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utils.py
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utils.py
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"""Utils
"""
from __future__ import absolute_import
from ._compat import string_types, iteritems
def _make_callback(callback):
"""Create a callback function from a mixed type `callback`"""
# FIXME: Resolve circular imports
from .collections import pluck, where
if hasattr(callback, '__call__'):
cbk = callback
elif isinstance(callback, string_types):
key = callback
cbk = lambda item, *args: pluck([item], key)[0]
elif isinstance(callback, dict):
cbk = lambda item, *args: where([item], callback)
else:
index = callback if isinstance(callback, int) else 1
cbk = lambda item, i, *args: i < index
return cbk
def _iter_callback(collection, callback=None):
"""Return iterative callback based on collection type."""
if isinstance(collection, dict):
return _iter_dict_callback(collection, callback)
else:
return _iter_list_callback(collection, callback)
def _iter_list_callback(array, callback=None):
"""Return iterative list callback."""
cbk = _make_callback(callback)
for i, item in enumerate(array):
yield (cbk(item, i, array), item, i, array)
def _iter_dict_callback(collection, callback=None):
"""Return iterative dict callback."""
cbk = _make_callback(callback)
for key, value in iteritems(collection):
yield (cbk(value, key, collection),)
def _iter(collection):
"""Return iterative based on collection type."""
if isinstance(collection, dict):
return _iter_dict(collection)
else:
return _iter_list(collection)
def _iter_dict(collection):
"""Return iterative dict."""
return iteritems(collection)
def _iter_list(array):
"""Return iterative list."""
for i, item in enumerate(array):
yield i, item
def _iter_unique_set(array):
"""Return iterator to find unique set."""
seen = set()
seen_add = seen.add
for i, item in enumerate(array):
if item not in seen and not seen_add(item):
yield (i, item)
def _iter_unique(array):
"""Return iterator to find unique list."""
seen = []
for i, item in enumerate(array):
if item not in seen:
seen.append(item)
yield (i, item)