/
collections.py
1395 lines (1073 loc) · 34 KB
/
collections.py
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# Copyright (c) 2015 Mirantis, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
Functions that produce or consume finite collections - lists, dicts and sets.
"""
import itertools
import six
from yaql.language import specs
from yaql.language import utils
from yaql.language import yaqltypes
import yaql.standard_library.queries
@specs.parameter('args', nullable=True)
@specs.inject('delegate', yaqltypes.Delegate('to_list', method=True))
def list_(delegate, *args):
""":yaql:list
Returns list of provided args and unpacks arg element if it's iterable.
:signature: list([args])
:arg [args]: arguments to create a list
:argType [args]: chain of any types
:returnType: list
.. code::
yaql> list(1, "", range(2))
[1, "", 0, 1]
"""
def rec(seq):
for t in seq:
if utils.is_iterator(t):
for t2 in rec(t):
yield t2
else:
yield t
return delegate(rec(args))
@specs.method
@specs.parameter('collection', yaqltypes.Iterable())
def flatten(collection):
""":yaql:flatten
Returns an iterator to the recursive traversal of collection.
:signature: collection.flatten()
:receiverArg collection: collection to be traversed
:argType collection: iterable
:returnType: list
.. code::
yaql> ["a", ["b", [2,3]]].flatten()
["a", "b", 2, 3]
"""
for t in collection:
if utils.is_iterable(t):
for t2 in flatten(t):
yield t2
else:
yield t
@specs.method
@specs.parameter('collection', yaqltypes.Iterable())
def to_list(collection):
""":yaql:toList
Returns list built from iterable.
:signature: collection.toList()
:receiverArg collection: collection to be transferred to list
:argType collection: iterable
:returnType: list
.. code::
yaql> range(3).toList()
[0, 1, 2]
"""
if isinstance(collection, tuple):
return collection
return tuple(collection)
@specs.parameter('args', nullable=True)
@specs.name('#list')
def build_list(engine, *args):
""":yaql:list
Returns list of provided args.
:signature: list([args])
:arg [args]: arguments to create a list
:argType [args]: any types
:returnType: list
.. code::
yaql> list(1, "", 2)
[1, "", 2]
"""
utils.limit_memory_usage(engine, *((1, t) for t in args))
return tuple(args)
@specs.no_kwargs
@specs.parameter('args', utils.MappingRule)
def dict_(engine, *args):
""":yaql:dict
Returns dictionary of provided keyword values.
:signature: dict([args])
:arg [args]: arguments to create a dictionary
:argType [args]: mappings
:returnType: dictionary
.. code::
yaql> dict(a => 1, b => 2)
{ "a": 1, "b": 2}
"""
utils.limit_memory_usage(engine, *((1, arg) for arg in args))
return utils.FrozenDict((t.source, t.destination) for t in args)
@specs.parameter('items', yaqltypes.Iterable())
@specs.no_kwargs
def dict__(items, engine):
""":yaql:dict
Returns dictionary with keys and values built on items pairs.
:signature: dict(items)
:arg items: list of pairs [key, value] for building dictionary
:argType items: list
:returnType: dictionary
.. code::
yaql> dict([["a", 2], ["b", 4]])
{"a": 2, "b": 4}
"""
result = {}
for t in items:
it = iter(t)
key = next(it)
value = next(it)
result[key] = value
utils.limit_memory_usage(engine, (1, result))
return utils.FrozenDict(result)
@specs.parameter('collection', yaqltypes.Iterable())
@specs.parameter('key_selector', yaqltypes.Lambda())
@specs.parameter('value_selector', yaqltypes.Lambda())
@specs.method
def to_dict(collection, engine, key_selector, value_selector=None):
""":yaql:dict
Returns dict built on collection where keys are keySelector applied to
collection elements and values are valueSelector applied to collection
elements.
:signature: collection.toDict(keySelector, valueSelector => null)
:receiverArg collection: collection to build dict from
:argType collection: iterable
:arg keySelector: lambda function to get keys from collection elements
:argType keySelector: lambda
:arg valueSelector: lambda function to get values from collection elements.
null by default, which means values to be collection items
:argType valueSelector: lambda
:returnType: dictionary
.. code::
yaql> [1, 2].toDict($, $ + 1)
{"1": 2, "2": 3}
"""
result = {}
for t in collection:
key = key_selector(t)
value = t if value_selector is None else value_selector(t)
result[key] = value
utils.limit_memory_usage(engine, (1, result))
return result
@specs.parameter('d', utils.MappingType, alias='dict')
@specs.parameter('key', yaqltypes.Keyword())
@specs.name('#operator_.')
def dict_keyword_access(d, key):
""":yaql:operator .
