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util.py
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util.py
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"""
Various general utilities used in the panel codebase.
"""
from __future__ import absolute_import, division, unicode_literals
import re
import sys
import inspect
import numbers
from collections import defaultdict, MutableSequence, MutableMapping, OrderedDict
from datetime import datetime
from six import string_types
import param
if sys.version_info.major > 2:
unicode = str
def hashable(x):
if isinstance(x, MutableSequence):
return tuple(x)
elif isinstance(x, MutableMapping):
return tuple([(k,v) for k,v in x.items()])
else:
return x
def isIn(obj, objs):
"""
Checks if the object is in the list of objects safely.
"""
for o in objs:
if o is obj:
return True
try:
if o == obj:
return True
except:
pass
return False
def indexOf(obj, objs):
"""
Returns the index of an object in a list of objects. Unlike the
list.index method this function only checks for identity not
equality.
"""
for i, o in enumerate(objs):
if o is obj:
return i
try:
if o == obj:
return i
except:
pass
raise ValueError('%s not in list' % obj)
def as_unicode(obj):
"""
Safely casts any object to unicode including regular string
(i.e. bytes) types in python 2.
"""
if sys.version_info.major < 3 and isinstance(obj, str):
obj = obj.decode('utf-8')
return unicode(obj)
def param_name(name):
"""
Removes the integer id from a Parameterized class name.
"""
match = re.match('(.)+(\d){5}', name)
return name[:-5] if match else name
def unicode_repr(obj):
"""
Returns a repr without the unicode prefix.
"""
if sys.version_info.major == 2 and isinstance(obj, unicode):
return repr(obj)[1:]
return repr(obj)
def abbreviated_repr(value, max_length=25, natural_breaks=(',', ' ')):
"""
Returns an abbreviated repr for the supplied object. Attempts to
find a natural break point while adhering to the maximum length.
"""
vrepr = repr(value)
if len(vrepr) > max_length:
# Attempt to find natural cutoff point
abbrev = vrepr[max_length//2:]
natural_break = None
for brk in natural_breaks:
if brk in abbrev:
natural_break = abbrev.index(brk) + max_length//2
break
if natural_break and natural_break < max_length:
max_length = natural_break + 1
end_char = ''
if isinstance(value, list):
end_char = ']'
elif isinstance(value, OrderedDict):
end_char = '])'
elif isinstance(value, (dict, set)):
end_char = '}'
return vrepr[:max_length+1] + '...' + end_char
return vrepr
def param_reprs(parameterized, skip=[]):
"""
Returns a list of reprs for parameters on the parameterized object.
Skips default and empty values.
"""
cls = type(parameterized).__name__
param_reprs = []
for p, v in sorted(parameterized.get_param_values()):
if v is parameterized.param[p].default: continue
elif v is None: continue
elif isinstance(v, string_types) and v == '': continue
elif isinstance(v, list) and v == []: continue
elif isinstance(v, dict) and v == {}: continue
elif p in skip or (p == 'name' and v.startswith(cls)): continue
param_reprs.append('%s=%s' % (p, abbreviated_repr(v)))
return param_reprs
def full_groupby(l, key=lambda x: x):
"""
Groupby implementation which does not require a prior sort
"""
d = defaultdict(list)
for item in l:
d[key(item)].append(item)
return d.items()
def get_method_owner(meth):
"""
Returns the instance owning the supplied instancemethod or
the class owning the supplied classmethod.
"""
if inspect.ismethod(meth):
if sys.version_info < (3,0):
return meth.im_class if meth.im_self is None else meth.im_self
else:
return meth.__self__
def is_parameterized(obj):
"""
Whether an object is a Parameterized class or instance.
"""
return (isinstance(obj, param.Parameterized) or
(isinstance(obj, type) and issubclass(obj, param.Parameterized)))
def value_as_datetime(value):
"""
Retrieve the value tuple as a tuple of datetime objects.
"""
if isinstance(value, numbers.Number):
value = datetime.utcfromtimestamp(value / 1000)
return value
def value_as_date(value):
if isinstance(value, numbers.Number):
value = datetime.utcfromtimestamp(value / 1000).date()
elif isinstance(value, datetime):
value = value.date()
return value