS is found guilty of adding extra files into the Zip archives
# it creates. The files are hidden, and in the directory __MACOSX/.
# We remove those files from the list, since they are not real user
# files, and have an unknown binary format.
zff = [
name for name in zf.namelist()
if not (name.startswith("__MACOSX/") or name.endswith("/"))
]
if subpath:
if subpath in zff:
zff = [subpath]
else:
raise ValueError(
"File `%s` does not exist in archive `%s`" %
(subpath, filename))
if len(zff) > 1:
warnings.warn(
"Zip file %s contains multiple compressed "
"files: %r. Only the first of them will be used." %
(filename, zff),
category=FreadWarning)
if len(zff) == 0:
raise ValueError("Zip file %s is empty" % filename)
if self._verbose:
self._logger.debug("Extracting %s to temporary directory %s" %
(filename, self.tempdir))
self._tempfiles.append(zf.extract(zff[0], path=self.tempdir))
self._file = self._tempfiles[-1]
elif ext == ".gz":
import gzip
zf = gzip.GzipFile(filename, mode="rb")
if self._verbose:
self._logger.debug("Extracting %s into memory" % filename)
self._text = zf.read()
if self._verbose:
self._logger.debug("Extracted: size = %d" % len(self._text))
elif ext == ".bz2":
import bz2
with bz2.open(filename, mode="rb") as zf:
if self._verbose:
self._logger.debug("Extracting %s into memory" % filename)
self._text = zf.read()
if self._verbose:
self._logger.debug("Extracted: size = %d" %
len(self._text))
elif ext == ".xz":
import lzma
with lzma.open(filename, mode="rb") as zf:
if self._verbose:
self._logger.debug("Extracting %s into memory" % filename)
self._text = zf.read()
if self._verbose:
self._logger.debug("Extracted: size = %d" %
len(self._text))
elif ext == ".xlsx" or ext == ".xls":
self._result = read_xls_workbook(filename, subpath)
elif ext == ".jay":
self._result = core.open_jay(filename)
else:
self._file = filename