Returns value of a dictionary by given key.
:signature: left.right
:arg left: input dictionary
:argType left: dictionary
:arg right: key
:argType right: keyword
:returnType: any (appropriate value type)
.. code::
yaql> {"a" => 1, "b" => 2}.a
1
"""
return d[key]
@specs.parameter('d', utils.MappingType, alias='dict')
@specs.name('#indexer')
def dict_indexer(d, key):
""":yaql:operator indexer
Returns value of a dictionary by given key.
:signature: left[right]
:arg left: input dictionary
:argType left: dictionary
:arg right: key
:argType right: keyword
:returnType: any (appropriate value type)
.. code::
yaql> {"a" => 1, "b" => 2}["a"]
1
"""
return d[key]
@specs.parameter('d', utils.MappingType, alias='dict')
@specs.name('#indexer')
def dict_indexer_with_default(d, key, default):
""":yaql:operator indexer
Returns value of a dictionary by given key or default if there is
no such key.
:signature: left[right, default]
:arg left: input dictionary
:argType left: dictionary
:arg right: key
:argType right: keyword
:arg default: default value to be returned if key is missing in dictionary
:argType default: any
:returnType: any (appropriate value type)
.. code::
yaql> {"a" => 1, "b" => 2}["c", 3]
3
"""
return d.get(key, default)
@specs.parameter('d', utils.MappingType, alias='dict')
@specs.name('get')
@specs.method
def dict_get(d, key, default=None):
""":yaql:get
Returns value of a dictionary by given key or default if there is
no such key.
:signature: dict.get(key, default => null)
:receiverArg dict: input dictionary
:argType dict: dictionary
:arg key: key
:argType key: keyword
:arg default: default value to be returned if key is missing in dictionary.
null by default
:argType default: any
:returnType: any (appropriate value type)
.. code::
yaql> {"a" => 1, "b" => 2}.get("c")
null
yaql> {"a" => 1, "b" => 2}.get("c", 3)
3
"""
return d.get(key, default)
@specs.parameter('d', utils.MappingType, alias='dict')
@specs.name('set')
@specs.method
@specs.no_kwargs
def dict_set(engine, d, key, value):
""":yaql:set
Returns dict with provided key set to value.
:signature: dict.set(key, value)
:receiverArg dict: input dictionary
:argType dict: dictionary
:arg key: key
:argType key: keyword
:arg value: value to be set to input key
:argType value: any
:returnType: dictionary
.. code::
yaql> {"a" => 1, "b" => 2}.set("c", 3)
{"a": 1, "b": 2, "c": 3}
yaql> {"a" => 1, "b" => 2}.set("b", 3)
{"a": 1, "b": 3}
"""
utils.limit_memory_usage(engine, (1, d), (1, key), (1, value))
return utils.FrozenDict(itertools.chain(six.iteritems(d), ((key, value),)))
@specs.parameter('d', utils.MappingType, alias='dict')
@specs.parameter('replacements', utils.MappingType)
@specs.name('set')
@specs.method
@specs.no_kwargs
def dict_set_many(engine, d, replacements):
""":yaql:set
Returns dict with replacements keys set to replacements values.
:signature: dict.set(replacements)
:receiverArg dict: input dictionary
:argType dict: dictionary
:arg replacements: mapping with keys and values to be set on input dict
:argType key: dictionary
:returnType: dictionary
.. code::
yaql> {"a" => 1, "b" => 2}.set({"b" => 3, "c" => 4})
{"a": 1, "c": 4, "b": 3}
"""
utils.limit_memory_usage(engine, (1, d), (1, replacements))
return utils.FrozenDict(itertools.chain(
six.iteritems(d), six.iteritems(replacements)))
@specs.no_kwargs
@specs.method
@specs.parameter('args', utils.MappingRule)
@specs.parameter('d', utils.MappingType, alias='dict')
@specs.name('set')
def dict_set_many_inline(engine, d, *args):
""":yaql:set
Returns dict with args keys set to args values.
:signature: dict.set([args])
:receiverArg dict: input dictionary
:argType dict: dictionary
:arg [args]: key-values to be set on input dict
:argType [args]: chain of mappings
:returnType: dictionary
.. code::
yaql> {"a" => 1, "b" => 2}.set("b" => 3, "c" => 4)
{"a": 1, "c": 4, "b": 3}
"""
utils.limit_memory_usage(engine, (1, d), *((1, arg) for arg in args))
return utils.FrozenDict(itertools.chain(
six.iteritems(d), ((t.source, t.destination) for t in args)))
@specs.parameter('d', utils.MappingType, alias='dict')
@specs.name('keys')
@specs.method
def dict_keys(d):
""":yaql:keys
Returns an iterator over the dictionary keys.
