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form.py
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form.py
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# BSD 3-Clause License; see https://github.com/scikit-hep/awkward/blob/main/LICENSE
from __future__ import annotations
import itertools
import json
import re
from collections import defaultdict
from collections.abc import Callable, Iterable, Mapping
from fnmatch import fnmatchcase
from glob import escape as escape_glob
import awkward as ak
from awkward._backends.numpy import NumpyBackend
from awkward._meta.meta import Meta
from awkward._nplikes.numpy_like import NumpyMetadata
from awkward._nplikes.shape import ShapeItem, unknown_length
from awkward._parameters import (
parameters_are_equal,
parameters_union,
type_parameters_equal,
)
from awkward._typing import (
Any,
DType,
Final,
Iterator,
JSONMapping,
Self,
)
__all__ = ("from_dict", "from_type", "from_json", "reserved_nominal_parameters", "Form")
np = NumpyMetadata.instance()
numpy_backend = NumpyBackend.instance()
reserved_nominal_parameters: Final = frozenset(
{
("__array__", "string"),
("__array__", "bytestring"),
("__array__", "char"),
("__array__", "byte"),
("__array__", "sorted_map"),
("__array__", "categorical"),
}
)
def from_dict(input: Mapping) -> Form:
assert input is not None
if isinstance(input, str):
return ak.forms.NumpyForm(primitive=input)
assert isinstance(input, Mapping)
parameters = input.get("parameters", None)
form_key = input.get("form_key", None)
if input["class"] == "NumpyArray":
primitive = input["primitive"]
inner_shape = tuple(
unknown_length if item is None else item
for item in input.get("inner_shape", [])
)
return ak.forms.NumpyForm(
primitive, inner_shape, parameters=parameters, form_key=form_key
)
elif input["class"] == "EmptyArray":
return ak.forms.EmptyForm(parameters=parameters, form_key=form_key)
elif input["class"] == "RegularArray":
return ak.forms.RegularForm(
content=from_dict(input["content"]),
size=unknown_length if input["size"] is None else input["size"],
parameters=parameters,
form_key=form_key,
)
elif input["class"] in ("ListArray", "ListArray32", "ListArrayU32", "ListArray64"):
return ak.forms.ListForm(
starts=input["starts"],
stops=input["stops"],
content=from_dict(input["content"]),
parameters=parameters,
form_key=form_key,
)
elif input["class"] in (
"ListOffsetArray",
"ListOffsetArray32",
"ListOffsetArrayU32",
"ListOffsetArray64",
):
return ak.forms.ListOffsetForm(
offsets=input["offsets"],
content=from_dict(input["content"]),
parameters=parameters,
form_key=form_key,
)
elif input["class"] == "RecordArray":
# New serialisation
if "fields" in input:
if isinstance(input["contents"], Mapping):
raise TypeError("new-style RecordForm contents must not be mappings")
contents = [from_dict(content) for content in input["contents"]]
fields = input["fields"]
# Old style record
elif isinstance(input["contents"], Mapping):
contents = []
fields = []
for key, content in input["contents"].items():
contents.append(from_dict(content))
fields.append(key)
# Old style tuple
else:
contents = [from_dict(content) for content in input["contents"]]
fields = None
return ak.forms.RecordForm(
contents=contents,
fields=fields,
parameters=parameters,
form_key=form_key,
)
elif input["class"] in (
"IndexedArray",
"IndexedArray32",
"IndexedArrayU32",
"IndexedArray64",
):
return ak.forms.IndexedForm(
index=input["index"],
content=from_dict(input["content"]),
parameters=parameters,
form_key=form_key,
)
elif input["class"] in (
"IndexedOptionArray",
"IndexedOptionArray32",
"IndexedOptionArray64",
):
return ak.forms.IndexedOptionForm(
index=input["index"],
content=from_dict(input["content"]),
parameters=parameters,
form_key=form_key,
)
elif input["class"] == "ByteMaskedArray":
return ak.forms.ByteMaskedForm(
mask=input["mask"],
content=from_dict(input["content"]),
valid_when=input["valid_when"],
parameters=parameters,
form_key=form_key,
)
elif input["class"] == "BitMaskedArray":
return ak.forms.BitMaskedForm(
mask=input["mask"],
content=from_dict(input["content"]),
valid_when=input["valid_when"],
lsb_order=input["lsb_order"],
parameters=parameters,
form_key=form_key,
)
elif input["class"] == "UnmaskedArray":
return ak.forms.UnmaskedForm(
content=from_dict(input["content"]),
parameters=parameters,
form_key=form_key,
)
elif input["class"] in (
"UnionArray",
"UnionArray8_32",
"UnionArray8_U32",
"UnionArray8_64",
):
return ak.forms.UnionForm(
