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