:signature: dict.keys()
:receiverArg dict: input dictionary
:argType dict: dictionary
:returnType: iterator
.. code::
yaql> {"a" => 1, "b" => 2}.keys()
["a", "b"]
"""
return six.iterkeys(d)
@specs.parameter('d', utils.MappingType, alias='dict')
@specs.name('values')
@specs.method
def dict_values(d):
""":yaql:values
Returns an iterator over the dictionary values.
:signature: dict.values()
:receiverArg dict: input dictionary
:argType dict: dictionary
:returnType: iterator
.. code::
yaql> {"a" => 1, "b" => 2}.values()
[1, 2]
"""
return six.itervalues(d)
@specs.parameter('d', utils.MappingType, alias='dict')
@specs.name('items')
@specs.method
def dict_items(d):
""":yaql:items
Returns an iterator over pairs [key, value] of input dict.
:signature: dict.items()
:receiverArg dict: input dictionary
:argType dict: dictionary
:returnType: iterator
.. code::
yaql> {"a" => 1, "b" => 2}.items()
[["a", 1], ["b", 2]]
"""
return six.iteritems(d)
@specs.parameter('lst', yaqltypes.Sequence(), alias='list')
@specs.parameter('index', int, nullable=False)
@specs.name('#indexer')
def list_indexer(lst, index):
""":yaql:operator indexer
Returns value of sequence by given index.
:signature: left[right]
:arg left: input sequence
:argType left: sequence
:arg right: index
:argType right: integer
:returnType: any (appropriate value type)
.. code::
yaql> ["a", "b"][0]
"a"
"""
return lst[index]
@specs.parameter('value', nullable=True)
@specs.parameter('collection', yaqltypes.Iterable())
@specs.name('#operator_in')
def in_(value, collection):
""":yaql:operator in
Returns true if there is at least one occurrence of value in collection,
false otherwise.
:signature: left in right
:arg left: value to be checked for occurrence
:argType left: any
:arg right: collection to find occurrence in
:argType right: iterable
:returnType: boolean
.. code::
yaql> "a" in ["a", "b"]
true
"""
return value in collection
@specs.parameter('value', nullable=True)
@specs.parameter('collection', yaqltypes.Iterable())
@specs.method
def contains(collection, value):
""":yaql:contains
Returns true if value is contained in collection, false otherwise.
:signature: collection.contains(value)
:receiverArg collection: collection to find occurrence in
:argType collection: iterable
:arg value: value to be checked for occurrence
:argType value: any
:returnType: boolean
.. code::
yaql> ["a", "b"].contains("a")
true
"""
return value in collection
@specs.parameter('key', nullable=True)
@specs.parameter('d', utils.MappingType, alias='dict')
@specs.method
def contains_key(d, key):
""":yaql:containsKey
Returns true if the dictionary contains the key, false otherwise.
:signature: dict.containsKey(key)
:receiverArg dict: dictionary to find occurrence in
:argType dict: mapping
:arg key: value to be checked for occurrence
:argType key: any
:returnType: boolean
.. code::
yaql> {"a" => 1, "b" => 2}.containsKey("a")
true
"""
return key in d
@specs.parameter('value', nullable=True)
@specs.parameter('d', utils.MappingType, alias='dict')
@specs.method
def contains_value(d, value):
""":yaql:containsValue
Returns true if the dictionary contains the value, false otherwise.
:signature: dict.containsValue(value)
:receiverArg dict: dictionary to find occurrence in
:argType dict: mapping
:arg value: value to be checked for occurrence
:argType value: any
:returnType: boolean
.. code::
yaql> {"a" => 1, "b" => 2}.containsValue("a")
false
yaql> {"a" => 1, "b" => 2}.containsValue(2)
true
"""
return value in six.itervalues(d)
@specs.parameter('left', yaqltypes.Iterable())
@specs.parameter('right', yaqltypes.Iterable())
@specs.name('#operator_+')
def combine_lists(left, right, engine):
""":yaql:operator +
Returns two iterables concatenated.