tags=input["tags"],
index=input["index"],
contents=[from_dict(content) for content in input["contents"]],
parameters=parameters,
form_key=form_key,
)
elif input["class"] == "VirtualArray":
raise ValueError("Awkward 1.x VirtualArrays are not supported")
else:
raise ValueError(
"input class: {} was not recognised".format(repr(input["class"]))
)
def from_json(input: str) -> Form:
return from_dict(json.loads(input))
def from_type(type_: ak.types.Type) -> Form:
# Categorical types are reintroduced into forms using metadata
if type_.parameter("__categorical__"):
# Drop categorical placeholder parameter
if type_._parameters is None:
next_parameters = None
else:
next_parameters = type_._parameters.copy()
next_parameters.pop("__categorical__")
if isinstance(type_, ak.types.OptionType):
next_content = from_type(type_.content)
return ak.forms.IndexedOptionForm(
"i64",
next_content,
parameters=parameters_union(
next_parameters, {"__array__": "categorical"}
),
)
else:
next_content = from_type(type_.copy(parameters=next_parameters))
return ak.forms.IndexedForm(
"i64", next_content, parameters={"__array__": "categorical"}
)
if isinstance(type_, ak.types.NumpyType):
return ak.forms.NumpyForm(type_.primitive, parameters=type_._parameters)
elif isinstance(type_, ak.types.ListType):
return ak.forms.ListOffsetForm(
"i64", from_type(type_.content), parameters=type_._parameters
)
elif isinstance(type_, ak.types.RegularType):
return ak.forms.RegularForm(
from_type(type_.content),
size=type_.size,
parameters=type_._parameters,
)
elif isinstance(type_, ak.types.OptionType):
return ak.forms.IndexedOptionForm(
"i64",
from_type(type_.content),
parameters=type_._parameters,
)
elif isinstance(type_, ak.types.RecordType):
return ak.forms.RecordForm(
[from_type(c) for c in type_.contents],
type_.fields,
parameters=type_._parameters,
)
elif isinstance(type_, ak.types.UnionType):
return ak.forms.UnionForm(
"i8",
"i64",
[from_type(c) for c in type_.contents],
parameters=type_._parameters,
)
elif isinstance(type_, ak.types.UnknownType):
return ak.forms.EmptyForm(parameters=type_._parameters)
elif isinstance(type_, (ak.types.ArrayType, ak.types.ScalarType)):
raise TypeError(
"High-level types (ak.types.ArrayType, ak.types.ScalarType) do not have representations as Awkward forms. "
"Instead the low level type should be used."
)
else:
raise TypeError(f"unsupported type {type_!r}")
def _expand_braces(text, seen=None):
if seen is None:
seen = set()
spans = [m.span() for m in re.finditer(r"\{[^\{\}]*\}", text)][::-1]
alts = [text[start + 1 : stop - 1].split(",") for start, stop in spans]
if len(spans) == 0:
if text not in seen:
yield text
seen.add(text)
else:
for combo in itertools.product(*alts):
replaced = list(text)
for (start, stop), replacement in zip(spans, combo):
replaced[start:stop] = replacement
yield from _expand_braces("".join(replaced), seen)
class _SpecifierMatcher:
def __init__(
self, specifiers: Iterable[list[str]], *, match_if_empty: bool = False
):
# We'll build two sets of unique fixed-strings and patterns
fixed_strings = set()
patterns = set()
# And then map these unique strings to their child specifiers
match_to_next_specifiers: defaultdict[str, list[list[str]]] = defaultdict(list)
# For each specifier, categorise it as a fixed-string or pattern,
# and build the next-specifier table
parent: str
child: list[str]
for item in specifiers:
parent, *child = item
if escape_glob(parent) == parent:
fixed_strings.add(parent)
else:
patterns.add(parent)
# Only include child specifier list if it is non-empty
if child:
match_to_next_specifiers[parent].append(child)
self._match_to_next_specifiers = match_to_next_specifiers
self._fixed_strings = fixed_strings
self._patterns = patterns
self._match_if_empty = match_if_empty
@property
def is_empty(self) -> bool:
return not (self._patterns or self._fixed_strings)
def __call__(self, field: str, *, next_match_if_empty: bool = False) -> Self | None:
has_matched = False
# Fixed-strings are an O(log n) lookup
next_specifiers = []
if field in self._fixed_strings:
has_matched = True
next_specifiers.extend(self._match_to_next_specifiers[field])
# Fixed-strings are an O(n) lookup
for pattern in self._patterns:
if fnmatchcase(field, pattern):
has_matched = True
next_specifiers.extend(self._match_to_next_specifiers[pattern])
if has_matched:
return type(self)(next_specifiers, match_if_empty=next_match_if_empty)
elif self.is_empty and self._match_if_empty:
return self
else:
return None
