mirror of
https://github.com/python/cpython
synced 2024-09-05 16:38:56 +00:00
193 lines
6.3 KiB
Python
193 lines
6.3 KiB
Python
"""Redo the builtin repr() (representation) but with limits on most sizes."""
|
|
|
|
__all__ = ["Repr", "repr", "recursive_repr"]
|
|
|
|
import builtins
|
|
from itertools import islice
|
|
from _thread import get_ident
|
|
|
|
def recursive_repr(fillvalue='...'):
|
|
'Decorator to make a repr function return fillvalue for a recursive call'
|
|
|
|
def decorating_function(user_function):
|
|
repr_running = set()
|
|
|
|
def wrapper(self):
|
|
key = id(self), get_ident()
|
|
if key in repr_running:
|
|
return fillvalue
|
|
repr_running.add(key)
|
|
try:
|
|
result = user_function(self)
|
|
finally:
|
|
repr_running.discard(key)
|
|
return result
|
|
|
|
# Can't use functools.wraps() here because of bootstrap issues
|
|
wrapper.__module__ = getattr(user_function, '__module__')
|
|
wrapper.__doc__ = getattr(user_function, '__doc__')
|
|
wrapper.__name__ = getattr(user_function, '__name__')
|
|
wrapper.__qualname__ = getattr(user_function, '__qualname__')
|
|
wrapper.__annotations__ = getattr(user_function, '__annotations__', {})
|
|
return wrapper
|
|
|
|
return decorating_function
|
|
|
|
class Repr:
|
|
|
|
def __init__(
|
|
self, *, maxlevel=6, maxtuple=6, maxlist=6, maxarray=5, maxdict=4,
|
|
maxset=6, maxfrozenset=6, maxdeque=6, maxstring=30, maxlong=40,
|
|
maxother=30, fillvalue='...', indent=None,
|
|
):
|
|
self.maxlevel = maxlevel
|
|
self.maxtuple = maxtuple
|
|
self.maxlist = maxlist
|
|
self.maxarray = maxarray
|
|
self.maxdict = maxdict
|
|
self.maxset = maxset
|
|
self.maxfrozenset = maxfrozenset
|
|
self.maxdeque = maxdeque
|
|
self.maxstring = maxstring
|
|
self.maxlong = maxlong
|
|
self.maxother = maxother
|
|
self.fillvalue = fillvalue
|
|
self.indent = indent
|
|
|
|
def repr(self, x):
|
|
return self.repr1(x, self.maxlevel)
|
|
|
|
def repr1(self, x, level):
|
|
typename = type(x).__name__
|
|
if ' ' in typename:
|
|
parts = typename.split()
|
|
typename = '_'.join(parts)
|
|
if hasattr(self, 'repr_' + typename):
|
|
return getattr(self, 'repr_' + typename)(x, level)
|
|
else:
|
|
return self.repr_instance(x, level)
|
|
|
|
def _join(self, pieces, level):
|
|
if self.indent is None:
|
|
return ', '.join(pieces)
|
|
if not pieces:
|
|
return ''
|
|
indent = self.indent
|
|
if isinstance(indent, int):
|
|
if indent < 0:
|
|
raise ValueError(
|
|
f'Repr.indent cannot be negative int (was {indent!r})'
|
|
)
|
|
indent *= ' '
|
|
try:
|
|
sep = ',\n' + (self.maxlevel - level + 1) * indent
|
|
except TypeError as error:
|
|
raise TypeError(
|
|
f'Repr.indent must be a str, int or None, not {type(indent)}'
|
|
) from error
|
|
return sep.join(('', *pieces, ''))[1:-len(indent) or None]
|
|
|
|
def _repr_iterable(self, x, level, left, right, maxiter, trail=''):
|
|
n = len(x)
|
|
if level <= 0 and n:
|
|
s = self.fillvalue
|
|
else:
|
|
newlevel = level - 1
|
|