:signature: left + right
:arg left: left list
:argType left: iterable
:arg right: right list
:argType right: iterable
:returnType: iterable
.. code::
yaql> [1, 2] + [3]
[1, 2, 3]
"""
if isinstance(left, tuple) and isinstance(right, tuple):
utils.limit_memory_usage(engine, (1, left), (1, right))
return left + right
elif isinstance(left, frozenset) and isinstance(right, frozenset):
utils.limit_memory_usage(engine, (1, left), (1, right))
return left.union(right)
return yaql.standard_library.queries.concat(left, right)
@specs.parameter('left', yaqltypes.Sequence())
@specs.parameter('right', int)
@specs.name('#operator_*')
def list_by_int(left, right, engine):
""":yaql:operator *
Returns sequence repeated count times.
:signature: left * right
:arg left: input sequence
:argType left: sequence
:arg right: multiplier
:argType right: integer
:returnType: sequence
.. code::
yaql> [1, 2] * 2
[1, 2, 1, 2]
"""
utils.limit_memory_usage(engine, (-right + 1, []), (right, left))
return left * right
@specs.parameter('left', int)
@specs.parameter('right', yaqltypes.Sequence())
@specs.name('#operator_*')
def int_by_list(left, right, engine):
""":yaql:operator *
Returns sequence repeated count times.
:signature: left * right
:arg left: multiplier
:argType left: integer
:arg right: input sequence
:argType right: sequence
:returnType: sequence
.. code::
yaql> 2 * [1, 2]
[1, 2, 1, 2]
"""
return list_by_int(right, left, engine)
@specs.parameter('left', utils.MappingType)
@specs.parameter('right', utils.MappingType)
@specs.name('#operator_+')
def combine_dicts(left, right, engine):
""":yaql:operator +
Returns combined left and right dictionaries.
:signature: left + right
:arg left: left dictionary
:argType left: mapping
:arg right: right dictionary
:argType right: mapping
:returnType: mapping
.. code::
yaql> {"a" => 1, b => 2} + {"b" => 3, "c" => 4}
{"a": 1, "c": 4, "b": 3}
"""
utils.limit_memory_usage(engine, (1, left), (1, right))
d = dict(left)
d.update(right)
return utils.FrozenDict(d)
def is_list(arg):
""":yaql:isList
Returns true if arg is a list, false otherwise.
:signature: isList(arg)
:arg arg: value to be checked
:argType arg: any
:returnType: boolean
.. code::
yaql> isList([1, 2])
true
yaql> isList({"a" => 1})
false
"""
return utils.is_sequence(arg)
def is_dict(arg):
""":yaql:isDict
Returns true if arg is dictionary, false otherwise.
:signature: isDict(arg)
:arg arg: value to be checked
:argType arg: any
:returnType: boolean
.. code::
yaql> isDict([1, 2])
false
yaql> isDict({"a" => 1})
true
"""
return isinstance(arg, utils.MappingType)
def is_set(arg):
""":yaql:isSet
Returns true if arg is set, false otherwise.
:signature: isSet(arg)
:arg arg: value to be checked
:argType arg: any
:returnType: boolean
.. code::
yaql> isSet({"a" => 1})
false
yaql> isSet(set(1, 2))
true
"""
return isinstance(arg, utils.SetType)
@specs.parameter('d', utils.MappingType, alias='dict')
@specs.extension_method
@specs.name('len')
def dict_len(d):
""":yaql:len
Returns size of the dictionary.
:signature: dict.len()
:receiverArg dict: input dictionary
:argType dict: mapping
:returnType: integer
.. code::
yaql> {"a" => 1, "b" => 2}.len()
2
"""
return len(d)
@specs.parameter('sequence', yaqltypes.Sequence())
@specs.extension_method
@specs.name('len')
def sequence_len(sequence):
""":yaql:len
Returns length of the list.
:signature: sequence.len()
:receiverArg sequence: input sequence
:argType dict: sequence
:returnType: integer
.. code::
yaql> [0, 1, 2].len()
3
"""
return len(sequence)
@specs.method
@specs.parameter('collection', yaqltypes.Iterable())
@specs.parameter('position', int)
@specs.parameter('count', int)
def delete(collection, position, count=1):
""":yaql:delete
Returns collection with removed [position, position+count) elements.
:signature: collection.delete(position, count => 1)
:receiverArg collection: input collection
:argType collection: iterable
:arg position: index to start remove
:argType position: integer
:arg count: how many elements to remove, 1 by default
:argType position: integer
:returnType: iterable
.. code::
yaql> [0, 1, 3, 4, 2].delete(2, 2)
[0, 1, 2]
"""
for i, t in enumerate(collection):
if count >= 0 and not position <= i < position + count:
yield t
elif count < 0 and not i >= position:
yield t
@specs.method
@specs.parameter('collection', yaqltypes.Iterable())
@specs.parameter('position', int)
@specs.parameter('count', int)
def replace(collection, position, value, count=1):
""":yaql:replace
Returns collection where [position, position+count) elements are replaced
with value.