def regularize_buffer_key(buffer_key: str | Callable) -> Callable[[Form, str], str]:
if isinstance(buffer_key, str):
def getkey(form, attribute):
return buffer_key.format(form_key=form.form_key, attribute=attribute)
return getkey
elif callable(buffer_key):
def getkey(form, attribute):
return buffer_key(form_key=form.form_key, attribute=attribute, form=form)
return getkey
else:
raise TypeError(
f"buffer_key must be a string or a callable, not {type(buffer_key)}"
)
index_to_dtype: Final[dict[str, DType]] = {
"i8": np.dtype("<i1"),
"u8": np.dtype("<u1"),
"i32": np.dtype("<i4"),
"u32": np.dtype("<u4"),
"i64": np.dtype("<i8"),
}
class Form(Meta):
def _init(self, *, parameters: JSONMapping | None, form_key: str | None):
if parameters is not None and not isinstance(parameters, dict):
raise TypeError(
f"{type(self).__name__} 'parameters' must be of type dict or None, not {parameters!r}"
)
if form_key is not None and not isinstance(form_key, str):
raise TypeError(
f"{type(self).__name__} 'form_key' must be of type string or None, not {form_key!r}"
)
self._parameters = parameters
self._form_key = form_key
@property
def form_key(self):
return self._form_key
@form_key.setter
def form_key(self, value):
if value is not None and not isinstance(value, str):
raise TypeError("form_key must be None or a string")
self._form_key = value
def __str__(self):
return json.dumps(self.to_dict(verbose=False), indent=4)
def to_dict(self, verbose=True):
return self._to_dict_part(verbose, toplevel=True)
def _to_dict_extra(self, out, verbose):
if verbose or (self._parameters is not None and len(self._parameters) > 0):
out["parameters"] = self.parameters
if verbose or self._form_key is not None:
out["form_key"] = self._form_key
return out
def to_json(self):
return json.dumps(self.to_dict(verbose=True))
def _repr_args(self):
out = []
if self._parameters is not None and len(self._parameters) > 0:
out.append("parameters=" + repr(self._parameters))
if self._form_key is not None:
out.append("form_key=" + repr(self._form_key))
return out
@property
def type(self):
raise NotImplementedError
def columns(self, list_indicator=None, column_prefix=()):
output = []
self._columns(column_prefix, output, list_indicator)
return output
def select_columns(
self, specifier, expand_braces=True, *, prune_unions_and_records: bool = True
):
if isinstance(specifier, str):
specifier = {specifier}
# Only take unique specifiers
for item in specifier:
if not isinstance(item, str):
raise TypeError(
"a column-selection specifier must be a list of non-empty strings"
)
if not item:
raise ValueError(
"a column-selection specifier must be a list of non-empty strings"
)
if expand_braces:
next_specifier = []
for item in specifier:
for result in _expand_braces(item):
next_specifier.append(result)
specifier = next_specifier
specifier = [[] if item == "" else item.split(".") for item in set(specifier)]
match_specifier = _SpecifierMatcher(specifier, match_if_empty=False)
selection = self._select_columns(match_specifier)
assert selection is not None, "top-level selections always return a Form"
if prune_unions_and_records:
return selection._prune_columns(False)
else:
return selection
def column_types(self):
return self._column_types()
def _columns(self, path, output, list_indicator):
raise NotImplementedError
def _prune_columns(self, is_inside_record_or_union: bool) -> Form | None:
raise NotImplementedError
def _select_columns(self, match_specifier: _SpecifierMatcher) -> Form | None:
raise NotImplementedError
def _column_types(self):
raise NotImplementedError
def _to_dict_part(self, verbose, toplevel):
raise NotImplementedError
def length_zero_array(
self, *, backend=numpy_backend, highlevel=False, behavior=None
):
if highlevel:
raise ValueError(
"The `highlevel=True` variant of `Form.length_zero_array` has been removed. "
"Please use `ak.Array(form.length_zero_array(...), behavior=...)` if an `ak.Array` is required.",
)
return ak.operations.ak_from_buffers._impl(
form=self,
length=0,
container={"": b"\x00\x00\x00\x00\x00\x00\x00\x00"},
buffer_key="",
backend=backend,
byteorder=ak._util.native_byteorder,
highlevel=False,
behavior=behavior,
attrs=None,
simplify=False,
)
def length_one_array(
self, *, backend=numpy_backend, highlevel=False, behavior=None
):
if highlevel:
raise ValueError(
"The `highlevel=True` variant of `Form.length_one_array` has been removed. "
"Please use `ak.Array(form.length_one_array(...), behavior=...)` if an `ak.Array` is required.",
)