repr1 = self.repr1
|
|
pieces = [repr1(elem, newlevel) for elem in islice(x, maxiter)]
|
|
if n > maxiter:
|
|
pieces.append(self.fillvalue)
|
|
s = self._join(pieces, level)
|
|
if n == 1 and trail and self.indent is None:
|
|
right = trail + right
|
|
return '%s%s%s' % (left, s, right)
|
|
|
|
def repr_tuple(self, x, level):
|
|
return self._repr_iterable(x, level, '(', ')', self.maxtuple, ',')
|
|
|
|
def repr_list(self, x, level):
|
|
return self._repr_iterable(x, level, '[', ']', self.maxlist)
|
|
|
|
def repr_array(self, x, level):
|
|
if not x:
|
|
return "array('%s')" % x.typecode
|
|
header = "array('%s', [" % x.typecode
|
|
return self._repr_iterable(x, level, header, '])', self.maxarray)
|
|
|
|
def repr_set(self, x, level):
|
|
if not x:
|
|
return 'set()'
|
|
x = _possibly_sorted(x)
|
|
return self._repr_iterable(x, level, '{', '}', self.maxset)
|
|
|
|
def repr_frozenset(self, x, level):
|
|
if not x:
|
|
return 'frozenset()'
|
|
x = _possibly_sorted(x)
|
|
return self._repr_iterable(x, level, 'frozenset({', '})',
|
|
self.maxfrozenset)
|
|
|
|
def repr_deque(self, x, level):
|
|
return self._repr_iterable(x, level, 'deque([', '])', self.maxdeque)
|
|
|
|
def repr_dict(self, x, level):
|
|
n = len(x)
|
|
if n == 0:
|
|
return '{}'
|
|
if level <= 0:
|
|
return '{' + self.fillvalue + '}'
|
|
newlevel = level - 1
|
|
repr1 = self.repr1
|
|
pieces = []
|
|
for key in islice(_possibly_sorted(x), self.maxdict):
|
|
keyrepr = repr1(key, newlevel)
|
|
valrepr = repr1(x[key], newlevel)
|
|
pieces.append('%s: %s' % (keyrepr, valrepr))
|
|
if n > self.maxdict:
|
|
pieces.append(self.fillvalue)
|
|
s = self._join(pieces, level)
|
|
return '{%s}' % (s,)
|
|
|
|
def repr_str(self, x, level):
|
|
s = builtins.repr(x[:self.maxstring])
|
|
if len(s) > self.maxstring:
|
|
i = max(0, (self.maxstring-3)//2)
|
|
j = max(0, self.maxstring-3-i)
|
|
s = builtins.repr(x[:i] + x[len(x)-j:])
|
|
s = s[:i] + self.fillvalue + s[len(s)-j:]
|
|
return s
|
|
|
|
def repr_int(self, x, level):
|
|
s = builtins.repr(x) # XXX Hope this isn't too slow...
|
|
if len(s) > self.maxlong:
|
|
i = max(0, (self.maxlong-3)//2)
|
|
j = max(0, self.maxlong-3-i)
|
|
s = s[:i] + self.fillvalue + s[len(s)-j:]
|
|
return s
|
|
|
|
def repr_instance(self, x, level):
|
|
try:
|
|
s = builtins.repr(x)
|
|
# Bugs in x.__repr__() can cause arbitrary
|
|
# exceptions -- then make up something
|
|
except Exception:
|
|
return '<%s instance at %#x>' % (x.__class__.__name__, id(x))
|
|
if len(s) > self.maxother:
|
|
i = max(0, (self.maxother-3)//2)
|
|
j = max(0, self.maxother-3-i)
|
|
s = s[:i] + self.fillvalue + s[len(s)-j:]
|
|
return s
|
|
|
|
|
|
def _possibly_sorted(x):
|
|
# Since not all sequences of items can be sorted and comparison
|
|
# functions may raise arbitrary exceptions, return an unsorted
|
|
# sequence in that case.
|
|
try:
|
|
return sorted(x)
|
|
except Exception:
|
|
return list(x)
|
|
|
|
aRepr = Repr()
|
|
repr = aRepr.repr
|