:signature: collection.replace(position, value, count => 1)
:receiverArg collection: input collection
:argType collection: iterable
:arg position: index to start replace
:argType position: integer
:arg value: value to be replaced with
:argType value: any
:arg count: how many elements to replace, 1 by default
:argType count: integer
:returnType: iterable
.. code::
yaql> [0, 1, 3, 4, 2].replace(2, 100, 2)
[0, 1, 100, 2]
"""
yielded = False
for i, t in enumerate(collection):
if (count >= 0 and position <= i < position + count
or count < 0 and i >= position):
if not yielded:
yielded = True
yield value
else:
yield t
@specs.method
@specs.parameter('collection', yaqltypes.Iterable())
@specs.parameter('position', int)
@specs.parameter('count', int)
@specs.parameter('values', yaqltypes.Iterable())
def replace_many(collection, position, values, count=1):
""":yaql:replaceMany
Returns collection where [position, position+count) elements are replaced
with values items.
:signature: collection.replaceMany(position, values, count => 1)
:receiverArg collection: input collection
:argType collection: iterable
:arg position: index to start replace
:argType position: integer
:arg values: items to replace
:argType values: iterable
:arg count: how many elements to replace, 1 by default
:argType count: integer
:returnType: iterable
.. code::
yaql> [0, 1, 3, 4, 2].replaceMany(2, [100, 200], 2)
[0, 1, 100, 200, 2]
"""
yielded = False
for i, t in enumerate(collection):
if (count >= 0 and position <= i < position + count
or count < 0 and i >= position):
if not yielded:
for v in values:
yield v
yielded = True
else:
yield t
@specs.method
@specs.name('delete')
@specs.parameter('d', utils.MappingType, alias='dict')
def delete_keys(d, *keys):
""":yaql:delete
Returns dict with keys removed.
:signature: dict.delete([args])
:receiverArg dict: input dictionary
:argType dict: mapping
:arg [args]: keys to be removed from dictionary
:argType [args]: chain of keywords
:returnType: mapping
.. code::
yaql> {"a" => 1, "b" => 2, "c" => 3}.delete("a", "c")
{"b": 2}
"""
return delete_keys_seq(d, keys)
@specs.method
@specs.name('deleteAll')
@specs.parameter('d', utils.MappingType, alias='dict')
@specs.parameter('keys', yaqltypes.Iterable())
def delete_keys_seq(d, keys):
""":yaql:deleteAll
Returns dict with keys removed. Keys are provided as an iterable
collection.
:signature: dict.deleteAll(keys)
:receiverArg dict: input dictionary
:argType dict: mapping
:arg keys: keys to be removed from dictionary
:argType keys: iterable
:returnType: mapping
.. code::
yaql> {"a" => 1, "b" => 2, "c" => 3}.deleteAll(["a", "c"])
{"b": 2}
"""
copy = dict(d)
for t in keys:
copy.pop(t, None)
return copy
@specs.method
@specs.parameter('collection', yaqltypes.Iterable(validators=[
lambda x: not isinstance(x, utils.SetType)]
))
@specs.parameter('value', nullable=True)
@specs.parameter('position', int)
@specs.name('insert')
def iter_insert(collection, position, value):
""":yaql:insert
Returns collection with inserted value at the given position.
:signature: collection.insert(position, value)
:receiverArg collection: input collection
:argType collection: iterable
:arg position: index for insertion. value is inserted in the end if
position greater than collection size
:argType position: integer
:arg value: value to be inserted
:argType value: any
:returnType: iterable
.. code::
yaql> [0, 1, 3].insert(2, 2)
[0, 1, 2, 3]
"""
i = -1
for i, t in enumerate(collection):
if i == position:
yield value
yield t
if position > i:
yield value
@specs.method
@specs.parameter('collection', yaqltypes.Sequence())
@specs.parameter('value', nullable=True)
@specs.parameter('position', int)
@specs.name('insert')
def list_insert(collection, position, value):
""":yaql:insert
Returns collection with inserted value at the given position.
:signature: collection.insert(position, value)
:receiverArg collection: input collection
:argType collection: sequence
:arg position: index for insertion. value is inserted in the end if
position greater than collection size
:argType position: integer
:arg value: value to be inserted
:argType value: any
:returnType: sequence
.. code::
yaql> [0, 1, 3].insert(2, 2)
[0, 1, 2, 3]
"""
copy = list(collection)
copy.insert(position, value)
return copy
@specs.method
@specs.parameter('collection', yaqltypes.Iterable())