# The naive implementation of a length-1 array requires that we have a sufficiently
# large buffer to be able to build _any_ subtree.
def max_prefer_unknown(this: ShapeItem, that: ShapeItem) -> ShapeItem:
if this is unknown_length:
return this
if that is unknown_length:
return that
return max(this, that)
container = {}
def prepare(form, multiplier):
form_key = f"node-{len(container)}"
if isinstance(form, (ak.forms.BitMaskedForm, ak.forms.ByteMaskedForm)):
if form.valid_when:
container[form_key] = b"\x00" * multiplier
else:
container[form_key] = b"\xff" * multiplier
return form.copy(form_key=form_key) # DO NOT RECURSE
elif isinstance(form, ak.forms.IndexedOptionForm):
container[form_key] = b"\xff\xff\xff\xff\xff\xff\xff\xff" # -1
return form.copy(form_key=form_key) # DO NOT RECURSE
elif isinstance(form, ak.forms.EmptyForm):
# no error if protected by non-recursing node type
raise TypeError(
"cannot generate a length_one_array from a Form with an "
"unknowntype that cannot be hidden (EmptyForm not within "
"BitMaskedForm, ByteMaskedForm, or IndexedOptionForm)"
)
elif isinstance(form, ak.forms.UnmaskedForm):
return form.copy(content=prepare(form.content, multiplier))
elif isinstance(form, (ak.forms.IndexedForm, ak.forms.ListForm)):
container[form_key] = b"\x00" * (8 * multiplier)
return form.copy(
content=prepare(form.content, multiplier), form_key=form_key
)
elif isinstance(form, ak.forms.ListOffsetForm):
# offsets length == array length + 1
container[form_key] = b"\x00" * (8 * (multiplier + 1))
return form.copy(
content=prepare(form.content, multiplier), form_key=form_key
)
elif isinstance(form, ak.forms.RegularForm):
size = form.size
# https://github.com/scikit-hep/awkward/pull/2499#discussion_r1220503454
if size is unknown_length:
size = 1
return form.copy(content=prepare(form.content, multiplier * size))
elif isinstance(form, ak.forms.NumpyForm):
dtype = ak.types.numpytype.primitive_to_dtype(form._primitive)
size = multiplier * dtype.itemsize
for x in form.inner_shape:
if x is not unknown_length:
size *= x
container[form_key] = b"\x00" * size
return form.copy(form_key=form_key)
elif isinstance(form, ak.forms.RecordForm):
return form.copy(
# recurse down all contents
contents=[prepare(x, multiplier) for x in form.contents]
)
elif isinstance(form, ak.forms.UnionForm):
# both tags and index will get this buffer, but index is 8 bytes
container[form_key] = b"\x00" * (8 * multiplier)
return form.copy(
# only recurse down contents[0] because all index == 0
contents=(
[prepare(form.contents[0], multiplier)] + form.contents[1:]
),
form_key=form_key,
)
else:
raise AssertionError(f"not a Form: {form!r}")
return ak.operations.ak_from_buffers._impl(
form=prepare(self, 1),
length=1,
container=container,
buffer_key="{form_key}",
backend=backend,
byteorder=ak._util.native_byteorder,
highlevel=False,
behavior=behavior,
attrs=None,
simplify=False,
)
def _expected_from_buffers(
self, getkey: Callable[[Form, str], str], recursive: bool
) -> Iterator[tuple[str, DType]]:
raise NotImplementedError
def expected_from_buffers(
self, buffer_key="{form_key}-{attribute}", recursive=True
):
"""
Args:
buffer_key (str or callable): Python format string containing
`"{form_key}"` and/or `"{attribute}"` or a function that takes these
as keyword arguments and returns a string to use as a key for a buffer
in the `container`.
recursive (bool): If True, recurse into subforms; otherwise, yield
only the (buffer_key, dtype) pairs for this form object.
Yield (buffer_key, dtype) pairs describing the expected buffer keys,
and their corresponding dtypes, that a call to #ak.from_buffers would
be expected to find from the `container` object.
"""
getkey = regularize_buffer_key(buffer_key)
return dict(self._expected_from_buffers(getkey, recursive))
def is_equal_to(
self, other: Any, *, all_parameters: bool = False, form_key: bool = False
) -> bool:
return self._is_equal_to(other, all_parameters, form_key)
__eq__ = is_equal_to
def _is_equal_to(self, other: Any, all_parameters: bool, form_key: bool) -> bool:
raise NotImplementedError
def _is_equal_to_generic(
self, other: Any, all_parameters: bool, form_key: bool
) -> bool:
compare_parameters = (
parameters_are_equal if all_parameters else type_parameters_equal
)
return (
isinstance(other, type(self))
and not (form_key and self._form_key != other._form_key)
and compare_parameters(self._parameters, other._parameters)
)